Reorganize the webUI and API code

Included in the changes:
- create a new /api root package to hold all API code, migrate /graphql in there
- git API handlers all use the cache instead of the repo directly
- git API handlers are now tested
- git API handlers now require a "repo" mux parameter
- lots of untangling of API/handlers/middleware
- less code in commands/webui.go

1 files changed, 61 insertions, 0 deletions

diff --git a/api/http/git_file_handler.go b/api/http/git_file_handler.go
new file mode 100644
index 00000000..6bd6fa85
--- /dev/null
+++ b/api/http/git_file_handler.go
@@ -0,0 +1,61 @@
+package http
+
+import (
+	"bytes"
+	"net/http"
+	"time"
+
+	"github.com/gorilla/mux"
+
+	"github.com/MichaelMure/git-bug/cache"
+	"github.com/MichaelMure/git-bug/util/git"
+)
+
+// implement a http.Handler that will read and server git blob.
+//
+// Expected gorilla/mux parameters:
+//   - "repo" : the ref of the repo or "" for the default one
+//   - "hash" : the git hash of the file to retrieve
+type gitFileHandler struct {
+	mrc *cache.MultiRepoCache
+}
+
+func NewGitFileHandler(mrc *cache.MultiRepoCache) http.Handler {
+	return &gitFileHandler{mrc: mrc}
+}
+
+func (gfh *gitFileHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
+	var repo *cache.RepoCache
+	var err error
+
+	repoVar := mux.Vars(r)["repo"]
+	switch repoVar {
+	case "":
+		repo, err = gfh.mrc.DefaultRepo()
+	default:
+		repo, err = gfh.mrc.ResolveRepo(repoVar)
+	}
+
+	if err != nil {
+		http.Error(rw, "invalid repo reference", http.StatusBadRequest)
+		return
+	}
+
+	hash := git.Hash(mux.Vars(r)["hash"])
+	if !hash.IsValid() {
+		http.Error(rw, "invalid git hash", http.StatusBadRequest)
+		return
+	}
+
+	// TODO: this mean that the whole file will he buffered in memory
+	// This can be a problem for big files. There might be a way around
+	// that by implementing a io.ReadSeeker that would read and discard
+	// data when a seek is called.
+	data, err := repo.ReadData(hash)
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.ServeContent(rw, r, "", time.Now(), bytes.NewReader(data))
+}