Post 图片如何在 Imgur 用户上线

Question

我在应该允许 post 用户墙上的图像的应用程序下工作。一开始他正在获得授权，在这个阶段一切正常。但是当我尝试发出 post 请求时 - 什么都没有 posted。你能不能帮忙解决下一个问题。当用户 select 一张图片并按下 post 按钮时：

- (void) postActionSelected
{

    NSString *title = [[self titleTextField] text];
    NSString *description = [[self commentTextField] text];

    NSData *imageData = UIImageJPEGRepresentation(self.currentImage.image, 0.5);
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{



    [imgurServerManager uploadPhoto:imageData
                           title:title
                     description:description
                 completionBlock:^(NSString *result) {
                     dispatch_async(dispatch_get_main_queue(), ^{
                         [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
                     });
                 } failureBlock:^(NSURLResponse *response, NSError *error, NSInteger status) {
                     dispatch_async(dispatch_get_main_queue(), ^{
                         [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
                         [[[UIAlertView alloc] initWithTitle:@"Upload Failed"
                                                     message:[NSString stringWithFormat:@"%@ (Status code %ld)", [error localizedDescription], (long)status]
                                                    delegate:nil
                                           cancelButtonTitle:nil
                                           otherButtonTitles:@"OK", nil] show];
                     });
                 }];

});

}

然后在 ImGurServerManager 中 post 应该完成：

+ (void)uploadPhoto:(NSData*)imageData
              title:(NSString*)title
        description:(NSString*)description
    completionBlock:(void(^)(NSString* result))completion
       failureBlock:(void(^)(NSURLResponse *response, NSError *error, NSInteger status))failureBlock
{
    NSAssert(imageData, @"Image data is required");
    //NSAssert(access_token, @"Access token is required");

    NSString *urlString = @"https://api.imgur.com/3/upload";
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];

    NSMutableData *requestBody = [[NSMutableData alloc] init];

    NSString *boundary = @"---------------------------0983745982375409872438752038475287";

    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    //[request addValue:[NSString stringWithFormat:@"access_token %@", access_token] forHTTPHeaderField:@"access_token"];

    [requestBody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary]
          dataUsingEncoding:NSUTF8StringEncoding]];
    [requestBody appendData:[@"Content-Disposition: attachment; name=\"image\"; filename=\".tiff\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

    [requestBody appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [requestBody appendData:[NSData dataWithData:imageData]];
    [requestBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];


    if (title) {
        [requestBody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"title\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[title dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    }


    if (description) {
        [requestBody appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"description\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[description dataUsingEncoding:NSUTF8StringEncoding]];
        [requestBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    }

    [requestBody appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] 
          dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPBody:requestBody];

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
        NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        if ([responseDictionary valueForKeyPath:@"data.error"]) {
            if (failureBlock) {
                if (!error) {

                    error = [NSError errorWithDomain:@"imguruploader" code:10000 userInfo:@{NSLocalizedFailureReasonErrorKey : [responseDictionary valueForKeyPath:@"data.error"]}];
                }
                failureBlock(response, error, [[responseDictionary valueForKey:@"status"] intValue]);
            }
        } else {
            if (completion) {
                completion([responseDictionary valueForKeyPath:@"data.link"]);
            }

        }

    }];
}

我想这里的原因是我错过了一些额外的参数，但我完全迷失了它。提前谢谢你。

Answer 1

正在查看https://api.imgur.com/endpoints/image you see that you need to perform a post with the following parameters (see: ):

我认为你错过了 _params[@"type"] = @"base64";

// Dictionary that holds post parameters. You can set your post parameters that your server accepts or programmed to accept.
NSMutableDictionary* _params = [[NSMutableDictionary alloc] init];
_params[@"type"] = @"base64";
_params[@"name"] = @"myImage";

// the boundary string : a random string, that will not repeat in post data, to separate post data fields.
NSString *BoundaryConstant = [NSString stringWithString:@"----------V2ymHFg03ehbqgZCaKO6jy"];

// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];                                    
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];

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

// post body
NSMutableData *body = [NSMutableData data];

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

// add image data
NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0);
if (imageData) {
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", FileParamConstant] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithString:@"Content-Type: image/jpeg\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}

[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];

// setting the body of the post to the reqeust
[request setHTTPBody:body];

// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

// set URL
[request setURL:requestURL];

Answer 2

终于上传了图片，未 post 未定义的主要原因 access_token:

[request setValue:[NSString stringWithFormat:@"Bearer %@", token] forHTTPHeaderField:@"Authorization"];

并删除带参数的字典，如果 post 请求 Imgur - 没有必要。

(void)uploadPhoto:(NSData*)imageData 标题：（NSString *）标题描述：（NSString *）描述 access_token:(NSString*)令牌主题：（NSString *）主题 completionBlock:(void(^)(NSString* result))完成 failureBlock:(void(^)(NSURLResponse *response, NSError *error, NSInteger status))failureBlock { NSAssert(imageData, @"Image data is required");

NSString *urlString = @"https://api.imgur.com/3/image.json";
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

[request setValue:[NSString stringWithFormat:@"Bearer %@", token] forHTTPHeaderField:@"Authorization"];

[request setURL:[NSURL URLWithString:urlString]];

[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];

[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];

NSMutableData *body = [[NSMutableData alloc] init];

NSString *boundary = @"---------------------------0983745982375409872438752038475287";



NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];

form-data； name=\"%@\"\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];

if (imageData) {


    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: attachment; name=\"image\"; filename=\".tiff\"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

}
    if (title) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"title\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[title dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    }


    if (description) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"description\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[description dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    }


[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];


[request setHTTPBody:body];




[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
    NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    if ([responseDictionary valueForKeyPath:@"data.error"]) {
        if (failureBlock) {
            if (!error) {

                error = [NSError errorWithDomain:@"imguruploader" code:10000 userInfo:@{NSLocalizedFailureReasonErrorKey : [responseDictionary valueForKeyPath:@"data.error"]}];
            }
            failureBlock(response, error, [[responseDictionary valueForKey:@"status"] intValue]);
        }
    } else {
        if (completion) {
            completion([responseDictionary valueForKeyPath:@"data.link"]);
        }

    }

}];

}

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