Notes on use of $TWiki::Plugins::VERSION (from 1.2 forwards):

• If the major version (e.g. 1.) is the same then any plugin coded to use any earlier revision of the 1. API will still work. No function has been removed from the interface, nor has any API published in that version changed in such a way as to require plugins to be recoded.
• If the minor version (e.g. 1.1) is incremented there may be changes in the API that may help improve the coding of some plugins - for example, new interfaces giving access to previously hidden core functions. In addition, deprecation of functions in the interface trigger a minor version increment. Note that deprecated functions are not removed, they are merely frozen, and plugin authors are recommended to stop using them.
• Any additional digits in the version number relate to minor changes, such as the addition of parameters to the existing functions, or addition of utility functions that are unlikely to require significant changes to existing plugins.
• TWiki::Plugins::VERSION also applies to the plugin handlers. The handlers are documented in the EmptyPlugin, and that module indicates what version of TWiki::Plugins::VERSION it relates to.

• ... - an arbitrary number of name=>value parameter pairs that will be url-encoded and added to the url. The special parameter name '#' is reserved for specifying an anchor. e.g. getScriptUrl('x','y','view','#'=>'XXX',a=>1,b=>2) will give .../view/x/y?a=1&b=2#XXX

getPubUrlPath( ) -> $path

getExternalResource( $url ) -> $response

Note that the $url may have an optional user and password, as specified by the relevant RFC. Any proxy set in configure is honoured.

The $response is an object that is known to implement the following subset of the methods of LWP::Response. It may in fact be an LWP::Response object, but it may also not be if LWP is not available, so callers may only assume the following subset of methods is available:

code()

message()

header($field)

content()

is_error()

is_redirect()

Note that if LWP is not available, this function:

1. can only really be trusted for HTTP/1.0 urls. If HTTP/1.1 or another protocol is required, you are strongly recommended to require LWP.
2. Will not parse multipart content

In the event of the server returning an error, then is_error() will return true, code() will return a valid HTTP status code as specified in RFC 2616 and RFC 2518, and message() will return the message that was received from the server. In the event of a client-side error (e.g. an unparseable URL) then is_error() will return true and message() will return an explanatory message. code() will return 400 (BAD REQUEST).

my $response = TWiki::Func::getExternalResource($url);
if (!$response->is_error() && $response->isa('HTTP::Response')) {
    ... other methods of HTTP::Response may be called
} else {
    ... only the methods listed above may be called
}

getSessionKeys() -> @keys

Session keys are stored and retrieved using setSessionValue and getSessionValue.

Since: TWiki::Plugins::VERSION 1.2

pushTopicContext($web, $topic)

• $web - new web
• $topic - new topic

It is the duty of the caller to restore the original context by calling popTopicContext.

Note that this call does not re-initialise plugins, so if you have used global variables to remember the web and topic in initPlugin, then those values will be unchanged.

Since: TWiki::Plugins::VERSION 1.2

popTopicContext()

Returns the TWiki context to the state it was in before the pushTopicContext was called.

Since: TWiki::Plugins::VERSION 1.2

setPreferencesValue($name, $val)

Set the preferences value so that future calls to getPreferencesValue will return this value, and %$name% will expand to the preference when used in future variable expansions.

The preference only persists for the rest of this request. Finalised preferences cannot be redefined using this function.

Returns 1 if the preference was defined, and 0 otherwise.

getCanonicalUserID( $user ) -> $cUID

If $user is undefined Get the cUID of logged in user, and will generally be 'BaseUserMapping_666'

• $user can be a cUID, login, wikiname or web.wikiname

Return: $cUID an internal unique and transportable escaped identifier for registered users (they can be autogenerated for an authenticated but unregistered user)

getWikiName( $user ) -> $wikiName

return the WikiName of the specified user if $user is undefined Get Wiki name of logged in user

• $user can be a cUID, login, wikiname or web.wikiname

getWikiUserName( $user ) -> $wikiName

return the userWeb.WikiName of the specified user if $user is undefined Get Wiki name of logged in user

• $user can be a cUID, login, wikiname or web.wikiname

Note that it is possible for several login names to map to the same wikiname. This function will only return the first login name that maps to the wikiname.

returns undef if the WikiName is not found.

emailToWikiNames( $email, $dontAddWeb ) -> @wikiNames

• $email - email address to look up
• $dontAddWeb - Do not add web prefix if "1"

Since: TWiki::Plugins::VERSION 1.2

wikiNameToEmails( $wikiname ) -> @emails

• $wikiname - wikiname of user to look up

Since: TWiki::Plugins::VERSION 1.2

isAnAdmin( $login ) -> $boolean

• $login can be either a login, or a CUID

isGroupMember( $group, $login ) -> $boolean

Find out if $login is in the named group. e.g.

if( TWiki::Func::isGroupMember( "HesperionXXGroup", "jordi" )) {
    ...
}

• $login can be a login name, or a cUID, or WikiName

Since: TWiki::Plugins::VERSION 1.2

eachUser() -> $iterator

Use it as follows:

    my $iterator = TWiki::Func::eachUser();
    while ($it->hasNext()) {
        my $user = $it->next();
        # $user is a wikiname
    }

WARNING on large sites, this could be a long list!

Since: TWiki::Plugins::VERSION 1.2

eachMembership($wikiname) -> $iterator

Since: TWiki::Plugins::VERSION 1.2

eachGroup() -> $iterator

Use it as follows:

    my $iterator = TWiki::Func::eachGroup();
    while ($it->hasNext()) {
        my $group = $it->next();
        # $group is a group name e.g. TWikiAdminGroup
    }

WARNING on large sites, this could be a long list!

Since: TWiki::Plugins::VERSION 1.2

isGroup( $group ) -> $boolean

Checks if $group is the name of a group known to TWiki.

eachGroupMember($group) -> $iterator

Use it as follows:

    my $iterator = TWiki::Func::eachGroupMember('RadioheadGroup');
    while ($it->hasNext()) {
        my $user = $it->next();
        # $user is a wiki name e.g. 'TomYorke', 'PhilSelway'
    }

WARNING on large sites, this could be a long list!

Since: TWiki::Plugins::VERSION 1.2

eachChangeSince($web, $time) -> $iterator

Get an iterator over the list of all the changes in the given web between $time and now. $time is a time in seconds since 1st Jan 1970, and is not guaranteed to return any changes that occurred before (now - {Store}{RememberChangesFor}). {Store}{RememberChangesFor}) is a setting in configure. Changes are returned in most-recent-first order.

Use it as follows:

    my $iterator = TWiki::Func::eachChangeSince(
        $web, time() - 7 * 24 * 60 * 60); # the last 7 days
    while ($it->hasNext()) {
        my $change = $it->next();
        # $change is a perl hash that contains the following fields:
        # topic => topic name
        # user => wikiname - wikiname of user who made the change
        # time => time of the change
        # revision => revision number *after* the change
        # more => more info about the change (e.g. 'minor')
    }

• $lock 1 to lease the topic, 0 to clear an existing lease

• $query - CGI query object. If not given, the default CGI query will be used (optional, in most cases you should not pass this parameter)
• $contentLength - Length of content (optional, in most cases you should not pass this parameter)

expandCommonVariables( $text, $topic, $web, $meta ) -> $text

• $meta - topic meta-data to use while expanding (Since TWiki::Plugins::VERSION 1.2)

decodeFormatTokens($str) -> $unencodedString

TWiki has an informal standard set of tokens used in format parameters that are used to block evaluation of paramater strings. For example, if you were to write

%MYTAG{format="%WURBLE%"}%

then %WURBLE would be expanded before %MYTAG is evaluated. To avoid this TWiki uses escapes in the format string. For example:

%MYTAG{format="$percntWURBLE$percnt"}%

This lets you enter arbitrary strings into parameters without worrying that TWiki will expand them before your plugin gets a chance to deal with them properly. Once you have processed your tag, you will want to expand these tokens to their proper value. That's what this function does.

Escape:	Expands To:
$n or $n()	New line. Use $n() if followed by alphanumeric character, e.g. write Foo$n()Bar instead of Foo$nBar
$nop or $nop()	Is a "no operation".
$quot	Double quote (")
$percnt	Percent sign (%)
$dollar	Dollar sign ($)

Note thath $quot, $percnt and $dollar all work *even if they are followed by alphanumeric characters*. You have been warned!

Since: TWiki::Plugins::VERSION 1.2

StaticMethod *sanitizeAttachmentName ($fname) -> ($fileName,$origName)

Given a file namer, sanitise it according to the rules for transforming attachment names. Returns the sanitised name together with the basename before sanitisation.

Sanitation includes filtering illegal characters and mapping client file names to legal server names.

Since: TWiki::Plugins::VERSION 1.2

spaceOutWikiWord( $word, $sep ) -> $text

Spaces out a wiki word by inserting a string (default: one space) between each word component. With parameter $sep any string may be used as separator between the word components; if $sep is undefined it defaults to a space.

Since: TWiki::Plugins::VERSION 1.2

isTrue( $value, $default ) -> $boolean

Returns 1 if $value is true, and 0 otherwise. "true" means set to something with a Perl true value, with the special cases that "off", "false" and "no" (case insensitive) are forced to false. Leading and trailing spaces in $value are ignored.

If the value is undef, then $default is returned. If $default is not specified it is taken as 0.

Since: $TWiki::Plugins::VERSION 1.2

getOopsUrl( $web, $topic, $template, $param1, $param2, $param3, $param4 ) -> $url

Compose fully qualified 'oops' dialog URL

• $web - Web name, e.g. 'Main'. The current web is taken if empty
• $topic - Topic name, e.g. 'WebNotify'
• $template - Oops template name, e.g. 'oopsmistake'. The 'oops' is optional; 'mistake' will translate to 'oopsmistake'.
• $param1 ... $param4 - Parameter values for %PARAM1% ... %PARAMn% variables in template, optional

DEPRECATED since 1.1, the recommended approach is to throw an oops exception.

   use Error qw( :try );

   throw TWiki::OopsException(
      'toestuckerror',
      web => $web,
      topic => $topic,
      params => [ 'I got my toe stuck' ]);

If this is not possible (e.g. in a REST handler that does not trap the exception) then you can use getScriptUrl instead:

   my $url = TWiki::Func::getScriptUrl($web, $topic, 'oops',
            template => 'oopstoestuckerror',
            param1 => 'I got my toe stuck');
   TWiki::Func::redirectCgiQuery( undef, $url );
   return 0;

Since: TWiki::Plugins::VERSION 1.000 (7 Dec 2002)

permissionsSet( $web ) -> $boolean

Test if any access restrictions are set for this web, ignoring settings on individual pages

• $web - Web name, required, e.g. 'Sandbox'

Since: TWiki::Plugins::VERSION 1.000 (27 Feb 2001)

DEPRECATED since 1.2 - use getPreferencesValue instead to determine what permissions are set on the web, for example:

foreach my $type qw( ALLOW DENY ) {
    foreach my $action qw( CHANGE VIEW ) {
        my $pref = $type . 'WEB' . $action;
        my $val = getPreferencesValue( $pref, $web ) || '';
        if( $val =~ /\S/ ) {
            print "$pref is set to $val on $web\n";
        }
    }
}