Allow display of LFS stored Readme.md on directory page (#6073) (#6099)

* Fix display of >1Kb LFS text files

* Make LFS stored Readme files viewable

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Slight restructure

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Slight restructure

Signed-off-by: Andrew Thornton <art27@cantab.net>

* catch errors and restructure LFS sections

routers/repo/view.go

@@ -103,13 +103,62 @@ func renderDirectory(ctx *context.Context, treeLink string) {
 		isTextFile := base.IsTextFile(buf)
 		ctx.Data["FileIsText"] = isTextFile
 		ctx.Data["FileName"] = readmeFile.Name()
+		fileSize := int64(0)
+		isLFSFile := false
+		ctx.Data["IsLFSFile"] = false
+
 		// FIXME: what happens when README file is an image?
+		if isTextFile && setting.LFS.StartServer {
+			meta := lfs.IsPointerFile(&buf)
+			if meta != nil {
+				meta, err = ctx.Repo.Repository.GetLFSMetaObjectByOid(meta.Oid)
+				if err != nil && err != models.ErrLFSObjectNotExist {
+					ctx.ServerError("GetLFSMetaObject", err)
+					return
+				}
+			}
+
+			if meta != nil {
+				ctx.Data["IsLFSFile"] = true
+				isLFSFile = true
+
+				// OK read the lfs object
+				var err error
+				dataRc, err = lfs.ReadMetaObject(meta)
+				if err != nil {
+					ctx.ServerError("ReadMetaObject", err)
+					return
+				}
+				defer dataRc.Close()
+
+				buf = make([]byte, 1024)
+				n, err = dataRc.Read(buf)
+				if err != nil {
+					ctx.ServerError("Data", err)
+					return
+				}
+				buf = buf[:n]
+
+				isTextFile = base.IsTextFile(buf)
+				ctx.Data["IsTextFile"] = isTextFile
+
+				fileSize = meta.Size
+				ctx.Data["FileSize"] = meta.Size
+				filenameBase64 := base64.RawURLEncoding.EncodeToString([]byte(readmeFile.Name()))
+				ctx.Data["RawFileLink"] = fmt.Sprintf("%s%s.git/info/lfs/objects/%s/%s", setting.AppURL, ctx.Repo.Repository.FullName(), meta.Oid, filenameBase64)
+			}
+		}
+
+		if !isLFSFile {
+			fileSize = readmeFile.Size()
+		}
+
 		if isTextFile {
-			if readmeFile.Size() >= setting.UI.MaxDisplayFileSize {
+			if fileSize >= setting.UI.MaxDisplayFileSize {
 				// Pretend that this is a normal text file to display 'This file is too large to be shown'
 				ctx.Data["IsFileTooLarge"] = true
 				ctx.Data["IsTextFile"] = true
-				ctx.Data["FileSize"] = readmeFile.Size()
+				ctx.Data["FileSize"] = fileSize
 			} else {
 				d, _ := ioutil.ReadAll(dataRc)
 				buf = templates.ToUTF8WithFallback(append(buf, d...))
@@ -168,7 +217,8 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 
 	ctx.Data["Title"] = ctx.Data["Title"].(string) + " - " + ctx.Repo.TreePath + " at " + ctx.Repo.BranchName
 
-	ctx.Data["FileSize"] = blob.Size()
+	fileSize := blob.Size()
+	ctx.Data["FileSize"] = fileSize
 	ctx.Data["FileName"] = blob.Name()
 	ctx.Data["HighlightClass"] = highlight.FileNameToHighlightClass(blob.Name())
 	ctx.Data["RawFileLink"] = rawLink + "/" + ctx.Repo.TreePath
@@ -182,31 +232,43 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	ctx.Data["IsTextFile"] = isTextFile
 
 	//Check for LFS meta file
-	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()
+	if isTextFile && setting.LFS.StartServer {
+		meta := lfs.IsPointerFile(&buf)
+		if meta != nil {
+			meta, err = ctx.Repo.Repository.GetLFSMetaObjectByOid(meta.Oid)
+			if err != nil && err != models.ErrLFSObjectNotExist {
+				ctx.ServerError("GetLFSMetaObject", err)
+				return
+			}
+		}
+		if meta != nil {
+			ctx.Data["IsLFSFile"] = true
+			isLFSFile = true
+
+			// OK read the lfs object
+			var err error
+			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]
+			buf = make([]byte, 1024)
+			n, err = dataRc.Read(buf)
+			if err != nil {
+				ctx.ServerError("Data", err)
+				return
+			}
+			buf = buf[:n]
 
-				isTextFile = base.IsTextFile(buf)
-				ctx.Data["IsTextFile"] = isTextFile
+			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)
-			}
+			fileSize = meta.Size
+			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)
 		}
 	}
 
@@ -219,7 +281,7 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 
 	switch {
 	case isTextFile:
-		if blob.Size() >= setting.UI.MaxDisplayFileSize {
+		if fileSize >= setting.UI.MaxDisplayFileSize {
 			ctx.Data["IsFileTooLarge"] = true
 			break
 		}