Fix url validation in webhook add/edit API (#34492) (#34496)

Backport #34492 by @lunny

Fix #34491

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/api/v1/utils/hook.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/modules/validation"
 	webhook_module "code.gitea.io/gitea/modules/webhook"
 	"code.gitea.io/gitea/services/context"
 	webhook_service "code.gitea.io/gitea/services/webhook"
@@ -92,6 +93,10 @@ func checkCreateHookOption(ctx *context.APIContext, form *api.CreateHookOption)
 		ctx.APIError(http.StatusUnprocessableEntity, "Invalid content type")
 		return false
 	}
+	if !validation.IsValidURL(form.Config["url"]) {
+		ctx.APIError(http.StatusUnprocessableEntity, "Invalid url")
+		return false
+	}
 	return true
 }
 
@@ -324,6 +329,10 @@ func EditRepoHook(ctx *context.APIContext, form *api.EditHookOption, hookID int6
 func editHook(ctx *context.APIContext, form *api.EditHookOption, w *webhook.Webhook) bool {
 	if form.Config != nil {
 		if url, ok := form.Config["url"]; ok {
+			if !validation.IsValidURL(url) {
+				ctx.APIError(http.StatusUnprocessableEntity, "Invalid url")
+				return false
+			}
 			w.URL = url
 		}
 		if ct, ok := form.Config["content_type"]; ok {

routers/api/v1/utils/hook_test.go

@@ -0,0 +1,82 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package utils
+
+import (
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/services/contexttest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTestHookValidation(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+
+	t.Run("Test Validation", func(t *testing.T) {
+		ctx, _ := contexttest.MockAPIContext(t, "user2/repo1/hooks")
+		contexttest.LoadRepo(t, ctx, 1)
+		contexttest.LoadRepoCommit(t, ctx)
+		contexttest.LoadUser(t, ctx, 2)
+
+		checkCreateHookOption(ctx, &structs.CreateHookOption{
+			Type: "gitea",
+			Config: map[string]string{
+				"content_type": "json",
+				"url":          "https://example.com/webhook",
+			},
+		})
+		assert.Equal(t, 0, ctx.Resp.WrittenStatus()) // not written yet
+	})
+
+	t.Run("Test Validation with invalid URL", func(t *testing.T) {
+		ctx, _ := contexttest.MockAPIContext(t, "user2/repo1/hooks")
+		contexttest.LoadRepo(t, ctx, 1)
+		contexttest.LoadRepoCommit(t, ctx)
+		contexttest.LoadUser(t, ctx, 2)
+
+		checkCreateHookOption(ctx, &structs.CreateHookOption{
+			Type: "gitea",
+			Config: map[string]string{
+				"content_type": "json",
+				"url":          "example.com/webhook",
+			},
+		})
+		assert.Equal(t, http.StatusUnprocessableEntity, ctx.Resp.WrittenStatus())
+	})
+
+	t.Run("Test Validation with invalid webhook type", func(t *testing.T) {
+		ctx, _ := contexttest.MockAPIContext(t, "user2/repo1/hooks")
+		contexttest.LoadRepo(t, ctx, 1)
+		contexttest.LoadRepoCommit(t, ctx)
+		contexttest.LoadUser(t, ctx, 2)
+
+		checkCreateHookOption(ctx, &structs.CreateHookOption{
+			Type: "unknown",
+			Config: map[string]string{
+				"content_type": "json",
+				"url":          "example.com/webhook",
+			},
+		})
+		assert.Equal(t, http.StatusUnprocessableEntity, ctx.Resp.WrittenStatus())
+	})
+
+	t.Run("Test Validation with empty content type", func(t *testing.T) {
+		ctx, _ := contexttest.MockAPIContext(t, "user2/repo1/hooks")
+		contexttest.LoadRepo(t, ctx, 1)
+		contexttest.LoadRepoCommit(t, ctx)
+		contexttest.LoadUser(t, ctx, 2)
+
+		checkCreateHookOption(ctx, &structs.CreateHookOption{
+			Type: "unknown",
+			Config: map[string]string{
+				"url": "https://example.com/webhook",
+			},
+		})
+		assert.Equal(t, http.StatusUnprocessableEntity, ctx.Resp.WrittenStatus())
+	})
+}

routers/api/v1/utils/main_test.go

@@ -0,0 +1,21 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package utils
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
+	webhook_service "code.gitea.io/gitea/services/webhook"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m, &unittest.TestOptions{
+		SetUp: func() error {
+			setting.LoadQueueSettings()
+			return webhook_service.Init()
+		},
+	})
+}