249 lines
8.4 KiB
PHP
249 lines
8.4 KiB
PHP
<?php
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/**
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* Performs validations on HTMLPurifier_ConfigSchema_Interchange
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*
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* @note If you see '// handled by InterchangeBuilder', that means a
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* design decision in that class would prevent this validation from
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* ever being necessary. We have them anyway, however, for
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* redundancy.
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*/
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class HTMLPurifier_ConfigSchema_Validator
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{
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/**
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* @type HTMLPurifier_ConfigSchema_Interchange
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*/
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protected $interchange;
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/**
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* @type array
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*/
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protected $aliases;
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/**
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* Context-stack to provide easy to read error messages.
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* @type array
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*/
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protected $context = array();
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/**
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* to test default's type.
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* @type HTMLPurifier_VarParser
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*/
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protected $parser;
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public function __construct()
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{
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$this->parser = new HTMLPurifier_VarParser();
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}
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/**
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* Validates a fully-formed interchange object.
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* @param HTMLPurifier_ConfigSchema_Interchange $interchange
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* @return bool
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*/
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public function validate($interchange)
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{
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$this->interchange = $interchange;
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$this->aliases = array();
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// PHP is a bit lax with integer <=> string conversions in
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// arrays, so we don't use the identical !== comparison
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foreach ($interchange->directives as $i => $directive) {
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$id = $directive->id->toString();
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if ($i != $id) {
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$this->error(false, "Integrity violation: key '$i' does not match internal id '$id'");
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}
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$this->validateDirective($directive);
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}
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return true;
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}
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/**
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* Validates a HTMLPurifier_ConfigSchema_Interchange_Id object.
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* @param HTMLPurifier_ConfigSchema_Interchange_Id $id
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*/
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public function validateId($id)
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{
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$id_string = $id->toString();
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$this->context[] = "id '$id_string'";
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if (!$id instanceof HTMLPurifier_ConfigSchema_Interchange_Id) {
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// handled by InterchangeBuilder
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$this->error(false, 'is not an instance of HTMLPurifier_ConfigSchema_Interchange_Id');
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}
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// keys are now unconstrained (we might want to narrow down to A-Za-z0-9.)
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// we probably should check that it has at least one namespace
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$this->with($id, 'key')
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->assertNotEmpty()
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->assertIsString(); // implicit assertIsString handled by InterchangeBuilder
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array_pop($this->context);
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}
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/**
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* Validates a HTMLPurifier_ConfigSchema_Interchange_Directive object.
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* @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
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*/
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public function validateDirective($d)
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{
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$id = $d->id->toString();
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$this->context[] = "directive '$id'";
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$this->validateId($d->id);
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$this->with($d, 'description')
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->assertNotEmpty();
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// BEGIN - handled by InterchangeBuilder
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$this->with($d, 'type')
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->assertNotEmpty();
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$this->with($d, 'typeAllowsNull')
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->assertIsBool();
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try {
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// This also tests validity of $d->type
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$this->parser->parse($d->default, $d->type, $d->typeAllowsNull);
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} catch (HTMLPurifier_VarParserException $e) {
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$this->error('default', 'had error: ' . $e->getMessage());
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}
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// END - handled by InterchangeBuilder
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if (!is_null($d->allowed) || !empty($d->valueAliases)) {
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// allowed and valueAliases require that we be dealing with
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// strings, so check for that early.
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$d_int = HTMLPurifier_VarParser::$types[$d->type];
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if (!isset(HTMLPurifier_VarParser::$stringTypes[$d_int])) {
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$this->error('type', 'must be a string type when used with allowed or value aliases');
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}
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}
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$this->validateDirectiveAllowed($d);
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$this->validateDirectiveValueAliases($d);
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$this->validateDirectiveAliases($d);
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array_pop($this->context);
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}
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/**
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* Extra validation if $allowed member variable of
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* HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
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* @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
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*/
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public function validateDirectiveAllowed($d)
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{
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if (is_null($d->allowed)) {
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return;
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}
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$this->with($d, 'allowed')
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->assertNotEmpty()
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->assertIsLookup(); // handled by InterchangeBuilder
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if (is_string($d->default) && !isset($d->allowed[$d->default])) {
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$this->error('default', 'must be an allowed value');
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}
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$this->context[] = 'allowed';
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foreach ($d->allowed as $val => $x) {
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if (!is_string($val)) {
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$this->error("value $val", 'must be a string');
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}
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}
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array_pop($this->context);
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}
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/**
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* Extra validation if $valueAliases member variable of
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* HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
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* @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
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*/
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public function validateDirectiveValueAliases($d)
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{
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if (is_null($d->valueAliases)) {
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return;
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}
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$this->with($d, 'valueAliases')
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->assertIsArray(); // handled by InterchangeBuilder
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$this->context[] = 'valueAliases';
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foreach ($d->valueAliases as $alias => $real) {
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if (!is_string($alias)) {
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$this->error("alias $alias", 'must be a string');
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}
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if (!is_string($real)) {
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$this->error("alias target $real from alias '$alias'", 'must be a string');
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}
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if ($alias === $real) {
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$this->error("alias '$alias'", "must not be an alias to itself");
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}
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}
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if (!is_null($d->allowed)) {
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foreach ($d->valueAliases as $alias => $real) {
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if (isset($d->allowed[$alias])) {
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$this->error("alias '$alias'", 'must not be an allowed value');
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} elseif (!isset($d->allowed[$real])) {
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$this->error("alias '$alias'", 'must be an alias to an allowed value');
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}
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}
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}
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array_pop($this->context);
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}
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/**
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* Extra validation if $aliases member variable of
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* HTMLPurifier_ConfigSchema_Interchange_Directive is defined.
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* @param HTMLPurifier_ConfigSchema_Interchange_Directive $d
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*/
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public function validateDirectiveAliases($d)
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{
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$this->with($d, 'aliases')
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->assertIsArray(); // handled by InterchangeBuilder
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$this->context[] = 'aliases';
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foreach ($d->aliases as $alias) {
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$this->validateId($alias);
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$s = $alias->toString();
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if (isset($this->interchange->directives[$s])) {
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$this->error("alias '$s'", 'collides with another directive');
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}
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if (isset($this->aliases[$s])) {
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$other_directive = $this->aliases[$s];
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$this->error("alias '$s'", "collides with alias for directive '$other_directive'");
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}
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$this->aliases[$s] = $d->id->toString();
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}
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array_pop($this->context);
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}
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// protected helper functions
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/**
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* Convenience function for generating HTMLPurifier_ConfigSchema_ValidatorAtom
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* for validating simple member variables of objects.
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* @param $obj
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* @param $member
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* @return HTMLPurifier_ConfigSchema_ValidatorAtom
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*/
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protected function with($obj, $member)
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{
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return new HTMLPurifier_ConfigSchema_ValidatorAtom($this->getFormattedContext(), $obj, $member);
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}
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/**
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* Emits an error, providing helpful context.
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* @throws HTMLPurifier_ConfigSchema_Exception
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*/
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protected function error($target, $msg)
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{
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if ($target !== false) {
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$prefix = ucfirst($target) . ' in ' . $this->getFormattedContext();
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} else {
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$prefix = ucfirst($this->getFormattedContext());
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}
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throw new HTMLPurifier_ConfigSchema_Exception(trim($prefix . ' ' . $msg));
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}
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/**
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* Returns a formatted context string.
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* @return string
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*/
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protected function getFormattedContext()
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{
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return implode(' in ', array_reverse($this->context));
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}
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}
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// vim: et sw=4 sts=4
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