Question

我正在尝试在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艰难的部分。在此页面上：

http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/rest-signature.html

它说“使用SHA256哈希算法计算符合RFC 2104的HMAC”。亚马逊还提供了一个java类来为您执行此操作：

http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/AuthJavaSampleSig2.html

有人知道如何在Objective-C中做到这一点吗？我查看了AWS iOS SDK，但它似乎没有包含产品广告API。

Answer 1

实际上，AWS iOS SDK DID有一个静态方法来处理所有身份验证情况。也许你应该看一眼AmazonAuthUtils.h：

+(NSString *)HMACSign:(NSData *)data withKey:(NSString *)key usingAlgorithm:(CCHmacAlgorithm)algorithm;
+(NSData *)sha256HMac:(NSData *)data withKey:(NSString *)key;

您可以在文档中找到它：http://docs.amazonwebservices.com/AWSiOSSDK/latest/Classes/AmazonAuthUtils.html

Answer 2

只是为camelcc的优秀观察添加一点。这确实适用于签署对Amazon Product Advertising API的请求。为了让它发挥作用，我不得不陷入困境。

安装SDK并#import <AWSiOSSDK/AmazonAuthUtils.h>

首先，您必须按照亚马逊文档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/

请注意字符串中需要换行符，我的无符号字符串看起来像这样

@"GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=<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，但在正确的位置有\n个字符。将此转换为NSData就像这样

NSData *dataToSign = [unsignedString dataUsingEncoding:NSUTF8StringEncoding];

然后致电

[AmazonAuthUtils HMACSign:dataToSign withKey:SECRET_KEY usingAlgorithm:kCCHmacAlgSHA256]

这会将您的签名作为NSString返回。你需要对此进行URL编码（即交换％0x符号的非法/不安全字符（即'='转换为'％3D'））

完成后，请将其粘贴在您的请求中，希望您好好去！

Answer 3

查看我的亚马逊产品广告客户https://github.com/m1entus/RWMAmazonProductAdvertisingManager

一些带有请求序列化的代码：

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;

}

Answer 4

感谢此页面上的所有答案。这对我有用（Swift 3.0）：

Podfile：

pod 'AWSAPIGateway', '~> 2.4.7'

Swift代码

static let kAmazonAccessID = "BLAH BLAH BLAH"
static let kAmazonAccessSecretKey = "BLAH BLAH BLAH"

static let kAmazonAssociateTag = "BLAH BLAH BLAH"
private let timestampFormatter: DateFormatter

init() {
    timestampFormatter = DateFormatter()
    timestampFormatter.timeZone = TimeZone(identifier: "GMT")
    timestampFormatter.dateFormat = "YYYY-MM-dd'T'HH:mm:ss'Z'"
    timestampFormatter.locale = Locale(identifier: "en_US_POSIX")
}

private func signedParametersForParameters(parameters: [String: String]) -> [String: String] {
    let sortedKeys = Array(parameters.keys).sorted(by: <)

    let query = sortedKeys.map { String(format: "%@=%@", $0, parameters[$0] ?? "") }.joined(separator: "&")

    let stringToSign = "GET\nwebservices.amazon.com\n/onca/xml\n\(query)"

    let dataToSign = stringToSign.data(using: String.Encoding.utf8)
    let signature = AWSSignatureSignerUtility.hmacSign(dataToSign, withKey: AmazonAPI.kAmazonAccessSecretKey, usingAlgorithm: UInt32(kCCHmacAlgSHA256))!

    var signedParams = parameters;
    signedParams["Signature"] = urlEncode(signature)

    return signedParams
}

public func urlEncode(_ input: String) -> String {
    let allowedCharacterSet = (CharacterSet(charactersIn: "!*'();:@&=+$,/?%#[] ").inverted)

    if let escapedString = input.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet) {
        return escapedString
    }

    return ""
}

func send(url: String) -> String {
    guard let url = URL(string: url) else {
        print("Error! Invalid URL!") //Do something else
        return ""
    }

    let request = URLRequest(url: url)
    let semaphore = DispatchSemaphore(value: 0)

    var data: Data? = nil

    URLSession.shared.dataTask(with: request) { (responseData, _, _) -> Void in
        data = responseData
        semaphore.signal()
    }.resume()

    semaphore.wait(timeout: .distantFuture)

    let reply = data.flatMap { String(data: $0, encoding: .utf8) } ?? ""
    return reply
}

这是向亚马逊询问产品价格的功能：

public func getProductPrice(_ asin: AmazonStandardIdNumber) -> Double {

    let operationParams: [String: String] = [
        "Service": "AWSECommerceService",
        "Operation": "ItemLookup",
        "ResponseGroup": "Offers",
        "IdType": "ASIN",
        "ItemId": asin,
        "AWSAccessKeyId": urlEncode(AmazonAPI.kAmazonAccessID),
        "AssociateTag": urlEncode(AmazonAPI.kAmazonAssociateTag),
        "Timestamp": urlEncode(timestampFormatter.string(from: Date())),]

    let signedParams = signedParametersForParameters(parameters: operationParams)

    let query = signedParams.map { "\($0)=\($1)" }.joined(separator: "&")
    let url = "http://webservices.amazon.com/onca/xml?" + query

    let reply = send(url: url)

    // USE THE RESPONSE
}

Answer 5

P-double帖子缺少几个步骤。

在构造无符号字符串之前，您需要获取Timestamp值。

NSTimeZone *zone = [NSTimeZone defaultTimeZone];                //get the current application default time zone
NSInteger interval = [zone secondsFromGMTForDate:[NSDate date]];//sec Returns the time difference of the current application with the world standard time (Green Venice time)

NSDate *nowDate = [NSDate dateWithTimeIntervalSinceNow:interval];
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];

[formatter setTimeZone:[NSTimeZone systemTimeZone]];// get current date/time
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];

// display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
[dateFormatter setDateFormat:@"yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"];
NSString *currentTime = [dateFormatter stringFromDate:nowDate];

NSString* encodedTime = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (__bridge CFStringRef) currentTime,NULL, CFSTR("!*'();:@&=+$,/?%#[]"),kCFStringEncodingUTF8));

NSString* unsignedString = [NSString stringWithFormat:@"GET\nwebservices.amazon.com\n/onca/xml\nAWSAccessKeyId=AKIAI443QEMWI6KW55QQ&AssociateTag=sajjmanz-20&Condition=All&IdType=ASIN&ItemId=3492264077&Operation=ItemLookup&ResponseGroup=Images%%2CItemAttributes%%2COffers&Service=AWSECommerceService&Timestamp=%@&Version=2011-08-01", encodedTime];

一旦日期是url友好编码，其余步骤就像魅力一样。

最后，我还使用上面列出的CFURLCreateStringByAddingPercentEscapes来编码由AmazonAuthUtils HMACSign消息调用生成的字符串。

Answer 6

如果没有亚马逊的明确书面同意，在iOS应用中使用亚马逊的产品广告API并不是“合法的”（根据亚马逊自己的指导原则），我是错的吗？

Answer 7

Swift 2.0

这是一个为Swift签署一组参数的函数。请注意，此代码需要安装Alamofire和AWSCore Cocoapods。您还需要在Objective-C Bridging标头中添加#import <CommonCrypto/CommonCrypto.h>，否则将无法找到kCCHmacAlgSHA256。

private func signedParametersForParameters(parameters: [String: String]) -> [String: String] {
    let sortedKeys = Array(parameters.keys).sort(<)

    var components: [(String, String)] = []
    for key in sortedKeys {
        components += ParameterEncoding.URLEncodedInURL.queryComponents(key, parameters[key]!)
    }

    let query = (components.map { "\($0)=\($1)" } as [String]).joinWithSeparator("&")

    let stringToSign = "GET\nwebservices.amazon.com\n/onca/xml\n\(query)"
    let dataToSign = stringToSign.dataUsingEncoding(NSUTF8StringEncoding)
    let signature = AWSSignatureSignerUtility.HMACSign(dataToSign, withKey: kAmazonAccessSecretKey, usingAlgorithm: UInt32(kCCHmacAlgSHA256))!

    let signedParams = parameters + ["Signature": signature]

    return signedParams
}

它被称为：

let operationParams: [String: String] = ["Service": "AWSECommerceService", "Operation": "ItemLookup", "ItemId": "045242127733", "IdType": "UPC", "ResponseGroup": "Images,ItemAttributes", "SearchIndex": "All"]
let keyParams = ["AWSAccessKeyId": kAmazonAccessID, "AssociateTag": kAmazonAssociateTag, "Timestamp": timestampFormatter.stringFromDate(NSDate())]
let fullParams = operationParams + keyParams

let signedParams = signedParametersForParameters(fullParams)

Alamofire.request(.GET, "http://webservices.amazon.com/onca/xml", parameters: signedParams).responseString { (response) in
    print("Success: \(response.result.isSuccess)")
    print("Response String: \(response.result.value)")
}

最后，timestampFormatter声明如下：

private let timestampFormatter: NSDateFormatter

init() {
    timestampFormatter = NSDateFormatter()
    timestampFormatter.dateFormat = AWSDateISO8601DateFormat3
    timestampFormatter.timeZone = NSTimeZone(name: "GMT")
    timestampFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
}

您可以使用/修改以满足您的需求，但必要的一切都应该在那里。

Answer 8

您可以使用SecTransforms代替使用在现代OS X中弃用的CommonCrypto：

CFErrorRef error = NULL;

SecTransformRef digestRef = SecDigestTransformCreate(kSecDigestHMACSHA2, 256, &error);
SecTransformSetAttribute(digestRef, kSecTransformInputAttributeName, (__bridge CFDataRef)self, &error);
SecTransformSetAttribute(digestRef, kSecDigestHMACKeyAttribute, (__bridge CFDataRef)key, &error);

CFDataRef resultData = SecTransformExecute(digestRef, &error);
NSData* hashData = (__bridge NSData*)resultData;

CFRelease(digestRef);

iOS中的亚马逊产品广告API签名

8 个答案: