/**
* Create a new context record for use by all roles-related stuff
* assumes that the caller has done the homework.
*
* @param $level
* @param $instanceid
*
* @return object newly created context
*/
function create_context($contextlevel, $instanceid)
{
global $CFG;
if ($contextlevel == CONTEXT_SYSTEM) {
return create_system_context();
}
$context = new object();
$context->contextlevel = $contextlevel;
$context->instanceid = $instanceid;
// Define $context->path based on the parent
// context. In other words... Who is your daddy?
$basepath = '/' . SYSCONTEXTID;
$basedepth = 1;
$result = true;
switch ($contextlevel) {
case CONTEXT_COURSECAT:
$sql = "SELECT ctx.path, ctx.depth \n FROM {$CFG->prefix}context ctx\n JOIN {$CFG->prefix}course_categories cc\n ON (cc.parent=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSECAT . ")\n WHERE cc.id={$instanceid}";
if ($p = get_record_sql($sql)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($category = get_record('course_categories', 'id', $instanceid)) {
if (empty($category->parent)) {
// ok - this is a top category
} else {
if ($parent = get_context_instance(CONTEXT_COURSECAT, $category->parent)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// wrong parent category - no big deal, this can be fixed later
$basepath = null;
$basedepth = 0;
}
}
} else {
// incorrect category id
$result = false;
}
}
break;
case CONTEXT_COURSE:
$sql = "SELECT ctx.path, ctx.depth\n FROM {$CFG->prefix}context ctx\n JOIN {$CFG->prefix}course c\n ON (c.category=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSECAT . ")\n WHERE c.id={$instanceid} AND c.id !=" . SITEID;
if ($p = get_record_sql($sql)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($course = get_record('course', 'id', $instanceid)) {
if ($course->id == SITEID) {
//ok - no parent category
} else {
if ($parent = get_context_instance(CONTEXT_COURSECAT, $course->category)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// wrong parent category of course - no big deal, this can be fixed later
$basepath = null;
$basedepth = 0;
}
}
} else {
if ($instanceid == SITEID) {
// no errors for missing site course during installation
return false;
} else {
// incorrect course id
$result = false;
}
}
}
break;
case CONTEXT_MODULE:
$sql = "SELECT ctx.path, ctx.depth\n FROM {$CFG->prefix}context ctx\n JOIN {$CFG->prefix}course_modules cm\n ON (cm.course=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSE . ")\n WHERE cm.id={$instanceid}";
if ($p = get_record_sql($sql)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($cm = get_record('course_modules', 'id', $instanceid)) {
if ($parent = get_context_instance(CONTEXT_COURSE, $cm->course)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// course does not exist - modules can not exist without a course
$result = false;
}
} else {
// cm does not exist
$result = false;
}
}
break;
case CONTEXT_BLOCK:
// Only non-pinned & course-page based
$sql = "SELECT ctx.path, ctx.depth\n FROM {$CFG->prefix}context ctx\n JOIN {$CFG->prefix}block_instance bi\n ON (bi.pageid=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSE . ")\n WHERE bi.id={$instanceid} AND bi.pagetype='course-view'";
if ($p = get_record_sql($sql)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($bi = get_record('block_instance', 'id', $instanceid)) {
if ($bi->pagetype != 'course-view') {
// ok - not a course block
} else {
if ($parent = get_context_instance(CONTEXT_COURSE, $bi->pageid)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// parent course does not exist - course blocks can not exist without a course
$result = false;
}
}
} else {
// block does not exist
$result = false;
}
}
break;
case CONTEXT_USER:
// default to basepath
break;
}
// if grandparents unknown, maybe rebuild_context_path() will solve it later
if ($basedepth != 0) {
$context->depth = $basedepth + 1;
}
if ($result and $id = insert_record('context', $context)) {
// can't set the full path till we know the id!
if ($basedepth != 0 and !empty($basepath)) {
set_field('context', 'path', $basepath . '/' . $id, 'id', $id);
}
return get_context_instance_by_id($id);
} else {
debugging('Error: could not insert new context level "' . s($contextlevel) . '", instance "' . s($instanceid) . '".');
return false;
}
}
/**
* Create a new context record for use by all roles-related stuff
* assumes that the caller has done the homework.
*
* @param $level
* @param $instanceid
*
* @return object newly created context
*/
function create_context($contextlevel, $instanceid)
{
global $CFG, $DB;
if ($contextlevel == CONTEXT_SYSTEM) {
return create_system_context();
}
$context = new object();
$context->contextlevel = $contextlevel;
$context->instanceid = $instanceid;
// Define $context->path based on the parent
// context. In other words... Who is your daddy?
$basepath = '/' . SYSCONTEXTID;
$basedepth = 1;
$result = true;
$error_message = null;
switch ($contextlevel) {
case CONTEXT_COURSECAT:
$sql = "SELECT ctx.path, ctx.depth\n FROM {context} ctx\n JOIN {course_categories} cc\n ON (cc.parent=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSECAT . ")\n WHERE cc.id=?";
$params = array($instanceid);
if ($p = $DB->get_record_sql($sql, $params)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($category = $DB->get_record('course_categories', array('id' => $instanceid))) {
if (empty($category->parent)) {
// ok - this is a top category
} else {
if ($parent = get_context_instance(CONTEXT_COURSECAT, $category->parent)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// wrong parent category - no big deal, this can be fixed later
$basepath = null;
$basedepth = 0;
}
}
} else {
// incorrect category id
$error_message = "incorrect course category id ({$instanceid})";
$result = false;
}
}
break;
case CONTEXT_COURSE:
$sql = "SELECT ctx.path, ctx.depth\n FROM {context} ctx\n JOIN {course} c\n ON (c.category=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSECAT . ")\n WHERE c.id=? AND c.id !=" . SITEID;
$params = array($instanceid);
if ($p = $DB->get_record_sql($sql, $params)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($course = $DB->get_record('course', array('id' => $instanceid))) {
if ($course->id == SITEID) {
//ok - no parent category
} else {
if ($parent = get_context_instance(CONTEXT_COURSECAT, $course->category)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// wrong parent category of course - no big deal, this can be fixed later
$basepath = null;
$basedepth = 0;
}
}
} else {
if ($instanceid == SITEID) {
// no errors for missing site course during installation
return false;
} else {
// incorrect course id
$error_message = "incorrect course id ({$instanceid})";
$result = false;
}
}
}
break;
case CONTEXT_MODULE:
$sql = "SELECT ctx.path, ctx.depth\n FROM {context} ctx\n JOIN {course_modules} cm\n ON (cm.course=ctx.instanceid AND ctx.contextlevel=" . CONTEXT_COURSE . ")\n WHERE cm.id=?";
$params = array($instanceid);
if ($p = $DB->get_record_sql($sql, $params)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
if ($cm = $DB->get_record('course_modules', array('id' => $instanceid))) {
if ($parent = get_context_instance(CONTEXT_COURSE, $cm->course)) {
$basepath = $parent->path;
$basedepth = $parent->depth;
} else {
// course does not exist - modules can not exist without a course
$error_message = "course does not exist ({$cm->course}) - modules can not exist without a course";
$result = false;
}
} else {
// cm does not exist
$error_message = "cm with id {$instanceid} does not exist";
$result = false;
}
}
break;
case CONTEXT_BLOCK:
// Only non-pinned & course-page based
$sql = "SELECT ctx.path, ctx.depth\n FROM {context} ctx\n JOIN {block_instances} bi ON (bi.contextid=ctx.id)\n WHERE bi.id=? AND ctx.contextlevel=?";
$params = array($instanceid, CONTEXT_COURSE);
if ($p = $DB->get_record_sql($sql, $params)) {
$basepath = $p->path;
$basedepth = $p->depth;
} else {
// block does not exist
$error_message = 'block or parent context does not exist';
$result = false;
}
break;
case CONTEXT_USER:
// default to basepath
break;
}
// if grandparents unknown, maybe rebuild_context_path() will solve it later
if ($basedepth != 0) {
$context->depth = $basedepth + 1;
}
if ($result and $id = $DB->insert_record('context', $context)) {
// can't set the full path till we know the id!
if ($basedepth != 0 and !empty($basepath)) {
$DB->set_field('context', 'path', $basepath . '/' . $id, array('id' => $id));
}
return get_context_instance_by_id($id);
} else {
debugging('Error: could not insert new context level "' . s($contextlevel) . '", instance "' . s($instanceid) . '". ' . $error_message);
return false;
}
}
/**
* Create a new context record for use by all roles-related stuff
* @param $level
* @param $instanceid
*
* @return object newly created context (or existing one with a debug warning)
*/
function create_context($contextlevel, $instanceid)
{
if (!($context = get_record('context', 'contextlevel', $contextlevel, 'instanceid', $instanceid))) {
if (!validate_context($contextlevel, $instanceid)) {
debugging('Error: Invalid context creation request for level "' . s($contextlevel) . '", instance "' . s($instanceid) . '".');
return NULL;
}
if ($contextlevel == CONTEXT_SYSTEM) {
return create_system_context();
}
$context = new object();
$context->contextlevel = $contextlevel;
$context->instanceid = $instanceid;
if ($id = insert_record('context', $context)) {
// we need to populate context_rel for every new context inserted
$c = get_record('context', 'id', $id);
insert_context_rel($c);
return $c;
} else {
debugging('Error: could not insert new context level "' . s($contextlevel) . '", instance "' . s($instanceid) . '".');
return NULL;
}
} else {
debugging('Warning: Context id "' . s($context->id) . '" not created, because it already exists.');
return $context;
}
}
