Add authproxy preferred_username header (#3950)

Signed-off-by: Kot <kot@yukata.dev>

connector/authproxy/authproxy.go

@@ -19,11 +19,12 @@ import (
 // Headers retrieved to fetch user's email and group can be configured
 // with userHeader and groupHeader.
 type Config struct {
-	UserIDHeader string   `json:"userIDHeader"`
-	UserHeader   string   `json:"userHeader"`
-	EmailHeader  string   `json:"emailHeader"`
-	GroupHeader  string   `json:"groupHeader"`
-	Groups       []string `json:"staticGroups"`
+	UserIDHeader   string   `json:"userIDHeader"`
+	UserHeader     string   `json:"userHeader"`
+	UserNameHeader string   `json:"userNameHeader"`
+	EmailHeader    string   `json:"emailHeader"`
+	GroupHeader    string   `json:"groupHeader"`
+	Groups         []string `json:"staticGroups"`
 }
 
 // Open returns an authentication strategy which requires no user interaction.
@@ -36,6 +37,10 @@ func (c *Config) Open(id string, logger *slog.Logger) (connector.Connector, erro
 	if userHeader == "" {
 		userHeader = "X-Remote-User"
 	}
+	userNameHeader := c.UserNameHeader
+	if userNameHeader == "" {
+		userNameHeader = "X-Remote-User-Name"
+	}
 	emailHeader := c.EmailHeader
 	if emailHeader == "" {
 		emailHeader = "X-Remote-User-Email"
@@ -46,26 +51,28 @@ func (c *Config) Open(id string, logger *slog.Logger) (connector.Connector, erro
 	}
 
 	return &callback{
-		userIDHeader: userIDHeader,
-		userHeader:   userHeader,
-		emailHeader:  emailHeader,
-		groupHeader:  groupHeader,
-		groups:       c.Groups,
-		logger:       logger.With(slog.Group("connector", "type", "authproxy", "id", id)),
-		pathSuffix:   "/" + id,
+		userIDHeader:   userIDHeader,
+		userHeader:     userHeader,
+		userNameHeader: userNameHeader,
+		emailHeader:    emailHeader,
+		groupHeader:    groupHeader,
+		groups:         c.Groups,
+		logger:         logger.With(slog.Group("connector", "type", "authproxy", "id", id)),
+		pathSuffix:     "/" + id,
 	}, nil
 }
 
 // Callback is a connector which returns an identity with the HTTP header
 // X-Remote-User as verified email.
 type callback struct {
-	userIDHeader string
-	userHeader   string
-	emailHeader  string
-	groupHeader  string
-	groups       []string
-	logger       *slog.Logger
-	pathSuffix   string
+	userIDHeader   string
+	userNameHeader string
+	userHeader     string
+	emailHeader    string
+	groupHeader    string
+	groups         []string
+	logger         *slog.Logger
+	pathSuffix     string
 }
 
 // LoginURL returns the URL to redirect the user to login with.
@@ -87,6 +94,10 @@ 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)
 	}
+	remoteUserName := r.Header.Get(m.userNameHeader)
+	if remoteUserName == "" {
+		remoteUserName = remoteUser
+	}
 	remoteUserID := r.Header.Get(m.userIDHeader)
 	if remoteUserID == "" {
 		remoteUserID = remoteUser
@@ -107,7 +118,7 @@ func (m *callback) HandleCallback(s connector.Scopes, r *http.Request) (connecto
 	return connector.Identity{
 		UserID:            remoteUserID,
 		Username:          remoteUser,
-		PreferredUsername: remoteUser,
+		PreferredUsername: remoteUserName,
 		Email:             remoteUserEmail,
 		EmailVerified:     true,
 		Groups:            groups,

connector/authproxy/authproxy_test.go

@@ -11,15 +11,16 @@ import (
 )
 
 const (
-	testEmail        = "testuser@example.com"
-	testGroup1       = "group1"
-	testGroup2       = "group2"
-	testGroup3       = "group 3"
-	testGroup4       = "group 4"
-	testStaticGroup1 = "static1"
-	testStaticGroup2 = "static 2"
-	testUsername     = "testuser"
-	testUserID       = "1234567890"
+	testEmail             = "testuser@example.com"
+	testGroup1            = "group1"
+	testGroup2            = "group2"
+	testGroup3            = "group 3"
+	testGroup4            = "group 4"
+	testStaticGroup1      = "static1"
+	testStaticGroup2      = "static 2"
+	testUsername          = "Test User"
+	testPreferredUsername = "testuser"
+	testUserID            = "1234567890"
 )
 
 var logger = slog.New(slog.NewTextHandler(io.Discard, &slog.HandlerOptions{}))
@@ -49,16 +50,18 @@ func TestUser(t *testing.T) {
 
 func TestExtraHeaders(t *testing.T) {
 	config := Config{
-		UserIDHeader: "X-Remote-User-Id",
-		UserHeader:   "X-Remote-User",
-		EmailHeader:  "X-Remote-User-Email",
+		UserIDHeader:   "X-Remote-User-Id",
+		UserHeader:     "X-Remote-User",
+		UserNameHeader: "X-Remote-User-Name",
+		EmailHeader:    "X-Remote-User-Email",
 	}
 	conn := callback{
-		userHeader:   config.UserHeader,
-		userIDHeader: config.UserIDHeader,
-		emailHeader:  config.EmailHeader,
-		logger:       logger,
-		pathSuffix:   "/test",
+		userHeader:     config.UserHeader,
+		userIDHeader:   config.UserIDHeader,
+		userNameHeader: config.UserNameHeader,
+		emailHeader:    config.EmailHeader,
+		logger:         logger,
+		pathSuffix:     "/test",
 	}
 
 	req, err := http.NewRequest("GET", "/", nil)
@@ -66,6 +69,7 @@ func TestExtraHeaders(t *testing.T) {
 	req.Header = map[string][]string{
 		"X-Remote-User-Id":    {testUserID},
 		"X-Remote-User":       {testUsername},
+		"X-Remote-User-Name":  {testPreferredUsername},
 		"X-Remote-User-Email": {testEmail},
 	}
 
@@ -73,7 +77,7 @@ func TestExtraHeaders(t *testing.T) {
 	expectNil(t, err)
 
 	expectEquals(t, ident.UserID, testUserID)
-	expectEquals(t, ident.PreferredUsername, testUsername)
+	expectEquals(t, ident.PreferredUsername, testPreferredUsername)
 	expectEquals(t, ident.Username, testUsername)
 	expectEquals(t, ident.Email, testEmail)
 	expectEquals(t, len(ident.Groups), 0)