Initial project snapshot

backend/internal/platform/httpx/json.go

@@ -0,0 +1,45 @@
+package httpx
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func WriteJSON(w http.ResponseWriter, status int, payload any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(payload)
+}
+
+func WriteError(w http.ResponseWriter, status int, message string) {
+	traceID := ensureTraceID(w)
+	WriteJSON(w, status, ErrorResponse{
+		Error: NewErrorMessage(status, message, nil, traceID),
+	})
+}
+
+func WriteErrorMessage(w http.ResponseWriter, status int, message any) {
+	traceID := ensureTraceID(w)
+	switch payload := message.(type) {
+	case string:
+		WriteJSON(w, status, ErrorResponse{
+			Error: NewErrorMessage(status, payload, nil, traceID),
+		})
+	case ErrorResponse:
+		payload.Error.TraceID = traceID
+		WriteJSON(w, status, payload)
+	case *ErrorResponse:
+		if payload == nil {
+			WriteJSON(w, status, ErrorResponse{
+				Error: NewErrorMessage(status, "", nil, traceID),
+			})
+			return
+		}
+		payload.Error.TraceID = traceID
+		WriteJSON(w, status, payload)
+	default:
+		WriteJSON(w, status, ErrorResponse{
+			Error: NewErrorMessage(status, "Request failed.", nil, traceID),
+		})
+	}
+}