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Upload a File to a SharePoint Documents Library using HttpCurl

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This example shows how to use Chilkat's HttpCurl class to upload a local file to the root of a SharePoint Documents document library. The example uses Microsoft Graph to automatically resolve the SharePoint site name to a site ID, find the drive ID for the Documents library, and then upload helloChilkat.txt so it is stored in SharePoint as example.txt. A successful upload returns 201 Created when a new file is created, or 200 OK when an existing file is updated or replaced.

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Dim success As Boolean
success = False

// This example uploads a local file to the root of a SharePoint
// Documents document library.
// 
// The local file:
// 
//   qa_data/helloChilkat.txt
// 
// is uploaded and stored in SharePoint as:
// 
//   example.txt
// 
// The example demonstrates how HttpCurl automatically resolves:
// 
//   site_name  -> site_id
//   site_id    -> document_library_id
// 
// and then uploads the file to the target document library using
// the Microsoft Graph file upload API.

success = False

// --------------------------------------------------------------------------------------------------------
// Before running this example, create an Azure App Registration and grant it
// the Microsoft Graph permissions required to access SharePoint.
// 
// The application will authenticate using OAuth2 Client Credentials.
// See:
// How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
// --------------------------------------------------------------------------------------------------------

// Build a JSON authentication configuration.
// HttpCurl will use this information to automatically obtain OAuth2 access tokens.
Dim jsonAuth As New Chilkat.JsonObject

// Enable secret lookup.
// 
// Instead of hard-coding sensitive values such as the client ID,
// client secret, and token endpoint, secret specification strings
// are used.  Chilkat automatically retrieves the actual values from
// Windows Credential Manager (Windows) or Apple Keychain (macOS).
// 
// See:
// Secret Specification Strings
jsonAuth.EnableSecrets = True

success = jsonAuth.UpdateString("oauth2.client_id","!!sharepoint|oauth2|client_id")
If (success = True) Then
    success = jsonAuth.UpdateString("oauth2.client_secret","!!sharepoint|oauth2|client_secret")
End If

If (success = True) Then
    success = jsonAuth.UpdateString("oauth2.token_endpoint","!!sharepoint|oauth2|token_endpoint")
End If

If (success = False) Then
    System.DebugLog(jsonAuth.LastErrorText)
    Return
End If

// Request Microsoft Graph permissions that were granted to the application.
success = jsonAuth.UpdateString("oauth2.scope","https://graph.microsoft.com/.default")

// ---------------------------------------------------------------------------------------------------

Dim curl As New Chilkat.HttpCurl

// Associate the OAuth2 configuration with HttpCurl.
// 
// When the request is executed, Chilkat automatically obtains an access token
// if needed and adds the Authorization: Bearer header to the HTTP request.
success = curl.SetAuth(jsonAuth)

// Define values that are already known.
// 
// These variables are referenced in curl commands using
// {{variable_name}} substitution syntax.
curl.SetVar "sharepoint_hostname","example.sharepoint.com"
curl.SetVar "site_name","test"

// The upload request requires a Microsoft Graph site ID.
// 
// Because the application only knows the SharePoint site name,
// define a helper function that can retrieve the site information.
success = curl.AddFunction("getSite","GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}")

// Extract the site's ID and store it in the HttpCurl variable named site_id.
success = curl.AddOutput("getSite","id","site_id")

// The upload request also requires the drive ID of the Documents
// document library.
// 
// Microsoft Graph refers to document libraries as "drives".
success = curl.AddFunction("getDrives","GET https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives")

// Search the returned drives for the one named "Documents"
// and save its drive ID in the document_library_id variable.
success = curl.AddOutput2("getDrives","value","name","Documents",True,"id","document_library_id")

// This is the target Microsoft Graph request.
// 
// PUT /drives/{drive-id}/root:/{filename}:/content
// 
// This endpoint uploads a file to a document library.  If the target
// file already exists, Microsoft Graph replaces the existing content.
// If the file does not exist, a new file is created.
// 
// The --data-binary option uploads the contents of the local file
// exactly as stored on disk.
// 
// The uploaded file will be named "example.txt" in the root of the
// Documents document library.
Dim curlCommand As String
curlCommand = "curl -X PUT -H ""Content-Type: text/plain; charset=utf-8"" --data-binary @qa_data/helloChilkat.txt ""https://graph.microsoft.com/v1.0/drives/{{document_library_id}}/root:/example.txt:/content"""

// Execute the request.
// 
// HttpCurl examines the target request and determines that
// document_library_id is required.
// 
// To obtain this value, it automatically builds and executes
// the following dependency chain:
// 
//   1) getSite    -> site_id
//   2) getDrives  -> document_library_id
//   3) upload     -> example.txt
// 
// The final response returned by DoYourThing is the response
// from the upload request.
success = curl.DoYourThing(curlCommand)
If (success = False) Then
    System.DebugLog(curl.LastErrorText)
    Return
End If

// A successful upload can return:
// 
//   201 (Created)
//       A new file was created.
// 
//   200 (OK)
//       An existing file was updated or replaced.
// 
// Any other status code typically indicates an authentication,
// permission, site lookup, document library lookup, or upload error.
Dim statusCode As Int32
statusCode = curl.StatusCode
If ((statusCode <> 201) And (statusCode <> 200)) Then
    System.DebugLog(curl.ResponseBodyStr)
    System.DebugLog("status code = " + Str(statusCode))
    Return
End If

// The file has been uploaded successfully and is now available
// in the root of the Documents document library as:
// 
//   example.txt
// 
System.DebugLog("Success.")