Adding upstream version 9.0.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>

3 files changed, 948 insertions, 0 deletions

diff --git a/services/wiki/wiki.go b/services/wiki/wiki.go
new file mode 100644
index 0000000..aba1115
--- /dev/null
+++ b/services/wiki/wiki.go
@@ -0,0 +1,449 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package wiki
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	system_model "code.gitea.io/gitea/models/system"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/gitrepo"
+	"code.gitea.io/gitea/modules/log"
+	repo_module "code.gitea.io/gitea/modules/repository"
+	"code.gitea.io/gitea/modules/sync"
+	asymkey_service "code.gitea.io/gitea/services/asymkey"
+	repo_service "code.gitea.io/gitea/services/repository"
+)
+
+// TODO: use clustered lock (unique queue? or *abuse* cache)
+var wikiWorkingPool = sync.NewExclusivePool()
+
+const (
+	DefaultRemote = "origin"
+)
+
+// InitWiki initializes a wiki for repository,
+// it does nothing when repository already has wiki.
+func InitWiki(ctx context.Context, repo *repo_model.Repository) error {
+	if repo.HasWiki() {
+		return nil
+	}
+
+	branch := repo.GetWikiBranchName()
+
+	if err := git.InitRepository(ctx, repo.WikiPath(), true, repo.ObjectFormatName); err != nil {
+		return fmt.Errorf("InitRepository: %w", err)
+	} else if err = repo_module.CreateDelegateHooks(repo.WikiPath()); err != nil {
+		return fmt.Errorf("createDelegateHooks: %w", err)
+	} else if _, _, err = git.NewCommand(ctx, "symbolic-ref", "HEAD").AddDynamicArguments(git.BranchPrefix + branch).RunStdString(&git.RunOpts{Dir: repo.WikiPath()}); err != nil {
+		return fmt.Errorf("unable to set default wiki branch to %s: %w", branch, err)
+	}
+	return nil
+}
+
+// NormalizeWikiBranch renames a repository wiki's branch to `setting.Repository.DefaultBranch`
+func NormalizeWikiBranch(ctx context.Context, repo *repo_model.Repository, to string) error {
+	from := repo.GetWikiBranchName()
+
+	if err := repo.MustNotBeArchived(); err != nil {
+		return err
+	}
+
+	updateDB := func() error {
+		repo.WikiBranch = to
+		return repo_model.UpdateRepositoryCols(ctx, repo, "wiki_branch")
+	}
+
+	if !repo.HasWiki() {
+		return updateDB()
+	}
+
+	if from == to {
+		return nil
+	}
+
+	gitRepo, err := git.OpenRepository(ctx, repo.WikiPath())
+	if err != nil {
+		return err
+	}
+	defer gitRepo.Close()
+
+	if gitRepo.IsBranchExist(to) {
+		return nil
+	}
+
+	if !gitRepo.IsBranchExist(from) {
+		return nil
+	}
+
+	if err := gitRepo.RenameBranch(from, to); err != nil {
+		return err
+	}
+
+	if err := gitrepo.SetDefaultBranch(ctx, repo, to); err != nil {
+		return err
+	}
+
+	return updateDB()
+}
+
+// prepareGitPath try to find a suitable file path with file name by the given raw wiki name.
+// return: existence, prepared file path with name, error
+func prepareGitPath(gitRepo *git.Repository, branch string, wikiPath WebPath) (bool, string, error) {
+	unescaped := string(wikiPath) + ".md"
+	gitPath := WebPathToGitPath(wikiPath)
+
+	// Look for both files
+	filesInIndex, err := gitRepo.LsTree(branch, unescaped, gitPath)
+	if err != nil {
+		if strings.Contains(err.Error(), "Not a valid object name "+branch) {
+			return false, gitPath, nil
+		}
+		log.Error("%v", err)
+		return false, gitPath, err
+	}
+
+	foundEscaped := false
+	for _, filename := range filesInIndex {
+		switch filename {
+		case unescaped:
+			// if we find the unescaped file return it
+			return true, unescaped, nil
+		case gitPath:
+			foundEscaped = true
+		}
+	}
+
+	// If not return whether the escaped file exists, and the escaped filename to keep backwards compatibility.
+	return foundEscaped, gitPath, nil
+}
+
+// updateWikiPage adds a new page or edits an existing page in repository wiki.
+func updateWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, oldWikiName, newWikiName WebPath, content, message string, isNew bool) (err error) {
+	err = repo.MustNotBeArchived()
+	if err != nil {
+		return err
+	}
+
+	if err = validateWebPath(newWikiName); err != nil {
+		return err
+	}
+	wikiWorkingPool.CheckIn(fmt.Sprint(repo.ID))
+	defer wikiWorkingPool.CheckOut(fmt.Sprint(repo.ID))
+
+	if err = InitWiki(ctx, repo); err != nil {
+		return fmt.Errorf("InitWiki: %w", err)
+	}
+
+	hasMasterBranch := git.IsBranchExist(ctx, repo.WikiPath(), repo.GetWikiBranchName())
+
+	basePath, err := repo_module.CreateTemporaryPath("update-wiki")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err := repo_module.RemoveTemporaryPath(basePath); err != nil {
+			log.Error("Merge: RemoveTemporaryPath: %s", err)
+		}
+	}()
+
+	cloneOpts := git.CloneRepoOptions{
+		Bare:   true,
+		Shared: true,
+	}
+
+	if hasMasterBranch {
+		cloneOpts.Branch = repo.GetWikiBranchName()
+	}
+
+	if err := git.Clone(ctx, repo.WikiPath(), basePath, cloneOpts); err != nil {
+		log.Error("Failed to clone repository: %s (%v)", repo.FullName(), err)
+		return fmt.Errorf("failed to clone repository: %s (%w)", repo.FullName(), err)
+	}
+
+	gitRepo, err := git.OpenRepository(ctx, basePath)
+	if err != nil {
+		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
+		return fmt.Errorf("failed to open new temporary repository in: %s %w", basePath, err)
+	}
+	defer gitRepo.Close()
+
+	if hasMasterBranch {
+		if err := gitRepo.ReadTreeToIndex("HEAD"); err != nil {
+			log.Error("Unable to read HEAD tree to index in: %s %v", basePath, err)
+			return fmt.Errorf("fnable to read HEAD tree to index in: %s %w", basePath, err)
+		}
+	}
+
+	isWikiExist, newWikiPath, err := prepareGitPath(gitRepo, repo.GetWikiBranchName(), newWikiName)
+	if err != nil {
+		return err
+	}
+
+	if isNew {
+		if isWikiExist {
+			return repo_model.ErrWikiAlreadyExist{
+				Title: newWikiPath,
+			}
+		}
+	} else {
+		// avoid check existence again if wiki name is not changed since gitRepo.LsFiles(...) is not free.
+		isOldWikiExist := true
+		oldWikiPath := newWikiPath
+		if oldWikiName != newWikiName {
+			isOldWikiExist, oldWikiPath, err = prepareGitPath(gitRepo, repo.GetWikiBranchName(), oldWikiName)
+			if err != nil {
+				return err
+			}
+		}
+
+		if isOldWikiExist {
+			err := gitRepo.RemoveFilesFromIndex(oldWikiPath)
+			if err != nil {
+				log.Error("RemoveFilesFromIndex failed: %v", err)
+				return err
+			}
+		}
+	}
+
+	// FIXME: The wiki doesn't have lfs support at present - if this changes need to check attributes here
+
+	objectHash, err := gitRepo.HashObject(strings.NewReader(content))
+	if err != nil {
+		log.Error("HashObject failed: %v", err)
+		return err
+	}
+
+	if err := gitRepo.AddObjectToIndex("100644", objectHash, newWikiPath); err != nil {
+		log.Error("AddObjectToIndex failed: %v", err)
+		return err
+	}
+
+	tree, err := gitRepo.WriteTree()
+	if err != nil {
+		log.Error("WriteTree failed: %v", err)
+		return err
+	}
+
+	commitTreeOpts := git.CommitTreeOpts{
+		Message: message,
+	}
+
+	committer := doer.NewGitSig()
+
+	sign, signingKey, signer, _ := asymkey_service.SignWikiCommit(ctx, repo, doer)
+	if sign {
+		commitTreeOpts.KeyID = signingKey
+		if repo.GetTrustModel() == repo_model.CommitterTrustModel || repo.GetTrustModel() == repo_model.CollaboratorCommitterTrustModel {
+			committer = signer
+		}
+	} else {
+		commitTreeOpts.NoGPGSign = true
+	}
+	if hasMasterBranch {
+		commitTreeOpts.Parents = []string{"HEAD"}
+	}
+
+	commitHash, err := gitRepo.CommitTree(doer.NewGitSig(), committer, tree, commitTreeOpts)
+	if err != nil {
+		log.Error("CommitTree failed: %v", err)
+		return err
+	}
+
+	if err := git.Push(gitRepo.Ctx, basePath, git.PushOptions{
+		Remote: DefaultRemote,
+		Branch: fmt.Sprintf("%s:%s%s", commitHash.String(), git.BranchPrefix, repo.GetWikiBranchName()),
+		Env: repo_module.FullPushingEnvironment(
+			doer,
+			doer,
+			repo,
+			repo.Name+".wiki",
+			0,
+		),
+	}); err != nil {
+		log.Error("Push failed: %v", err)
+		if git.IsErrPushOutOfDate(err) || git.IsErrPushRejected(err) {
+			return err
+		}
+		return fmt.Errorf("failed to push: %w", err)
+	}
+
+	return nil
+}
+
+// AddWikiPage adds a new wiki page with a given wikiPath.
+func AddWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, wikiName WebPath, content, message string) error {
+	return updateWikiPage(ctx, doer, repo, "", wikiName, content, message, true)
+}
+
+// EditWikiPage updates a wiki page identified by its wikiPath,
+// optionally also changing wikiPath.
+func EditWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, oldWikiName, newWikiName WebPath, content, message string) error {
+	return updateWikiPage(ctx, doer, repo, oldWikiName, newWikiName, content, message, false)
+}
+
+// DeleteWikiPage deletes a wiki page identified by its path.
+func DeleteWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, wikiName WebPath) (err error) {
+	err = repo.MustNotBeArchived()
+	if err != nil {
+		return err
+	}
+
+	wikiWorkingPool.CheckIn(fmt.Sprint(repo.ID))
+	defer wikiWorkingPool.CheckOut(fmt.Sprint(repo.ID))
+
+	if err = InitWiki(ctx, repo); err != nil {
+		return fmt.Errorf("InitWiki: %w", err)
+	}
+
+	basePath, err := repo_module.CreateTemporaryPath("update-wiki")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err := repo_module.RemoveTemporaryPath(basePath); err != nil {
+			log.Error("Merge: RemoveTemporaryPath: %s", err)
+		}
+	}()
+
+	if err := git.Clone(ctx, repo.WikiPath(), basePath, git.CloneRepoOptions{
+		Bare:   true,
+		Shared: true,
+		Branch: repo.GetWikiBranchName(),
+	}); err != nil {
+		log.Error("Failed to clone repository: %s (%v)", repo.FullName(), err)
+		return fmt.Errorf("failed to clone repository: %s (%w)", repo.FullName(), err)
+	}
+
+	gitRepo, err := git.OpenRepository(ctx, basePath)
+	if err != nil {
+		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
+		return fmt.Errorf("failed to open new temporary repository in: %s %w", basePath, err)
+	}
+	defer gitRepo.Close()
+
+	if err := gitRepo.ReadTreeToIndex("HEAD"); err != nil {
+		log.Error("Unable to read HEAD tree to index in: %s %v", basePath, err)
+		return fmt.Errorf("unable to read HEAD tree to index in: %s %w", basePath, err)
+	}
+
+	found, wikiPath, err := prepareGitPath(gitRepo, repo.GetWikiBranchName(), wikiName)
+	if err != nil {
+		return err
+	}
+	if found {
+		err := gitRepo.RemoveFilesFromIndex(wikiPath)
+		if err != nil {
+			return err
+		}
+	} else {
+		return os.ErrNotExist
+	}
+
+	// FIXME: The wiki doesn't have lfs support at present - if this changes need to check attributes here
+
+	tree, err := gitRepo.WriteTree()
+	if err != nil {
+		return err
+	}
+	message := fmt.Sprintf("Delete page %q", wikiName)
+	commitTreeOpts := git.CommitTreeOpts{
+		Message: message,
+		Parents: []string{"HEAD"},
+	}
+
+	committer := doer.NewGitSig()
+
+	sign, signingKey, signer, _ := asymkey_service.SignWikiCommit(ctx, repo, doer)
+	if sign {
+		commitTreeOpts.KeyID = signingKey
+		if repo.GetTrustModel() == repo_model.CommitterTrustModel || repo.GetTrustModel() == repo_model.CollaboratorCommitterTrustModel {
+			committer = signer
+		}
+	} else {
+		commitTreeOpts.NoGPGSign = true
+	}
+
+	commitHash, err := gitRepo.CommitTree(doer.NewGitSig(), committer, tree, commitTreeOpts)
+	if err != nil {
+		return err
+	}
+
+	if err := git.Push(gitRepo.Ctx, basePath, git.PushOptions{
+		Remote: DefaultRemote,
+		Branch: fmt.Sprintf("%s:%s%s", commitHash.String(), git.BranchPrefix, repo.GetWikiBranchName()),
+		Env: repo_module.FullPushingEnvironment(
+			doer,
+			doer,
+			repo,
+			repo.Name+".wiki",
+			0,
+		),
+	}); err != nil {
+		if git.IsErrPushOutOfDate(err) || git.IsErrPushRejected(err) {
+			return err
+		}
+		return fmt.Errorf("Push: %w", err)
+	}
+
+	return nil
+}
+
+// DeleteWiki removes the actual and local copy of repository wiki.
+func DeleteWiki(ctx context.Context, repo *repo_model.Repository) error {
+	if err := repo_service.UpdateRepositoryUnits(ctx, repo, nil, []unit.Type{unit.TypeWiki}); err != nil {
+		return err
+	}
+
+	system_model.RemoveAllWithNotice(ctx, "Delete repository wiki", repo.WikiPath())
+	return nil
+}
+
+type SearchContentsResult struct {
+	*git.GrepResult
+	Title string
+}
+
+func SearchWikiContents(ctx context.Context, repo *repo_model.Repository, keyword string) ([]SearchContentsResult, error) {
+	gitRepo, err := git.OpenRepository(ctx, repo.WikiPath())
+	if err != nil {
+		return nil, err
+	}
+	defer gitRepo.Close()
+
+	grepRes, err := git.GrepSearch(ctx, gitRepo, keyword, git.GrepOptions{
+		ContextLineNumber: 0,
+		IsFuzzy:           true,
+		RefName:           repo.GetWikiBranchName(),
+		MaxResultLimit:    10,
+		MatchesPerFile:    3,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]SearchContentsResult, 0, len(grepRes))
+	for _, entry := range grepRes {
+		wp, err := GitPathToWebPath(entry.Filename)
+		if err != nil {
+			return nil, err
+		}
+		_, title := WebPathToUserTitle(wp)
+
+		res = append(res, SearchContentsResult{
+			GrepResult: entry,
+			Title:      title,
+		})
+	}
+
+	return res, nil
+}
diff --git a/services/wiki/wiki_path.go b/services/wiki/wiki_path.go
new file mode 100644
index 0000000..74c7064
--- /dev/null
+++ b/services/wiki/wiki_path.go
@@ -0,0 +1,172 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package wiki
+
+import (
+	"net/url"
+	"path"
+	"strings"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/convert"
+)
+
+// To define the wiki related concepts:
+// * Display Segment: the text what user see for a wiki page (aka, the title):
+//   - "Home Page"
+//   - "100% Free"
+//   - "2000-01-02 meeting"
+// * Web Path:
+//   - "/wiki/Home-Page"
+//   - "/wiki/100%25+Free"
+//   - "/wiki/2000-01-02+meeting.-"
+//   - If a segment has a suffix "DashMarker(.-)", it means that there is no dash-space conversion for this segment.
+//   - If a WebPath is a "*.md" pattern, then use the unescaped value directly as GitPath, to make users can access the raw file.
+// * Git Path (only space doesn't need to be escaped):
+//   - "/.wiki.git/Home-Page.md"
+//   - "/.wiki.git/100%25 Free.md"
+//   - "/.wiki.git/2000-01-02 meeting.-.md"
+// TODO: support subdirectory in the future
+//
+// Although this package now has the ability to support subdirectory, but the route package doesn't:
+// * Double-escaping problem: the URL "/wiki/abc%2Fdef" becomes "/wiki/abc/def" by ctx.Params, which is incorrect
+//   * This problem should have been 99% fixed, but it needs more tests.
+// * The old wiki code's behavior is always using %2F, instead of subdirectory, so there are a lot of legacy "%2F" files in user wikis.
+
+type WebPath string
+
+var reservedWikiNames = []string{"_pages", "_new", "_edit", "raw"}
+
+func validateWebPath(name WebPath) error {
+	for _, s := range WebPathSegments(name) {
+		if util.SliceContainsString(reservedWikiNames, s) {
+			return repo_model.ErrWikiReservedName{Title: s}
+		}
+	}
+	return nil
+}
+
+func hasDashMarker(s string) bool {
+	return strings.HasSuffix(s, ".-")
+}
+
+func removeDashMarker(s string) string {
+	return strings.TrimSuffix(s, ".-")
+}
+
+func addDashMarker(s string) string {
+	return s + ".-"
+}
+
+func unescapeSegment(s string) (string, error) {
+	if hasDashMarker(s) {
+		s = removeDashMarker(s)
+	} else {
+		s = strings.ReplaceAll(s, "-", " ")
+	}
+	unescaped, err := url.QueryUnescape(s)
+	if err != nil {
+		return s, err // un-escaping failed, but it's still safe to return the original string, because it is only a title for end users
+	}
+	return unescaped, nil
+}
+
+func escapeSegToWeb(s string, hadDashMarker bool) string {
+	if hadDashMarker || strings.Contains(s, "-") || strings.HasSuffix(s, ".md") {
+		s = addDashMarker(s)
+	} else {
+		s = strings.ReplaceAll(s, " ", "-")
+	}
+	s = url.QueryEscape(s)
+	return s
+}
+
+func WebPathSegments(s WebPath) []string {
+	a := strings.Split(string(s), "/")
+	for i := range a {
+		a[i], _ = unescapeSegment(a[i])
+	}
+	return a
+}
+
+func WebPathToGitPath(s WebPath) string {
+	if strings.HasSuffix(string(s), ".md") {
+		ret, _ := url.PathUnescape(string(s))
+		return util.PathJoinRelX(ret)
+	}
+
+	a := strings.Split(string(s), "/")
+	for i := range a {
+		shouldAddDashMarker := hasDashMarker(a[i])
+		a[i], _ = unescapeSegment(a[i])
+		a[i] = escapeSegToWeb(a[i], shouldAddDashMarker)
+		a[i] = strings.ReplaceAll(a[i], "%20", " ") // space is safe to be kept in git path
+		a[i] = strings.ReplaceAll(a[i], "+", " ")
+	}
+	return strings.Join(a, "/") + ".md"
+}
+
+func GitPathToWebPath(s string) (wp WebPath, err error) {
+	if !strings.HasSuffix(s, ".md") {
+		return "", repo_model.ErrWikiInvalidFileName{FileName: s}
+	}
+	s = strings.TrimSuffix(s, ".md")
+	a := strings.Split(s, "/")
+	for i := range a {
+		shouldAddDashMarker := hasDashMarker(a[i])
+		if a[i], err = unescapeSegment(a[i]); err != nil {
+			return "", err
+		}
+		a[i] = escapeSegToWeb(a[i], shouldAddDashMarker)
+	}
+	return WebPath(strings.Join(a, "/")), nil
+}
+
+func WebPathToUserTitle(s WebPath) (dir, display string) {
+	dir = path.Dir(string(s))
+	display = path.Base(string(s))
+	if strings.HasSuffix(display, ".md") {
+		display = strings.TrimSuffix(display, ".md")
+		display, _ = url.PathUnescape(display)
+	}
+	display, _ = unescapeSegment(display)
+	return dir, display
+}
+
+func WebPathToURLPath(s WebPath) string {
+	return string(s)
+}
+
+func WebPathFromRequest(s string) WebPath {
+	s = util.PathJoinRelX(s)
+	// The old wiki code's behavior is always using %2F, instead of subdirectory.
+	s = strings.ReplaceAll(s, "/", "%2F")
+	return WebPath(s)
+}
+
+func UserTitleToWebPath(base, title string) WebPath {
+	// TODO: no support for subdirectory, because the old wiki code's behavior is always using %2F, instead of subdirectory.
+	// So we do not add the support for writing slashes in title at the moment.
+	title = strings.TrimSpace(title)
+	title = util.PathJoinRelX(base, escapeSegToWeb(title, false))
+	if title == "" || title == "." {
+		title = "unnamed"
+	}
+	return WebPath(title)
+}
+
+// ToWikiPageMetaData converts meta information to a WikiPageMetaData
+func ToWikiPageMetaData(wikiName WebPath, lastCommit *git.Commit, repo *repo_model.Repository) *api.WikiPageMetaData {
+	subURL := string(wikiName)
+	_, title := WebPathToUserTitle(wikiName)
+	return &api.WikiPageMetaData{
+		Title:      title,
+		HTMLURL:    util.URLJoin(repo.HTMLURL(), "wiki", subURL),
+		SubURL:     subURL,
+		LastCommit: convert.ToWikiCommit(lastCommit),
+	}
+}
diff --git a/services/wiki/wiki_test.go b/services/wiki/wiki_test.go
new file mode 100644
index 0000000..efcc13d
--- /dev/null
+++ b/services/wiki/wiki_test.go
@@ -0,0 +1,327 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package wiki
+
+import (
+	"math/rand"
+	"strings"
+	"testing"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/gitrepo"
+
+	_ "code.gitea.io/gitea/models/actions"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m)
+}
+
+func TestWebPathSegments(t *testing.T) {
+	a := WebPathSegments("a%2Fa/b+c/d-e/f-g.-")
+	assert.EqualValues(t, []string{"a/a", "b c", "d e", "f-g"}, a)
+}
+
+func TestUserTitleToWebPath(t *testing.T) {
+	type test struct {
+		Expected  string
+		UserTitle string
+	}
+	for _, test := range []test{
+		{"unnamed", ""},
+		{"unnamed", "."},
+		{"unnamed", ".."},
+		{"wiki-name", "wiki name"},
+		{"title.md.-", "title.md"},
+		{"wiki-name.-", "wiki-name"},
+		{"the+wiki-name.-", "the wiki-name"},
+		{"a%2Fb", "a/b"},
+		{"a%25b", "a%b"},
+	} {
+		assert.EqualValues(t, test.Expected, UserTitleToWebPath("", test.UserTitle))
+	}
+}
+
+func TestWebPathToDisplayName(t *testing.T) {
+	type test struct {
+		Expected string
+		WebPath  WebPath
+	}
+	for _, test := range []test{
+		{"wiki name", "wiki-name"},
+		{"wiki-name", "wiki-name.-"},
+		{"name with / slash", "name-with %2F slash"},
+		{"name with % percent", "name-with %25 percent"},
+		{"2000-01-02 meeting", "2000-01-02+meeting.-.md"},
+		{"a b", "a%20b.md"},
+	} {
+		_, displayName := WebPathToUserTitle(test.WebPath)
+		assert.EqualValues(t, test.Expected, displayName)
+	}
+}
+
+func TestWebPathToGitPath(t *testing.T) {
+	type test struct {
+		Expected string
+		WikiName WebPath
+	}
+	for _, test := range []test{
+		{"wiki-name.md", "wiki%20name"},
+		{"wiki-name.md", "wiki+name"},
+		{"wiki name.md", "wiki%20name.md"},
+		{"wiki%20name.md", "wiki%2520name.md"},
+		{"2000-01-02-meeting.md", "2000-01-02+meeting"},
+		{"2000-01-02 meeting.-.md", "2000-01-02%20meeting.-"},
+	} {
+		assert.EqualValues(t, test.Expected, WebPathToGitPath(test.WikiName))
+	}
+}
+
+func TestGitPathToWebPath(t *testing.T) {
+	type test struct {
+		Expected string
+		Filename string
+	}
+	for _, test := range []test{
+		{"hello-world", "hello-world.md"}, // this shouldn't happen, because it should always have a ".-" suffix
+		{"hello-world", "hello world.md"},
+		{"hello-world.-", "hello-world.-.md"},
+		{"hello+world.-", "hello world.-.md"},
+		{"symbols-%2F", "symbols %2F.md"},
+	} {
+		name, err := GitPathToWebPath(test.Filename)
+		require.NoError(t, err)
+		assert.EqualValues(t, test.Expected, name)
+	}
+	for _, badFilename := range []string{
+		"nofileextension",
+		"wrongfileextension.txt",
+	} {
+		_, err := GitPathToWebPath(badFilename)
+		require.Error(t, err)
+		assert.True(t, repo_model.IsErrWikiInvalidFileName(err))
+	}
+	_, err := GitPathToWebPath("badescaping%%.md")
+	require.Error(t, err)
+	assert.False(t, repo_model.IsErrWikiInvalidFileName(err))
+}
+
+func TestUserWebGitPathConsistency(t *testing.T) {
+	maxLen := 20
+	b := make([]byte, maxLen)
+	for i := 0; i < 1000; i++ {
+		l := rand.Intn(maxLen)
+		for j := 0; j < l; j++ {
+			r := rand.Intn(0x80-0x20) + 0x20
+			b[j] = byte(r)
+		}
+
+		userTitle := strings.TrimSpace(string(b[:l]))
+		if userTitle == "" || userTitle == "." || userTitle == ".." {
+			continue
+		}
+		webPath := UserTitleToWebPath("", userTitle)
+		gitPath := WebPathToGitPath(webPath)
+
+		webPath1, _ := GitPathToWebPath(gitPath)
+		_, userTitle1 := WebPathToUserTitle(webPath1)
+		gitPath1 := WebPathToGitPath(webPath1)
+
+		assert.EqualValues(t, userTitle, userTitle1, "UserTitle for userTitle: %q", userTitle)
+		assert.EqualValues(t, webPath, webPath1, "WebPath for userTitle: %q", userTitle)
+		assert.EqualValues(t, gitPath, gitPath1, "GitPath for userTitle: %q", userTitle)
+	}
+}
+
+func TestRepository_InitWiki(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	// repo1 already has a wiki
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	require.NoError(t, InitWiki(git.DefaultContext, repo1))
+
+	// repo2 does not already have a wiki
+	repo2 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 2})
+	require.NoError(t, InitWiki(git.DefaultContext, repo2))
+	assert.True(t, repo2.HasWiki())
+}
+
+func TestRepository_AddWikiPage(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	const wikiContent = "This is the wiki content"
+	const commitMsg = "Commit message"
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	for _, userTitle := range []string{
+		"Another page",
+		"Here's a <tag> and a/slash",
+	} {
+		t.Run("test wiki exist: "+userTitle, func(t *testing.T) {
+			webPath := UserTitleToWebPath("", userTitle)
+			require.NoError(t, AddWikiPage(git.DefaultContext, doer, repo, webPath, wikiContent, commitMsg))
+			// Now need to show that the page has been added:
+			gitRepo, err := gitrepo.OpenWikiRepository(git.DefaultContext, repo)
+			require.NoError(t, err)
+
+			defer gitRepo.Close()
+			masterTree, err := gitRepo.GetTree("master")
+			require.NoError(t, err)
+			gitPath := WebPathToGitPath(webPath)
+			entry, err := masterTree.GetTreeEntryByPath(gitPath)
+			require.NoError(t, err)
+			assert.EqualValues(t, gitPath, entry.Name(), "%s not added correctly", userTitle)
+		})
+	}
+
+	t.Run("check wiki already exist", func(t *testing.T) {
+		t.Parallel()
+		// test for already-existing wiki name
+		err := AddWikiPage(git.DefaultContext, doer, repo, "Home", wikiContent, commitMsg)
+		require.Error(t, err)
+		assert.True(t, repo_model.IsErrWikiAlreadyExist(err))
+	})
+
+	t.Run("check wiki reserved name", func(t *testing.T) {
+		t.Parallel()
+		// test for reserved wiki name
+		err := AddWikiPage(git.DefaultContext, doer, repo, "_edit", wikiContent, commitMsg)
+		require.Error(t, err)
+		assert.True(t, repo_model.IsErrWikiReservedName(err))
+	})
+}
+
+func TestRepository_EditWikiPage(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	const newWikiContent = "This is the new content"
+	const commitMsg = "Commit message"
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	for _, newWikiName := range []string{
+		"Home", // same name as before
+		"New home",
+		"New/name/with/slashes",
+	} {
+		webPath := UserTitleToWebPath("", newWikiName)
+		unittest.PrepareTestEnv(t)
+		require.NoError(t, EditWikiPage(git.DefaultContext, doer, repo, "Home", webPath, newWikiContent, commitMsg))
+
+		// Now need to show that the page has been added:
+		gitRepo, err := gitrepo.OpenWikiRepository(git.DefaultContext, repo)
+		require.NoError(t, err)
+		masterTree, err := gitRepo.GetTree("master")
+		require.NoError(t, err)
+		gitPath := WebPathToGitPath(webPath)
+		entry, err := masterTree.GetTreeEntryByPath(gitPath)
+		require.NoError(t, err)
+		assert.EqualValues(t, gitPath, entry.Name(), "%s not edited correctly", newWikiName)
+
+		if newWikiName != "Home" {
+			_, err := masterTree.GetTreeEntryByPath("Home.md")
+			require.Error(t, err)
+		}
+		gitRepo.Close()
+	}
+}
+
+func TestRepository_DeleteWikiPage(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	require.NoError(t, DeleteWikiPage(git.DefaultContext, doer, repo, "Home"))
+
+	// Now need to show that the page has been added:
+	gitRepo, err := gitrepo.OpenWikiRepository(git.DefaultContext, repo)
+	require.NoError(t, err)
+	defer gitRepo.Close()
+	masterTree, err := gitRepo.GetTree("master")
+	require.NoError(t, err)
+	gitPath := WebPathToGitPath("Home")
+	_, err = masterTree.GetTreeEntryByPath(gitPath)
+	require.Error(t, err)
+}
+
+func TestPrepareWikiFileName(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	gitRepo, err := gitrepo.OpenWikiRepository(git.DefaultContext, repo)
+	require.NoError(t, err)
+
+	defer gitRepo.Close()
+
+	tests := []struct {
+		name      string
+		arg       string
+		existence bool
+		wikiPath  string
+		wantErr   bool
+	}{{
+		name:      "add suffix",
+		arg:       "Home",
+		existence: true,
+		wikiPath:  "Home.md",
+		wantErr:   false,
+	}, {
+		name:      "test special chars",
+		arg:       "home of and & or wiki page!",
+		existence: false,
+		wikiPath:  "home-of-and-%26-or-wiki-page%21.md",
+		wantErr:   false,
+	}}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			webPath := UserTitleToWebPath("", tt.arg)
+			existence, newWikiPath, err := prepareGitPath(gitRepo, "master", webPath)
+			if (err != nil) != tt.wantErr {
+				require.NoError(t, err)
+				return
+			}
+			if existence != tt.existence {
+				if existence {
+					t.Errorf("expect to find no escaped file but we detect one")
+				} else {
+					t.Errorf("expect to find an escaped file but we could not detect one")
+				}
+			}
+			assert.EqualValues(t, tt.wikiPath, newWikiPath)
+		})
+	}
+}
+
+func TestPrepareWikiFileName_FirstPage(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+
+	// Now create a temporaryDirectory
+	tmpDir := t.TempDir()
+
+	err := git.InitRepository(git.DefaultContext, tmpDir, true, git.Sha1ObjectFormat.Name())
+	require.NoError(t, err)
+
+	gitRepo, err := git.OpenRepository(git.DefaultContext, tmpDir)
+	require.NoError(t, err)
+
+	defer gitRepo.Close()
+
+	existence, newWikiPath, err := prepareGitPath(gitRepo, "master", "Home")
+	assert.False(t, existence)
+	require.NoError(t, err)
+	assert.EqualValues(t, "Home.md", newWikiPath)
+}
+
+func TestWebPathConversion(t *testing.T) {
+	assert.Equal(t, "path/wiki", WebPathToURLPath(WebPath("path/wiki")))
+	assert.Equal(t, "wiki", WebPathToURLPath(WebPath("wiki")))
+	assert.Equal(t, "", WebPathToURLPath(WebPath("")))
+}
+
+func TestWebPathFromRequest(t *testing.T) {
+	assert.Equal(t, WebPath("a%2Fb"), WebPathFromRequest("a/b"))
+	assert.Equal(t, WebPath("a"), WebPathFromRequest("a"))
+	assert.Equal(t, WebPath("b"), WebPathFromRequest("a/../b"))
+}