Add notes on integrating with Facebook for SSO login. (#9244)

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Add notes on integrating with Facebook for SSO login.

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@ -307,3 +307,46 @@ oidc_providers:
localpart_template: '{{ user.nickname }}'
display_name_template: '{{ user.name }}'
```
### Facebook
Like Github, Facebook provide a custom OAuth2 API rather than an OIDC-compliant
one so requires a little more configuration.
0. You will need a Facebook developer account. You can register for one
[here](https://developers.facebook.com/async/registration/).
1. On the [apps](https://developers.facebook.com/apps/) page of the developer
console, "Create App", and choose "Build Connected Experiences".
2. Once the app is created, add "Facebook Login" and choose "Web". You don't
need to go through the whole form here.
3. In the left-hand menu, open "Products"/"Facebook Login"/"Settings".
* Add `[synapse public baseurl]/_synapse/oidc/callback` as an OAuth Redirect
URL.
4. In the left-hand menu, open "Settings/Basic". Here you can copy the "App ID"
and "App Secret" for use below.
Synapse config:
```yaml
- idp_id: facebook
idp_name: Facebook
idp_brand: "org.matrix.facebook" # optional: styling hint for clients
discover: false
issuer: "https://facebook.com"
client_id: "your-client-id" # TO BE FILLED
client_secret: "your-client-secret" # TO BE FILLED
scopes: ["openid", "email"]
authorization_endpoint: https://facebook.com/dialog/oauth
token_endpoint: https://graph.facebook.com/v9.0/oauth/access_token
user_profile_method: "userinfo_endpoint"
userinfo_endpoint: "https://graph.facebook.com/v9.0/me?fields=id,name,email,picture"
user_mapping_provider:
config:
subject_claim: "id"
display_name_template: "{{ user.name }}"
```
Relevant documents:
* https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow
* Using Facebook's Graph API: https://developers.facebook.com/docs/graph-api/using-graph-api/
* Reference to the User endpoint: https://developers.facebook.com/docs/graph-api/reference/user