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-# Authentication guide - SAML
-
-*Note:* This guide was written before the renaming. Just replace `HackMD` with `HedgeDoc` in your mind :smile: thanks!
-
-The basic procedure is the same as the case of OneLogin which is mentioned in [OneLogin-Guide](./saml-onelogin.md). If you want to match your IdP, you can use more configurations as below.
-
-- If your IdP accepts metadata XML of the service provider to ease configuration, use this url to download metadata XML.
-    - {{your-serverurl}}/auth/saml/metadata
-    - *Note:* If not accessible from IdP, download to local once and upload to IdP.
-
-- Change the value of `issuer`, `identifierFormat` to match your IdP.
-  - `issuer`: A unique id to identify the application to the IdP, which is the base URL of your HedgeDoc as default
-
-  - `identifierFormat`: A format of unique id to identify the user of IdP, which is the format based on email address as default. It is recommend that you use as below.
-    - urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress (default)
-    - urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified
-
-  - `config.json`:
-    ```javascript
-    {
-      "production": {
-        "saml": {
-          /* omitted */
-          "issuer": "myhedgedoc"
-          "identifierFormat": "urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"
-        }
-      }
-    }
-    ```
-
-  - environment variables
-    ```env
-    CMD_SAML_ISSUER=myhedgedoc
-    CMD_SAML_IDENTIFIERFORMAT=urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified
-    ```
-
-- Change mapping of attribute names to customize the displaying user name and email address to match your IdP.
-  - `attribute`: A dictionary to map attribute names
-  
-  - `attribute.id`: A primary key of user table for your HedgeDoc
-  
-  - `attribute.username`: Attribute name of displaying user name on HedgeDoc
-  
-  - `attribute.email`: Attribute name of email address, which will be also used for Gravatar
-    - *Note:* Default value of all attributes is NameID of SAML response, which is email address if `identifierFormat` is default.
-
-  - `config.json`:
-    ```javascript
-    {
-      "production": {
-        "saml": {
-          /* omitted */
-          "attribute": {
-            "id": "sAMAccountName",
-            "username": "displayName",
-            "email": "mail"
-          }
-        }
-      }
-    }
-    ```
-
-  - environment variables
-    ```sh
-    CMD_SAML_ATTRIBUTE_ID=sAMAccountName
-    CMD_SAML_ATTRIBUTE_USERNAME=nickName
-    CMD_SAML_ATTRIBUTE_EMAIL=mail
-    ```
-
-- If you want to control permission by group membership, add group attribute name and required group (allowed) or external group (not allowed).
-  - `groupAttribute`: An attribute name of group membership
-
-  - `requiredGroups`: Group names array for allowed access to HedgeDoc. Use vertical bar to separate for environment variables.
-
-  - `externalGroups`: Group names array for not allowed access to HedgeDoc. Use vertical bar to separate for environment variables.
-    - *Note:* Evaluates `externalGroups` first
-
-  - `config.json`:
-    ```javascript
-    {
-      "production": {
-        "saml": {
-          /* omitted */
-          "groupAttribute": "memberOf",
-          "requiredGroups": [ "hedgedoc-users", "board-members" ],
-          "externalGroups": [ "temporary-staff" ]
-        }
-      }
-    }
-    ```
-
-  - environment variables
-    ```sh
-    CMD_SAML_GROUPATTRIBUTE=memberOf
-    CMD_SAML_REQUIREDGROUPS=hedgedoc-users|board-members
-    CMD_SAML_EXTERNALGROUPS=temporary-staff
-    ```