Use streamsPrivate API when available.
When the API is not available, the extension will still work on
on http/https/file URLs, but not for POST requests or FTP.
As of writing, the Chromium project has still not whitelisted
the PDF Viewer extension in the Chrome Web Store.
(extension ID oemmndcbldboiebfnladdacbdfmadadm)
Request to whitelist PDF.js in Chromium:
https://code.google.com/p/chromium/issues/detail?id=326949
Opera 19 has whitelisted the PDF Viewer extension from
https://addons.opera.com/extensions/details/pdf-viewer/
(extension ID encfpfilknmenlmjemepncnlbbjlabkc)
(https://github.com/Rob--W/pdf.js/issues/1#issuecomment-32357302)
If you want to test the streamsPrivate feature in Chrome,
edit the build/extensions/manifest.json and add the "key" again
(see this commit for the value of this "key" field).
When a new incognito session is started, the onExecuteMimeTypeHandler event is
often not dispatched in time. Instead, it's triggered in the non-incognito profile.
This commit offers a work-around that allows new incognito instances to view PDF files.
Also:
- Use webNavigation.getAllFrames to find out whether the navigation has
already started. This is (at least) needed for top-level navigation to
a stream. The webNavigation.onErrorOccurred event has become obsolete,
and has been removed.
This method captures all application/pdf streams, loads the viewer
and passes the stream to the PDF.js viewer.
This commit shows a proof of concept using the chrome.streamsPrivate API.
Advantages of new method:
- Access to the response body of the original request, thus fewer
network requests.
- PDFs from non-GET requests (e.g. POST) are now supported.
- FTP files are also supported.
Possible improvements:
- Use declared content scripts instead of dynamic chrome.tabs.executeScript.
This allows the extension to render the viewer in frames when the
extension is disallowed to run executeScript for the top URL.
- Use chrome.declarativeWebRequest instead of webRequest, and replace
background page with event page (don't forget to profile the
difference & will the background/event page still work as intended?).
Tim van der Meij
Rob Wu