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Ensure that the same exact version of PDF.js is used in both the API and the Worker

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I don't have a good example at hand right know, but I recall seeing custom deployments of PDF.js that bundle a *specific* version of the `build/pdf.js` file and then set `PDFJS.workerSrc` to point to https://mozilla.github.io/pdf.js/build/pdf.worker.js.
That practice seems really bad since, besides (obviously) causing unnecessary server load, it will very quickly result in a version mismatch between the `pdf.js` and `pdf.worker.js` files in those PDF.js deployments.
Such a version mismatch could easily lead to either breaking errors, or even worse slightly inconsistent behaviour for an API call (if the API -> Worker interface changes, which does happen from time to time).

To avoid the problems described above, I'm thus proposing that we enforce that the versions of the `pdf.js` and `pdf.worker.js` files must always match.
This commit is contained in:
Jonas Jenwald 2017-09-27 15:19:31 +02:00
parent b837187094
commit 7d3efe43a2
2 changed files with 12 additions and 0 deletions
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9
src/core/worker.js
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@ -364,6 +364,15 @@ var WorkerMessageHandler = {
var cancelXHRs = null;
var WorkerTasks = [];
let apiVersion = docParams.apiVersion;
let workerVersion =
typeof PDFJSDev !== 'undefined' ? PDFJSDev.eval('BUNDLE_VERSION') : null;
// The `apiVersion !== null` check is needed to avoid errors during testing.
if (apiVersion !== null && apiVersion !== workerVersion) {
throw new Error(`The API version "${apiVersion}" does not match ` +
`the Worker version "${workerVersion}".`);
}
var docId = docParams.docId;
var docBaseUrl = docParams.docBaseUrl;
var workerHandlerName = docParams.docId + '_worker';