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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace aiplacement_editor\external;
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use aiplacement_editor\utils;
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use core_external\external_api;
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use core_external\external_function_parameters;
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use core_external\external_value;
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/**
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* External API to call an action for this placement.
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*
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* @package aiplacement_editor
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* @copyright 2024 Matt Porritt <matt.porritt@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class generate_image extends external_api {
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/**
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* Generate image parameters.
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*
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* @return external_function_parameters
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* @since Moodle 4.5
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*/
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public static function execute_parameters(): external_function_parameters {
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return new external_function_parameters([
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'contextid' => new external_value(
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PARAM_INT,
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'The context ID',
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VALUE_REQUIRED,
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),
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'prompttext' => new external_value(
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PARAM_RAW,
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'The prompt text for the AI service',
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VALUE_REQUIRED,
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),
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'aspectratio' => new external_value(
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PARAM_ALPHA,
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'The aspect ratio of the image',
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VALUE_REQUIRED,
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),
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'quality' => new external_value(
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PARAM_ALPHA,
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'The quality of the image',
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VALUE_REQUIRED,
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),
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'numimages' => new external_value(
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PARAM_INT,
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'The number of images to generate',
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VALUE_DEFAULT,
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1,
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),
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'style' => new external_value(
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PARAM_ALPHA,
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'The style of the image',
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VALUE_DEFAULT,
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'natural',
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),
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]);
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}
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/**
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* Generate image from the AI placement.
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*
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* @param int $contextid The context ID.
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* @param string $prompttext The data encoded as a json array.
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* @param string $aspectratio The aspect ratio of the image.
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* @param string $quality The quality of the image.
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* @param string $numimages The number of images to generate.
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* @param string $style The style of the image.
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* @return array The generated content.
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* @since Moodle 4.5
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*/
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public static function execute(
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int $contextid,
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string $prompttext,
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string $aspectratio,
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string $quality,
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string $numimages,
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string $style = '',
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): array {
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global $USER;
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// Parameter validation.
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[
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'contextid' => $contextid,
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'prompttext' => $prompttext,
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'aspectratio' => $aspectratio,
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'quality' => $quality,
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'numimages' => $numimages,
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'style' => $style,
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] = self::validate_parameters(self::execute_parameters(), [
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'contextid' => $contextid,
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'prompttext' => $prompttext,
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'aspectratio' => $aspectratio,
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'quality' => $quality,
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'numimages' => $numimages,
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'style' => $style,
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]);
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// Context validation and permission check.
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// Get the context from the passed in ID.
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$context = \context::instance_by_id($contextid);
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// Check the user has permission to use the AI service.
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self::validate_context($context);
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if (!utils::is_html_editor_placement_action_available($context, 'generate_text',
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\core_ai\aiactions\generate_image::class)) {
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throw new \moodle_exception('noeditor', 'aiplacement_editor');
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}
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// Prepare the action.
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$action = new \core_ai\aiactions\generate_image(
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contextid: $contextid,
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userid: $USER->id,
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prompttext: $prompttext,
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quality: $quality,
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aspectratio: $aspectratio,
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numimages: $numimages,
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style: $style,
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);
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// Send the action to the AI manager.
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$manager = \core\di::get(\core_ai\manager::class);
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$response = $manager->process_action($action);
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// If we have a successful response, generate the URL for the draft file.
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if ($response->get_success()) {
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$draftfile = $response->get_response_data()['draftfile'];
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$drafturl = \moodle_url::make_draftfile_url(
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$draftfile->get_itemid(),
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$draftfile->get_filepath(),
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$draftfile->get_filename(),
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false,
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)->out(false);
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} else {
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$drafturl = '';
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}
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// Return the response.
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return [
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'success' => $response->get_success(),
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'revisedprompt' => $response->get_response_data()['revisedprompt'] ?? '',
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'drafturl' => $drafturl,
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'errorcode' => $response->get_errorcode(),
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'error' => $response->get_errormessage(),
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];
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}
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/**
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* Generate content return value.
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*
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* @return external_function_parameters
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* @since Moodle 4.5
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*/
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public static function execute_returns(): external_function_parameters {
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return new external_function_parameters([
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'success' => new external_value(
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PARAM_BOOL,
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'Was the request successful',
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VALUE_REQUIRED,
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),
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'revisedprompt' => new external_value(
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PARAM_TEXT,
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'Revised prompt generated by the AI',
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VALUE_DEFAULT,
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'',
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),
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'drafturl' => new external_value(
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PARAM_URL,
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'Draft file URL for the image',
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VALUE_DEFAULT,
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'',
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),
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'errorcode' => new external_value(
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PARAM_INT,
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'Error code if any',
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VALUE_DEFAULT,
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0,
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),
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'error' => new external_value(
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PARAM_TEXT,
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'Error message if any',
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VALUE_DEFAULT,
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'',
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),
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]);
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}
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}
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