在 Swift 中解析多部分 SOAP 响应答案

【问题标题】：Parse a multipart SOAP response in Swift在 Swift 中解析多部分 SOAP 响应
【发布时间】：2020-04-28 14:35:59
【问题描述】：

我正在尝试从肥皂服务下载文件，并且在成功请求后得到以下内容

响应头

multipart/related; type="application/xop+xml"; boundary="uuid:917b60a9-3089-43ad-a8c2-b4a3c62db98c"; start="<root.message@cxf.apache.org>"; start-info="text/xml"

响应正文

--uuid:0a679f64-0753-44fe-b627-2267b5b72b1d
Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
Content-Transfer-Encoding: binary
Content-ID: <root.message@cxf.apache.org>

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns2:leseDokumentResponse xmlns:ns2="http://webservice/"><return><status>OK</status><dokument><xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:c58d3315-9cb6-413a-98a1-5a29671cfdb6-41@cxf.apache.org"/></dokument></return></ns2:leseDokumentResponse></soap:Body></soap:Envelope>
--uuid:0a679f64-0753-44fe-b627-2267b5b72b1d
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary
Content-ID: <c58d3315-9cb6-413a-98a1-5a29671cfdb6-41@cxf.apache.org>

... binary data ...
--uuid:0a679f64-0753-44fe-b627-2267b5b72b1d--

如何解析文件二进制数据？

我尝试了这些问题，但没有任何效果 Parsing http-multipart response Parse multipart response for image download in ios

【问题讨论】：

来自响应头：boundary="uuid:917b60a9-3089-43ad-a8c2-b4a3c62db98c" 与您在正文中获得的边界不同。这正常吗？或者你打印了2个不同的？否则，使用Data的.firstRange(of:)方法，迭代查找所有--uuid:0a679f64-0753-44fe-b627-2267b5b72b1d，即可找到二进制数据。
注意测试，但蒸汽代码 (github.com/vapor/multipart-kit) 对此有用吗？
uuid 应该作为示例而不是按原样，因为它与一个请求不同

标签： swift soap alamofire multipart urlsession

【解决方案1】：

使用 MultipartKit 可以轻松解析多部分 SOAP 响应

我在Alamofire 的DataResponse 上创建了一个扩展来处理响应

import Alamofire
import MultipartKit
import Swime

extension DataResponse where Success == Data {

    var boundary: String? {

        let header = response?.allHeaderFields.first(where: {
            $0.key as? String == "Content-Type"
        })

        let scanner = Scanner(string: header?.value as? String ?? "")

        _ = scanner.scanUpToString("boundary=\"")
        _ = scanner.scanString("boundary=\"")
        let boundary = scanner.scanUpToString("\";")

        return boundary
    }

    func multipartParts() -> [MultipartPart] {

        guard let boundary = boundary else { return [] }

        guard let data = try? result.get() else { return [] }

        let parser = MultipartParser(boundary: boundary)

        var parts: [MultipartPart] = []
        var headers: HTTPHeaders = [:]
        var body: Data = Data()

        parser.onHeader = { (field, value) in
            headers.replaceOrAdd(name: field, value: value)
        }
        parser.onBody = { new in
            body.append(contentsOf: new.readableBytesView)
        }
        parser.onPartComplete = {
            let part = MultipartPart(headers: headers, body: body)
            headers = [:]
            body = Data()
            parts.append(part)
        }

        do {
            try parser.execute(data)
        } catch {
            print(error.localizedDescription)
        }

        return parts
    }

    func parseMultipart() -> (message: String, files: [Data])? {

        let parts = multipartParts()

        let message = parts.first(where: { $0.id == "<root.message@cxf.apache.org>" })?.body.string ?? ""

        let dataPart = parts.filter { $0.id != "<root.message@cxf.apache.org>" }

        let files = dataPart.compactMap { Data(multipart: $0) }

        return (message, files)
    }
}

extension ByteBuffer {
    var string: String {
        return String(decoding: self.readableBytesView, as: UTF8.self)
    }
}

extension MultipartPart {

    /// Gets or sets the `name` attribute from the part's `"Content-ID"` header.
    public var id: String? {
        get { self.headers.first(name: "Content-ID") }
    }
}

然后可以在这样的数据响应中使用：

let request = SessionManager.request(urlRequest).responseData(completionHandler: { response in

    switch response.result {
        case .failure(let error):
            self.alert(error)

        case .success:

            guard let parts = response.parseMultipart() else { return }

            DispatchQueue.main.async {

                self.loadResponse(message: parts.message, files: parts.files)
        }
    }
})

消息 id 可能不同，所以我可能会建议检查类型

希望这会对某人有所帮助。

【讨论】：