如何在Swift中使用Siesta Framework上传文件？

Question

问题非常简单：
我需要将.zip文件上传到服务器，如何使用Siesta Framework在Swift中执行此操作？

谢谢。

Answer 1

实际上，以上答案并不完全正确。 由于Siesta长期以来都支持POST请求，因此您可以按照以下方式（例如PNG或JPEG文件上传）在YourAPI类中上传文件（内容类型：multipart / form-data）：

Enter/Leave

要使用它（从您的ViewController）：

class YourAPI {

static let sharedInstance = YourAPI()

private let service = Service(baseURL: "http://your_server/rest/service", standardTransformers: [.text, .image])

private init() {
    // your init code
}

public enum ImageType {
    case png
    case jpeg
}

func generateBoundaryString() -> String {
    return "Boundary-\(UUID().uuidString)"
}

func constructHttpBodyForImageUpload(withBoundary boundary: String, imageData: Data, fileName: String, imageType: ImageType) -> Data {

    let body = NSMutableData()

    var mimetype = "image/png" // default
    if imageType == .jpeg {
        mimetype = "image/jpeg"
    }

    body.append("--\(boundary)\r\n".data(using: String.Encoding.utf8)!)
    body.append("Content-Disposition:form-data; name=\"file\"; filename=\"\(fileName)\"\r\n".data(using: String.Encoding.utf8)!)
    body.append("Content-Type: \(mimetype)\r\n\r\n".data(using: String.Encoding.utf8)!)
    body.append(imageData)
    body.append("\r\n".data(using: String.Encoding.utf8)!)

    body.append("--\(boundary)--\r\n".data(using: String.Encoding.utf8)!)

    return body as Data
}

@discardableResult func uploadImage(_ imageData: Data, fileName: String, imageType: ImageType, onSuccess: @escaping () -> Void, onFailure: @escaping (String) -> Void) -> Request {

    let boundary = generateBoundaryString()

    let request = service.resource("/files/upload").request(.post) {
        // See comments in Siesta Resource.swift class for .post
        $0.httpBody = self.constructHttpBodyForImageUpload(withBoundary: boundary, imageData: imageData, fileName: fileName, imageType: imageType)
        $0.addValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
    }

    // My Server returns me JSON back
    request.onSuccess { entity in
        guard let json: [String: String] = entity.typedContent() else {
            onFailure("JSON parsing error")
            return
        }
        guard let status = json["status"] else {
            onFailure("Responce status is missing")
            return
        }
        print("status = \(status)")
    }.onFailure { (error) in
        onFailure(error.userMessage)
    }

    return request
}

} // YourAPI

另外几天以来，Siesta项目guthub提出了一个拉取请求，以实现：Convenience method for multipart/form-data requests，这可以很快成为框架的标准部分，并可以减少上述样板代码的大小。

Answer 2

根据the GitHub page of Siesta，目前不支持文件上传/下载任务。请参阅此比较图表：