easyfonts / src / Detect / StylesheetFetcher.php

StylesheetFetcher.php in EasyFonts – Host Google Fonts Locally, Fast & Auto-Optimize, GDPR Compliant 2.0.1, at src/Detect/StylesheetFetcher.php

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1	<?php
2	/**
3	* Fetches the contents of linked stylesheets so fonts hidden inside theme /
4	* plugin / CDN CSS can be detected — the capability plain output-buffer
5	* scanners miss.
6	*
7	* @package EasyFonts
8	*/
9
10	namespace EasyFonts\Detect;
11
12	use EasyFonts\Fonts\Downloader;
13
14	defined( 'ABSPATH' ) \|\| exit;
15
16	/**
17	* Resolves stylesheet URLs to CSS contents (disk for local, HTTP for external).
18	*/
19	class StylesheetFetcher {
20
21	/**
22	* Already-processed URLs this request (avoids duplicate work).
23	*
24	* @var array<string,bool>
25	*/
26	private array $seen = array();
27
28	/**
29	* Read a same-origin stylesheet from disk.
30	*
31	* @param string $url Absolute or root-relative URL.
32	* @return string\|null
33	*/
34	public function read_local( string $url ): ?string {
35	$url = $this->normalize( $url );
36
37	if ( isset( $this->seen[ $url ] ) ) {
38	return null;
39	}
40
41	$this->seen[ $url ] = true;
42
43	$path = $this->url_to_path( $url );
44
45	if ( null === $path \|\| ! is_file( $path ) ) {
46	return null;
47	}
48
49	$css = @file_get_contents( $path ); // phpcs:ignore WordPress.WP.AlternativeFunctions
50
51	return false === $css ? null : $css;
52	}
53
54	/**
55	* Fetch an external stylesheet over HTTP (once).
56	*
57	* @param string $url URL.
58	* @param Downloader $downloader Downloader.
59	* @return string\|null
60	*/
61	public function read_external( string $url, Downloader $downloader ): ?string {
62	$url = $this->normalize( $url );
63
64	if ( isset( $this->seen[ $url ] ) ) {
65	return null;
66	}
67
68	$this->seen[ $url ] = true;
69
70	return $downloader->fetch_css( $url );
71	}
72
73	/**
74	* Is this URL same-origin?
75	*
76	* @param string $url URL.
77	* @return bool
78	*/
79	public function is_local( string $url ): bool {
80	$url = $this->normalize( $url );
81	$home = home_url();
82
83	return str_starts_with( $url, $home ) \|\| str_starts_with( $url, '/' );
84	}
85
86	/**
87	* Should we skip this stylesheet entirely (core, our own cache, etc.)?
88	*
89	* @param string $url URL.
90	* @return bool
91	*/
92	public function is_skippable( string $url ): bool {
93	foreach ( array( 'wp-includes', '/easyfonts/', 'fonts.googleapis.com', 'fonts.bunny.net' ) as $needle ) {
94	if ( false !== strpos( $url, $needle ) ) {
95	return true;
96	}
97	}
98
99	return false;
100	}
101
102	/**
103	* Map a same-origin URL to a filesystem path.
104	*
105	* @param string $url URL.
106	* @return string\|null
107	*/
108	private function url_to_path( string $url ): ?string {
109	$url = strtok( $url, '?' ); // Drop query (dynamic CSS handled elsewhere).
110
111	$content_url = content_url();
112
113	if ( str_starts_with( $url, $content_url ) ) {
114	return str_replace( $content_url, WP_CONTENT_DIR, $url );
115	}
116
117	$home = home_url();
118
119	if ( str_starts_with( $url, $home ) ) {
120	return str_replace( $home, untrailingslashit( ABSPATH ), $url );
121	}
122
123	if ( str_starts_with( $url, '/' ) ) {
124	return untrailingslashit( ABSPATH ) . $url;
125	}
126
127	return null;
128	}
129
130	/**
131	* Normalize protocol-relative / root-relative URLs to absolute.
132	*
133	* @param string $url URL.
134	* @return string
135	*/
136	private function normalize( string $url ): string {
137	$url = html_entity_decode( $url, ENT_QUOTES, 'UTF-8' );
138
139	if ( str_starts_with( $url, '//' ) ) {
140	return ( is_ssl() ? 'https:' : 'http:' ) . $url;
141	}
142
143	if ( str_starts_with( $url, '/' ) ) {
144	return home_url( $url );
145	}
146
147	return $url;
148	}
149	}
150