當用戶在使用應用內購買功能的時候,若是用戶支付成功了,因爲網絡或者其它不可預計的因素,致使APP應用沒有將相應的商品或服務提供給用戶。不管APP仍是用戶,都不想看到,所以,這是不容許發生的狀況,要由程序去控制穩定性。網絡
由此,便引出了這次討論的話題,iOS應用內購買IAP的支付憑證驗證,失敗後的重試機制。dom
整個流程主要分爲如下兩步。atom
首次驗證失敗後,根據設定的重試次數,當即重試指定次數。spa
若是當即重試指定次數仍是失敗,則進入第二步。code
當即重試後仍是失敗,則使用本地文件的方式,保存訂單等相關支付信息。orm
具體方式是,將必要的信息存入NSDictionary,而後保存爲plist文件。plist文件的命名,最好包含用戶ID、訂單ID,和其它具備惟一性的字符,以區分不一樣用戶,不一樣的訂單等。進程
2.1步的保存文件的代碼ip
/** 存儲用戶購買憑證 @param receipt 購買憑證 @param sID 惟一標識(好比UserId) @param orderNum 訂單號 */ + (void)saveReceiptValidation:(NSString *_Nonnull)receipt withID:(NSString *_Nonnull)sID orderNum:(NSString *_Nonnull)orderNum { NSDate *dateSaved = [NSDate date]; NSString *fileName = [NSString stringWithFormat:@"IAPInfo-%@-%@", sID, orderNum]; NSString *fileDir = [[self class] getIAPInfoLocalFilePath:sID]; NSString *savedPath = [NSString stringWithFormat:@"%@%@.plist", fileDir, fileName]; NSDictionary *dic =[NSDictionary dictionaryWithObjectsAndKeys: receipt, kReceipStringKey, dateSaved, kReceipDateKey, sID, kReceipIdKey, orderNum, kOrderNumKey, nil]; NSFileManager *fileManager = [NSFileManager defaultManager]; BOOL isDir = FALSE; BOOL isDirExist = [fileManager fileExistsAtPath:fileDir isDirectory:&isDir]; if(!(isDirExist && isDir)) {//目錄不存在 BOOL bCreateDir = [fileManager createDirectoryAtPath:fileDir withIntermediateDirectories:YES attributes:nil error:nil]; if(!bCreateDir){ NSLog(@"Create Directory Failed."); } else { [[self class] saveFile:savedPath withDictionary:dic]; } } else {//目錄存在,直接保存 [[self class] saveFile:savedPath withDictionary:dic]; } } + (BOOL)saveFile:(NSString *)savedPath withDictionary:(NSDictionary *)dic { BOOL isWrited = [dic writeToFile:savedPath atomically:YES]; NSLog(@"saveReceiptValidation is success ? %@, at savedPath:%@", @(isWrited), savedPath); return isWrited; } + (NSString *)getIAPInfoLocalFilePath:(NSString *)sID { return [NSString stringWithFormat:@"%@/IAPReceipt-%@/", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject], sID]; }
保存信息完成後,則間隔指定時間不斷重試,直到驗證成功,或者APP進程結束。get
間隔時間,可自定義,我的以爲,5分鐘以上的間隔,會比較合適。string
1步和2步的重試邏輯的部分代碼
if (retried < kRetryMax) { //重試 [[self class] validateReceipt:receipt orderNum:orderNum retriedTimes:retried+1 success:success failure:failure]; } else { //重試了kRetryMax次後,還失敗,則建立延時任務,5分鐘後重試 int afterTime = 5 * 60; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(afterTime * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ [[self class] validateReceipt:receipt orderNum:orderNum retriedTimes:0 success:nil failure:nil]; }); //保存憑證 NSString *userId = [TTVUserInfo sharedTTVUserInfo].currentUser.userId; if (userId && userId.length > 0) { [[self class] saveReceiptValidation:receipt withID:userId orderNum:orderNum]; } //錯誤回調 if (failure) { failure(errCode, errMessage); } }
在啓動APP時,若是用戶已經登陸,則將全部驗證失敗的支付憑證從新進行驗證。若是用戶未登陸,則訂閱通知,在用戶登陸首次登陸成功後,從新發起驗證流程。
3步的從新發起驗證流程的部分代碼
/** 驗證receipt失敗,再次驗證 @param sID 惟一標識(好比UserId) */ + (void)resendFailedReceiptValidation:(NSString *)sID { NSFileManager *fileManager = [NSFileManager defaultManager]; NSError *error = nil; NSString *filePath = [[self class] getIAPInfoLocalFilePath:sID]; //搜索該目錄下的全部文件和目錄 NSArray *cacheFileNameArray = [fileManager contentsOfDirectoryAtPath:filePath error:&error]; NSLog(@"resendFailedReceiptValidation has files : %@", cacheFileNameArray); if (error == nil) { for (NSString *name in cacheFileNameArray) { if ([name hasSuffix:@".plist"])//若是有plist後綴的文件,說明就是存儲的購買憑證 { NSString *plistPath = [NSString stringWithFormat:@"%@/%@", filePath, name]; [[self class] resendValidationRequest:plistPath]; } } } else { NSLog(@"getIAPInfoLocalFilePath error:%@", [error domain]); } }
在每次重試時,驗證成功後,須要將本地存儲的文件移除,防止重複驗證。