Support custom username field.

packages/xo-server-auth-saml/README.md

@@ -38,6 +38,11 @@ plugins:
 
       # Issuer string to supply the identity provider.
       issuer: 'xen-orchestra'
+
+      # Field to use as the name of the user.
+      #
+      # Default: uid.
+      usernameField: 'uid'
 ```
 
 ## Development

packages/xo-server-auth-saml/src/index.js

@@ -2,15 +2,35 @@ import {Strategy} from 'passport-saml'
 
 // ===================================================================
 
+function extract (obj, prop, defaultValue = undefined) {
+  if (prop in obj) {
+    const value = obj[prop]
+    delete obj[prop]
+
+    return value
+  }
+
+  return defaultValue
+}
+
+// ===================================================================
+
 class AuthSamlXoPlugin {
   constructor (conf) {
+    this._usernameField = extract(conf, 'usernameField', 'uid')
     this._conf = conf
   }
 
   load (xo) {
     xo.registerPassportStrategy(new Strategy(this._conf, async (profile, done) => {
+      const name = profile[this._usernameField]
+      if (!name) {
+        done('no name found for this user')
+        return
+      }
+
       try {
-        done(null, await xo.registerUser('saml', profile.uid))
+        done(null, await xo.registerUser('saml', name))
       } catch (error) {
         done(error.message)
       }