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如何在iOS Swift中进行产品搜索API?

swift3 amazon-web-services swift ios

PvDev · 技术社区 · 6 年前

Let SortedKeys=数组(parameters.keys)。排序(按:<) 返回已签名的参数让allowedCharacterset=(characterset(charactersin:“!*'();:@&=+$,/?%#[]“”。倒置) 返回逃逸环 guard let url=url(字符串:url)else{ 数据=响应数据 } 让reply=data.flatmap string(数据:$0,编码:.utf8)?“”“ timestampformatter.timezone=时区(标识符:“gmt”) //让responseGroupImages:string=“图像” let operationparams:[字符串:字符串]。=[ “keywords”:搜索关键字, 让signedParams=signedParametersForParameters(参数:operationParams) 让url=“http://webservices.amazon.in/onca/xml?”+查询让reply=send(url:url) //activityIndicator.StopAnimating()。 } GetSearchItem(搜索关键字:SearchKeyword)


   
我的问题是当点击搜索按钮时,搜索的产品没有被列出。我不知道犯了什么错误。有人能帮我摆脱这个麻烦吗?

以下是我尝试获取亚马逊搜索的代码:

     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.in\n/onca/xml\n\(query)"
    print("stringToSign::::\(stringToSign)")

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

    var signedParams = parameters;
    signedParams["Signature"] = urlEncode(signature)
    print("urlencodesignature::\(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 {
 //        activityIndicator.startAnimating()
    guard let url = URL(string: url) else {
        print("Error! Invalid URL!") //Do something else
 //            activityIndicator.stopAnimating()
        return ""
    }
    print("send URL: \(url)")
    let request = URLRequest(url: url)
    let semaphore = DispatchSemaphore(value: 0)

    var data: Data? = nil

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

        print("send URL session data: \(String(describing: data))")
        let parser = XMLParser(data: data!)
        parser.delegate = self as? XMLParserDelegate
        if parser.parse() {
            print(self.results ?? "No results")
        }
        semaphore.signal()

        }.resume()

 //        activityIndicator.stopAnimating()
    semaphore.wait(timeout: .distantFuture)

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

public func getSearchItem(searchKeyword: String) -> [String:AnyObject]{

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

//        let responsegroupitem: String = "ItemAttributes"
//        let responsegroupImages:String = "Images"

//        activityIndicator.startAnimating()
    let operationParams: [String: String] = [
        "Service": "AWSECommerceService",
        "Operation": "ItemSearch",
        "ResponseGroup": "Images,ItemAttributes",
        "IdType": "ASIN",
        "SearchIndex":"All",
        "Keywords": searchKeyword,
        "AWSAccessKeyId": urlEncode(CameraViewController.kAmazonAccessID),
        "AssociateTag": urlEncode(CameraViewController.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.in/onca/xml?" + query
    print("querydata::::\(query)")

    let reply = send(url: url)
    print("reply::::\(reply)")
 //        activityIndicator.stopAnimating()



    return [:]
}




func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {

  getSearchItem(searchKeyword: searchKeyword)

}


这是我的控制台输出:

1 回复 | 直到 6 年前

Scriptable 6 年前

根据 documentation

此外,还需要对发送的值进行百分比编码。您正在响应组属性中发送逗号,该属性应为百分比编码

let operationParams: [String: String] = [
    "Service": "AWSECommerceService",
    "Operation": "ItemSearch",
    "ResponseGroup": urlEncode("Images,ItemAttributes"),
    "IdType": "ASIN",
    "SearchIndex":"All",
    "Keywords": urlEncode(searchKeyword),
    "AWSAccessKeyId": urlEncode(CameraViewController.kAmazonAccessID),
    "AssociateTag": urlEncode(CameraViewController.kAmazonAssociateTag),
    "Timestamp": urlEncode(timestampFormatter.string(from: Date()))]

let stringToSign = "GET\n/onca/xml\n\(query)"