refactor: move domain check into small helper util (#1000)

internal/controller/oauth_controller.go

@@ -1,9 +1,9 @@
 package controller
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
-	"net/url"
 	"strings"
 	"time"
 
@@ -12,6 +12,7 @@ import (
 	"github.com/tinyauthapp/tinyauth/internal/service"
 	"github.com/tinyauthapp/tinyauth/internal/utils"
 	"github.com/tinyauthapp/tinyauth/internal/utils/logger"
+	"github.com/tinyauthapp/tinyauth/pkg/validators"
 	"go.uber.org/dig"
 
 	"github.com/gin-gonic/gin"
@@ -311,54 +312,46 @@ func (controller *OAuthController) getCookieDomain() string {
 }
 
 func (controller *OAuthController) isRedirectSafe(redirectURI string) bool {
-	u, err := url.Parse(redirectURI)
+	v := validators.NewDomainValidator(validators.DomainValidatorOptions{
+		WithScheme: true,
+		WithPort:   true,
+	})
+
+	_, err := v.SafeHostname(controller.runtime.AppURL)
 
 	if err != nil {
-		controller.log.App.Error().Err(err).Msg("Failed to parse redirect URI")
+		controller.log.App.Error().Err(err).Msg("App URL is invalid, cannot validate redirect URI")
 		return false
 	}
 
-	if u.Scheme == "" || u.Host == "" {
-		controller.log.App.Warn().Msg("Redirect URI has invalid scheme or host")
-		return false
-	}
+	err = v.Validate(redirectURI, controller.runtime.AppURL)
 
-	au, err := url.Parse(controller.runtime.AppURL)
-
-	if err != nil {
-		controller.log.App.Error().Err(err).Msg("Failed to parse app URL")
-		return false
-	}
-
-	if u.Scheme != au.Scheme {
-		controller.log.App.Warn().Msg("Redirect URI scheme does not match app URL scheme")
-		return false
-	}
-
-	getEffectivePort := func(u *url.URL) string {
-		if u.Port() != "" {
-			return u.Port()
-		}
-		if u.Scheme == "https" {
-			return "443"
-		}
-		return "80"
-	}
-
-	if getEffectivePort(u) != getEffectivePort(au) {
-		controller.log.App.Warn().Msg("Redirect URI port does not match app URL port")
-		return false
-	}
-
-	if strings.EqualFold(u.Hostname(), au.Hostname()) {
+	if err == nil {
 		return true
 	}
 
+	controller.log.App.Debug().Err(err).Msg("Failed to validate redirect URI")
+
+	if errors.Is(err, validators.ErrInvalidURL) ||
+		errors.Is(err, validators.ErrSchemeMismatch) ||
+		errors.Is(err, validators.ErrPortMismatch) {
+		return false
+	}
+
 	if !controller.config.Auth.SubdomainsEnabled {
 		return false
 	}
 
-	if strings.HasSuffix(strings.ToLower(u.Hostname()), "."+strings.ToLower(controller.runtime.CookieDomain)) {
+	v = validators.NewDomainValidator(validators.DomainValidatorOptions{})
+
+	hostname, err := v.SafeHostname(redirectURI)
+
+	if err != nil {
+		controller.log.App.Error().Err(err).Msg("Failed to get safe hostname from redirect URI")
+		return false
+	}
+
+	if strings.HasSuffix(hostname, "."+strings.ToLower(controller.runtime.CookieDomain)) {
 		return true
 	}
 

internal/controller/oauth_controller_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/tinyauthapp/tinyauth/internal/utils/logger"
 )
 
-func TestOAuthControllerIsRedirectSafe(t *testing.T) {
+func TestOAuthController_isRedirectSafe(t *testing.T) {
 	log := logger.NewLogger().WithTestConfig()
 	log.Init()
 

internal/service/access_controls_service.go

@@ -1,10 +1,12 @@
 package service
 
 import (
+	"errors"
 	"strings"
 
 	"github.com/tinyauthapp/tinyauth/internal/model"
 	"github.com/tinyauthapp/tinyauth/internal/utils/logger"
+	"github.com/tinyauthapp/tinyauth/pkg/validators"
 	"go.uber.org/dig"
 )
 
@@ -38,13 +40,19 @@ func NewAccessControlsService(i AccessControlServiceInput) *AccessControlsServic
 func (service *AccessControlsService) lookupStaticACLs(domain string) *model.App {
 	var nameMatch *model.App
 
+	v := validators.NewDomainValidator(validators.DomainValidatorOptions{})
+
 	// First try to find a matching app by domain, then fallback to matching by app name (subdomain)
 	for app, config := range service.config.Apps {
-		if config.Config.Domain == domain {
+		err := v.Validate(config.Config.Domain, domain)
+		if err == nil {
 			service.log.App.Debug().Str("name", app).Msg("Found matching container by domain")
 			return &config
 		}
-		if strings.SplitN(domain, ".", 2)[0] == app {
+		if !errors.Is(err, validators.ErrHostnameMismatch) {
+			service.log.App.Debug().Str("name", app).Err(err).Msg("Domain validation failed")
+		}
+		if strings.HasPrefix(strings.ToLower(domain), strings.ToLower(app+".")) {
 			service.log.App.Debug().Str("name", app).Msg("Found matching container by app name")
 			nameMatch = &config
 		}