(Tcl) SharePoint List Document Libraries

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This example shows how to use Chilkat's HttpCurl class to list the document libraries in a SharePoint site. In Microsoft Graph, SharePoint document libraries are represented as drives. The example demonstrates how HttpCurl can automatically resolve a SharePoint site name to its Microsoft Graph site ID, then use that ID to retrieve and display the site's document libraries.

Note: This example requires Chilkat v11.5.0 or greater.

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load ./chilkat.dll

set success 0

# This example retrieves the document libraries for a SharePoint site.
# 
# In Microsoft Graph terminology, a document library is represented as a "drive".
# The example demonstrates how HttpCurl can automatically resolve a SharePoint
# site name to a site ID before requesting the site's document libraries.

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 variables whose values are already known.
# 
# These variables are referenced in the curl command using
# {{variable_name}} substitution syntax.
CkHttpCurl_SetVar $curl "sharepoint_hostname" "example.sharepoint.com"
CkHttpCurl_SetVar $curl "site_name" "test"

# The document libraries endpoint requires a Microsoft Graph site ID.
# 
# Because the application only knows the SharePoint site name,
# HttpCurl must first retrieve the corresponding site ID.
# 
# Define a function that can resolve the site_id variable when needed.
# HttpCurl may execute this function automatically if it determines that
# site_id is required by another request.
CkHttpCurl_AddFunction $curl "getSite" "GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}"

# Extract the "id" field from the getSite response and store it
# in the HttpCurl variable named "site_id".
# 
# Any later request that references {{site_id}} can use this value.
CkHttpCurl_AddOutput $curl "getSite" "id" "site_id"

# The target Microsoft Graph request:
# 
# curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives
# 
# This request returns the document libraries belonging to the site.
# 
# Microsoft Graph refers to document libraries as "drives",
# so each object in the response represents one document library.
# 
# No Authorization header is included because HttpCurl automatically
# adds it when OAuth2 authentication is configured.
set curlCommand "curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives\""

# Execute the request.
# 
# HttpCurl examines the target curl command and determines that
# the variable {{site_id}} is required.
# 
# Because site_id is not yet known, HttpCurl searches for a function
# capable of producing it.  The getSite function provides the "id"
# output, which is mapped to the site_id variable.
# 
# The execution plan becomes:
# 
#   1) Execute getSite to obtain site_id.
#   2) Substitute {{site_id}} into the target request.
#   3) Execute the drives request.
# 
# The final HTTP response returned by DoYourThing is always the
# response from the target curl command, which is the last step in the plan.
set success [CkHttpCurl_DoYourThing $curl $curlCommand]
if {$success == 0} then {
    puts [CkHttpCurl_lastErrorText $curl]
    delete_CkJsonObject $jsonAuth
    delete_CkHttpCurl $curl
    exit
}

# A successful Graph response should return HTTP 200.
# Any other status code typically indicates an authentication,
# permission, or resource lookup error.
set statusCode [CkHttpCurl_get_StatusCode $curl]
if {$statusCode != 200} then {
    puts [CkHttpCurl_responseBodyStr $curl]
    puts "status code = $statusCode"
    delete_CkJsonObject $jsonAuth
    delete_CkHttpCurl $curl
    exit
}

# The response body contains a JSON array named "value".
# Each element of the array describes a SharePoint document library.
set json [new_CkJsonObject]

CkJsonObject_put_EmitCompact $json 0
CkHttpCurl_GetResponseJson $curl $json
puts [CkJsonObject_emit $json]

# Iterate over the document libraries returned by Microsoft Graph
# and display selected properties for each library.
set i 0
set numDrives [CkJsonObject_SizeOfArray $json "value"]
while {$i < $numDrives} {
    CkJsonObject_put_I $json $i
    puts "name: [CkJsonObject_stringOf $json {value[i].name}]"
    puts "description: [CkJsonObject_stringOf $json {value[i].description}]"
    puts "id: [CkJsonObject_stringOf $json {value[i].id}]"
    puts "webUrl: [CkJsonObject_stringOf $json {value[i].webUrl}]"
    puts "displayName: [CkJsonObject_stringOf $json {value[i].createdBy.user.displayName}]"
    puts "-"
    set i [expr $i + 1]
}

puts "Success."

delete_CkJsonObject $jsonAuth
delete_CkHttpCurl $curl
delete_CkJsonObject $json