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(Xojo Plugin) 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.

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// 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 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

success = http.SetUrlVar("path_to_item","/somefolder/big.zip")
Dim url As String
url = "https://graph.microsoft.com/v1.0/me/drive/root:/{$path_to_item}:/createUploadSession"
Dim resp As Chilkat.HttpResponse
resp = http.PostJson2(url,"application/json","{}")
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
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
success = jsonSession.Load(resp.BodyStr)

If (resp.StatusCode <> 200) Then

    System.DebugLog(jsonSession.Emit())
    System.DebugLog("Response status = " + Str(resp.StatusCode))

    Return
End If

System.DebugLog(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 Int32
fragSize = 320 * 1024
Dim localFilePath As String
localFilePath = "qa_data/zips/big.zip"

// Upload the file big.zip in 320KiB segments.
Dim fac As New Chilkat.FileAccess
Dim fileSize As Int32
fileSize = fac.FileSize(localFilePath)

// Open the file to get the number of fragments.
success = fac.OpenForRead(localFilePath)
If (success = False) Then
    System.DebugLog(fac.LastErrorText)
    Return
End If

Dim numFragments As Int32
numFragments = fac.GetNumBlocks(fragSize)
fac.FileClose 

Dim i As Int32
i = 0

System.DebugLog("fileSize = " + Str(fileSize))
System.DebugLog("numFragments = " + Str(numFragments))

Dim uploadUrl As New Chilkat.Url
success = 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 Int32
bytesRemaining = 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 Int32
    chunkSize = fragSize
    Dim expectedStatusCode As Int32
    expectedStatusCode = 202
    If (bytesRemaining < chunkSize) Then
        chunkSize = bytesRemaining
        expectedStatusCode = 201
    End If

    System.DebugLog("  this chunkSize = " + Str(chunkSize))

    // Indicate the fragment in the local file to be streamed in the upload.
    sbOffset.Clear 
    success = sbOffset.AppendInt(i * fragSize)
    sbNumBytes.Clear 
    success = sbNumBytes.AppendInt(chunkSize)
    success = 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
    success = sbRange.SetString("bytes start-end/fileSize")
    Dim numReplaced As Int32
    numReplaced = sbRange.ReplaceI("start",i * fragSize)
    numReplaced = sbRange.ReplaceI("end",i * fragSize + chunkSize - 1)
    numReplaced = sbRange.ReplaceI("fileSize",fileSize)
    req.AddHeader "Content-Range",sbRange.GetAsString()
    System.DebugLog("  this content-range: " + sbRange.GetAsString())

    resp = http.SynchronousRequest(uploadUrl.Host,443,True,req)
    If (http.LastMethodSuccess <> True) Then
        System.DebugLog(http.LastErrorText)
        Return
    End If

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

        System.DebugLog(json.Emit())
        System.DebugLog("Response status = " + Str(resp.StatusCode))

        Return
    End If

    System.DebugLog(json.Emit())
    System.DebugLog("---- Chunk " + Str(i) + " uploaded ----")

    bytesRemaining = bytesRemaining - chunkSize
    i = i + 1
Wend

System.DebugLog("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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