utils.php

<?php

function social_connect_get_user_by_meta( $meta_key, $meta_value ) {
	global $wpdb;

	$sql = "SELECT user_id FROM $wpdb->usermeta WHERE meta_key = '%s' AND meta_value = '%s'";
	return $wpdb->get_var( $wpdb->prepare( $sql, $meta_key, $meta_value ) );
}

function social_connect_generate_signature( $data ) {
	return hash( 'SHA256', AUTH_KEY . $data );
}

function social_connect_verify_signature( $data, $signature, $redirect_to ) {
	$generated_signature = social_connect_generate_signature( $data );

	if( $generated_signature != $signature ) {
		wp_safe_redirect( $redirect_to );
		exit();
	}
}

function sc_http_get_contents( $url ) {
	$response = wp_remote_get( $url );

	if ( is_wp_error( $response ) ) {
		die( sprintf( __( 'Something went wrong: %s', 'social-connect' ), $response->get_error_message() ) );
	} else {
		return $response['body'];
	}
}