Git LFS support v2 (#122)

* Import github.com/git-lfs/lfs-test-server as lfs module base

Imported commit is 3968aac269a77b73924649b9412ae03f7ccd3198

Removed:

Dockerfile CONTRIBUTING.md mgmt* script/ vendor/ kvlogger.go
.dockerignore .gitignore README.md

* Remove config, add JWT support from github.com/mgit-at/lfs-test-server

Imported commit f0cdcc5a01599c5a955dc1bbf683bb4acecdba83

* Add LFS settings

* Add LFS meta object model

* Add LFS routes and initialization

* Import github.com/dgrijalva/jwt-go into vendor/

* Adapt LFS module: handlers, routing, meta store

* Move LFS routes to /user/repo/info/lfs/*

* Add request header checks to LFS BatchHandler / PostHandler

* Implement LFS basic authentication

* Rework JWT secret generation / load

* Implement LFS SSH token authentication with JWT

Specification: https://github.com/github/git-lfs/tree/master/docs/api

* Integrate LFS settings into install process

* Remove LFS objects when repository is deleted

Only removes objects from content store when deleted repo is the only
referencing repository

* Make LFS module stateless

Fixes bug where LFS would not work after installation without
restarting Gitea

* Change 500 'Internal Server Error' to 400 'Bad Request'

* Change sql query to xorm call

* Remove unneeded type from LFS module

* Change internal imports to code.gitea.io/gitea/

* Add Gitea authors copyright

* Change basic auth realm to "gitea-lfs"

* Add unique indexes to LFS model

* Use xorm count function in LFS check on repository delete

* Return io.ReadCloser from content store and close after usage

* Add LFS info to runWeb()

* Export LFS content store base path

* LFS file download from UI

* Work around git-lfs client issue with unauthenticated requests

Returning a dummy Authorization header for unauthenticated requests
lets git-lfs client skip asking for auth credentials
See: https://github.com/github/git-lfs/issues/1088

* Fix unauthenticated UI downloads from public repositories

* Authentication check order, Finish LFS file view logic

* Ignore LFS hooks if installed for current OS user

Fixes Gitea UI actions for repositories tracking LFS files.
Checks for minimum needed git version by parsing the semantic version
string.

* Hide LFS metafile diff from commit view, marking as binary

* Show LFS notice if file in commit view is tracked

* Add notbefore/nbf JWT claim

* Correct lint suggestions - comments for structs and functions

- Add comments to LFS model
- Function comment for GetRandomBytesAsBase64
- LFS server function comments and lint variable suggestion

* Move secret generation code out of conditional

Ensures no LFS code may run with an empty secret

* Do not hand out JWT tokens if LFS server support is disabled

routers/repo/view.go

@@ -17,11 +17,14 @@ import (
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/highlight"
+	"code.gitea.io/gitea/modules/lfs"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markdown"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/templates"
+	"encoding/base64"
 	"github.com/Unknwon/paginater"
+	"strconv"
 )
 
 const (
@@ -139,6 +142,30 @@ func renderFile(ctx *context.Context, entry *git.TreeEntry, treeLink, rawLink st
 	isTextFile := base.IsTextFile(buf)
 	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/info/lfs/objects/%s/%s", setting.AppURL, ctx.Repo.Repository.FullName(), oid, filenameBase64)
+					}
+				}
+			}
+		}
+	}
+
 	// Assume file is not editable first.
 	if !isTextFile {
 		ctx.Data["EditFileTooltip"] = ctx.Tr("repo.editor.cannot_edit_non_text_files")