优化 captcha服务，允许复用session

src/config.ts

@@ -23,6 +23,7 @@ const config = {
             useRedis: false,
             allowMaxTryCount: 5,
             allowMaxAngleDiff: 8,
+            allowReuseCount: 2,
             expriedTimeSec: 60,
         }
     },

src/lib/Service/CaptchaSession.ts

@@ -10,6 +10,7 @@ interface CaptchaSessionRedisDataJSON {
     rotateDeg: number;
     tryCount: number;
     isPassed: boolean;
+    allowReuseCount: number;
     expiredTimestamp?: number;
 }
 
@@ -26,6 +27,7 @@ class _CaptchaSession {
     private readonly logger = new Logger('Service', 'captchaSession');
     private readonly AllowMaxTryCount: number = config.service.captchaSession.allowMaxTryCount;
     private readonly AllowMaxAngleDiff: number = config.service.captchaSession.allowMaxAngleDiff;
+    private readonly AllowReuseCount: number = config.service.captchaSession.allowReuseCount;
     private readonly ExpriedTimeSec: number = config.service.captchaSession.expriedTimeSec;
     private readonly RedisCommonKey: string = 'Service:captchaSession:';
     private redisConnection?: Redis;
@@ -101,12 +103,14 @@ class _CaptchaSession {
      * 
      * @param session 验证会话标识符
      * @param rotateDeg 图片旋转角度
+     * @param reuseCount 可选，允许重复使用的次数
      * @returns true存储成功 false存储失败
      */
-    public async add(session: string, rotateDeg: number): Promise<boolean> {
+    public async add(session: string, rotateDeg: number, reuseCount?: number): Promise<boolean> {
         const result: CaptchaSessionRedisDataJSON = {
             rotateDeg: rotateDeg,
             tryCount: 0,
+            allowReuseCount: reuseCount || this.AllowReuseCount,
             isPassed: false,
         }
 
@@ -142,9 +146,19 @@ class _CaptchaSession {
         const result = await this.get(session);
         if (!result)
             return false;
-        if (result.isPassed)
+        if (!result.isPassed)
+            return false;
+
+        // 验证通过，允许重复使用次数-1
+        result.allowReuseCount--;
+        if(result.allowReuseCount == 0)
             this.remove(session);
-        return result.isPassed;
+        else if(this.useRedis){
+            await this.redisConnection!.del(this.RedisCommonKey + session);
+            await this.redisConnection!.set(this.RedisCommonKey + session, JSON.stringify(result));
+            this.redisConnection!.expire(this.RedisCommonKey + session, this.ExpriedTimeSec);
+        }
+        return true;
     }
 
     /**