(Swift 2) OneDrive -- Upload Large Files with an Upload Session

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

Note: This example requires Chilkat v9.5.0.97 or greater.

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success: Bool

    // 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
    let json = CkoJsonObject()
    json.UpdateString("client_id", value: "2871da2c-8176-4b7f-869b-2311aa82e743")
    json.UpdateString("client_secret", value: "2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH")
    json.UpdateString("scope", value: "https://graph.microsoft.com/.default")
    json.UpdateString("token_endpoint", value: "https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token")

    let http = CkoHttp()
    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", value: "/somefolder/big.zip")
    http.SetUrlVar("user_id", value: "4fe732c3-322e-4a6b-b729-2fd1eb5c6104")
    var url: String? = "https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:/{$path_to_item}:/createUploadSession"
    var resp: CkoHttpResponse? = http.PostJson2(url, contentType: "application/json", jsonText: "{}")
    if http.LastMethodSuccess != true {
        print("\(http.LastErrorText)")
        return
    }

    // If successful, a 200 status code is returned, with the session details (in JSON format).
    let jsonSession = CkoJsonObject()
    jsonSession.EmitCompact = false
    jsonSession.Load(resp!.BodyStr)

    if resp!.StatusCode.intValue != 200 {

        print("\(jsonSession.Emit())")
        print("Response status = \(resp!.StatusCode.intValue)")
        resp = nil
        return
    }

    resp = nil

    print("\(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.)

    var fragSize: Int = 320 * 1024
    var localFilePath: 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.
    let fac = CkoFileAccess()
    var fileSize: Int = fac.FileSize(localFilePath).intValue

    // Open the file to get the number of fragments.
    success = fac.OpenForRead(localFilePath)
    if success == false {
        print("\(fac.LastErrorText)")
        return
    }

    var numFragments: Int = fac.GetNumBlocks(fragSize).intValue
    fac.FileClose()

    var i: Int = 0

    print("fileSize = \(fileSize)")
    print("numFragments = \(numFragments)")

    let uploadUrl = CkoUrl()
    uploadUrl.ParseUrl(jsonSession.StringOf("uploadUrl"))

    json.EmitCompact = false

    let req = CkoHttpRequest()
    req.HttpVerb = "PUT"
    req.Path = uploadUrl.PathWithQueryParams
    req.ContentType = "application/octet-stream"

    let sbOffset = CkoStringBuilder()
    let sbNumBytes = CkoStringBuilder()
    let sbRange = CkoStringBuilder()

    // 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 = ""

    var bytesRemaining: Int = 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.
        var chunkSize: Int = fragSize
        var expectedStatusCode: Int = 202
        if bytesRemaining < chunkSize {
            chunkSize = bytesRemaining
            expectedStatusCode = 201
        }

        print("  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, offset: sbOffset.GetAsString(), numBytes: 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")
        var numReplaced: Int = sbRange.ReplaceI("start", replacement: i * fragSize).intValue
        numReplaced = sbRange.ReplaceI("end", replacement: i * fragSize + chunkSize - 1).intValue
        numReplaced = sbRange.ReplaceI("fileSize", replacement: fileSize).intValue
        req.AddHeader("Content-Range", value: sbRange.GetAsString())
        print("  this content-range: \(sbRange.GetAsString())")

        resp = http.SynchronousRequest(uploadUrl.Host, port: 443, ssl: true, req: req)
        if http.LastMethodSuccess != true {
            print("\(http.LastErrorText)")
            return
        }

        json.Load(resp!.BodyStr)
        // A 202 response status code indicates success.
        if resp!.StatusCode.intValue != expectedStatusCode {

            print("\(json.Emit())")
            print("Response status = \(resp!.StatusCode.intValue)")
            resp = nil
            return
        }

        resp = nil
        print("\(json.Emit())")
        print("---- Chunk \(i) uploaded ----")

        bytesRemaining = bytesRemaining - chunkSize
        i = i + 1
    }

    print("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

}