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| 1 | <?php |
| 2 | /** |
| 3 | * Share URLs for sharing buttons that send readers to an address they enter, such as a Mastodon instance. |
| 4 | * |
| 5 | * @package automattic/jetpack-sharing-likes |
| 6 | */ |
| 7 | |
| 8 | declare( strict_types = 1 ); |
| 9 | |
| 10 | namespace Automattic\Jetpack\Sharing_Likes; |
| 11 | |
| 12 | /** |
| 13 | * Builds an endpoint URL on a site a reader names, and the prompt URL to ask them again. |
| 14 | * |
| 15 | * @since 0.6.0 |
| 16 | */ |
| 17 | final class Share_Destination { |
| 18 | |
| 19 | /** |
| 20 | * Rewrite http:// addresses to https://. |
| 21 | * |
| 22 | * @var bool |
| 23 | */ |
| 24 | public const UPGRADE_HTTP = true; |
| 25 | |
| 26 | /** |
| 27 | * Keep http:// addresses as entered. |
| 28 | * |
| 29 | * @var bool |
| 30 | */ |
| 31 | public const KEEP_HTTP = false; |
| 32 | |
| 33 | /** |
| 34 | * Build an endpoint URL on the site at the address a reader entered. |
| 35 | * |
| 36 | * @since 0.6.0 |
| 37 | * |
| 38 | * @param string $address Address the reader entered, with or without a scheme. |
| 39 | * @param string $path Path to append to the address, e.g. 'share'. |
| 40 | * @param bool $upgrade_http self::UPGRADE_HTTP or self::KEEP_HTTP. |
| 41 | * @return string|null Endpoint URL without a query string, or null if the address is not usable. |
| 42 | */ |
| 43 | public static function get_endpoint( string $address, string $path, bool $upgrade_http ): ?string { |
| 44 | // Pasted addresses can carry invisible characters, like a zero-width space, that trim() misses. |
| 45 | $address = preg_replace( '/^[\s\p{Cf}]+|[\s\p{Cf}]+$/u', '', $address ) ?? trim( $address ); |
| 46 | if ( ! preg_match( '#^[a-z][a-z0-9+.-]*://#i', $address ) ) { |
| 47 | $address = 'https://' . $address; |
| 48 | } |
| 49 | |
| 50 | $parts = wp_parse_url( $address ); |
| 51 | if ( ! is_array( $parts ) || empty( $parts['host'] ) || empty( $parts['scheme'] ) ) { |
| 52 | return null; |
| 53 | } |
| 54 | |
| 55 | $scheme = strtolower( $parts['scheme'] ); |
| 56 | if ( 'https' !== $scheme && 'http' !== $scheme ) { |
| 57 | return null; |
| 58 | } |
| 59 | if ( $upgrade_http ) { |
| 60 | $scheme = 'https'; |
| 61 | } |
| 62 | |
| 63 | // In https://example.com@example.org the host is example.org, not the name the reader sees first. |
| 64 | if ( isset( $parts['user'] ) || isset( $parts['pass'] ) ) { |
| 65 | return null; |
| 66 | } |
| 67 | |
| 68 | // IDNA treats these full-width and ideographic full stops as dots, as in mstdn。jp. |
| 69 | $host = str_replace( array( "\u{3002}", "\u{FF0E}", "\u{FF61}" ), '.', $parts['host'] ); |
| 70 | if ( ! preg_match( '/^[\p{L}\p{M}\p{N}.-]+$/u', $host ) ) { |
| 71 | return null; |
| 72 | } |
| 73 | |
| 74 | $url = $scheme . '://' . $host; |
| 75 | if ( isset( $parts['port'] ) ) { |
| 76 | $url .= ':' . $parts['port']; |
| 77 | } |
| 78 | $url .= rtrim( $parts['path'] ?? '', '/' ) . '/' . ltrim( $path, '/' ); |
| 79 | |
| 80 | $url = esc_url_raw( $url, array( $scheme ) ); |
| 81 | |
| 82 | return '' === $url ? null : $url; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * URL of a service's address prompt for a post, where a reader can try another address. |
| 87 | * |
| 88 | * @since 0.6.0 |
| 89 | * |
| 90 | * @param int $post_id Post ID. |
| 91 | * @param string $service Sharing service short name, e.g. 'mastodon'. |
| 92 | * @return string |
| 93 | */ |
| 94 | public static function get_prompt_url( int $post_id, string $service ): string { |
| 95 | return add_query_arg( |
| 96 | array( |
| 97 | 'share' => $service, |
| 98 | 'nb' => 1, |
| 99 | ), |
| 100 | get_permalink( $post_id ) |
| 101 | ); |
| 102 | } |
| 103 | } |