Docs: Add docs for OpenID Connect configuration

INSTALLING.md

@@ -119,3 +119,7 @@ For example, if your library is split into multiples paths you can edit the `vol
 You can also edit the volume definition to use advanced volume drivers if you need to access smb or network drives. Mounting a drive into your filesystem and binding it in this volume section is also a valid choice (especially for fuse filesystems like cloud drives for example).
 
 Don't forget to **also edit the scanner's volumes** if you edit the transcoder's volume.
+
+# OpenID Connect
+
+Kyoo supports OpenID Connect (OIDC) for authentication. Please refer to the [OIDC.md](OIDC.md) file for more information.

OIDC.md

@@ -0,0 +1,64 @@
+# OpenID Connect
+
+Kyoo supports OpenID Connect (OIDC) for authentication. This allows you to use your existing identity provider to authenticate users in Kyoo.
+
+## Configuration
+
+To enable OIDC, you need to fill the following environment variables in your `.env` file:
+
+```env
+PUBLIC_URL=https://your-kyoo-instance.com
+OIDC_<name>_NAME=<name>
+OIDC_<name>_LOGO=https://url-of-your-logo.com
+OIDC_<name>_CLIENTID=
+OIDC_<name>_SECRET=
+OIDC_<name>_AUTHORIZATION=https://url-of-the-authorization-endpoint-of-the-oidc-service.com/auth
+OIDC_<name>_TOKEN=https://url-of-the-token-endpoint-of-the-oidc-service.com/token
+OIDC_<name>_PROFILE=https://url-of-the-profile-endpoint-of-the-oidc-service.com/userinfo
+OIDC_<name>_SCOPE="email openid profile"
+OIDC_<name>_AUTHMETHOD=ClientSecretBasic
+```
+
+- `PUBLIC_URL` is the URL of your Kyoo instance. This is required for OIDC to work.
+- `<name>` is the name of the OIDC provider. It can be anything you want. This will be the display name of the OIDC provider on the login page.
+- `OIDC_<name>_LOGO` is the URL of the logo of the OIDC provider. It will be displayed on the login page.
+- `OIDC_<name>_CLIENTID` is the client ID of the OIDC provider.
+- `OIDC_<name>_SECRET` is the client secret of the OIDC provider.
+- `OIDC_<name>_AUTHORIZATION` is the URL of the authorization endpoint of the OIDC provider.
+- `OIDC_<name>_TOKEN` is the URL of the token endpoint of the OIDC provider.
+- `OIDC_<name>_PROFILE` is the URL of the profile endpoint of the OIDC provider.
+- `OIDC_<name>_SCOPE` is the scope of the OIDC provider. This is a space-separated list of scopes.
+- `OIDC_<name>_AUTHMETHOD` is the authentication method of the OIDC provider. This can be `ClientSecretBasic` or `ClientSecretPost`.
+
+## Example
+
+### Google OIDC
+
+To enable Google OIDC, please follow the instructions from the [Google Developers](https://developers.google.com/identity/gsi/web/guides/get-google-api-clientid) to create a new project and get the client ID and secret.
+
+When creating the Oauth 2.0 Client ID, make sure to add the following redirect URI: `https://your-kyoo-instance.com/api/auth/logged/google`.
+
+For the authorized JavaScript origins, add `https://your-kyoo-instance.com`.
+
+Then, fill the following environment variables in your `.env` file:
+
+```env
+PUBLIC_URL=https://your-kyoo-instance.com
+OIDC_GOOGLE_NAME=Google
+OIDC_GOOGLE_LOGO=https://logo.clearbit.com/google.com
+OIDC_GOOGLE_CLIENTID=<client-id> # the client ID you got from Google
+OIDC_GOOGLE_SECRET=<client-secret> # the client secret you got from Google
+OIDC_GOOGLE_AUTHORIZATION=https://accounts.google.com/o/oauth2/auth
+OIDC_GOOGLE_TOKEN=https://oauth2.googleapis.com/token
+OIDC_GOOGLE_PROFILE=https://www.googleapis.com/oauth2/v2/userinfo
+OIDC_GOOGLE_SCOPE="email openid profile"
+OIDC_GOOGLE_AUTHMETHOD=ClientSecretPost
+```
+
+### Another OIDC providers
+
+To enable another OIDC provider, just fill the environment variables with the information you got from the provider.
+
+Remember that when `<name>` is `XYZ`, the environment variables should start with `OIDC_XYZ_`.
+
+In that case, the callback URL will be `https://your-kyoo-instance.com/api/auth/logged/xyz`.