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diff --git a/docs/guides/auth.md b/docs/guides/auth.md
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+# Guide - Authentication
+
+### Twitter
+1. Sign-in or sign-up for a Twitter account
+2. Go to the Twitter Application management page [here](https://apps.twitter.com/)
+3. Click on the **Create New App** button to create a new Twitter app:
+
+![create-twitter-app](images/auth/create-twitter-app.png)
+
+4. Fill out the create application form, check the developer agreement box, and click **Create Your Twitter Application**
+
+![register-twitter-application](images/auth/register-twitter-application.png)
+
+*Note: you may have to register your phone number with Twitter to create a Twitter application*
+
+To do this Click your profile icon --> Settings and privacy --> Mobile --> Select Country/region --> Enter phone number --> Click Continue
+
+5. After you receive confirmation that the Twitter application was created, click **Keys and Access Tokens**
+
+![twitter-app-confirmation](images/auth/twitter-app-confirmation.png)
+
+6. Obtain your Twitter Consumer Key and Consumer Secret
+
+![twitter-app-keys](images/auth/twitter-app-keys.png)
+
+7. Add your Consumer Key and Consumer Secret to your config.json file or pass them as environment variables:
+ * config.json:
+ ````javascript
+ {
+ "production": {
+ "twitter": {
+ "consumerKey": "esTCJFXXXXXXXXXXXXXXXXXXX",
+ "consumerSecret": "zpCs4tU86pRVXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+ }
+ }
+ }
+ ````
+ * environment variables:
+ ````
+ HMD_TWITTER_CONSUMERKEY=esTCJFXXXXXXXXXXXXXXXXXXX
+ HMD_TWITTER_CONSUMERSECRET=zpCs4tU86pRVXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+ ````
+
+### GitHub
+1. Sign-in or sign-up for a GitHub account
+2. Navigate to developer settings in your GitHub account [here](https://github.com/settings/developers) and select the "OAuth Apps" tab
+3. Click on the **New OAuth App** button, to create a new OAuth App:
+
+![create-oauth-app](images/auth/create-oauth-app.png)
+
+4. Fill out the new OAuth application registration form, and click **Register Application**
+
+![register-oauth-application-form](images/auth/register-oauth-application-form.png)
+
+*Note: The callback URL is <your-hackmd-url>/auth/github/callback*
+
+5. After successfully registering the application, you'll receive the Client ID and Client Secret for the application
+
+![application-page](images/auth/application-page.png)
+
+6. Add the Client ID and Client Secret to your config.json file or pass them as environment variables
+ * config.json:
+ ````javascript
+ {
+ "production": {
+ "github": {
+ "clientID": "3747d30eaccXXXXXXXXX",
+ "clientSecret": "2a8e682948eee0c580XXXXXXXXXXXXXXXXXXXXXX"
+ }
+ }
+ }
+ ````
+ * environment variables:
+ ````
+ HMD_GITHUB_CLIENTID=3747d30eaccXXXXXXXXX
+ HMD_GITHUB_CLIENTSECRET=2a8e682948eee0c580XXXXXXXXXXXXXXXXXXXXXX
+ ````
+
+### SAML (OneLogin)
+1. Sign-in or sign-up for an OneLogin account. (available free trial for 2 weeks)
+2. Go to the administration page.
+3. Select the **APPS** menu and click on the **Add Apps**.
+
+![onelogin-add-app](images/auth/onelogin-add-app.png)
+
+4. Find "SAML Test Connector (SP)" for template of settings and select it.
+
+![onelogin-select-template](images/auth/onelogin-select-template.png)
+
+5. Edit display name and icons for OneLogin dashboard as you want, and click **SAVE**.
+
+![onelogin-edit-app-name](images/auth/onelogin-edit-app-name.png)
+
+6. After that other tabs will appear, click the **Configuration**, and fill out the below items, and click **SAVE**.
+ * RelayState: The base URL of your hackmd, which is issuer. (last slash is not needed)
+ * ACS (Consumer) URL Validator: The callback URL of your hackmd. (serverurl + /auth/saml/callback)
+ * ACS (Consumer) URL: same as above.
+ * Login URL: login URL(SAML requester) of your hackmd. (serverurl + /auth/saml)
+
+![onelogin-edit-sp-metadata](images/auth/onelogin-edit-sp-metadata.png)
+
+7. The registration is completed. Next, click **SSO** and copy or download the items below.
+ * X.509 Certificate: Click **View Details** and **DOWNLOAD** or copy the content of certificate ....(A)
+ * SAML 2.0 Endpoint (HTTP): Copy the URL ....(B)
+
+![onelogin-copy-idp-metadata](images/auth/onelogin-copy-idp-metadata.png)
+
+8. In your hackmd server, create IdP certificate file from (A)
+9. Add the IdP URL (B) and the Idp certificate file path to your config.json file or pass them as environment variables.
+ * config.json:
+ ````javascript
+ {
+ "production": {
+ "saml": {
+ "idpSsoUrl": "https://*******.onelogin.com/trust/saml2/http-post/sso/******",
+ "idpCert": "/path/to/idp_cert.pem"
+ }
+ }
+ }
+ ````
+ * environment variables
+ ````
+ HMD_SAML_IDPSSOURL=https://*******.onelogin.com/trust/saml2/http-post/sso/******
+ HMD_SAML_IDPCERT=/path/to/idp_cert.pem
+ ````
+10. Try sign-in with SAML from your hackmd sign-in button or OneLogin dashboard (like the screenshot below).
+
+![onelogin-use-dashboard](images/auth/onelogin-use-dashboard.png)
+
+### SAML (Other cases)
+The basic procedure is the same as the case of OneLogin which is mentioned above. 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 configuraion, use this url to download metadata XML.
+ * {{your-serverurl}}/auth/saml/metadata
+ * _Note: If not accessable 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 HackMD 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": "myhackmd"
+ "identifierFormat": "urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"
+ }
+ }
+ }
+ ````
+ * environment variables
+ ````
+ HMD_SAML_ISSUER=myhackmd
+ HMD_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 HackMD
+ * `attribute.username`: Attribute name of displaying user name on HackMD
+ * `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 `idfentifierFormat` is default._
+ * config.json:
+ ````javascript
+ {
+ "production": {
+ "saml": {
+ /* omitted */
+ "attribute": {
+ "id": "sAMAccountName",
+ "username": "displayName",
+ "email": "mail"
+ }
+ }
+ }
+ }
+ ````
+ * environment variables
+ ````
+ HMD_SAML_ATTRIBUTE_ID=sAMAccountName
+ HMD_SAML_ATTRIBUTE_USERNAME=nickName
+ HMD_SAML_ATTRIBUTE_EMAIL=mail
+ ````
+
+* If you want to controll 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 HackMD. Use vertical bar to separate for environment variables.
+ * `externalGroups`: Group names array for not allowed access to HackMD. Use vertical bar to separate for environment variables.
+ * _Note: Evaluates `externalGroups` first_
+ * config.json:
+ ````javascript
+ {
+ "production": {
+ "saml": {
+ /* omitted */
+ "groupAttribute": "memberOf",
+ "requiredGroups": [ "hackmd-users", "board-members" ],
+ "externalGroups": [ "temporary-staff" ]
+ }
+ }
+ }
+ ````
+ * environment variables
+ ````
+ HMD_SAML_GROUPATTRIBUTE=memberOf
+ HMD_SAML_REQUIREDGROUPS=hackmd-users|board-members
+ HMD_SAML_EXTERNALGROUPS=temporary-staff
+ ````
+
+
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