MVP: 按 07 风格重写前端 + Go 后端落地（长文/短文、编辑器、后台管理）

backend/internal/httpx/httpx.go

@@ -0,0 +1,60 @@
+// Package httpx holds the tiny JSON helpers shared by the public and admin APIs.
+package httpx
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"strconv"
+)
+
+type ErrorResponse struct {
+	Error string `json:"error"`
+}
+
+func WriteJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+func OK(w http.ResponseWriter, v any)      { WriteJSON(w, http.StatusOK, v) }
+func Created(w http.ResponseWriter, v any) { WriteJSON(w, http.StatusCreated, v) }
+
+func Error(w http.ResponseWriter, status int, msg string) {
+	WriteJSON(w, status, ErrorResponse{Error: msg})
+}
+
+func BadRequest(w http.ResponseWriter, msg string) { Error(w, http.StatusBadRequest, msg) }
+func NotFound(w http.ResponseWriter)               { Error(w, http.StatusNotFound, "not found") }
+func Unauthorized(w http.ResponseWriter)           { Error(w, http.StatusUnauthorized, "unauthorized") }
+func ServerError(w http.ResponseWriter, err error) {
+	Error(w, http.StatusInternalServerError, err.Error())
+}
+
+func Decode(r *http.Request, dst any) error {
+	body, err := io.ReadAll(io.LimitReader(r.Body, 8<<20))
+	if err != nil {
+		return err
+	}
+	if len(body) == 0 {
+		return io.EOF
+	}
+	return json.Unmarshal(body, dst)
+}
+
+func QueryInt(r *http.Request, key string, def int) int {
+	s := r.URL.Query().Get(key)
+	if s == "" {
+		return def
+	}
+	n, err := strconv.Atoi(s)
+	if err != nil || n < 0 {
+		return def
+	}
+	return n
+}
+
+func QueryString(r *http.Request, key string) string {
+	return r.URL.Query().Get(key)
+}