codimd/docs/guides/auth/nextcloud.md

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Authentication guide - Nextcloud (self-hosted)
===
*This has been constructed using the [Nextcloud OAuth2 Documentation](https://docs.nextcloud.com/server/14/admin_manual/configuration_server/oauth2.html?highlight=oauth2) combined with [this issue comment on the nextcloud bugtracker](https://github.com/nextcloud/server/issues/5694#issuecomment-314761326).*
This guide uses the generic OAuth2 module for compatibility with Nextcloud 13 and above (this guide has been tested successfully with Nextcloud 14).
1. Sign-in with an administrator account to your Nextcloud server
2. Navigate to the OAuth integration settings: Profile Icon (top right) --> Settings
Then choose Security Settings from the *Administration* part of the list - Don't confuse this with Personal Security Settings, where you would change your personal password!
At the top there's OAuth 2.0-Clients.
![Where to find OAuth2 in Nextcloud](../images/auth/nextcloud-oauth2-1-settings.png)
3. Add your CodiMD instance by giving it a *name* (perhaps CodiMD, but could be anything) and a *Redirection-URI*. The Redirection-URI will be `\<your-codimd-url\>/auth/oauth2/callback`. Click <kbd>Add</kbd>.
![Adding a client to Nextcloud](../images/auth/nextcloud-oauth2-2-client-add.png)
4. You'll now see a line containing a *client identifier* and a *Secret*.
![Successfully added OAuth2-client](../images/auth/nextcloud-oauth2-3-clientid-secret.png)
5. That's it for Nextcloud, the rest is configured in your CodiMD `config.json` or via the `CMD_` environment variables!
6. Add the Client ID and Client Secret to your `config.json` file or pass them as environment variables. Make sure you also replace `<your-nextcloud-domain>` with the right domain name.
* `config.json`:
```javascript
{
"production": {
"oauth2": {
"clientID": "ii4p1u3jz7dXXXXXXXXXXXXXXX",
"clientSecret": "mqzzx6fydbXXXXXXXXXXXXXXXX",
"authorizationURL": "https://<your-nextcloud-domain>/apps/oauth2/authorize",
"tokenURL": "https://<your-nextcloud-domain>/apps/oauth2/api/v1/token",
"userProfileURL": "https://<your-nextcloud-domain>/ocs/v2.php/cloud/user?format=json",
"userProfileUsernameAttr": "ocs.data.id",
"userProfileDisplayNameAttr": "ocs.data.display-name",
"userProfileEmailAttr": "ocs.data.email"
}
}
}
```
* environment variables:
```sh
CMD_OAUTH2_CLIENT_ID=ii4p1u3jz7dXXXXXXXXXXXXXXX
CMD_OAUTH2_CLIENT_SECRET=mqzzx6fydbXXXXXXXXXXXXXXXX
CMD_OAUTH2_AUTHORIZATION_URL=https://<your-nextcloud-domain>/apps/oauth2/authorize
CMD_OAUTH2_TOKEN_URL=https://<your-nextcloud-domain>/apps/oauth2/api/v1/token
CMD_OAUTH2_USER_PROFILE_URL=https://<your-nextcloud-domain>/ocs/v2.php/cloud/user?format=json
CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR=ocs.data.id
CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR=ocs.data.display-name
CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR=ocs.data.email
```