exoplayer-core missing upon build

[ghost]

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

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Bug description

Unable to build using Android Studio due exoplayer dependencies missing.

Steps to reproduce

• Merge new changes within Android Studio (been doing this for months)
• Process does not complete at Configure build stage

Device info

Microsoft Windows 10 Professional
Android Studio 3.2.1

Issue

I am being presented with a lot of exoplayer dependencies missing when trying to build Signal.
Could not find com.google.android.exoplayer:exoplayer-core:2.9.1.

When I try browsing to one of the below links (from the log file) I am presented with a 404 Not Found page.
https://repo1.maven.org/maven2/com/google/android/exoplayer/exoplayer-core/2.9.1/exoplayer-core-2.9.1.pom
https://raw.github.com/signalapp/maven/master/preferencefragment/releases/com/google/android/exoplayer/exoplayer-core/2.9.1/exoplayer-core-2.9.1.pom

Is this a known issue? How do I download exoplayer and add to my Android Studio installation?

Thanks

[greyson-signal]

We build the app with a publicly-available docker image (see the reproducible build guide). This has been working, so you must have something misconfigured locally. Feel free to use the docker image as a guide. For more help, you're encourage to post on the forum. Thanks!

[ghost]

Maybe a potential issue globally as starting a fresh project (new build) also fails.

google/ExoPlayer#5225
flutter/flutter#25145

Apologies if I am mistaken.

[greyson-signal]

Apologies, yeah, looks like Google in general had a fun day today: https://www.reddit.com/r/androiddev/comments/a4wpuk/for_anyone_wondering_about_todays_failed_builds/

In which case all we can do is wait or use one of the several workarounds offered. I'm fortunate that I have all of the artifacts cached locally from previous builds.