moodle_local_treestudyplan/classes/courseservice.php

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<?php
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// This file is part of the Studyplan plugin for Moodle
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <https://www.gnu.org/licenses/>.
/**
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* Webservice related to courses
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* @package local_treestudyplan
* @copyright 2023 P.M. Kuipers
* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace local_treestudyplan;
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defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir.'/externallib.php');
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use local_treestudyplan\courseinfo;
use local_treestudyplan\associationservice;
use local_treestudyplan\local\helpers\webservicehelper;
use local_treestudyplan\completionscanner;
use local_treestudyplan\gradingscanner;
use local_treestudyplan\debug;
use core_course_category;
use moodle_exception;
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/**
* Webservice related to courses
*/
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class courseservice extends \external_api {
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/**
* Capability required to edit study plans
* @var string
*/
const CAP_EDIT = "local/treestudyplan:editstudyplan";
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/**
* Capability required to view studyplans (for other users)
* @var string
*/
const CAP_VIEW = "local/treestudyplan:viewuserreports";
/**
* Get the topmost categories for the specicied user.
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* Most of the work is offloaded to an SQL query in the interest of speed,
* but moodle functions are used to double check access permissions.
* @param int $userid Id of the user
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* @return array of core_course_category
*/
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public static function user_tops($userid=null, $capability='moodle/category:viewcourselist') {
global $DB, $USER;
if ($userid == null) {
$userid = $USER->id;
}
$tops = [];
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if (has_capability($capability, \context_system::instance(), $userid)) {
if ($capability == 'moodle/category:viewcourselist') {
// We are now just looking for the visible main level categories.
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// Add all categories of depth = 1.
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$rs = $DB->get_recordset("course_categories", ["depth" => 1], 'sortorder');
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foreach ($rs as $rcat) {
// Get the category, and double check if the category is visible to the current user.
// Just in case it is a hidden category and the user does not have the viewhidden permission.
$cat = \core_course_category::get($rcat->id, \IGNORE_MISSING, false, $userid);
if ($cat !== null) {
// Register the category.
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array_push($tops, $cat);
}
}
$rs->close();
} else {
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// Context is system, but system may not be visible.
// Return the top visible categories for this user.
// Recurses only once.
return self::user_tops($userid);
}
} else {
// We need to search for the permissions on an individial context level.
// This part finds all top categories with a certain permission that are also visible for the user.
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$sql = "SELECT UNIQUE ctx.* FROM {context} ctx
INNER JOIN {role_assignments} ra ON ra.contextid = ctx.id
INNER JOIN {role_capabilities} rc ON ra.roleid = rc.roleid
LEFT JOIN {course_categories} cat ON ctx.instanceid = cat.id
WHERE ( ctx.contextlevel = :ctxl_coursecat )
AND ra.userid = :userid AND rc.capability = :capability
ORDER BY ctx.depth ASC, cat.sortorder ASC";
// Use recordset to handle the eventuality of a really big and complex moodle setup.
$recordset = $DB->get_records_sql($sql, ["userid" => $userid, "capability" => $capability,
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"ctxl_coursecat" => \CONTEXT_COURSECAT ]);
$params = ["userid" => $userid, "capability" => $capability,
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"ctxl_coursecat" => \CONTEXT_COURSECAT ];
$contextids = [];
foreach ($recordset as $r) {
// Get the paths as an array.
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$parents = explode("/", $r->path);
// Strip the first item, since it is an empty one.
array_shift($parents);
// Strip the last item, since it refers to self.
array_pop($parents);
// Figure out if any of the remaining parent contexts are already contexts with permission.
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$intersect = array_intersect($contextids, $parents);
if (count($intersect) == 0) {
// Double check permissions according to the moodle capability system.
$ctx = \context::instance_by_id($r->id);
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if (has_capability($capability, $ctx, $userid)) {
// Get the category, and double check if the category is visible to the current user.
// Just in case it is a hidden category and the user does not have the viewhidden permission.
$cat = \core_course_category::get($r->instanceid, \IGNORE_MISSING, false, $userid);
if ($cat !== null) {
// Register the context id in the list now, since we know the category is really visible.
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array_push($contextids, $r->id);
// Register the category.
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array_push($tops, $cat);
} else {
// The category is not visible. Add the first known visible subcategories.
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$children = self::get_first_visible_children($r->id, $userid);
foreach ($children as $cat) {
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array_push($tops, $cat);
}
}
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}
}
}
}
return $tops;
}
/**
* Find the top-most child categories for a given category that are visible.
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*
* @param int $parentid The category to search for
* @return array of \core_course_category
*/
private static function get_first_visible_children($parentid, $userid) {
global $DB;
$capability = 'moodle/category:viewcourselist';
$tops = [];
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$pathlike = $DB->sql_like('ctx.path', ':pathsearch');
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$sql = "SELECT UNIQUE ctx.* FROM {context} ctx
INNER JOIN {role_assignments} ra ON ra.contextid = ctx.id
INNER JOIN {role_capabilities} rc ON ra.roleid = rc.roleid
LEFT JOIN {course_categories} cat ON ctx.instanceid = cat.id
WHERE ( ctx.contextlevel = :ctxl_coursecat )
AND ra.userid = :userid AND rc.capability = :capability
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AND {$pathlike}
ORDER BY ctx.depth ASC, cat.sortorder ASC";
// Use recordset to handle the eventuality of a really big and complex moodle setup.
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$recordset = $DB->get_recordset_sql($sql, ["userid" => $userid,
"capability" => $capability,
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"ctxl_coursecat" => \CONTEXT_COURSECAT,
"pathsearch" => "%/{$parentid}/%",
]);
$contextids = [];
foreach ($recordset as $r) {
// Get the paths as an array.
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$parents = explode("/", $r->path);
// Strip the first item, since it is an empty one.
array_shift($parents);
// Strip the last item, since it refers to self.
array_pop($parents);
// Figure out if any of the remaining parent contexts are already contexts with permission.
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$intersect = array_intersect($contextids, $parents);
if (count($intersect) == 0) {
// Double check permissions according to the moodle capability system.
$ctx = \context::instance_by_id($r->id);
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if (has_capability($capability, $ctx, $userid)) {
// Get the category, and double check if the category is visible to the current user.
// Just in case it is a hidden category and the user does not have the viewhidden permission.
$cat = \core_course_category::get($r->instanceid, \IGNORE_MISSING, false, $userid);
if ($cat !== null) {
// Register the context id in the list now, since we know the category is really visible.
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array_push($contextids, $r->id);
// Register the category.
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array_push($tops, $cat);
}
}
}
}
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$recordset->close();
return $tops;
}
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/**
* Return value description for map_categories function
*/
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public static function map_categories_parameters(): \external_function_parameters {
return new \external_function_parameters( [
"studyplan_id" => new \external_value(PARAM_INT, 'ID of studyplan to map the categories for', VALUE_DEFAULT),
] );
}
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/**
* Parameter description for map_categories function
*/
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public static function map_categories_returns(): \external_description {
return new \external_multiple_structure(static::map_category_structure(false));
}
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/**
* Structure description for category map, used in a number of return descriptions
* @param bool $lazy
* @param int $value
*/
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protected static function map_category_structure($lazy = false, $value = VALUE_REQUIRED) {
$s = [
"id" => new \external_value(PARAM_INT, 'course category id'),
"context_id" => new \external_value(PARAM_INT, 'course category context id'),
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"category" => contextinfo::structure(VALUE_OPTIONAL),
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"haschildren" => new \external_value(PARAM_BOOL, 'true if the category has child categories'),
"hascourses" => new \external_value(PARAM_BOOL, 'true if the category contains courses'),
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"studyplancount" => new \external_value(PARAM_INT, 'number of linked studyplans', VALUE_OPTIONAL),
];
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if (!$lazy > 0) {
$s["courses"] = new \external_multiple_structure( courseinfo::editor_structure() );
$s["children"] = new \external_multiple_structure( static::map_category_structure(true));
}
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return new \external_single_structure($s, "CourseCat info", $value);
}
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/**
* Get a category map, and optionally specify a root category to search for
* User's top category will be used if none specified
* @param int $rootid Optional starting category for the map
* @return array
*/
public static function map_categories($studyplanid = 0) {
global $USER;
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// Determine top categories from provided context.
if ($studyplanid == 0) {
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// On the system level, determine the user's topmost allowed catecories.
// This uses a custom function, since moodle's "core_course_category::user_top()" is somewhat deficient.
$children = self::user_tops();
if (count($children) == 0) {
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throw new moodle_exception("error:nocategoriesvisible", "local_treestudyplan");
}
} else {
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if (\get_config("local_treestudyplan", "limitcourselist")) {
$studyplan = studyplan::find_by_id($studyplanid);
$context = $studyplan->context();
if ($context->contextlevel == \CONTEXT_SYSTEM) {
$children = self::user_tops();
} else if ($context->contextlevel == \CONTEXT_COURSECAT) {
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$cat = \core_course_category::get($context->instanceid, \MUST_EXIST, true);
if ($cat->is_uservisible()) {
$children = [$cat];
} else {
$ci = new contextinfo($context);
$contextname = $ci->pathstr();
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throw new moodle_exception("error:cannotviewcategory", "local_treestudyplan", '', $contextname);
}
} else {
$children = [];
}
} else {
$children = self::user_tops();
if (count($children) == 0) {
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throw new moodle_exception("error:nocategoriesvisible", "local_treestudyplan");
}
}
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}
$list = [];
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foreach ($children as $cat) {
$list[] = static::map_category($cat, false);
}
return $list;
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}
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/**
* Return value description for get_category function
*/
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public static function get_category_parameters(): \external_function_parameters {
return new \external_function_parameters( [
"id" => new \external_value(PARAM_INT, 'id of category'),
] );
}
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/**
* Parameter description for get_category function
*/
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public static function get_category_returns(): \external_description {
return static::map_category_structure(false);
}
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/**
* Get category info by id
* @param mixed $id
* @return array
*/
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public static function get_category($id) {
$cat = \core_course_category::get($id);
return static::map_category($cat);
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}
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/**
* Create a category map, given a specific category
* @param core_course_category $cat The category to scan
* @param bool $lazy If lazy loading, do not scan child categories
* @return array
*/
protected static function map_category(core_course_category $cat, $lazy = false) {
global $DB;
$catcontext = $cat->get_context();
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$ctxinfo = new contextinfo($catcontext);
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$children = $cat->get_children(); // Only shows children visible to the current user.
$courses = $cat->get_courses();
$model = [
"id" => $cat->id,
"context_id" => $catcontext->id,
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"category" => $ctxinfo->model(),
"haschildren" => !empty($children),
"hascourses" => !empty($courses),
];
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if (!$lazy) {
$model["courses"] = [];
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foreach ($courses as $course) {
$courseinfo = new courseinfo($course->id);
$model["courses"][] = $courseinfo->editor_model();
}
$model["children"] = [];
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foreach ($children as $child) {
$model["children"][] = static::map_category($child, true);
}
}
return $model;
}
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/**
* List all user visible categories the current user has a given capability for.
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* @param mixed $capability
* @param core_course_category|null $parent
* @return array
*/
public static function categories_by_capability($capability) {
global $USER;
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// List the categories in which the user has a specific capability.
$list = [];
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$parents = self::user_tops($USER->id, $capability);
array_merge($list, $parents);
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foreach ($parents as $parent) {
// For optimization purposes, we include all its children now, since they will have inherited the permission.
// #PREMATURE_OPTIMIZATION ???.
$list = array_merge($list, self::recursive_child_categories($parent));
}
return $list;
}
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/**
* Recursively create a list of all categories unter a specified parent
* @param core_course_category $parent
* @return core_course_category[]
*/
protected static function recursive_child_categories(core_course_category $parent) {
$list = [];
$children = $parent->get_children();
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foreach ($children as $child) {
$list[] = $child;
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if ($child->get_children_count() > 0) {
$list = array_merge($list, self::recursive_child_categories($child));
}
}
return $list;
}
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/**
* Return value description for list_available_categories function
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*/
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public static function list_available_categories_parameters(): \external_function_parameters {
return new \external_function_parameters( [
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"operation" => new \external_value(PARAM_TEXT, 'type of operation ["view"|"edit"]', VALUE_DEFAULT),
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"refcontext_id" => new \external_value(PARAM_INT, 'id of reference context', VALUE_DEFAULT),
]);
}
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/**
* Parameter description for list_available_categories function
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*/
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public static function list_available_categories_returns(): \external_description {
return new \external_multiple_structure(static::map_category_structure(true));
}
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/**
* List all categories available to the current user for editing or viewing studyplans
* @param string $operation The operation to scan usage for [edit, view]
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* @param int $refctxid Reference context id
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* @return array
*/
public static function list_available_categories($operation = 'edit', $refctxid = 0) {
global $DB;
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if ($operation == "edit") {
$capability = self::CAP_EDIT;
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} else { // Operation == "view" || default.
$capability = self::CAP_VIEW;
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}
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// Get the context ids of all categories the user has access to view and wich have the given permission.
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$contextids = [];
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$tops = self::user_tops(null, $capability);
foreach ($tops as $cat) {
$ctx = \context_coursecat::instance($cat->id);
$contextids[] = $ctx->id;
}
// Now get an overview of the number of study plans in a given context.
$contextcounts = [];
$insertctxs = [];
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$rs = $DB->get_recordset_sql("SELECT DISTINCT context_id, COUNT(*) as num FROM {local_treestudyplan}
GROUP BY context_id");
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foreach ($rs as $r) {
// Build the counts.
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$contextcounts[$r->context_id] = $r->num;
// Add any of the categories containing studyplans to the list.
$ctx = \context::instance_by_id($r->context_id);
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if (has_capability($capability, $ctx) && !in_array($r->context_id, $contextids)) {
$insertctxs[] = $ctx;
}
}
$rs->close();
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$cats = [];
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// If the reference context id is not in the list, push it there if the user has proper permissions in that context.
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if ($refctxid > 1 && !in_array($refctxid, $contextids)) {
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try {
// Get the context.
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$refctx = \context::instance_by_id($refctxid);
// Double check permissions.
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if (has_capability($capability, $refctx)) {
$insertctxs[] = $refctx;
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}
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} catch (\dml_missing_record_exception $x) {
$refctx = null;
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}
}
foreach ($insertctxs as $ictx) {
// Place this context and all relevant direct parents in the correct spots.
$ipath = $ictx->get_parent_context_ids(true);
$found = false;
foreach ($ipath as $i => $pid) {
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$idx = array_search($pid, $contextids);
if ($idx !== false) {
$contextids = array_merge(
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array_slice($contextids, 0, $idx + 1),
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array_reverse(array_slice($ipath, 0, $i)),
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array_slice($contextids, $idx + 1, count($contextids) - 1)
);
$found = true;
break;
}
}
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if (!$found) {
array_unshift($contextids, $ictx->id);
}
}
// Now translate this to the list of categories.
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foreach ($contextids as $ctxid) {
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try {
$ctx = \context::instance_by_id($ctxid);
if ($ctx->contextlevel == CONTEXT_SYSTEM) {
$cat = \core_course_category::top();
} else if ($ctx->contextlevel == CONTEXT_COURSECAT) {
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$cat = \core_course_category::get($ctx->instanceid, \MUST_EXIST, false);
}
$cats[] = $cat;
// In edit mode, also include direct children of the currently selected context.
if ($operation == "edit" && $ctxid == $refctxid) {
// Include direct children for navigation purposes.
foreach ($cat->get_children() as $ccat) {
$ccatctx = \context_coursecat::instance($ccat->id);
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if (!in_array($ccatctx->id, $contextids)) {
$cats[] = $ccat;
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}
}
}
} catch (\dml_missing_record_exception $x) {
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$ctx = null;
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}
}
// And finally build the proper models, including studyplan count in the category context.
$list = [];
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foreach ($cats as $cat) {
$count = 0;
$ctxid = $cat->get_context()->id;
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if (array_key_exists($ctxid, $contextcounts)) {
$count = $contextcounts[$ctxid];
}
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$o = static::map_category($cat, true);
$o["studyplancount"] = $count;
$list[] = $o;
}
return $list;
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}
/**************************************
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*
* Progress scanners for teacherview
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*
**************************************/
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/**
* Return value description for scan_grade_progress function
* @return external_function_parameters
*/
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public static function scan_grade_progress_parameters(): \external_function_parameters {
return new \external_function_parameters( [
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"gradeitemid" => new \external_value(PARAM_INT, 'Grade item ID to scan progress for', VALUE_DEFAULT),
"studyplanid" => new \external_value(PARAM_INT, 'Study plan id to check progress in', VALUE_DEFAULT),
]);
}
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/**
* Parameter description for scan_grade_progress function
*/
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public static function scan_grade_progress_returns(): \external_description {
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return gradingscanner::structure(VALUE_REQUIRED);
}
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/**
* Scan grade item for progress statistics
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* @param mixed $gradeitemid Grade item id
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* @param mixed $studyplanid Id of studyitem the grade is selected in
* @return array
*/
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public static function scan_grade_progress($gradeitemid, $studyplanid) {
global $DB;
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// Verify access to the study plan.
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$o = studyplan::find_by_id($studyplanid);
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webservicehelper::require_capabilities(self::CAP_VIEW, $o->context());
// Retrieve grade item.
$gi = \grade_item::fetch(["id" => $gradeitemid]);
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// Validate course is linked to studyplan.
$courseid = $gi->courseid;
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if (!$o->course_linked($courseid)) {
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throw new \webservice_access_exception(
"Course {$courseid} linked to grade item {$gradeitemid} is not linked to studyplan {$o->id()}"
);
}
$scanner = new gradingscanner($gi);
return $scanner->model();
}
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/**
* Return value description for scan_completion_progress function
*/
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public static function scan_completion_progress_parameters(): \external_function_parameters {
return new \external_function_parameters( [
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"criteriaid" => new \external_value(PARAM_INT, 'CriteriaID to scan progress for', VALUE_DEFAULT),
"studyplanid" => new \external_value(PARAM_INT, 'Study plan id to check progress in', VALUE_DEFAULT),
"courseid" => new \external_value(PARAM_INT, 'Course id of criteria', VALUE_DEFAULT),
]);
}
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/**
* Parameter description for scan_completion_progress function
*/
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public static function scan_completion_progress_returns(): \external_description {
return completionscanner::structure(VALUE_REQUIRED);
}
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/**
* Scan criterium for progress statistics
* @param mixed $criteriaid Id of criterium
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* @param mixed $studyitemid Id of studyplan relevant to this criteria
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* @return array
*/
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public static function scan_completion_progress($criteriaid, $studyitemid) {
global $DB;
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// Verify access to the study plan.
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$item = studyitem::find_by_id($studyitemid);
$o = $item->studyline()->studyplan();
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webservicehelper::require_capabilities(self::CAP_VIEW, $o->context());
$crit = \completion_criteria::fetch(["id" => $criteriaid]);
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$scanner = new completionscanner($crit, $studyitemid);
return $scanner->model();
}
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/**
* Return value description for scan_badge_progress function
*/
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public static function scan_badge_progress_parameters(): \external_function_parameters {
return new \external_function_parameters( [
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"badgeid" => new \external_value(PARAM_INT, 'Badge to scan progress for', VALUE_DEFAULT),
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"studyplanid" => new \external_value(PARAM_INT,
'Study plan id to limit progress search to (to determine which students to scan)', VALUE_DEFAULT),
]);
}
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/**
* Parameter description for scan_badge_progress function
*/
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public static function scan_badge_progress_returns(): \external_description {
return new \external_single_structure([
"total" => new \external_value(PARAM_INT, 'Total number of students scanned'),
"issued" => new \external_value(PARAM_INT, 'Number of issued badges'),
]);
}
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/**
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* Scan badge for completion progress statistica
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* @param mixed $badgeid ID of the badge
* @param mixed $studyplanid ID of the relevant study plan
* @return array
*/
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public static function scan_badge_progress($badgeid, $studyplanid) {
global $DB;
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// Check access to the study plan.
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$o = studyplan::find_by_id($studyplanid);
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webservicehelper::require_capabilities(self::CAP_VIEW, $o->context());
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// Validate that badge is linked to studyplan.
if (!$o->badge_linked($badgeid)) {
throw new \webservice_access_exception("Badge {$badgeid} is not linked to studyplan {$o->id()}");
}
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// Get badge info.
$badge = new \core_badges\badge($badgeid);
$badgeinfo = new badgeinfo($badge);
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// Get the connected users.
$students = associationservice::all_associated($studyplanid);
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// Just get the user ids.
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$studentids = array_map(function ($a) {
return $a["id"];
}, $students);
return [
"total" => count($studentids),
"issued" => $badgeinfo->count_issued($studentids),
];
}
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}