author | ymh <ymh.work@gmail.com> |
Tue, 20 Mar 2018 15:02:40 +0100 | |
changeset 573 | 25f3d28f51b2 |
parent 541 | e756a8c72c3d |
permissions | -rwxr-xr-x |
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Install |
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How to install HTML Purifier |
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HTML Purifier is designed to run out of the box, so actually using the |
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library is extremely easy. (Although... if you were looking for a |
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step-by-step installation GUI, you've downloaded the wrong software!) |
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While the impatient can get going immediately with some of the sample |
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code at the bottom of this library, it's well worth reading this entire |
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document--most of the other documentation assumes that you are familiar |
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with these contents. |
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1. Compatibility |
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HTML Purifier is PHP 5 only, and is actively tested from PHP 5.0.5 and |
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up. It has no core dependencies with other libraries. PHP |
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4 support was deprecated on December 31, 2007 with HTML Purifier 3.0.0. |
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HTML Purifier is not compatible with zend.ze1_compatibility_mode. |
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These optional extensions can enhance the capabilities of HTML Purifier: |
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* iconv : Converts text to and from non-UTF-8 encodings |
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* bcmath : Used for unit conversion and imagecrash protection |
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* tidy : Used for pretty-printing HTML |
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These optional libraries can enhance the capabilities of HTML Purifier: |
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* CSSTidy : Clean CSS stylesheets using %Core.ExtractStyleBlocks |
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* Net_IDNA2 (PEAR) : IRI support using %Core.EnableIDNA |
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2. Reconnaissance |
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A big plus of HTML Purifier is its inerrant support of standards, so |
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your web-pages should be standards-compliant. (They should also use |
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semantic markup, but that's another issue altogether, one HTML Purifier |
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cannot fix without reading your mind.) |
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HTML Purifier can process these doctypes: |
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* XHTML 1.0 Transitional (default) |
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* XHTML 1.0 Strict |
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* HTML 4.01 Transitional |
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* HTML 4.01 Strict |
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* XHTML 1.1 |
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...and these character encodings: |
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* UTF-8 (default) |
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* Any encoding iconv supports (with crippled internationalization support) |
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These defaults reflect what my choices would be if I were authoring an |
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HTML document, however, what you choose depends on the nature of your |
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codebase. If you don't know what doctype you are using, you can determine |
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the doctype from this identifier at the top of your source code: |
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" |
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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...and the character encoding from this code: |
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<meta http-equiv="Content-type" content="text/html;charset=ENCODING"> |
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If the character encoding declaration is missing, STOP NOW, and |
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read 'docs/enduser-utf8.html' (web accessible at |
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http://htmlpurifier.org/docs/enduser-utf8.html). In fact, even if it is |
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present, read this document anyway, as many websites specify their |
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document's character encoding incorrectly. |
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3. Including the library |
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The procedure is quite simple: |
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require_once '/path/to/library/HTMLPurifier.auto.php'; |
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This will setup an autoloader, so the library's files are only included |
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when you use them. |
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Only the contents in the library/ folder are necessary, so you can remove |
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everything else when using HTML Purifier in a production environment. |
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If you installed HTML Purifier via PEAR, all you need to do is: |
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require_once 'HTMLPurifier.auto.php'; |
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Please note that the usual PEAR practice of including just the classes you |
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want will not work with HTML Purifier's autoloading scheme. |
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Advanced users, read on; other users can skip to section 4. |
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Autoload compatibility |
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---------------------- |
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HTML Purifier attempts to be as smart as possible when registering an |
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autoloader, but there are some cases where you will need to change |
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your own code to accomodate HTML Purifier. These are those cases: |
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PHP VERSION IS LESS THAN 5.1.2, AND YOU'VE DEFINED __autoload |
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Because spl_autoload_register() doesn't exist in early versions |
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of PHP 5, HTML Purifier has no way of adding itself to the autoload |
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stack. Modify your __autoload function to test |
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HTMLPurifier_Bootstrap::autoload($class) |
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For example, suppose your autoload function looks like this: |
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function __autoload($class) { |
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require str_replace('_', '/', $class) . '.php'; |
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return true; |
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} |
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A modified version with HTML Purifier would look like this: |
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function __autoload($class) { |
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if (HTMLPurifier_Bootstrap::autoload($class)) return true; |
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require str_replace('_', '/', $class) . '.php'; |
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return true; |
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} |
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123 |
|
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Note that there *is* some custom behavior in our autoloader; the |
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original autoloader in our example would work for 99% of the time, |
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but would fail when including language files. |
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127 |
|
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AN __autoload FUNCTION IS DECLARED AFTER OUR AUTOLOADER IS REGISTERED |
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spl_autoload_register() has the curious behavior of disabling |
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the existing __autoload() handler. Users need to explicitly |
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spl_autoload_register('__autoload'). Because we use SPL when it |
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is available, __autoload() will ALWAYS be disabled. If __autoload() |
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is declared before HTML Purifier is loaded, this is not a problem: |
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HTML Purifier will register the function for you. But if it is |
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declared afterwards, it will mysteriously not work. This |
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snippet of code (after your autoloader is defined) will fix it: |
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137 |
|
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spl_autoload_register('__autoload') |
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139 |
|
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Users should also be on guard if they use a version of PHP previous |
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to 5.1.2 without an autoloader--HTML Purifier will define __autoload() |
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for you, which can collide with an autoloader that was added by *you* |
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later. |
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144 |
|
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145 |
|
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For better performance |
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---------------------- |
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|
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Opcode caches, which greatly speed up PHP initialization for scripts |
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with large amounts of code (HTML Purifier included), don't like |
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autoloaders. We offer an include file that includes all of HTML Purifier's |
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files in one go in an opcode cache friendly manner: |
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153 |
|
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// If /path/to/library isn't already in your include path, uncomment |
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// the below line: |
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// require '/path/to/library/HTMLPurifier.path.php'; |
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|
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require 'HTMLPurifier.includes.php'; |
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|
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Optional components still need to be included--you'll know if you try to |
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use a feature and you get a class doesn't exists error! The autoloader |
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can be used in conjunction with this approach to catch classes that are |
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missing. Simply add this afterwards: |
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|
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require 'HTMLPurifier.autoload.php'; |
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|
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Standalone version |
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------------------ |
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169 |
|
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HTML Purifier has a standalone distribution; you can also generate |
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a standalone file from the full version by running the script |
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maintenance/generate-standalone.php . The standalone version has the |
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benefit of having most of its code in one file, so parsing is much |
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faster and the library is easier to manage. |
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|
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If HTMLPurifier.standalone.php exists in the library directory, you |
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can use it like this: |
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|
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require '/path/to/HTMLPurifier.standalone.php'; |
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|
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This is equivalent to including HTMLPurifier.includes.php, except that |
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the contents of standalone/ will be added to your path. To override this |
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behavior, specify a new HTMLPURIFIER_PREFIX where standalone files can |
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be found (usually, this will be one directory up, the "true" library |
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directory in full distributions). Don't forget to set your path too! |
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|
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The autoloader can be added to the end to ensure the classes are |
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loaded when necessary; otherwise you can manually include them. |
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To use the autoloader, use this: |
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|
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191 |
require 'HTMLPurifier.autoload.php'; |
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192 |
|
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For advanced users |
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------------------ |
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|
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HTMLPurifier.auto.php performs a number of operations that can be done |
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individually. These are: |
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|
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HTMLPurifier.path.php |
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Puts /path/to/library in the include path. For high performance, |
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this should be done in php.ini. |
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|
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203 |
HTMLPurifier.autoload.php |
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Registers our autoload handler HTMLPurifier_Bootstrap::autoload($class). |
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|
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You can do these operations by yourself--in fact, you must modify your own |
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autoload handler if you are using a version of PHP earlier than PHP 5.1.2 |
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(See "Autoload compatibility" above). |
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209 |
|
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|
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--------------------------------------------------------------------------- |
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4. Configuration |
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|
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HTML Purifier is designed to run out-of-the-box, but occasionally HTML |
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Purifier needs to be told what to do. If you answer no to any of these |
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questions, read on; otherwise, you can skip to the next section (or, if you're |
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into configuring things just for the heck of it, skip to 4.3). |
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|
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* Am I using UTF-8? |
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* Am I using XHTML 1.0 Transitional? |
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221 |
|
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If you answered no to any of these questions, instantiate a configuration |
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object and read on: |
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|
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$config = HTMLPurifier_Config::createDefault(); |
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|
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4.1. Setting a different character encoding |
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|
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You really shouldn't use any other encoding except UTF-8, especially if you |
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plan to support multilingual websites (read section three for more details). |
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However, switching to UTF-8 is not always immediately feasible, so we can |
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adapt. |
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234 |
|
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HTML Purifier uses iconv to support other character encodings, as such, |
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any encoding that iconv supports <http://www.gnu.org/software/libiconv/> |
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HTML Purifier supports with this code: |
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238 |
|
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$config->set('Core.Encoding', /* put your encoding here */); |
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|
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An example usage for Latin-1 websites (the most common encoding for English |
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websites): |
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|
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$config->set('Core.Encoding', 'ISO-8859-1'); |
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|
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Note that HTML Purifier's support for non-Unicode encodings is crippled by the |
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fact that any character not supported by that encoding will be silently |
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dropped, EVEN if it is ampersand escaped. If you want to work around |
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this, you are welcome to read docs/enduser-utf8.html for a fix, |
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but please be cognizant of the issues the "solution" creates (for this |
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reason, I do not include the solution in this document). |
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|
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4.2. Setting a different doctype |
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For those of you using HTML 4.01 Transitional, you can disable |
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XHTML output like this: |
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|
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$config->set('HTML.Doctype', 'HTML 4.01 Transitional'); |
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Other supported doctypes include: |
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|
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* HTML 4.01 Strict |
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* HTML 4.01 Transitional |
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* XHTML 1.0 Strict |
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* XHTML 1.0 Transitional |
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* XHTML 1.1 |
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|
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4.3. Other settings |
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There are more configuration directives which can be read about |
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here: <http://htmlpurifier.org/live/configdoc/plain.html> They're a bit boring, |
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but they can help out for those of you who like to exert maximum control over |
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your code. Some of the more interesting ones are configurable at the |
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demo <http://htmlpurifier.org/demo.php> and are well worth looking into |
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for your own system. |
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|
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For example, you can fine tune allowed elements and attributes, convert |
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relative URLs to absolute ones, and even autoparagraph input text! These |
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are, respectively, %HTML.Allowed, %URI.MakeAbsolute and %URI.Base, and |
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%AutoFormat.AutoParagraph. The %Namespace.Directive naming convention |
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translates to: |
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|
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$config->set('Namespace.Directive', $value); |
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|
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E.g. |
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|
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$config->set('HTML.Allowed', 'p,b,a[href],i'); |
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$config->set('URI.Base', 'http://www.example.com'); |
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$config->set('URI.MakeAbsolute', true); |
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$config->set('AutoFormat.AutoParagraph', true); |
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|
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--------------------------------------------------------------------------- |
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5. Caching |
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|
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HTML Purifier generates some cache files (generally one or two) to speed up |
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its execution. For maximum performance, make sure that |
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library/HTMLPurifier/DefinitionCache/Serializer is writeable by the webserver. |
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If you are in the library/ folder of HTML Purifier, you can set the |
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appropriate permissions using: |
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chmod -R 0755 HTMLPurifier/DefinitionCache/Serializer |
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If the above command doesn't work, you may need to assign write permissions |
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to all. This may be necessary if your webserver runs as nobody, but is |
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not recommended since it means any other user can write files in the |
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directory. Use: |
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|
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chmod -R 0777 HTMLPurifier/DefinitionCache/Serializer |
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|
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You can also chmod files via your FTP client; this option |
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is usually accessible by right clicking the corresponding directory and |
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then selecting "chmod" or "file permissions". |
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|
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Starting with 2.0.1, HTML Purifier will generate friendly error messages |
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that will tell you exactly what you have to chmod the directory to, if in doubt, |
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follow its advice. |
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|
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If you are unable or unwilling to give write permissions to the cache |
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directory, you can either disable the cache (and suffer a performance |
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hit): |
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|
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$config->set('Core.DefinitionCache', null); |
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|
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Or move the cache directory somewhere else (no trailing slash): |
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|
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$config->set('Cache.SerializerPath', '/home/user/absolute/path'); |
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|
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--------------------------------------------------------------------------- |
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6. Using the code |
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|
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The interface is mind-numbingly simple: |
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|
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$purifier = new HTMLPurifier($config); |
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$clean_html = $purifier->purify( $dirty_html ); |
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|
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That's it! For more examples, check out docs/examples/ (they aren't very |
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different though). Also, docs/enduser-slow.html gives advice on what to |
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do if HTML Purifier is slowing down your application. |
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|
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|
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--------------------------------------------------------------------------- |
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7. Quick install |
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|
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First, make sure library/HTMLPurifier/DefinitionCache/Serializer is |
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writable by the webserver (see Section 5: Caching above for details). |
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If your website is in UTF-8 and XHTML Transitional, use this code: |
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|
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<?php |
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require_once '/path/to/htmlpurifier/library/HTMLPurifier.auto.php'; |
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|
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$config = HTMLPurifier_Config::createDefault(); |
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$purifier = new HTMLPurifier($config); |
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$clean_html = $purifier->purify($dirty_html); |
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?> |
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|
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If your website is in a different encoding or doctype, use this code: |
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362 |
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e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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363 |
<?php |
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integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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364 |
require_once '/path/to/htmlpurifier/library/HTMLPurifier.auto.php'; |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
diff
changeset
|
365 |
|
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
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366 |
$config = HTMLPurifier_Config::createDefault(); |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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367 |
$config->set('Core.Encoding', 'ISO-8859-1'); // replace with your encoding |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
diff
changeset
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368 |
$config->set('HTML.Doctype', 'HTML 4.01 Transitional'); // replace with your doctype |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
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369 |
$purifier = new HTMLPurifier($config); |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
|
370 |
|
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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371 |
$clean_html = $purifier->purify($dirty_html); |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
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372 |
?> |
e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
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373 |
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e756a8c72c3d
integrate drupal and correct build process. update version
ymh <ymh.work@gmail.com>
parents:
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changeset
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374 |
vim: et sw=4 sts=4 |