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(VB.NET UWP/WinRT) OneDrive -- Upload Large Files with an Upload Session

Demonstrates how to upload large files with an upload session. See OneDrive Upload Session for more general information.

Note: This example requires Chilkat v9.5.0.68 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http
Dim success As Boolean

'  Use your previously obtained access token here:
'  See the following examples for getting an access token:
'     Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
'     Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
'     Refresh Access Token (Azure AD v2.0 Endpoint).
'     Refresh Access Token (Azure AD Endpoint).

'  (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"

'  ----------------------------------------------------------------------------
'  Step 1: Create an upload session

'  To begin a large file upload, your app must first request a new upload session. This creates a
'  temporary storage location where the bytes of the file will be saved until the complete file is uploaded.
'  Once the last byte of the file has been uploaded the upload session is completed and the final file is shown
'  in the destination folder.

'  Send the following POST to create an upload session:
'  POST /v1.0/users/me/drive/root:/{path_to_item}:/createUploadSession

http.SetUrlVar("path_to_item","/somefolder/big.zip")
Dim url As String = "https://graph.microsoft.com/v1.0/users/me/drive/root:/{$path_to_item}:/createUploadSession"
Dim resp As Chilkat.HttpResponse = Await http.PostJson2Async(url,"application/json","{}")
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


'  If successful, a 200 status code is returned, with the session details (in JSON format).
Dim jsonSession As New Chilkat.JsonObject
jsonSession.EmitCompact = False
jsonSession.Load(resp.BodyStr)

If (resp.StatusCode <> 200) Then

    Debug.WriteLine(jsonSession.Emit())
    Debug.WriteLine("Response status = " & resp.StatusCode)

    Exit Sub
End If




Debug.WriteLine(jsonSession.Emit())

'  A sample response:

'  	{
'  	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#microsoft.graph.uploadSession",
'  	  "uploadUrl": "https://api.onedrive.com/rup/3a33fceb9b74cc15/eyJSZXNvdXJjZUlEI ... 65yDYUiS3JTDnnhqCHxw",
'  	  "expirationDateTime": "2017-06-11T12:40:23.239Z",
'  	  "nextExpectedRanges": [
'  	    "0-"
'  	  ]
'  	}
' 

'  ----------------------------------------------------------------------------
'  Step 2: Upload Data in Segments (a.k.a. Fragments or Chunks)

'  Microsoft states this requirement: Use a fragment size that is a multiple of 320 KiB (320 * 1024 bytes).
'  Failing to use a fragment size that is a multiple of 320 KiB can result in large file transfers failing after the
'  last fragment is uploaded.  (Note: This is a detail imposed by Microsoft's OneDrive server-side implementation.)

Dim fragSize As Integer = 320 * 1024
Dim localFilePath As String = "qa_data/zips/big.zip"

'  Upload the file big.zip in 320KiB segments.
Dim fac As New Chilkat.FileAccess
Dim fileSize As Integer = fac.FileSize(localFilePath)

'  Open the file to get the number of fragments.
success = fac.OpenForRead(localFilePath)
If (success = False) Then
    Debug.WriteLine(fac.LastErrorText)
    Exit Sub
End If

Dim numFragments As Integer = fac.GetNumBlocks(fragSize)
fac.FileClose()

Dim i As Integer = 0

Debug.WriteLine("fileSize = " & fileSize)
Debug.WriteLine("numFragments = " & numFragments)

Dim uploadUrl As New Chilkat.Url
uploadUrl.ParseUrl(jsonSession.StringOf("uploadUrl"))

Dim json As New Chilkat.JsonObject
json.EmitCompact = False

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "PUT"
req.Path = uploadUrl.PathWithQueryParams
req.ContentType = "application/octet-stream"

Dim sbOffset As New Chilkat.StringBuilder
Dim sbNumBytes As New Chilkat.StringBuilder
Dim sbRange As New Chilkat.StringBuilder

'  IMPORTANT: The uploadUrl is a temporary URL to be used to upload the fragment.
'  It requires no authentication (because the URL itself could only have been obtained from an authenticated
'  request to start the upload session).  Therefore, do not allow the upload URL to be publicly seen,
'  otherwise anybody could upload to your OneDrive.
http.AuthToken = ""

Dim bytesRemaining As Integer = fileSize
While i < numFragments

    '  The success response code for intermediate chunks is 202,
    '  whereas the final chunk will have a 201 success response where
    '  the response body is the JSON DriveItem.
    Dim chunkSize As Integer = fragSize
    Dim expectedStatusCode As Integer = 202
    If (bytesRemaining < chunkSize) Then
        chunkSize = bytesRemaining
        expectedStatusCode = 201
    End If

    Debug.WriteLine("  this chunkSize = " & chunkSize)

    '  Indicate the fragment in the local file to be streamed in the upload.
    sbOffset.Clear()
    sbOffset.AppendInt(i * fragSize)
    sbNumBytes.Clear()
    sbNumBytes.AppendInt(chunkSize)
    req.StreamChunkFromFile(localFilePath,sbOffset.GetAsString(),sbNumBytes.GetAsString())

    '  The Content-Range header field must be set for this fragment.  For example:
    '  Content-Range: bytes 0-25/128
    sbRange.SetString("bytes start-end/fileSize")
    Dim numReplaced As Integer = sbRange.ReplaceI("start",i * fragSize)
    numReplaced = sbRange.ReplaceI("end",i * fragSize + chunkSize - 1)
    numReplaced = sbRange.ReplaceI("fileSize",fileSize)
    req.AddHeader("Content-Range",sbRange.GetAsString())
    Debug.WriteLine("  this content-range: " & sbRange.GetAsString())

    resp = Await http.SynchronousRequestAsync(uploadUrl.Host,443,True,req)
    If (http.LastMethodSuccess <> True) Then
        Debug.WriteLine(http.LastErrorText)
        Exit Sub
    End If


    json.Load(resp.BodyStr)
    '  A 202 response status code indicates success.
    If (resp.StatusCode <> expectedStatusCode) Then

        Debug.WriteLine(json.Emit())
        Debug.WriteLine("Response status = " & resp.StatusCode)

        Exit Sub
    End If


    Debug.WriteLine(json.Emit())
    Debug.WriteLine("---- Chunk " & i & " uploaded ----")

    bytesRemaining = bytesRemaining - chunkSize
    i = i + 1
End While

Debug.WriteLine("data uploaded.")

'  ----------------------------------------------------------------------------
'  Sample output for the above session:

'  {
'    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#microsoft.graph.uploadSession",
'    "uploadUrl": "https://api.onedrive.com/rup/3a33fceb9b74cc15/eyJSZXNvd ... QoKK2iuh1A",
'    "expirationDateTime": "2017-06-11T14:04:45.438Z",
'    "nextExpectedRanges": [
'      "0-"
'    ]
'  }
' 
'  fileSize = 1366807
'  numFragments = 5
'    this chunkSize = 327680
'    this content-range: bytes 0-327679/1366807
'  {
'    "expirationDateTime": "2017-06-11T14:04:45.438Z",
'    "nextExpectedRanges": [
'      "327680-1366806"
'    ]
'  }
' 
'  ---- Chunk 0 uploaded ----
'    this chunkSize = 327680
'    this content-range: bytes 327680-655359/1366807
'  {
'    "expirationDateTime": "2017-06-11T14:04:45.438Z",
'    "nextExpectedRanges": [
'      "655360-1366806"
'    ]
'  }
' 
'  ---- Chunk 1 uploaded ----
'    this chunkSize = 327680
'    this content-range: bytes 655360-983039/1366807
'  {
'    "expirationDateTime": "2017-06-11T14:04:45.438Z",
'    "nextExpectedRanges": [
'      "983040-1366806"
'    ]
'  }
' 
'  ---- Chunk 2 uploaded ----
'    this chunkSize = 327680
'    this content-range: bytes 983040-1310719/1366807
'  {
'    "expirationDateTime": "2017-06-11T14:04:45.438Z",
'    "nextExpectedRanges": [
'      "1310720-1366806"
'    ]
'  }
' 
'  ---- Chunk 3 uploaded ----
'    this chunkSize = 56087
'    this content-range: bytes 1310720-1366806/1366807
'  {
'    "createdBy": {
'      "application": {
'        "displayName": "Chilkat",
'        "id": "441c9990"
'      },
'      "user": {
'        "id": "3a33fceb9b74cc15"
'      }
'    },
'    "createdDateTime": "2017-06-04T14:04:47.247Z",
'    "cTag": "aYzozQTMzRkNFQjlCNzRDQzE1ITQ4NjguMjU3",
'    "eTag": "aM0EzM0ZDRUI5Qjc0Q0MxNSE0ODY4LjA",
'    "id": "3A33FCEB9B74CC15!4868",
'    "lastModifiedBy": {
'      "application": {
'        "displayName": "Chilkat",
'        "id": "441c9990"
'      },
'      "user": {
'        "id": "3a33fceb9b74cc15"
'      }
'    },
'    "lastModifiedDateTime": "2017-06-04T14:04:47.247Z",
'    "name": "big.zip",
'    "parentReference": {
'      "driveId": "3a33fceb9b74cc15",
'      "id": "3A33FCEB9B74CC15!4862",
'      "name": "someFolder",
'      "path": "/drive/root:/someFolder"
'    },
'    "size": 1366807,
'    "webUrl": "https://1drv.ms/u/s!ABXMdJvr_DM6pgQ",
'    "file": {
'      "hashes": {
'        "sha1Hash": "252059AA13004220DB912B97D4D3FF9599CCD8D9"
'      },
'      "mimeType": "application/zip"
'    },
'    "fileSystemInfo": {
'      "createdDateTime": "2017-06-04T14:04:47.246Z",
'      "lastModifiedDateTime": "2017-06-04T14:04:47.246Z"
'    },
'    "tags": [
'    ],
'    "lenses": [
'    ]
'  }
' 
'  Response status = 201

 

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