Switch to GitHub REST API to load changed files (#5618)

Co-authored-by: 6543 <6543@obermui.de>

```
// GitHub has removed commit summaries from Events API payloads from 7th October 2025 onwards.
```

- switch to rest api to load changed files
- added some small wording/var name adjustment
- added test cases using GitHub mock client

server/forge/github/github_test.go

@@ -16,14 +16,21 @@
 package github
 
 import (
+	"context"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/gin-gonic/gin"
+	"github.com/google/go-github/v75/github"
+	gh_mock "github.com/migueleliasweb/go-github-mock/src/mock"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
 
 	"go.woodpecker-ci.org/woodpecker/v3/server/forge/github/fixtures"
 	"go.woodpecker-ci.org/woodpecker/v3/server/model"
+	"go.woodpecker-ci.org/woodpecker/v3/server/store"
+	store_mocks "go.woodpecker-ci.org/woodpecker/v3/server/store/mocks"
 )
 
 func TestNew(t *testing.T) {
@@ -89,7 +96,7 @@ func Test_github(t *testing.T) {
 
 var (
 	fakeUser = &model.User{
-		Login:       "octocat",
+		Login:       "6543",
 		AccessToken: "cfcd2084",
 	}
 
@@ -110,3 +117,158 @@ var (
 		FullName: "test_name/repo_not_found",
 	}
 )
+
+func TestHook(t *testing.T) {
+	// Mock GitHub API for changed files
+	mockedHTTPClient := gh_mock.NewMockedHTTPClient(
+		gh_mock.WithRequestMatch(
+			gh_mock.GetReposCommitsByOwnerByRepoByRef,
+			github.RepositoryCommit{
+				Files: []*github.CommitFile{
+					{Filename: github.Ptr("README.md")},
+					{Filename: github.Ptr("main.go")},
+				},
+			},
+		),
+		gh_mock.WithRequestMatch(
+			gh_mock.GetReposCompareByOwnerByRepoByBasehead,
+			github.CommitsComparison{
+				Files: []*github.CommitFile{
+					{Filename: github.Ptr("main.go")},
+				},
+			},
+		),
+		gh_mock.WithRequestMatch(
+			gh_mock.GetReposPullsFilesByOwnerByRepoByPullNumber,
+			[]*github.CommitFile{
+				{Filename: github.Ptr("README.md")},
+				{Filename: github.Ptr("main.go")},
+			},
+		),
+	)
+
+	// Create a GitHub client with the mocked HTTP client
+	gh := github.NewClient(mockedHTTPClient)
+
+	// Use the custom type as the key
+	ctx := context.WithValue(context.Background(), githubClientKey, gh)
+
+	// Create a mock store using the proper mocking pattern
+	mockStore := store_mocks.NewMockStore(t)
+	mockStore.On("GetUser", mock.Anything).Return(&model.User{
+		ID:          1,
+		Login:       "6543",
+		AccessToken: "token",
+	}, nil)
+	mockStore.On("GetRepoNameFallback", mock.Anything, mock.Anything).Return(&model.Repo{
+		ID:            1,
+		ForgeRemoteID: "1",
+		Owner:         "6543",
+		Name:          "hello-world",
+		UserID:        1,
+	}, nil)
+
+	// Set up context with mock store
+	ctx = store.InjectToContext(ctx, mockStore)
+
+	// Create a mock client
+	c := &client{
+		API: defaultAPI,
+		url: defaultURL,
+	}
+
+	t.Run("convert push from webhook", func(t *testing.T) {
+		// Create a mock HTTP request with a push event payload
+		req := httptest.NewRequest("POST", "/hook", strings.NewReader(fixtures.HookPush))
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("X-GitHub-Event", "push")
+
+		// Call the Hook function
+		repo, pipeline, err := c.Hook(ctx, req)
+
+		assert.NoError(t, err)
+		assert.NotNil(t, repo)
+		assert.NotNil(t, pipeline)
+		assert.Equal(t, model.EventPush, pipeline.Event)
+		assert.Equal(t, "main", pipeline.Branch)
+		assert.Equal(t, "refs/heads/main", pipeline.Ref)
+		assert.Equal(t, "366701fde727cb7a9e7f21eb88264f59f6f9b89c", pipeline.Commit)
+		assert.Equal(t, "Fix multiline secrets replacer (#700)\n\n* Fix multiline secrets replacer\r\n\r\n* Add tests", pipeline.Message)
+		assert.Equal(t, "https://github.com/woodpecker-ci/woodpecker/commit/366701fde727cb7a9e7f21eb88264f59f6f9b89c", pipeline.ForgeURL)
+		assert.Equal(t, "6543", pipeline.Author)
+		assert.Equal(t, "https://avatars.githubusercontent.com/u/24977596?v=4", pipeline.Avatar)
+		assert.Equal(t, "admin@philipp.info", pipeline.Email)
+		assert.Equal(t, []string{"main.go"}, pipeline.ChangedFiles)
+	})
+
+	t.Run("convert pull request from webhook", func(t *testing.T) {
+		// Create a mock HTTP request with a pull request event payload
+		req := httptest.NewRequest("POST", "/hook", strings.NewReader(fixtures.HookPullRequest))
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("X-GitHub-Event", "pull_request")
+
+		// Call the Hook function
+		repo, pipeline, err := c.Hook(ctx, req)
+
+		assert.NoError(t, err)
+		assert.NotNil(t, repo)
+		assert.NotNil(t, pipeline)
+		assert.Equal(t, model.EventPull, pipeline.Event)
+		assert.Equal(t, "main", pipeline.Branch)
+		assert.Equal(t, "refs/pull/1/head", pipeline.Ref)
+		assert.Equal(t, "changes:main", pipeline.Refspec)
+		assert.Equal(t, "0d1a26e67d8f5eaf1f6ba5c57fc3c7d91ac0fd1c", pipeline.Commit)
+		assert.Equal(t, "Update the README with new information", pipeline.Message)
+		assert.Equal(t, "Update the README with new information", pipeline.Title)
+		assert.Equal(t, "baxterthehacker", pipeline.Author)
+		assert.Equal(t, "https://avatars.githubusercontent.com/u/6752317?v=3", pipeline.Avatar)
+		assert.Equal(t, "octocat", pipeline.Sender)
+		assert.Equal(t, []string{"README.md", "main.go"}, pipeline.ChangedFiles)
+	})
+
+	t.Run("convert deployment from webhook", func(t *testing.T) {
+		// Create a mock HTTP request with a deployment event payload
+		req := httptest.NewRequest("POST", "/hook", strings.NewReader(fixtures.HookDeploy))
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("X-GitHub-Event", "deployment")
+
+		// Call the Hook function
+		repo, pipeline, err := c.Hook(ctx, req)
+
+		assert.NoError(t, err)
+		assert.NotNil(t, repo)
+		assert.NotNil(t, pipeline)
+		assert.Equal(t, model.EventDeploy, pipeline.Event)
+		assert.Equal(t, "main", pipeline.Branch)
+		assert.Equal(t, "refs/heads/main", pipeline.Ref)
+		assert.Equal(t, "9049f1265b7d61be4a8904a9a27120d2064dab3b", pipeline.Commit)
+		assert.Equal(t, "", pipeline.Message)
+		assert.Equal(t, "https://api.github.com/repos/baxterthehacker/public-repo/deployments/710692", pipeline.ForgeURL)
+		assert.Equal(t, "baxterthehacker", pipeline.Author)
+		assert.Equal(t, "https://avatars.githubusercontent.com/u/6752317?v=3", pipeline.Avatar)
+	})
+
+	t.Run("convert tag from webhook", func(t *testing.T) {
+		// Create a mock HTTP request with a tag event payload but push event header (tags create push events at github)
+		req := httptest.NewRequest("POST", "/hook", strings.NewReader(fixtures.HookTag))
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("X-GitHub-Event", "push")
+
+		// Call the Hook function
+		repo, pipeline, err := c.Hook(ctx, req)
+
+		assert.NoError(t, err)
+		assert.NotNil(t, repo)
+		assert.NotNil(t, pipeline)
+		assert.Equal(t, model.EventTag, pipeline.Event)
+		assert.Equal(t, "main", pipeline.Branch)
+		assert.Equal(t, "refs/tags/the-tag-v1", pipeline.Ref)
+		assert.Equal(t, "67012991d6c69b1c58378346fca366b864d8d1a1", pipeline.Commit)
+		assert.Equal(t, "Update .woodpecker.yml", pipeline.Message)
+		assert.Equal(t, "https://github.com/6543/test_ci_tmp/commit/67012991d6c69b1c58378346fca366b864d8d1a1", pipeline.ForgeURL)
+		assert.Equal(t, "6543", pipeline.Author)
+		assert.Equal(t, "https://avatars.githubusercontent.com/u/24977596?v=4", pipeline.Avatar)
+		assert.Equal(t, "6543@obermui.de", pipeline.Email)
+		assert.Empty(t, pipeline.ChangedFiles)
+	})
+}