smartpdf/ts/smartpdf.classes.smartpdf.ts

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import * as plugins from './smartpdf.plugins';
import * as paths from './smartpdf.paths';
import { Server } from 'http';
import { PdfCandidate } from './smartpdf.classes.pdfcandidate';
export class SmartPdf {
htmlServerInstance: Server;
serverPort: number;
headlessBrowser: plugins.puppeteer.Browser;
private _readyDeferred: plugins.smartpromise.Deferred<void>;
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private _candidates: { [key: string]: PdfCandidate } = {};
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constructor() {
this._readyDeferred = new plugins.smartpromise.Deferred();
this.init();
}
async init() {
// setup puppeteer
this.headlessBrowser = await plugins.puppeteer.launch();
// 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.isLocalPortAvailable(3210);
this.htmlServerInstance.listen(3210, 'localhost');
this.htmlServerInstance.on('listening', () => {
this._readyDeferred.resolve();
});
}
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async close () {
const done = plugins.smartpromise.defer<void>();
this.htmlServerInstance.close(() => {
done.resolve();
});
await this.headlessBrowser.close();
await done.promise;
}
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/**
* returns a pdf for a given html string;
*/
async getPdfForHtmlString(htmlStringArg: string) {
await this._readyDeferred.promise;
const pdfCandidate = new PdfCandidate(htmlStringArg);
this._candidates[pdfCandidate.pdfId] = pdfCandidate;
const page = await this.headlessBrowser.newPage();
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const response = await page.goto(`http://localhost:3210/${pdfCandidate.pdfId}`, {
waitUntil: 'networkidle2'
});
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const headers = response.headers();
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if (headers['pdf-id'] !== pdfCandidate.pdfId) {
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console.log('Error! Headers do not match. For security reasons no pdf is being emitted!');
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return;
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} else {
console.log(`id security check passed for ${pdfCandidate.pdfId}`);
}
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await page.pdf({
path: plugins.path.join(paths.pdfDir, `${pdfCandidate.pdfId}.pdf`),
format: 'A4'
});
await page.close();
delete this._candidates[pdfCandidate.pdfId];
pdfCandidate.doneDeferred.resolve();
await pdfCandidate.doneDeferred.promise;
}
async getPdfForWebsite(websiteUrl: string) {
const page = await this.headlessBrowser.newPage();
const response = await page.goto(websiteUrl, { waitUntil: 'networkidle2' });
const pdfId = plugins.smartunique.shortId();
await page.pdf({
path: plugins.path.join(paths.pdfDir, `${pdfId}.pdf`),
format: 'A4'
});
await page.close();
}
}