add upload permission

miniprogram/utils/Permission.ts

@@ -0,0 +1,61 @@
+import { JournalApi } from "../api/JournalApi";
+
+const UPLOAD_PERMISSION_KEY = "journal:can-upload";
+let cachedCanUpload: boolean | null = null;
+let pendingCheck: Promise<boolean> | null = null;
+
+function parseCachedValue(value: unknown): boolean | null {
+	if (value === true || value === false) {
+		return value;
+	}
+	if (value === "true") {
+		return true;
+	}
+	if (value === "false") {
+		return false;
+	}
+	return null;
+}
+
+export default class Permission {
+	/** 获取缓存的上传权限（不存在则返回 null） */
+	static getCachedUploadPermission(): boolean | null {
+		if (cachedCanUpload !== null) {
+			return cachedCanUpload;
+		}
+		try {
+			const value = wx.getStorageSync(UPLOAD_PERMISSION_KEY);
+			const parsed = parseCachedValue(value);
+			if (parsed !== null) {
+				cachedCanUpload = parsed;
+				return parsed;
+			}
+		} catch (error) {
+			console.warn("读取上传权限缓存失败", error);
+		}
+		return null;
+	}
+
+	/** 检查并缓存上传权限 */
+	static async checkAndCacheUploadPermission(): Promise<boolean> {
+		if (pendingCheck) {
+			return await pendingCheck;
+		}
+		pendingCheck = (async () => {
+			try {
+				const canUpload = await JournalApi.canUpload();
+				cachedCanUpload = !!canUpload;
+				wx.setStorageSync(UPLOAD_PERMISSION_KEY, cachedCanUpload);
+				return cachedCanUpload;
+			} catch (error) {
+				console.error("检查上传权限失败", error);
+				const cached = this.getCachedUploadPermission();
+				const fallback = cached !== null ? cached : false;
+				return fallback;
+			} finally {
+				pendingCheck = null;
+			}
+		})();
+		return await pendingCheck;
+	}
+}