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