refactor(auth): move oauth handler code to its own file

api/http/handler/auth/authenticate.go

@@ -93,60 +93,6 @@ func (handler *Handler) authenticateLDAP(w http.ResponseWriter, user *portainer.
 	return handler.writeToken(w, user)
 }
 
-func (handler *Handler) authenticateOAuth(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
-	var payload oauthPayload
-	err := request.DecodeAndValidateJSONPayload(r, &payload)
-	if err != nil {
-		return &httperror.HandlerError{http.StatusBadRequest, "Invalid request payload", err}
-	}
-
-	settings, err := handler.SettingsService.Settings()
-	if err != nil {
-		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve settings from the database", err}
-	}
-
-	if settings.AuthenticationMethod != 3 {
-		return &httperror.HandlerError{http.StatusForbidden, "OAuth authentication is not being used", err}
-	}
-
-	token, err := handler.OAuthService.GetAccessToken(payload.Code, &settings.OAuthSettings)
-	if err != nil {
-		log.Printf("[DEBUG] - Failed retrieving access token: %v", err)
-		return &httperror.HandlerError{http.StatusUnprocessableEntity, "Invalid access token", portainer.ErrUnauthorized}
-	}
-
-	username, err := handler.OAuthService.GetUsername(token, &settings.OAuthSettings)
-	if err != nil {
-		log.Printf("[DEBUG] - Failed acquiring username: %v", err)
-		return &httperror.HandlerError{http.StatusForbidden, "Unable to acquire username", portainer.ErrUnauthorized}
-	}
-
-	u, err := handler.UserService.UserByUsername(username)
-	if err != nil && err != portainer.ErrObjectNotFound {
-		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve a user with the specified username from the database", err}
-	}
-
-	if u == nil && !settings.OAuthSettings.OAuthAutoCreateUsers {
-		return &httperror.HandlerError{http.StatusForbidden, "Unregistered account", portainer.ErrUnauthorized}
-	}
-
-	if u == nil {
-		user := &portainer.User{
-			Username: username,
-			Role:     portainer.StandardUserRole,
-		}
-
-		err = handler.UserService.CreateUser(user)
-		if err != nil {
-			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to persist user inside the database", err}
-		}
-
-		return handler.writeToken(w, user)
-	}
-
-	return handler.writeToken(w, u)
-}
-
 func (handler *Handler) authenticateInternal(w http.ResponseWriter, user *portainer.User, password string) *httperror.HandlerError {
 	err := handler.CryptoService.CompareHashAndData(user.Password, password)
 	if err != nil {

api/http/handler/auth/authenticate_oauth.go

@@ -0,0 +1,64 @@
+package auth
+
+import (
+	"log"
+	"net/http"
+
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/request"
+	"github.com/portainer/portainer"
+)
+
+func (handler *Handler) authenticateOAuth(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	var payload oauthPayload
+	err := request.DecodeAndValidateJSONPayload(r, &payload)
+	if err != nil {
+		return &httperror.HandlerError{http.StatusBadRequest, "Invalid request payload", err}
+	}
+
+	settings, err := handler.SettingsService.Settings()
+	if err != nil {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve settings from the database", err}
+	}
+
+	if settings.AuthenticationMethod != 3 {
+		return &httperror.HandlerError{http.StatusForbidden, "OAuth authentication is not being used", err}
+	}
+
+	token, err := handler.OAuthService.GetAccessToken(payload.Code, &settings.OAuthSettings)
+	if err != nil {
+		log.Printf("[DEBUG] - Failed retrieving access token: %v", err)
+		return &httperror.HandlerError{http.StatusUnprocessableEntity, "Invalid access token", portainer.ErrUnauthorized}
+	}
+
+	username, err := handler.OAuthService.GetUsername(token, &settings.OAuthSettings)
+	if err != nil {
+		log.Printf("[DEBUG] - Failed acquiring username: %v", err)
+		return &httperror.HandlerError{http.StatusForbidden, "Unable to acquire username", portainer.ErrUnauthorized}
+	}
+
+	u, err := handler.UserService.UserByUsername(username)
+	if err != nil && err != portainer.ErrObjectNotFound {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve a user with the specified username from the database", err}
+	}
+
+	if u == nil && !settings.OAuthSettings.OAuthAutoCreateUsers {
+		return &httperror.HandlerError{http.StatusForbidden, "Unregistered account", portainer.ErrUnauthorized}
+	}
+
+	if u == nil {
+		user := &portainer.User{
+			Username: username,
+			Role:     portainer.StandardUserRole,
+		}
+
+		err = handler.UserService.CreateUser(user)
+		if err != nil {
+			return &httperror.HandlerError{http.StatusInternalServerError, "Unable to persist user inside the database", err}
+		}
+
+		return handler.writeToken(w, user)
+	}
+
+	return handler.writeToken(w, u)
+}