(refs #1101)Support LFS files in the blob view

src/main/scala/gitbucket/core/controller/RepositoryViewerController.scala

@@ -1,6 +1,7 @@
 package gitbucket.core.controller
 
-import javax.servlet.http.{HttpServletResponse, HttpServletRequest}
+import java.io.FileInputStream
+import javax.servlet.http.{HttpServletRequest, HttpServletResponse}
 
 import gitbucket.core.plugin.PluginRegistry
 import gitbucket.core.repo.html
@@ -16,9 +17,8 @@ import gitbucket.core.model.{Account, WebHook}
 import gitbucket.core.service.WebHookService._
 import gitbucket.core.view
 import gitbucket.core.view.helpers
-
 import io.github.gitbucket.scalatra.forms._
-import org.apache.commons.io.FileUtils
+import org.apache.commons.io.{FileUtils, IOUtils}
 import org.eclipse.jgit.api.{ArchiveCommand, Git}
 import org.eclipse.jgit.archive.{TgzFormat, ZipFormat}
 import org.eclipse.jgit.dircache.DirCache
@@ -255,13 +255,9 @@ trait RepositoryViewerControllerBase extends ControllerBase {
     val (id, path) = repository.splitPath(multiParams("splat").head)
     using(Git.open(getRepositoryDir(repository.owner, repository.name))){ git =>
       val revCommit = JGitUtil.getRevCommitFromId(git, git.getRepository.resolve(id))
-      getPathObjectId(git, path, revCommit).flatMap { objectId =>
-        JGitUtil.getObjectLoaderFromId(git, objectId){ loader =>
-          contentType = FileUtil.getMimeType(path)
-          response.setContentLength(loader.getSize.toInt)
-          loader.copyTo(response.outputStream)
-          ()
-        }
+
+      getPathObjectId(git, path, revCommit).map { objectId =>
+        responseRawFile(git, objectId, path)
       } getOrElse NotFound()
     }
   })
@@ -277,23 +273,61 @@ trait RepositoryViewerControllerBase extends ControllerBase {
       getPathObjectId(git, path, revCommit).map { objectId =>
         if(raw){
           // Download (This route is left for backword compatibility)
-          JGitUtil.getObjectLoaderFromId(git, objectId){ loader =>
-            contentType = FileUtil.getMimeType(path)
-            response.setContentLength(loader.getSize.toInt)
-            loader.copyTo(response.outputStream)
-            ()
-          } getOrElse NotFound()
+          responseRawFile(git, objectId, path)
         } else {
           html.blob(id, repository, path.split("/").toList,
             JGitUtil.getContentInfo(git, path, objectId),
             new JGitUtil.CommitInfo(JGitUtil.getLastModifiedCommit(git, revCommit, path)),
             hasDeveloperRole(repository.owner, repository.name, context.loginAccount),
-            request.paths(2) == "blame")
+            request.paths(2) == "blame",
+            isLfsFile(git, objectId))
         }
       } getOrElse NotFound()
     }
   })
 
+  private def isLfsFile(git: Git, objectId: ObjectId): Boolean = {
+    JGitUtil.getObjectLoaderFromId(git, objectId){ loader =>
+      if(loader.isLarge){
+        false
+      } else {
+        new String(loader.getCachedBytes, "UTF-8").startsWith("version https://git-lfs.github.com/spec/v1")
+      }
+    }.getOrElse(false)
+  }
+
+  private def responseRawFile(git: Git, objectId: ObjectId, path: String): Unit = {
+    JGitUtil.getObjectLoaderFromId(git, objectId){ loader =>
+      contentType = FileUtil.getMimeType(path)
+
+      if(loader.isLarge || context.settings.lfs.serverUrl.isEmpty){
+        response.setContentLength(loader.getSize.toInt)
+        loader.copyTo(response.outputStream)
+      } else {
+        val bytes = loader.getCachedBytes
+        val text = new String(bytes, "UTF-8")
+
+        if(text.startsWith("version https://git-lfs.github.com/spec/v1")){
+          // LFS objects
+          val attrs = text.split("\n").map { line =>
+            val dim = line.split(" ")
+            dim(0) -> dim(1)
+          }.toMap
+
+          response.setContentLength(attrs("size").toInt)
+          val hash = attrs("oid").split(":")(1)
+
+          using(new FileInputStream(Directory.LfsHome + "/" + hash.substring(0, 2) + "/" + hash.substring(2, 4) + "/" + hash)){ in =>
+            IOUtils.copy(in, response.getOutputStream)
+          }
+        } else {
+          response.setContentLength(loader.getSize.toInt)
+          response.getOutputStream.write(bytes)
+        }
+      }
+    }
+  }
+
   get("/:owner/:repository/blame/*"){
     blobRoute.action()
   }

src/main/scala/gitbucket/core/util/Directory.scala

@@ -36,6 +36,8 @@ object Directory {
 
   val TemporaryHome = s"${GitBucketHome}/tmp"
 
+  val LfsHome = s"${GitBucketHome}/lfs"
+
   /**
    * Substance directory of the repository.
    */

src/main/twirl/gitbucket/core/repo/blob.scala.html

@@ -4,7 +4,8 @@
   content: gitbucket.core.util.JGitUtil.ContentInfo,
   latestCommit: gitbucket.core.util.JGitUtil.CommitInfo,
   hasWritePermission: Boolean,
-  isBlame: Boolean)(implicit context: gitbucket.core.controller.Context)
+  isBlame: Boolean,
+  isLfsFile: Boolean)(implicit context: gitbucket.core.controller.Context)
 @import gitbucket.core.view.helpers
 @gitbucket.core.html.main(s"${(repository.name :: pathList).mkString("/")} at ${helpers.encodeRefName(branch)} - ${repository.owner}/${repository.name}", Some(repository)) {
   @gitbucket.core.html.menu("files", repository){
@@ -45,6 +46,9 @@
           <a href="@helpers.url(repository)/tree/@helpers.encodeRefName(branch)/@pathList.take(i + 1).mkString("/")">@section</a> /
         }
       }
+      @if(isLfsFile){
+        <span class="label label-info">LFS</span>
+      }
     </div>
     <div class="box-header">
       @helpers.avatar(latestCommit, 28)