Allow markdown files to read from the LFS (#5787)

This PR makes it possible for the markdown renderer to render images and media straight from the LFS.

Fix #5746

Signed-off-by: Andrew Thornton [art27@cantab.net](mailto:art27@cantab.net)

integrations/download_test.go

@@ -22,3 +22,15 @@ func TestDownloadByID(t *testing.T) {
 
 	assert.Equal(t, "# repo1\n\nDescription for repo1", resp.Body.String())
 }
+
+func TestDownloadByIDMedia(t *testing.T) {
+	prepareTestEnv(t)
+
+	session := loginUser(t, "user2")
+
+	// Request raw blob
+	req := NewRequest(t, "GET", "/user2/repo1/media/blob/4b4851ad51df6a7d9f25c979345979eaeb5b349f")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	assert.Equal(t, "# repo1\n\nDescription for repo1", resp.Body.String())
+}

integrations/git_test.go

@@ -8,13 +8,16 @@ import (
 	"crypto/rand"
 	"fmt"
 	"io/ioutil"
+	"net/http"
 	"net/url"
 	"os"
+	"path"
 	"path/filepath"
 	"testing"
 	"time"
 
 	"code.gitea.io/git"
+	"code.gitea.io/gitea/models"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -39,6 +42,8 @@ func testGit(t *testing.T, u *url.URL) {
 		httpContext.Reponame = "repo-tmp-17"
 
 		dstPath, err := ioutil.TempDir("", httpContext.Reponame)
+		var little, big, littleLFS, bigLFS string
+
 		assert.NoError(t, err)
 		defer os.RemoveAll(dstPath)
 		t.Run("Standard", func(t *testing.T) {
@@ -53,10 +58,10 @@ func testGit(t *testing.T, u *url.URL) {
 
 			t.Run("PushCommit", func(t *testing.T) {
 				t.Run("Little", func(t *testing.T) {
-					commitAndPush(t, littleSize, dstPath)
+					little = commitAndPush(t, littleSize, dstPath)
 				})
 				t.Run("Big", func(t *testing.T) {
-					commitAndPush(t, bigSize, dstPath)
+					big = commitAndPush(t, bigSize, dstPath)
 				})
 			})
 		})
@@ -71,16 +76,60 @@ func testGit(t *testing.T, u *url.URL) {
 				assert.NoError(t, err)
 
 				t.Run("Little", func(t *testing.T) {
-					commitAndPush(t, littleSize, dstPath)
+					littleLFS = commitAndPush(t, littleSize, dstPath)
 				})
 				t.Run("Big", func(t *testing.T) {
-					commitAndPush(t, bigSize, dstPath)
+					bigLFS = commitAndPush(t, bigSize, dstPath)
 				})
 			})
 			t.Run("Locks", func(t *testing.T) {
 				lockTest(t, u.String(), dstPath)
 			})
 		})
+		t.Run("Raw", func(t *testing.T) {
+			session := loginUser(t, "user2")
+
+			// Request raw paths
+			req := NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/raw/branch/master/", little))
+			resp := session.MakeRequest(t, req, http.StatusOK)
+			assert.Equal(t, littleSize, resp.Body.Len())
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/raw/branch/master/", big))
+			nilResp := session.MakeRequestNilResponseRecorder(t, req, http.StatusOK)
+			assert.Equal(t, bigSize, nilResp.Length)
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/raw/branch/master/", littleLFS))
+			resp = session.MakeRequest(t, req, http.StatusOK)
+			assert.NotEqual(t, littleSize, resp.Body.Len())
+			assert.Contains(t, resp.Body.String(), models.LFSMetaFileIdentifier)
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/raw/branch/master/", bigLFS))
+			resp = session.MakeRequest(t, req, http.StatusOK)
+			assert.NotEqual(t, bigSize, resp.Body.Len())
+			assert.Contains(t, resp.Body.String(), models.LFSMetaFileIdentifier)
+
+		})
+		t.Run("Media", func(t *testing.T) {
+			session := loginUser(t, "user2")
+
+			// Request media paths
+			req := NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/media/branch/master/", little))
+			resp := session.MakeRequestNilResponseRecorder(t, req, http.StatusOK)
+			assert.Equal(t, littleSize, resp.Length)
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/media/branch/master/", big))
+			resp = session.MakeRequestNilResponseRecorder(t, req, http.StatusOK)
+			assert.Equal(t, bigSize, resp.Length)
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/media/branch/master/", littleLFS))
+			resp = session.MakeRequestNilResponseRecorder(t, req, http.StatusOK)
+			assert.Equal(t, littleSize, resp.Length)
+
+			req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-17/media/branch/master/", bigLFS))
+			resp = session.MakeRequestNilResponseRecorder(t, req, http.StatusOK)
+			assert.Equal(t, bigSize, resp.Length)
+		})
+
 	})
 	t.Run("SSH", func(t *testing.T) {
 		sshContext := baseAPITestContext
@@ -97,6 +146,7 @@ func testGit(t *testing.T, u *url.URL) {
 			dstPath, err := ioutil.TempDir("", sshContext.Reponame)
 			assert.NoError(t, err)
 			defer os.RemoveAll(dstPath)
+			var little, big, littleLFS, bigLFS string
 
 			t.Run("Standard", func(t *testing.T) {
 				t.Run("CreateRepo", doAPICreateRepository(sshContext, false))
@@ -107,10 +157,10 @@ func testGit(t *testing.T, u *url.URL) {
 				//time.Sleep(5 * time.Minute)
 				t.Run("PushCommit", func(t *testing.T) {
 					t.Run("Little", func(t *testing.T) {
-						commitAndPush(t, littleSize, dstPath)
+						little = commitAndPush(t, littleSize, dstPath)
 					})
 					t.Run("Big", func(t *testing.T) {
-						commitAndPush(t, bigSize, dstPath)
+						big = commitAndPush(t, bigSize, dstPath)
 					})
 				})
 			})
@@ -125,16 +175,59 @@ func testGit(t *testing.T, u *url.URL) {
 					assert.NoError(t, err)
 
 					t.Run("Little", func(t *testing.T) {
-						commitAndPush(t, littleSize, dstPath)
+						littleLFS = commitAndPush(t, littleSize, dstPath)
 					})
 					t.Run("Big", func(t *testing.T) {
-						commitAndPush(t, bigSize, dstPath)
+						bigLFS = commitAndPush(t, bigSize, dstPath)
 					})
 				})
 				t.Run("Locks", func(t *testing.T) {
 					lockTest(t, u.String(), dstPath)
 				})
 			})
+			t.Run("Raw", func(t *testing.T) {
+				session := loginUser(t, "user2")
+
+				// Request raw paths
+				req := NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/raw/branch/master/", little))
+				resp := session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, littleSize, resp.Body.Len())
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/raw/branch/master/", big))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, bigSize, resp.Body.Len())
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/raw/branch/master/", littleLFS))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.NotEqual(t, littleSize, resp.Body.Len())
+				assert.Contains(t, resp.Body.String(), models.LFSMetaFileIdentifier)
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/raw/branch/master/", bigLFS))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.NotEqual(t, bigSize, resp.Body.Len())
+				assert.Contains(t, resp.Body.String(), models.LFSMetaFileIdentifier)
+
+			})
+			t.Run("Media", func(t *testing.T) {
+				session := loginUser(t, "user2")
+
+				// Request media paths
+				req := NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/media/branch/master/", little))
+				resp := session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, littleSize, resp.Body.Len())
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/media/branch/master/", big))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, bigSize, resp.Body.Len())
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/media/branch/master/", littleLFS))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, littleSize, resp.Body.Len())
+
+				req = NewRequest(t, "GET", path.Join("/user2/repo-tmp-18/media/branch/master/", bigLFS))
+				resp = session.MakeRequest(t, req, http.StatusOK)
+				assert.Equal(t, bigSize, resp.Body.Len())
+			})
 
 		})
 
@@ -162,34 +255,35 @@ func lockTest(t *testing.T, remote, repoPath string) {
 	assert.NoError(t, err)
 }
 
-func commitAndPush(t *testing.T, size int, repoPath string) {
-	err := generateCommitWithNewData(size, repoPath, "user2@example.com", "User Two")
+func commitAndPush(t *testing.T, size int, repoPath string) string {
+	name, err := generateCommitWithNewData(size, repoPath, "user2@example.com", "User Two")
 	assert.NoError(t, err)
 	_, err = git.NewCommand("push").RunInDir(repoPath) //Push
 	assert.NoError(t, err)
+	return name
 }
 
-func generateCommitWithNewData(size int, repoPath, email, fullName string) error {
+func generateCommitWithNewData(size int, repoPath, email, fullName string) (string, error) {
 	//Generate random file
 	data := make([]byte, size)
 	_, err := rand.Read(data)
 	if err != nil {
-		return err
+		return "", err
 	}
 	tmpFile, err := ioutil.TempFile(repoPath, "data-file-")
 	if err != nil {
-		return err
+		return "", err
 	}
 	defer tmpFile.Close()
 	_, err = tmpFile.Write(data)
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	//Commit
 	err = git.AddChanges(repoPath, false, filepath.Base(tmpFile.Name()))
 	if err != nil {
-		return err
+		return "", err
 	}
 	err = git.CommitChanges(repoPath, git.CommitChangesOptions{
 		Committer: &git.Signature{
@@ -204,5 +298,5 @@ func generateCommitWithNewData(size int, repoPath, email, fullName string) error
 		},
 		Message: fmt.Sprintf("Testing commit @ %v", time.Now()),
 	})
-	return err
+	return filepath.Base(tmpFile.Name()), err
 }

integrations/integration_test.go

@@ -35,6 +35,23 @@ import (
 
 var mac *macaron.Macaron
 
+type NilResponseRecorder struct {
+	httptest.ResponseRecorder
+	Length int
+}
+
+func (n *NilResponseRecorder) Write(b []byte) (int, error) {
+	n.Length = n.Length + len(b)
+	return len(b), nil
+}
+
+// NewRecorder returns an initialized ResponseRecorder.
+func NewNilResponseRecorder() *NilResponseRecorder {
+	return &NilResponseRecorder{
+		ResponseRecorder: *httptest.NewRecorder(),
+	}
+}
+
 func TestMain(m *testing.M) {
 	initIntegrationTest()
 	mac = routes.NewMacaron()
@@ -192,6 +209,22 @@ func (s *TestSession) MakeRequest(t testing.TB, req *http.Request, expectedStatu
 	return resp
 }
 
+func (s *TestSession) MakeRequestNilResponseRecorder(t testing.TB, req *http.Request, expectedStatus int) *NilResponseRecorder {
+	baseURL, err := url.Parse(setting.AppURL)
+	assert.NoError(t, err)
+	for _, c := range s.jar.Cookies(baseURL) {
+		req.AddCookie(c)
+	}
+	resp := MakeRequestNilResponseRecorder(t, req, expectedStatus)
+
+	ch := http.Header{}
+	ch.Add("Cookie", strings.Join(resp.HeaderMap["Set-Cookie"], ";"))
+	cr := http.Request{Header: ch}
+	s.jar.SetCookies(baseURL, cr.Cookies())
+
+	return resp
+}
+
 const userPassword = "password"
 
 var loginSessionCache = make(map[string]*TestSession, 10)
@@ -305,6 +338,18 @@ func MakeRequest(t testing.TB, req *http.Request, expectedStatus int) *httptest.
 	return recorder
 }
 
+func MakeRequestNilResponseRecorder(t testing.TB, req *http.Request, expectedStatus int) *NilResponseRecorder {
+	recorder := NewNilResponseRecorder()
+	mac.ServeHTTP(recorder, req)
+	if expectedStatus != NoExpectedStatus {
+		if !assert.EqualValues(t, expectedStatus, recorder.Code,
+			"Request: %s %s", req.Method, req.URL.String()) {
+			logUnexpectedResponse(t, &recorder.ResponseRecorder)
+		}
+	}
+	return recorder
+}
+
 // logUnexpectedResponse logs the contents of an unexpected response.
 func logUnexpectedResponse(t testing.TB, recorder *httptest.ResponseRecorder) {
 	respBytes := recorder.Body.Bytes()

modules/lfs/pointers.go

@@ -0,0 +1,69 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package lfs
+
+import (
+	"io"
+	"strconv"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// ReadPointerFile will return a partially filled LFSMetaObject if the provided reader is a pointer file
+func ReadPointerFile(reader io.Reader) (*models.LFSMetaObject, *[]byte) {
+	if !setting.LFS.StartServer {
+		return nil, nil
+	}
+
+	buf := make([]byte, 1024)
+	n, _ := reader.Read(buf)
+	buf = buf[:n]
+
+	if isTextFile := base.IsTextFile(buf); !isTextFile {
+		return nil, nil
+	}
+
+	return IsPointerFile(&buf), &buf
+}
+
+// IsPointerFile will return a partially filled LFSMetaObject if the provided byte slice is a pointer file
+func IsPointerFile(buf *[]byte) *models.LFSMetaObject {
+	if !setting.LFS.StartServer {
+		return nil
+	}
+
+	headString := string(*buf)
+	if !strings.HasPrefix(headString, models.LFSMetaFileIdentifier) {
+		return nil
+	}
+
+	splitLines := strings.Split(headString, "\n")
+	if len(splitLines) < 3 {
+		return nil
+	}
+
+	oid := strings.TrimPrefix(splitLines[1], models.LFSMetaFileOidPrefix)
+	size, err := strconv.ParseInt(strings.TrimPrefix(splitLines[2], "size "), 10, 64)
+	if len(oid) != 64 || err != nil {
+		return nil
+	}
+
+	contentStore := &ContentStore{BasePath: setting.LFS.ContentPath}
+	meta := &models.LFSMetaObject{Oid: oid, Size: size}
+	if !contentStore.Exists(meta) {
+		return nil
+	}
+
+	return meta
+}
+
+// ReadMetaObject will read a models.LFSMetaObject and return a reader
+func ReadMetaObject(meta *models.LFSMetaObject) (io.ReadCloser, error) {
+	contentStore := &ContentStore{BasePath: setting.LFS.ContentPath}
+	return contentStore.Get(meta, 0)
+}

modules/markup/markdown/markdown.go

@@ -106,7 +106,7 @@ func (r *Renderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byt
 	if r.IsWiki {
 		prefix = util.URLJoin(prefix, "wiki", "raw")
 	}
-	prefix = strings.Replace(prefix, "/src/", "/raw/", 1)
+	prefix = strings.Replace(prefix, "/src/", "/media/", 1)
 	if len(link) > 0 && !markup.IsLink(link) {
 		lnk := string(link)
 		lnk = util.URLJoin(prefix, lnk)

options/locale/locale_en-US.ini

@@ -612,6 +612,7 @@ editor.new_file = New File
 editor.upload_file = Upload File
 editor.edit_file = Edit File
 editor.preview_changes = Preview Changes
+editor.cannot_edit_lfs_files = LFS files cannot be edited in the web interface.
 editor.cannot_edit_non_text_files = Binary files cannot be edited in the web interface.
 editor.edit_this_file = Edit File
 editor.must_be_on_a_branch = You must be on a branch to make or propose changes to this file.

routers/repo/download.go

@@ -15,6 +15,7 @@ import (
 
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/lfs"
 )
 
 // ServeData download file from io.Reader
@@ -55,6 +56,29 @@ func ServeBlob(ctx *context.Context, blob *git.Blob) error {
 	return ServeData(ctx, ctx.Repo.TreePath, dataRc)
 }
 
+// ServeBlobOrLFS download a git.Blob redirecting to LFS if necessary
+func ServeBlobOrLFS(ctx *context.Context, blob *git.Blob) error {
+	dataRc, err := blob.DataAsync()
+	if err != nil {
+		return err
+	}
+	defer dataRc.Close()
+
+	if meta, _ := lfs.ReadPointerFile(dataRc); meta != nil {
+		meta, _ = ctx.Repo.Repository.GetLFSMetaObjectByOid(meta.Oid)
+		if meta == nil {
+			return ServeBlob(ctx, blob)
+		}
+		lfsDataRc, err := lfs.ReadMetaObject(meta)
+		if err != nil {
+			return err
+		}
+		return ServeData(ctx, ctx.Repo.TreePath, lfsDataRc)
+	}
+
+	return ServeBlob(ctx, blob)
+}
+
 // SingleDownload download a file by repos path
 func SingleDownload(ctx *context.Context) {
 	blob, err := ctx.Repo.Commit.GetBlobByPath(ctx.Repo.TreePath)
@@ -71,6 +95,22 @@ func SingleDownload(ctx *context.Context) {
 	}
 }
 
+// SingleDownloadOrLFS download a file by repos path redirecting to LFS if necessary
+func SingleDownloadOrLFS(ctx *context.Context) {
+	blob, err := ctx.Repo.Commit.GetBlobByPath(ctx.Repo.TreePath)
+	if err != nil {
+		if git.IsErrNotExist(err) {
+			ctx.NotFound("GetBlobByPath", nil)
+		} else {
+			ctx.ServerError("GetBlobByPath", err)
+		}
+		return
+	}
+	if err = ServeBlobOrLFS(ctx, blob); err != nil {
+		ctx.ServerError("ServeBlobOrLFS", err)
+	}
+}
+
 // DownloadByID download a file by sha1 ID
 func DownloadByID(ctx *context.Context) {
 	blob, err := ctx.Repo.GitRepo.GetBlob(ctx.Params("sha"))
@@ -86,3 +126,19 @@ func DownloadByID(ctx *context.Context) {
 		ctx.ServerError("ServeBlob", err)
 	}
 }
+
+// DownloadByIDOrLFS download a file by sha1 ID taking account of LFS
+func DownloadByIDOrLFS(ctx *context.Context) {
+	blob, err := ctx.Repo.GitRepo.GetBlob(ctx.Params("sha"))
+	if err != nil {
+		if git.IsErrNotExist(err) {
+			ctx.NotFound("GetBlob", nil)
+		} else {
+			ctx.ServerError("GetBlob", err)
+		}
+		return
+	}
+	if err = ServeBlobOrLFS(ctx, blob); err != nil {
+		ctx.ServerError("ServeBlob", err)
+	}
+}

routers/repo/view.go

@@ -12,7 +12,6 @@ import (
 	gotemplate "html/template"
 	"io/ioutil"
 	"path"
-	"strconv"
 	"strings"
 
 	"code.gitea.io/git"
@@ -179,34 +178,42 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	buf = buf[:n]
 
 	isTextFile := base.IsTextFile(buf)
+	isLFSFile := false
 	ctx.Data["IsTextFile"] = isTextFile
 
 	//Check for LFS meta file
-	if isTextFile && setting.LFS.StartServer {
-		headString := string(buf)
-		if strings.HasPrefix(headString, models.LFSMetaFileIdentifier) {
-			splitLines := strings.Split(headString, "\n")
-			if len(splitLines) >= 3 {
-				oid := strings.TrimPrefix(splitLines[1], models.LFSMetaFileOidPrefix)
-				size, err := strconv.ParseInt(strings.TrimPrefix(splitLines[2], "size "), 10, 64)
-				if len(oid) == 64 && err == nil {
-					contentStore := &lfs.ContentStore{BasePath: setting.LFS.ContentPath}
-					meta := &models.LFSMetaObject{Oid: oid}
-					if contentStore.Exists(meta) {
-						ctx.Data["IsTextFile"] = false
-						isTextFile = false
-						ctx.Data["IsLFSFile"] = true
-						ctx.Data["FileSize"] = size
-						filenameBase64 := base64.RawURLEncoding.EncodeToString([]byte(blob.Name()))
-						ctx.Data["RawFileLink"] = fmt.Sprintf("%s%s.git/info/lfs/objects/%s/%s", setting.AppURL, ctx.Repo.Repository.FullName(), oid, filenameBase64)
-					}
+	if isTextFile {
+		if meta := lfs.IsPointerFile(&buf); meta != nil {
+			if meta, _ = ctx.Repo.Repository.GetLFSMetaObjectByOid(meta.Oid); meta != nil {
+				ctx.Data["IsLFSFile"] = true
+				isLFSFile = true
+
+				// OK read the lfs object
+				dataRc, err := lfs.ReadMetaObject(meta)
+				if err != nil {
+					ctx.ServerError("ReadMetaObject", err)
+					return
 				}
+				defer dataRc.Close()
+
+				buf = make([]byte, 1024)
+				n, _ = dataRc.Read(buf)
+				buf = buf[:n]
+
+				isTextFile = base.IsTextFile(buf)
+				ctx.Data["IsTextFile"] = isTextFile
+
+				ctx.Data["FileSize"] = meta.Size
+				filenameBase64 := base64.RawURLEncoding.EncodeToString([]byte(blob.Name()))
+				ctx.Data["RawFileLink"] = fmt.Sprintf("%s%s.git/info/lfs/objects/%s/%s", setting.AppURL, ctx.Repo.Repository.FullName(), meta.Oid, filenameBase64)
 			}
 		}
 	}
 
 	// Assume file is not editable first.
-	if !isTextFile {
+	if isLFSFile {
+		ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_lfs_files")
+	} else if !isTextFile {
 		ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_non_text_files")
 	}
 
@@ -263,14 +270,15 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 			}
 			ctx.Data["LineNums"] = gotemplate.HTML(output.String())
 		}
-
-		if ctx.Repo.CanEnableEditor() {
-			ctx.Data["CanEditFile"] = true
-			ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.edit_this_file")
-		} else if !ctx.Repo.IsViewBranch {
-			ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.must_be_on_a_branch")
-		} else if !ctx.Repo.CanWrite(models.UnitTypeCode) {
-			ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.fork_before_edit")
+		if !isLFSFile {
+			if ctx.Repo.CanEnableEditor() {
+				ctx.Data["CanEditFile"] = true
+				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.edit_this_file")
+			} else if !ctx.Repo.IsViewBranch {
+				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.must_be_on_a_branch")
+			} else if !ctx.Repo.CanWrite(models.UnitTypeCode) {
+				ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.fork_before_edit")
+			}
 		}
 
 	case base.IsPDFFile(buf):

routers/routes/routes.go

@@ -731,6 +731,15 @@ func RegisterRoutes(m *macaron.Macaron) {
 			})
 		}, repo.MustAllowPulls)
 
+		m.Group("/media", func() {
+			m.Get("/branch/*", context.RepoRefByType(context.RepoRefBranch), repo.SingleDownloadOrLFS)
+			m.Get("/tag/*", context.RepoRefByType(context.RepoRefTag), repo.SingleDownloadOrLFS)
+			m.Get("/commit/*", context.RepoRefByType(context.RepoRefCommit), repo.SingleDownloadOrLFS)
+			m.Get("/blob/:sha", context.RepoRefByType(context.RepoRefBlob), repo.DownloadByIDOrLFS)
+			// "/*" route is deprecated, and kept for backward compatibility
+			m.Get("/*", context.RepoRefByType(context.RepoRefLegacy), repo.SingleDownloadOrLFS)
+		}, repo.MustBeNotEmpty, reqRepoCodeReader)
+
 		m.Group("/raw", func() {
 			m.Get("/branch/*", context.RepoRefByType(context.RepoRefBranch), repo.SingleDownload)
 			m.Get("/tag/*", context.RepoRefByType(context.RepoRefTag), repo.SingleDownload)