PHPIndex

<?php

/**
 * Exceptions related to configuration schema
 */
class HTMLPurifier_ConfigSchema_Exception extends HTMLPurifier_Exception
{

}

// vim: et sw=4 sts=4

<?php

/**
 * Generic schema interchange format that can be converted to a runtime
 * representation (HTMLPurifier_ConfigSchema) or HTML documentation. Members
 * are completely validated.
 */
class HTMLPurifier_ConfigSchema_Interchange
{

    /**
     * Name of the application this schema is describing.
     * @type string
     */
    public $name;

    /**
     * Array of Directive ID => array(directive info)
     * @type HTMLPurifier_ConfigSchema_Interchange_Directive[]
     */
    public $directives = array();

    /**
     * Adds a directive array to $directives
     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $directive
     * @throws HTMLPurifier_ConfigSchema_Exception
     */
    public function addDirective($directive)
    {
        if (isset($this->directives[$i = $directive->id->toString()])) {
            throw new HTMLPurifier_ConfigSchema_Exception("Cannot redefine directive '$i'");
        }
        $this->directives[$i] = $directive;
    }

    /**
     * Convenience function to perform standard validation. Throws exception
     * on failed validation.
     */
    public function validate()
    {
        $validator = new HTMLPurifier_ConfigSchema_Validator();
        return $validator->validate($this);
    }
}

// vim: et sw=4 sts=4

<?php

class HTMLPurifier_ConfigSchema_InterchangeBuilder
{

    /**
     * Used for processing DEFAULT, nothing else.
     * @type HTMLPurifier_VarParser
     */
    protected $varParser;

    /**
     * @param HTMLPurifier_VarParser $varParser
     */
    public function __construct($varParser = null)
    {
        $this->varParser = $varParser ? $varParser : new HTMLPurifier_VarParser_Native();
    }

    /**
     * @param string $dir
     * @return HTMLPurifier_ConfigSchema_Interchange
     */
    public static function buildFromDirectory($dir = null)
    {
        $builder = new HTMLPurifier_ConfigSchema_InterchangeBuilder();
        $interchange = new HTMLPurifier_ConfigSchema_Interchange();
        return $builder->buildDir($interchange, $dir);
    }

    /**
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
     * @param string $dir
     * @return HTMLPurifier_ConfigSchema_Interchange
     */
    public function buildDir($interchange, $dir = null)
    {
        if (!$dir) {
            $dir = HTMLPURIFIER_PREFIX . '/HTMLPurifier/ConfigSchema/schema';
        }
        if (file_exists($dir . '/info.ini')) {
            $info = parse_ini_file($dir . '/info.ini');
            $interchange->name = $info['name'];
        }

        $files = array();
        $dh = opendir($dir);
        while (false !== ($file = readdir($dh))) {
            if (!$file || $file[0] == '.' || strrchr($file, '.') !== '.txt') {
                continue;
            }
            $files[] = $file;
        }
        closedir($dh);

        sort($files);
        foreach ($files as $file) {
            $this->buildFile($interchange, $dir . '/' . $file);
        }
        return $interchange;
    }

    /**
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
     * @param string $file
     */
    public function buildFile($interchange, $file)
    {
        $parser = new HTMLPurifier_StringHashParser();
        $this->build(
            $interchange,
            new HTMLPurifier_StringHash($parser->parseFile($file))
        );
    }

    /**
     * Builds an interchange object based on a hash.
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange HTMLPurifier_ConfigSchema_Interchange object to build
     * @param HTMLPurifier_StringHash $hash source data
     * @throws HTMLPurifier_ConfigSchema_Exception
     */
    public function build($interchange, $hash)
    {
        if (!$hash instanceof HTMLPurifier_StringHash) {
            $hash = new HTMLPurifier_StringHash($hash);
        }
        if (!isset($hash['ID'])) {
            throw new HTMLPurifier_ConfigSchema_Exception('Hash does not have any ID');
        }
        if (strpos($hash['ID'], '.') === false) {
            if (count($hash) == 2 && isset($hash['DESCRIPTION'])) {
                $hash->offsetGet('DESCRIPTION'); // prevent complaining
            } else {
                throw new HTMLPurifier_ConfigSchema_Exception('All directives must have a namespace');
            }
        } else {
            $this->buildDirective($interchange, $hash);
        }
        $this->_findUnused($hash);
    }

    /**
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
     * @param HTMLPurifier_StringHash $hash
     * @throws HTMLPurifier_ConfigSchema_Exception
     */
    public function buildDirective($interchange, $hash)
    {
        $directive = new HTMLPurifier_ConfigSchema_Interchange_Directive();

        // These are required elements:
        $directive->id = $this->id($hash->offsetGet('ID'));
        $id = $directive->id->toString(); // convenience

        if (isset($hash['TYPE'])) {
            $type = explode('/', $hash->offsetGet('TYPE'));
            if (isset($type[1])) {
                $directive->typeAllowsNull = true;
            }
            $directive->type = $type[0];
        } else {
            throw new HTMLPurifier_ConfigSchema_Exception("TYPE in directive hash '$id' not defined");
        }

        if (isset($hash['DEFAULT'])) {
            try {
                $directive->default = $this->varParser->parse(
                    $hash->offsetGet('DEFAULT'),
                    $directive->type,
                    $directive->typeAllowsNull
                );
            } catch (HTMLPurifier_VarParserException $e) {
                throw new HTMLPurifier_ConfigSchema_Exception($e->getMessage() . " in DEFAULT in directive hash '$id'");
            }
        }

        if (isset($hash['DESCRIPTION'])) {
            $directive->description = $hash->offsetGet('DESCRIPTION');
        }

        if (isset($hash['ALLOWED'])) {
            $directive->allowed = $this->lookup($this->evalArray($hash->offsetGet('ALLOWED')));
        }

        if (isset($hash['VALUE-ALIASES'])) {
            $directive->valueAliases = $this->evalArray($hash->offsetGet('VALUE-ALIASES'));
        }

        if (isset($hash['ALIASES'])) {
            $raw_aliases = trim($hash->offsetGet('ALIASES'));
            $aliases = preg_split('/\s*,\s*/', $raw_aliases);
            foreach ($aliases as $alias) {
                $directive->aliases[] = $this->id($alias);
            }
        }

        if (isset($hash['VERSION'])) {
            $directive->version = $hash->offsetGet('VERSION');
        }

        if (isset($hash['DEPRECATED-USE'])) {
            $directive->deprecatedUse = $this->id($hash->offsetGet('DEPRECATED-USE'));
        }

        if (isset($hash['DEPRECATED-VERSION'])) {
            $directive->deprecatedVersion = $hash->offsetGet('DEPRECATED-VERSION');
        }

        if (isset($hash['EXTERNAL'])) {
            $directive->external = preg_split('/\s*,\s*/', trim($hash->offsetGet('EXTERNAL')));
        }

        $interchange->addDirective($directive);
    }

    /**
     * Evaluates an array PHP code string without array() wrapper
     * @param string $contents
     */
    protected function evalArray($contents)
    {
        return eval('return array(' . $contents . ');');
    }

    /**
     * Converts an array list into a lookup array.
     * @param array $array
     * @return array
     */
    protected function lookup($array)
    {
        $ret = array();
        foreach ($array as $val) {
            $ret[$val] = true;
        }
        return $ret;
    }

    /**
     * Convenience function that creates an HTMLPurifier_ConfigSchema_Interchange_Id
     * object based on a string Id.
     * @param string $id
     * @return HTMLPurifier_ConfigSchema_Interchange_Id
     */
    protected function id($id)
    {
        return HTMLPurifier_ConfigSchema_Interchange_Id::make($id);
    }

    /**
     * Triggers errors for any unused keys passed in the hash; such keys
     * may indicate typos, missing values, etc.
     * @param HTMLPurifier_StringHash $hash Hash to check.
     */
    protected function _findUnused($hash)
    {
        $accessed = $hash->getAccessed();
        foreach ($hash as $k => $v) {
            if (!isset($accessed[$k])) {
                trigger_error("String hash key '$k' not used by builder", E_USER_NOTICE);
            }
        }
    }
}

// vim: et sw=4 sts=4

<?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

<?php

/**
 * Fluent interface for validating the contents of member variables.
 * This should be immutable. See HTMLPurifier_ConfigSchema_Validator for
 * use-cases. We name this an 'atom' because it's ONLY for validations that
 * are independent and usually scalar.
 */
class HTMLPurifier_ConfigSchema_ValidatorAtom
{
    /**
     * @type string
     */
    protected $context;

    /**
     * @type object
     */
    protected $obj;

    /**
     * @type string
     */
    protected $member;

    /**
     * @type mixed
     */
    protected $contents;

    public function __construct($context, $obj, $member)
    {
        $this->context = $context;
        $this->obj = $obj;
        $this->member = $member;
        $this->contents =& $obj->$member;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertIsString()
    {
        if (!is_string($this->contents)) {
            $this->error('must be a string');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertIsBool()
    {
        if (!is_bool($this->contents)) {
            $this->error('must be a boolean');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertIsArray()
    {
        if (!is_array($this->contents)) {
            $this->error('must be an array');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertNotNull()
    {
        if ($this->contents === null) {
            $this->error('must not be null');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertAlnum()
    {
        $this->assertIsString();
        if (!ctype_alnum($this->contents)) {
            $this->error('must be alphanumeric');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertNotEmpty()
    {
        if (empty($this->contents)) {
            $this->error('must not be empty');
        }
        return $this;
    }

    /**
     * @return HTMLPurifier_ConfigSchema_ValidatorAtom
     */
    public function assertIsLookup()
    {
        $this->assertIsArray();
        foreach ($this->contents as $v) {
            if ($v !== true) {
                $this->error('must be a lookup array');
            }
        }
        return $this;
    }

    /**
     * @param string $msg
     * @throws HTMLPurifier_ConfigSchema_Exception
     */
    protected function error($msg)
    {
        throw new HTMLPurifier_ConfigSchema_Exception(ucfirst($this->member) . ' in ' . $this->context . ' ' . $msg);
    }
}

// vim: et sw=4 sts=4

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