[Documentation] Request: Document self-hosting with Google App Engine

[techbudfl]

Would be useful to document procedures required if a duplicati user wants to self-host the oauth-handler.

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[kenkendk]

You need to do a few steps:

1. Change the app name:
   https://github.com/duplicati/oauth-handler/blob/master/app.yaml#L1
   (Newer versions of the GAE SDK requires that you supply it on the commandline, and not in the file).

2. Copy config-template.txt to config.txt:
   https://github.com/duplicati/oauth-handler/blob/master/config-template.py

3. In the new config.txt, register for each service you want to support and obtain the secret values (make sure you do NOT edit config-template.txt:
   https://github.com/duplicati/oauth-handler/blob/master/config-template.py#L50

4. Upload to GAE

[A-Frantyk]

I tried to do everything that was described above, but got this error when trying do connect for example to Google Drive:
1.

2. When pressing on this button I'm getting this error:

What I did wrong? I registered the app and added Client id and secret but still have this error?

[kenkendk]

You need to change the redirect url on the Google OAuth setup page to point to https://<service>.appspot.com/logged-in

More details:
https://developers.google.com/actions/identity/oauth2-code-flow

[tachang]

How do you change this here on the server?

https://github.com/duplicati/duplicati/blob/cda96257dc3d22bbcf34e13f48138a4e2398044f/Duplicati/Library/Backend/OAuthHelper/OAuthHelper.cs#L69

[kenkendk]

@tachang sorry for the late reply, but the answer is that you simply need to tell Duplicati to use another url with the commandline/advanced option --oauth-url=https://.../refresh