feat(initial): add comprehensive PDF to JPEG preview library with dual-environment support
- Add Node.js implementation using @push.rocks/smartpdf - Add browser implementation with PDF.js and Web Workers - Support configurable quality, dimensions, and page selection - Include comprehensive TypeScript definitions and error handling - Provide extensive test coverage for both environments - Add download functionality and browser compatibility checking
This commit is contained in:
112
.gitignore
vendored
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112
.gitignore
vendored
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@@ -0,0 +1,112 @@
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# Dependencies
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||||
node_modules/
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npm-debug.log*
|
||||
yarn-debug.log*
|
||||
yarn-error.log*
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||||
pnpm-debug.log*
|
||||
|
||||
# Build outputs
|
||||
dist/
|
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dist_ts/
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||||
dist_ts_web/
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||||
build/
|
||||
*.tsbuildinfo
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||||
|
||||
# Runtime data
|
||||
pids
|
||||
*.pid
|
||||
*.seed
|
||||
*.pid.lock
|
||||
|
||||
# Coverage directory used by tools like istanbul
|
||||
coverage/
|
||||
*.lcov
|
||||
|
||||
# nyc test coverage
|
||||
.nyc_output
|
||||
|
||||
# Grunt intermediate storage
|
||||
.grunt
|
||||
|
||||
# Bower dependency directory
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||||
bower_components
|
||||
|
||||
# node-waf configuration
|
||||
.lock-wscript
|
||||
|
||||
# Compiled binary addons
|
||||
build/Release
|
||||
|
||||
# Dependency directories
|
||||
jspm_packages/
|
||||
|
||||
# TypeScript cache
|
||||
*.tsbuildinfo
|
||||
|
||||
# Optional npm cache directory
|
||||
.npm
|
||||
|
||||
# Optional eslint cache
|
||||
.eslintcache
|
||||
|
||||
# Optional REPL history
|
||||
.node_repl_history
|
||||
|
||||
# Output of 'npm pack'
|
||||
*.tgz
|
||||
|
||||
# Yarn Integrity file
|
||||
.yarn-integrity
|
||||
|
||||
# dotenv environment variables file
|
||||
.env
|
||||
.env.local
|
||||
.env.development.local
|
||||
.env.test.local
|
||||
.env.production.local
|
||||
|
||||
# parcel-bundler cache
|
||||
.cache
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||||
.parcel-cache
|
||||
|
||||
# Next.js build output
|
||||
.next
|
||||
|
||||
# Nuxt.js build / generate output
|
||||
.nuxt
|
||||
dist
|
||||
|
||||
# Gatsby files
|
||||
.cache/
|
||||
public
|
||||
|
||||
# Storybook build outputs
|
||||
.out
|
||||
.storybook-out
|
||||
|
||||
# Temporary folders
|
||||
tmp/
|
||||
temp/
|
||||
|
||||
# Logs
|
||||
logs
|
||||
*.log
|
||||
|
||||
# OS generated files
|
||||
.DS_Store
|
||||
.DS_Store?
|
||||
._*
|
||||
.Spotlight-V100
|
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.Trashes
|
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ehthumbs.db
|
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Thumbs.db
|
||||
|
||||
# IDE
|
||||
.vscode/settings.json
|
||||
.idea/
|
||||
*.swp
|
||||
*.swo
|
||||
*~
|
||||
|
||||
# Test artifacts
|
||||
.nogit/
|
||||
10
.vscode/extensions.json
vendored
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10
.vscode/extensions.json
vendored
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{
|
||||
"recommendations": [
|
||||
"ms-vscode.vscode-typescript-next",
|
||||
"esbenp.prettier-vscode",
|
||||
"ms-vscode.vscode-json",
|
||||
"ms-vscode.test-adapter-converter",
|
||||
"hbenl.vscode-test-explorer",
|
||||
"GitMoji.gitmoji-vscode"
|
||||
]
|
||||
}
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||||
45
.vscode/launch.json
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45
.vscode/launch.json
vendored
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{
|
||||
"version": "0.2.0",
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"configurations": [
|
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{
|
||||
"name": "Debug Node.js Tests",
|
||||
"type": "node",
|
||||
"request": "launch",
|
||||
"program": "${workspaceFolder}/node_modules/.bin/tstest",
|
||||
"args": ["test/test.node.ts", "--verbose"],
|
||||
"console": "integratedTerminal",
|
||||
"internalConsoleOptions": "neverOpen",
|
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"skipFiles": ["<node_internals>/**"]
|
||||
},
|
||||
{
|
||||
"name": "Debug Browser Tests",
|
||||
"type": "node",
|
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"request": "launch",
|
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"program": "${workspaceFolder}/node_modules/.bin/tstest",
|
||||
"args": ["test/test.browser.ts", "--web", "--verbose"],
|
||||
"console": "integratedTerminal",
|
||||
"internalConsoleOptions": "neverOpen",
|
||||
"skipFiles": ["<node_internals>/**"]
|
||||
},
|
||||
{
|
||||
"name": "Debug Both Tests",
|
||||
"type": "node",
|
||||
"request": "launch",
|
||||
"program": "${workspaceFolder}/node_modules/.bin/tstest",
|
||||
"args": ["test/test.both.ts", "--verbose"],
|
||||
"console": "integratedTerminal",
|
||||
"internalConsoleOptions": "neverOpen",
|
||||
"skipFiles": ["<node_internals>/**"]
|
||||
},
|
||||
{
|
||||
"name": "Debug All Tests",
|
||||
"type": "node",
|
||||
"request": "launch",
|
||||
"program": "${workspaceFolder}/node_modules/.bin/tstest",
|
||||
"args": ["test/", "--web", "--verbose"],
|
||||
"console": "integratedTerminal",
|
||||
"internalConsoleOptions": "neverOpen",
|
||||
"skipFiles": ["<node_internals>/**"]
|
||||
}
|
||||
]
|
||||
}
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34
changelog.md
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changelog.md
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# Changelog
|
||||
|
||||
All notable changes to this project will be documented in this file.
|
||||
|
||||
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
|
||||
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
|
||||
|
||||
## [1.0.0] - 2024-08-03
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||||
### Added
|
||||
- Initial release of @push.rocks/smartpreview
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||||
- Dual environment support for Node.js and browsers
|
||||
- PDF to JPEG preview generation with configurable quality and dimensions
|
||||
- Web Worker-based processing for non-blocking browser operations
|
||||
- TypeScript-first design with comprehensive type definitions
|
||||
- Extensible architecture ready for additional formats
|
||||
- Comprehensive error handling with typed error system
|
||||
- Factory method pattern for easy instantiation
|
||||
- Browser compatibility checking utilities
|
||||
- File download functionality for web environments
|
||||
- Multi-page PDF preview support
|
||||
- Progress callback support for web environments
|
||||
- Complete test suite covering both environments
|
||||
|
||||
### Features
|
||||
- **Node.js Implementation**: Uses @push.rocks/smartpdf for server-side PDF processing
|
||||
- **Browser Implementation**: PDF.js integration with Web Workers for client-side processing
|
||||
- **Configuration Options**: Quality (1-100), dimensions, page selection, and scaling
|
||||
- **Error Handling**: Detailed error types including PDF_CORRUPTED, PAGE_NOT_FOUND, WORKER_ERROR
|
||||
- **Cross-Platform**: Single API works in Node.js, browsers, and edge functions
|
||||
- **Type Safety**: Full TypeScript support prevents runtime errors
|
||||
- **Performance**: Optimized for high-volume production use
|
||||
|
||||
[1.0.0]: https://code.foss.global/push.rocks/smartpreview/releases/tag/v1.0.0
|
||||
21
license.md
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21
license.md
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|
||||
# MIT License
|
||||
|
||||
Copyright (C) 2024 Task Venture Capital GmbH
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
13
npmextra.json
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13
npmextra.json
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|
||||
{
|
||||
"githost": "code.foss.global",
|
||||
"gitscope": "push.rocks",
|
||||
"gitrepo": "smartpreview",
|
||||
"shortDescription": "A library for generating efficient JPEG previews from PDFs",
|
||||
"npmAccessLevel": "public",
|
||||
"npmRegistries": [
|
||||
"npmjs"
|
||||
],
|
||||
"tsdoc": {
|
||||
"legal": "\n## License and Legal Information\n\nThis repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository. \n\n**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.\n\n### Trademarks\n\nThis project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.\n\n### Company Information\n\nTask Venture Capital GmbH \nRegistered at District court Bremen HRB 35230 HB, Germany\n\nFor any legal inquiries or if you require different licensing, please contact: legal@task.vc\n"
|
||||
}
|
||||
}
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||||
54
package.json
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54
package.json
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||||
{
|
||||
"name": "@push.rocks/smartpreview",
|
||||
"version": "1.0.0",
|
||||
"private": false,
|
||||
"description": "A library for generating efficient JPEG previews from PDFs with support for Node.js and browser environments",
|
||||
"main": "dist_ts/index.js",
|
||||
"typings": "dist_ts/index.d.ts",
|
||||
"type": "module",
|
||||
"exports": {
|
||||
".": "./dist_ts/index.js",
|
||||
"./web": "./dist_ts_web/index.js"
|
||||
},
|
||||
"scripts": {
|
||||
"test": "(tstest test/ --web)",
|
||||
"build": "(tsbuild tsfolders --allowimplicitany)",
|
||||
"buildDocs": "tsdoc"
|
||||
},
|
||||
"repository": {
|
||||
"type": "git",
|
||||
"url": "https://code.foss.global/push.rocks/smartpreview.git"
|
||||
},
|
||||
"keywords": [
|
||||
"pdf",
|
||||
"preview",
|
||||
"jpeg",
|
||||
"image",
|
||||
"conversion",
|
||||
"nodejs",
|
||||
"browser",
|
||||
"pdfjs",
|
||||
"worker"
|
||||
],
|
||||
"author": "Lossless GmbH",
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"@push.rocks/smartpdf": "^4.0.0",
|
||||
"@push.rocks/smartenv": "^5.0.5",
|
||||
"@push.rocks/smartjson": "^5.0.10",
|
||||
"@push.rocks/smartpromise": "^4.0.3"
|
||||
},
|
||||
"devDependencies": {
|
||||
"@git.zone/tsbuild": "^2.1.70",
|
||||
"@git.zone/tsrun": "^1.2.46",
|
||||
"@git.zone/tstest": "^1.0.81",
|
||||
"@types/node": "^20.6.3"
|
||||
},
|
||||
"engines": {
|
||||
"node": ">=16"
|
||||
},
|
||||
"browserslist": [
|
||||
"last 1 Chrome version"
|
||||
],
|
||||
"packageManager": "pnpm@10.11.0+sha512.6540583f41cc5f628eb3d9773ecee802f4f9ef9923cc45b69890fb47991d4b092964694ec3a4f738a420c918a333062c8b925d312f42e4f0c263eb603551f977"
|
||||
}
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||||
10037
pnpm-lock.yaml
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10037
pnpm-lock.yaml
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pnpm-workspace.yaml
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pnpm-workspace.yaml
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onlyBuiltDependencies:
|
||||
- esbuild
|
||||
- mongodb-memory-server
|
||||
- puppeteer
|
||||
- sharp
|
||||
466
readme.md
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readme.md
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||||
# @push.rocks/smartpreview 🖼️
|
||||
|
||||
> **Lightning-fast PDF to JPEG preview generation for Node.js and browsers** ⚡
|
||||
|
||||
Transform your PDFs into beautiful JPEG previews with zero hassle. Whether you're building a document viewer, thumbnail generator, or file management system, SmartPreview delivers high-quality results in both server and browser environments.
|
||||
|
||||
[](https://www.npmjs.com/package/@push.rocks/smartpreview)
|
||||
|
||||
## ✨ Features
|
||||
|
||||
- 🌐 **Universal**: Works seamlessly in Node.js and browsers
|
||||
- ⚡ **Fast**: Web Worker-based processing for non-blocking operations
|
||||
- 🎯 **Precise**: Configurable quality, dimensions, and page selection
|
||||
- 🛡️ **Type-Safe**: Full TypeScript support with comprehensive type definitions
|
||||
- 🔧 **Extensible**: Built to support additional formats in the future
|
||||
- 📦 **Zero Config**: Works out of the box with sensible defaults
|
||||
- 🎨 **High Quality**: Professional-grade JPEG output with customizable compression
|
||||
|
||||
## 🚀 Quick Start
|
||||
|
||||
### Installation
|
||||
|
||||
```bash
|
||||
# Using pnpm (recommended)
|
||||
pnpm install @push.rocks/smartpreview
|
||||
|
||||
# Using npm
|
||||
npm install @push.rocks/smartpreview
|
||||
|
||||
# Using yarn
|
||||
yarn add @push.rocks/smartpreview
|
||||
```
|
||||
|
||||
### Node.js Usage
|
||||
|
||||
Perfect for server-side processing, APIs, and build tools:
|
||||
|
||||
```typescript
|
||||
import { SmartPreview } from '@push.rocks/smartpreview';
|
||||
|
||||
// Initialize the preview generator
|
||||
const preview = await SmartPreview.create();
|
||||
|
||||
// Generate preview from PDF buffer
|
||||
const result = await preview.generatePreview(pdfBuffer, {
|
||||
quality: 85,
|
||||
width: 1200,
|
||||
height: 800,
|
||||
page: 1,
|
||||
});
|
||||
|
||||
// result.buffer contains the JPEG data
|
||||
console.log(
|
||||
`Generated ${result.size} byte preview: ${result.dimensions.width}x${result.dimensions.height}`
|
||||
);
|
||||
|
||||
// Don't forget to cleanup
|
||||
await preview.cleanup();
|
||||
```
|
||||
|
||||
### Browser Usage
|
||||
|
||||
Ideal for web applications, file uploads, and client-side processing:
|
||||
|
||||
```typescript
|
||||
import { SmartPreview } from '@push.rocks/smartpreview/web';
|
||||
|
||||
// Initialize with progress tracking
|
||||
const preview = await SmartPreview.create();
|
||||
|
||||
// Generate preview from file input
|
||||
const fileInput = document.querySelector('input[type="file"]');
|
||||
const file = fileInput.files[0];
|
||||
|
||||
const result = await preview.generatePreview(file, {
|
||||
quality: 80,
|
||||
width: 800,
|
||||
height: 600,
|
||||
onProgress: (progress, stage) => {
|
||||
console.log(`${stage}: ${progress}%`);
|
||||
},
|
||||
});
|
||||
|
||||
// Use the result
|
||||
const img = document.createElement('img');
|
||||
img.src = result.dataUrl; // Ready-to-use data URL
|
||||
document.body.appendChild(img);
|
||||
|
||||
// Or create a download link
|
||||
const { url, cleanup } = await preview.createDownloadLink(file, {}, 'preview.jpg');
|
||||
// Use url for download, call cleanup() when done
|
||||
```
|
||||
|
||||
## 📚 API Reference
|
||||
|
||||
### Node.js API
|
||||
|
||||
#### `SmartPreview`
|
||||
|
||||
The main class for Node.js environments.
|
||||
|
||||
##### Methods
|
||||
|
||||
```typescript
|
||||
// Factory method (recommended)
|
||||
static async create(options?: IPreviewOptions): Promise<SmartPreview>
|
||||
|
||||
// Manual initialization
|
||||
async init(): Promise<void>
|
||||
async cleanup(): Promise<void>
|
||||
|
||||
// Preview generation
|
||||
async generatePreview(buffer: Buffer, options?: IPreviewOptions): Promise<IPreviewResult>
|
||||
async generatePreviewFromFile(filePath: string, options?: IPreviewOptions): Promise<IPreviewResult>
|
||||
|
||||
// Save directly to file
|
||||
async savePreview(buffer: Buffer, outputPath: string, options?: IPreviewOptions): Promise<void>
|
||||
|
||||
// Utility methods
|
||||
getSupportedFormats(): string[]
|
||||
isFormatSupported(format: string): boolean
|
||||
```
|
||||
|
||||
##### Node.js Result
|
||||
|
||||
```typescript
|
||||
interface IPreviewResult {
|
||||
buffer: Buffer; // JPEG image data
|
||||
dimensions: {
|
||||
// Actual dimensions
|
||||
width: number;
|
||||
height: number;
|
||||
};
|
||||
size: number; // File size in bytes
|
||||
mimeType: 'image/jpeg'; // Always JPEG
|
||||
}
|
||||
```
|
||||
|
||||
### Browser API
|
||||
|
||||
#### `SmartPreview`
|
||||
|
||||
The main class for browser environments with additional web-specific features.
|
||||
|
||||
##### Methods
|
||||
|
||||
```typescript
|
||||
// Factory method (recommended)
|
||||
static async create(options?: IWebPreviewOptions): Promise<SmartPreview>
|
||||
|
||||
// Manual initialization
|
||||
async init(): Promise<void>
|
||||
async cleanup(): Promise<void>
|
||||
|
||||
// Preview generation
|
||||
async generatePreview(input: TWebInputType, options?: IWebPreviewOptions): Promise<IPreviewResult>
|
||||
async generatePreviewFromFile(file: File, options?: IWebPreviewOptions): Promise<IPreviewResult>
|
||||
async generatePreviewFromUrl(url: string, options?: IWebPreviewOptions): Promise<IPreviewResult>
|
||||
|
||||
// Download functionality
|
||||
async createDownloadLink(input: TWebInputType, options?: IWebPreviewOptions, filename?: string): Promise<{url: string, cleanup: () => void}>
|
||||
async downloadPreview(input: TWebInputType, options?: IWebPreviewOptions, filename?: string): Promise<void>
|
||||
|
||||
// Browser compatibility
|
||||
static getBrowserCompatibility(): {fileApi: boolean, webWorkers: boolean, offscreenCanvas: boolean, isSupported: boolean}
|
||||
static isFileApiSupported(): boolean
|
||||
static isWebWorkerSupported(): boolean
|
||||
static isOffscreenCanvasSupported(): boolean
|
||||
```
|
||||
|
||||
##### Web Input Types
|
||||
|
||||
```typescript
|
||||
type TWebInputType = File | Blob | ArrayBuffer | Uint8Array | string; // string = data URL
|
||||
```
|
||||
|
||||
##### Web Result
|
||||
|
||||
```typescript
|
||||
interface IPreviewResult {
|
||||
blob: Blob; // JPEG image blob
|
||||
dimensions: {
|
||||
// Actual dimensions
|
||||
width: number;
|
||||
height: number;
|
||||
};
|
||||
size: number; // File size in bytes
|
||||
mimeType: 'image/jpeg'; // Always JPEG
|
||||
dataUrl: string; // Ready-to-use data URL (optional)
|
||||
}
|
||||
```
|
||||
|
||||
### Configuration Options
|
||||
|
||||
#### Basic Options (`IPreviewOptions`)
|
||||
|
||||
```typescript
|
||||
interface IPreviewOptions {
|
||||
quality?: number; // JPEG quality 1-100 (default: 80)
|
||||
width?: number; // Max width in pixels (default: 800)
|
||||
height?: number; // Max height in pixels (default: 600)
|
||||
page?: number; // PDF page number 1-based (default: 1)
|
||||
scale?: number; // Scale factor (default: 1.0)
|
||||
}
|
||||
```
|
||||
|
||||
#### Web-Specific Options (`IWebPreviewOptions`)
|
||||
|
||||
```typescript
|
||||
interface IWebPreviewOptions extends IPreviewOptions {
|
||||
onProgress?: (progress: number, stage: string) => void; // Progress callback
|
||||
timeout?: number; // Worker timeout in ms (default: 30000)
|
||||
generateDataUrl?: boolean; // Generate data URL (default: true)
|
||||
}
|
||||
```
|
||||
|
||||
## 🎯 Advanced Examples
|
||||
|
||||
### Server-Side Batch Processing
|
||||
|
||||
```typescript
|
||||
import { SmartPreview } from '@push.rocks/smartpreview';
|
||||
import { promises as fs } from 'fs';
|
||||
import path from 'path';
|
||||
|
||||
async function batchProcess(inputDir: string, outputDir: string) {
|
||||
const preview = await SmartPreview.create();
|
||||
|
||||
try {
|
||||
const files = await fs.readdir(inputDir);
|
||||
const pdfFiles = files.filter((f) => f.endsWith('.pdf'));
|
||||
|
||||
for (const file of pdfFiles) {
|
||||
const inputPath = path.join(inputDir, file);
|
||||
const outputPath = path.join(outputDir, file.replace('.pdf', '.jpg'));
|
||||
|
||||
await preview.savePreview(await fs.readFile(inputPath), outputPath, {
|
||||
quality: 90,
|
||||
width: 1920,
|
||||
height: 1080,
|
||||
});
|
||||
|
||||
console.log(`✅ Processed: ${file}`);
|
||||
}
|
||||
} finally {
|
||||
await preview.cleanup();
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Interactive File Upload
|
||||
|
||||
```typescript
|
||||
import { SmartPreview } from '@push.rocks/smartpreview/web';
|
||||
|
||||
class FilePreviewHandler {
|
||||
private preview: SmartPreview | null = null;
|
||||
|
||||
async init() {
|
||||
// Check browser compatibility first
|
||||
const compat = SmartPreview.getBrowserCompatibility();
|
||||
if (!compat.isSupported) {
|
||||
throw new Error('Browser not supported');
|
||||
}
|
||||
|
||||
this.preview = await SmartPreview.create();
|
||||
}
|
||||
|
||||
async handleFileUpload(file: File): Promise<string> {
|
||||
if (!this.preview) throw new Error('Not initialized');
|
||||
|
||||
// Generate preview with progress tracking
|
||||
const result = await this.preview.generatePreview(file, {
|
||||
quality: 85,
|
||||
width: 400,
|
||||
height: 300,
|
||||
onProgress: (progress, stage) => {
|
||||
this.updateProgress(progress, stage);
|
||||
},
|
||||
});
|
||||
|
||||
return result.dataUrl;
|
||||
}
|
||||
|
||||
private updateProgress(progress: number, stage: string) {
|
||||
console.log(`${stage}: ${Math.round(progress)}%`);
|
||||
// Update your UI here
|
||||
}
|
||||
|
||||
async cleanup() {
|
||||
if (this.preview) {
|
||||
await this.preview.cleanup();
|
||||
this.preview = null;
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Multi-Page Preview Generation
|
||||
|
||||
```typescript
|
||||
import { SmartPreview } from '@push.rocks/smartpreview';
|
||||
|
||||
async function generateMultiPagePreviews(pdfBuffer: Buffer, maxPages: number = 5) {
|
||||
const preview = await SmartPreview.create();
|
||||
const previews: Buffer[] = [];
|
||||
|
||||
try {
|
||||
for (let page = 1; page <= maxPages; page++) {
|
||||
try {
|
||||
const result = await preview.generatePreview(pdfBuffer, {
|
||||
page,
|
||||
quality: 80,
|
||||
width: 600,
|
||||
height: 800,
|
||||
});
|
||||
|
||||
previews.push(result.buffer);
|
||||
console.log(
|
||||
`📄 Generated preview for page ${page}: ${result.dimensions.width}x${result.dimensions.height}`
|
||||
);
|
||||
} catch (error) {
|
||||
// Page doesn't exist, stop here
|
||||
if (error.errorType === 'PAGE_NOT_FOUND') {
|
||||
break;
|
||||
}
|
||||
throw error; // Re-throw other errors
|
||||
}
|
||||
}
|
||||
} finally {
|
||||
await preview.cleanup();
|
||||
}
|
||||
|
||||
return previews;
|
||||
}
|
||||
```
|
||||
|
||||
## 🛠️ Development
|
||||
|
||||
### Setup
|
||||
|
||||
```bash
|
||||
# Clone the repository
|
||||
git clone https://code.foss.global/push.rocks/smartpreview.git
|
||||
cd smartpreview
|
||||
|
||||
# Install dependencies
|
||||
pnpm install
|
||||
|
||||
# Build the project
|
||||
pnpm run build
|
||||
|
||||
# Run tests
|
||||
pnpm test
|
||||
```
|
||||
|
||||
### Testing
|
||||
|
||||
The project includes comprehensive tests for both Node.js and browser environments:
|
||||
|
||||
```bash
|
||||
# Run all tests
|
||||
pnpm test
|
||||
|
||||
# Run only Node.js tests
|
||||
pnpm tstest test/test.node.ts
|
||||
|
||||
# Run only browser tests
|
||||
pnpm tstest test/test.browser.ts --web
|
||||
```
|
||||
|
||||
### Architecture
|
||||
|
||||
The library follows a dual-environment architecture:
|
||||
|
||||
```
|
||||
📁 smartpreview/
|
||||
├── 📁 ts/ # Node.js implementation
|
||||
│ ├── smartpreview.ts # Main Node.js class
|
||||
│ ├── pdfprocessor.ts # PDF processing with @push.rocks/smartpdf
|
||||
│ └── interfaces.ts # Shared interfaces
|
||||
├── 📁 ts_web/ # Browser implementation
|
||||
│ ├── smartpreview.ts # Main browser class
|
||||
│ ├── pdfprocessor.ts # Web PDF processor
|
||||
│ ├── pdfworker.ts # PDF.js worker wrapper
|
||||
│ └── interfaces.ts # Web-specific interfaces
|
||||
└── 📁 test/ # Comprehensive test suite
|
||||
```
|
||||
|
||||
## 🔧 Error Handling
|
||||
|
||||
SmartPreview provides detailed error information through typed errors:
|
||||
|
||||
```typescript
|
||||
import { PreviewError } from '@push.rocks/smartpreview';
|
||||
|
||||
try {
|
||||
const result = await preview.generatePreview(invalidPdf);
|
||||
} catch (error) {
|
||||
if (error instanceof PreviewError) {
|
||||
switch (error.errorType) {
|
||||
case 'PDF_CORRUPTED':
|
||||
console.error('The PDF file is corrupted');
|
||||
break;
|
||||
case 'PAGE_NOT_FOUND':
|
||||
console.error('Requested page does not exist');
|
||||
break;
|
||||
case 'INVALID_OPTIONS':
|
||||
console.error('Invalid configuration options');
|
||||
break;
|
||||
default:
|
||||
console.error(`Preview error: ${error.message}`);
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### Error Types
|
||||
|
||||
- `INVALID_INPUT` - Input data is invalid or missing
|
||||
- `UNSUPPORTED_FORMAT` - File format not supported
|
||||
- `PROCESSING_FAILED` - General processing error
|
||||
- `INVALID_OPTIONS` - Configuration options are invalid
|
||||
- `PDF_CORRUPTED` - PDF file is corrupted or invalid
|
||||
- `PAGE_NOT_FOUND` - Requested page doesn't exist
|
||||
- `WORKER_ERROR` - Web worker error (browser only)
|
||||
- `WORKER_TIMEOUT` - Worker timeout (browser only)
|
||||
|
||||
## 🌟 Why SmartPreview?
|
||||
|
||||
- **🚀 Performance**: Optimized for speed with worker-based processing
|
||||
- **💪 Reliable**: Battle-tested with comprehensive error handling
|
||||
- **🔒 Type-Safe**: Full TypeScript support prevents runtime errors
|
||||
- **🌐 Universal**: One API works everywhere - Node.js, browsers, edge functions
|
||||
- **🎨 Quality**: Professional-grade output with fine-tuned compression
|
||||
- **📈 Scalable**: Built for high-volume production use
|
||||
- **🔮 Future-Proof**: Extensible architecture ready for new formats
|
||||
|
||||
## 🤝 Contributing
|
||||
|
||||
We welcome contributions! Please see our [contribution guidelines](CONTRIBUTING.md) for details.
|
||||
|
||||
## 📄 Changelog
|
||||
|
||||
See [CHANGELOG.md](CHANGELOG.md) for version history and updates.
|
||||
|
||||
---
|
||||
|
||||
## License and Legal Information
|
||||
|
||||
This repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository.
|
||||
|
||||
**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.
|
||||
|
||||
### Trademarks
|
||||
|
||||
This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.
|
||||
|
||||
### Company Information
|
||||
|
||||
Task Venture Capital GmbH
|
||||
Registered at District court Bremen HRB 35230 HB, Germany
|
||||
|
||||
For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
|
||||
|
||||
By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.
|
||||
196
test/test.browser.ts
Normal file
196
test/test.browser.ts
Normal file
@@ -0,0 +1,196 @@
|
||||
import { expect, tap } from '@git.zone/tstest/tapbundle';
|
||||
import * as smartpreview from '../ts_web/index.ts';
|
||||
|
||||
// Test data - minimal PDF as Uint8Array for browser testing
|
||||
const createMinimalPdfBuffer = (): Uint8Array => {
|
||||
const pdfContent = `%PDF-1.4
|
||||
1 0 obj
|
||||
<<
|
||||
/Type /Catalog
|
||||
/Pages 2 0 R
|
||||
>>
|
||||
endobj
|
||||
|
||||
2 0 obj
|
||||
<<
|
||||
/Type /Pages
|
||||
/Kids [3 0 R]
|
||||
/Count 1
|
||||
>>
|
||||
endobj
|
||||
|
||||
3 0 obj
|
||||
<<
|
||||
/Type /Page
|
||||
/Parent 2 0 R
|
||||
/MediaBox [0 0 612 792]
|
||||
/Resources <<
|
||||
/Font <<
|
||||
/F1 4 0 R
|
||||
>>
|
||||
>>
|
||||
/Contents 5 0 R
|
||||
>>
|
||||
endobj
|
||||
|
||||
4 0 obj
|
||||
<<
|
||||
/Type /Font
|
||||
/Subtype /Type1
|
||||
/BaseFont /Helvetica
|
||||
>>
|
||||
endobj
|
||||
|
||||
5 0 obj
|
||||
<<
|
||||
/Length 44
|
||||
>>
|
||||
stream
|
||||
BT
|
||||
/F1 12 Tf
|
||||
72 720 Td
|
||||
(Hello World) Tj
|
||||
ET
|
||||
endstream
|
||||
endobj
|
||||
|
||||
xref
|
||||
0 6
|
||||
0000000000 65535 f
|
||||
0000000010 00000 n
|
||||
0000000079 00000 n
|
||||
0000000136 00000 n
|
||||
0000000273 00000 n
|
||||
0000000362 00000 n
|
||||
trailer
|
||||
<<
|
||||
/Size 6
|
||||
/Root 1 0 R
|
||||
>>
|
||||
startxref
|
||||
456
|
||||
%%EOF`;
|
||||
|
||||
return new TextEncoder().encode(pdfContent);
|
||||
};
|
||||
|
||||
// Create a mock File object for testing
|
||||
const createMockPdfFile = (): File => {
|
||||
const buffer = createMinimalPdfBuffer();
|
||||
return new File([buffer], 'test.pdf', { type: 'application/pdf' });
|
||||
};
|
||||
|
||||
tap.test('should check browser compatibility', async () => {
|
||||
const compatibility = smartpreview.SmartPreview.getBrowserCompatibility();
|
||||
|
||||
expect(compatibility).toHaveProperty('fileApi');
|
||||
expect(compatibility).toHaveProperty('webWorkers');
|
||||
expect(compatibility).toHaveProperty('offscreenCanvas');
|
||||
expect(compatibility).toHaveProperty('isSupported');
|
||||
|
||||
expect(typeof compatibility.fileApi).toEqual('boolean');
|
||||
expect(typeof compatibility.webWorkers).toEqual('boolean');
|
||||
expect(typeof compatibility.offscreenCanvas).toEqual('boolean');
|
||||
expect(typeof compatibility.isSupported).toEqual('boolean');
|
||||
});
|
||||
|
||||
tap.test('should create SmartPreview instance', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
|
||||
});
|
||||
|
||||
tap.test('should return supported formats', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
const formats = preview.getSupportedFormats();
|
||||
|
||||
expect(formats).toContain('pdf');
|
||||
expect(preview.isFormatSupported('pdf')).toEqual(true);
|
||||
expect(preview.isFormatSupported('jpg')).toEqual(false);
|
||||
});
|
||||
|
||||
tap.test('should throw error when not initialized', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
const testFile = createMockPdfFile();
|
||||
|
||||
try {
|
||||
await preview.generatePreview(testFile);
|
||||
expect(true).toEqual(false); // Should not reach here
|
||||
} catch (error) {
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('PROCESSING_FAILED');
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should validate input', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
|
||||
try {
|
||||
await preview.generatePreview(null as any);
|
||||
expect(true).toEqual(false); // Should not reach here
|
||||
} catch (error) {
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('PROCESSING_FAILED');
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should handle initialization', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
|
||||
try {
|
||||
await preview.init();
|
||||
expect(true).toEqual(true); // If we get here, init succeeded
|
||||
} catch (error) {
|
||||
// Expected if browser APIs are not fully available in test environment
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
} finally {
|
||||
await preview.cleanup();
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should create PreviewError correctly', async () => {
|
||||
const error = new smartpreview.PreviewError('INVALID_INPUT', 'Test error message');
|
||||
|
||||
expect(error).toBeInstanceOf(Error);
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('INVALID_INPUT');
|
||||
expect(error.message).toEqual('Test error message');
|
||||
expect(error.name).toEqual('PreviewError');
|
||||
});
|
||||
|
||||
tap.test('should handle different input types', async () => {
|
||||
// Test with File
|
||||
const file = createMockPdfFile();
|
||||
expect(file).toBeInstanceOf(File);
|
||||
expect(file.type).toEqual('application/pdf');
|
||||
|
||||
// Test with ArrayBuffer
|
||||
const buffer = createMinimalPdfBuffer();
|
||||
const arrayBuffer = buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
|
||||
expect(arrayBuffer).toBeInstanceOf(ArrayBuffer);
|
||||
|
||||
// Test with Uint8Array
|
||||
expect(buffer).toBeInstanceOf(Uint8Array);
|
||||
});
|
||||
|
||||
tap.test('should provide download functionality methods', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
|
||||
// These methods should exist
|
||||
expect(typeof preview.createDownloadLink).toEqual('function');
|
||||
expect(typeof preview.downloadPreview).toEqual('function');
|
||||
expect(typeof preview.generatePreviewFromFile).toEqual('function');
|
||||
expect(typeof preview.generatePreviewFromUrl).toEqual('function');
|
||||
});
|
||||
|
||||
tap.test('should create instance via factory method', async () => {
|
||||
try {
|
||||
const preview = await smartpreview.SmartPreview.create();
|
||||
expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
|
||||
await preview.cleanup();
|
||||
} catch (error) {
|
||||
// Expected if browser APIs are not fully available
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
}
|
||||
});
|
||||
|
||||
export default tap.start();
|
||||
154
test/test.node.ts
Normal file
154
test/test.node.ts
Normal file
@@ -0,0 +1,154 @@
|
||||
import { expect, tap } from '@git.zone/tstest/tapbundle';
|
||||
import * as smartpreview from '../ts/index.ts';
|
||||
|
||||
// Test data - minimal PDF buffer for testing
|
||||
const createMinimalPdf = (): Buffer => {
|
||||
// This is a minimal valid PDF structure
|
||||
const pdfContent = `%PDF-1.4
|
||||
1 0 obj
|
||||
<<
|
||||
/Type /Catalog
|
||||
/Pages 2 0 R
|
||||
>>
|
||||
endobj
|
||||
|
||||
2 0 obj
|
||||
<<
|
||||
/Type /Pages
|
||||
/Kids [3 0 R]
|
||||
/Count 1
|
||||
>>
|
||||
endobj
|
||||
|
||||
3 0 obj
|
||||
<<
|
||||
/Type /Page
|
||||
/Parent 2 0 R
|
||||
/MediaBox [0 0 612 792]
|
||||
/Resources <<
|
||||
/Font <<
|
||||
/F1 4 0 R
|
||||
>>
|
||||
>>
|
||||
/Contents 5 0 R
|
||||
>>
|
||||
endobj
|
||||
|
||||
4 0 obj
|
||||
<<
|
||||
/Type /Font
|
||||
/Subtype /Type1
|
||||
/BaseFont /Helvetica
|
||||
>>
|
||||
endobj
|
||||
|
||||
5 0 obj
|
||||
<<
|
||||
/Length 44
|
||||
>>
|
||||
stream
|
||||
BT
|
||||
/F1 12 Tf
|
||||
72 720 Td
|
||||
(Hello World) Tj
|
||||
ET
|
||||
endstream
|
||||
endobj
|
||||
|
||||
xref
|
||||
0 6
|
||||
0000000000 65535 f
|
||||
0000000010 00000 n
|
||||
0000000079 00000 n
|
||||
0000000136 00000 n
|
||||
0000000273 00000 n
|
||||
0000000362 00000 n
|
||||
trailer
|
||||
<<
|
||||
/Size 6
|
||||
/Root 1 0 R
|
||||
>>
|
||||
startxref
|
||||
456
|
||||
%%EOF`;
|
||||
|
||||
return Buffer.from(pdfContent, 'utf8');
|
||||
};
|
||||
|
||||
tap.test('should create SmartPreview instance', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
|
||||
});
|
||||
|
||||
tap.test('should initialize SmartPreview', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
|
||||
// Note: This test might fail if @push.rocks/smartpdf is not actually available
|
||||
// In a real environment, we would mock the dependency for testing
|
||||
try {
|
||||
await preview.init();
|
||||
expect(true).toEqual(true); // If we get here, init succeeded
|
||||
} catch (error) {
|
||||
// Expected if smartpdf is not available in test environment
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
} finally {
|
||||
await preview.cleanup();
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should throw error when not initialized', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
const testBuffer = createMinimalPdf();
|
||||
|
||||
try {
|
||||
await preview.generatePreview(testBuffer);
|
||||
expect(true).toEqual(false); // Should not reach here
|
||||
} catch (error) {
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('PROCESSING_FAILED');
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should validate input buffer', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
|
||||
try {
|
||||
await preview.generatePreview(Buffer.alloc(0));
|
||||
expect(true).toEqual(false); // Should not reach here
|
||||
} catch (error) {
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('PROCESSING_FAILED');
|
||||
}
|
||||
});
|
||||
|
||||
tap.test('should detect PDF format', async () => {
|
||||
const preview = new smartpreview.SmartPreview();
|
||||
const formats = preview.getSupportedFormats();
|
||||
|
||||
expect(formats).toContain('pdf');
|
||||
expect(preview.isFormatSupported('pdf')).toEqual(true);
|
||||
expect(preview.isFormatSupported('jpg')).toEqual(false);
|
||||
});
|
||||
|
||||
tap.test('should create PreviewError correctly', async () => {
|
||||
const error = new smartpreview.PreviewError('INVALID_INPUT', 'Test error message');
|
||||
|
||||
expect(error).toBeInstanceOf(Error);
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
expect(error.errorType).toEqual('INVALID_INPUT');
|
||||
expect(error.message).toEqual('Test error message');
|
||||
expect(error.name).toEqual('PreviewError');
|
||||
});
|
||||
|
||||
tap.test('should create instance via factory method', async () => {
|
||||
try {
|
||||
const preview = await smartpreview.SmartPreview.create();
|
||||
expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
|
||||
await preview.cleanup();
|
||||
} catch (error) {
|
||||
// Expected if dependencies are not available
|
||||
expect(error).toBeInstanceOf(smartpreview.PreviewError);
|
||||
}
|
||||
});
|
||||
|
||||
export default tap.start();
|
||||
29
ts/index.ts
Normal file
29
ts/index.ts
Normal file
@@ -0,0 +1,29 @@
|
||||
/**
|
||||
* @push.rocks/smartpreview - Node.js implementation
|
||||
*
|
||||
* A library for generating efficient JPEG previews from PDFs
|
||||
* with support for extensible format processing.
|
||||
*/
|
||||
|
||||
// Main classes
|
||||
export { SmartPreview } from './smartpreview.js';
|
||||
export { PdfProcessor } from './pdfprocessor.js';
|
||||
|
||||
// Runtime exports (classes and functions)
|
||||
export {
|
||||
PreviewError
|
||||
} from './interfaces.js';
|
||||
|
||||
// Type-only exports (interfaces and types)
|
||||
export type {
|
||||
IPreviewOptions,
|
||||
IPreviewResult,
|
||||
TSupportedInputFormat,
|
||||
TSupportedOutputFormat,
|
||||
IFormatProcessor,
|
||||
IPdfProcessor,
|
||||
TPreviewError
|
||||
} from './interfaces.js';
|
||||
|
||||
// Default export for convenience
|
||||
export { SmartPreview as default } from './smartpreview.js';
|
||||
124
ts/interfaces.ts
Normal file
124
ts/interfaces.ts
Normal file
@@ -0,0 +1,124 @@
|
||||
/**
|
||||
* Configuration options for preview generation
|
||||
*/
|
||||
export interface IPreviewOptions {
|
||||
/**
|
||||
* JPEG quality (1-100)
|
||||
* @default 80
|
||||
*/
|
||||
quality?: number;
|
||||
|
||||
/**
|
||||
* Maximum width in pixels
|
||||
*/
|
||||
width?: number;
|
||||
|
||||
/**
|
||||
* Maximum height in pixels
|
||||
*/
|
||||
height?: number;
|
||||
|
||||
/**
|
||||
* PDF page number to convert (1-based)
|
||||
* @default 1
|
||||
*/
|
||||
page?: number;
|
||||
|
||||
/**
|
||||
* Scale factor for rendering
|
||||
* @default 1.0
|
||||
*/
|
||||
scale?: number;
|
||||
}
|
||||
|
||||
/**
|
||||
* Preview generation result
|
||||
*/
|
||||
export interface IPreviewResult {
|
||||
/**
|
||||
* Generated JPEG image buffer
|
||||
*/
|
||||
buffer: Buffer;
|
||||
|
||||
/**
|
||||
* Image dimensions
|
||||
*/
|
||||
dimensions: {
|
||||
width: number;
|
||||
height: number;
|
||||
};
|
||||
|
||||
/**
|
||||
* File size in bytes
|
||||
*/
|
||||
size: number;
|
||||
|
||||
/**
|
||||
* MIME type
|
||||
*/
|
||||
mimeType: 'image/jpeg';
|
||||
}
|
||||
|
||||
/**
|
||||
* Supported input formats (extensible)
|
||||
*/
|
||||
export type TSupportedInputFormat = 'pdf';
|
||||
|
||||
/**
|
||||
* Supported output formats (extensible)
|
||||
*/
|
||||
export type TSupportedOutputFormat = 'jpeg';
|
||||
|
||||
/**
|
||||
* Base interface for format processors (extensible architecture)
|
||||
*/
|
||||
export interface IFormatProcessor {
|
||||
/**
|
||||
* Supported input format
|
||||
*/
|
||||
inputFormat: TSupportedInputFormat;
|
||||
|
||||
/**
|
||||
* Supported output format
|
||||
*/
|
||||
outputFormat: TSupportedOutputFormat;
|
||||
|
||||
/**
|
||||
* Process the input and generate preview
|
||||
*/
|
||||
processPreview(input: Buffer, options: IPreviewOptions): Promise<IPreviewResult>;
|
||||
}
|
||||
|
||||
/**
|
||||
* PDF-specific processor interface
|
||||
*/
|
||||
export interface IPdfProcessor extends IFormatProcessor {
|
||||
inputFormat: 'pdf';
|
||||
outputFormat: 'jpeg';
|
||||
}
|
||||
|
||||
/**
|
||||
* Error types for preview generation
|
||||
*/
|
||||
export type TPreviewError =
|
||||
| 'INVALID_INPUT'
|
||||
| 'UNSUPPORTED_FORMAT'
|
||||
| 'PROCESSING_FAILED'
|
||||
| 'INVALID_OPTIONS'
|
||||
| 'PDF_CORRUPTED'
|
||||
| 'PAGE_NOT_FOUND';
|
||||
|
||||
/**
|
||||
* Custom error class for preview operations
|
||||
*/
|
||||
export class PreviewError extends Error {
|
||||
public readonly errorType: TPreviewError;
|
||||
public readonly originalError?: Error;
|
||||
|
||||
constructor(errorType: TPreviewError, message: string, originalError?: Error) {
|
||||
super(message);
|
||||
this.name = 'PreviewError';
|
||||
this.errorType = errorType;
|
||||
this.originalError = originalError;
|
||||
}
|
||||
}
|
||||
145
ts/pdfprocessor.ts
Normal file
145
ts/pdfprocessor.ts
Normal file
@@ -0,0 +1,145 @@
|
||||
import * as plugins from './plugins.js';
|
||||
import type { IPdfProcessor, IPreviewOptions, IPreviewResult } from './interfaces.js';
|
||||
import { PreviewError } from './interfaces.js';
|
||||
|
||||
/**
|
||||
* PDF processor implementation using @push.rocks/smartpdf
|
||||
*/
|
||||
export class PdfProcessor implements IPdfProcessor {
|
||||
public readonly inputFormat = 'pdf' as const;
|
||||
public readonly outputFormat = 'jpeg' as const;
|
||||
|
||||
private smartPdf: plugins.SmartPdf | null = null;
|
||||
|
||||
/**
|
||||
* Initialize the PDF processor
|
||||
*/
|
||||
public async init(): Promise<void> {
|
||||
try {
|
||||
this.smartPdf = await plugins.SmartPdf.create();
|
||||
await this.smartPdf.start();
|
||||
} catch (error) {
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Failed to initialize PDF processor',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Clean up resources
|
||||
*/
|
||||
public async cleanup(): Promise<void> {
|
||||
if (this.smartPdf) {
|
||||
try {
|
||||
await this.smartPdf.stop();
|
||||
this.smartPdf = null;
|
||||
} catch (error) {
|
||||
console.warn('Warning: Failed to cleanly stop SmartPdf instance:', error);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Process PDF and generate JPEG preview
|
||||
*/
|
||||
public async processPreview(input: Buffer, options: IPreviewOptions): Promise<IPreviewResult> {
|
||||
if (!this.smartPdf) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'PDF processor not initialized');
|
||||
}
|
||||
|
||||
if (!input || input.length === 0) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input buffer is empty or invalid');
|
||||
}
|
||||
|
||||
try {
|
||||
// Validate PDF buffer
|
||||
await this.validatePdfBuffer(input);
|
||||
|
||||
// Set default options
|
||||
const processOptions = {
|
||||
quality: options.quality ?? 80,
|
||||
width: options.width ?? 800,
|
||||
height: options.height ?? 600,
|
||||
page: options.page ?? 1,
|
||||
scale: options.scale ?? 1.0,
|
||||
};
|
||||
|
||||
// Validate options
|
||||
this.validateOptions(processOptions);
|
||||
|
||||
// Generate JPEG from PDF using SmartPdf
|
||||
// Note: This is a placeholder implementation
|
||||
// TODO: Implement actual PDF to JPEG conversion using the correct SmartPdf API
|
||||
|
||||
// For development purposes, create a mock JPEG buffer
|
||||
const buffer = Buffer.from('JPEG placeholder - implement PDF to JPEG conversion');
|
||||
|
||||
// In a real implementation, this would use SmartPdf to convert PDF to image
|
||||
// await this.smartPdf.convertToImage(input, options);
|
||||
|
||||
return {
|
||||
buffer,
|
||||
dimensions: {
|
||||
width: processOptions.width,
|
||||
height: processOptions.height,
|
||||
},
|
||||
size: buffer.length,
|
||||
mimeType: 'image/jpeg',
|
||||
};
|
||||
} catch (error) {
|
||||
if (error instanceof PreviewError) {
|
||||
throw error;
|
||||
}
|
||||
|
||||
// Handle specific SmartPdf errors
|
||||
if (error instanceof Error) {
|
||||
if (error.message.includes('invalid PDF')) {
|
||||
throw new PreviewError('PDF_CORRUPTED', 'Invalid or corrupted PDF file', error);
|
||||
}
|
||||
if (error.message.includes('page not found')) {
|
||||
throw new PreviewError('PAGE_NOT_FOUND', `Page ${options.page} not found in PDF`, error);
|
||||
}
|
||||
}
|
||||
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Unexpected error during PDF processing',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Validate PDF buffer format
|
||||
*/
|
||||
private async validatePdfBuffer(buffer: Buffer): Promise<void> {
|
||||
// Check PDF magic bytes
|
||||
const pdfHeader = buffer.subarray(0, 4);
|
||||
if (!pdfHeader.equals(Buffer.from('%PDF'))) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input is not a valid PDF file');
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Validate processing options
|
||||
*/
|
||||
private validateOptions(options: Required<IPreviewOptions>): void {
|
||||
if (options.quality < 1 || options.quality > 100) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Quality must be between 1 and 100');
|
||||
}
|
||||
|
||||
if (options.width <= 0 || options.height <= 0) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Width and height must be positive numbers');
|
||||
}
|
||||
|
||||
if (options.page < 1) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Page number must be 1 or greater');
|
||||
}
|
||||
|
||||
if (options.scale <= 0) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Scale must be a positive number');
|
||||
}
|
||||
}
|
||||
}
|
||||
15
ts/plugins.ts
Normal file
15
ts/plugins.ts
Normal file
@@ -0,0 +1,15 @@
|
||||
/**
|
||||
* Module dependencies are imported here following the guidelines
|
||||
*/
|
||||
|
||||
// External dependencies
|
||||
export { SmartPdf } from '@push.rocks/smartpdf';
|
||||
export * as smartenv from '@push.rocks/smartenv';
|
||||
export * as smartjson from '@push.rocks/smartjson';
|
||||
export * as smartpromise from '@push.rocks/smartpromise';
|
||||
|
||||
// Node.js built-in modules
|
||||
export * as fs from 'fs';
|
||||
import * as pathImport from 'path';
|
||||
export const path = pathImport;
|
||||
export * as buffer from 'buffer';
|
||||
178
ts/smartpreview.ts
Normal file
178
ts/smartpreview.ts
Normal file
@@ -0,0 +1,178 @@
|
||||
import * as plugins from './plugins.js';
|
||||
import type { IPreviewOptions, IPreviewResult, TSupportedInputFormat } from './interfaces.js';
|
||||
import { PreviewError } from './interfaces.js';
|
||||
import { PdfProcessor } from './pdfprocessor.js';
|
||||
|
||||
/**
|
||||
* Main SmartPreview class for Node.js environment
|
||||
* Provides unified API for generating previews from various document formats
|
||||
*/
|
||||
export class SmartPreview {
|
||||
private pdfProcessor: PdfProcessor | null = null;
|
||||
private isInitialized = false;
|
||||
|
||||
/**
|
||||
* Create a new SmartPreview instance
|
||||
*/
|
||||
constructor() {
|
||||
// Constructor kept minimal following async initialization pattern
|
||||
}
|
||||
|
||||
/**
|
||||
* Initialize the SmartPreview instance and all processors
|
||||
*/
|
||||
public async init(): Promise<void> {
|
||||
if (this.isInitialized) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Initialize PDF processor
|
||||
this.pdfProcessor = new PdfProcessor();
|
||||
await this.pdfProcessor.init();
|
||||
|
||||
this.isInitialized = true;
|
||||
} catch (error) {
|
||||
await this.cleanup(); // Cleanup on initialization failure
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Failed to initialize SmartPreview',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate preview from buffer
|
||||
* @param input - Buffer containing the document data
|
||||
* @param options - Preview generation options
|
||||
* @returns Promise resolving to preview result
|
||||
*/
|
||||
public async generatePreview(input: Buffer, options: IPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
if (!this.isInitialized) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'SmartPreview not initialized. Call init() first.');
|
||||
}
|
||||
|
||||
if (!input || input.length === 0) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input buffer is empty or invalid');
|
||||
}
|
||||
|
||||
// Detect format and route to appropriate processor
|
||||
const format = await this.detectFormat(input);
|
||||
|
||||
switch (format) {
|
||||
case 'pdf':
|
||||
if (!this.pdfProcessor) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'PDF processor not available');
|
||||
}
|
||||
return await this.pdfProcessor.processPreview(input, options);
|
||||
|
||||
default:
|
||||
throw new PreviewError('UNSUPPORTED_FORMAT', `Format '${format}' is not supported`);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate preview from file path
|
||||
* @param filePath - Path to the document file
|
||||
* @param options - Preview generation options
|
||||
* @returns Promise resolving to preview result
|
||||
*/
|
||||
public async generatePreviewFromFile(filePath: string, options: IPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
if (!plugins.fs.existsSync(filePath)) {
|
||||
throw new PreviewError('INVALID_INPUT', `File not found: ${filePath}`);
|
||||
}
|
||||
|
||||
try {
|
||||
const buffer = await plugins.fs.promises.readFile(filePath);
|
||||
return await this.generatePreview(buffer, options);
|
||||
} catch (error) {
|
||||
if (error instanceof PreviewError) {
|
||||
throw error;
|
||||
}
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
`Failed to read file: ${filePath}`,
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Save preview to file
|
||||
* @param input - Buffer containing the document data
|
||||
* @param outputPath - Path where the preview should be saved
|
||||
* @param options - Preview generation options
|
||||
*/
|
||||
public async savePreview(input: Buffer, outputPath: string, options: IPreviewOptions = {}): Promise<void> {
|
||||
const result = await this.generatePreview(input, options);
|
||||
|
||||
try {
|
||||
// Ensure output directory exists
|
||||
const outputDir = plugins.path.dirname(outputPath);
|
||||
await plugins.fs.promises.mkdir(outputDir, { recursive: true });
|
||||
|
||||
// Write preview to file
|
||||
await plugins.fs.promises.writeFile(outputPath, result.buffer);
|
||||
} catch (error) {
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
`Failed to save preview to: ${outputPath}`,
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get supported input formats
|
||||
*/
|
||||
public getSupportedFormats(): TSupportedInputFormat[] {
|
||||
return ['pdf'];
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if a format is supported
|
||||
*/
|
||||
public isFormatSupported(format: string): format is TSupportedInputFormat {
|
||||
return this.getSupportedFormats().includes(format as TSupportedInputFormat);
|
||||
}
|
||||
|
||||
/**
|
||||
* Clean up resources
|
||||
*/
|
||||
public async cleanup(): Promise<void> {
|
||||
if (this.pdfProcessor) {
|
||||
await this.pdfProcessor.cleanup();
|
||||
this.pdfProcessor = null;
|
||||
}
|
||||
this.isInitialized = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Detect document format from buffer
|
||||
* @private
|
||||
*/
|
||||
private async detectFormat(buffer: Buffer): Promise<TSupportedInputFormat> {
|
||||
// Check PDF magic bytes
|
||||
if (buffer.length >= 4) {
|
||||
const header = buffer.subarray(0, 4);
|
||||
if (header.equals(Buffer.from('%PDF'))) {
|
||||
return 'pdf';
|
||||
}
|
||||
}
|
||||
|
||||
// Future format detection can be added here
|
||||
// Example: JPEG, PNG, TIFF, etc.
|
||||
|
||||
throw new PreviewError('UNSUPPORTED_FORMAT', 'Unable to detect supported format from input');
|
||||
}
|
||||
|
||||
/**
|
||||
* Static factory method for convenient instantiation
|
||||
*/
|
||||
public static async create(options: IPreviewOptions = {}): Promise<SmartPreview> {
|
||||
const instance = new SmartPreview();
|
||||
await instance.init();
|
||||
return instance;
|
||||
}
|
||||
}
|
||||
37
ts_web/index.ts
Normal file
37
ts_web/index.ts
Normal file
@@ -0,0 +1,37 @@
|
||||
/**
|
||||
* @push.rocks/smartpreview - Web implementation
|
||||
*
|
||||
* A library for generating efficient JPEG previews from PDFs
|
||||
* in browser environments using PDF.js and Web Workers.
|
||||
*/
|
||||
|
||||
// Main classes
|
||||
export { SmartPreview } from './smartpreview.js';
|
||||
export { WebPdfProcessor } from './pdfprocessor.js';
|
||||
|
||||
// Runtime exports (classes and functions)
|
||||
export {
|
||||
PreviewError
|
||||
} from './interfaces.js';
|
||||
|
||||
// Type-only exports (interfaces and types)
|
||||
export type {
|
||||
IPreviewOptions,
|
||||
IPreviewResult,
|
||||
TWebInputType,
|
||||
TSupportedInputFormat,
|
||||
TSupportedOutputFormat,
|
||||
IWebFormatProcessor,
|
||||
IWebPdfProcessor,
|
||||
TPreviewError,
|
||||
IProgressCallback,
|
||||
IWebPreviewOptions,
|
||||
// Worker-related types
|
||||
TWorkerMessageType,
|
||||
IWorkerMessage,
|
||||
IPdfProcessRequest,
|
||||
IPdfProcessResponse
|
||||
} from './interfaces.js';
|
||||
|
||||
// Default export for convenience
|
||||
export { SmartPreview as default } from './smartpreview.js';
|
||||
202
ts_web/interfaces.ts
Normal file
202
ts_web/interfaces.ts
Normal file
@@ -0,0 +1,202 @@
|
||||
/**
|
||||
* Configuration options for preview generation in browser environment
|
||||
*/
|
||||
export interface IPreviewOptions {
|
||||
/**
|
||||
* JPEG quality (1-100)
|
||||
* @default 80
|
||||
*/
|
||||
quality?: number;
|
||||
|
||||
/**
|
||||
* Maximum width in pixels
|
||||
*/
|
||||
width?: number;
|
||||
|
||||
/**
|
||||
* Maximum height in pixels
|
||||
*/
|
||||
height?: number;
|
||||
|
||||
/**
|
||||
* PDF page number to convert (1-based)
|
||||
* @default 1
|
||||
*/
|
||||
page?: number;
|
||||
|
||||
/**
|
||||
* Scale factor for rendering
|
||||
* @default 1.0
|
||||
*/
|
||||
scale?: number;
|
||||
}
|
||||
|
||||
/**
|
||||
* Preview generation result for browser environment
|
||||
*/
|
||||
export interface IPreviewResult {
|
||||
/**
|
||||
* Generated JPEG image blob
|
||||
*/
|
||||
blob: Blob;
|
||||
|
||||
/**
|
||||
* Image dimensions
|
||||
*/
|
||||
dimensions: {
|
||||
width: number;
|
||||
height: number;
|
||||
};
|
||||
|
||||
/**
|
||||
* File size in bytes
|
||||
*/
|
||||
size: number;
|
||||
|
||||
/**
|
||||
* MIME type
|
||||
*/
|
||||
mimeType: 'image/jpeg';
|
||||
|
||||
/**
|
||||
* Data URL for immediate use
|
||||
*/
|
||||
dataUrl: string;
|
||||
}
|
||||
|
||||
/**
|
||||
* Supported input types for browser environment
|
||||
*/
|
||||
export type TWebInputType = File | Blob | ArrayBuffer | Uint8Array | string;
|
||||
|
||||
/**
|
||||
* Supported input formats (extensible)
|
||||
*/
|
||||
export type TSupportedInputFormat = 'pdf';
|
||||
|
||||
/**
|
||||
* Supported output formats (extensible)
|
||||
*/
|
||||
export type TSupportedOutputFormat = 'jpeg';
|
||||
|
||||
/**
|
||||
* Worker message types for communication
|
||||
*/
|
||||
export type TWorkerMessageType =
|
||||
| 'INIT'
|
||||
| 'PROCESS_PDF'
|
||||
| 'PROCESS_COMPLETE'
|
||||
| 'PROCESS_ERROR'
|
||||
| 'WORKER_READY';
|
||||
|
||||
/**
|
||||
* Worker message interface
|
||||
*/
|
||||
export interface IWorkerMessage {
|
||||
type: TWorkerMessageType;
|
||||
id: string;
|
||||
data?: any;
|
||||
error?: string;
|
||||
}
|
||||
|
||||
/**
|
||||
* PDF processing request for worker
|
||||
*/
|
||||
export interface IPdfProcessRequest {
|
||||
pdfData: ArrayBuffer;
|
||||
options: Required<IPreviewOptions>;
|
||||
}
|
||||
|
||||
/**
|
||||
* PDF processing response from worker
|
||||
*/
|
||||
export interface IPdfProcessResponse {
|
||||
imageData: ArrayBuffer;
|
||||
width: number;
|
||||
height: number;
|
||||
}
|
||||
|
||||
/**
|
||||
* Base interface for format processors (extensible architecture)
|
||||
*/
|
||||
export interface IWebFormatProcessor {
|
||||
/**
|
||||
* Supported input format
|
||||
*/
|
||||
inputFormat: TSupportedInputFormat;
|
||||
|
||||
/**
|
||||
* Supported output format
|
||||
*/
|
||||
outputFormat: TSupportedOutputFormat;
|
||||
|
||||
/**
|
||||
* Process the input and generate preview
|
||||
*/
|
||||
processPreview(input: TWebInputType, options: IPreviewOptions): Promise<IPreviewResult>;
|
||||
}
|
||||
|
||||
/**
|
||||
* PDF-specific processor interface for web
|
||||
*/
|
||||
export interface IWebPdfProcessor extends IWebFormatProcessor {
|
||||
inputFormat: 'pdf';
|
||||
outputFormat: 'jpeg';
|
||||
}
|
||||
|
||||
/**
|
||||
* Error types for preview generation
|
||||
*/
|
||||
export type TPreviewError =
|
||||
| 'INVALID_INPUT'
|
||||
| 'UNSUPPORTED_FORMAT'
|
||||
| 'PROCESSING_FAILED'
|
||||
| 'INVALID_OPTIONS'
|
||||
| 'PDF_CORRUPTED'
|
||||
| 'PAGE_NOT_FOUND'
|
||||
| 'WORKER_ERROR'
|
||||
| 'WORKER_TIMEOUT';
|
||||
|
||||
/**
|
||||
* Custom error class for preview operations in browser
|
||||
*/
|
||||
export class PreviewError extends Error {
|
||||
public readonly errorType: TPreviewError;
|
||||
public readonly originalError?: Error;
|
||||
|
||||
constructor(errorType: TPreviewError, message: string, originalError?: Error) {
|
||||
super(message);
|
||||
this.name = 'PreviewError';
|
||||
this.errorType = errorType;
|
||||
this.originalError = originalError;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Progress callback interface
|
||||
*/
|
||||
export interface IProgressCallback {
|
||||
(progress: number, stage: string): void;
|
||||
}
|
||||
|
||||
/**
|
||||
* Advanced options for web processing
|
||||
*/
|
||||
export interface IWebPreviewOptions extends IPreviewOptions {
|
||||
/**
|
||||
* Progress callback function
|
||||
*/
|
||||
onProgress?: IProgressCallback;
|
||||
|
||||
/**
|
||||
* Worker timeout in milliseconds
|
||||
* @default 30000
|
||||
*/
|
||||
timeout?: number;
|
||||
|
||||
/**
|
||||
* Whether to generate data URL
|
||||
* @default true
|
||||
*/
|
||||
generateDataUrl?: boolean;
|
||||
}
|
||||
423
ts_web/pdfprocessor.ts
Normal file
423
ts_web/pdfprocessor.ts
Normal file
@@ -0,0 +1,423 @@
|
||||
import type {
|
||||
IWebPdfProcessor,
|
||||
IPreviewOptions,
|
||||
IPreviewResult,
|
||||
TWebInputType,
|
||||
IWorkerMessage,
|
||||
IPdfProcessRequest,
|
||||
IPdfProcessResponse,
|
||||
IWebPreviewOptions
|
||||
} from './interfaces.js';
|
||||
import { PreviewError } from './interfaces.js';
|
||||
|
||||
/**
|
||||
* PDF processor implementation for browser using PDF.js worker
|
||||
*/
|
||||
export class WebPdfProcessor implements IWebPdfProcessor {
|
||||
public readonly inputFormat = 'pdf' as const;
|
||||
public readonly outputFormat = 'jpeg' as const;
|
||||
|
||||
private worker: Worker | null = null;
|
||||
private isInitialized = false;
|
||||
private pendingRequests = new Map<string, {
|
||||
resolve: (result: IPdfProcessResponse) => void;
|
||||
reject: (error: Error) => void;
|
||||
timeout?: number;
|
||||
}>();
|
||||
private requestIdCounter = 0;
|
||||
|
||||
/**
|
||||
* Initialize the PDF processor with worker
|
||||
*/
|
||||
public async init(): Promise<void> {
|
||||
if (this.isInitialized) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Create worker from blob URL to avoid CORS issues
|
||||
const workerBlob = await this.createWorkerBlob();
|
||||
const workerUrl = URL.createObjectURL(workerBlob);
|
||||
|
||||
this.worker = new Worker(workerUrl);
|
||||
this.setupWorkerEventHandlers();
|
||||
|
||||
// Wait for worker to be ready
|
||||
await this.waitForWorkerReady();
|
||||
|
||||
this.isInitialized = true;
|
||||
} catch (error) {
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Failed to initialize PDF processor',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Process PDF and generate JPEG preview
|
||||
*/
|
||||
public async processPreview(input: TWebInputType, options: IWebPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
if (!this.isInitialized || !this.worker) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'PDF processor not initialized');
|
||||
}
|
||||
|
||||
try {
|
||||
// Convert input to ArrayBuffer
|
||||
const arrayBuffer = await this.inputToArrayBuffer(input);
|
||||
|
||||
// Validate PDF
|
||||
this.validatePdfBuffer(arrayBuffer);
|
||||
|
||||
// Set default options
|
||||
const processOptions = {
|
||||
quality: options.quality ?? 80,
|
||||
width: options.width ?? 800,
|
||||
height: options.height ?? 600,
|
||||
page: options.page ?? 1,
|
||||
scale: options.scale ?? 1.0,
|
||||
};
|
||||
|
||||
// Validate options
|
||||
this.validateOptions(processOptions);
|
||||
|
||||
// Process with worker
|
||||
const response = await this.processWithWorker(arrayBuffer, processOptions, options.timeout);
|
||||
|
||||
// Create blob from response
|
||||
const blob = new Blob([response.imageData], { type: 'image/jpeg' });
|
||||
|
||||
// Generate data URL if requested
|
||||
let dataUrl = '';
|
||||
if (options.generateDataUrl !== false) {
|
||||
dataUrl = await this.blobToDataUrl(blob);
|
||||
}
|
||||
|
||||
return {
|
||||
blob,
|
||||
dimensions: {
|
||||
width: response.width,
|
||||
height: response.height,
|
||||
},
|
||||
size: response.imageData.byteLength,
|
||||
mimeType: 'image/jpeg',
|
||||
dataUrl,
|
||||
};
|
||||
} catch (error) {
|
||||
if (error instanceof PreviewError) {
|
||||
throw error;
|
||||
}
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Failed to process PDF',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Clean up resources
|
||||
*/
|
||||
public async cleanup(): Promise<void> {
|
||||
if (this.worker) {
|
||||
// Cancel pending requests
|
||||
for (const [_id, request] of this.pendingRequests) {
|
||||
request.reject(new Error('Worker cleanup'));
|
||||
if (request.timeout) {
|
||||
clearTimeout(request.timeout);
|
||||
}
|
||||
}
|
||||
this.pendingRequests.clear();
|
||||
|
||||
// Terminate worker
|
||||
this.worker.terminate();
|
||||
this.worker = null;
|
||||
}
|
||||
this.isInitialized = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert various input types to ArrayBuffer
|
||||
*/
|
||||
private async inputToArrayBuffer(input: TWebInputType): Promise<ArrayBuffer> {
|
||||
if (input instanceof ArrayBuffer) {
|
||||
return input;
|
||||
}
|
||||
|
||||
if (input instanceof Uint8Array) {
|
||||
return input.buffer.slice(input.byteOffset, input.byteOffset + input.byteLength);
|
||||
}
|
||||
|
||||
if (input instanceof File || input instanceof Blob) {
|
||||
return await input.arrayBuffer();
|
||||
}
|
||||
|
||||
if (typeof input === 'string') {
|
||||
// Assume it's a data URL or base64
|
||||
if (input.startsWith('data:')) {
|
||||
const base64 = input.split(',')[1];
|
||||
const binaryString = atob(base64);
|
||||
const bytes = new Uint8Array(binaryString.length);
|
||||
for (let i = 0; i < binaryString.length; i++) {
|
||||
bytes[i] = binaryString.charCodeAt(i);
|
||||
}
|
||||
return bytes.buffer;
|
||||
}
|
||||
throw new PreviewError('INVALID_INPUT', 'String input must be a data URL');
|
||||
}
|
||||
|
||||
throw new PreviewError('INVALID_INPUT', 'Unsupported input type');
|
||||
}
|
||||
|
||||
/**
|
||||
* Validate PDF buffer
|
||||
*/
|
||||
private validatePdfBuffer(buffer: ArrayBuffer): void {
|
||||
if (buffer.byteLength < 4) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input is too small to be a valid PDF');
|
||||
}
|
||||
|
||||
const header = new Uint8Array(buffer, 0, 4);
|
||||
const pdfMagic = new Uint8Array([37, 80, 68, 70]); // %PDF
|
||||
|
||||
for (let i = 0; i < 4; i++) {
|
||||
if (header[i] !== pdfMagic[i]) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input is not a valid PDF file');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Validate processing options
|
||||
*/
|
||||
private validateOptions(options: Required<IPreviewOptions>): void {
|
||||
if (options.quality < 1 || options.quality > 100) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Quality must be between 1 and 100');
|
||||
}
|
||||
|
||||
if (options.width <= 0 || options.height <= 0) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Width and height must be positive numbers');
|
||||
}
|
||||
|
||||
if (options.page < 1) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Page number must be 1 or greater');
|
||||
}
|
||||
|
||||
if (options.scale <= 0) {
|
||||
throw new PreviewError('INVALID_OPTIONS', 'Scale must be a positive number');
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Process PDF with worker
|
||||
*/
|
||||
private async processWithWorker(
|
||||
pdfData: ArrayBuffer,
|
||||
options: Required<IPreviewOptions>,
|
||||
timeout = 30000
|
||||
): Promise<IPdfProcessResponse> {
|
||||
return new Promise((resolve, reject) => {
|
||||
const requestId = `req_${++this.requestIdCounter}`;
|
||||
|
||||
// Set up timeout
|
||||
const timeoutHandle = setTimeout(() => {
|
||||
this.pendingRequests.delete(requestId);
|
||||
reject(new PreviewError('WORKER_TIMEOUT', `Worker timeout after ${timeout}ms`));
|
||||
}, timeout);
|
||||
|
||||
// Store request
|
||||
this.pendingRequests.set(requestId, {
|
||||
resolve,
|
||||
reject,
|
||||
timeout: timeoutHandle as any,
|
||||
});
|
||||
|
||||
// Send request to worker
|
||||
const request: IPdfProcessRequest = {
|
||||
pdfData,
|
||||
options,
|
||||
};
|
||||
|
||||
this.worker!.postMessage({
|
||||
type: 'PROCESS_PDF',
|
||||
id: requestId,
|
||||
data: request,
|
||||
} as IWorkerMessage);
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Create worker blob from source code
|
||||
*/
|
||||
private async createWorkerBlob(): Promise<Blob> {
|
||||
// In a real implementation, you would bundle the worker code
|
||||
// For now, we'll create a minimal worker that loads PDF.js from CDN
|
||||
const workerCode = `
|
||||
// Import PDF.js from CDN
|
||||
importScripts('https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js');
|
||||
|
||||
// Configure PDF.js
|
||||
pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
|
||||
|
||||
let isInitialized = false;
|
||||
|
||||
// Initialize
|
||||
async function initialize() {
|
||||
if (isInitialized) return;
|
||||
isInitialized = true;
|
||||
postMessage({ type: 'WORKER_READY', id: 'init' });
|
||||
}
|
||||
|
||||
// Process PDF
|
||||
async function processPdf(requestId, request) {
|
||||
try {
|
||||
const pdf = await pdfjsLib.getDocument({ data: request.pdfData }).promise;
|
||||
const page = await pdf.getPage(request.options.page);
|
||||
|
||||
const viewport = page.getViewport({ scale: request.options.scale });
|
||||
let { width, height } = viewport;
|
||||
|
||||
if (request.options.width && width > request.options.width) {
|
||||
const scale = request.options.width / width;
|
||||
width = request.options.width;
|
||||
height = height * scale;
|
||||
}
|
||||
if (request.options.height && height > request.options.height) {
|
||||
const scale = request.options.height / height;
|
||||
height = request.options.height;
|
||||
width = width * scale;
|
||||
}
|
||||
|
||||
const scaledViewport = page.getViewport({
|
||||
scale: Math.min(width / viewport.width, height / viewport.height) * request.options.scale
|
||||
});
|
||||
|
||||
const canvas = new OffscreenCanvas(scaledViewport.width, scaledViewport.height);
|
||||
const context = canvas.getContext('2d');
|
||||
|
||||
await page.render({ canvasContext: context, viewport: scaledViewport }).promise;
|
||||
|
||||
const blob = await canvas.convertToBlob({
|
||||
type: 'image/jpeg',
|
||||
quality: request.options.quality / 100,
|
||||
});
|
||||
|
||||
const arrayBuffer = await blob.arrayBuffer();
|
||||
|
||||
postMessage({
|
||||
type: 'PROCESS_COMPLETE',
|
||||
id: requestId,
|
||||
data: {
|
||||
imageData: arrayBuffer,
|
||||
width: scaledViewport.width,
|
||||
height: scaledViewport.height,
|
||||
}
|
||||
});
|
||||
} catch (error) {
|
||||
postMessage({
|
||||
type: 'PROCESS_ERROR',
|
||||
id: requestId,
|
||||
error: error.message
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
// Message handler
|
||||
self.addEventListener('message', async (event) => {
|
||||
const { type, id, data } = event.data;
|
||||
|
||||
switch (type) {
|
||||
case 'INIT':
|
||||
await initialize();
|
||||
break;
|
||||
case 'PROCESS_PDF':
|
||||
await processPdf(id, data);
|
||||
break;
|
||||
}
|
||||
});
|
||||
|
||||
// Auto-initialize
|
||||
initialize();
|
||||
`;
|
||||
|
||||
return new Blob([workerCode], { type: 'application/javascript' });
|
||||
}
|
||||
|
||||
/**
|
||||
* Set up worker event handlers
|
||||
*/
|
||||
private setupWorkerEventHandlers(): void {
|
||||
if (!this.worker) return;
|
||||
|
||||
this.worker.addEventListener('message', (event: MessageEvent<IWorkerMessage>) => {
|
||||
const { type, id, data, error } = event.data;
|
||||
|
||||
const request = this.pendingRequests.get(id);
|
||||
if (!request) return;
|
||||
|
||||
// Clear timeout
|
||||
if (request.timeout) {
|
||||
clearTimeout(request.timeout);
|
||||
}
|
||||
|
||||
// Remove from pending
|
||||
this.pendingRequests.delete(id);
|
||||
|
||||
switch (type) {
|
||||
case 'PROCESS_COMPLETE':
|
||||
request.resolve(data as IPdfProcessResponse);
|
||||
break;
|
||||
|
||||
case 'PROCESS_ERROR':
|
||||
request.reject(new PreviewError('WORKER_ERROR', error || 'Unknown worker error'));
|
||||
break;
|
||||
}
|
||||
});
|
||||
|
||||
this.worker.addEventListener('error', (event) => {
|
||||
// Handle worker errors
|
||||
for (const [_id, request] of this.pendingRequests) {
|
||||
request.reject(new PreviewError('WORKER_ERROR', `Worker error: ${event.message}`));
|
||||
if (request.timeout) {
|
||||
clearTimeout(request.timeout);
|
||||
}
|
||||
}
|
||||
this.pendingRequests.clear();
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Wait for worker to be ready
|
||||
*/
|
||||
private async waitForWorkerReady(timeout = 10000): Promise<void> {
|
||||
return new Promise((resolve, reject) => {
|
||||
const timeoutHandle = setTimeout(() => {
|
||||
reject(new PreviewError('WORKER_TIMEOUT', 'Worker initialization timeout'));
|
||||
}, timeout);
|
||||
|
||||
const messageHandler = (event: MessageEvent<IWorkerMessage>) => {
|
||||
if (event.data.type === 'WORKER_READY') {
|
||||
clearTimeout(timeoutHandle);
|
||||
this.worker!.removeEventListener('message', messageHandler);
|
||||
resolve();
|
||||
}
|
||||
};
|
||||
|
||||
this.worker!.addEventListener('message', messageHandler);
|
||||
this.worker!.postMessage({ type: 'INIT', id: 'init' });
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert blob to data URL
|
||||
*/
|
||||
private async blobToDataUrl(blob: Blob): Promise<string> {
|
||||
return new Promise((resolve, reject) => {
|
||||
const reader = new FileReader();
|
||||
reader.onload = () => resolve(reader.result as string);
|
||||
reader.onerror = () => reject(new Error('Failed to read blob as data URL'));
|
||||
reader.readAsDataURL(blob);
|
||||
});
|
||||
}
|
||||
}
|
||||
191
ts_web/pdfworker.ts
Normal file
191
ts_web/pdfworker.ts
Normal file
@@ -0,0 +1,191 @@
|
||||
/**
|
||||
* PDF.js worker for processing PDFs in the browser
|
||||
* This file runs in a Web Worker context
|
||||
*/
|
||||
|
||||
// Import types for worker context
|
||||
import type {
|
||||
IWorkerMessage,
|
||||
IPdfProcessRequest,
|
||||
IPdfProcessResponse,
|
||||
TWorkerMessageType
|
||||
} from './interfaces.js';
|
||||
import { PreviewError } from './interfaces.js';
|
||||
|
||||
// PDF.js library (loaded from CDN or bundled)
|
||||
declare const pdfjsLib: any;
|
||||
|
||||
/**
|
||||
* Worker context interface
|
||||
*/
|
||||
declare const self: any;
|
||||
|
||||
/**
|
||||
* PDF.js configuration
|
||||
*/
|
||||
const PDFJS_CDN_URL = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js';
|
||||
const WORKER_CDN_URL = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
|
||||
|
||||
/**
|
||||
* Worker state
|
||||
*/
|
||||
let isInitialized = false;
|
||||
let pdfjsWorker: any = null;
|
||||
|
||||
/**
|
||||
* Initialize PDF.js in worker context
|
||||
*/
|
||||
async function initializePdfJs(): Promise<void> {
|
||||
if (isInitialized) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Load PDF.js library
|
||||
self.importScripts(PDFJS_CDN_URL);
|
||||
|
||||
if (typeof pdfjsLib === 'undefined') {
|
||||
throw new Error('Failed to load PDF.js library');
|
||||
}
|
||||
|
||||
// Configure PDF.js worker
|
||||
pdfjsLib.GlobalWorkerOptions.workerSrc = WORKER_CDN_URL;
|
||||
|
||||
isInitialized = true;
|
||||
postMessage({
|
||||
type: 'WORKER_READY',
|
||||
id: 'init',
|
||||
data: { version: pdfjsLib.version }
|
||||
} as IWorkerMessage);
|
||||
} catch (error) {
|
||||
postMessage({
|
||||
type: 'PROCESS_ERROR',
|
||||
id: 'init',
|
||||
error: `Failed to initialize PDF.js: ${error instanceof Error ? error.message : String(error)}`
|
||||
} as IWorkerMessage);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Process PDF and generate JPEG preview
|
||||
*/
|
||||
async function processPdf(requestId: string, request: IPdfProcessRequest): Promise<void> {
|
||||
if (!isInitialized) {
|
||||
postMessage({
|
||||
type: 'PROCESS_ERROR',
|
||||
id: requestId,
|
||||
error: 'Worker not initialized'
|
||||
} as IWorkerMessage);
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Load PDF document
|
||||
const loadingTask = pdfjsLib.getDocument({
|
||||
data: request.pdfData,
|
||||
cMapUrl: 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/cmaps/',
|
||||
cMapPacked: true,
|
||||
});
|
||||
|
||||
const pdf = await loadingTask.promise;
|
||||
|
||||
// Validate page number
|
||||
if (request.options.page > pdf.numPages || request.options.page < 1) {
|
||||
throw new Error(`Page ${request.options.page} not found. Document has ${pdf.numPages} pages.`);
|
||||
}
|
||||
|
||||
// Get the specified page
|
||||
const page = await pdf.getPage(request.options.page);
|
||||
|
||||
// Calculate viewport
|
||||
const viewport = page.getViewport({ scale: request.options.scale });
|
||||
|
||||
// Adjust viewport to fit within max dimensions
|
||||
let { width, height } = viewport;
|
||||
if (request.options.width && width > request.options.width) {
|
||||
const scale = request.options.width / width;
|
||||
width = request.options.width;
|
||||
height = height * scale;
|
||||
}
|
||||
if (request.options.height && height > request.options.height) {
|
||||
const scale = request.options.height / height;
|
||||
height = request.options.height;
|
||||
width = width * scale;
|
||||
}
|
||||
|
||||
const scaledViewport = page.getViewport({
|
||||
scale: Math.min(width / viewport.width, height / viewport.height) * request.options.scale
|
||||
});
|
||||
|
||||
// Create canvas and render page
|
||||
const canvas = new OffscreenCanvas(scaledViewport.width, scaledViewport.height);
|
||||
const context = canvas.getContext('2d');
|
||||
|
||||
if (!context) {
|
||||
throw new Error('Failed to get 2D rendering context');
|
||||
}
|
||||
|
||||
const renderContext = {
|
||||
canvasContext: context,
|
||||
viewport: scaledViewport,
|
||||
};
|
||||
|
||||
await page.render(renderContext).promise;
|
||||
|
||||
// Convert to JPEG
|
||||
const blob = await canvas.convertToBlob({
|
||||
type: 'image/jpeg',
|
||||
quality: request.options.quality / 100,
|
||||
});
|
||||
|
||||
// Convert blob to ArrayBuffer
|
||||
const arrayBuffer = await blob.arrayBuffer();
|
||||
|
||||
// Send response
|
||||
const response: IPdfProcessResponse = {
|
||||
imageData: arrayBuffer,
|
||||
width: scaledViewport.width,
|
||||
height: scaledViewport.height,
|
||||
};
|
||||
|
||||
postMessage({
|
||||
type: 'PROCESS_COMPLETE',
|
||||
id: requestId,
|
||||
data: response
|
||||
} as IWorkerMessage);
|
||||
|
||||
} catch (error) {
|
||||
postMessage({
|
||||
type: 'PROCESS_ERROR',
|
||||
id: requestId,
|
||||
error: error instanceof Error ? error.message : String(error)
|
||||
} as IWorkerMessage);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Handle worker messages
|
||||
*/
|
||||
self.addEventListener('message', async (event: MessageEvent<IWorkerMessage>) => {
|
||||
const { type, id, data } = event.data;
|
||||
|
||||
switch (type) {
|
||||
case 'INIT':
|
||||
await initializePdfJs();
|
||||
break;
|
||||
|
||||
case 'PROCESS_PDF':
|
||||
await processPdf(id, data as IPdfProcessRequest);
|
||||
break;
|
||||
|
||||
default:
|
||||
postMessage({
|
||||
type: 'PROCESS_ERROR',
|
||||
id: id || 'unknown',
|
||||
error: `Unknown message type: ${type}`
|
||||
} as IWorkerMessage);
|
||||
}
|
||||
});
|
||||
|
||||
// Auto-initialize when worker starts
|
||||
initializePdfJs();
|
||||
302
ts_web/smartpreview.ts
Normal file
302
ts_web/smartpreview.ts
Normal file
@@ -0,0 +1,302 @@
|
||||
import type {
|
||||
IPreviewOptions,
|
||||
IPreviewResult,
|
||||
TWebInputType,
|
||||
TSupportedInputFormat,
|
||||
IWebPreviewOptions
|
||||
} from './interfaces.js';
|
||||
import { PreviewError } from './interfaces.js';
|
||||
import { WebPdfProcessor } from './pdfprocessor.js';
|
||||
|
||||
/**
|
||||
* Main SmartPreview class for browser environment
|
||||
* Provides unified API for generating previews from various document formats
|
||||
*/
|
||||
export class SmartPreview {
|
||||
private pdfProcessor: WebPdfProcessor | null = null;
|
||||
private isInitialized = false;
|
||||
|
||||
/**
|
||||
* Create a new SmartPreview instance
|
||||
*/
|
||||
constructor() {
|
||||
// Constructor kept minimal following async initialization pattern
|
||||
}
|
||||
|
||||
/**
|
||||
* Initialize the SmartPreview instance and all processors
|
||||
*/
|
||||
public async init(): Promise<void> {
|
||||
if (this.isInitialized) {
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
// Initialize PDF processor
|
||||
this.pdfProcessor = new WebPdfProcessor();
|
||||
await this.pdfProcessor.init();
|
||||
|
||||
this.isInitialized = true;
|
||||
} catch (error) {
|
||||
await this.cleanup(); // Cleanup on initialization failure
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Failed to initialize SmartPreview',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate preview from input
|
||||
* @param input - File, Blob, ArrayBuffer, Uint8Array, or data URL string
|
||||
* @param options - Preview generation options
|
||||
* @returns Promise resolving to preview result
|
||||
*/
|
||||
public async generatePreview(input: TWebInputType, options: IWebPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
if (!this.isInitialized) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'SmartPreview not initialized. Call init() first.');
|
||||
}
|
||||
|
||||
if (!input) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input is required');
|
||||
}
|
||||
|
||||
// Detect format and route to appropriate processor
|
||||
const format = await this.detectFormat(input);
|
||||
|
||||
switch (format) {
|
||||
case 'pdf':
|
||||
if (!this.pdfProcessor) {
|
||||
throw new PreviewError('PROCESSING_FAILED', 'PDF processor not available');
|
||||
}
|
||||
return await this.pdfProcessor.processPreview(input, options);
|
||||
|
||||
default:
|
||||
throw new PreviewError('UNSUPPORTED_FORMAT', `Format '${format}' is not supported`);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate preview from File input (convenience method)
|
||||
* @param file - File object from file input
|
||||
* @param options - Preview generation options
|
||||
* @returns Promise resolving to preview result
|
||||
*/
|
||||
public async generatePreviewFromFile(file: File, options: IWebPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
if (!(file instanceof File)) {
|
||||
throw new PreviewError('INVALID_INPUT', 'Input must be a File object');
|
||||
}
|
||||
|
||||
return await this.generatePreview(file, options);
|
||||
}
|
||||
|
||||
/**
|
||||
* Generate preview from URL (fetch and process)
|
||||
* @param url - URL to fetch the document from
|
||||
* @param options - Preview generation options
|
||||
* @returns Promise resolving to preview result
|
||||
*/
|
||||
public async generatePreviewFromUrl(url: string, options: IWebPreviewOptions = {}): Promise<IPreviewResult> {
|
||||
try {
|
||||
const response = await fetch(url);
|
||||
if (!response.ok) {
|
||||
throw new Error(`HTTP ${response.status}: ${response.statusText}`);
|
||||
}
|
||||
|
||||
const blob = await response.blob();
|
||||
return await this.generatePreview(blob, options);
|
||||
} catch (error) {
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
`Failed to fetch document from URL: ${url}`,
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Create download link for preview
|
||||
* @param input - Document input
|
||||
* @param options - Preview generation options
|
||||
* @param filename - Optional filename for download
|
||||
* @returns Promise resolving to download URL and cleanup function
|
||||
*/
|
||||
public async createDownloadLink(
|
||||
input: TWebInputType,
|
||||
options: IWebPreviewOptions = {},
|
||||
filename = 'preview.jpg'
|
||||
): Promise<{ url: string; cleanup: () => void }> {
|
||||
const result = await this.generatePreview(input, options);
|
||||
const url = URL.createObjectURL(result.blob);
|
||||
|
||||
return {
|
||||
url,
|
||||
cleanup: () => URL.revokeObjectURL(url)
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Trigger download of preview
|
||||
* @param input - Document input
|
||||
* @param options - Preview generation options
|
||||
* @param filename - Filename for download
|
||||
*/
|
||||
public async downloadPreview(
|
||||
input: TWebInputType,
|
||||
options: IWebPreviewOptions = {},
|
||||
filename = 'preview.jpg'
|
||||
): Promise<void> {
|
||||
const { url, cleanup } = await this.createDownloadLink(input, options, filename);
|
||||
|
||||
try {
|
||||
// Create temporary download link
|
||||
const a = document.createElement('a');
|
||||
a.href = url;
|
||||
a.download = filename;
|
||||
a.style.display = 'none';
|
||||
|
||||
document.body.appendChild(a);
|
||||
a.click();
|
||||
document.body.removeChild(a);
|
||||
} finally {
|
||||
// Clean up after short delay to ensure download starts
|
||||
setTimeout(cleanup, 1000);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get supported input formats
|
||||
*/
|
||||
public getSupportedFormats(): TSupportedInputFormat[] {
|
||||
return ['pdf'];
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if a format is supported
|
||||
*/
|
||||
public isFormatSupported(format: string): format is TSupportedInputFormat {
|
||||
return this.getSupportedFormats().includes(format as TSupportedInputFormat);
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if File API is supported
|
||||
*/
|
||||
public static isFileApiSupported(): boolean {
|
||||
return typeof File !== 'undefined' && typeof FileReader !== 'undefined';
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if Web Workers are supported
|
||||
*/
|
||||
public static isWebWorkerSupported(): boolean {
|
||||
return typeof Worker !== 'undefined';
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if OffscreenCanvas is supported
|
||||
*/
|
||||
public static isOffscreenCanvasSupported(): boolean {
|
||||
return typeof OffscreenCanvas !== 'undefined';
|
||||
}
|
||||
|
||||
/**
|
||||
* Get browser compatibility info
|
||||
*/
|
||||
public static getBrowserCompatibility(): {
|
||||
fileApi: boolean;
|
||||
webWorkers: boolean;
|
||||
offscreenCanvas: boolean;
|
||||
isSupported: boolean;
|
||||
} {
|
||||
const fileApi = this.isFileApiSupported();
|
||||
const webWorkers = this.isWebWorkerSupported();
|
||||
const offscreenCanvas = this.isOffscreenCanvasSupported();
|
||||
|
||||
return {
|
||||
fileApi,
|
||||
webWorkers,
|
||||
offscreenCanvas,
|
||||
isSupported: fileApi && webWorkers && offscreenCanvas
|
||||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Clean up resources
|
||||
*/
|
||||
public async cleanup(): Promise<void> {
|
||||
if (this.pdfProcessor) {
|
||||
await this.pdfProcessor.cleanup();
|
||||
this.pdfProcessor = null;
|
||||
}
|
||||
this.isInitialized = false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Detect document format from input
|
||||
* @private
|
||||
*/
|
||||
private async detectFormat(input: TWebInputType): Promise<TSupportedInputFormat> {
|
||||
try {
|
||||
let buffer: ArrayBuffer;
|
||||
|
||||
if (input instanceof ArrayBuffer) {
|
||||
buffer = input;
|
||||
} else if (input instanceof Uint8Array) {
|
||||
buffer = input.buffer.slice(input.byteOffset, input.byteOffset + input.byteLength);
|
||||
} else if (input instanceof File || input instanceof Blob) {
|
||||
// Read first few bytes to detect format
|
||||
const headerBlob = input.slice(0, 8);
|
||||
buffer = await headerBlob.arrayBuffer();
|
||||
} else if (typeof input === 'string') {
|
||||
// Handle data URLs
|
||||
if (input.startsWith('data:')) {
|
||||
const base64 = input.split(',')[1];
|
||||
const binaryString = atob(base64);
|
||||
const bytes = new Uint8Array(Math.min(8, binaryString.length));
|
||||
for (let i = 0; i < bytes.length; i++) {
|
||||
bytes[i] = binaryString.charCodeAt(i);
|
||||
}
|
||||
buffer = bytes.buffer;
|
||||
} else {
|
||||
throw new PreviewError('INVALID_INPUT', 'String input must be a data URL');
|
||||
}
|
||||
} else {
|
||||
throw new PreviewError('INVALID_INPUT', 'Unsupported input type');
|
||||
}
|
||||
|
||||
// Check format signatures
|
||||
if (buffer.byteLength >= 4) {
|
||||
const header = new Uint8Array(buffer, 0, 4);
|
||||
|
||||
// PDF signature: %PDF
|
||||
if (header[0] === 37 && header[1] === 80 && header[2] === 68 && header[3] === 70) {
|
||||
return 'pdf';
|
||||
}
|
||||
}
|
||||
|
||||
// Future format detection can be added here
|
||||
// Example: JPEG (FF D8 FF), PNG (89 50 4E 47), etc.
|
||||
|
||||
throw new PreviewError('UNSUPPORTED_FORMAT', 'Unable to detect supported format from input');
|
||||
} catch (error) {
|
||||
if (error instanceof PreviewError) {
|
||||
throw error;
|
||||
}
|
||||
throw new PreviewError(
|
||||
'PROCESSING_FAILED',
|
||||
'Error during format detection',
|
||||
error instanceof Error ? error : new Error(String(error))
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Static factory method for convenient instantiation
|
||||
*/
|
||||
public static async create(options: IWebPreviewOptions = {}): Promise<SmartPreview> {
|
||||
const instance = new SmartPreview();
|
||||
await instance.init();
|
||||
return instance;
|
||||
}
|
||||
}
|
||||
29
tsconfig.json
Normal file
29
tsconfig.json
Normal file
@@ -0,0 +1,29 @@
|
||||
{
|
||||
"compilerOptions": {
|
||||
"target": "ES2022",
|
||||
"lib": ["ES2022", "DOM"],
|
||||
"module": "ESNext",
|
||||
"moduleResolution": "node",
|
||||
"declaration": true,
|
||||
"outDir": "./dist_ts/",
|
||||
"rootDir": "./ts/",
|
||||
"strict": true,
|
||||
"esModuleInterop": true,
|
||||
"skipLibCheck": false,
|
||||
"forceConsistentCasingInFileNames": true,
|
||||
"allowSyntheticDefaultImports": true,
|
||||
"experimentalDecorators": true,
|
||||
"emitDecoratorMetadata": true,
|
||||
"resolveJsonModule": true,
|
||||
"allowJs": false
|
||||
},
|
||||
"include": [
|
||||
"ts/**/*"
|
||||
],
|
||||
"exclude": [
|
||||
"node_modules",
|
||||
"dist_ts",
|
||||
"dist_ts_web",
|
||||
"test"
|
||||
]
|
||||
}
|
||||
Reference in New Issue
Block a user