(Tcl) curl with OAuth2 Client Credentials

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This example shows how to run a simple CURL command with an OAuth2 access token for authorization. We use CURL to retrieve a SharePoint site ID, and Chilkat automatically fetches the OAuth2 access token using the provided credentials.

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

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load ./chilkat.dll

set success 0

# This example will run the following curl command

# curl -X GET "https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}" \
#   -H "Authorization: Bearer ACCESS_TOKEN" \
#   -H "Accept: application/json"

set sb [new_CkStringBuilder]

CkStringBuilder_AppendLn $sb "curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}\" \\"
CkStringBuilder_AppendLn $sb "  -H \"Authorization: Bearer ACCESS_TOKEN\" \\"
CkStringBuilder_AppendLn $sb "  -H \"Accept: application/json\""

# Build the JSON that provides information for getting the OAuth2 access token using the OAuth2 client credentials flow.
set jsonOAuth2 [new_CkJsonObject]

CkJsonObject_UpdateString $jsonOAuth2 "oauth2.client_id" "CLIENT_ID"
CkJsonObject_UpdateString $jsonOAuth2 "oauth2.client_secret" "CLIENT_SECRET"
CkJsonObject_UpdateString $jsonOAuth2 "oauth2.scope" "https://graph.microsoft.com/.default"
CkJsonObject_UpdateString $jsonOAuth2 "oauth2.token_endpoint" "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token"

set httpCurl [new_CkHttpCurl]

# Provide the information for getting the OAuth2 access token from the token endpoint
# Note: The Authorization header specified in the curl command will be ignored and replaced using the OAuth2 access token obtained at runtime from the token endpoint.
CkHttpCurl_SetAuth $httpCurl $jsonOAuth2

# The placeholders {{sharepoint_hostname}} and {{site_name}} represent variables that must be defined before execution.
# When DoYourThing runs the curl command, it automatically substitutes these placeholders with their corresponding values.
# Below are the values assigned to these variables:
CkHttpCurl_SetVar $httpCurl "sharepoint_hostname" "example.sharepoint.com"
CkHttpCurl_SetVar $httpCurl "site_name" "test"

# Run the curl command.
set success [CkHttpCurl_DoYourThing $httpCurl [CkStringBuilder_getAsString $sb]]
if {$success == 0} then {
    puts [CkHttpCurl_lastErrorText $httpCurl]
    delete_CkStringBuilder $sb
    delete_CkJsonObject $jsonOAuth2
    delete_CkHttpCurl $httpCurl
    exit
}

set responseJson [new_CkJsonObject]

CkJsonObject_put_EmitCompact $responseJson 0

CkHttpCurl_GetResponseJson $httpCurl $responseJson

set statusCode [CkHttpCurl_get_StatusCode $httpCurl]
puts "response status code: $statusCode"

puts [CkJsonObject_emit $responseJson]

delete_CkStringBuilder $sb
delete_CkJsonObject $jsonOAuth2
delete_CkHttpCurl $httpCurl
delete_CkJsonObject $responseJson