Can't upload files using webapp-container

[Alessandro Viprati]

I'm not able to upload files using webapp-container.

I've tried this:

 1. $ webapp-container wiki.ubuntu-it.org
 2. login to the italian wiki
 3. click on the "attachment" link
 4. click on the icon to upload files

Expected: a window for upload files should open
Swat happens: error in the terminal:
"FilePicker::Show: Content requested a file picker, but the application hasn't provided one"

This is the complete output from the terminal:

$ webapp-container wiki.ubuntu-it.org
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
qml: Loading webview on /home/alessandro/.local/share/webbrowser-app
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
QQmlExpression: Expression file:///usr/share/webbrowser-app/webcontainer/WebApp.qml:272:25 depends on non-NOTIFYable properties:
    unity::action::qml::ActionManager::globalContext
qml: Loaded 5 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-mobile.js
qml: Start browsing
file:///usr/share/webbrowser-app/webcontainer/ContentPickerDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/webcontainer/ContentDownloadDialog.qml:22:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/ContentHandler.qml:20:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed
file:///usr/share/webbrowser-app/Downloader.qml:23:1: module "Ubuntu.Content" is not installed
qml: Loaded 5 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-desktop.js
[0922/191134:ERROR:layer_tree_host_impl.cc(2250)] Forcing zero-copy tile initialization as worker context is missing
TouchSelectionController::active is deprecated, use TouchSelectionController::status instead
FilePicker::Show: Content requested a file picker, but the application hasn't provided one
FilePicker::Show: Content requested a file picker, but the application hasn't provided one
FilePicker::Show: Content requested a file picker, but the application hasn't provided one
FilePicker::Show: Content requested a file picker, but the application hasn't provided one
FilePicker::Show: Content requested a file picker, but the application hasn't provided one

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: webapp-container 0.23+16.04.20160413-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Sep 22 19:14:06 2016
InstallationDate: Installed on 2016-08-30 (22 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: webbrowser-app
UpgradeStatus: No upgrade log present (probably fresh install)

[Olivier Tilloy (osomon)]

Try installing qtdeclarative5-ubuntu-content1, that should solve the issue:

  sudo apt install qtdeclarative5-ubuntu-content1

[Alessandro Viprati (vipri-alessandro)]

Installed the package 'qtdeclarative5-ubuntu-content1' and its dependencies.

Now, when I try to upload files, webapps open the page:
"Choose from" (or something similar, I'm translating from italian) with the indication that "no apps are installed which can provide this kind of content".

Running webapp-contanier with terminal, I still get the output:
"file:///usr/share/webbrowser-app/Downloader.qml:22:1: module "Ubuntu.DownloadManager" is not installed"

I think I'm missing again some package, any idea?
Thanks

[Alessandro Viprati (vipri-alessandro)]

Installed the package 'qtdeclarative5-ubuntu-download-manager0.1'.
Now I don't get anymore outputs regarding missing modules, however I'm still not able to upload files.

I still get the previous message #3

webapp-container --name='Wiki di Ubuntu-it' --enable-back-forward --store-session-cookies --open-external-url-in-overlay --app-id=ubuntu-it-wiki --webappUrlPatterns=http://wiki.ubuntu-it.org/*,https://login.ubuntu.com/* http://wiki.ubuntu-it.org/Documentazione/Indice
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
Setting session cookie mode to "restored"
qml: Loading webview on /home/alessandro/.local/share/ubuntu-it-wiki
Invalid webapp webapp definition: homepage not found or fails predicate isString
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
QQmlExpression: Expression file:///usr/share/webbrowser-app/webcontainer/WebApp.qml:272:25 depends on non-NOTIFYable properties:
    unity::action::qml::ActionManager::globalContext
qml: Loaded 5 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-mobile.js
qml: Start browsing
qml: Loaded 5 UA override(s) from file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Web/ua-overrides-desktop.js
[0923/113740:ERROR:layer_tree_host_impl.cc(2250)] Forcing zero-copy tile initialization as worker context is missing
TouchSelectionController::active is deprecated, use TouchSelectionController::status instead

[Olivier Tilloy (osomon)]

You’re missing the following package: qtdeclarative5-ubuntu-download-manager0.1

But that’s not going to solve the lack of apps that provide this kind of content.
Because the webapp container is running confined, it cannot just offer a file picker that would allow browsing the file system. Instead, it relies on applications that act as content providers, to pick content from. For example the gallery-app package can provide images. For all types of file, you want the ubuntu-filemanager-app, but it doesn’t appear to exist as a debian package, only as click.

[Alessandro Viprati (vipri-alessandro)]

Thanks Olivier for your time and patience, I really appreciate.

Just installed the gallery-app package, but it isn't listed as content provider in the webapp-container nor in other webapps (g+, facebookmessenger...).
An image picker could be enought for a wiki webapp (essentially the majority of files uploaded in the italian wiki by users are images). If I need different types of files, I'll look to the ubuntu-filemanager-app, however first I need that webapp-container can see these apps.

Any idea on how to archieve this?
If ther's some kind of documentation I can read, please send me links.