将分块上传/StartUpload 与 sharepoint REST api 一起使用

Question

我想在线上传大文件到 sahrepoint，但我无法使用 sharepoint REST api 的分块上传。我想看看一个可行的例子。

这里描述了 api https://msdn.microsoft.com/EN-US/library/office/dn450841.aspx#bk_FileStartUpload 使用方法

开始上传（GUID，stream1） 继续上传（GUID，10 MB，stream2）
继续上传（GUID，20 MB，stream3）
完成上传（GUID，30 MB，stream4）

我在 https://social.msdn.microsoft.com/Forums/sqlserver/en-US/5596f87a-3155-4e4f-a6e8-8d38fa5e580d/office-365-onedrive-for-businesssharepoint-rest-api-startupload-command?forum=appsforsharepoint

但该解决方案使用 C#，我需要 REST。

Answer 1

以下 C# 示例展示了如何使用 StartUpload、ContinueUpload 和 FinishUpload REST 端点覆盖现有文件：

    public static void UploadLargeFile(string webUrl, ICredentials credentials, string formDigest, string sourcePath, string targetFolderUrl,int chunkSizeBytes=2048)
    {
        using (var client = new WebClient())
        {
            client.BaseAddress = webUrl;
            client.Credentials = credentials;
            client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
            client.Headers.Add("X-RequestDigest", formDigest);
            client.Headers.Add("content-type", "application/json;odata=verbose");

            //create an empty file first
            var fileName = System.IO.Path.GetFileName(sourcePath);
            var createFileRequestUrl = string.Format("{0}/_api/web/getfolderbyserverrelativeurl('{1}')/files/add(url='{2}',overwrite=true)", webUrl, targetFolderUrl, fileName);
            client.UploadString(createFileRequestUrl, "POST");

            var targetUrl = System.IO.Path.Combine(targetFolderUrl, fileName);
            var firstChunk = true;
            var uploadId = Guid.NewGuid();
            var offset = 0L;

            using (var inputStream = System.IO.File.OpenRead(sourcePath))
            {
                var buffer = new byte[chunkSizeBytes];
                int bytesRead;
                while ((bytesRead = inputStream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    if (firstChunk)
                    {
                        var endpointUrl = string.Format("{0}/_api/web/getfilebyserverrelativeurl('{1}')/startupload(uploadId=guid'{2}')", webUrl, targetUrl, uploadId);
                        client.UploadData(endpointUrl, buffer);
                        firstChunk = false;
                    }
                    else if (inputStream.Position == inputStream.Length)
                    {
                        var endpointUrl = string.Format("{0}/_api/web/getfilebyserverrelativeurl('{1}')/finishupload(uploadId=guid'{2}',fileOffset={3})", webUrl, targetUrl, uploadId, offset);
                        var finalBuffer = new byte[bytesRead];
                        Array.Copy(buffer, finalBuffer, finalBuffer.Length);
                        client.UploadData(endpointUrl, finalBuffer);
                    }
                    else
                    {
                        var endpointUrl = string.Format("{0}/_api/web/getfilebyserverrelativeurl('{1}')/continueupload(uploadId=guid'{2}',fileOffset={3})", webUrl, targetUrl, uploadId, offset);
                        client.UploadData(endpointUrl, buffer);
                    }
                    offset += bytesRead;
                    Console.WriteLine("%{0:P} completed", (((float)offset / (float)inputStream.Length)));
                }
            }
        }

    }

用法

var userCredentials = GetCredentials(userName, password);
var formDigest = RequestFormDigest(webUrl, userCredentials);
UploadLargeFile(webUrl,userCredentials,formDigest, @"C:\Users\jdoe\Documents\SampleVideo_1280x720_5mb.mp4", "/Shared Documents", 1024 * 1024);

• 使用 SharePoint REST 接口 WebClient class，特别是 UploadData Method 用于上传数据。
• GetCredentials.cs - 获取 SharePoint Online 凭据的方法
• SharePoint REST POST 请求需要表单摘要，RequestFormDigest 用于此目的（您可以找到 实现它here)

结果