转换后的 Base64String 无法上传到 IMGUR API

Question

语言： Swift

目标操作系统： MacOS

我需要将图像编码为 base64 字符串，然后使用 IMGUR api 使用 http post 请求将其上传为 PNG。我有另一个函数，它获取屏幕截图并将其创建为 CGImage 对象。我使用了他们 api R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 中提供的 base64string 示例，这导致了成功的 200 状态代码。不幸的是，用我的 imageToBase64String() 函数（如下）替换此字符串会导致错误 415 状态代码。我能够在 HTML 中显示 Base64 图像字符串，没有任何问题。

将CGImage截图转换为Base64String的函数：

func imageToBase64String(_ cgImage: CGImage) -> String? {
    let imageRep = NSBitmapImageRep(cgImage: cgImage).representation(using: NSBitmapImageRep.FileType.png, properties: [:])
    let base64Image:String = ((imageRep!.base64EncodedString()))
    Logger.write(base64Image)
    return base64Image
}

这里是 imgur 的匿名上传：

func anonymousUpload(_ image: CGImage){
    let base64Image = imageToBase64String(image)!

    // Using this works fine
    //let base64Image = "R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"

    let url = "https://api.imgur.com/3/upload"
    let request = NSMutableURLRequest(url: NSURL(string: url)! as URL)
    request.httpMethod = "POST"
    request.setValue("Client-ID \(imgurAPI.CLIENT_ID)", forHTTPHeaderField: "Authorization")
    let bodyString = "image=\(base64Image)&type=base64&title=sample&description=Desktop screenshot"
    request.httpBody = bodyString.data(using: .utf8)

    let task = URLSession.shared.dataTask(with: request as URLRequest){ data, response, error in
        if (error != nil){
            print("error: \(error)")
            return
        }
        print("response: \(response!)")
        let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
        print("response string: \(responseString!)")

    }
    task.resume()
}

Answer 1

看来我构造的正文不正确。以下是如何执行此操作的正确解决方案。我密切关注 Postmans 生成的 http 代码来构造以下请求：

func anonymousUpload(_ image: CGImage){

    // Convert the file to base64
    let base64Image:String = imageToBase64String(image)!

    // Create our url
    let url = URL(string: "https://api.imgur.com/3/image")!
    let request = NSMutableURLRequest.init(url: url)
    request.httpMethod = "POST"
    request.addValue("Client-ID " + imgurAPI.CLIENT_ID, forHTTPHeaderField: "Authorization")

    // Build our multiform and add our base64 image
    let boundary = NSUUID().uuidString
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
    let body = NSMutableData()
    body.append("--\(boundary)\r\n".data(using: .utf8)!)
    body.append("Content-Disposition: form-data; name=\"image\"\r\n\r\n".data(using: .utf8)!)
    body.append(base64Image.data(using: .utf8)!)
    body.append("\r\n".data(using: .utf8)!)
    body.append("--\(boundary)--\r\n".data(using: .utf8)!)
    request.httpBody = body as Data

    // Begin the session request
    let task = URLSession.shared.dataTask(with: request as URLRequest){ data, response, error in
        if (error != nil){
            print("error: \(error)")
            return
        }

        print("response: \(response!)")
        let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
        print("response string: \(responseString!)")

    }
    task.resume()
}

转换后的 Base64String 无法上传到 IMGUR API

Converted Base64String Fails to Upload to IMGUR API

macos

base64

image

imgur

swift