iOS中的亚马逊产品广告API签名
我试图在我的iOS应用程序中访问亚马逊的产品广告API。 创建签名似乎是一个棘手的部分。 在本页：
http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/rest-signature.html
它说“用SHA256哈希算法计算符合RFC 2104的HMAC”。 亚马逊还提供了一个java类来为你做这件事：
http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/AuthJavaSampleSig2.html
有人知道我可以在Objective-C中做到这一点吗？ 我查看了AWS iOS SDK，但似乎没有包含产品广告API。
实际上，AWS iOS SDK DID具有处理所有身份验证情况的静态方法。 也许你应该AmazonAuthUtils.h ：
+(NSString *)HMACSign:(NSData *)data withKey:(NSString *)key usingAlgorithm:(CCHmacAlgorithm)algorithm;
+(NSData *)sha256HMac:(NSData *)data withKey:(NSString *)key;
你可以在文档中找到它：http://docs.amazonwebservices.com/AWSiOSSDK/latest/Classes/AmazonAuthUtils.html
只是为了增加一点camelcc的优秀观察。 这确实适用于向亚马逊产品广告API签名请求。 为了让它工作，我不得不瞎搞。
安装SDK并使用#import <AWSiOSSDK/AmazonAuthUtils.h>
首先，您必须按照亚马逊文档的顺序将请求字符串组织成正确的顺序。 我发现这个页面在解释如何订购请求时非常有用
http://skilldrick.co.uk/2010/02/amazon-product-information-via-amazon-web-services/
注意字符串中需要换行字符，我的无符号字符串看起来像这样
@"GETnecs.amazonaws.comn/onca/xmlnAWSAccessKeyId=<ACCESS_KEY_ID>&AssociateTag=<ASSOCIATE_ID>&Keywords=harry%20potter&Operation=ItemSearch&SearchIndex=Books&Service=AWSECommerceService&Timestamp=2012-07-03T10%3A52%3A21.000Z&Version=2011-08-01"
在任何地方都没有空格，但在正确的位置放置n字符。 像这样将其转换为NSData
NSData *dataToSign = [unsignedString dataUsingEncoding:NSUTF8StringEncoding];
然后打电话
[AmazonAuthUtils HMACSign:dataToSign withKey:SECRET_KEY usingAlgorithm:kCCHmacAlgSHA256]
这会将您的签名作为NSString返回。 您需要对此网址进行网址编码（即交换％0x符号的非法/不安全文字记录器（即'='转换为'％3D'））
完成此操作后，请将其粘贴在您的要求中，并希望您能顺利出发！
查看我的亚马逊产品广告客户端https://github.com/m1entus/RWMAmazonProductAdvertisingManager
一些带有最新序列号的代码：
NSString * const RWMAmazonProductAdvertisingStandardRegion = @"webservices.amazon.com";
NSString * const RWMAmazonProductAdvertisingAWSAccessKey = @"AWSAccessKeyId";
NSString * const RWMAmazonProductAdvertisingTimestampKey = @"Timestamp";
NSString * const RWMAmazonProductAdvertisingSignatureKey = @"Signature";
NSString * const RWMAmazonProductAdvertisingVersionKey = @"Version";
NSString * const RWMAmazonProductAdvertisingCurrentVersion = @"2011-08-01";
NSData * RWMHMACSHA256EncodedDataFromStringWithKey(NSString *string, NSString *key) {
NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding];
CCHmacContext context;
const char *keyCString = [key cStringUsingEncoding:NSASCIIStringEncoding];
CCHmacInit(&context, kCCHmacAlgSHA256, keyCString, strlen(keyCString));
CCHmacUpdate(&context, [data bytes], [data length]);
unsigned char digestRaw[CC_SHA256_DIGEST_LENGTH];
NSUInteger digestLength = CC_SHA256_DIGEST_LENGTH;
CCHmacFinal(&context, digestRaw);
return [NSData dataWithBytes:digestRaw length:digestLength];
}
NSString * RWMISO8601FormatStringFromDate(NSDate *date) {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[dateFormatter setDateFormat:@"YYYY-MM-dd'T'HH:mm:ss'Z'"];
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
return [dateFormatter stringFromDate:date];
}
NSString * RWMBase64EncodedStringFromData(NSData *data) {
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000
return [data base64EncodedStringWithOptions:0];
#else
return [data base64Encoding];
#endif
}
//http://docs.aws.amazon.com/AWSECommerceService/latest/DG/rest-signature.html
- (NSURLRequest *)requestBySerializingRequest:(NSURLRequest *)request
withParameters:(id)parameters
error:(NSError * __autoreleasing *)error
{
NSParameterAssert(request);
NSMutableURLRequest *mutableRequest = [request mutableCopy];
if (self.accessKey && self.secret) {
NSMutableDictionary *mutableParameters = [parameters mutableCopy];
NSString *timestamp = RWMISO8601FormatStringFromDate([NSDate date]);
if (!mutableParameters[RWMAmazonProductAdvertisingAWSAccessKey]) {
[mutableParameters setObject:self.accessKey forKey:RWMAmazonProductAdvertisingAWSAccessKey];
}
mutableParameters[RWMAmazonProductAdvertisingVersionKey] = RWMAmazonProductAdvertisingCurrentVersion;
mutableParameters[RWMAmazonProductAdvertisingTimestampKey] = timestamp;
NSMutableArray *canonicalStringArray = [[NSMutableArray alloc] init];
for (NSString *key in [[mutableParameters allKeys] sortedArrayUsingSelector:@selector(compare:)]) {
id value = [mutableParameters objectForKey:key];
[canonicalStringArray addObject:[NSString stringWithFormat:@"%@=%@", key, value]];
}
NSString *canonicalString = [canonicalStringArray componentsJoinedByString:@"&"];
canonicalString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(__bridge CFStringRef)canonicalString,
NULL,
CFSTR(":,"),
kCFStringEncodingUTF8));
NSString *method = [request HTTPMethod];
NSString *signature = [NSString stringWithFormat:@"%@n%@n%@n%@",method,self.region,self.formatPath,canonicalString];
NSData *encodedSignatureData = RWMHMACSHA256EncodedDataFromStringWithKey(signature,self.secret);
NSString *encodedSignatureString = RWMBase64EncodedStringFromData(encodedSignatureData);
encodedSignatureString = CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(__bridge CFStringRef)encodedSignatureString,
NULL,
CFSTR("+="),
kCFStringEncodingUTF8));
canonicalString = [canonicalString stringByAppendingFormat:@"&%@=%@",RWMAmazonProductAdvertisingSignatureKey,encodedSignatureString];
mutableRequest.URL = [NSURL URLWithString:[[mutableRequest.URL absoluteString] stringByAppendingFormat:mutableRequest.URL.query ? @"&%@" : @"?%@", canonicalString]];
} else {
if (error) {
NSDictionary *userInfo = @{NSLocalizedDescriptionKey: NSLocalizedStringFromTable(@"Access Key and Secret Required", @"RWMAmazonProductAdvertisingManager", nil)};
*error = [[NSError alloc] initWithDomain:RWMAmazonProductAdvertisingManagerErrorDomain code:NSURLErrorUserAuthenticationRequired userInfo:userInfo];
}
}
return mutableRequest;
}