[GITEA] Allow user to select email for file operations in Web UI

- Add a dropdown to the web interface for changing files to select which
Email should be used for the commit. It only shows (and verifies) that a
activated mail can be used, while this isn't necessary, it's better to
have this already in place.
- Added integration testing.
- Resolves https://codeberg.org/forgejo/forgejo/issues/281

(cherry picked from commit 564e701f407c0e110f3c7a4102bf7ed7902b815f)
(cherry picked from commit de8f2e03cc7d274049dd6a849b3d226968782644)
(cherry picked from commit 0182cff12ed4b68bd49ebc2b9951d9a29f7a36ca)
(cherry picked from commit 9c74254d4606febd702315c670db4fb6b14040a1)
(cherry picked from commit 2f0b68f821ae53dd12b496cc660353d5bf7cd143)
(cherry picked from commit 079b995d49ba7a625035fe9ec53741f6b0112007)
(cherry picked from commit 6952ea6ee3de8157d056c4381de7529de6eaef7b)
(cherry picked from commit 6c7d5a5d140152be80ec38a979a2a7b704ce653a)
(cherry picked from commit 49c39f0ed5a011b26f2e33f35811bb31fab3cf64)
(cherry picked from commit a8f9727388192c6c22b2f8cbbae15a96203ec3b6)

models/user/email_address.go

···
 	return emails, nil
 }
 
+type ActivatedEmailAddress struct {
+	ID    int64
+	Email string
+}
+
+func GetActivatedEmailAddresses(ctx context.Context, uid int64) ([]*ActivatedEmailAddress, error) {
+	emails := make([]*ActivatedEmailAddress, 0, 8)
+	if err := db.GetEngine(ctx).
+		Table("email_address").
+		Select("id, email").
+		Where("uid=?", uid).
+		And("is_activated=?", true).
+		Asc("id").
+		Find(&emails); err != nil {
+		return nil, err
+	}
+	return emails, nil
+}
+
 // GetEmailAddressByID gets a user's email address by ID
 func GetEmailAddressByID(ctx context.Context, uid, id int64) (*EmailAddress, error) {
 	// User ID is required for security reasons

models/user/email_address_test.go

···
 package user_test
 
 import (
+	"fmt"
 	"testing"
 
 	"code.gitea.io/gitea/models/db"
···
 		})
 	}
 }
+
+func TestGetActivatedEmailAddresses(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	testCases := []struct {
+		UID      int64
+		expected []*user_model.ActivatedEmailAddress
+	}{
+		{
+			UID:      1,
+			expected: []*user_model.ActivatedEmailAddress{{ID: 9, Email: "[e-mail]"}, {ID: 33, Email: "[e-mail]"}, {ID: 34, Email: "[e-mail]"}},
+		},
+		{
+			UID:      2,
+			expected: []*user_model.ActivatedEmailAddress{{ID: 3, Email: "[e-mail]"}},
+		},
+		{
+			UID:      4,
+			expected: []*user_model.ActivatedEmailAddress{{ID: 11, Email: "[e-mail]"}},
+		},
+		{
+			UID:      11,
+			expected: []*user_model.ActivatedEmailAddress{},
+		},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(fmt.Sprintf("User %d", testCase.UID), func(t *testing.T) {
+			emails, err := user_model.GetActivatedEmailAddresses(db.DefaultContext, testCase.UID)
+			assert.NoError(t, err)
+			assert.Equal(t, testCase.expected, emails)
+		})
+	}
+}

routers/web/repo/editor.go

···
 	git_model "code.gitea.io/gitea/models/git"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/charset"
 	"code.gitea.io/gitea/modules/context"
···
 	return treeNames, treePaths
 }
 
+// getSelectableEmailAddresses returns which emails can be used by the user as
+// email for a Git commiter.
+func getSelectableEmailAddresses(ctx *context.Context) ([]*user_model.ActivatedEmailAddress, error) {
+	// Retrieve emails that the user could use for commiter identity.
+	commitEmails, err := user_model.GetActivatedEmailAddresses(ctx, ctx.Doer.ID)
+	if err != nil {
+		return nil, fmt.Errorf("GetActivatedEmailAddresses: %w", err)
+	}
+
+	// Allow for the placeholder mail to be used. Use -1 as ID to identify
+	// this entry to be the placerholder mail of the user.
+	placeholderMail := &user_model.ActivatedEmailAddress{ID: -1, Email: ctx.Doer.GetPlaceholderEmail()}
+	if ctx.Doer.KeepEmailPrivate {
+		commitEmails = append([]*user_model.ActivatedEmailAddress{placeholderMail}, commitEmails...)
+	} else {
+		commitEmails = append(commitEmails, placeholderMail)
+	}
+
+	return commitEmails, nil
+}
+
 func editFile(ctx *context.Context, isNewFile bool) {
 	ctx.Data["PageIsEdit"] = true
 	ctx.Data["IsNewFile"] = isNewFile
···
 		treeNames = append(treeNames, fileName)
 	}
 
+	commitEmails, err := getSelectableEmailAddresses(ctx)
+	if err != nil {
+		ctx.ServerError("getSelectableEmailAddresses", err)
+		return
+	}
+
 	ctx.Data["TreeNames"] = treeNames
 	ctx.Data["TreePaths"] = treePaths
 	ctx.Data["BranchLink"] = ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchNameSubURL()
···
 	ctx.Data["PreviewableExtensions"] = strings.Join(markup.PreviewableExtensions(), ",")
 	ctx.Data["LineWrapExtensions"] = strings.Join(setting.Repository.Editor.LineWrapExtensions, ",")
 	ctx.Data["EditorconfigJson"] = GetEditorConfig(ctx, treePath)
+	ctx.Data["CommitMails"] = commitEmails
+	ctx.Data["DefaultCommitMail"] = ctx.Doer.GetEmail()
 
 	ctx.HTML(http.StatusOK, tplEditFile)
 }
···
 		branchName = form.NewBranchName
 	}
 
+	commitEmails, err := getSelectableEmailAddresses(ctx)
+	if err != nil {
+		ctx.ServerError("getSelectableEmailAddresses", err)
+		return
+	}
+
 	ctx.Data["PageIsEdit"] = true
 	ctx.Data["PageHasPosted"] = true
 	ctx.Data["IsNewFile"] = isNewFile
···
 	ctx.Data["PreviewableExtensions"] = strings.Join(markup.PreviewableExtensions(), ",")
 	ctx.Data["LineWrapExtensions"] = strings.Join(setting.Repository.Editor.LineWrapExtensions, ",")
 	ctx.Data["EditorconfigJson"] = GetEditorConfig(ctx, form.TreePath)
+	ctx.Data["CommitMails"] = commitEmails
+	ctx.Data["DefaultCommitMail"] = ctx.Doer.GetEmail()
 
 	if ctx.HasError() {
 		ctx.HTML(http.StatusOK, tplEditFile)
···
 		operation = "create"
 	}
 
+	gitIdentity := &files_service.IdentityOptions{
+		Name: ctx.Doer.Name,
+	}
+
+	// -1 is defined as placeholder email.
+	if form.CommitMailID == -1 {
+		gitIdentity.Email = ctx.Doer.GetPlaceholderEmail()
+	} else {
+		// Check if the given email is activated.
+		email, err := user_model.GetEmailAddressByID(ctx, ctx.Doer.ID, form.CommitMailID)
+		if err != nil {
+			ctx.ServerError("GetEmailAddressByID", err)
+			return
+		}
+
+		if email == nil || !email.IsActivated {
+			ctx.Data["Err_CommitMailID"] = true
+			ctx.RenderWithErr(ctx.Tr("repo.editor.invalid_commit_mail"), tplEditFile, &form)
+			return
+		}
+
+		gitIdentity.Email = email.Email
+	}
+
 	if _, err := files_service.ChangeRepoFiles(ctx, ctx.Repo.Repository, ctx.Doer, &files_service.ChangeRepoFilesOptions{
 		LastCommitID: form.LastCommit,
 		OldBranch:    ctx.Repo.BranchName,
···
 				ContentReader: strings.NewReader(strings.ReplaceAll(form.Content, "\r", "")),
 			},
 		},
-		Signoff: form.Signoff,
+		Signoff:   form.Signoff,
+		Author:    gitIdentity,
+		Committer: gitIdentity,
 	}); err != nil {
 		// This is where we handle all the errors thrown by files_service.ChangeRepoFiles
 		if git.IsErrNotExist(err) {

services/forms/repo_form.go

···
 	CommitChoice  string `binding:"Required;MaxSize(50)"`
 	NewBranchName string `binding:"GitRefName;MaxSize(100)"`
 	LastCommit    string
+	CommitMailID  int64 `binding:"Required"`
 	Signoff       bool
 }
 

services/repository/files/file.go

···
 			if committer.Name != "" {
 				committerUser.FullName = committer.Name
 			}
+			// Use the provided email and not revert to placeholder mail.
+			committerUser.KeepEmailPrivate = false
 		} else {
 			committerUser = &user_model.User{
 				FullName: committer.Name,
···
 			if authorUser.Name != "" {
 				authorUser.FullName = author.Name
 			}
+			// Use the provided email and not revert to placeholder mail.
+			authorUser.KeepEmailPrivate = false
 		} else {
 			authorUser = &user_model.User{
 				FullName: author.Name,

templates/repo/editor/commit_form.tmpl

···
 			</div>
 			{{end}}
 		</div>
+		<div class="field {{if .Err_CommitMailID}}error{{end}}">
+			<label for="commit_mail_id">Commit email</label>
+			<select class="ui selection dropdown" name="commit_mail_id">
+			{{range .CommitMails}}
+				<option{{if eq $.DefaultCommitMail .Email}} selected="selected"{{end}} value="{{.ID}}">{{.Email}}</option>
+			{{end}}
+			</select>
+		</div>
 	</div>
 	<button id="commit-button" type="submit" class="ui primary button">
 		{{if eq .commit_choice "commit-to-new-branch"}}{{ctx.Locale.Tr "repo.editor.propose_file_change"}}{{else}}{{ctx.Locale.Tr "repo.editor.commit_changes"}}{{end}}

tests/integration/api_repo_languages_test.go

···
 
 		// Save new file to master branch
 		req = NewRequestWithValues(t, "POST", "/user2/repo1/_new/master/", map[string]string{
-			"_csrf":         doc.GetCSRF(),
-			"last_commit":   lastCommit,
-			"tree_path":     "test.go",
-			"content":       "package main",
-			"commit_choice": "direct",
+			"_csrf":          doc.GetCSRF(),
+			"last_commit":    lastCommit,
+			"tree_path":      "test.go",
+			"content":        "package main",
+			"commit_choice":  "direct",
+			"commit_mail_id": "3",
 		})
 		session.MakeRequest(t, req, http.StatusSeeOther)
 

tests/integration/editor_test.go

···
 package integration
 
 import (
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"path"
 	"testing"
 
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
 	gitea_context "code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/translation"
+	"code.gitea.io/gitea/tests"
 
 	"github.com/stretchr/testify/assert"
 )
···
 
 		// Save new file to master branch
 		req = NewRequestWithValues(t, "POST", "/user2/repo1/_new/master/", map[string]string{
-			"_csrf":         doc.GetCSRF(),
-			"last_commit":   lastCommit,
-			"tree_path":     "test.txt",
-			"content":       "Content",
-			"commit_choice": "direct",
+			"_csrf":          doc.GetCSRF(),
+			"last_commit":    lastCommit,
+			"tree_path":      "test.txt",
+			"content":        "Content",
+			"commit_choice":  "direct",
+			"commit_mail_id": "3",
 		})
 		session.MakeRequest(t, req, http.StatusSeeOther)
 	})
···
 
 		// Save new file to master branch
 		req = NewRequestWithValues(t, "POST", "/user2/repo1/_new/master/", map[string]string{
-			"_csrf":         doc.GetCSRF(),
-			"last_commit":   lastCommit,
-			"tree_path":     "test.txt",
-			"content":       "Content",
-			"commit_choice": "direct",
+			"_csrf":          doc.GetCSRF(),
+			"last_commit":    lastCommit,
+			"tree_path":      "test.txt",
+			"content":        "Content",
+			"commit_choice":  "direct",
+			"commit_mail_id": "3",
 		})
 
 		resp = session.MakeRequest(t, req, http.StatusOK)
···
 	// Submit the edits
 	req = NewRequestWithValues(t, "POST", path.Join(user, repo, "_edit", branch, filePath),
 		map[string]string{
-			"_csrf":         htmlDoc.GetCSRF(),
-			"last_commit":   lastCommit,
-			"tree_path":     filePath,
-			"content":       newContent,
-			"commit_choice": "direct",
+			"_csrf":          htmlDoc.GetCSRF(),
+			"last_commit":    lastCommit,
+			"tree_path":      filePath,
+			"content":        newContent,
+			"commit_choice":  "direct",
+			"commit_mail_id": "-1",
 		},
 	)
 	session.MakeRequest(t, req, http.StatusSeeOther)
···
 			"content":         newContent,
 			"commit_choice":   "commit-to-new-branch",
 			"new_branch_name": targetBranch,
+			"commit_mail_id":  "-1",
 		},
 	)
 	session.MakeRequest(t, req, http.StatusSeeOther)
···
 		testEditFileToNewBranch(t, session, "user2", "repo1", "master", "feature/test", "README.md", "Hello, World (Edited)\n")
 	})
 }
+
+func TestEditFileCommitMail(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, _ *url.URL) {
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+		session := loginUser(t, user.Name)
+		link := path.Join("user2", "repo1", "_edit", "master", "README.md")
+
+		lastCommitAndCSRF := func() (string, string) {
+			req := NewRequest(t, "GET", link)
+			resp := session.MakeRequest(t, req, http.StatusOK)
+
+			htmlDoc := NewHTMLParser(t, resp.Body)
+			lastCommit := htmlDoc.GetInputValueByName("last_commit")
+			assert.NotEmpty(t, lastCommit)
+
+			return lastCommit, htmlDoc.GetCSRF()
+		}
+
+		t.Run("Not activated", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			email := unittest.AssertExistsAndLoadBean(t, &user_model.EmailAddress{ID: 35, UID: user.ID})
+			assert.False(t, email.IsActivated)
+
+			lastCommit, csrf := lastCommitAndCSRF()
+			req := NewRequestWithValues(t, "POST", link, map[string]string{
+				"_csrf":          csrf,
+				"last_commit":    lastCommit,
+				"tree_path":      "README.md",
+				"content":        "new_content",
+				"commit_choice":  "direct",
+				"commit_mail_id": fmt.Sprintf("%d", email.ID),
+			})
+			resp := session.MakeRequest(t, req, http.StatusOK)
+
+			htmlDoc := NewHTMLParser(t, resp.Body)
+			assert.Contains(t,
+				htmlDoc.doc.Find(".ui.negative.message").Text(),
+				translation.NewLocale("en-US").Tr("repo.editor.invalid_commit_mail"),
+			)
+		})
+
+		t.Run("Not belong to user", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			email := unittest.AssertExistsAndLoadBean(t, &user_model.EmailAddress{ID: 1, IsActivated: true})
+			assert.NotEqualValues(t, email.UID, user.ID)
+
+			lastCommit, csrf := lastCommitAndCSRF()
+			req := NewRequestWithValues(t, "POST", link, map[string]string{
+				"_csrf":          csrf,
+				"last_commit":    lastCommit,
+				"tree_path":      "README.md",
+				"content":        "new_content",
+				"commit_choice":  "direct",
+				"commit_mail_id": fmt.Sprintf("%d", email.ID),
+			})
+			resp := session.MakeRequest(t, req, http.StatusOK)
+
+			htmlDoc := NewHTMLParser(t, resp.Body)
+			assert.Contains(t,
+				htmlDoc.doc.Find(".ui.negative.message").Text(),
+				translation.NewLocale("en-US").Tr("repo.editor.invalid_commit_mail"),
+			)
+		})
+
+		repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+		gitRepo, _ := git.OpenRepository(git.DefaultContext, repo1.RepoPath())
+		defer gitRepo.Close()
+
+		t.Run("Placeholder mail", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			lastCommit, csrf := lastCommitAndCSRF()
+			req := NewRequestWithValues(t, "POST", link, map[string]string{
+				"_csrf":          csrf,
+				"last_commit":    lastCommit,
+				"tree_path":      "README.md",
+				"content":        "authored by placeholder mail",
+				"commit_choice":  "direct",
+				"commit_mail_id": "-1",
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			commit, err := gitRepo.GetCommitByPath("README.md")
+			assert.NoError(t, err)
+
+			fileContent, err := commit.GetFileContent("README.md", 64)
+			assert.NoError(t, err)
+			assert.EqualValues(t, "authored by placeholder mail", fileContent)
+
+			assert.EqualValues(t, "user2", commit.Author.Name)
+			assert.EqualValues(t, "[e-mail]", commit.Author.Email)
+			assert.EqualValues(t, "user2", commit.Committer.Name)
+			assert.EqualValues(t, "[e-mail]", commit.Committer.Email)
+		})
+
+		t.Run("Normal", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			// Require that the user has KeepEmailPrivate enabled, because it needs
+			// to be tested that even with this setting enabled, it will use the
+			// provided mail and not revert to the placeholder one.
+			assert.True(t, user.KeepEmailPrivate)
+
+			email := unittest.AssertExistsAndLoadBean(t, &user_model.EmailAddress{ID: 3, UID: user.ID, IsActivated: true})
+
+			lastCommit, csrf := lastCommitAndCSRF()
+			req := NewRequestWithValues(t, "POST", link, map[string]string{
+				"_csrf":          csrf,
+				"last_commit":    lastCommit,
+				"tree_path":      "README.md",
+				"content":        "authored by activated mail",
+				"commit_choice":  "direct",
+				"commit_mail_id": fmt.Sprintf("%d", email.ID),
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			commit, err := gitRepo.GetCommitByPath("README.md")
+			assert.NoError(t, err)
+
+			fileContent, err := commit.GetFileContent("README.md", 64)
+			assert.NoError(t, err)
+			assert.EqualValues(t, "authored by activated mail", fileContent)
+
+			assert.EqualValues(t, "user2", commit.Author.Name)
+			assert.EqualValues(t, email.Email, commit.Author.Email)
+			assert.EqualValues(t, "user2", commit.Committer.Name)
+			assert.EqualValues(t, email.Email, commit.Committer.Email)
+		})
+	})
+}

tests/integration/empty_repo_test.go

···
 	doc := NewHTMLParser(t, resp.Body).Find(`input[name="commit_choice"]`)
 	assert.Empty(t, doc.AttrOr("checked", "_no_"))
 	req = NewRequestWithValues(t, "POST", "/user30/empty/_new/"+setting.Repository.DefaultBranch, map[string]string{
-		"_csrf":         GetCSRF(t, session, "/user/settings"),
-		"commit_choice": "direct",
-		"tree_path":     "test-file.md",
-		"content":       "newly-added-test-file",
+		"_csrf":          GetCSRF(t, session, "/user/settings"),
+		"commit_choice":  "direct",
+		"tree_path":      "test-file.md",
+		"content":        "newly-added-test-file",
+		"commit_mail_id": "32",
 	})
 
 	resp = session.MakeRequest(t, req, http.StatusSeeOther)