abstraction

api/message.go

@@ -0,0 +1,68 @@
+package api
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/render"
+)
+
+func MessageCtx(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		var message *Message
+		var err error
+
+		if messageID := chi.URLParam(r, "messageID"); messageID != "" {
+			message, err = dbGetMessage(messageID)
+		} else {
+			render.Render(w, r, ErrNotFound)
+			return
+		}
+		if err != nil {
+			render.Render(w, r, ErrNotFound)
+			return
+		}
+
+		ctx := context.WithValue(r.Context(), messageKey{}, message)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+func GetMessage(w http.ResponseWriter, r *http.Request) {
+	message, ok := r.Context().Value(messageKey{}).(*Message)
+	if !ok || message == nil {
+		render.Render(w, r, ErrNotFound)
+		return
+	}
+
+	if err := render.Render(w, r, NewMessageResponse(message)); err != nil {
+		render.Render(w, r, ErrRender(err))
+		return
+	}
+
+}
+
+type messageKey struct{}
+
+type Message struct {
+	ID        string `json:"id"`
+	UserID    int64  `json:"user_id"`
+	Body      string `json:"body"`
+	Timestamp int64  `json:"timestamp"`
+}
+
+type MessageRequest struct {
+	*Message
+
+	User *UserPayload `json:"user"`
+
+	ProtectedID string `json:"id"`
+}
+
+type MessageResponse struct {
+	*Message
+
+	User *UserPayload `json:"user,omitempty"`
+
+	Elapsed int64 `json:"elapsed"`
+}