c# - 无法在 asp.net mvc 中实现将推文和图像一起发送到 twitter

Question

我正在开发 asp.net mvc。我正在尝试实现 twitter compose tweet 机制文本和图像，并将其作为 tweet 在 twitter 中发送。我已遵循 twitter API 1.1 提供的文档.我已经按照 Twitterizer 库来完成这个，但它向我抛出错误，就像 API 版本 1 已被弃用，尽管我使用的是最新版本，它正在为除此之外的其余端点工作。所以我决定自己发起http请求

在我的例子中，我的表单中有文本区域和文件上传控件，例如，

<form method="post" action="/Home/Upload" enctype="multipart/form-data">
<textarea id="message" name="message"></textarea>
<input type="file" name="file"/>
<input type="submit" value="submit"/>
</form>

之后，在我的操作中，我得到了用户选择的图像和他输入到我的操作中的文本。我已经将 HttpPostedPostedFileBase 转换成 byte[] 之类的，

[HttpPost]
        public ActionResult Upload(FormCollection coll, HttpPostedFileBase upfile)
        {

            byte[] data;
            using (Stream inputStream = upfile.InputStream)
            {
                MemoryStream memoryStream = inputStream as MemoryStream;
                if (memoryStream == null)
                {
                    memoryStream = new MemoryStream();
                    inputStream.CopyTo(memoryStream);
                }
                data = memoryStream.ToArray();
            }

            HttpWebRequest webRequest = WebRequest.Create("https://api.twitter.com/1.1/statuses/update_with_media.json") as HttpWebRequest;
            OAuthBase oauth = new OAuthBase();
            string nonce = oauth.GenerateNonce();
            string timeStamp = oauth.GenerateTimeStamp();
            string normalizedUrl;
            string normalizedRequestParameters;
            string sig = oauth.GenerateSignature
            (new System.Uri("https://api.twitter.com/1.1/statuses/update_with_media.json"), consumerKey, consumerSecret, userinfo.AuthToken,
            userinfo.PayUserId, "POST", timeStamp, nonce,
            OAuthBase.SignatureTypes.HMACSHA1, out normalizedUrl,
            out normalizedRequestParameters);
            string header = string.Format(@"OAuth oauth_consumer_key=""{0}"",oauth_signature_method=""{1}"",oauth_timestamp=""{2}"",oauth_nonce=""{3}"",oauth_version=""{4}"",oauth_token=""{5}"",oauth_signature=""{6}""",
            HttpUtility.UrlEncode(consumerKey), HttpUtility.UrlEncode("HMAC-SHA1"), HttpUtility.UrlEncode(timeStamp), HttpUtility.UrlEncode(nonce), HttpUtility.UrlEncode("1.0"), HttpUtility.UrlEncode(userinfo.AuthToken), HttpUtility.UrlEncode(sig));
            webRequest.Headers.Add("Authorization", header);
            webRequest.Method = "POST";
            webRequest.Credentials = CredentialCache.DefaultCredentials;
            ((HttpWebRequest)webRequest).UserAgent = ".NET Framework Example Client";
            Dictionary<string, object> fieldsToInclude = new Dictionary<string, object>();
            fieldsToInclude.Add("status", coll["new_message"]);
            fieldsToInclude.Add("media[]", data);
            string boundary = Guid.NewGuid().ToString().Replace("-", "");
            string dataBoundary = "--------------------r4nd0m";
            string contentType = "multipart/form-data; boundary=" + dataBoundary;
            byte[] mydata = GetMultipartFormData(fieldsToInclude, contentType);
            webRequest.ContentLength = mydata.Length;
            webRequest.ContentType = contentType;
            using (Stream requestStream = webRequest.GetRequestStream())
            {
                if (mydata != null)
                {
                    requestStream.Write(mydata, 0, mydata.Length);
                }
            }
            using (HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(webResponse.GetResponseStream());
                string retVal = reader.ReadToEnd();
            }        

            return View();
        }

在这里，我编写了一种为图像和文本数据准备多部分表单数据结构的方法，例如，

private byte[] GetMultipartFormData(Dictionary<string, object> fieldsToInclude, string boundary)
        {
            Stream formDataStream = new MemoryStream();
            Encoding encoding = Encoding.UTF8;          

            foreach (KeyValuePair<string, object> kvp in fieldsToInclude)
            {
                if (kvp.Value.GetType() == typeof(byte[]))
                {   //assume this to be a byte stream
                    byte[] data = (byte[])kvp.Value;

                    string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: application/octet-stream\r\n\r\n",
                        boundary,
                        kvp.Key,
                        kvp.Key);

                    byte[] headerBytes = encoding.GetBytes(header);

                    formDataStream.Write(headerBytes, 0, headerBytes.Length);
                    formDataStream.Write(data, 0, data.Length);


                }
                else
                {   //this is normal text data
                    string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n",
                        boundary,
                        kvp.Key,
                        kvp.Value);

                    byte[] headerBytes = encoding.GetBytes(header);

                    formDataStream.Write(headerBytes, 0, headerBytes.Length);
                }
            }

            string footer = string.Format("\r\n--{0}--\r\n", boundary);
            formDataStream.Write(encoding.GetBytes(footer), 0, footer.Length);
            formDataStream.Position = 0;
            byte[] returndata = new byte[formDataStream.Length];

            formDataStream.Read(returndata, 0, returndata.Length);
            formDataStream.Close();

            return returndata;
        }

这就是我按照 http 请求将图片上传到 Twitter(也称为使用媒体上传)的方式。但我收到错误 500 内部服务器错误。如果我的程序出错，请指导我。

Answer 1

我是 Tweetinvi 的开发者。上传就这么简单:

var imageBinary = File.ReadAllBytes("path");
var media = Upload.UploadImage(imageBinary);

var tweet = Tweet.PublishTweet("hello", new PublishTweetOptionalParameters
{
    Medias = { media }
});

我认为这可以为您节省很多时间。

用于上传的 Tweetinvi 文档:https://github.com/linvi/tweetinvi/wiki/Upload