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website/integrations: add notice for google source and username 

closes #3709 closes #4432

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
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Jens Langhammer 2023-01-27 15:10:46 +01:00
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website/integrations/sources/google/index.md
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@ -81,3 +81,22 @@ Save, and you now have Google as a source.
:::note
For more details on how-to have the new source display on the Login Page see [here](../general#add-sources-to-default-login-page).
:::
## Username mapping
Since google does not have the concept of a username, authentik will by default prompt the user for a username when they first enroll through a google source. To change this behaviour and automatically use the email address as username, create an expression policy to set the username to the email, and bind it to the enrollment flow.
Create an expression policy with this expression:
```python
email = request.context["prompt_data"]["email"]
# Direct set username to email
request.context["prompt_data"]["username"] = email
# Set username to email without domain
# request.context["prompt_data"]["username"] = email.split("@")[0]
return True
```
Afterwards, edit the source's enrollment flow (by default _default-source-enrollment_), expand the policies bound to the first stage (_default-source-enrollment-prompt_), and bind the policy created above. Afterwards, any new logins will automatically have their google email address used as their username.
This can be combined with disallowing users from changing their usernames, see [Configuration](../../../docs/installation/configuration#authentik_default_user_change_username).