From 6854cb3f4d8219cf1829e32122eb2502a916eae9 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 1 Feb 2020 09:05:48 +0100
Subject: initial checkin

---
 .../library/HTMLPurifier/AttrValidator.php         | 178 +++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php

(limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php')

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php
new file mode 100644
index 0000000..f97dc93
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrValidator.php
@@ -0,0 +1,178 @@
+<?php
+
+/**
+ * Validates the attributes of a token. Doesn't manage required attributes
+ * very well. The only reason we factored this out was because RemoveForeignElements
+ * also needed it besides ValidateAttributes.
+ */
+class HTMLPurifier_AttrValidator
+{
+
+    /**
+     * Validates the attributes of a token, mutating it as necessary.
+     * that has valid tokens
+     * @param HTMLPurifier_Token $token Token to validate.
+     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
+     * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
+     */
+    public function validateToken($token, $config, $context)
+    {
+        $definition = $config->getHTMLDefinition();
+        $e =& $context->get('ErrorCollector', true);
+
+        // initialize IDAccumulator if necessary
+        $ok =& $context->get('IDAccumulator', true);
+        if (!$ok) {
+            $id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context);
+            $context->register('IDAccumulator', $id_accumulator);
+        }
+
+        // initialize CurrentToken if necessary
+        $current_token =& $context->get('CurrentToken', true);
+        if (!$current_token) {
+            $context->register('CurrentToken', $token);
+        }
+
+        if (!$token instanceof HTMLPurifier_Token_Start &&
+            !$token instanceof HTMLPurifier_Token_Empty
+        ) {
+            return;
+        }
+
+        // create alias to global definition array, see also $defs
+        // DEFINITION CALL
+        $d_defs = $definition->info_global_attr;
+
+        // don't update token until the very end, to ensure an atomic update
+        $attr = $token->attr;
+
+        // do global transformations (pre)
+        // nothing currently utilizes this
+        foreach ($definition->info_attr_transform_pre as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // do local transformations only applicable to this element (pre)
+        // ex. <p align="right"> to <p style="text-align:right;">
+        foreach ($definition->info[$token->name]->attr_transform_pre as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // create alias to this element's attribute definition array, see
+        // also $d_defs (global attribute definition array)
+        // DEFINITION CALL
+        $defs = $definition->info[$token->name]->attr;
+
+        $attr_key = false;
+        $context->register('CurrentAttr', $attr_key);
+
+        // iterate through all the attribute keypairs
+        // Watch out for name collisions: $key has previously been used
+        foreach ($attr as $attr_key => $value) {
+
+            // call the definition
+            if (isset($defs[$attr_key])) {
+                // there is a local definition defined
+                if ($defs[$attr_key] === false) {
+                    // We've explicitly been told not to allow this element.
+                    // This is usually when there's a global definition
+                    // that must be overridden.
+                    // Theoretically speaking, we could have a
+                    // AttrDef_DenyAll, but this is faster!
+                    $result = false;
+                } else {
+                    // validate according to the element's definition
+                    $result = $defs[$attr_key]->validate(
+                        $value,
+                        $config,
+                        $context
+                    );
+                }
+            } elseif (isset($d_defs[$attr_key])) {
+                // there is a global definition defined, validate according
+                // to the global definition
+                $result = $d_defs[$attr_key]->validate(
+                    $value,
+                    $config,
+                    $context
+                );
+            } else {
+                // system never heard of the attribute? DELETE!
+                $result = false;
+            }
+
+            // put the results into effect
+            if ($result === false || $result === null) {
+                // this is a generic error message that should replaced
+                // with more specific ones when possible
+                if ($e) {
+                    $e->send(E_ERROR, 'AttrValidator: Attribute removed');
+                }
+
+                // remove the attribute
+                unset($attr[$attr_key]);
+            } elseif (is_string($result)) {
+                // generally, if a substitution is happening, there
+                // was some sort of implicit correction going on. We'll
+                // delegate it to the attribute classes to say exactly what.
+
+                // simple substitution
+                $attr[$attr_key] = $result;
+            } else {
+                // nothing happens
+            }
+
+            // we'd also want slightly more complicated substitution
+            // involving an array as the return value,
+            // although we're not sure how colliding attributes would
+            // resolve (certain ones would be completely overriden,
+            // others would prepend themselves).
+        }
+
+        $context->destroy('CurrentAttr');
+
+        // post transforms
+
+        // global (error reporting untested)
+        foreach ($definition->info_attr_transform_post as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        // local (error reporting untested)
+        foreach ($definition->info[$token->name]->attr_transform_post as $transform) {
+            $attr = $transform->transform($o = $attr, $config, $context);
+            if ($e) {
+                if ($attr != $o) {
+                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
+                }
+            }
+        }
+
+        $token->attr = $attr;
+
+        // destroy CurrentToken if we made it ourselves
+        if (!$current_token) {
+            $context->destroy('CurrentToken');
+        }
+
+    }
+
+
+}
+
+// vim: et sw=4 sts=4
-- 
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