[Data Liberation] wp_rewrite_urls() #1893

adamziel · 2024-10-14T17:55:23Z

Motivation for the change, related issues

A part of #1894.

Prototypes a wp_rewrite_urls() URL rewriter for block markup to migrate the content from, say, <a href="https://adamadam.blog"> to <a href="https://adamziel.com/blog">.

Status:

URL rewriting works to perhaps the greatest extent it ever did in WordPress migrations.
The URL parser requires PHP 8.1. This is fine for some Playground applications, but we'll need PHP 7.2+ compatibility to get it into WordPress core.
This PR features WP_HTML_Tag_Processor and WP_HTML_Processor to enable usage outside of WordPress core.

Details

This PR consists of a code ported from https://github.com/adamziel/site-transfer-protocol. It uses a cascade of parsers to pierce through the structured data in a WordPress post and replace the URLs matching the requested domain.

The data flow is as follows:

Parse HTML -> Parse block comments -> Parse attributes JSON -> Parse URLs

On a high level, this parsing cascade is handled by the WP_Block_Markup_Url_Processor class:

$p = new WP_Block_Markup_Url_Processor( $block_markup, $base_url );
while ( $p->next_url() ) {
	$parsed_matched_url = $p->get_parsed_url();
	// .. do processing
	$p->set_raw_url($new_raw_url);
}

Getting more into details, the WP_Block_Markup_Url_Processor extends the WP_HTML_Tag_Processor class and walks the block markup token by token. It then drills down into:

Text nodes – where matches URLs using regexps. This part can be improved to avoid regular expressions.
Block comments – where it parses the block attributes and iterates through them, looking for ones that contain valid URLs
HTML tag attributes – where it looks for ones that are reserved for URLs (such as <a href="">, looking for ones that contain valid URLs

The next_url() method moves through the stream of tokens, looking for the next match in one of the above contexts, and the set_raw_url() knows how to update each node type, e.g. block attributes updates are json_encode()-d.

Processing tricky inputs

When this code is fed into the migrator:

<!-- wp:paragraph -->
<p>
	<!-- Inline URLs are migrated -->
	🚀-science.com/science has the best scientific articles on the internet! We're also
	available via the punycode URL:
	
	<!-- No problem handling HTML-encoded punycode URLs with urlencoded characters in the path -->
	&#104;ttps://xn---&#115;&#99;ience-7f85g.com/%73%63ience/.
	
	<!-- Correctly ignores similar–but–different URLs -->
	This isn't migrated: https://🚀-science.comcast/science <br>
	Or this: super-🚀-science.com/science
</p>
<!-- /wp:paragraph -->

<!-- Block attributes are migrated without any issue -->
<!-- wp:image {"src": "https:\/\/\ud83d\ude80-\u0073\u0063ience.com/%73%63ience/wp-content/image.png"} -->
<!-- As are URI HTML attributes -->
<img src="&#104;ttps://xn---&#115;&#99;ience-7f85g.com/science/wp-content/image.png">
<!-- /wp:image -->

<!-- Classes are not migrated. -->
<span class="https://🚀-science.com/science"></span>

This actual output is produced:

<!-- wp:paragraph -->
<p>
	<!-- Inline URLs are migrated -->
	science.wordpress.com has the best scientific articles on the internet! We're also
	available via the punycode URL:
	
	<!-- No problem handling HTML-encoded punycode URLs with urlencoded characters in the path -->
	https://science.wordpress.com/.
	
	<!-- Correctly ignores similar–but–different URLs -->
	This isn't migrated: https://🚀-science.comcast/science <br>
	Or this: super-🚀-science.com/science
</p>
<!-- /wp:paragraph -->

<!-- Block attributes are migrated without any issue -->
<!-- wp:image {"src":"https:\/\/science.wordpress.com\/wp-content\/image.png"} -->
<!-- As are URI HTML attributes -->
<img src="https://science.wordpress.com/wp-content/image.png">
<!-- /wp:image -->

<!-- Classes are not migrated. -->
<span class="https://🚀-science.com/science"></span>

Remaining work

Add PHPCBF
Get to zero CBF errors
Get the unit tests to run in CI (e.g. run composer install)
Add relevant unit tests coverage
Review the API shape

Follow-up work

Patch WP_HTML_Tag_Processor in WordPress core, see HTML API: Add set_modifiable_text() for replacing text nodes. wordpress-develop#7007 (comment)
Package our copy of WP_HTML_Tag_Processor as a "WordPress polyfill" for standalone usage.
Make it compatible with PHP 7.2+

Testing Instructions (or ideally a Blueprint)

CI runs the PHP unit tests. To run this on your local machine, do this:

cd packages/playground/data-liberation
composer install
cd ../../../
nx test:watch playground-data-liberation

adamziel · 2024-10-28T23:13:26Z

I thought it won't be ready for some more time but I today landed a comfortable enough amount of unit tests to merge this PR as v1 of wp_rewrite_urls(). The API shape will likely change. This is all new code, not yet used anywhere in Playground. Let's keep building on top of it.

A part of #1894. Follows up on #1893. This PR brings in a few more PHP APIs that were initially explored outside of Playground so that they can be incubated in Playground. See the linked descriptions for more details about each API: * XML Processor from WordPress/wordpress-develop#6713 * Stream chain from adamziel/wxr-normalize#1 * A draft of a WXR URL Rewriter class capable of rewriting URLs in WXR files ## Testing instructions * Confirm the PHPUnit tests pass in CI * Confirm the test suite looks reasonabel * That's it for now! It's all new code that's not actually used anywhere in Playground yet. I just want to merge it to keep iterating and improving.

brandonpayton

Hi, I am catching up on reviewing merged PRs and am leaving comments in case they are valuable.

packages/playground/data-liberation/bin/regenerate_public_suffix_list.php

brandonpayton · 2024-12-02T19:42:57Z

packages/playground/data-liberation/src/WP_Block_Markup_Processor.php

+		while ( true ) {
+			$this->block_attributes_iterator->next();
+			if ( ! $this->block_attributes_iterator->valid() ) {
+				break;
+			}
+			return true;
+		}
+
+		return false;


What is the purpose of this while-true loop? It looks like we might be able to simplify this to:

$this->block_attributes_iterator->next(); if ( $this->block_attributes_iterator->valid() ) { return true; } return false;

brandonpayton · 2024-12-02T19:57:11Z

packages/playground/data-liberation/src/WP_Block_Markup_Url_Processor.php

+			 * base URL.
+			 * When a base URL is missing, the string must start with a protocol to
+			 * be considered a URL.
+			 */


I like this comment.

Thinking about it led to thinking about subdirectory-based multisites and this question:

Should we have any concern for cases where a subdir multisite is moved to a different base subdir. For example, if http://earth.com/old-multisite/<blog> is moved to http://moon.com/new-multisite/<blog>, would we want to handle rewriting /old-multisite to /new-multisite?

Such URLs may or may not include the hostname.

Maybe if we support path rewriting, it will need to be an optional rewrite feature, and maybe even a separate facility because, as this comment implies, it's conceivable that there may be false-positives.

Good spot! The good news is path rewriting is supported :) not sure if in this PR, but for sure in trunk. It won't catch everything, e.g. host-less paths in text content, but it will catch a lot.

brandonpayton · 2024-12-02T20:02:42Z

packages/playground/data-liberation/src/WP_URL_In_Text_Processor.php

+		$this->did_prepend_protocol = false;
+		while ( true ) {
+			/**
+			 * Thick sieve – eagerly match things that look like URLs but turn out to not be URLs in the end.


adamziel added 5 commits October 14, 2024 18:43

Data liberation: Kickoff the project

1ef710f

Port the URL rewriters from adamziel/site-transfer-protocol

234a8bf

Port WP_HTML_Processor et al. from WordPress

819febd

Move WordPress core files

0a6167b

Outline the next steps

826fe75

adamziel added the [Type] Enhancement New feature or request label Oct 14, 2024

adamziel requested a review from a team as a code owner October 14, 2024 17:55

adamziel added this to the Data Liberation: URL Rewriting milestone Oct 14, 2024

adamziel changed the title ~~[Data liberation] Prototype wp_rewrite_urls()~~ [Data liberation] wp_rewrite_urls() Oct 14, 2024

adamziel mentioned this pull request Oct 14, 2024

Tracking Issue: Next-gen PHP Importers for Data Liberation #1894

Open

91 tasks

adamziel added 20 commits October 14, 2024 23:08

Add PHPCS and CBF

0633e6f

Update HTML API, fix unit tests

4406fcf

Merge branch 'trunk' into data-liberation-bring-in-php-parsers

0cfd334

Bump CI PHP version to 8.1

b90a9d6

Adjust the CI setup for PHP

081535b

Run npm instlal insteaf of installing just nx

aca88fe

Use the correct nx project name

897af50

Remove the network functions and only lint the src directory

f7679b0

Remove special casing for direct matching pathname prefixes

5b9ec7d

Fix linting errors

97fed71

Move the additional functions to pbpcbf.php

96c1ce4

Replace iterate_urls with url_matches

e15408a

Lint PHP

b788eea

Thoroughly test WP_URL_In_Text_Processor

b83933c

Enable tests for WP_Block_Markup_Processor

fb0204c

Enable all PHPUnit tests

b1ea8dc

Enable URLParserWHATWGComplianceTests

4335044

move $is_relative declaration clsoer to where it's used

91863ca

Add a single tricky test case for wp_rewrite_urls()

d2aeea4

Preserve urlencoded data in the rewritten path

60db1e1

adamziel added 7 commits October 28, 2024 17:12

Unit test urldecoding UTF-8 data

2da0386

Lint

54bea02

Remove messing with private WP_HTML_Tag_Processor attributes

54c901d

Remove the commented out dead code from WP_URL_In_Text_Processor

a62532b

Uncomment the public suffix list verification

238decd

PHP 8.1 compat

37622ab

PHP 8.1 compliance

e12190f

adamziel mentioned this pull request Oct 28, 2024

[Data Liberation] Add XML API, Stream API, WXR URL Rewriter API #1952

Merged

adamziel merged commit e5813df into trunk Oct 28, 2024
10 checks passed

adamziel deleted the data-liberation-bring-in-php-parsers branch October 28, 2024 23:14

brandonpayton reviewed Dec 2, 2024

View reviewed changes

adamziel changed the title ~~[Data liberation] wp_rewrite_urls()~~ [Data Liberation] wp_rewrite_urls() Dec 4, 2024

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Motivation for the change, related issues

Details

Processing tricky inputs

Remaining work

Follow-up work

Testing Instructions (or ideally a Blueprint)

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adamziel commented Oct 28, 2024

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