(Tcl) 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.

For more information, see https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins/working-with-folders-and-files-with-rest

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load ./chilkat.dll

set success 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.

set success 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.
set jsonAuth [new_CkJsonObject]

# 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
CkJsonObject_put_EnableSecrets $jsonAuth 1

set success [CkJsonObject_UpdateString $jsonAuth "oauth2.client_id" "!!sharepoint|oauth2|client_id"]
if {$success == 1} then {
    set success [CkJsonObject_UpdateString $jsonAuth "oauth2.client_secret" "!!sharepoint|oauth2|client_secret"]
}

if {$success == 1} then {
    set success [CkJsonObject_UpdateString $jsonAuth "oauth2.token_endpoint" "!!sharepoint|oauth2|token_endpoint"]
}

if {$success == 0} then {
    puts [CkJsonObject_lastErrorText $jsonAuth]
    delete_CkJsonObject $jsonAuth
    exit
}

# Request Microsoft Graph permissions that were granted to the application.
CkJsonObject_UpdateString $jsonAuth "oauth2.scope" "https://graph.microsoft.com/.default"

# ---------------------------------------------------------------------------------------------------

set curl [new_CkHttpCurl]

# 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.
CkHttpCurl_SetAuth $curl $jsonAuth

# Define values that are already known.
# 
# These variables are referenced in curl commands using
# {{variable_name}} substitution syntax.
CkHttpCurl_SetVar $curl "sharepoint_hostname" "example.sharepoint.com"
CkHttpCurl_SetVar $curl "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.
CkHttpCurl_AddFunction $curl "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.
CkHttpCurl_AddOutput $curl "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".
CkHttpCurl_AddFunction $curl "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.
CkHttpCurl_AddOutput2 $curl "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.
set 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.
set success [CkHttpCurl_DoYourThing $curl $curlCommand]
if {$success == 0} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkJsonObject $jsonAuth
    delete_CkHttpCurl $curl
    exit
}

# 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.
set statusCode [CkHttpCurl_get_StatusCode $curl]
if {expr [$statusCode != 201]  &&  [$statusCode != 200]} then {
    puts [CkHttpCurl_responseBodyStr $curl]
    puts "status code = $statusCode"
    delete_CkJsonObject $jsonAuth
    delete_CkHttpCurl $curl
    exit
}

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

delete_CkJsonObject $jsonAuth
delete_CkHttpCurl $curl