Mimecast API - 发送附件

Question

我们正在使用 Mimecast API 从本地程序发送电子邮件/附件。我们的电子邮件确实使用 Mimecast 的示例代码（没有附件）发送出去，但我们在发送附件时遇到了问题。（我确实检查了 Mimecast 的 API 论坛，但没有像这样的标记问题，所以我想我会试试。）

有问题的附件是一个 PDF 文件，这是我们正在使用的代码。我们看到远程服务器强行关闭连接的异常。我们尝试添加：

System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

但我们得到了相同的结果。我们尝试调整 Content-Type 但无济于事（除了 octet-stream 之外的任何其他方法都会使 Mimecast 抛出不受支持的对象错误。）我们使用的来自 Mimecast 的 API 文档的代码是：

static void uploadAttachmentToMimecast()
{
    //Setup required variables
    string baseUrl = "https://us-api.mimecast.com";
    string uri = "/api/file/file-upload";
    String accessKey = "accesskeyhere";
    String secretKey = "secretkeyhere";
    String appId = "ourappId";
    String appKey = "ourappKey";
    string fileName = @"C:\Path\Hello.pdf";
    // thought I'd try this but it isn't working either... I was hoping it was an SSL thing. 
    System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

    //Generate request header values
    string hdrDate = System.DateTime.Now.ToUniversalTime().ToString("R");
    string requestId = System.Guid.NewGuid().ToString();

    //Generate sha256 of the file to upload
    string sha256 = generateSha256(fileName);

    //Get the file size of the file to upload
    long fileSize = new System.IO.FileInfo(fileName).Length;

    //Create the HMAC SHA1 of the Base64 decoded secret key for the Authorization header
    System.Security.Cryptography.HMAC h = new System.Security.Cryptography.HMACSHA1(System.Convert.FromBase64String(secretKey));

    //Use the HMAC SHA1 value to sign the hdrDate + ":" requestId + ":" + URI + ":" + appkey
    byte[] hash = h.ComputeHash(System.Text.Encoding.Default.GetBytes(hdrDate + ":" + requestId + ":" + uri + ":" + appKey));

    //Build the signature to be included in the Authorization header in your request
    string signature = "MC " + accessKey + ":" + System.Convert.ToBase64String(hash);

    //Build Request
    System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(baseUrl + uri);
    request.Method = "POST";
    request.ContentType = "application/octet-stream";

    //Add Headers
    request.Headers[System.Net.HttpRequestHeader.Authorization] = signature;
    request.Headers.Add("x-mc-date", hdrDate);
    request.Headers.Add("x-mc-req-id", requestId);
    request.Headers.Add("x-mc-app-id", appId);
    request.Headers.Add("x-mc-arg", "{'data': [{'sha256': '" + sha256 + "', 'fileSize': " + fileSize.ToString() + "}]}");

    //Add request body
    //Create and write data to stream
    var payload = System.IO.File.ReadAllBytes(fileName);

    System.IO.Stream stream = request.GetRequestStream();
    stream.Write(payload, 0, payload.Length);
    stream.Close();

    //Send Request
    System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();

    //Output response to console
    System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream());
    string responseBody = "";
    string temp = null;
    while ((temp = reader.ReadLine()) != null)
    {
        responseBody += temp;
    };
    System.Console.WriteLine(responseBody);
    System.Console.ReadLine();
}

public static string generateSha256(string fileName)
{
    using (System.IO.FileStream post_stream = System.IO.File.OpenRead(fileName))
    {
        System.Security.Cryptography.SHA256Managed sha = new System.Security.Cryptography.SHA256Managed();
        byte[] file_hash = sha.ComputeHash(post_stream);
        return System.BitConverter.ToString(file_hash).Replace("-", System.String.Empty);
    }
}

抛出实际错误的行是：

System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();

如果有人有使用 Mimecast API 的经验并且有任何想法可以帮助我们阐明这一点，我们将不胜感激。谢谢

Answer 1

如果将来有人遇到这种情况，在用头撞墙之前，请在您的 Mimecast 服务 API 门户中重新生成您的服务帐户密钥（并撤销之前的密钥。）这似乎由于某种原因成为问题..

Mimecast API - 发送附件

Mimecast API - Send Attachment

c#

email-attachments