internal package Foswiki::UserMapping

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internal package Foswiki::UserMapping

This is a virtual base class (a.k.a an interface) for all user mappers. It is not useable as a mapping in Foswiki - use the BaseUserMapping for default behaviour.

User mapping is the process by which Foswiki maps from a username (a login name) to a display name and back. It is also where groups are maintained.

See Foswiki::Users::BaseUserMapping and Foswiki::Users::TopicUserMapping for the default implementations of this interface.

If you want to write a user mapper, you will need to implement the methods described in this class.

User mappings work by mapping both login names and display names to a canonical user id. This user id is composed from a prefix that defines the mapper in use (something like 'BaseUserMapping_' or 'LdapUserMapping_') and a unique user id that the mapper uses to identify the user.

The null prefix is reserver for the TopicUserMapping for compatibility with old Foswiki releases.

Note: in all the following documentation, $cUID refers to a canonical user id.

PROTECTED ClassMethod new ($session, $mapping_id)

Construct a user mapping object, using the given mapping id.

ObjectMethod finish()

Break circular references.

ObjectMethod loginTemplateName () → $templateFile

Allows UserMappings to come with customised login screens - that should preferably only over-ride the UI function

Default is "login"

ObjectMethod supportsRegistration() → $boolean

Return true if the UserMapper supports registration (ie can create new users)

Default is false

ObjectMethod handlesUser ( $cUID, $login, $wikiname) → $boolean

Called by the Foswiki::Users object to determine which loaded mapping to use for a given user (must be fast).

The user can be identified by any of $cUID, $login or $wikiname. Any of these parameters may be undef, and they should be tested in order; cUID first, then login, then wikiname.

ObjectMethod login2cUID($login, $dontcheck) → cUID

Convert a login name to the corresponding canonical user name. The canonical name can be any string of 7-bit alphanumeric and underscore characters, and must map 1:1 to the login name. (undef on failure)

(if $dontcheck is true, return a cUID for a nonexistant user too. This is used for registration)

Subclasses must implement this method.

Note: This method was previously (in TWiki 4.2.0) known as getCanonicalUserID. The name was changed to avoid confusion with Foswiki::Users::getCanonicalUserID, which has a more generic function. However to support older user mappers, getCanonicalUserID will still be called if login2cUID is not defined.

ObjectMethod getLoginName ($cUID) → login

Converts an internal cUID to that user's login (undef on failure)

Subclasses must implement this method.

ObjectMethod addUser ($login, $wikiname, $password, $emails) → $cUID

Add a user to the persistent mapping that maps from usernames to wikinames and vice-versa.

$login and $wikiname must be acceptable to $Foswiki::cfg{NameFilter}. $login must always be specified. $wikiname may be undef, in which case the user mapper should make one up.

This function must return a canonical user id that it uses to uniquely identify the user. This can be the login name, or the wikiname if they are all guaranteed unigue, or some other string consisting only of 7-bit alphanumerics and underscores.

If you fail to create a new user (for eg your Mapper has read only access),

    throw Error::Simple('Failed to add user: '.$error);

where $error is a descriptive string.

Throws an Error::Simple if user adding is not supported (the default).

ObjectMethod removeUser( $cUID ) → $boolean

Delete the users entry from this mapper. Throws an Error::Simple if user removal is not supported (the default).

ObjectMethod getWikiName ($cUID) → $wikiname

Map a canonical user name to a wikiname.

Returns the $cUID by default.

ObjectMethod userExists($cUID) → $boolean

Determine if the user already exists or not. Whether a user exists or not is determined by the password manager.

Subclasses must implement this method.

ObjectMethod eachUser () → $iterator

Get an iterator over the list of all cUIDs of the registered users not including groups.

Subclasses must implement this method.

ObjectMethod eachGroupMember ($group, $expand) → $iterator

Return a iterator over the canonical user ids of users that are members of this group. Should only be called on groups.

Note that groups may be defined recursively, so a group may contain other groups. Unless $expand is set to false, this method should only return users i.e. all contained groups should be fully expanded.

Subclasses must implement this method.

ObjectMethod isGroup ($name) → boolean

Establish if a user refers to a group or not. If $name is not a group name it will probably be a canonical user id, though that should not be assumed.

Subclasses must implement this method.

ObjectMethod eachGroup () → $iterator

Get an iterator over the list of all the group names.

Subclasses must implement this method.

ObjectMethod eachMembership($cUID) → $iterator

Return an iterator over the names of groups that $cUID is a member of.

Subclasses must implement this method.

ObjectMethod groupAllowsView($group) → boolean

returns 1 if the group is able to be viewed by the current logged in user

ObjectMethod groupAllowsChange($group) → boolean

returns 1 if the group is able to be modified by the current logged in user

ObjectMethod addToGroup( $cuid, $group, $create ) → $boolean

adds the user specified by the cuid to the group.

Mapper should throws Error::Simple if errors are encountered. For example, if the group does not exist, and the create flag is not supplied:

    throw Error::Simple( $this->{session}
        →i18n→maketext('Group does not exist and create not permitted')
    ) unless ($create);

ObjectMethod removeFromGroup( $cuid, $group ) → $boolean

Mapper should throws Error::Simple if errors are encountered. For example, if the user does not exist in the group:

   throw Error::Simple(
      $this->{session}->i18n→maketext(
         'User [_1] not in group, cannot be removed', $cuid
      )
   );

ObjectMethod isAdmin( $cUID ) → $boolean

True if the user is an administrator.

ObjectMethod isInGroup ($cUID, $group, $options ) → $bool

Test if the user identified by $cUID is in the given group. The default implementation iterates over all the members of $group, which is rather inefficient. $options is a hash array of options effecting the search. Available options are:

• expand => 1 0/1 - should nested groups be expanded when searching for the cUID? Default is 1 - expand nested groups

ObjectMethod findUserByEmail( $email ) → \@users

• $email - email address to look up

Return a list of canonical user names for the users that have this email registered with the password manager or the user mapping manager.

ObjectMethod getEmails($name) → @emailAddress

If $name is a cUID, return that user's email addresses. If it is a group, return the addresses of everyone in the group.

Duplicates should be removed from the list.

ObjectMethod setEmails($cUID, @emails)

Set the email address(es) for the given user.

ObjectMethod findUserByWikiName ($wikiname) → list of cUIDs associated with that wikiname

• $wikiname - wikiname to look up

Return a list of canonical user names for the users that have this wikiname. Since a single wikiname might be used by multiple login ids, we need a list.

Note that if $wikiname is the name of a group, the group will not be expanded.

Subclasses must implement this method.

ObjectMethod checkPassword( $login, $passwordU ) → $boolean

Finds if the password is valid for the given login. This is called using a login name rather than a cUID because the user may not have been mapped at the time it is called.

Returns 1 on success, undef on failure.

Default behaviour is to return 1.

ObjectMethod setPassword( $cUID, $newPassU, $oldPassU ) → $boolean

If the $oldPassU matches matches the user's password, then it will replace it with $newPassU.

If $oldPassU is not correct and not 1, will return 0.

If $oldPassU is 1, will force the change irrespective of the existing password, adding the user if necessary.

Otherwise returns 1 on success, undef on failure.

Default behaviour is to fail.

ObjectMethod passwordError( ) → $string

Returns a string indicating the error that happened in the password handlers TODO: these delayed errors should be replaced with Exceptions.

returns undef if no error (the default)

ObjectMethod validateRegistrationField($field, $value ) → $string

Returns a string containing the sanitized registration field, or can throw an oops if the field contains illegal data to block the registration.

returns the string unchanged if no issue found.