我正在使用亚马逊网络服务来获取产品价格。
它工作正常,但是在亚马逊对 API 中的 associateTag 成为强制参数进行更改后,它开始出现错误。所以我在请求中放置了一个关联的标签:
tempQueryString =[NSString stringWithFormat:@"GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=AKIAJ3A3LA5NYXWPSTGQ&IdType=ASIN&ItemId=B003VKR0J0&MerchantId=Amazon&AssociateTag=babyformu-20&Operation=ItemLookup&ResponseGroup=Large&Service=AWSECommerceService&SignatureVersion=2&SignatureMethod=HmacSHA256&Timestamp=%@T%@%@%@Z&Version=2010-01-01",str2,hour,mint,s];
现在它给出了这个错误:
"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details."
我没有对签名方法进行任何更改。这里是:
NSString *key = @"9at/FN4mouFxnIV2SsoQTR4iO6x6AWVt2xFvEwmv"; // private key
NSLog(@"current: %@ ",queryString);
NSString *data = queryString;
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
length:sizeof(cHMAC)];
hash = [HMAC base64Encoding];
NSLog(@"hash value11 == %@",hash);
encodedString = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)hash, NULL, CFSTR(":/?#[]@!$&’()*+,;="), kCFStringEncodingUTF8);
我正在使用这个 api 来获取产品详细信息:
query=[NSString stringWithFormat:@"http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=AKIAJ3A3LA5NYXWPSTGQ&IdType=ASIN&ItemId=B003VKR0J0&AssociateTag=babyformu-20&MerchantId=Amazon&Operation=ItemLookup&ResponseGroup=Large&Service=AWSECommerceService&Timestamp=%@T%@:%@:%@Z&Version=2009-03-31&Signature=%@",str2,h,m,s,encodedString];
提前致谢。