Access api – moodledocs

Moodle is using a role based access control model. Data recovery devices Most entities in Moodle (system, users, course categories, courses, modules and blocks) are represented by contexts that are arranged in a tree like hierarchy called context tree. Moto g data recovery software Role is a set of capability definitions, each capability usually represents an ability of user to do something. Data recovery windows 10 Roles are defined at the top most system context level.


Database youtube Role definitions can be overridden at lower context levels. H2 database console User access control is calculated from the definitions of roles assigned to users.

All users that did not log-in yet automatically get the default role defined in $CFG->notloggedinroleid, it is not possible to assign any other role to this non-existent user id. Database browser There is one special guest user account that is used when user logs in using the guest login button or when guest autologin is enabled. Database help Again you can not assign any roles to the guest account directly, this account gets the $CFG->guestroleid automatically. Database vendors All other authenticated users get the default user role specified in $CFG->defaultuserroleid and in the frontpage context the role specified in $CFG->defaultfrontpageroleid.

Capabilities are defined by $capabilities array defined in db/access.php files. Database key The name of the capability consists of “plugintype/pluginname:capabilityname”.

$capabilities = array ( ‘mod/folder:managefiles’ => array ( ‘riskbitmask’ => RISK_SPAM , ‘captype’ => ‘write’ , ‘contextlevel’ => CONTEXT_MODULE , ‘archetypes’ => array ( ‘editingteacher’ => CAP_ALLOW

• captype – read or write capability type, for security reasons system prevents all write capabilities for guest account and not-logged-in users

• contextlevel – specified as context level constant. Data recovery live cd Declares the typical context level where this capability is checked. Data recovery clean room This capability can be checked with contexts that are at a lower level (e.g. Database view ‘moodle/site:accessallgroups’ – could be checked with CONTEXT_MODULE).

• archetypes – specifies defaults for roles with standard archetypes, this is used in installs, upgrades and when resetting roles (it is recommended to use only CAP_ALLOW here). Data recovery fort lauderdale Archetypes are defined in mdl_role table. Data recovery equipment tools See also Role archetypes.

• clonepermissionsfrom – when you are adding a new capability, you can tell Moodle to copy the permissions for each role from the current settings for another capabilty. Data recovery lab This may give better defaults than just using archetypes for administrators who have heavily customised their roles configuration. Data recovery online The full syntax is: ‘clonepermissionsfrom’ => ‘moodle/quiz:attempt’,

• In releases before May 2012 clonepermissionsfrom works only inside individual plugins or only in core, in later releases plugins may also clone permissions from core, success of other cloning operations depends on upgrade order.

It is necessary to bump up plugin version number after any change in db/access.php, so that the upgrade scripts can make the necessary changes to the database. Database union To run the upgrade scripts, log in to Moodle as administrator, navigate to the site home page, and follow the instructions. Data recovery houston (If you need to test the upgrade script without changing the plugin version, it is also possible to set back the version number in the mdl_block or mdl_modules table in the database.)

The capability names are defined in plugin language files, the name of the string consists of “pluginname:capabilityname”, in the example above it would be:

$systemcontext = context_system :: instance ( ) ; $usercontext = context_user :: instance ( $user -> id ) ; $categorycontext = context_coursecat :: instance ( $category -> id ) ; $coursecontext = context_course :: instance ( $course -> id ) ; $contextmodule = context_module :: instance ( $cm -> id ) ;

There are multiple deprecated context related functions since 2.2, it is not necessary to replace them immediately. 7m database soccer basketball The following two functions are equivalent to the context fetching examples above:

function get_context_instance ( $contextlevel , $instance = 0 , $strictness = IGNORE_MISSING ) function get_context_instance_by_id ( $id , $strictness = IGNORE_MISSING ) Determining that a user has a given capability

When implementing access control always ask “Does the user have capability to do something?”. Create database link It is incorrect to ask “Does the user have a role somewhere?”.

By default checks the capabilities of the current user, but you can pass a different userid. Database form By default will return true for admin users, it is not recommended to use false here.

function require_capability ( $capability , context $context , $userid = null , $doanything = true , $errormessage = ‘nopermissions’ , $stringfile = ” ) { Enrolment functions

Other related functions function require_login ( $courseorid = NULL , $autologinguest = true , $cm = NULL , $setwantsurltome = true , $preventredirect = false ) function require_course_login ( $courseorid , $autologinguest = true , $cm = NULL , $setwantsurltome = true , $preventredirect = false ) function get_users_by_capability (context $context , $capability , $fields = ” , $sort = ” , $limitfrom = ” , $limitnum = ” , $groups = ” , $exceptions = ” , $doanything_ignored = null , $view_ignored = null , $useviewallgroups = false ) function isguestuser ( $user = null ) function isloggedin ( ) function is_siteadmin ( $user_or_id = null ) function is_guest (context $context , $user = null ) function is_viewing (context $context , $user = null , $withcapability = ” ) require_login()

This function is supposed to be used only in activities that want to allow read access to content on the frontpage without logging-in. Data recovery process For example view resource files, reading of glossary entries, etc.

These function were previously needed for limiting of access of special accounts. Database training It is usually not necessary any more, because any write or risky capabilities are now automatically prevented in has_capability().

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