smartpdf/ts/smartpdf.classes.smartpdf.ts
2021-04-14 11:34:33 +00:00

153 lines
4.6 KiB
TypeScript

import * as plugins from './smartpdf.plugins';
import * as paths from './smartpdf.paths';
import { Server } from 'http';
import { PdfCandidate } from './smartpdf.classes.pdfcandidate';
declare const document;
import * as interfaces from './interfaces';
export class SmartPdf {
htmlServerInstance: Server;
serverPort: number;
headlessBrowser: plugins.smartpuppeteer.puppeteer.Browser;
externalBrowserBool: boolean = false;
private _readyDeferred: plugins.smartpromise.Deferred<void>;
private _candidates: { [key: string]: PdfCandidate } = {};
constructor() {
this._readyDeferred = new plugins.smartpromise.Deferred();
}
async start(headlessBrowserArg?) {
// lets set the external browser in case one is provided
this.headlessBrowser = headlessBrowserArg;
// setup puppeteer
if (this.headlessBrowser) {
this.externalBrowserBool = true;
} else {
this.headlessBrowser = await plugins.smartpuppeteer.getEnvAwareBrowserInstance({
forceNoSandbox: true,
});
}
// setup server
const app = plugins.express();
app.get('/:pdfId', (req, res) => {
res.setHeader('PDF-ID', this._candidates[req.params.pdfId].pdfId);
res.send(this._candidates[req.params.pdfId].htmlString);
});
this.htmlServerInstance = plugins.http.createServer(app);
const smartnetworkInstance = new plugins.smartnetwork.SmartNetwork();
const portAvailable = smartnetworkInstance.isLocalPortUnused(3210);
this.htmlServerInstance.listen(3210, 'localhost');
this.htmlServerInstance.on('listening', () => {
this._readyDeferred.resolve();
});
}
// stop
async stop() {
const done = plugins.smartpromise.defer<void>();
this.htmlServerInstance.close(() => {
done.resolve();
});
if (!this.externalBrowserBool) {
await this.headlessBrowser.close();
}
await done.promise;
}
/**
* returns a pdf for a given html string;
*/
async getPdfResultForHtmlString(htmlStringArg: string): Promise<interfaces.IPdfResult> {
await this._readyDeferred.promise;
const pdfCandidate = new PdfCandidate(htmlStringArg);
this._candidates[pdfCandidate.pdfId] = pdfCandidate;
const page = await this.headlessBrowser.newPage();
const response = await page.goto(`http://localhost:3210/${pdfCandidate.pdfId}`, {
waitUntil: 'networkidle2',
});
const headers = response.headers();
if (headers['pdf-id'] !== pdfCandidate.pdfId) {
console.log('Error! Headers do not match. For security reasons no pdf is being emitted!');
return;
} else {
console.log(`id security check passed for ${pdfCandidate.pdfId}`);
}
const pdfBuffer = await page.pdf({
format: 'A4',
printBackground: true,
displayHeaderFooter: false,
preferCSSPageSize: true,
});
await page.close();
delete this._candidates[pdfCandidate.pdfId];
pdfCandidate.doneDeferred.resolve();
await pdfCandidate.doneDeferred.promise;
return {
id: pdfCandidate.pdfId,
name: `${pdfCandidate.pdfId}.js`,
buffer: pdfBuffer,
};
}
async getPdfResultForWebsite(websiteUrl: string): Promise<interfaces.IPdfResult> {
const page = await this.headlessBrowser.newPage();
await page.emulateMediaType('screen');
const response = await page.goto(websiteUrl, { waitUntil: 'networkidle2' });
const pdfId = plugins.smartunique.shortId();
const { documentHeight, documentWidth } = await page.evaluate(() => {
return {
documentHeight: document.height,
documentWidth: document.width,
};
});
const pdfBuffer = await page.pdf({
format: 'A4',
height: documentWidth,
width: documentWidth,
printBackground: true,
displayHeaderFooter: false,
preferCSSPageSize: true,
});
await page.close();
return {
id: pdfId,
name: `${pdfId}.js`,
buffer: pdfBuffer,
};
}
async getFullWebsiteAsSinglePdf(websiteUrl: string) {
const page = await this.headlessBrowser.newPage();
page.emulateMediaType('screen');
const response = await page.goto(websiteUrl, { waitUntil: 'networkidle2' });
const pdfId = plugins.smartunique.shortId();
const { documentHeight, documentWidth } = await page.evaluate(() => {
return {
documentHeight: document.height,
documentWidth: document.width,
};
});
const pdfBuffer = await page.pdf({
format: 'A4',
height: documentWidth,
width: documentWidth,
printBackground: true,
displayHeaderFooter: false,
preferCSSPageSize: true,
});
await page.close();
return {
id: pdfId,
name: `${pdfId}.js`,
buffer: pdfBuffer,
};
}
}