mirror of
https://github.com/ezyang/htmlpurifier.git
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b93892a3b6
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@436 48356398-32a2-884e-a903-53898d9a118a
337 lines
12 KiB
PHP
337 lines
12 KiB
PHP
<?php
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/**
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* Configuration definition, defines directives and their defaults.
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* @todo The ability to define things multiple times is confusing and should
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* be factored out to its own function named registerDependency() or
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* addNote(), where only the namespace.name and an extra descriptions
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* documenting the nature of the dependency are needed. Since it's
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* possible that the dependency is registered before the configuration
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* is defined, deferring it to some sort of cache until it actually
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* gets defined would be wise, keeping it opaque until it does get
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* defined. We could add a finalize() method which would cause it to
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* error out if we get a dangling dependency. It's difficult, however,
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* to know whether or not it's a dependency, or a codependency, that is
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* neither of them fully depends on it. Where does the configuration go
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* then? This could be partially resolved by allowing blanket definitions
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* and then splitting them up into finer-grained versions, however, there
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* might be implementation difficulties in ini files regarding order of
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* execution.
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*/
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class HTMLPurifier_ConfigSchema {
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/**
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* Defaults of the directives and namespaces.
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* @note This shares the exact same structure as HTMLPurifier_Config::$conf
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*/
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var $defaults = array();
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/**
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* Definition of the directives.
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*/
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var $info = array();
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/**
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* Definition of namespaces.
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*/
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var $info_namespace = array();
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/**
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* Lookup table of allowed types.
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*/
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var $types = array(
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'string' => 'String',
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'istring' => 'Case-insensitive string',
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'int' => 'Integer',
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'float' => 'Float',
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'bool' => 'Boolean',
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'lookup' => 'Lookup array',
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'list' => 'Array list',
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'hash' => 'Associative array',
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'mixed' => 'Mixed'
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);
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/**
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* Initializes the default namespaces.
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*/
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function initialize() {
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$this->defineNamespace('Core', 'Core features that are always available.');
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$this->defineNamespace('Attr', 'Features regarding attribute validation.');
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$this->defineNamespace('URI', 'Features regarding Uniform Resource Identifiers.');
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$this->defineNamespace('HTML', 'Configuration regarding allowed HTML.');
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$this->defineNamespace('CSS', 'Configuration regarding allowed CSS.');
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$this->defineNamespace('Test', 'Developer testing configuration for our unit tests.');
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}
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/**
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* Retrieves an instance of the application-wide configuration definition.
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*/
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function &instance($prototype = null) {
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static $instance;
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if ($prototype !== null) {
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$instance = $prototype;
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} elseif ($instance === null || $prototype === true) {
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$instance = new HTMLPurifier_ConfigSchema();
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$instance->initialize();
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}
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return $instance;
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}
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/**
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* Defines a directive for configuration
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* @warning Will fail of directive's namespace is defined
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* @param $namespace Namespace the directive is in
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* @param $name Key of directive
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* @param $default Default value of directive
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* @param $type Allowed type of the directive. See
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* HTMLPurifier_DirectiveDef::$type for allowed values
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* @param $description Description of directive for documentation
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*/
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function define(
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$namespace, $name, $default, $type,
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$description
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) {
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$def =& HTMLPurifier_ConfigSchema::instance();
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if (!isset($def->info[$namespace])) {
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trigger_error('Cannot define directive for undefined namespace',
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E_USER_ERROR);
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return;
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}
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if (!ctype_alnum($name)) {
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trigger_error('Directive name must be alphanumeric',
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E_USER_ERROR);
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return;
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}
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if (isset($def->info[$namespace][$name])) {
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if (
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$def->info[$namespace][$name]->type !== $type ||
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$def->defaults[$namespace][$name] !== $default
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) {
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trigger_error('Inconsistent default or type, cannot redefine');
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return;
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}
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} else {
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if (!isset($def->types[$type])) {
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trigger_error('Invalid type for configuration directive',
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E_USER_ERROR);
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return;
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}
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if ($def->validate($default, $type) === null) {
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trigger_error('Default value does not match directive type',
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E_USER_ERROR);
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return;
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}
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$def->info[$namespace][$name] =
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new HTMLPurifier_ConfigEntity_Directive();
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$def->info[$namespace][$name]->type = $type;
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$def->defaults[$namespace][$name] = $default;
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}
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$backtrace = debug_backtrace();
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$file = $def->mungeFilename($backtrace[0]['file']);
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$line = $backtrace[0]['line'];
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$def->info[$namespace][$name]->addDescription($file,$line,$description);
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}
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/**
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* Defines a namespace for directives to be put into.
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* @param $namespace Namespace's name
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* @param $description Description of the namespace
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*/
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function defineNamespace($namespace, $description) {
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$def =& HTMLPurifier_ConfigSchema::instance();
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if (isset($def->info[$namespace])) {
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trigger_error('Cannot redefine namespace', E_USER_ERROR);
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return;
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}
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if (!ctype_alnum($namespace)) {
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trigger_error('Namespace name must be alphanumeric',
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E_USER_ERROR);
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return;
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}
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$def->info[$namespace] = array();
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$def->info_namespace[$namespace] = new HTMLPurifier_ConfigEntity_Namespace();
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$def->info_namespace[$namespace]->description = $description;
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$def->defaults[$namespace] = array();
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}
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/**
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* Defines a directive value alias.
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*
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* Directive value aliases are convenient for developers because it lets
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* them set a directive to several values and get the same result.
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* @param $namespace Directive's namespace
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* @param $name Name of Directive
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* @param $alias Name of aliased value
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* @param $real Value aliased value will be converted into
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*/
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function defineValueAliases($namespace, $name, $aliases) {
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$def =& HTMLPurifier_ConfigSchema::instance();
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if (!isset($def->info[$namespace][$name])) {
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trigger_error('Cannot set value alias for non-existant directive',
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E_USER_ERROR);
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return;
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}
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foreach ($aliases as $alias => $real) {
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if (!$def->info[$namespace][$name] !== true &&
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!isset($def->info[$namespace][$name]->allowed[$real])
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) {
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trigger_error('Cannot define alias to value that is not allowed',
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E_USER_ERROR);
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return;
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}
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if (isset($def->info[$namespace][$name]->allowed[$alias])) {
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trigger_error('Cannot define alias over allowed value',
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E_USER_ERROR);
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return;
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}
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$def->info[$namespace][$name]->aliases[$alias] = $real;
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}
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}
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/**
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* Defines a set of allowed values for a directive.
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* @param $namespace Namespace of directive
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* @param $name Name of directive
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* @param $allowed_values Arraylist of allowed values
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*/
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function defineAllowedValues($namespace, $name, $allowed_values) {
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$def =& HTMLPurifier_ConfigSchema::instance();
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if (!isset($def->info[$namespace][$name])) {
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trigger_error('Cannot define allowed values for undefined directive',
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E_USER_ERROR);
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return;
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}
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if ($def->info[$namespace][$name]->allowed === true) {
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$def->info[$namespace][$name]->allowed = array();
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}
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foreach ($allowed_values as $value) {
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$def->info[$namespace][$name]->allowed[$value] = true;
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}
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}
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/**
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* Validate a variable according to type. Return null if invalid.
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*/
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function validate($var, $type) {
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if (!isset($this->types[$type])) {
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trigger_error('Invalid type', E_USER_ERROR);
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return;
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}
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switch ($type) {
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case 'mixed':
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return $var;
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case 'istring':
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case 'string':
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if (!is_string($var)) return;
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if ($type === 'istring') $var = strtolower($var);
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return $var;
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case 'int':
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if (is_string($var) && ctype_digit($var)) $var = (int) $var;
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elseif (!is_int($var)) return;
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return $var;
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case 'float':
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if (is_string($var) && is_numeric($var)) $var = (float) $var;
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elseif (!is_float($var)) return;
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return $var;
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case 'bool':
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if (is_int($var) && ($var === 0 || $var === 1)) {
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$var = (bool) $var;
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} elseif (!is_bool($var)) return;
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return $var;
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case 'list':
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case 'hash':
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case 'lookup':
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if (!is_array($var)) return;
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$keys = array_keys($var);
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if ($keys === array_keys($keys)) {
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if ($type == 'list') return $var;
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elseif ($type == 'lookup') {
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$new = array();
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foreach ($var as $key) {
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$new[$key] = true;
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}
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return $new;
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} else return;
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}
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if ($type === 'lookup') {
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foreach ($var as $key => $value) {
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$var[$key] = true;
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}
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}
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return $var;
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}
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}
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function mungeFilename($filename) {
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$offset = strrpos($filename, 'HTMLPurifier');
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$filename = substr($filename, $offset);
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$filename = str_replace('\\', '/', $filename);
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return $filename;
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}
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}
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/**
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* Base class for configuration entity
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*/
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class HTMLPurifier_ConfigEntity {}
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/**
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* Structure object describing of a namespace
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*/
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class HTMLPurifier_ConfigEntity_Namespace extends HTMLPurifier_ConfigEntity {
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/**
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* String description of what kinds of directives go in this namespace.
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*/
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var $description;
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}
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/**
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* Structure object containing definition of a directive.
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* @note This structure does not contain default values
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*/
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class HTMLPurifier_ConfigEntity_Directive extends HTMLPurifier_ConfigEntity
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{
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/**
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* Hash of value aliases, i.e. values that are equivalent.
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*/
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var $aliases = array();
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/**
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* Lookup table of allowed values of the element, bool true if all allowed.
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*/
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var $allowed = true;
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/**
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* Allowed type of the directive. Values are:
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* - string
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* - istring (case insensitive string)
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* - int
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* - float
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* - bool
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* - lookup (array of value => true)
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* - list (regular numbered index array)
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* - hash (array of key => value)
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* - mixed (anything goes)
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*/
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var $type = 'mixed';
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/**
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* Plaintext descriptions of the configuration entity is. Organized by
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* file and line number, so multiple descriptions are allowed.
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*/
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var $descriptions = array();
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/**
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* Adds a description to the array
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*/
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function addDescription($file, $line, $description) {
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if (!isset($this->descriptions[$file])) $this->descriptions[$file] = array();
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$this->descriptions[$file][$line] = $description;
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}
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}
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?>
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