docs: misago oidc (#5024)

This adds Misago integration docs for OpenID Connect.

Co-authored-by: James Elliott <james-d-elliott@users.noreply.github.com>

docs/content/en/integration/openid-connect/misago/index.md

@@ -0,0 +1,110 @@
+---
+title: "Misago"
+description: "Integrating Misago with the Authelia OpenID Connect Provider."
+lead: ""
+date: 2023-03-04T13:20:00+00:00
+draft: false
+images: []
+menu:
+  integration:
+    parent: "openid-connect"
+weight: 620
+toc: true
+community: true
+---
+
+## Tested Versions
+
+-   [Authelia](https://www.authelia.com)
+    -   [v4.37.5](https://github.com/authelia/authelia/releases/tag/v4.37.5)
+-   [Misago](https://github.com/rafalp/Misago)
+    -   [misago-image v0.29.1](https://github.com/tetricky/misago-image/releases/tag/v0.29.1)
+
+## Before You Begin
+
+{{% oidc-common %}}
+
+### Assumptions
+
+This example makes the following assumptions:
+
+* __Application Root URL:__ `https://misago.example.com`
+* __Authelia Root URL:__ `https://auth.example.com`
+* __Client ID:__ `misago`
+* __Client Secret:__ `insecure_secret`
+
+
+## Configuration
+
+### Application
+
+To configure [Misago] to utilize Authelia as an [OpenID Connect 1.0](https://www.authelia.com/integration/openid-connect/introduction/) Provider:
+
+1. Sign in to the [Misago] Admin Panel
+2. Visit `Settings` and click `OAuth 2`
+3. Configure the Following:
+    1. Basic settings:
+        1. Provider name: `authelia`
+        2. Client ID: `misago`
+        3. Client Secret: `insecure_secret`
+    2. Initializing Login:
+        1. Login form URL: `https://auth.example.com/api/oidc/authorization`
+        2. Scopes: `openid profile email`
+    3. Retrieving access token:
+        1. Access token retrieval URL: `https://auth.example.com/api/oidc/token`
+        2. Request method: `POST`
+        3. JSON path to access token: `access_token`
+    4. Retrieving user data:
+        1. User data URL: `https://auth.example.com/api/oidc/userinfo`
+        2. Request method: `GET`
+        3. Access token location: `Query string`
+        4. Access token name: `access_token`
+    5. User JSON mappings:
+        1. User ID path: `sub`
+        2. User name path: `name`
+        3. User e-mail path: `email`
+4. Save the configuration
+
+{{< figure src="misago-step-2.png" alt="Settings" width="736" style="padding-right: 10px" >}}
+
+{{< figure src="misago-step-3-1.png" alt="Basic Settings" width="736" style="padding-right: 10px" >}}
+
+{{< figure src="misago-step-3-2.png" alt="Initializing Login" width="736" style="padding-right: 10px" >}}
+
+{{< figure src="misago-step-3-3.png" alt="Retrieving access token" width="736" style="padding-right: 10px" >}}
+
+{{< figure src="misago-step-3-4.png" alt="Retrieving user data" width="736" style="padding-right: 10px" >}}
+
+{{< figure src="misago-step-3-5.png" alt="User JSON mappings" width="736" style="padding-right: 10px" >}}
+
+### Authelia
+
+The following YAML configuration is an example **Authelia** [client configuration](https://www.authelia.com/configuration/identity-providers/open-id-connect/#clients) for use with [Misago] which will operate with the above example:
+
+```yaml
+    clients:
+      - id: misago
+        secret: '$pbkdf2-sha512$310000$c8p78n7pUMln0jzvd4aK4Q$JNRBzwAo0ek5qKn50cFzzvE9RXV88h1wJn5KGiHrD0YKtZaR/nCb2CJPOsKaPK0hjf.9yHxzQGZziziccp6Yng'  # The digest of 'insecure_secret'.
+        public: false
+        authorization_policy: two_factor
+        scopes:
+          - openid
+          - profile
+          - email
+        redirect_uris:
+          - https://misago.example.com/oauth2/complete/
+        grant_types:
+          - authorization_code
+        response_types:
+          - code
+        response_modes:
+          - query
+        userinfo_signing_algorithm: none
+```
+
+---
+## See Also
+
+-   [Misago] [OAuth 2 Client Configuration guide](https://misago-project.org/t/oauth-2-client-configuration-guide/1147/)
+
+[Misago]: https://misago-project.org/