Fix rendering of wiki page list if wiki repo contains other files (#3454)

* Fix rendering of wiki page list if wiki repo contains other files

* Improve wiki filename tests

4 files changed, 26 insertions, 2 deletions

diff --git a/models/error.go b/models/error.go
index cd96fa9256..a1c24f4ec0 100644
--- a/models/error.go
+++ b/models/error.go
@@ -216,6 +216,21 @@ func (err ErrWikiReservedName) Error() string {
 	return fmt.Sprintf("wiki title is reserved: %s", err.Title)
 }
 
+// ErrWikiInvalidFileName represents an invalid wiki file name.
+type ErrWikiInvalidFileName struct {
+	FileName string
+}
+
+// IsErrWikiInvalidFileName checks if an error is an ErrWikiInvalidFileName.
+func IsErrWikiInvalidFileName(err error) bool {
+	_, ok := err.(ErrWikiInvalidFileName)
+	return ok
+}
+
+func (err ErrWikiInvalidFileName) Error() string {
+	return fmt.Sprintf("Invalid wiki filename: %s", err.FileName)
+}
+
 // __________     ___.   .__  .__          ____  __.
 // \______   \__ _\_ |__ |  | |__| ____   |    |/ _|____ ___.__.
 //  |     ___/  |  \ __ \|  | |  |/ ___\  |      <_/ __ <   |  |
diff --git a/models/wiki.go b/models/wiki.go
index 3a39daf0f6..3e0d1b9ce8 100644
--- a/models/wiki.go
+++ b/models/wiki.go
@@ -45,7 +45,7 @@ func WikiNameToFilename(name string) string {
 // WikiFilenameToName converts a wiki filename to its corresponding page name.
 func WikiFilenameToName(filename string) (string, error) {
 	if !strings.HasSuffix(filename, ".md") {
-		return "", fmt.Errorf("Invalid wiki filename: %s", filename)
+		return "", ErrWikiInvalidFileName{filename}
 	}
 	basename := filename[:len(filename)-3]
 	unescaped, err := url.QueryUnescape(basename)
diff --git a/models/wiki_test.go b/models/wiki_test.go
index 80f6df55ec..a142a58f35 100644
--- a/models/wiki_test.go
+++ b/models/wiki_test.go
@@ -77,11 +77,14 @@ func TestWikiFilenameToName(t *testing.T) {
 	for _, badFilename := range []string{
 		"nofileextension",
 		"wrongfileextension.txt",
-		"badescaping%%.md",
 	} {
 		_, err := WikiFilenameToName(badFilename)
 		assert.Error(t, err)
+		assert.True(t, IsErrWikiInvalidFileName(err))
 	}
+	_, err := WikiFilenameToName("badescaping%%.md")
+	assert.Error(t, err)
+	assert.False(t, IsErrWikiInvalidFileName(err))
 }
 
 func TestWikiNameToFilenameToName(t *testing.T) {
diff --git a/routers/repo/wiki.go b/routers/repo/wiki.go
index 7befe7c687..87cb9f3037 100644
--- a/routers/repo/wiki.go
+++ b/routers/repo/wiki.go
@@ -128,6 +128,9 @@ func renderWikiPage(ctx *context.Context, isViewPage bool) (*git.Repository, *gi
 			}
 			wikiName, err := models.WikiFilenameToName(entry.Name())
 			if err != nil {
+				if models.IsErrWikiInvalidFileName(err) {
+					continue
+				}
 				ctx.ServerError("WikiFilenameToName", err)
 				return nil, nil
 			} else if wikiName == "_Sidebar" || wikiName == "_Footer" {
@@ -262,6 +265,9 @@ func WikiPages(ctx *context.Context) {
 		}
 		wikiName, err := models.WikiFilenameToName(entry.Name())
 		if err != nil {
+			if models.IsErrWikiInvalidFileName(err) {
+				continue
+			}
 			ctx.ServerError("WikiFilenameToName", err)
 			return
 		}