feat: initialize independent Sense product skeleton (#21)

Sense/server/internal/platform/http.go

@@ -0,0 +1,39 @@
+package platform
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+)
+
+type APIError struct {
+	Status  int
+	Code    string
+	Message string
+}
+
+func (e *APIError) Error() string { return e.Message }
+
+func WriteJSON(w http.ResponseWriter, status int, value any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(value)
+}
+
+func WriteError(w http.ResponseWriter, err error) {
+	var apiErr *APIError
+	if errors.As(err, &apiErr) {
+		WriteJSON(w, apiErr.Status, map[string]any{"error": map[string]string{"code": apiErr.Code, "message": apiErr.Message}})
+		return
+	}
+	WriteJSON(w, http.StatusInternalServerError, map[string]any{"error": map[string]string{"code": "internal_error", "message": "服务暂时不可用"}})
+}
+
+func DecodeJSON(r *http.Request, target any) error {
+	decoder := json.NewDecoder(http.MaxBytesReader(nil, r.Body, 1<<20))
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(target); err != nil {
+		return &APIError{Status: http.StatusBadRequest, Code: "invalid_request", Message: "请求内容格式不正确"}
+	}
+	return nil
+}