Add support for custom repo resolvers

Author: Jesse Ezell

auth/auth.go

@@ -17,6 +17,8 @@ type AuthInfo struct {
 	// But could also be: "some_repo.git"
 	Repo string
 
+	Request *http.Request
+
 	// Are we pushing or fetching ?
 	Push  bool
 	Fetch bool
@@ -40,6 +42,7 @@ func Authenticator(authf func(AuthInfo) (bool, error)) func(http.Handler) http.H
 			info := AuthInfo{
 				Username: auth.Name,
 				Password: auth.Pass,
+				Request:  req,
 				Repo:     repoName(req.URL.Path),
 				Push:     isPush(req),
 				Fetch:    isFetch(req),

githttp.go

@@ -10,6 +10,14 @@ import (
 	"strings"
 )
 
+type ResolveInfo struct {
+	Path    string
+	Request *http.Request
+}
+
+// Resolve a URL path to a repo location
+type PathResolver func(info ResolveInfo) (string, error)
+
 type GitHttp struct {
 	// Root directory to serve repos from
 	ProjectRoot string
@@ -23,6 +31,8 @@ type GitHttp struct {
 
 	// Event handling functions
 	EventHandler func(ev Event)
+
+	PathResolver PathResolver
 }
 
 // Implement the http.Handler interface
@@ -216,7 +226,16 @@ func sendFile(content_type string, hr HandlerReq) error {
 	return nil
 }
 
-func (g *GitHttp) getGitDir(file_path string) (string, error) {
+func (g *GitHttp) getGitDir(file_path string, req *http.Request) (string, error) {
+
+	var err error
+	if g.PathResolver != nil {
+		file_path, err = g.PathResolver(ResolveInfo{Path: file_path, Request: req})
+		if err != nil {
+			return "", err
+		}
+	}
+
 	root := g.ProjectRoot
 
 	if root == "" {

routing.go

@@ -90,7 +90,7 @@ func (g *GitHttp) requestHandler(w http.ResponseWriter, r *http.Request) {
 	file := strings.Replace(r.URL.Path, repo+"/", "", 1)
 
 	// Resolve directory
-	dir, err := g.getGitDir(repo)
+	dir, err := g.getGitDir(repo, r)
 
 	// Repo not found on disk
 	if err != nil {