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Developer Documentation
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Differences Between: [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 and 403]
Helper functions to implement the complex get_user_capability_course function.
| Copyright: | 2017 The Open University |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 432 lines (19 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
get_user_capability_course_helper:: (9 methods):
get_capability_info_at_each_context()
path_is_above()
any_path_is_above()
calculate_permission_tree()
remove_negative_subtrees()
remove_duplicate_nodes()
get_tree()
create_sql()
get_sql()
Class: get_user_capability_course_helper - X-Ref
Helper functions to implement the complex get_user_capability_course function.| get_capability_info_at_each_context($userid, $capability) X-Ref |
| Based on the given user's access data (roles) and system role definitions, works out an array of capability values at each relevant context for the given user and capability. This is organised by the effective context path (the one at which the capability takes effect) and then by role id. Note, however, that the resulting array only has the information that will be needed later. If there are Prohibits present in some roles, then they cannot be overridden by other roles or role overrides in lower contexts, therefore, such information, if any, is absent from the results. param: int $userid User id param: string $capability Capability e.g. 'moodle/course:view' return: array Array of capability constants, indexed by context path and role id |
| path_is_above($parentpath, $otherpath) X-Ref |
| Test if a context path $otherpath is the same as, or underneath, $parentpath. param: string $parentpath the path of the parent context. param: string $otherpath the path of another context. return: bool true if $otherpath is underneath (or equal to) $parentpath. |
| any_path_is_above($prohibitpaths, $otherpath) X-Ref |
| Test if a context path $otherpath is the same as, or underneath, any of $prohibitpaths. param: array $prohibitpaths array keys are context paths. param: string $otherpath the path of another context. return: int releavant $roleid if $otherpath is underneath (or equal to) |
| calculate_permission_tree(array $pathroleperms) X-Ref |
| Calculates a permission tree based on an array of information about role permissions. The input parameter must be in the format returned by get_capability_info_at_each_context. The output is the root of a tree of stdClass objects with the fields 'path' (a context path), 'allow' (true or false), and 'children' (an array of similar objects). param: array $pathroleperms Array of permissions return: \stdClass Root object of permission tree |
| remove_negative_subtrees($root) X-Ref |
| Given a permission tree (in calculate_permission_tree format), removes any subtrees that are negative from the root. For example, if a top-level node of the permission tree has 'false' permission then it is meaningless because the default permission is already false; this function will remove it. However, if there is a child within that node that is positive, then that will need to be kept. param: \stdClass $root Root object return: \stdClass Filtered tree root |
| remove_duplicate_nodes($parent) X-Ref |
| Removes duplicate nodes of a tree - where a child node has the same permission as its parent. param: \stdClass $parent Tree root node |
| get_tree($userid, $capability) X-Ref |
| Gets a permission tree for the given user and capability, representing the value of that capability at different contexts across the system. The tree will be simplified as far as possible. The output is the root of a tree of stdClass objects with the fields 'path' (a context path), 'allow' (true or false), and 'children' (an array of similar objects). param: int $userid User id param: string $capability Capability e.g. 'moodle/course:view' return: \stdClass Root node of tree |
| create_sql($parent) X-Ref |
| Creates SQL suitable for restricting by contexts listed in the given permission tree. This function relies on the permission tree being in the format created by get_tree. Specifically, all the children of the root element must be set to 'allow' permission, children of those children must be 'not allow', children of those grandchildren 'allow', etc. param: \stdClass $parent Root node of permission tree return: array Two-element array of SQL (containing ? placeholders) and then a params array |
| get_sql($userid, $capability) X-Ref |
| Gets SQL to restrict a query to contexts in which the user has a capability. This returns an array with two elements (SQL containing ? placeholders, and a params array). The SQL is intended to be used as part of a WHERE clause. It relies on the prefix 'x' being used for the Moodle context table. If the user does not have the permission anywhere at all (so that there is no point doing the query) then the two returned values will both be false. param: int $userid User id param: string $capability Capability e.g. 'moodle/course:view' return: array Two-element array of SQL (containing ? placeholders) and then a params array |
