Sort by EXIF 'taken' date

[ghost]

Fixes: #51

Licence: AGPL

Description

Attempts to implement new feature: sort by EXIF 'taken' date; new button added to the interface -
switches sortType to date-taken, causes the files to be sorted by their exif.taken_date properties.

Features

• new button for sorting by EXIF 'taken' date
• improved JS code for supporting new sortTypes
• FilesService.php improvements
  • getNodeData() return value has new exif attribute;
  • new method getEXIF() for retrieving specific EXIF data
    • taken_date attribute (UNIX timestamp) maps to DateTimeOriginal EXIF field; defaults to 0.

Screenshots or screencasts

screencast

Caveats

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Tests

Test plan

Update Gallery app, launch Nextcloud, navigate to Gallery, open any album, click on Sort by EXIF taken date button (next to the Sort by modified date button); the ordering should change depending on each photo's exif.taken_date property.

Tested on

• Windows/Opera
• Windows/Firefox
• Android 6.1/Chrome

TODO

• Optimize backend code through caching (Redis, MySQL)

Check list

• Code is properly documented
• Code is properly formatted
• Commits have been squashed
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required

Reviewers

@oparoz, @jancborchardt

[ghost]

@oparoz What can I do about the failed SignInAsUserCept test?

[jancborchardt]

A code review please :) @rullzer @MorrisJobke @lcalaresu @irgendwie @skjnldsv

[oparoz]

@oparoz What can I do about the failed SignInAsUserCept test?

You can open another PR if you want, the CSS for the menu item has changed, so the acceptance test fails.

[patman15]

Since my name is mentioned under "Reviewers", I'm too far away from the project to provide reasonable feedback. I can test if you want. Let me know if "easy" tasks are required I would support that.

[oparoz]

Regarding this PR, my biggest issue is that the information is never saved, which will lead to a performance hit, which should be measured.

I think a better option is still to have some form of meta data extraction being performed at upload time and it should be a core functionality of the server since it isn't only useful for images, but lots of other file types.

[jancborchardt]

Then we should continue in the core issue at nextcloud/server#5106 ?

[oparoz]

Correct. And once EXIF data is available via an API, then we can re-activate this PR and create lots of fun others :)

[jancborchardt]

Closing then as we should work on this in core as commented. @denim2x let’s continue in the core issue at nextcloud/server#5106 🙂

Please also note that we will likely focus our efforts on the upcoming grid view of Files rather than Gallery.