Using `else` after `return` is not necessary, and can often lead to unnecessarily cluttered code. By using the `no-else-return` rule in ESLint we can avoid this pattern, see http://eslint.org/docs/rules/no-else-return.
A user encountered a response that looks like:
URL: some gibberish
Headers:
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="something.pdf"
In the Chrome extension, the "attachment" content disposition is almost
always ignored (i.e. the PDF Viewer will try to view it anyway). So we
need to fall back to the Content-Disposition header if the URL check is
inconclusive.
The Chrome extension enforces that local files cannot be embedded in
non-local web pages. The previous check was too strict (because the
origin of a file:-URL is "null"), and prevented local PDF from being
viewed in local files).
This patch fixes that problem, by querying the actual tab URL via the
background page.
Steps to verify:
1. Create a HTML file: `<iframe src=test.pdf width=100% height=100%>`
2. Build and load the extension.
3. Allow file access to the extension at `chrome://extensions`
4. Open the HTML file from a file:// URL.
5. VERIFY: The extension should attempt to load the PDF file.
6. Now open the following (replace ID with the extension ID, which you
can find at `chrome://extensions`):
`data:text/html,<iframe src="chrome-extension://ID/file:///test.pdf">`
7. VERIFY: The next error should be displayed:
"Refused to load a local file in a non-local page for security reasons."
http://crbug.com/280464 has been resolved, so we can now use redirectUrl at
onHeadersReceived.
For backwards-compatibility, the code for the original method has not been
removed, and a feature detection script was added that detects whether the
desired feature is available.
The current stable Chromium version is 29. Since the critical
bug that prevented use of incognito:split has been fixed, and
incognito:split is actually used, it's safe to drop the code
that disables the extension in incognito mode.
( fixed bug = http:/crbug.com/224094 )
And use split incognito mode
Previous method:
- Rewrite content type to XHTML, followed by a content script
to cancel and replace the document with the viewer.
( https://github.com/mozilla/pdf.js/pull/3017 )
New method:
- Cancel loading of the document, followed by a redirect to the viewer
Disadvantage of new method:
- URLs are no longer "nice". This will be addressed by cherry-picking
a commit from the crx-using-streams-api branch.
Advantages of new method:
- Idle time is minimal. In some cases (with large documents),
it took too much time before the content script was activated.
During this period, the page looked blank, and the contents of
the PDF file were still retrieved and **discarded**.
With the new method, the idle time is minimal, because the request
is immediately cancelled.
- No FOUXEP (Flash of unhidden XML error page), because the XHTML
Content-Type hack is no longer used.
