This file is indexed.

/usr/share/php/HTMLPurifier/HTMLModuleManager.php is in php-htmlpurifier 4.7.0-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
<?php

class HTMLPurifier_HTMLModuleManager
{

    /**
     * @type HTMLPurifier_DoctypeRegistry
     */
    public $doctypes;

    /**
     * Instance of current doctype.
     * @type string
     */
    public $doctype;

    /**
     * @type HTMLPurifier_AttrTypes
     */
    public $attrTypes;

    /**
     * Active instances of modules for the specified doctype are
     * indexed, by name, in this array.
     * @type HTMLPurifier_HTMLModule[]
     */
    public $modules = array();

    /**
     * Array of recognized HTMLPurifier_HTMLModule instances,
     * indexed by module's class name. This array is usually lazy loaded, but a
     * user can overload a module by pre-emptively registering it.
     * @type HTMLPurifier_HTMLModule[]
     */
    public $registeredModules = array();

    /**
     * List of extra modules that were added by the user
     * using addModule(). These get unconditionally merged into the current doctype, whatever
     * it may be.
     * @type HTMLPurifier_HTMLModule[]
     */
    public $userModules = array();

    /**
     * Associative array of element name to list of modules that have
     * definitions for the element; this array is dynamically filled.
     * @type array
     */
    public $elementLookup = array();

    /**
     * List of prefixes we should use for registering small names.
     * @type array
     */
    public $prefixes = array('HTMLPurifier_HTMLModule_');

    /**
     * @type HTMLPurifier_ContentSets
     */
    public $contentSets;

    /**
     * @type HTMLPurifier_AttrCollections
     */
    public $attrCollections;

    /**
     * If set to true, unsafe elements and attributes will be allowed.
     * @type bool
     */
    public $trusted = false;

    public function __construct()
    {
        // editable internal objects
        $this->attrTypes = new HTMLPurifier_AttrTypes();
        $this->doctypes  = new HTMLPurifier_DoctypeRegistry();

        // setup basic modules
        $common = array(
            'CommonAttributes', 'Text', 'Hypertext', 'List',
            'Presentation', 'Edit', 'Bdo', 'Tables', 'Image',
            'StyleAttribute',
            // Unsafe:
            'Scripting', 'Object', 'Forms',
            // Sorta legacy, but present in strict:
            'Name',
        );
        $transitional = array('Legacy', 'Target', 'Iframe');
        $xml = array('XMLCommonAttributes');
        $non_xml = array('NonXMLCommonAttributes');

        // setup basic doctypes
        $this->doctypes->register(
            'HTML 4.01 Transitional',
            false,
            array_merge($common, $transitional, $non_xml),
            array('Tidy_Transitional', 'Tidy_Proprietary'),
            array(),
            '-//W3C//DTD HTML 4.01 Transitional//EN',
            'http://www.w3.org/TR/html4/loose.dtd'
        );

        $this->doctypes->register(
            'HTML 4.01 Strict',
            false,
            array_merge($common, $non_xml),
            array('Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
            array(),
            '-//W3C//DTD HTML 4.01//EN',
            'http://www.w3.org/TR/html4/strict.dtd'
        );

        $this->doctypes->register(
            'XHTML 1.0 Transitional',
            true,
            array_merge($common, $transitional, $xml, $non_xml),
            array('Tidy_Transitional', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Name'),
            array(),
            '-//W3C//DTD XHTML 1.0 Transitional//EN',
            'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'
        );

        $this->doctypes->register(
            'XHTML 1.0 Strict',
            true,
            array_merge($common, $xml, $non_xml),
            array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Strict', 'Tidy_Proprietary', 'Tidy_Name'),
            array(),
            '-//W3C//DTD XHTML 1.0 Strict//EN',
            'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'
        );

        $this->doctypes->register(
            'XHTML 1.1',
            true,
            // Iframe is a real XHTML 1.1 module, despite being
            // "transitional"!
            array_merge($common, $xml, array('Ruby', 'Iframe')),
            array('Tidy_Strict', 'Tidy_XHTML', 'Tidy_Proprietary', 'Tidy_Strict', 'Tidy_Name'), // Tidy_XHTML1_1
            array(),
            '-//W3C//DTD XHTML 1.1//EN',
            'http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd'
        );

    }

    /**
     * Registers a module to the recognized module list, useful for
     * overloading pre-existing modules.
     * @param $module Mixed: string module name, with or without
     *                HTMLPurifier_HTMLModule prefix, or instance of
     *                subclass of HTMLPurifier_HTMLModule.
     * @param $overload Boolean whether or not to overload previous modules.
     *                  If this is not set, and you do overload a module,
     *                  HTML Purifier will complain with a warning.
     * @note This function will not call autoload, you must instantiate
     *       (and thus invoke) autoload outside the method.
     * @note If a string is passed as a module name, different variants
     *       will be tested in this order:
     *          - Check for HTMLPurifier_HTMLModule_$name
     *          - Check all prefixes with $name in order they were added
     *          - Check for literal object name
     *          - Throw fatal error
     *       If your object name collides with an internal class, specify
     *       your module manually. All modules must have been included
     *       externally: registerModule will not perform inclusions for you!
     */
    public function registerModule($module, $overload = false)
    {
        if (is_string($module)) {
            // attempt to load the module
            $original_module = $module;
            $ok = false;
            foreach ($this->prefixes as $prefix) {
                $module = $prefix . $original_module;
                if (class_exists($module)) {
                    $ok = true;
                    break;
                }
            }
            if (!$ok) {
                $module = $original_module;
                if (!class_exists($module)) {
                    trigger_error(
                        $original_module . ' module does not exist',
                        E_USER_ERROR
                    );
                    return;
                }
            }
            $module = new $module();
        }
        if (empty($module->name)) {
            trigger_error('Module instance of ' . get_class($module) . ' must have name');
            return;
        }
        if (!$overload && isset($this->registeredModules[$module->name])) {
            trigger_error('Overloading ' . $module->name . ' without explicit overload parameter', E_USER_WARNING);
        }
        $this->registeredModules[$module->name] = $module;
    }

    /**
     * Adds a module to the current doctype by first registering it,
     * and then tacking it on to the active doctype
     */
    public function addModule($module)
    {
        $this->registerModule($module);
        if (is_object($module)) {
            $module = $module->name;
        }
        $this->userModules[] = $module;
    }

    /**
     * Adds a class prefix that registerModule() will use to resolve a
     * string name to a concrete class
     */
    public function addPrefix($prefix)
    {
        $this->prefixes[] = $prefix;
    }

    /**
     * Performs processing on modules, after being called you may
     * use getElement() and getElements()
     * @param HTMLPurifier_Config $config
     */
    public function setup($config)
    {
        $this->trusted = $config->get('HTML.Trusted');

        // generate
        $this->doctype = $this->doctypes->make($config);
        $modules = $this->doctype->modules;

        // take out the default modules that aren't allowed
        $lookup = $config->get('HTML.AllowedModules');
        $special_cases = $config->get('HTML.CoreModules');

        if (is_array($lookup)) {
            foreach ($modules as $k => $m) {
                if (isset($special_cases[$m])) {
                    continue;
                }
                if (!isset($lookup[$m])) {
                    unset($modules[$k]);
                }
            }
        }

        // custom modules
        if ($config->get('HTML.Proprietary')) {
            $modules[] = 'Proprietary';
        }
        if ($config->get('HTML.SafeObject')) {
            $modules[] = 'SafeObject';
        }
        if ($config->get('HTML.SafeEmbed')) {
            $modules[] = 'SafeEmbed';
        }
        if ($config->get('HTML.SafeScripting') !== array()) {
            $modules[] = 'SafeScripting';
        }
        if ($config->get('HTML.Nofollow')) {
            $modules[] = 'Nofollow';
        }
        if ($config->get('HTML.TargetBlank')) {
            $modules[] = 'TargetBlank';
        }

        // merge in custom modules
        $modules = array_merge($modules, $this->userModules);

        foreach ($modules as $module) {
            $this->processModule($module);
            $this->modules[$module]->setup($config);
        }

        foreach ($this->doctype->tidyModules as $module) {
            $this->processModule($module);
            $this->modules[$module]->setup($config);
        }

        // prepare any injectors
        foreach ($this->modules as $module) {
            $n = array();
            foreach ($module->info_injector as $injector) {
                if (!is_object($injector)) {
                    $class = "HTMLPurifier_Injector_$injector";
                    $injector = new $class;
                }
                $n[$injector->name] = $injector;
            }
            $module->info_injector = $n;
        }

        // setup lookup table based on all valid modules
        foreach ($this->modules as $module) {
            foreach ($module->info as $name => $def) {
                if (!isset($this->elementLookup[$name])) {
                    $this->elementLookup[$name] = array();
                }
                $this->elementLookup[$name][] = $module->name;
            }
        }

        // note the different choice
        $this->contentSets = new HTMLPurifier_ContentSets(
            // content set assembly deals with all possible modules,
            // not just ones deemed to be "safe"
            $this->modules
        );
        $this->attrCollections = new HTMLPurifier_AttrCollections(
            $this->attrTypes,
            // there is no way to directly disable a global attribute,
            // but using AllowedAttributes or simply not including
            // the module in your custom doctype should be sufficient
            $this->modules
        );
    }

    /**
     * Takes a module and adds it to the active module collection,
     * registering it if necessary.
     */
    public function processModule($module)
    {
        if (!isset($this->registeredModules[$module]) || is_object($module)) {
            $this->registerModule($module);
        }
        $this->modules[$module] = $this->registeredModules[$module];
    }

    /**
     * Retrieves merged element definitions.
     * @return Array of HTMLPurifier_ElementDef
     */
    public function getElements()
    {
        $elements = array();
        foreach ($this->modules as $module) {
            if (!$this->trusted && !$module->safe) {
                continue;
            }
            foreach ($module->info as $name => $v) {
                if (isset($elements[$name])) {
                    continue;
                }
                $elements[$name] = $this->getElement($name);
            }
        }

        // remove dud elements, this happens when an element that
        // appeared to be safe actually wasn't
        foreach ($elements as $n => $v) {
            if ($v === false) {
                unset($elements[$n]);
            }
        }

        return $elements;

    }

    /**
     * Retrieves a single merged element definition
     * @param string $name Name of element
     * @param bool $trusted Boolean trusted overriding parameter: set to true
     *                 if you want the full version of an element
     * @return HTMLPurifier_ElementDef Merged HTMLPurifier_ElementDef
     * @note You may notice that modules are getting iterated over twice (once
     *       in getElements() and once here). This
     *       is because
     */
    public function getElement($name, $trusted = null)
    {
        if (!isset($this->elementLookup[$name])) {
            return false;
        }

        // setup global state variables
        $def = false;
        if ($trusted === null) {
            $trusted = $this->trusted;
        }

        // iterate through each module that has registered itself to this
        // element
        foreach ($this->elementLookup[$name] as $module_name) {
            $module = $this->modules[$module_name];

            // refuse to create/merge from a module that is deemed unsafe--
            // pretend the module doesn't exist--when trusted mode is not on.
            if (!$trusted && !$module->safe) {
                continue;
            }

            // clone is used because, ideally speaking, the original
            // definition should not be modified. Usually, this will
            // make no difference, but for consistency's sake
            $new_def = clone $module->info[$name];

            if (!$def && $new_def->standalone) {
                $def = $new_def;
            } elseif ($def) {
                // This will occur even if $new_def is standalone. In practice,
                // this will usually result in a full replacement.
                $def->mergeIn($new_def);
            } else {
                // :TODO:
                // non-standalone definitions that don't have a standalone
                // to merge into could be deferred to the end
                // HOWEVER, it is perfectly valid for a non-standalone
                // definition to lack a standalone definition, even
                // after all processing: this allows us to safely
                // specify extra attributes for elements that may not be
                // enabled all in one place.  In particular, this might
                // be the case for trusted elements.  WARNING: care must
                // be taken that the /extra/ definitions are all safe.
                continue;
            }

            // attribute value expansions
            $this->attrCollections->performInclusions($def->attr);
            $this->attrCollections->expandIdentifiers($def->attr, $this->attrTypes);

            // descendants_are_inline, for ChildDef_Chameleon
            if (is_string($def->content_model) &&
                strpos($def->content_model, 'Inline') !== false) {
                if ($name != 'del' && $name != 'ins') {
                    // this is for you, ins/del
                    $def->descendants_are_inline = true;
                }
            }

            $this->contentSets->generateChildDef($def, $module);
        }

        // This can occur if there is a blank definition, but no base to
        // mix it in with
        if (!$def) {
            return false;
        }

        // add information on required attributes
        foreach ($def->attr as $attr_name => $attr_def) {
            if ($attr_def->required) {
                $def->required_attr[] = $attr_name;
            }
        }
        return $def;
    }
}

// vim: et sw=4 sts=4