Cannot open PDF inside shared folders

[hmt]

Describe the bug
A publicly shared PDF inside a folder cannot be opened in the viewer. It says Invalid or corrupted PDF file

To Reproduce
Steps to reproduce the behavior:

1. Create folder and add PDF file to it
2. Share folder and create public link
3. Open public link
4. Click on PDF file to view

Expected behavior
File can be viewed

Screenshots

File cannot be viewed

** Platform **
everywhere

Browser log

Uncaught (in promise) Error: Invalid or corrupted PDF file.
    _callee7$/</< app.js:817
    promise callback*_callee7$/< app.js:815
    promise callback*_callee7$ app.js:776
    Babel 8
        tryCatch
        invoke
        method
        asyncGeneratorStep
        _next
        _asyncToGenerator
        _asyncToGenerator
        open
    webViewerOpenFileViaURL app.js:1947
    webViewerInitialized app.js:1917
    promise callback*run app.js:478
    webViewerLoad viewer.js:218
    EventListener.handleEvent* viewer.js:228
    Webpack 3
        __webpack_require__
        <anonymous>
        <anonymous>
app.js:817:16

Additional context
It is fine to share a single PDF. A single PDF can be opened just fine. This only happens for PDF files that are in a shared folder.
This happened immediately after the 20.0.7 update.
First posted here: nextcloud/viewer#764

[RealKelsar]

Hi,

same Problem here, but I notice it tries a Auth Call to our SAML Provider, but that one gets suppresed by the browser because of CSP.

Opening the same PDF in OnlyOffice from the context Menu does work finde and I do not see such a call there.

[RealKelsar]

Guess it is the same Issue as in #286

[hmt]

Yes, you're correct. Didn't see that bug. But for me this only appeared in 20.0.7

[RealKelsar]

Same here.

[Hanskes]

Same problem here, since update to 20.0.7

[szaimen]

cc @skjnldsv

[ksteinb]

Same here

[Mehvix]

Same here.

[dsiminiuk]

+1

[nderambure]

This is the same bug than here : #207

[wankdanker]

The problem is that the URL that is fetched by the PDF viewer appears to be URL encoded like:

https://cloud.nendzynski.de:8443/index.php/s/o49EBjHoe78GQEj/download%3Fpath%3D/%26files%3DTest.pdf

Where it should be:

https://cloud.nendzynski.de:8443/index.php/s/o49EBjHoe78GQEj/download?path=/&files=Test.pdf

And the server responds with a 302 redirect to the login page.

I am not familiar with the code base, but I'm trying to trace where the URL is generated. Maybe this will help someone else though.

[LPJon]

Same here. I get this error on Shared PDF Viewing ONLY:
Nextcloud Version v20.0.7

PDF.js v2.4.456 (build: 228a591c)
Message: Invalid PDF structure.

[dsiminiuk]

It looks like a fix is in progress in #309

[skjnldsv]

fix in #319

[hmt]

Tahnks for fixing this bug. Is it possible to get the app released as an update any time soon? People are shouting at me all the time because they don't understand how to download a pdf.