| `CMD_IMAGE_UPLOAD_TYPE` | `imgur`, `s3`, `minio`, `lutim` or `filesystem` | Where to upload images. For S3, see our Image Upload Guides for [S3](guides/s3-image-upload.md) or [Minio](guides/minio-image-upload.md), also there's a whole section on their respective env vars below. |
| `CMD_SOURCE_URL` | `https://github.com/codimd/server/tree/<current commit>` | Provides the link to the source code of CodiMD on the entry page (Please, make sure you change this when you run a modified version) |
| `CMD_ALLOW_ORIGIN` | `localhost, codimd.org` | domain name whitelist (use comma to separate) |
## CSP and HSTS
| variable | example value | description |
| -------- | ------------- | ----------- |
| `CMD_CSP_ENABLE` | `true` | whether to enable Content Security Policy (directives cannot be configured with environment variables) |
| `CMD_CSP_REPORTURI` | `https://<someid>.report-uri.com/r/d/csp/enforce` | Allows to add a URL for CSP reports in case of violations |
| `CMD_HSTS_ENABLE` | ` true` | set to enable [HSTS](https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security) if HTTPS is also enabled (default is ` true`) |
| `CMD_HSTS_INCLUDE_SUBDOMAINS` | `true` | set to include subdomains in HSTS (default is `true`) |
| `CMD_HSTS_MAX_AGE` | `31536000` | max duration in seconds to tell clients to keep HSTS status (default is a year) |
| `CMD_HSTS_PRELOAD` | `true` | whether to allow preloading of the site's HSTS status (e.g. into browsers) |
| `CMD_ALLOW_GRAVATAR` | `true` or `false` | set to `false` to disable [Libravatar](https://www.libravatar.org/) as profile picture source on your instance. Libravatar is a federated open-source alternative to Gravatar. |
| `CMD_ALLOW_ANONYMOUS` | `true` or `false` | Set to allow anonymous usage (default is `true`). |
| `CMD_ALLOW_ANONYMOUS_EDITS` | `true` or `false` | If `allowAnonymous` is `true`: allow users to select `freely` permission, allowing guests to edit existing notes (default is `false`). |
| `CMD_ALLOW_FREEURL` | `true` or `false` | Set to allow new note creation by accessing a nonexistent note URL. This is the behavior familiar from [Etherpad](https://github.com/ether/etherpad-lite). |
| `CMD_DEFAULT_PERMISSION` | `freely`, `editable`, `limited`, `locked`, `protected` or `private` | Set notes default permission (only applied on signed-in users). |
| `CMD_SESSION_SECRET` | no example | Secret used to sign the session cookie. If none is set, one will randomly generated on each startup, meaning all your users will be logged out. |
| `CMD_ALLOW_EMAIL_REGISTER` | `true` or `false` | Set to allow registration of new accounts using an email address. If set to `false`, you can still create accounts using the command line - see `bin/manage_users` for details (In production mode, remember to run it with `NODE_ENV` set as `production` in the enviroment). This setting has no effect if `CMD_EMAIL` is `false`. The default for `CMD_ALLOW_EMAIL_REGISTER` is `true`. |
| `CMD_MATTERMOST_BASEURL` | no example | Mattermost authentication endpoint for versions below 5.0. For Mattermost version 5.0 and above, see [guide](guides/auth/mattermost-self-hosted.md). |
| `CMD_OAUTH2_USER_PROFILE_URL` | `https://example.com` | Where to retrieve information about a user after successful login. Needs to output JSON. (no default value) Refer to the [Mattermost](guides/auth/mattermost-self-hosted.md) or [Nextcloud](guides/auth/nextcloud.md) examples for more details on all of the `CMD_OAUTH2...` options. |
| `CMD_OAUTH2_USER_PROFILE_USERNAME_ATTR` | `name` | where to find the username in the JSON from the user profile URL. (no default value)|
| `CMD_OAUTH2_USER_PROFILE_DISPLAY_NAME_ATTR` | `display-name` | where to find the display-name in the JSON from the user profile URL. (no default value) |
| `CMD_OAUTH2_USER_PROFILE_EMAIL_ATTR` | `email` | where to find the email address in the JSON from the user profile URL. (no default value) |
| `CMD_OAUTH2_TOKEN_URL` | `https://example.com` | sometimes called token endpoint, please refer to the documentation of your OAuth2 provider (no default value) |
| `CMD_OAUTH2_AUTHORIZATION_URL` | `https://example.com` | authorization URL of your provider, please refer to the documentation of your OAuth2 provider (no default value) |
| `CMD_OAUTH2_CLIENT_ID` | `afae02fckafd...` | you will get this from your OAuth2 provider when you register CodiMD as OAuth2-client, (no default value) |
| `CMD_OAUTH2_CLIENT_SECRET` | `afae02fckafd...` | you will get this from your OAuth2 provider when you register CodiMD as OAuth2-client, (no default value) |
| `CMD_OAUTH2_PROVIDERNAME` | `My institution` | Optional name to be displayed at login form indicating the oAuth2 provider |
| `CMD_SAML_IDENTIFIERFORMAT` | no example | name identifier format (optional, default: `urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress`) |
| `CMD_SAML_GROUPATTRIBUTE` | `memberOf` | attribute name for group list (optional) |
| `CMD_SAML_REQUIREDGROUPS` | `codimd-users` | group names that allowed (use vertical bar to separate) (optional) |
| `CMD_SAML_EXTERNALGROUPS` | `Temporary-staff` | group names that not allowed (use vertical bar to separate) (optional) |
| `CMD_SAML_ATTRIBUTE_ID` | `sAMAccountName` | attribute map for `id` (optional, default: NameID of SAML response) |
| `CMD_SAML_ATTRIBUTE_USERNAME` | `mailNickname` | attribute map for `username` (optional, default: NameID of SAML response) |
| `CMD_SAML_ATTRIBUTE_EMAIL` | `mail` | attribute map for `email` (optional, default: NameID of SAML response if `CMD_SAML_IDENTIFIERFORMAT` is default) |
### Twitter Login
| variable | example value | description |
| -------- | ------------- | ----------- |
| `CMD_TWITTER_CONSUMERKEY` | no example | Twitter API consumer key |
| `CMD_TWITTER_CONSUMERSECRET` | no example | Twitter API consumer secret |
## Upload Storage
These are only relevant when they are also configured in sync with their
`CMD_IMAGE_UPLOAD_TYPE`. Also keep in mind, that `filesystem` is available, so
