move upstream into own package

server/upstream/helper.go

@@ -0,0 +1,53 @@
+package upstream
+
+import (
+	"time"
+
+	"github.com/valyala/fasthttp"
+	"github.com/valyala/fastjson"
+)
+
+type branchTimestamp struct {
+	Branch    string
+	Timestamp time.Time
+}
+
+// GetBranchTimestamp finds the default branch (if branch is "") and returns the last modification time of the branch
+// (or nil if the branch doesn't exist)
+func GetBranchTimestamp(owner, repo, branch, giteaRoot, giteaApiToken string) *branchTimestamp {
+	if result, ok := branchTimestampCache.Get(owner + "/" + repo + "/" + branch); ok {
+		if result == nil {
+			return nil
+		}
+		return result.(*branchTimestamp)
+	}
+	result := &branchTimestamp{}
+	result.Branch = branch
+	if branch == "" {
+		// Get default branch
+		var body = make([]byte, 0)
+		// TODO: use header for API key?
+		status, body, err := fasthttp.GetTimeout(body, giteaRoot+"/api/v1/repos/"+owner+"/"+repo+"?access_token="+giteaApiToken, 5*time.Second)
+		if err != nil || status != 200 {
+			_ = branchTimestampCache.Set(owner+"/"+repo+"/"+branch, nil, DefaultBranchCacheTimeout)
+			return nil
+		}
+		result.Branch = fastjson.GetString(body, "default_branch")
+	}
+
+	var body = make([]byte, 0)
+	status, body, err := fasthttp.GetTimeout(body, giteaRoot+"/api/v1/repos/"+owner+"/"+repo+"/branches/"+branch+"?access_token="+giteaApiToken, 5*time.Second)
+	if err != nil || status != 200 {
+		return nil
+	}
+
+	result.Timestamp, _ = time.Parse(time.RFC3339, fastjson.GetString(body, "commit", "timestamp"))
+	_ = branchTimestampCache.Set(owner+"/"+repo+"/"+branch, result, BranchExistanceCacheTimeout)
+	return result
+}
+
+type fileResponse struct {
+	exists   bool
+	mimeType string
+	body     []byte
+}