Replace existing autoloader with Composer-supplied

- Move Friendica namespace to `src`
- Move required `ezyang/htmlpurifier` to vendor
- Remove existing static autoloader
- Change boot.php reference to the autoloader

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Bool.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Validates a boolean attribute
+ */
+class HTMLPurifier_AttrDef_HTML_Bool extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type bool
+     */
+    protected $name;
+
+    /**
+     * @type bool
+     */
+    public $minimized = true;
+
+    /**
+     * @param bool $name
+     */
+    public function __construct($name = false)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $string Name of attribute
+     * @return HTMLPurifier_AttrDef_HTML_Bool
+     */
+    public function make($string)
+    {
+        return new HTMLPurifier_AttrDef_HTML_Bool($string);
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Class.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * Implements special behavior for class attribute (normally NMTOKENS)
+ */
+class HTMLPurifier_AttrDef_HTML_Class extends HTMLPurifier_AttrDef_HTML_Nmtokens
+{
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    protected function split($string, $config, $context)
+    {
+        // really, this twiddle should be lazy loaded
+        $name = $config->getDefinition('HTML')->doctype->name;
+        if ($name == "XHTML 1.1" || $name == "XHTML 2.0") {
+            return parent::split($string, $config, $context);
+        } else {
+            return preg_split('/\s+/', $string);
+        }
+    }
+
+    /**
+     * @param array $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function filter($tokens, $config, $context)
+    {
+        $allowed = $config->get('Attr.AllowedClasses');
+        $forbidden = $config->get('Attr.ForbiddenClasses');
+        $ret = array();
+        foreach ($tokens as $token) {
+            if (($allowed === null || isset($allowed[$token])) &&
+                !isset($forbidden[$token]) &&
+                // We need this O(n) check because of PHP's array
+                // implementation that casts -0 to 0.
+                !in_array($token, $ret, true)
+            ) {
+                $ret[] = $token;
+            }
+        }
+        return $ret;
+    }
+}

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Color.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Validates a color according to the HTML spec.
+ */
+class HTMLPurifier_AttrDef_HTML_Color extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        static $colors = null;
+        if ($colors === null) {
+            $colors = $config->get('Core.ColorKeywords');
+        }
+
+        $string = trim($string);
+
+        if (empty($string)) {
+            return false;
+        }
+        $lower = strtolower($string);
+        if (isset($colors[$lower])) {
+            return $colors[$lower];
+        }
+        if ($string[0] === '#') {
+            $hex = substr($string, 1);
+        } else {
+            $hex = $string;
+        }
+
+        $length = strlen($hex);
+        if ($length !== 3 && $length !== 6) {
+            return false;
+        }
+        if (!ctype_xdigit($hex)) {
+            return false;
+        }
+        if ($length === 3) {
+            $hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
+        }
+        return "#$hex";
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/FrameTarget.php

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * Special-case enum attribute definition that lazy loads allowed frame targets
+ */
+class HTMLPurifier_AttrDef_HTML_FrameTarget extends HTMLPurifier_AttrDef_Enum
+{
+
+    /**
+     * @type array
+     */
+    public $valid_values = false; // uninitialized value
+
+    /**
+     * @type bool
+     */
+    protected $case_sensitive = false;
+
+    public function __construct()
+    {
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        if ($this->valid_values === false) {
+            $this->valid_values = $config->get('Attr.AllowedFrameTargets');
+        }
+        return parent::validate($string, $config, $context);
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/ID.php

@@ -0,0 +1,105 @@
+<?php
+
+/**
+ * Validates the HTML attribute ID.
+ * @warning Even though this is the id processor, it
+ *          will ignore the directive Attr:IDBlacklist, since it will only
+ *          go according to the ID accumulator. Since the accumulator is
+ *          automatically generated, it will have already absorbed the
+ *          blacklist. If you're hacking around, make sure you use load()!
+ */
+
+class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
+{
+
+    // selector is NOT a valid thing to use for IDREFs, because IDREFs
+    // *must* target IDs that exist, whereas selector #ids do not.
+
+    /**
+     * Determines whether or not we're validating an ID in a CSS
+     * selector context.
+     * @type bool
+     */
+    protected $selector;
+
+    /**
+     * @param bool $selector
+     */
+    public function __construct($selector = false)
+    {
+        $this->selector = $selector;
+    }
+
+    /**
+     * @param string $id
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($id, $config, $context)
+    {
+        if (!$this->selector && !$config->get('Attr.EnableID')) {
+            return false;
+        }
+
+        $id = trim($id); // trim it first
+
+        if ($id === '') {
+            return false;
+        }
+
+        $prefix = $config->get('Attr.IDPrefix');
+        if ($prefix !== '') {
+            $prefix .= $config->get('Attr.IDPrefixLocal');
+            // prevent re-appending the prefix
+            if (strpos($id, $prefix) !== 0) {
+                $id = $prefix . $id;
+            }
+        } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
+            trigger_error(
+                '%Attr.IDPrefixLocal cannot be used unless ' .
+                '%Attr.IDPrefix is set',
+                E_USER_WARNING
+            );
+        }
+
+        if (!$this->selector) {
+            $id_accumulator =& $context->get('IDAccumulator');
+            if (isset($id_accumulator->ids[$id])) {
+                return false;
+            }
+        }
+
+        // we purposely avoid using regex, hopefully this is faster
+
+        if (ctype_alpha($id)) {
+            $result = true;
+        } else {
+            if (!ctype_alpha(@$id[0])) {
+                return false;
+            }
+            // primitive style of regexps, I suppose
+            $trim = trim(
+                $id,
+                'A..Za..z0..9:-._'
+            );
+            $result = ($trim === '');
+        }
+
+        $regexp = $config->get('Attr.IDBlacklistRegexp');
+        if ($regexp && preg_match($regexp, $id)) {
+            return false;
+        }
+
+        if (!$this->selector && $result) {
+            $id_accumulator->add($id);
+        }
+
+        // if no change was made to the ID, return the result
+        // else, return the new id if stripping whitespace made it
+        //     valid, or return false.
+        return $result ? $id : false;
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Length.php

@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Validates the HTML type length (not to be confused with CSS's length).
+ *
+ * This accepts integer pixels or percentages as lengths for certain
+ * HTML attributes.
+ */
+
+class HTMLPurifier_AttrDef_HTML_Length extends HTMLPurifier_AttrDef_HTML_Pixels
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '') {
+            return false;
+        }
+
+        $parent_result = parent::validate($string, $config, $context);
+        if ($parent_result !== false) {
+            return $parent_result;
+        }
+
+        $length = strlen($string);
+        $last_char = $string[$length - 1];
+
+        if ($last_char !== '%') {
+            return false;
+        }
+
+        $points = substr($string, 0, $length - 1);
+
+        if (!is_numeric($points)) {
+            return false;
+        }
+
+        $points = (int)$points;
+
+        if ($points < 0) {
+            return '0%';
+        }
+        if ($points > 100) {
+            return '100%';
+        }
+        return ((string)$points) . '%';
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/LinkTypes.php

@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * Validates a rel/rev link attribute against a directive of allowed values
+ * @note We cannot use Enum because link types allow multiple
+ *       values.
+ * @note Assumes link types are ASCII text
+ */
+class HTMLPurifier_AttrDef_HTML_LinkTypes extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * Name config attribute to pull.
+     * @type string
+     */
+    protected $name;
+
+    /**
+     * @param string $name
+     */
+    public function __construct($name)
+    {
+        $configLookup = array(
+            'rel' => 'AllowedRel',
+            'rev' => 'AllowedRev'
+        );
+        if (!isset($configLookup[$name])) {
+            trigger_error(
+                'Unrecognized attribute name for link ' .
+                'relationship.',
+                E_USER_ERROR
+            );
+            return;
+        }
+        $this->name = $configLookup[$name];
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $allowed = $config->get('Attr.' . $this->name);
+        if (empty($allowed)) {
+            return false;
+        }
+
+        $string = $this->parseCDATA($string);
+        $parts = explode(' ', $string);
+
+        // lookup to prevent duplicates
+        $ret_lookup = array();
+        foreach ($parts as $part) {
+            $part = strtolower(trim($part));
+            if (!isset($allowed[$part])) {
+                continue;
+            }
+            $ret_lookup[$part] = true;
+        }
+
+        if (empty($ret_lookup)) {
+            return false;
+        }
+        $string = implode(' ', array_keys($ret_lookup));
+        return $string;
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/MultiLength.php

@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * Validates a MultiLength as defined by the HTML spec.
+ *
+ * A multilength is either a integer (pixel count), a percentage, or
+ * a relative number.
+ */
+class HTMLPurifier_AttrDef_HTML_MultiLength extends HTMLPurifier_AttrDef_HTML_Length
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '') {
+            return false;
+        }
+
+        $parent_result = parent::validate($string, $config, $context);
+        if ($parent_result !== false) {
+            return $parent_result;
+        }
+
+        $length = strlen($string);
+        $last_char = $string[$length - 1];
+
+        if ($last_char !== '*') {
+            return false;
+        }
+
+        $int = substr($string, 0, $length - 1);
+
+        if ($int == '') {
+            return '*';
+        }
+        if (!is_numeric($int)) {
+            return false;
+        }
+
+        $int = (int)$int;
+        if ($int < 0) {
+            return false;
+        }
+        if ($int == 0) {
+            return '0';
+        }
+        if ($int == 1) {
+            return '*';
+        }
+        return ((string)$int) . '*';
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Nmtokens.php

@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * Validates contents based on NMTOKENS attribute type.
+ */
+class HTMLPurifier_AttrDef_HTML_Nmtokens extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+
+        // early abort: '' and '0' (strings that convert to false) are invalid
+        if (!$string) {
+            return false;
+        }
+
+        $tokens = $this->split($string, $config, $context);
+        $tokens = $this->filter($tokens, $config, $context);
+        if (empty($tokens)) {
+            return false;
+        }
+        return implode(' ', $tokens);
+    }
+
+    /**
+     * Splits a space separated list of tokens into its constituent parts.
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function split($string, $config, $context)
+    {
+        // OPTIMIZABLE!
+        // do the preg_match, capture all subpatterns for reformulation
+
+        // we don't support U+00A1 and up codepoints or
+        // escaping because I don't know how to do that with regexps
+        // and plus it would complicate optimization efforts (you never
+        // see that anyway).
+        $pattern = '/(?:(?<=\s)|\A)' . // look behind for space or string start
+            '((?:--|-?[A-Za-z_])[A-Za-z_\-0-9]*)' .
+            '(?:(?=\s)|\z)/'; // look ahead for space or string end
+        preg_match_all($pattern, $string, $matches);
+        return $matches[1];
+    }
+
+    /**
+     * Template method for removing certain tokens based on arbitrary criteria.
+     * @note If we wanted to be really functional, we'd do an array_filter
+     *       with a callback. But... we're not.
+     * @param array $tokens
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return array
+     */
+    protected function filter($tokens, $config, $context)
+    {
+        return $tokens;
+    }
+}
+
+// vim: et sw=4 sts=4

vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/HTML/Pixels.php

@@ -0,0 +1,76 @@
+<?php
+
+/**
+ * Validates an integer representation of pixels according to the HTML spec.
+ */
+class HTMLPurifier_AttrDef_HTML_Pixels extends HTMLPurifier_AttrDef
+{
+
+    /**
+     * @type int
+     */
+    protected $max;
+
+    /**
+     * @param int $max
+     */
+    public function __construct($max = null)
+    {
+        $this->max = $max;
+    }
+
+    /**
+     * @param string $string
+     * @param HTMLPurifier_Config $config
+     * @param HTMLPurifier_Context $context
+     * @return bool|string
+     */
+    public function validate($string, $config, $context)
+    {
+        $string = trim($string);
+        if ($string === '0') {
+            return $string;
+        }
+        if ($string === '') {
+            return false;
+        }
+        $length = strlen($string);
+        if (substr($string, $length - 2) == 'px') {
+            $string = substr($string, 0, $length - 2);
+        }
+        if (!is_numeric($string)) {
+            return false;
+        }
+        $int = (int)$string;
+
+        if ($int < 0) {
+            return '0';
+        }
+
+        // upper-bound value, extremely high values can
+        // crash operating systems, see <http://ha.ckers.org/imagecrash.html>
+        // WARNING, above link WILL crash you if you're using Windows
+
+        if ($this->max !== null && $int > $this->max) {
+            return (string)$this->max;
+        }
+        return (string)$int;
+    }
+
+    /**
+     * @param string $string
+     * @return HTMLPurifier_AttrDef
+     */
+    public function make($string)
+    {
+        if ($string === '') {
+            $max = null;
+        } else {
+            $max = (int)$string;
+        }
+        $class = get_class($this);
+        return new $class($max);
+    }
+}
+
+// vim: et sw=4 sts=4