PDF viewer only shows first 50 pages

Tjelfe · January 30, 2018, 6:46am

When viewing a large PDF file using the Seafile web interface only the first 50 pages are displayed. Where is this restriction managed (Seafile, webserver, pdf viewer) an how can it be removed?
I use Seafile CE for Raspberry Pi with nginx on a cubietruck running armbian. Any help is much appriciated.

holantomas · January 30, 2018, 7:00am

You have to edit file /seahub/templates/snippets/pdfjs_file_viewer.html. But limitation is there for some reason, so do not blame developer that your browser crash or slow down.

AND you have to edit this file every Seafile server update.

First mention about 50 pages limit start on line 22. It’s only shows message that document is limited.

github.com

haiwen/seahub/blob/2d98cc405d99cad4acff7167b375971a7c2faf54/seahub/templates/snippets/pdfjs_file_viewer.html#L22


    sx: pixelRatio,
    sy: pixelRatio,
    scaled: pixelRatio !== 1
};
}


try {
PDFJS.workerSrc = '{{MEDIA_URL}}js/pdf.worker.js';
$('#file-view').html('<div id="pdf"><span class="loading-icon loading-tip"></span></div>');
PDFJS.getDocument("{{ raw_path|escapejs }}").then(function(pdf) {
    if (pdf.numPages > 50) {
        feedback("{% trans "This file has more than 50 pages, and only the first 50 will be shown here." %}", 'info');
    }


    var $loadingTip = $('#pdf .loading-tip');


    // show at most 50 pages
    var shownPageCount = pdf.numPages < 50 ? pdf.numPages : 50;


    var getPageAndRender = function (pageNumber) {
        pdf.getPage(pageNumber).then(function(page) {

For edit shoed pages, update line 29. Just change line below to and use number of pages you want var shownPageCount = pdf.numPages < 100 ? pdf.numPages : 100;

github.com

haiwen/seahub/blob/2d98cc405d99cad4acff7167b375971a7c2faf54/seahub/templates/snippets/pdfjs_file_viewer.html#L29


PDFJS.workerSrc = '{{MEDIA_URL}}js/pdf.worker.js';
$('#file-view').html('<div id="pdf"><span class="loading-icon loading-tip"></span></div>');
PDFJS.getDocument("{{ raw_path|escapejs }}").then(function(pdf) {
    if (pdf.numPages > 50) {
        feedback("{% trans "This file has more than 50 pages, and only the first 50 will be shown here." %}", 'info');
    }


    var $loadingTip = $('#pdf .loading-tip');


    // show at most 50 pages
    var shownPageCount = pdf.numPages < 50 ? pdf.numPages : 50;


    var getPageAndRender = function (pageNumber) {
        pdf.getPage(pageNumber).then(function(page) {
            var scale = 1.5;
            var viewport = page.getViewport(scale);
            var $canvas = $('<canvas class="pdf-page"></canvas>');
            var canvas = $canvas[0];


            var ctx = canvas.getContext('2d', {alpha: false});
            var outputScale = getOutputScale(ctx);

Tjelfe · January 30, 2018, 7:28am

Thanks for Your reply. @daniel.pan: Any chance to make this behaviour configurable in future versions?

holantomas · January 30, 2018, 9:12am

You can change constants 50 to configuration constant for example PDF_PAGES_COUNT

So changes 50 in source code to {{PDF_PAGES_COUNT}} and in settings.py setup default value to 50, then send pull request.

It should be configurable in seahub_settings.py

Tjelfe · January 30, 2018, 9:30am

Well, what might sound easy to do for You looks more like a deep dive for me. I’m not as deep in coding as You are. I’ll try to figure out how to do it this evening. Thanks again for Your detailed explanation.

holantomas · January 30, 2018, 9:36am

For make it clear. I’m not Python dev, and not sure that this is working way i’m just guesing and don’t have time to test it or find a way. It’s only looks like it can works.

I’m sure that there should be some input check for configuration value, cause you can type some float typed number or string that may crash server, but maybe seafile devs don’t care about it cause you have to know what you doing, who knows?

Tjelfe · January 30, 2018, 12:03pm

OK, I’ll investigate further and report here.

mercury · April 24, 2018, 5:42pm

This might be a possible work around. I disabled pdf.js via:

USE_PDFJS = False

in seahub_settings.py and added ‘pdf’ to OnlyOffice (OO) running in Subdirectory mode

ONLYOFFICE_FILE_EXTENSION = (‘doc’, ‘docx’, ‘ppt’, ‘pptx’, ‘xls’, ‘xlsx’, ‘odt’, ‘fodt’, ‘odp’, ‘fodp’, ‘ods’, ‘fods’, ‘pdf’)

Long PDFs open in the OO Document Viewer as read-only documents.

DerDanilo · April 24, 2018, 7:16pm

Maybe put this into the manual.

Tjelfe · April 26, 2018, 11:04am

Good idea! Thanks for the hint.

bionade24 · July 1, 2018, 4:24pm

Since version 6.3.1 this isn’t working. Any solutions? Or do I have to make a pull request?

mercury · July 1, 2018, 6:53pm

I can confirm the problem in CE 6.3.1 under Ubuntu 16.04.

It looks like ‘USE_PDFJS = False’ in seahub_settings.py is being ignored. I can see ‘type=“text/javascript” src="/media/js/pdf.js"’ being executed in the Web console in Firefox.

There is an associated error in Firefox:

Source map error: request failed with status 404
Resource URL: https://sf.mydomain.com/media/assets/css/bootstrap.min.b00faad199b5.css
Source Map URL: bootstrap.min.css.map[Learn More]

Chromium Javacript console shows:

pdf.js:6211 The provided value ‘moz-chunked-arraybuffer’ is not a valid enum value of type XMLHttpRequestResponseType.
supportsMozChunkedClosure @ pdf.js:6211

Are these related in any way?

mercury · July 12, 2018, 12:33am

Looks like this is not fixed in CE 6.3.2. Is this a bona fide bug? Can we get someone in development to confirm or deny (@daniel.pan)? -Thanks

daniel.pan · July 12, 2018, 1:09am

It will be fixed in a future release.

billkenney · July 23, 2018, 5:23am

I created a pdfjs_file_viewer.html in my seahub-data/custom folder, I commented out the 50 page warning and modified the code from:
var shownPageCount = pdf.numPages < 50 ? pdf.numPages : 50;
to:
shownPageCount = pdf.numPages;

Then I created a simple script to backup the original pdfjs_file_viewer.html file and replace it with a symlink to my modified version. Then I just run the script every time I update.

Code for the script is as follows:

#!/bin/sh
cd /home/pi/haiwen/seafile-server-latest/seahub/seahub/templates/snippets
mkdir backup
mv pdfjs_file_viewer.html backup
ln -s /home/pi/haiwen/seahub-data/custom/scripts/pdfjs_file_viewer.html pdfjs_file_viewer.html

mercury · September 10, 2018, 2:00am

Looks like no change in CE 6.3.3. Can someone confirm or deny?

111 · October 27, 2018, 12:25pm

I confirm, version CE 6.3.4 bug is not fixed.

shoeper · October 27, 2018, 5:01pm

https://manual.seafile.com/config/seafevents-conf.html

111 · October 27, 2018, 5:12pm

But this is only for the professional version.

mercury · October 29, 2018, 3:56pm

My biggest concern is that ‘USE_PDFJS = False’ in seahub_settings.py is still being ignored (CE 6.3.4). I’d like to see that fixed so that the OO workaround works again.

I did find another workaround, however. If I go to my Seafile server using a web browser using WebDAV (https://sf.mydomain.com/seafdav in my case) I can login and access long PDF documents in the browser.