使用 Amazon PreSigned URL 上传图片每次都会给出状态码 400 iOS

Question

点数：

我正在努力在我的 iOS 应用程序
现在的问题是我每次上传时都会收到状态码 400
如果正常的话应该会给出204状态码
Pre-Signed URL 在 Postman 上测试时效果很好，但在 App 端不起作用。

实现如下：

- (void)doUploadURL {
    UIImage *myimage = [UIImage imageNamed:@"testimage.png"];
    NSData *imageData = UIImagePNGRepresentation(myimage);

    NSString *boundary = @"---011000010111000001101001";
    NSMutableData *body = [NSMutableData data];
    // AcL parameter
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"acl\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strAcL dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // Content-Type parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"Content-Type\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strContentType dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // key parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"key\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strKey dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // x-amz-meta-filename parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"x-amz-meta-filename\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strMetaFilename dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // X-Amz-Credential parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"X-Amz-Credential\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strCredential dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // X-Amz-Algorithm parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"X-Amz-Algorithm\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strAlgorithm dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // X-Amz-Date parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"X-Amz-Date\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strAmzDate dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // Policy parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"Policy\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strPolicy dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // X-Amz-Signature parameter
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"X-Amz-Signature\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[strSignature dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // file
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: attachment; name=\"file\"; filename=\"testimage.png\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    NSDictionary *headers = @{ @"content-type": @"multipart/form-data"};
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://visual-showcase.s3-ap-southeast-2.amazonaws.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3600.0];
    [request setHTTPMethod:@"POST"];
    [request setAllHTTPHeaderFields:headers];
    [request setHTTPBody:body];

    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
        NSLog(@" Final Response : %d",httpResponse.statusCode);

        if (error) {
            NSLog(@"Error :  %@", error);
            dispatch_async(dispatch_get_main_queue(), ^{
                [[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Failed to upload" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil] show];
                return;
            });
        } else {
            NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;

            NSError *err = nil;
            NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&err];
        }
    }];
    [dataTask resume];
}

响应码：

<NSHTTPURLResponse: 0x7d10e2c0> { status code: 400, headers {
    Connection = close;
    "Content-Type" = "application/xml";
    Date = "Thu, 02 Feb 2017 07:20:18 GMT";
    Server = AmazonS3;
    "Transfer-Encoding" = Identity;
    "x-amz-id-2" = "HIFhwBaj/ejjGoCgD2vacG2AtoxEFDXxSr6eulZtzUbuLoTcLT+AA9k6093Jyv5OIuK2wpi7+9c=";
    "x-amz-request-id" = C221CD8DA2D80BCD;
} }

问题：

我的问题是，使用 Amazon Pre-Signed URL 上传文件时，我们需要设置什么吗？或者我们可以像正常的 API 调用一样实现它 ?
据我所知，它应该像正常一样以类似的方式实现 APIs
请让我得到任何提示，或者如果我在请求格式中做错了什么

提前致谢。

Answer 1

终于通过更改请求参数格式解决了问题。下面是工作代码。

- (void)doUploadURL {
    UIImage *myimage = [UIImage imageNamed:@"testimage.png"];
    NSData *imageData = UIImagePNGRepresentation(myimage);

    NSString *boundary = @"------VohpleBoundary4QuqLuM1cE5lMwCy";
    NSMutableData *body = [NSMutableData data];

    //Populate a dictionary with all the regular values you would like to send.
    NSMutableDictionary *parameters = [[NSMutableDictionary alloc] init];
    [parameters setValue:strAcL forKey:@"acl"];
    [parameters setValue:strContentType forKey:@"Content-Type"];
    [parameters setValue:strKey forKey:@"key"];
    [parameters setValue:strMetaFilename forKey:@"x-amz-meta-filename"];
    [parameters setValue:strCredential forKey:@"X-Amz-Credential"];
    [parameters setValue:strAlgorithm forKey:@"X-Amz-Algorithm"];
    [parameters setValue:strAmzDate forKey:@"X-Amz-Date"];
    [parameters setValue:strPolicy forKey:@"Policy"];
    [parameters setValue:strSignature forKey:@"X-Amz-Signature"];

    // add params (all params are strings)
    for (NSString *param in parameters) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@\r\n", [parameters objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    // Upload image
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"testimage.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type:image/png\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

    //Close off the request with the boundary
    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"APIURL"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:3600.0];
    [request setHTTPMethod:@"POST"];

    // set Content-Type in HTTP header
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField: @"Content-Type"];

    [request setHTTPBody:body];

    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;

        if (error) {
            NSLog(@"Error :  %@", error);
            dispatch_async(dispatch_get_main_queue(), ^{
                [[[UIAlertView alloc] initWithTitle:@"Alert" message:@"Failed to upload" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil] show];
                return;
            });
        } else {
            NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
            NSError *err = nil;
            NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&err];
        }
    }];
    [dataTask resume];
}

希望对大家有所帮助。

使用 Amazon PreSigned URL 上传图片每次都会给出状态码 400 iOS

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