Add support for extra claims to authproxy connector

connector/authproxy/authproxy.go

@@ -19,33 +19,53 @@ import (
 // Headers retrieved to fetch user's email and group can be configured
 // with userHeader and groupHeader.
 type Config struct {
-	UserHeader  string   `json:"userHeader"`
-	GroupHeader string   `json:"groupHeader"`
-	Groups      []string `json:"staticGroups"`
+	UserIDHeader string   `json:"userIDHeader"`
+	UserHeader   string   `json:"userHeader"`
+	EmailHeader  string   `json:"emailHeader"`
+	GroupHeader  string   `json:"groupHeader"`
+	Groups       []string `json:"staticGroups"`
 }
 
 // Open returns an authentication strategy which requires no user interaction.
 func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
+	userIDHeader := c.UserIDHeader
+	if userIDHeader == "" {
+		userIDHeader = "X-Remote-User-Id"
+	}
 	userHeader := c.UserHeader
 	if userHeader == "" {
 		userHeader = "X-Remote-User"
 	}
+	emailHeader := c.EmailHeader
+	if emailHeader == "" {
+		emailHeader = "X-Remote-User-Email"
+	}
 	groupHeader := c.GroupHeader
 	if groupHeader == "" {
 		groupHeader = "X-Remote-Group"
 	}
 
-	return &callback{userHeader: userHeader, groupHeader: groupHeader, logger: logger, pathSuffix: "/" + id, groups: c.Groups}, nil
+	return &callback{
+		userIDHeader: userIDHeader,
+		userHeader:   userHeader,
+		emailHeader:  emailHeader,
+		groupHeader:  groupHeader,
+		groups:       c.Groups,
+		logger:       logger,
+		pathSuffix:   "/" + id,
+	}, nil
 }
 
 // Callback is a connector which returns an identity with the HTTP header
 // X-Remote-User as verified email.
 type callback struct {
-	userHeader  string
-	groupHeader string
-	groups      []string
-	logger      log.Logger
-	pathSuffix  string
+	userIDHeader string
+	userHeader   string
+	emailHeader  string
+	groupHeader  string
+	groups       []string
+	logger       log.Logger
+	pathSuffix   string
 }
 
 // LoginURL returns the URL to redirect the user to login with.
@@ -67,6 +87,14 @@ func (m *callback) HandleCallback(s connector.Scopes, r *http.Request) (connecto
 	if remoteUser == "" {
 		return connector.Identity{}, fmt.Errorf("required HTTP header %s is not set", m.userHeader)
 	}
+	remoteUserID := r.Header.Get(m.userIDHeader)
+	if remoteUserID == "" {
+		remoteUserID = remoteUser
+	}
+	remoteUserEmail := r.Header.Get(m.emailHeader)
+	if remoteUserEmail == "" {
+		remoteUserEmail = remoteUser
+	}
 	groups := m.groups
 	headerGroup := r.Header.Get(m.groupHeader)
 	if headerGroup != "" {
@@ -77,9 +105,10 @@ func (m *callback) HandleCallback(s connector.Scopes, r *http.Request) (connecto
 		groups = append(splitheaderGroup, groups...)
 	}
 	return connector.Identity{
-		UserID:        remoteUser, // TODO: figure out if this is a bad ID value.
-		Email:         remoteUser,
-		EmailVerified: true,
-		Groups:        groups,
+		UserID:            remoteUserID,
+		PreferredUsername: remoteUser,
+		Email:             remoteUserEmail,
+		EmailVerified:     true,
+		Groups:            groups,
 	}, nil
 }

connector/authproxy/authproxy_test.go

@@ -19,6 +19,8 @@ const (
 	testGroup4       = "group 4"
 	testStaticGroup1 = "static1"
 	testStaticGroup2 = "static 2"
+	testUsername     = "testuser"
+	testUserID       = "1234567890"
 )
 
 var logger = &logrus.Logger{Out: io.Discard, Formatter: &logrus.TextFormatter{}}
@@ -32,13 +34,46 @@ func TestUser(t *testing.T) {
 	req, err := http.NewRequest("GET", "/", nil)
 	expectNil(t, err)
 	req.Header = map[string][]string{
-		"X-Remote-User": {testEmail},
+		"X-Remote-User": {testUsername},
 	}
 
 	ident, err := conn.HandleCallback(connector.Scopes{OfflineAccess: true, Groups: true}, req)
 	expectNil(t, err)
 
-	expectEquals(t, ident.UserID, testEmail)
+	// If not specified, the userID and email should fall back to the remote user
+	expectEquals(t, ident.UserID, testUsername)
+	expectEquals(t, ident.PreferredUsername, testUsername)
+	expectEquals(t, ident.Email, testUsername)
+	expectEquals(t, len(ident.Groups), 0)
+}
+
+func TestExtraHeaders(t *testing.T) {
+	config := Config{
+		UserIDHeader: "X-Remote-User-Id",
+		UserHeader:   "X-Remote-User",
+		EmailHeader:  "X-Remote-User-Email",
+	}
+	conn := callback{
+		userHeader:   config.UserHeader,
+		userIDHeader: config.UserIDHeader,
+		emailHeader:  config.EmailHeader,
+		logger:       logger,
+		pathSuffix:   "/test",
+	}
+
+	req, err := http.NewRequest("GET", "/", nil)
+	expectNil(t, err)
+	req.Header = map[string][]string{
+		"X-Remote-User-Id":    {testUserID},
+		"X-Remote-User":       {testUsername},
+		"X-Remote-User-Email": {testEmail},
+	}
+
+	ident, err := conn.HandleCallback(connector.Scopes{OfflineAccess: true, Groups: true}, req)
+	expectNil(t, err)
+
+	expectEquals(t, ident.UserID, testUserID)
+	expectEquals(t, ident.PreferredUsername, testUsername)
 	expectEquals(t, ident.Email, testEmail)
 	expectEquals(t, len(ident.Groups), 0)
 }