javascript - Valums Uploader 额外请求负载添加到文件

Question

我正在尝试在 VB 中使用 ASP.NET 设置 Valums 文件 uploader ( https://github.com/valums/file-uploader )。该文件当前正在上传并存储在我想要的位置并且似乎可以正常工作，但是 Firefox 和 Chrome(我假设 Safari 也是)似乎都将一些额外的文本附加到正在上传的实际 CSV 文件中。

例如，这是我在通过 Firefox 上传的文件中看到的:

-----------------------------31203180683076
Content-Disposition: form-data; name="qqfile"; filename="test.csv"
Content-Type: application/vnd.ms-excel

/* ACTUAL CONTENTS OF FILE HERE */

-----------------------------31203180683076--

同样，Chrome:

------WebKitFormBoundarytB00bSQcafSOAnmq
Content-Disposition: form-data; name="qqfile"; filename="test.csv"
Content-Type: application/vnd.ms-excel

/* ACTUAL CONTENTS OF FILE HERE */

------WebKitFormBoundarytB00bSQcafSOAnmq--

如果我在 Chrome 中查看网络面板，我确实看到上面发布的内容在请求负载中发送，但是我想删除它，或者在服务器写入文件时完全忽略它。当我将 paramsInBody: false 添加到 uploader 时，我以为我找到了解决方案，它确实消除了一些困惑，但不是全部。

客户端相关代码如下:

function createUploader() {
    var uploader = new qq.FineUploader({
        element: document.getElementById('bootstrapped-fine-uploader'),
        request: {
            paramsInBody: false,
            endpoint: 'Uploader.ashx'
        },
        validation: {
            allowedExtensions: ['csv', 'txt']
        },
        text: {
            uploadButton: '<div><i class="icon-upload-alt icon-white"></i> Browse for files...</div>'
        },
        template: '<div class="span12"><div class="qq-uploader">' +
                  '<pre class="qq-upload-drop-area span12"><span>{dragZoneText}</span></pre>' +
                  '<div class="qq-upload-button btn btn-success" style="width: auto;">{uploadButtonText}</div>' +
                  '<span class="qq-drop-processing"><span class="qq-drop-processing-spinner"></span></span>' +
                  '<ul class="qq-upload-list" style="margin: 0; list-style-type: none; margin-top: 20px;"></ul>' +
                '</div></div>',
        classes: {
            success: 'alert alert-success',
            fail: 'alert alert-error'
        }
    });
}

这是相关的服务器端处理程序:

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
    On Error GoTo upload_error

    Dim Request = context.Request
    Dim strm As Stream = Request.InputStream
    Dim br As BinaryReader = New BinaryReader(strm)
    Dim fileContents() As Byte = {}
    Const ChunkSize As Integer = 1024 * 1024

    ' We need to hand IE a little bit differently...
    If Request.Browser.Browser = "IE" Then
        Dim myfiles As System.Web.HttpFileCollection = System.Web.HttpContext.Current.Request.Files
        Dim postedFile As System.Web.HttpPostedFile = myfiles(0)
        If Not postedFile.FileName.Equals("") Then
            Dim fn As String = System.IO.Path.GetFileName(postedFile.FileName)
            br = New BinaryReader(postedFile.InputStream)
        End If
    End If

    ' Now have the binary reader on the IE file input Stream. Back to normal...
    Do While br.BaseStream.Position < br.BaseStream.Length - 1
        Dim b(ChunkSize - 1) As Byte
        Dim ReadLen As Integer = br.Read(b, 0, ChunkSize)
        Dim dummy() As Byte = fileContents.Concat(b).ToArray()
        fileContents = dummy
        dummy = Nothing
    Loop

    ' Or write it to the filesystem:
    Dim writeStream As FileStream = New FileStream("C:\TEMP\" & System.Guid.NewGuid.ToString() & ".csv", FileMode.Create)
    Dim bw As New BinaryWriter(writeStream)
    bw.Write(fileContents)
    bw.Close()

    ' it all worked ok so send back SUCCESS is true!
    context.Response.Write("{""success"":true}")
    Exit Sub

upload_error:
    context.Response.Write("{""error"":""An Error Occured""}")
End Sub

关于为什么它会以这种方式工作的任何想法？非常感谢。

Answer 1

我能够通过删除 VB 代码中的浏览器检查来解决这个问题。我没有检查 IE，而是让它在所有浏览器上运行。

在运行调试时，我注意到有些东西被拉出来了，我想使用该条件中的代码将其拉出来，所以我尝试使用 Chrome 运行它，结果运行良好。

VB 的代码现在看起来像这样。我所要做的就是注释掉条件并保持内部完好无损:

'Removed the If conditional and it worked.
'If Request.Browser.Browser = "IE" Then
    Dim myfiles As System.Web.HttpFileCollection = System.Web.HttpContext.Current.Request.Files
    Dim postedFile As System.Web.HttpPostedFile = myfiles(0)
    If Not postedFile.FileName.Equals("") Then
        Dim fn As String = System.IO.Path.GetFileName(postedFile.FileName)
        br = New BinaryReader(postedFile.InputStream)
    End If
'End If