breaking up config docs into sections

Signed-off-by: Claudius <opensource@amenthes.de>

2 files changed, 292 insertions, 76 deletions

diff --git a/docs/configuration-config-file.md b/docs/configuration-config-file.md
index bc9c19e3..41122aa1 100644
--- a/docs/configuration-config-file.md
+++ b/docs/configuration-config-file.md
@@ -4,62 +4,144 @@ Configuration Using Config file
 You can choose to configure CodiMD with either a config file or with 
 [environment variables](configuration-env-vars.md). The config file is processed
 in [`lib/config/index.js`](lib/config/index.js) - so this is the first
-place to look if anything is missing not obvious from this document.
+place to look if anything is missing not obvious from this document. The
+default values are defined in [`lib/config/default.js`](lib/config/default.js),
+in case you wonder if you even need to override it.
 
 Environment variables take precedence over configurations from the config files.
 To get started, it is a good idea to take the `config.json.example` and copy it
 to `config.json` before filling in your own details.
 
-[//]: # (TODO split up into chunks)
 
+## Node.JS
 
 | variables | example values | description |
 | --------- | ------ | ----------- |
 | `debug` | `true` or `false` | set debug mode, show more logs |
+
+
+## CodiMD basics
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
+| `allowPDFExport` | `true` | Whether or not PDF export is offered. |
+| `db` | `{ "dialect": "sqlite", "storage": "./db.codimd.sqlite" }` | set the db configs, [see more here](http://sequelize.readthedocs.org/en/latest/api/sequelize/) |
+| `dbURL` | `mysql://localhost:3306/database` | set the db URL; if set, then db config (below) won't be applied |
+| `forbiddenNoteIDs` | `['robots.txt']` | disallow creation of notes, even if `allowFreeUrl` is `true` |
+| `loglevel` | `info` | Defines what kind of logs are provided to stdout. |
+| `imageUploadType` | `imgur`, `s3`, `minio`, `azure` or `filesystem`(default) | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md)|
+| `sourceURL` | `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) |
+| `staticCacheTime` | `1 * 24 * 60 * 60 * 1000` | static file cache time |
+| `heartbeatInterval` | `5000` | socket.io heartbeat interval |
+| `heartbeatTimeout` | `10000` | socket.io heartbeat timeout |
+| `documentMaxLength` | `100000` | note max length |
+
+
+## CodiMD paths stuff
+
+these are rarely used for various reasons.
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
+| `defaultNotePath` | `./public/default.md` | default note file path<sup>1</sup>, empty notes will be created with this template. |
+| `dhParamPath` | `./cert/dhparam.pem` | SSL dhparam path<sup>1</sup> (only need when you set `useSSL`) |
+| `sslCAPath` | `['./cert/COMODORSAAddTrustCA.crt']` | SSL ca chain<sup>1</sup> (only need when you set `useSSL`) |
+| `sslCertPath` | `./cert/codimd_io.crt` | SSL cert path<sup>1</sup> (only need when you set `useSSL`) |
+| `sslKeyPath` | `./cert/client.key` | SSL key path<sup>1</sup> (only need when you set `useSSL`) |
+| `tmpPath` | `./tmp/` | temp directory path<sup>1</sup> |
+| `docsPath` | `./public/docs` | docs directory path<sup>1</sup> |
+| `viewPath` | `./public/views` | template directory path<sup>1</sup> |
+| `uploadsPath` | `./public/uploads` | uploads directory<sup>1</sup> - needs to be persistent when you use imageUploadType `filesystem` |
+
+
+## CodiMD Location
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
 | `domain` | `localhost` | domain name |
 | `urlPath` | `codimd` | sub URL path, like `www.example.com/<urlpath>` |
-| `host` | `localhost` | host to listen on |
-| `port` | `80` | web app port |
+| `host` | `localhost` | interface/ip to listen on |
+| `port` | `80` | port to listen on |
 | `path` | `/var/run/codimd.sock` | path to UNIX domain socket to listen on (if specified, `host` and `port` are ignored) |
-| `loglevel` | `info` | Defines what kind of logs are provided to stdout. |
-| `allowOrigin` | `['localhost']` | domain name whitelist |
+| `protocolUseSSL` | `true` or `false` | set to use SSL protocol for resources path (only applied when domain is set) |
 | `useSSL` | `true` or `false` | set to use SSL server (if `true`, will auto turn on `protocolUseSSL`) |
+| `urlAddPort` | `true` or `false` | set to add port on callback URL (ports `80` or `443` won't be applied) (only applied when domain is set) |
+| `allowOrigin` | `['localhost']` | domain name whitelist |
+
+
+## CSP and HSTS
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
 | `hsts` | `{"enable": true, "maxAgeSeconds": 31536000, "includeSubdomains": true, "preload": true}` | [HSTS](https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security) options to use with HTTPS (default is the example value, max age is a year) |
 | `csp` | `{"enable": true, "directives": {"scriptSrc": "trustworthy-scripts.example.com"}, "upgradeInsecureRequests": "auto", "addDefaults": true}` | Configures [Content Security Policy](https://helmetjs.github.io/docs/csp/). Directives are passed to Helmet - see [their documentation](https://helmetjs.github.io/docs/csp/) for more information on the format. Some defaults are added to the configured values so that the application doesn't break. To disable this behaviour, set `addDefaults` to `false`. Further, if `usecdn` is on, some CDN locations are allowed too. By default (`auto`), insecure (HTTP) requests are upgraded to HTTPS via CSP if `useSSL` is on. To change this behaviour, set `upgradeInsecureRequests` to either `true` or `false`. |
-| `protocolUseSSL` | `true` or `false` | set to use SSL protocol for resources path (only applied when domain is set) |
-| `urlAddPort` | `true` or `false` | set to add port on callback URL (ports `80` or `443` won't be applied) (only applied when domain is set) |
+
+## Privacy and External Requests
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
+| `allowGravatar` | `true` or `false` | set to `false` to disable gravatar as profile picture source on your instance |
 | `useCDN` | `true` or `false` | set to use CDN resources or not (default is `true`) |
+
+## Users and Privileges
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
 | `allowAnonymous` | `true` or `false` | set to allow anonymous usage (default is `true`) |
 | `allowAnonymousEdits` | `true` or `false` | if `allowAnonymous` is `true`: allow users to select `freely` permission, allowing guests to edit existing notes (default is `false`) |
 | `allowFreeURL` | `true` or `false` | set to allow new note creation by accessing a nonexistent note URL |
-| `forbiddenNoteIDs` | `['robots.txt']` | disallow creation of notes, even if `allowFreeUrl` is `true` |
 | `defaultPermission` | `freely`, `editable`, `limited`, `locked`, `protected` or `private` | set notes default permission (only applied on signed users) |
-| `dbURL` | `mysql://localhost:3306/database` | set the db URL; if set, then db config (below) won't be applied |
-| `db` | `{ "dialect": "sqlite", "storage": "./db.codimd.sqlite" }` | set the db configs, [see more here](http://sequelize.readthedocs.org/en/latest/api/sequelize/) |
-| `sslKeyPath` | `./cert/client.key` | SSL key path<sup>1</sup> (only need when you set `useSSL`) |
-| `sslCertPath` | `./cert/codimd_io.crt` | SSL cert path<sup>1</sup> (only need when you set `useSSL`) |
-| `sslCAPath` | `['./cert/COMODORSAAddTrustCA.crt']` | SSL ca chain<sup>1</sup> (only need when you set `useSSL`) |
-| `dhParamPath` | `./cert/dhparam.pem` | SSL dhparam path<sup>1</sup> (only need when you set `useSSL`) |
-| `tmpPath` | `./tmp/` | temp directory path<sup>1</sup> |
-| `defaultNotePath` | `./public/default.md` | default note file path<sup>1</sup> |
-| `docsPath` | `./public/docs` | docs directory path<sup>1</sup> |
-| `viewPath` | `./public/views` | template directory path<sup>1</sup> |
-| `uploadsPath` | `./public/uploads` | uploads directory<sup>1</sup> - needs to be persistent when you use imageUploadType `filesystem` |
 | `sessionName` | `connect.sid` | cookie session name |
-| `sessionSecret` | `secret` | cookie session secret |
 | `sessionLife` | `14 * 24 * 60 * 60 * 1000` | cookie session life |
-| `staticCacheTime` | `1 * 24 * 60 * 60 * 1000` | static file cache time |
-| `heartbeatInterval` | `5000` | socket.io heartbeat interval |
-| `heartbeatTimeout` | `10000` | socket.io heartbeat timeout |
-| `documentMaxLength` | `100000` | note max length |
+| `sessionSecret` | `secret` | cookie session secret | If none is set, one will randomly generated on each startup, meaning all your users will be logged out. |
+
+
+## Login methods
+
+Most of these have never been documented for the config.json, feel free to expand these
+
+### Email (local account)
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
 | `email` | `true` or `false` | set to allow email signin |
-| `oauth2` | `{baseURL: ..., userProfileURL: ..., userProfileUsernameAttr: ..., userProfileDisplayNameAttr: ..., userProfileEmailAttr: ..., tokenURL: ..., authorizationURL: ..., clientID: ..., clientSecret: ...}` | An object detailing your OAuth2 provider. Refer to the [Mattermost](docs/guides/auth/mattermost-self-hosted.md) or [Nextcloud](docs/guides/auth/nextcloud.md) examples for more details!|
 | `allowEmailRegister`  | `true` or `false` | set to allow email register (only applied when email is set, default is `true`. Note `bin/manage_users` might help you if registration is `false`.) |
-| `allowGravatar` | `true` or `false` | set to `false` to disable gravatar as profile picture source on your instance |
-| `imageUploadType` | `imgur`, `s3`, `minio`, `azure` or `filesystem`(default) | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md)|
-| `minio` | `{ "accessKey": "YOUR_MINIO_ACCESS_KEY", "secretKey": "YOUR_MINIO_SECRET_KEY", "endpoint": "YOUR_MINIO_HOST", port: 9000, secure: true }` | When `imageUploadType` is set to `minio`, you need to set this key. Also checkout our [Minio Image Upload Guide](docs/guides/minio-image-upload.md) |
+
+### Dropbox Login
+### Facebook Login
+### GitHub Login
+### GitLab Login
+### Google Login
+### LDAP Login
+### Mattermost Login
+### OAuth2 Login
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
+| `oauth2` | `{baseURL: ..., userProfileURL: ..., userProfileUsernameAttr: ..., userProfileDisplayNameAttr: ..., userProfileEmailAttr: ..., tokenURL: ..., authorizationURL: ..., clientID: ..., clientSecret: ...}` | An object detailing your OAuth2 provider. Refer to the [Mattermost](docs/guides/auth/mattermost-self-hosted.md) or [Nextcloud](docs/guides/auth/nextcloud.md) examples for more details!|
+
+### SAML Login
+### Twitter Login
+
+
+## Upload Storage
+
+Most of these have never been documented for the config.json, feel free to expand these
+
+
+### Amazon S3
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
 | `s3` | `{ "accessKeyId": "YOUR_S3_ACCESS_KEY_ID", "secretAccessKey": "YOUR_S3_ACCESS_KEY", "region": "YOUR_S3_REGION" }` | When `imageuploadtype` be set to `s3`, you would also need to setup this key, check our [S3 Image Upload Guide](docs/guides/s3-image-upload.md) |
 | `s3bucket` | `YOUR_S3_BUCKET_NAME` | bucket name when `imageUploadType` is set to `s3` or `minio` |
-| `sourceURL` | `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) |
+
+### Azure Blob Storage
+### imgur
+### Minio
+
+| variables | example values | description |
+| --------- | ------ | ----------- |
+| `minio` | `{ "accessKey": "YOUR_MINIO_ACCESS_KEY", "secretKey": "YOUR_MINIO_SECRET_KEY", "endpoint": "YOUR_MINIO_HOST", port: 9000, secure: true }` | When `imageUploadType` is set to `minio`, you need to set this key. Also checkout our [Minio Image Upload Guide](docs/guides/minio-image-upload.md) |
 
 <sup>1</sup>: relative paths are based on CodiMD's base directory
diff --git a/docs/configuration-env-vars.md b/docs/configuration-env-vars.md
index aa70b95d..55107367 100644
--- a/docs/configuration-env-vars.md
+++ b/docs/configuration-env-vars.md
@@ -5,56 +5,141 @@ You can choose to configure CodiMD with either a
 [config file](configuration-config-file.md) or with environment variables.
 Environment variables are processed in
 [`lib/config/environment.js`](lib/config/environment.js) - so this is the first
-place to look if anything is missing not obvious from this document.
+place to look if anything is missing not obvious from this document. The
+default values are defined in [`lib/config/default.js`](lib/config/default.js),
+in case you wonder if you even need to override it.
 
 Environment variables take precedence over configurations from the config files.
 They generally start with `CMD_` for our own options, but we also list
 node-specific options you can configure this way.
 
-[//]: # (TODO split up into chunks)
 
+## Node.JS
 
-| variable | example value | description | default |
-| -------- | ------------- | ----------- | ------- |
-| `NODE_ENV`  | `production` or `development` | set current environment (will apply corresponding settings in the `config.json`) |
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `NODE_ENV` | `production` or `development` | set current environment (will apply corresponding settings in the `config.json`) |
 | `DEBUG` | `true` or `false` | set debug mode; show more logs |
+
+
+## CodiMD basics
+
+defaultNotePath can't be set from env-vars
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_ALLOW_PDF_EXPORT` | `true` or `false` | Enable or disable PDF exports |
 | `CMD_CONFIG_FILE` | `/path/to/config.json` | optional override for the path to CodiMD's config file |
+| `CMD_DB_URL` | `mysql://localhost:3306/database` | set the database URL |
+| `CMD_LOGLEVEL` | `info`, `debug` ... | Defines what kind of logs are provided to stdout. |
+| `CMD_FORBIDDEN_NOTE_IDS` | `'robots.txt'` | disallow creation of notes, even if `CMD_ALLOW_FREEURL` is `true` |
+| `CMD_IMAGE_UPLOAD_TYPE` | `imgur`, `s3`, `minio` or `filesystem` | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/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) |
+
+
+## CodiMD Location
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_DOMAIN` | `codimd.org` | domain name |
-| `CMD_URL_PATH` | `codimd` | sub URL path, like `www.example.com/<URL_PATH>` |
-| `CMD_HOST` | `localhost` | host to listen on |
-| `CMD_PORT` | `80` | web app port |
+| `CMD_URL_PATH` | `codimd` | If CodiMD is run from a subdirectory like `www.example.com/<urlpath>` |
+| `CMD_HOST` | `localhost` | interface/ip to listen on |
+| `CMD_PORT` | `80` | port to listen on |
 | `CMD_PATH` | `/var/run/codimd.sock` | path to UNIX domain socket to listen on (if specified, `CMD_HOST` and `CMD_PORT` are ignored) |
-| `CMD_LOGLEVEL` | `info` | Defines what kind of logs are provided to stdout. |
-| `CMD_ALLOW_ORIGIN` | `localhost, codimd.org` | domain name whitelist (use comma to separate) |
 | `CMD_PROTOCOL_USESSL` | `true` or `false` | set to use SSL protocol for resources path (only applied when domain is set) |
 | `CMD_URL_ADDPORT` | `true` or `false` | set to add port on callback URL (ports `80` or `443` won't be applied) (only applied when domain is set) |
-| `CMD_USECDN` | `true` or `false` | set to use CDN resources or not (default is `true`) |
+| `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) |
+
+
+## Privacy and External Requests
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_ALLOW_GRAVATAR` | `true` or `false` | set to `false` to disable gravatar as profile picture source on your instance |
+| `CMD_USECDN` | `true` or `false` | set to use CDN resources or not|
+
+
+## Users and Privileges
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `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 |
-| `CMD_FORBIDDEN_NODE_IDS` | `'robots.txt'` | disallow creation of notes, even if `CMD_ALLOW_FREEURL` is `true` |
 | `CMD_DEFAULT_PERMISSION` | `freely`, `editable`, `limited`, `locked` or `private` | set notes default permission (only applied on signed users) |
-| `CMD_DB_URL` | `mysql://localhost:3306/database` | set the database URL |
-| `CMD_SESSION_SECRET` | no example | Secret used to sign the session cookie. If non is set, one will randomly generated on startup |
 | `CMD_SESSION_LIFE` | `1209600000` | Session life time. (milliseconds) |
+| `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. |
+
+
+## Login methods
+
+### Email (local account)
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_EMAIL` | `true` or `false` | set to allow email signin |
+| `CMD_ALLOW_EMAIL_REGISTER` | `true` or `false` | set to allow email register (only applied when email is set, default is `true`. Note `bin/manage_users` might help you if registration is `false`.) |
+
+
+### Dropbox Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_DROPBOX_CLIENTID` | no example | Dropbox API client id |
+| `CMD_DROPBOX_CLIENTSECRET` | no example | Dropbox API client secret |
+
+
+### Facebook Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_FACEBOOK_CLIENTID` | no example | Facebook API client id |
 | `CMD_FACEBOOK_CLIENTSECRET` | no example | Facebook API client secret |
-| `CMD_TWITTER_CONSUMERKEY` | no example | Twitter API consumer key |
-| `CMD_TWITTER_CONSUMERSECRET` | no example | Twitter API consumer secret |
+
+
+### GitHub Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_GITHUB_CLIENTID` | no example | GitHub API client id |
 | `CMD_GITHUB_CLIENTSECRET` | no example | GitHub API client secret |
+
+
+### GitLab Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_GITLAB_SCOPE` | `read_user` or `api` | GitLab API requested scope (default is `api`) (GitLab snippet import/export need `api` scope) |
 | `CMD_GITLAB_BASEURL` | no example | GitLab authentication endpoint, set to use other endpoint than GitLab.com (optional) |
 | `CMD_GITLAB_CLIENTID` | no example | GitLab API client id |
 | `CMD_GITLAB_CLIENTSECRET` | no example | GitLab API client secret |
 | `CMD_GITLAB_VERSION` | no example | GitLab API version (v3 or v4) |
-| `CMD_MATTERMOST_BASEURL` | no example | Mattermost authentication endpoint for versions below 5.0. For Mattermost version 5.0 and above, see [guide](docs/guides/auth/mattermost-self-hosted.md). |
-| `CMD_MATTERMOST_CLIENTID` | no example | Mattermost API client id |
-| `CMD_MATTERMOST_CLIENTSECRET` | no example | Mattermost API client secret |
-| `CMD_DROPBOX_CLIENTID` | no example | Dropbox API client id |
-| `CMD_DROPBOX_CLIENTSECRET` | no example | Dropbox API client secret |
+
+
+### Google Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_GOOGLE_CLIENTID` | no example | Google API client id |
 | `CMD_GOOGLE_CLIENTSECRET` | no example | Google API client secret |
+
+
+### LDAP Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_LDAP_URL` | `ldap://example.com` | URL of LDAP server |
 | `CMD_LDAP_BINDDN` | no example | bindDn for LDAP access |
 | `CMD_LDAP_BINDCREDENTIALS` | no example | bindCredentials for LDAP access |
@@ -65,16 +150,21 @@ node-specific options you can configure this way.
 | `CMD_LDAP_USERNAMEFIELD` | Fallback to userid | The LDAP field which is used as the username on CodiMD |
 | `CMD_LDAP_TLS_CA` | `server-cert.pem, root.pem` | Root CA for LDAP TLS in PEM format (use comma to separate) |
 | `CMD_LDAP_PROVIDERNAME` | `My institution` | Optional name to be displayed at login form indicating the LDAP provider |
-| `CMD_SAML_IDPSSOURL` | `https://idp.example.com/sso` | authentication endpoint of IdP. for details, see [guide](docs/guides/auth/saml-onelogin.md). |
-| `CMD_SAML_IDPCERT` | `/path/to/cert.pem` | certificate file path of IdP in PEM format |
-| `CMD_SAML_ISSUER` | no example | identity of the service provider (optional, default: serverurl)" |
-| `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` | `Hackmd-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) |
+
+
+### Mattermost Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_MATTERMOST_BASEURL` | no example | Mattermost authentication endpoint for versions below 5.0. For Mattermost version 5.0 and above, see [guide](docs/guides/auth/mattermost-self-hosted.md). |
+| `CMD_MATTERMOST_CLIENTID` | no example | Mattermost API client id |
+| `CMD_MATTERMOST_CLIENTSECRET` | no example | Mattermost API client secret |
+
+
+### OAuth2 Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_OAUTH2_USER_PROFILE_URL` | `https://example.com` | where retrieve information about a user after succesful login. Needs to output JSON. (no default value) Refer to the [Mattermost](docs/guides/auth/mattermost-self-hosted.md) or [Nextcloud](docs/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) |
@@ -84,30 +174,74 @@ node-specific options you can configure this way.
 | `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_IMGUR_CLIENTID` | no example | Imgur API client id |
-| `CMD_EMAIL` | `true` or `false` | set to allow email signin |
-| `CMD_ALLOW_PDF_EXPORT` | `true` or `false` | Enable or disable PDF exports |
-| `CMD_ALLOW_EMAIL_REGISTER` | `true` or `false` | set to allow email register (only applied when email is set, default is `true`. Note `bin/manage_users` might help you if registration is `false`.) |
-| `CMD_ALLOW_GRAVATAR` | `true` or `false` | set to `false` to disable gravatar as profile picture source on your instance |
-| `CMD_IMAGE_UPLOAD_TYPE` | `imgur`, `s3`, `minio` or `filesystem` | Where to upload images. For S3, see our Image Upload Guides for [S3](docs/guides/s3-image-upload.md) or [Minio](docs/guides/minio-image-upload.md) |
+
+
+### SAML Login
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_SAML_IDPSSOURL` | `https://idp.example.com/sso` | authentication endpoint of IdP. for details, see [guide](docs/guides/auth/saml-onelogin.md). |
+| `CMD_SAML_IDPCERT` | `/path/to/cert.pem` | certificate file path of IdP in PEM format |
+| `CMD_SAML_ISSUER` | no example | identity of the service provider (optional, default: serverurl)" |
+| `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
+you don't have to use either of these.
+
+
+### Amazon S3
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_S3_ACCESS_KEY_ID` | no example | AWS access key id |
 | `CMD_S3_SECRET_ACCESS_KEY` | no example | AWS secret key |
 | `CMD_S3_REGION` | `ap-northeast-1` | AWS S3 region |
 | `CMD_S3_BUCKET` | no example | AWS S3 bucket name |
+
+
+### Azure Blob Storage
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_AZURE_CONNECTION_STRING` | no example | Azure Blob Storage connection string |
+| `CMD_AZURE_CONTAINER` | no example | Azure Blob Storage container name (automatically created if non existent) |
+
+
+### imgur
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
+| `CMD_IMGUR_CLIENTID` | no example | Imgur API client id |
+
+
+### Minio
+
+| variable | example value | description |
+| -------- | ------------- | ----------- |
 | `CMD_MINIO_ACCESS_KEY` | no example | Minio access key |
 | `CMD_MINIO_SECRET_KEY` | no example | Minio secret key |
 | `CMD_MINIO_ENDPOINT` | `minio.example.org` | Address of your Minio endpoint/instance |
 | `CMD_MINIO_PORT` | `9000` | Port that is used for your Minio instance |
 | `CMD_MINIO_SECURE` | `true` | If set to `true` HTTPS is used for Minio |
-| `CMD_AZURE_CONNECTION_STRING` | no example | Azure Blob Storage connection string |
-| `CMD_AZURE_CONTAINER` | no example | Azure Blob Storage container name (automatically created if non existent) |
-| `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_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_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) |
+
 
 **Note:** *Due to the rename process we renamed all `HMD_`-prefix variables to be `CMD_`-prefixed. The old ones continue to work.*