diff --git a/lib/accesslib.php b/lib/accesslib.php index 065b1b0..82df625 100755 --- a/lib/accesslib.php +++ b/lib/accesslib.php @@ -171,6 +171,884 @@ $ACCESS = array(); // cache of caps for cron user switching and has_capability f $RDEFS = array(); // role definitions cache - helps a lot with mem usage in cron /** + * Abstract class for context levels. The context level classes encapsulate + * context level-specific logic. + */ +abstract class context_level { + /** + * prints human readable context identifier + */ + abstract public function print_context_name($context, $withprefix = true, $short = false); + + /** + * Extracts the relevant capabilities given a contextid. + * All case based, example an instance of forum context. + * Will fetch all forum related capabilities, while course contexts + * Will fetch all capabilities + * @param object context + * @return array(); + * + * capabilities + * `name` varchar(150) NOT NULL, + * `captype` varchar(50) NOT NULL, + * `contextlevel` int(10) NOT NULL, + * `component` varchar(100) NOT NULL, + */ + public function fetch_context_capabilities($context) { + $sort = 'ORDER BY contextlevel, component, name'; // To group them sensibly for display + + $SQL = $this->fetch_context_capabilities_sql($context); + + $records = get_records_sql($SQL.' '.$sort); + + if (empty($records)) { + $records = array(); + } + + return $records; + } + + /** + * sql for the removal of stale contexts + * + * @return string + */ + public function cleanup_contexts_sql() { + global $CFG; + + $sql = " SELECT c.contextlevel, + c.instanceid + FROM {$CFG->prefix}context c + LEFT OUTER JOIN {$CFG->prefix}{$this->table} t + ON c.instanceid = t.id + WHERE t.id IS NULL AND c.contextlevel = {$this->level}"; + + return $sql; + } + + /** + * returns sql string needed for fetch context capabilities + * + * @param object $context + * @return string; + */ + abstract protected function fetch_context_capabilities_sql($context); + + /** + * Recursive function which, given a context, find all its children context ids. + * + * When called for a course context, it will return the modules and blocks + * displayed in the course page. + * + * For course category contexts it will return categories and courses. It will + * NOT recurse into courses - if you want to do that, call it on the returned + * courses. + * + * If called on a course context it _will_ populate the cache with the appropriate + * contexts ;-) + * + * @param object $context. + * @return array of child records + */ + abstract public function get_child_contexts($context); + + /** + * This gets the mod/block/course/core etc strings. + * @param $component + * @param $contextlevel + */ + abstract public function get_component_string($component, $contextlevel); + + abstract public function build_context_path($force=false, $feedback=false); +} + +class context_course extends context_level { + protected $level = CONTEXT_COURSE; + protected $table = 'course'; + + public function print_context_name($context, $withprefix = true, $short = false) { + if ($context->instanceid == SITEID) { + $name = get_string('frontpage', 'admin'); + } else { + if ($course = get_record('course', 'id', $context->instanceid)) { + $name = ''; + + if ($withprefix){ + $name .= get_string('course').': '; + } + + if (!$short){ + $name .= format_string($course->shortname); + } else { + $name .= format_string($course->fullname); + } + } + } + + return $name; + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities + WHERE contextlevel IN (".CONTEXT_COURSE.",".CONTEXT_MODULE.",".CONTEXT_BLOCK.")"; + + return $SQL; + } + + public function get_child_contexts($context) { + global $CFG, $context_cache; + + // Find + // - module instances - easy + // - blocks assigned to the course-view page explicitly - easy + $sql = " SELECT ctx.* + FROM {$CFG->prefix}context ctx + WHERE ctx.path LIKE '{$context->path}/%' + AND ctx.contextlevel IN (".CONTEXT_MODULE.",".CONTEXT_BLOCK.") + "; + $rs = get_recordset_sql($sql); + $records = array(); + while ($rec = rs_fetch_next_record($rs)) { + $records[$rec->id] = $rec; + $context_cache[$rec->contextlevel][$rec->instanceid] = $rec; + } + rs_close($rs); + return $records; + } + + public function get_component_string($component, $contextlevel) { + if (preg_match('|^gradeimport/|', $component) + || preg_match('|^gradeexport/|', $component) + || preg_match('|^gradereport/|', $component)) { + $string = get_string('gradebook', 'admin'); + } else if (preg_match('|^coursereport/|', $component)) { + $string = get_string('coursereports'); + } else { + $string = get_string('course'); + } + + return $string; + } + + public function build_context_path($force = false, $feedback = false) { + global $CFG; + require_once($CFG->libdir.'/ddllib.php'); + + // System context + $sitectx = get_system_context(!$force); + $base = '/'.$sitectx->id; + + // Sitecourse + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { + set_field('context', 'path', "$base/{$sitecoursectx->id}", + 'id', $sitecoursectx->id); + set_field('context', 'depth', 2, + 'id', $sitecoursectx->id); + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + } + + $ctxemptyclause = " AND (ctx.path IS NULL + OR ctx.depth=0) "; + $emptyclause = " AND ({$CFG->prefix}context.path IS NULL + OR {$CFG->prefix}context.depth=0) "; + if ($force) { + $ctxemptyclause = $emptyclause = ''; + } + + /* MDL-11347: + * - mysql does not allow to use FROM in UPDATE statements + * - using two tables after UPDATE works in mysql, but might give unexpected + * results in pg 8 (depends on configuration) + * - using table alias in UPDATE does not work in pg < 8.2 + */ + if ($CFG->dbfamily == 'mysql') { + $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp + SET ct.path = temp.path, + ct.depth = temp.depth + WHERE ct.id = temp.id"; + } else if ($CFG->dbfamily == 'oracle') { + $updatesql = "UPDATE {$CFG->prefix}context ct + SET (ct.path, ct.depth) = + (SELECT temp.path, temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id=ct.id) + WHERE EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ct.id)"; + } else { + $updatesql = "UPDATE {$CFG->prefix}context + SET path = temp.path, + depth = temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id={$CFG->prefix}context.id"; + } + + $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; + + // Courses -- except sitecourse + $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) + SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 + FROM {$CFG->prefix}context ctx + JOIN {$CFG->prefix}course c ON ctx.instanceid=c.id + JOIN {$CFG->prefix}context pctx ON c.category=pctx.instanceid + WHERE ctx.contextlevel=".CONTEXT_COURSE." + AND c.id!=".SITEID." + AND pctx.contextlevel=".CONTEXT_COURSECAT." + AND NOT EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ctx.id) + $ctxemptyclause"; + execute_sql($sql, $feedback); + + execute_sql($updatesql, $feedback); + execute_sql($udelsql, $feedback); + + } +} + +class context_system extends context_level { + public function print_context_name($context, $withprefix = true, $short = false) { + return get_string('coresystem'); + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities"; + + return $SQL; + } + + public function get_child_contexts($context) { + // Just get all the contexts except for CONTEXT_SYSTEM level + // and hope we don't OOM in the process - don't cache + $sql = 'SELECT c.*'. + 'FROM '.$CFG->prefix.'context c '. + 'WHERE contextlevel != '.CONTEXT_SYSTEM; + + return get_records_sql($sql); + } + + public function get_component_string($component, $contextlevel) { + if (preg_match('|^enrol/|', $component)) { + $langname = str_replace('/', '_', $component); + $string = get_string('enrolname', $langname); + } else if (preg_match('|^block/|', $component)) { + $langname = str_replace('/', '_', $component); + $string = get_string('blockname', $langname); + } else if (preg_match('|^local|', $component)) { + $langname = str_replace('/', '_', $component); + $string = get_string('local'); + } else if (preg_match('|^report/|', $component)) { + $string = get_string('reports'); + } else { + $string = get_string('coresystem'); + } + + return $string; + } + + public function cleanup_contexts_sql() { + return null; + } + + public function build_context_path($force=false, $feedback=false) {} +} + +class context_coursecat extends context_level { + protected $level = CONTEXT_COURSECAT; + protected $table = 'course_categories'; + + public function print_context_name($context, $withprefix = true, $short = false) { + $name = ''; + + if ($category = get_record('course_categories', 'id', $context->instanceid)) { + if ($withprefix){ + $name = get_string('category').': '; + } + $name .=format_string($category->name); + } + + return $name; + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities + WHERE contextlevel IN (".CONTEXT_COURSECAT.",".CONTEXT_COURSE.",".CONTEXT_MODULE.",".CONTEXT_BLOCK.")"; + + return $SQL; + } + + public function get_child_contexts($context) { + // Find + // - categories + // - courses + $sql = " SELECT ctx.* + FROM {$CFG->prefix}context ctx + WHERE ctx.path LIKE '{$context->path}/%' + AND ctx.contextlevel IN (".CONTEXT_COURSECAT.",".CONTEXT_COURSE.") + "; + $rs = get_recordset_sql($sql); + $records = array(); + while ($rec = rs_fetch_next_record($rs)) { + $records[$rec->id] = $rec; + $context_cache[$rec->contextlevel][$rec->instanceid] = $rec; + } + rs_close($rs); + return $records; + } + + public function get_component_string($component, $contextlevel) { + return get_string('categories'); + } + + public function build_context_path($force = false, $feedback = false) { + global $CFG; + require_once($CFG->libdir.'/ddllib.php'); + + // System context + $sitectx = get_system_context(!$force); + $base = '/'.$sitectx->id; + + // Sitecourse + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { + set_field('context', 'path', "$base/{$sitecoursectx->id}", + 'id', $sitecoursectx->id); + set_field('context', 'depth', 2, + 'id', $sitecoursectx->id); + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + } + + $ctxemptyclause = " AND (ctx.path IS NULL + OR ctx.depth=0) "; + $emptyclause = " AND ({$CFG->prefix}context.path IS NULL + OR {$CFG->prefix}context.depth=0) "; + if ($force) { + $ctxemptyclause = $emptyclause = ''; + } + + /* MDL-11347: + * - mysql does not allow to use FROM in UPDATE statements + * - using two tables after UPDATE works in mysql, but might give unexpected + * results in pg 8 (depends on configuration) + * - using table alias in UPDATE does not work in pg < 8.2 + */ + if ($CFG->dbfamily == 'mysql') { + $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp + SET ct.path = temp.path, + ct.depth = temp.depth + WHERE ct.id = temp.id"; + } else if ($CFG->dbfamily == 'oracle') { + $updatesql = "UPDATE {$CFG->prefix}context ct + SET (ct.path, ct.depth) = + (SELECT temp.path, temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id=ct.id) + WHERE EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ct.id)"; + } else { + $updatesql = "UPDATE {$CFG->prefix}context + SET path = temp.path, + depth = temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id={$CFG->prefix}context.id"; + } + + $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; + + // Top level categories + $sql = "UPDATE {$CFG->prefix}context + SET depth=2, path=" . sql_concat("'$base/'", 'id') . " + WHERE contextlevel=".CONTEXT_COURSECAT." + AND EXISTS (SELECT 'x' + FROM {$CFG->prefix}course_categories cc + WHERE cc.id = {$CFG->prefix}context.instanceid + AND cc.depth=1) + $emptyclause"; + + execute_sql($sql, $feedback); + + execute_sql($udelsql, $feedback); + + // Deeper categories - one query per depthlevel + $maxdepth = get_field_sql("SELECT MAX(depth) + FROM {$CFG->prefix}course_categories"); + for ($n=2;$n<=$maxdepth;$n++) { + $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) + SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", $n+1 + FROM {$CFG->prefix}context ctx + JOIN {$CFG->prefix}course_categories c ON ctx.instanceid=c.id + JOIN {$CFG->prefix}context pctx ON c.parent=pctx.instanceid + WHERE ctx.contextlevel=".CONTEXT_COURSECAT." + AND pctx.contextlevel=".CONTEXT_COURSECAT." + AND c.depth=$n + AND NOT EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ctx.id) + $ctxemptyclause"; + execute_sql($sql, $feedback); + + // this is needed after every loop + // MDL-11532 + execute_sql($updatesql, $feedback); + execute_sql($udelsql, $feedback); + } + + } +} + +class context_module extends context_level { + protected $level = CONTEXT_MODULE; + protected $table = 'course_modules'; + + public function print_context_name($context, $withprefix = true, $short = false) { + $name = ''; + + if ($cm = get_record('course_modules','id',$context->instanceid)) { + if ($module = get_record('modules','id',$cm->module)) { + if ($mod = get_record($module->name, 'id', $cm->instance)) { + if ($withprefix){ + $name = get_string('activitymodule').': '; + } + $name .= $mod->name; + } + } + } + + return $name; + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $cm = get_record('course_modules', 'id', $context->instanceid); + $module = get_record('modules', 'id', $cm->module); + + $modfile = "$CFG->dirroot/mod/$module->name/lib.php"; + if (file_exists($modfile)) { + include_once($modfile); + $modfunction = $module->name.'_get_extra_capabilities'; + if (function_exists($modfunction)) { + $extracaps = $modfunction(); + } + } + if(empty($extracaps)) { + $extracaps = array(); + } + + // All modules allow viewhiddenactivities. This is so you can hide + // the module then override to allow specific roles to see it. + // The actual check is in course page so not module-specific + $extracaps[]="moodle/course:viewhiddenactivities"; + if (count($extracaps) == 1) { + $extra = "OR name = '".reset($extracaps)."'"; + } else { + foreach ($extracaps as $key=>$value) { + $extracaps[$key]= "'$value'"; + } + $extra = implode(',', $extracaps); + $extra = "OR name IN ($extra)"; + } + + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities + WHERE (contextlevel = ".CONTEXT_MODULE." + AND component = 'mod/$module->name') + $extra"; + + return $SQL; + } + + public function get_child_contexts($context) { + //no children by default + return array(); + } + + public function get_component_string($component, $contextlevel) { + return get_string('modulename', basename($component)); + } + + public function build_context_path($force=false, $feedback=false) { + global $CFG; + require_once($CFG->libdir.'/ddllib.php'); + + // System context + $sitectx = get_system_context(!$force); + $base = '/'.$sitectx->id; + + // Sitecourse + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { + set_field('context', 'path', "$base/{$sitecoursectx->id}", + 'id', $sitecoursectx->id); + set_field('context', 'depth', 2, + 'id', $sitecoursectx->id); + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + } + + $ctxemptyclause = " AND (ctx.path IS NULL + OR ctx.depth=0) "; + $emptyclause = " AND ({$CFG->prefix}context.path IS NULL + OR {$CFG->prefix}context.depth=0) "; + if ($force) { + $ctxemptyclause = $emptyclause = ''; + } + + /* MDL-11347: + * - mysql does not allow to use FROM in UPDATE statements + * - using two tables after UPDATE works in mysql, but might give unexpected + * results in pg 8 (depends on configuration) + * - using table alias in UPDATE does not work in pg < 8.2 + */ + if ($CFG->dbfamily == 'mysql') { + $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp + SET ct.path = temp.path, + ct.depth = temp.depth + WHERE ct.id = temp.id"; + } else if ($CFG->dbfamily == 'oracle') { + $updatesql = "UPDATE {$CFG->prefix}context ct + SET (ct.path, ct.depth) = + (SELECT temp.path, temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id=ct.id) + WHERE EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ct.id)"; + } else { + $updatesql = "UPDATE {$CFG->prefix}context + SET path = temp.path, + depth = temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id={$CFG->prefix}context.id"; + } + + $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; + + // Module instances + $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) + SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 + FROM {$CFG->prefix}context ctx + JOIN {$CFG->prefix}course_modules cm ON ctx.instanceid=cm.id + JOIN {$CFG->prefix}context pctx ON cm.course=pctx.instanceid + WHERE ctx.contextlevel=".CONTEXT_MODULE." + AND pctx.contextlevel=".CONTEXT_COURSE." + AND NOT EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ctx.id) + $ctxemptyclause"; + execute_sql($sql, $feedback); + + execute_sql($updatesql, $feedback); + execute_sql($udelsql, $feedback); + } +} + +class context_block extends context_level { + protected $level = CONTEXT_BLOCK; + protected $table = 'block_instance'; + + public function print_context_name($context, $withprefix = true, $short = false) { + $name = ''; + + if ($blockinstance = get_record('block_instance','id',$context->instanceid)) { + if ($block = get_record('block','id',$blockinstance->blockid)) { + global $CFG; + require_once("$CFG->dirroot/blocks/moodleblock.class.php"); + require_once("$CFG->dirroot/blocks/$block->name/block_$block->name.php"); + $blockname = "block_$block->name"; + if ($blockobject = new $blockname()) { + if ($withprefix){ + $name = get_string('block').': '; + } + $name .= $blockobject->title; + } + } + } + + return $name; + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $cb = get_record('block_instance', 'id', $context->instanceid); + $block = get_record('block', 'id', $cb->blockid); + + $extra = ""; + if ($blockinstance = block_instance($block->name)) { + if ($extracaps = $blockinstance->get_extra_capabilities()) { + foreach ($extracaps as $key=>$value) { + $extracaps[$key]= "'$value'"; + } + $extra = implode(',', $extracaps); + $extra = "OR name IN ($extra)"; + } + } + + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities + WHERE (contextlevel = ".CONTEXT_BLOCK." + AND component = 'block/$block->name') + $extra"; + + return $SQL; + } + + public function get_child_contexts($context) { + //no children by default + return array(); + } + + public function get_component_string($component, $contextlevel) { + if( $component == 'moodle' ){ + $string = get_string('block'); + }else{ + $string = get_string('blockname', 'block_'.basename($component)); + } + + return $string; + } + + public function build_context_path($force=false, $feedback=false) { + global $CFG; + require_once($CFG->libdir.'/ddllib.php'); + + // System context + $sitectx = get_system_context(!$force); + $base = '/'.$sitectx->id; + + // Sitecourse + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { + set_field('context', 'path', "$base/{$sitecoursectx->id}", + 'id', $sitecoursectx->id); + set_field('context', 'depth', 2, + 'id', $sitecoursectx->id); + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + } + + $ctxemptyclause = " AND (ctx.path IS NULL + OR ctx.depth=0) "; + $emptyclause = " AND ({$CFG->prefix}context.path IS NULL + OR {$CFG->prefix}context.depth=0) "; + if ($force) { + $ctxemptyclause = $emptyclause = ''; + } + + /* MDL-11347: + * - mysql does not allow to use FROM in UPDATE statements + * - using two tables after UPDATE works in mysql, but might give unexpected + * results in pg 8 (depends on configuration) + * - using table alias in UPDATE does not work in pg < 8.2 + */ + if ($CFG->dbfamily == 'mysql') { + $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp + SET ct.path = temp.path, + ct.depth = temp.depth + WHERE ct.id = temp.id"; + } else if ($CFG->dbfamily == 'oracle') { + $updatesql = "UPDATE {$CFG->prefix}context ct + SET (ct.path, ct.depth) = + (SELECT temp.path, temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id=ct.id) + WHERE EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ct.id)"; + } else { + $updatesql = "UPDATE {$CFG->prefix}context + SET path = temp.path, + depth = temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id={$CFG->prefix}context.id"; + } + + $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; + + // Blocks - non-pinned course-view only + $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) + SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 + FROM {$CFG->prefix}context ctx + JOIN {$CFG->prefix}block_instance bi ON ctx.instanceid = bi.id + JOIN {$CFG->prefix}context pctx ON bi.pageid=pctx.instanceid + WHERE ctx.contextlevel=".CONTEXT_BLOCK." + AND pctx.contextlevel=".CONTEXT_COURSE." + AND bi.pagetype='course-view' + AND NOT EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ctx.id) + $ctxemptyclause"; + execute_sql($sql, $feedback); + + execute_sql($updatesql, $feedback); + execute_sql($udelsql, $feedback); + + // Blocks - others + $sql = "UPDATE {$CFG->prefix}context + SET depth=2, path=".sql_concat("'$base/'", 'id')." + WHERE contextlevel=".CONTEXT_BLOCK." + AND EXISTS (SELECT 'x' + FROM {$CFG->prefix}block_instance bi + WHERE bi.id = {$CFG->prefix}context.instanceid + AND bi.pagetype!='course-view') + $emptyclause "; + execute_sql($sql, $feedback); + } +} + +class context_user extends context_level { + protected $level = CONTEXT_USER; + protected $table = 'user'; + + public function print_context_name($context, $withprefix = true, $short = false) { + $name = ''; + $user = get_record('user', 'id', $context->instanceid); + + if (!empty($user)) { + if ($withprefix){ + $name = get_string('user').': '; + } + $name .= fullname($user); + } + + return $name; + } + + public function fetch_context_capabilities_sql($context) { + global $CFG; + + $extracaps = array('moodle/grade:viewall'); + + foreach ($extracaps as $key=>$value) { + $extracaps[$key]= "'$value'"; + } + + $extra = implode(',', $extracaps); + $SQL = "SELECT * + FROM {$CFG->prefix}capabilities + WHERE contextlevel = ".CONTEXT_USER." + OR name IN ($extra)"; + + return $SQL; + } + + public function get_child_contexts($context) { + //no children by default + return array(); + } + + public function get_component_string($component, $contextlevel) { + return get_string('users'); + } + + public function build_context_path($force=false, $feedback=false) { + global $CFG; + require_once($CFG->libdir.'/ddllib.php'); + + // System context + $sitectx = get_system_context(!$force); + $base = '/'.$sitectx->id; + + // Sitecourse + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { + set_field('context', 'path', "$base/{$sitecoursectx->id}", + 'id', $sitecoursectx->id); + set_field('context', 'depth', 2, + 'id', $sitecoursectx->id); + $sitecoursectx = get_record('context', + 'contextlevel', CONTEXT_COURSE, + 'instanceid', SITEID); + } + + $ctxemptyclause = " AND (ctx.path IS NULL + OR ctx.depth=0) "; + $emptyclause = " AND ({$CFG->prefix}context.path IS NULL + OR {$CFG->prefix}context.depth=0) "; + if ($force) { + $ctxemptyclause = $emptyclause = ''; + } + + /* MDL-11347: + * - mysql does not allow to use FROM in UPDATE statements + * - using two tables after UPDATE works in mysql, but might give unexpected + * results in pg 8 (depends on configuration) + * - using table alias in UPDATE does not work in pg < 8.2 + */ + if ($CFG->dbfamily == 'mysql') { + $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp + SET ct.path = temp.path, + ct.depth = temp.depth + WHERE ct.id = temp.id"; + } else if ($CFG->dbfamily == 'oracle') { + $updatesql = "UPDATE {$CFG->prefix}context ct + SET (ct.path, ct.depth) = + (SELECT temp.path, temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id=ct.id) + WHERE EXISTS (SELECT 'x' + FROM {$CFG->prefix}context_temp temp + WHERE temp.id = ct.id)"; + } else { + $updatesql = "UPDATE {$CFG->prefix}context + SET path = temp.path, + depth = temp.depth + FROM {$CFG->prefix}context_temp temp + WHERE temp.id={$CFG->prefix}context.id"; + } + + $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; + + // User + $sql = "UPDATE {$CFG->prefix}context + SET depth=2, path=".sql_concat("'$base/'", 'id')." + WHERE contextlevel=".CONTEXT_USER." + AND EXISTS (SELECT 'x' + FROM {$CFG->prefix}user u + WHERE u.id = {$CFG->prefix}context.instanceid) + $emptyclause "; + execute_sql($sql, $feedback); + } +} + +$context_levels = array( + CONTEXT_SYSTEM => new context_system(), + CONTEXT_USER => new context_user(), + CONTEXT_COURSECAT => new context_coursecat(), + CONTEXT_COURSE => new context_course(), + CONTEXT_MODULE => new context_module(), + CONTEXT_BLOCK => new context_block(), + ); + +/** * Adds a context to the cache. * @param object $context Context object to be cached */ @@ -2389,43 +3267,23 @@ function create_contexts($contextlevel=null, $buildpaths=true, $feedback=false) * @return bool */ function cleanup_contexts() { - global $CFG; + global $CFG, $context_levels; + + // context class will contain function with the sql returned + // iterate over all the contexts to generate the sql + + $pre_sql = array(); + + foreach($context_levels as $cl) { + $current_sql = $cl->cleanup_contexts_sql(); + + if(!empty($current_sql)) { + $pre_sql[] = $current_sql; + } + } + + $sql = implode("\n UNION \n", $pre_sql); - $sql = " SELECT c.contextlevel, - c.instanceid AS instanceid - FROM {$CFG->prefix}context c - LEFT OUTER JOIN {$CFG->prefix}course_categories t - ON c.instanceid = t.id - WHERE t.id IS NULL AND c.contextlevel = " . CONTEXT_COURSECAT . " - UNION - SELECT c.contextlevel, - c.instanceid - FROM {$CFG->prefix}context c - LEFT OUTER JOIN {$CFG->prefix}course t - ON c.instanceid = t.id - WHERE t.id IS NULL AND c.contextlevel = " . CONTEXT_COURSE . " - UNION - SELECT c.contextlevel, - c.instanceid - FROM {$CFG->prefix}context c - LEFT OUTER JOIN {$CFG->prefix}course_modules t - ON c.instanceid = t.id - WHERE t.id IS NULL AND c.contextlevel = " . CONTEXT_MODULE . " - UNION - SELECT c.contextlevel, - c.instanceid - FROM {$CFG->prefix}context c - LEFT OUTER JOIN {$CFG->prefix}user t - ON c.instanceid = t.id - WHERE t.id IS NULL AND c.contextlevel = " . CONTEXT_USER . " - UNION - SELECT c.contextlevel, - c.instanceid - FROM {$CFG->prefix}context c - LEFT OUTER JOIN {$CFG->prefix}block_instance t - ON c.instanceid = t.id - WHERE t.id IS NULL AND c.contextlevel = " . CONTEXT_BLOCK . " - "; if ($rs = get_recordset_sql($sql)) { begin_sql(); $tx = true; @@ -2499,8 +3357,7 @@ function preload_course_contexts($courseid) { */ function get_context_instance($contextlevel, $instance=0) { - global $context_cache, $context_cache_id, $CFG; - static $allowed_contexts = array(CONTEXT_SYSTEM, CONTEXT_USER, CONTEXT_COURSECAT, CONTEXT_COURSE, CONTEXT_MODULE, CONTEXT_BLOCK); + global $context_cache, $context_cache_id, $CFG, $context_levels; if ($contextlevel === 'clearcache') { // TODO: Remove for v2.0 @@ -2517,7 +3374,7 @@ function get_context_instance($contextlevel, $instance=0) { } /// check allowed context levels - if (!in_array($contextlevel, $allowed_contexts)) { + if (empty($context_levels[$contextlevel])) { // fatal error, code must be fixed - probably typo or switched parameters error('Error: get_context_instance() called with incorrect context level "'.s($contextlevel).'"'); } @@ -3430,85 +4287,13 @@ function capabilities_cleanup($component, $newcapdef=NULL) { * prints human readable context identifier. */ function print_context_name($context, $withprefix = true, $short = false) { + global $context_levels; - $name = ''; - switch ($context->contextlevel) { - - case CONTEXT_SYSTEM: // by now it's a definite an inherit - $name = get_string('coresystem'); - break; - - case CONTEXT_USER: - if ($user = get_record('user', 'id', $context->instanceid)) { - if ($withprefix){ - $name = get_string('user').': '; - } - $name .= fullname($user); - } - break; - - case CONTEXT_COURSECAT: // Coursecat -> coursecat or site - if ($category = get_record('course_categories', 'id', $context->instanceid)) { - if ($withprefix){ - $name = get_string('category').': '; - } - $name .=format_string($category->name); - } - break; - - case CONTEXT_COURSE: // 1 to 1 to course cat - if ($context->instanceid == SITEID) { - $name = get_string('frontpage', 'admin'); - } else { - if ($course = get_record('course', 'id', $context->instanceid)) { - if ($withprefix){ - $name = get_string('course').': '; - } - if (!$short){ - $name .= format_string($course->shortname); - } else { - $name .= format_string($course->fullname); - } - } - } - break; - - case CONTEXT_MODULE: // 1 to 1 to course - if ($cm = get_record('course_modules','id',$context->instanceid)) { - if ($module = get_record('modules','id',$cm->module)) { - if ($mod = get_record($module->name, 'id', $cm->instance)) { - if ($withprefix){ - $name = get_string('activitymodule').': '; - } - $name .= $mod->name; - } - } - } - break; - - case CONTEXT_BLOCK: // not necessarily 1 to 1 to course - if ($blockinstance = get_record('block_instance','id',$context->instanceid)) { - if ($block = get_record('block','id',$blockinstance->blockid)) { - global $CFG; - require_once("$CFG->dirroot/blocks/moodleblock.class.php"); - require_once("$CFG->dirroot/blocks/$block->name/block_$block->name.php"); - $blockname = "block_$block->name"; - if ($blockobject = new $blockname()) { - if ($withprefix){ - $name = get_string('block').': '; - } - $name .= $blockobject->title; - } - } - } - break; - - default: - error ('This is an unknown context (' . $context->contextlevel . ') in print_context_name!'); - return false; - + if (!empty($context_levels[$context->contextlevel])) { + return $context_levels[$context->contextlevel]->print_context_name($context, $withprefix, $short); + } else { + error ('This is an unknown context (' . $context->contextlevel . ') in print_context_name!'); } - return $name; } @@ -3527,110 +4312,13 @@ function print_context_name($context, $withprefix = true, $short = false) { * `component` varchar(100) NOT NULL, */ function fetch_context_capabilities($context) { + global $CFG, $context_levels; - global $CFG; - - $sort = 'ORDER BY contextlevel,component,name'; // To group them sensibly for display - - switch ($context->contextlevel) { - - case CONTEXT_SYSTEM: // all - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities"; - break; - - case CONTEXT_USER: - $extracaps = array('moodle/grade:viewall'); - foreach ($extracaps as $key=>$value) { - $extracaps[$key]= "'$value'"; - } - $extra = implode(',', $extracaps); - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities - WHERE contextlevel = ".CONTEXT_USER." - OR name IN ($extra)"; - break; - - case CONTEXT_COURSECAT: // course category context and bellow - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities - WHERE contextlevel IN (".CONTEXT_COURSECAT.",".CONTEXT_COURSE.",".CONTEXT_MODULE.",".CONTEXT_BLOCK.")"; - break; - - case CONTEXT_COURSE: // course context and bellow - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities - WHERE contextlevel IN (".CONTEXT_COURSE.",".CONTEXT_MODULE.",".CONTEXT_BLOCK.")"; - break; - - case CONTEXT_MODULE: // mod caps - $cm = get_record('course_modules', 'id', $context->instanceid); - $module = get_record('modules', 'id', $cm->module); - - $modfile = "$CFG->dirroot/mod/$module->name/lib.php"; - if (file_exists($modfile)) { - include_once($modfile); - $modfunction = $module->name.'_get_extra_capabilities'; - if (function_exists($modfunction)) { - $extracaps = $modfunction(); - } - } - if(empty($extracaps)) { - $extracaps = array(); - } - - // All modules allow viewhiddenactivities. This is so you can hide - // the module then override to allow specific roles to see it. - // The actual check is in course page so not module-specific - $extracaps[]="moodle/course:viewhiddenactivities"; - if (count($extracaps) == 1) { - $extra = "OR name = '".reset($extracaps)."'"; - } else { - foreach ($extracaps as $key=>$value) { - $extracaps[$key]= "'$value'"; - } - $extra = implode(',', $extracaps); - $extra = "OR name IN ($extra)"; - } - - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities - WHERE (contextlevel = ".CONTEXT_MODULE." - AND component = 'mod/$module->name') - $extra"; - break; - - case CONTEXT_BLOCK: // block caps - $cb = get_record('block_instance', 'id', $context->instanceid); - $block = get_record('block', 'id', $cb->blockid); - - $extra = ""; - if ($blockinstance = block_instance($block->name)) { - if ($extracaps = $blockinstance->get_extra_capabilities()) { - foreach ($extracaps as $key=>$value) { - $extracaps[$key]= "'$value'"; - } - $extra = implode(',', $extracaps); - $extra = "OR name IN ($extra)"; - } - } - - $SQL = "SELECT * - FROM {$CFG->prefix}capabilities - WHERE (contextlevel = ".CONTEXT_BLOCK." - AND component = 'block/$block->name') - $extra"; - break; - - default: + if(!empty($context_levels[$context->contextlevel])) { + return $context_levels[$context->contextlevel]->fetch_context_capabilities($context); + } else { return false; } - - if (!$records = get_records_sql($SQL.' '.$sort)) { - $records = array(); - } - - return $records; } @@ -3742,81 +4430,12 @@ function is_inside_frontpage($context) { * @return array of child records */ function get_child_contexts($context) { + global $CFG, $context_cache, $context_levels; - global $CFG, $context_cache; - - // We *MUST* populate the context_cache as the callers - // will probably ask for the full record anyway soon after - // soon after calling us ;-) - - switch ($context->contextlevel) { - - case CONTEXT_BLOCK: - // No children. - return array(); - break; - - case CONTEXT_MODULE: - // No children. - return array(); - break; - - case CONTEXT_COURSE: - // Find - // - module instances - easy - // - blocks assigned to the course-view page explicitly - easy - $sql = " SELECT ctx.* - FROM {$CFG->prefix}context ctx - WHERE ctx.path LIKE '{$context->path}/%' - AND ctx.contextlevel IN (".CONTEXT_MODULE.",".CONTEXT_BLOCK.") - "; - $rs = get_recordset_sql($sql); - $records = array(); - while ($rec = rs_fetch_next_record($rs)) { - $records[$rec->id] = $rec; - $context_cache[$rec->contextlevel][$rec->instanceid] = $rec; - } - rs_close($rs); - return $records; - break; - - case CONTEXT_COURSECAT: - // Find - // - categories - // - courses - $sql = " SELECT ctx.* - FROM {$CFG->prefix}context ctx - WHERE ctx.path LIKE '{$context->path}/%' - AND ctx.contextlevel IN (".CONTEXT_COURSECAT.",".CONTEXT_COURSE.") - "; - $rs = get_recordset_sql($sql); - $records = array(); - while ($rec = rs_fetch_next_record($rs)) { - $records[$rec->id] = $rec; - $context_cache[$rec->contextlevel][$rec->instanceid] = $rec; - } - rs_close($rs); - return $records; - break; - - case CONTEXT_USER: - // No children. - return array(); - break; - - case CONTEXT_SYSTEM: - // Just get all the contexts except for CONTEXT_SYSTEM level - // and hope we don't OOM in the process - don't cache - $sql = 'SELECT c.*'. - 'FROM '.$CFG->prefix.'context c '. - 'WHERE contextlevel != '.CONTEXT_SYSTEM; - - return get_records_sql($sql); - break; - - default: - error('This is an unknown context (' . $context->contextlevel . ') in get_child_contexts!'); - return false; + if(!empty($context_levels[$context->contextlevel])) { + return $context_levels[$context->contextlevel]->get_child_contexts($context); + } else { + error('This is an unknown context (' . $context->contextlevel . ') in get_child_contexts!'); } } @@ -3925,64 +4544,13 @@ function get_capability_string($capabilityname) { * @param $contextlevel */ function get_component_string($component, $contextlevel) { + global $context_levels; - switch ($contextlevel) { - - case CONTEXT_SYSTEM: - if (preg_match('|^enrol/|', $component)) { - $langname = str_replace('/', '_', $component); - $string = get_string('enrolname', $langname); - } else if (preg_match('|^block/|', $component)) { - $langname = str_replace('/', '_', $component); - $string = get_string('blockname', $langname); - } else if (preg_match('|^local|', $component)) { - $langname = str_replace('/', '_', $component); - $string = get_string('local'); - } else if (preg_match('|^report/|', $component)) { - $string = get_string('reports'); - } else { - $string = get_string('coresystem'); - } - break; - - case CONTEXT_USER: - $string = get_string('users'); - break; - - case CONTEXT_COURSECAT: - $string = get_string('categories'); - break; - - case CONTEXT_COURSE: - if (preg_match('|^gradeimport/|', $component) - || preg_match('|^gradeexport/|', $component) - || preg_match('|^gradereport/|', $component)) { - $string = get_string('gradebook', 'admin'); - } else if (preg_match('|^coursereport/|', $component)) { - $string = get_string('coursereports'); - } else { - $string = get_string('course'); - } - break; - - case CONTEXT_MODULE: - $string = get_string('modulename', basename($component)); - break; - - case CONTEXT_BLOCK: - if( $component == 'moodle' ){ - $string = get_string('block'); - }else{ - $string = get_string('blockname', 'block_'.basename($component)); - } - break; - - default: - error ('This is an unknown context $contextlevel (' . $contextlevel . ') in get_component_string!'); - return false; - + if(!empty($context_levels[$contextlevel])) { + return $context_levels[$contextlevel]->get_component_string($component, $contextlevel); + } else { + error ('This is an unknown context $contextlevel (' . $contextlevel . ') in get_component_string!'); } - return $string; } /** @@ -5394,181 +5962,12 @@ function component_level_changed($cap, $comp, $contextlevel) { * @return void */ function build_context_path($force=false, $feedback=false) { - global $CFG; - require_once($CFG->libdir.'/ddllib.php'); - - // System context - $sitectx = get_system_context(!$force); - $base = '/'.$sitectx->id; - - // Sitecourse - $sitecoursectx = get_record('context', - 'contextlevel', CONTEXT_COURSE, - 'instanceid', SITEID); - if ($force || $sitecoursectx->path !== "$base/{$sitecoursectx->id}") { - set_field('context', 'path', "$base/{$sitecoursectx->id}", - 'id', $sitecoursectx->id); - set_field('context', 'depth', 2, - 'id', $sitecoursectx->id); - $sitecoursectx = get_record('context', - 'contextlevel', CONTEXT_COURSE, - 'instanceid', SITEID); - } - - $ctxemptyclause = " AND (ctx.path IS NULL - OR ctx.depth=0) "; - $emptyclause = " AND ({$CFG->prefix}context.path IS NULL - OR {$CFG->prefix}context.depth=0) "; - if ($force) { - $ctxemptyclause = $emptyclause = ''; - } + global $context_levels; - /* MDL-11347: - * - mysql does not allow to use FROM in UPDATE statements - * - using two tables after UPDATE works in mysql, but might give unexpected - * results in pg 8 (depends on configuration) - * - using table alias in UPDATE does not work in pg < 8.2 - */ - if ($CFG->dbfamily == 'mysql') { - $updatesql = "UPDATE {$CFG->prefix}context ct, {$CFG->prefix}context_temp temp - SET ct.path = temp.path, - ct.depth = temp.depth - WHERE ct.id = temp.id"; - } else if ($CFG->dbfamily == 'oracle') { - $updatesql = "UPDATE {$CFG->prefix}context ct - SET (ct.path, ct.depth) = - (SELECT temp.path, temp.depth - FROM {$CFG->prefix}context_temp temp - WHERE temp.id=ct.id) - WHERE EXISTS (SELECT 'x' - FROM {$CFG->prefix}context_temp temp - WHERE temp.id = ct.id)"; - } else { - $updatesql = "UPDATE {$CFG->prefix}context - SET path = temp.path, - depth = temp.depth - FROM {$CFG->prefix}context_temp temp - WHERE temp.id={$CFG->prefix}context.id"; - } - - $udelsql = "TRUNCATE TABLE {$CFG->prefix}context_temp"; - - // Top level categories - $sql = "UPDATE {$CFG->prefix}context - SET depth=2, path=" . sql_concat("'$base/'", 'id') . " - WHERE contextlevel=".CONTEXT_COURSECAT." - AND EXISTS (SELECT 'x' - FROM {$CFG->prefix}course_categories cc - WHERE cc.id = {$CFG->prefix}context.instanceid - AND cc.depth=1) - $emptyclause"; - - execute_sql($sql, $feedback); - - execute_sql($udelsql, $feedback); - - // Deeper categories - one query per depthlevel - $maxdepth = get_field_sql("SELECT MAX(depth) - FROM {$CFG->prefix}course_categories"); - for ($n=2;$n<=$maxdepth;$n++) { - $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) - SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", $n+1 - FROM {$CFG->prefix}context ctx - JOIN {$CFG->prefix}course_categories c ON ctx.instanceid=c.id - JOIN {$CFG->prefix}context pctx ON c.parent=pctx.instanceid - WHERE ctx.contextlevel=".CONTEXT_COURSECAT." - AND pctx.contextlevel=".CONTEXT_COURSECAT." - AND c.depth=$n - AND NOT EXISTS (SELECT 'x' - FROM {$CFG->prefix}context_temp temp - WHERE temp.id = ctx.id) - $ctxemptyclause"; - execute_sql($sql, $feedback); - - // this is needed after every loop - // MDL-11532 - execute_sql($updatesql, $feedback); - execute_sql($udelsql, $feedback); + foreach($context_levels as $cl) { + $cl->build_context_path($force, $feedback); } - // Courses -- except sitecourse - $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) - SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 - FROM {$CFG->prefix}context ctx - JOIN {$CFG->prefix}course c ON ctx.instanceid=c.id - JOIN {$CFG->prefix}context pctx ON c.category=pctx.instanceid - WHERE ctx.contextlevel=".CONTEXT_COURSE." - AND c.id!=".SITEID." - AND pctx.contextlevel=".CONTEXT_COURSECAT." - AND NOT EXISTS (SELECT 'x' - FROM {$CFG->prefix}context_temp temp - WHERE temp.id = ctx.id) - $ctxemptyclause"; - execute_sql($sql, $feedback); - - execute_sql($updatesql, $feedback); - execute_sql($udelsql, $feedback); - - // Module instances - $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) - SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 - FROM {$CFG->prefix}context ctx - JOIN {$CFG->prefix}course_modules cm ON ctx.instanceid=cm.id - JOIN {$CFG->prefix}context pctx ON cm.course=pctx.instanceid - WHERE ctx.contextlevel=".CONTEXT_MODULE." - AND pctx.contextlevel=".CONTEXT_COURSE." - AND NOT EXISTS (SELECT 'x' - FROM {$CFG->prefix}context_temp temp - WHERE temp.id = ctx.id) - $ctxemptyclause"; - execute_sql($sql, $feedback); - - execute_sql($updatesql, $feedback); - execute_sql($udelsql, $feedback); - - // Blocks - non-pinned course-view only - $sql = "INSERT INTO {$CFG->prefix}context_temp (id, path, depth) - SELECT ctx.id, ".sql_concat('pctx.path', "'/'", 'ctx.id').", pctx.depth+1 - FROM {$CFG->prefix}context ctx - JOIN {$CFG->prefix}block_instance bi ON ctx.instanceid = bi.id - JOIN {$CFG->prefix}context pctx ON bi.pageid=pctx.instanceid - WHERE ctx.contextlevel=".CONTEXT_BLOCK." - AND pctx.contextlevel=".CONTEXT_COURSE." - AND bi.pagetype='course-view' - AND NOT EXISTS (SELECT 'x' - FROM {$CFG->prefix}context_temp temp - WHERE temp.id = ctx.id) - $ctxemptyclause"; - execute_sql($sql, $feedback); - - execute_sql($updatesql, $feedback); - execute_sql($udelsql, $feedback); - - // Blocks - others - $sql = "UPDATE {$CFG->prefix}context - SET depth=2, path=".sql_concat("'$base/'", 'id')." - WHERE contextlevel=".CONTEXT_BLOCK." - AND EXISTS (SELECT 'x' - FROM {$CFG->prefix}block_instance bi - WHERE bi.id = {$CFG->prefix}context.instanceid - AND bi.pagetype!='course-view') - $emptyclause "; - execute_sql($sql, $feedback); - - // User - $sql = "UPDATE {$CFG->prefix}context - SET depth=2, path=".sql_concat("'$base/'", 'id')." - WHERE contextlevel=".CONTEXT_USER." - AND EXISTS (SELECT 'x' - FROM {$CFG->prefix}user u - WHERE u.id = {$CFG->prefix}context.instanceid) - $emptyclause "; - execute_sql($sql, $feedback); - - // Personal TODO - - //TODO: fix group contexts - // reset static course cache - it might have incorrect cached data global $context_cache, $context_cache_id; $context_cache = array();