Xbase++
Upload a File to a SharePoint Documents Library using HttpCurl

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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LOCAL nSuccess
LOCAL oJsonAuth
LOCAL oCurl
LOCAL cCurlCommand
LOCAL nStatusCode

nSuccess := 0

//  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.

nSuccess := 0

//  --------------------------------------------------------------------------------------------------------
//  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.
oJsonAuth := CreateObject("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
oJsonAuth:EnableSecrets := 1

nSuccess := oJsonAuth:UpdateString("oauth2.client_id", "!!sharepoint|oauth2|client_id")
IF (nSuccess == 1)
    nSuccess := oJsonAuth:UpdateString("oauth2.client_secret", "!!sharepoint|oauth2|client_secret")
ENDIF

IF (nSuccess == 1)
    nSuccess := oJsonAuth:UpdateString("oauth2.token_endpoint", "!!sharepoint|oauth2|token_endpoint")
ENDIF

IF (nSuccess == 0)
    ? oJsonAuth:LastErrorText
    oJsonAuth:destroy()
    RETURN
ENDIF

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

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

oCurl := CreateObject("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.
oCurl:SetAuth(oJsonAuth)

//  Define values that are already known.
//  
//  These variables are referenced in curl commands using
//  {{variable_name}} substitution syntax.
oCurl:SetVar("sharepoint_hostname", "example.sharepoint.com")
oCurl: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.
oCurl: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.
oCurl: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".
oCurl: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.
oCurl:AddOutput2("getDrives", "value", "name", "Documents", 1, "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.
cCurlCommand := '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.
nSuccess := oCurl:DoYourThing(cCurlCommand)
IF (nSuccess == 0)
    ? oCurl:LastErrorText
    oJsonAuth:destroy()
    oCurl:destroy()
    RETURN
ENDIF

//  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.
nStatusCode := oCurl:StatusCode
IF ((nStatusCode != 201) .AND. (nStatusCode != 200))
    ? oCurl:ResponseBodyStr
    ? "status code = " + Str(nStatusCode)
    oJsonAuth:destroy()
    oCurl:destroy()
    RETURN
ENDIF

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

oJsonAuth:destroy()
oCurl:destroy()