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/**
* License: Public domain.
*
* Description: This snippet integrates the OIDC connect button with WooCommerce
* to allow importing the customer's shopping details via OIDC.
* Author Christian Grothoff <grothoff@taler.net>
*/
// Add OIDC login form to checkout page.
add_action(
'openid-connect-generic-register-login-form',
function ( $login_form ) {
// If WooCommerce is inactive, do nothing.
if ( ! in_array(
'woocommerce/woocommerce.php',
apply_filters(
'active_plugins',
get_option( 'active_plugins' )
),
true
) ) {
return;
}
// Show login form at the shopping cart (if not logged in).
add_action(
'woocommerce_before_checkout_billing_form',
function ( $checkout ) use ( $login_form ) {
$user = wp_get_current_user();
if ( 0 === $user->ID ) {
// ID 0 is used to indicate user is not logged in.
// Re-use filter logic to generate login page.
print ( $login_form->handle_login_page( '' ) );
}
}
);
// Add action to set cookie to redirect back to current
// (checkout) page after OIDC provided the data.
add_action(
'woocommerce_before_checkout_billing_form',
function ( $checkout ) use ( $login_form ) {
$login_form->handle_redirect_cookie ( );
}
);
}
);
// Hook to convert OIDC fields to WC checkout fields if logged in.
add_filter(
'woocommerce_checkout_fields',
'filter_checkout_get_value'
);
/**
* Checks if $claimname is in the body or _claim_names of the userinfo.
* If yes, returns the claim value. Otherwise, returns false.
*
* @param string $claimname the claim name to look for
* @param array $userinfo the JSON to look in
* @param string $claimvalue the source claim value ( from the body of the JWT of the claim source)
* @return True if a reference was found
*/
function get_claim( $claimname, $userinfo, &$claimvalue ) {
if ( ! isset( $token_response ) ) {
return False;
}
/**
* If we find a simple claim, return it.
*/
if ( array_keys_exists( $claimname, $token_response ) ) {
$claimvalue = $token_response[$claimname];
return True;
}
/**
* If there are not aggregated claims, it is over.
*/
if ( ! array_key_exists( '_claim_names', $token_response ) ||
! array_key_exists( '_claim_sources', $token_response ) ) {
return False;
}
$claim_src_ptr = $token_response['_claim_names'];
if ( ! isset( $claim_src_ptr ) ) {
return False;
}
/**
* No reference found
*/
if ( ! array_key_exists( $claimname, $claim_src_ptr ) ) {
return False;
}
$src = $claim_src_ptr[$claimname];
//Reference found, but no corresponding JWT. This is a malformed userinfo
if ( ! array_key_exists( $src, $token_response['_claim_sources']) ) {
return False;
}
//Source claim is not a JWT. Abort.
if ( ! array_key_exists( 'JWT', $src ) ) {
return False;
}
/**
* Extract claim from JWT.
* FIXME: We probably want to verify the JWT signature/issuer here!
*/
$jwt = $src['JWT'];
list ($header, $body, $rest) = split('.', $jwt, 3);
$body_decoded = base64_decode ( $body, false );
if ( ( isset ( $body_decoded ) ) &&
( array_key_exists( $claimname, $body_decoded ) ) ) {
$claimvalue = $body_decoded[$claimname];
return True;
}
return False;
}
/**
* Filter to transform (defaults) for the Billing details according to
* the information obtained from OpenID Connect (OIDC). WooCommerce
* already grabs many of the values properly, but there are some fields
* which we have to convert manually.
*
* @param array $in Data structure with shipping details to extend and return.
*
* @return array Enhanced shipping details.
*/
function filter_checkout_get_value( $in = array() ) {
$user = wp_get_current_user();
if ( 0 !== $user->ID ) {
$token_response = $user->get( 'openid-connect-generic-last-user-claim' );
$src = '';
if ( get_claim( 'given_name', $token_response, $given_name ) ) {
$in['billing']['billing_first_name']['default'] = $given_name;
$in['shipping']['shipping_first_name']['default'] = $given_name;
}
if ( get_claim( 'family_name', $token_response, $family_name ) ) {
$in['billing']['billing_last_name']['default'] = $family_name;
$in['shipping']['shipping_last_name']['default'] = $family_name;
}
if ( get_claim( 'phone_number', $token_response, $phone_number ) ) {
$in['billing']['billing_phone']['default'] = $phone_number;
$in['shipping']['shipping_phone']['default'] = $phone_number;
}
if ( get_claim( 'address', $token_response, $address ) ) {
if ( array_key_exists( 'postal_code', $address ) ) {
$postal_code = $address ['postal_code'];
$in['billing']['billing_postcode']['default'] = $postal_code;
$in['shipping']['shipping_postcode']['default'] = $postal_code;
}
if ( array_key_exists( 'country', $address ) ) {
$country = $address ['country'];
$in['billing']['billing_country']['default'] = $country;
$in['shipping']['shipping_country']['default'] = $country;
}
if ( array_key_exists( 'locality', $address ) ) {
$locality = $address ['locality'];
$in['billing']['billing_city']['default'] = $locality;
$in['shipping']['shipping_city']['default'] = $locality;
}
if ( array_key_exists( 'region', $address ) ) {
$region = $address ['region'];
$in['billing']['billing_state']['default'] = $region;
$in['shipping']['shipping_state']['default'] = $region;
}
if ( array_key_exists( 'formatted', $address ) ) {
$formatted = $address ['formatted'];
$lines = explode( '\r\n', $formatted );
if ( count( $lines ) > 0 ) {
$in['billing']['billing_address_1']['default'] = $lines[0];
$in['shipping']['shipping_address_1']['default'] = $lines[0];
}
if ( count( $lines ) > 1 ) {
$in['billing']['billing_address_2']['default'] = $lines[1];
$in['shipping']['shipping_address_2']['default'] = $lines[1];
}
}
if ( array_key_exists( 'street_address', $address ) ) {
$street_address = $address ['street_address'];
if ( ! array_key_exists( 'formatted', $address ) ) {
$in['billing']['billing_address_1']['default'] = $street_address;
$in['shipping']['shipping_address_1']['default'] = $street_address;
}
}
}
}
return $in;
}
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