B4X Requires Chilkat v11.0.0+
B4X
OneDrive -- Upload Large Files with an Upload Session
See more OneDrive Examples
Demonstrates how to upload large files with an upload session. See OneDrive Upload Session for more general information.Chilkat B4X Downloads
Dim success As Boolean = False
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
' This example uses the OAuth client credentials flow.
' See How to Create an Azure App Registration for OAuth 2.0 Client Credentials
' Use your client ID, client secret, and tenant ID in the following lines
Dim json As ChilkatJsonObject
json.Initialize
json.UpdateString("client_id", "2871da2c-8176-4b7f-869b-2311aa82e743")
json.UpdateString("client_secret", "2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH")
json.UpdateString("scope", "https://graph.microsoft.com/.default")
json.UpdateString("token_endpoint", "https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token")
Dim http As ChilkatHttp
http.Initialize("http")
http.AuthToken = json.Emit
' ----------------------------------------------------------------------------
' 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:
' If not using "me", then the path should be /v1.0/users/{id | userPrincipalName}/...
' POST /v1.0/users/{user_id}/drive/root:/{path_to_item}:/createUploadSession
http.SetUrlVar("path_to_item", "/somefolder/big.zip")
http.SetUrlVar("user_id", "4fe732c3-322e-4a6b-b729-2fd1eb5c6104")
Dim url As String = "https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:/{$path_to_item}:/createUploadSession"
Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpStr("POST", url, "{}", "utf-8", "application/json", resp)
If success = False Then
Log(http.LastErrorText)
Return
End If
' If successful, a 200 status code is returned, with the session details (in JSON format).
Dim jsonSession As ChilkatJsonObject
jsonSession.Initialize
jsonSession.EmitCompact = False
jsonSession.Load(resp.BodyStr)
If resp.StatusCode <> 200 Then
Log(jsonSession.Emit)
Log("Response status = " & resp.StatusCode)
Return
End If
Log(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 Int = 320 * 1024
Dim localFilePath As String = "qa_data/zips/big.zip"
' Upload the file big.zip in 320KiB segments.
' Note: The FileSize method returns a signed 32-bit integer. If the file is potentially larger than 2GB, call FileSizeStr instead to return
' the size of the file as a string, then convert to an integer value.
Dim fac As ChilkatFileAccess
fac.Initialize
Dim fileSize As Int = fac.FileSize(localFilePath)
' Open the file to get the number of fragments.
success = fac.OpenForRead(localFilePath)
If success = False Then
Log(fac.LastErrorText)
Return
End If
Dim numFragments As Int = fac.GetNumBlocks(fragSize)
fac.FileClose
Dim i As Int = 0
Log("fileSize = " & fileSize)
Log("numFragments = " & numFragments)
Dim uploadUrl As ChilkatUrl
uploadUrl.Initialize
uploadUrl.ParseUrl(jsonSession.StringOf("uploadUrl"))
json.EmitCompact = False
Dim req As ChilkatHttpRequest
req.Initialize
req.HttpVerb = "PUT"
req.Path = uploadUrl.PathWithQueryParams
req.ContentType = "application/octet-stream"
Dim sbOffset As ChilkatStringBuilder
sbOffset.Initialize
Dim sbNumBytes As ChilkatStringBuilder
sbNumBytes.Initialize
Dim sbRange As ChilkatStringBuilder
sbRange.Initialize
' 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 Int = fileSize
Do 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 Int = fragSize
Dim expectedStatusCode As Int = 202
If bytesRemaining < chunkSize Then
chunkSize = bytesRemaining
expectedStatusCode = 201
End If
Log(" 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 Int = sbRange.ReplaceI("start", i * fragSize)
numReplaced = sbRange.ReplaceI("end", i * fragSize + chunkSize - 1)
numReplaced = sbRange.ReplaceI("fileSize", fileSize)
req.AddHeader("Content-Range", sbRange.GetAsString)
Log(" this content-range: " & sbRange.GetAsString)
Dim domain As String = uploadUrl.Host
success = http.HttpSReq(domain, 443, True, req, resp)
If success = False Then
Log(http.LastErrorText)
Return
End If
json.Load(resp.BodyStr)
' A 202 response status code indicates success.
If resp.StatusCode <> expectedStatusCode Then
Log(json.Emit)
Log("Response status = " & resp.StatusCode)
Return
End If
Log(json.Emit)
Log("---- Chunk " & i & " uploaded ----")
bytesRemaining = bytesRemaining - chunkSize
i = i + 1
Loop
Log("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