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| 1 | <?php |
| 2 | /** |
| 3 | * Fetches the posts currently featured on WordPress.com's Freshly Pressed. |
| 4 | * |
| 5 | * @package automattic/jetpack-newsletter |
| 6 | */ |
| 7 | |
| 8 | declare( strict_types = 1 ); |
| 9 | |
| 10 | namespace Automattic\Jetpack\Newsletter; |
| 11 | |
| 12 | use Automattic\Jetpack\Status\Host; |
| 13 | |
| 14 | /** |
| 15 | * Read the WordPress.com Freshly Pressed feed: straight from the database on |
| 16 | * Simple sites, and over the public API everywhere else. |
| 17 | */ |
| 18 | class Freshly_Pressed { |
| 19 | /** |
| 20 | * Where the cached list of posts is stored. |
| 21 | * |
| 22 | * @var string |
| 23 | */ |
| 24 | const TRANSIENT_KEY = 'jetpack_newsletter_freshly_pressed'; |
| 25 | |
| 26 | /** |
| 27 | * How long a successful response is cached for, in seconds. |
| 28 | * |
| 29 | * @var int |
| 30 | */ |
| 31 | const CACHE_TTL = HOUR_IN_SECONDS; |
| 32 | |
| 33 | /** |
| 34 | * How long a failed response is cached for, in seconds. |
| 35 | * |
| 36 | * Shorter than a success so an outage recovers quickly, but long enough that |
| 37 | * it doesn't become an outgoing request on every dashboard load. |
| 38 | * |
| 39 | * @var int |
| 40 | */ |
| 41 | const FAILURE_CACHE_TTL = 5 * MINUTE_IN_SECONDS; |
| 42 | |
| 43 | /** |
| 44 | * The WordPress.com endpoint listing the Freshly Pressed posts. |
| 45 | * |
| 46 | * @var string |
| 47 | */ |
| 48 | const API_URL = 'https://public-api.wordpress.com/rest/v1.1/freshly-pressed'; |
| 49 | |
| 50 | /** |
| 51 | * How many posts to show. |
| 52 | * |
| 53 | * @var int |
| 54 | */ |
| 55 | const POST_COUNT = 10; |
| 56 | |
| 57 | /** |
| 58 | * Get the posts currently featured on Freshly Pressed. |
| 59 | * |
| 60 | * @since 0.15.0 |
| 61 | * |
| 62 | * @return array[] { |
| 63 | * @type string $title The post title, as returned by the API. |
| 64 | * @type string $permalink A WordPress.com Reader link to the post. |
| 65 | * @type int $blog_id The ID of the site the post belongs to. |
| 66 | * @type int $post_id The ID of the post. |
| 67 | * } |
| 68 | */ |
| 69 | public static function get_posts(): array { |
| 70 | $cached = get_transient( self::TRANSIENT_KEY ); |
| 71 | if ( is_array( $cached ) ) { |
| 72 | return $cached; |
| 73 | } |
| 74 | |
| 75 | $posts = ( new Host() )->is_wpcom_simple() |
| 76 | ? self::query_wpcom_posts() |
| 77 | : self::fetch_posts_from_api(); |
| 78 | |
| 79 | // A null means the source failed; an empty array means it had nothing to |
| 80 | // show. Only the former is worth retrying soon. |
| 81 | set_transient( |
| 82 | self::TRANSIENT_KEY, |
| 83 | $posts ?? array(), |
| 84 | null === $posts ? self::FAILURE_CACHE_TTL : self::CACHE_TTL |
| 85 | ); |
| 86 | |
| 87 | return $posts ?? array(); |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Read the featured posts straight from the wpcom database. |
| 92 | * |
| 93 | * `FreshlyPressed::query()` only caches for logged-out visitors, so this is a |
| 94 | * real query every time and the caller's transient is what keeps it off the |
| 95 | * dashboard's critical path. |
| 96 | * |
| 97 | * @since 0.15.0 |
| 98 | * |
| 99 | * @return array[]|null The posts, or null if the wpcom plugin isn't available. |
| 100 | */ |
| 101 | private static function query_wpcom_posts(): ?array { |
| 102 | if ( ! class_exists( 'FreshlyPressed' ) ) { |
| 103 | $plugin = WP_CONTENT_DIR . '/plugins/freshly-pressed.php'; |
| 104 | if ( ! file_exists( $plugin ) ) { |
| 105 | return null; |
| 106 | } |
| 107 | require_once $plugin; |
| 108 | } |
| 109 | |
| 110 | // @phan-suppress-next-line PhanUndeclaredClassMethod -- wpcom-only class, guarded by the class_exists above. Remove once FreshlyPressed is added to wpcom's stub-defs.php and the regenerated stubs land. |
| 111 | $result = \FreshlyPressed::get_available_posts( array( 'number' => self::POST_COUNT ) ); |
| 112 | |
| 113 | if ( ! isset( $result['posts'] ) || ! is_array( $result['posts'] ) ) { |
| 114 | return null; |
| 115 | } |
| 116 | |
| 117 | $posts = array(); |
| 118 | foreach ( $result['posts'] as $featured ) { |
| 119 | if ( empty( $featured['blog_id'] ) || empty( $featured['post_id'] ) ) { |
| 120 | continue; |
| 121 | } |
| 122 | |
| 123 | // A post can be unpublished or deleted after being featured. |
| 124 | $post = get_blog_post( $featured['blog_id'], $featured['post_id'] ); |
| 125 | if ( empty( $post ) ) { |
| 126 | continue; |
| 127 | } |
| 128 | |
| 129 | // An untitled post would render as a link with nothing to click. |
| 130 | $title = trim( (string) $post->post_title ); |
| 131 | if ( '' === $title ) { |
| 132 | continue; |
| 133 | } |
| 134 | |
| 135 | $posts[] = self::format_post( |
| 136 | (int) $featured['blog_id'], |
| 137 | (int) $featured['post_id'], |
| 138 | $title |
| 139 | ); |
| 140 | } |
| 141 | |
| 142 | return $posts; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Fetch the featured posts from the WordPress.com public API. |
| 147 | * |
| 148 | * @since 0.15.0 |
| 149 | * |
| 150 | * @return array[]|null The posts, or null if the request failed. |
| 151 | */ |
| 152 | private static function fetch_posts_from_api(): ?array { |
| 153 | $response = wp_remote_get( |
| 154 | add_query_arg( |
| 155 | array( |
| 156 | 'number' => self::POST_COUNT, |
| 157 | // Without this the API returns the full content of every post. |
| 158 | 'fields' => 'ID,site_ID,title', |
| 159 | ), |
| 160 | self::API_URL |
| 161 | ), |
| 162 | array( 'timeout' => 5 ) |
| 163 | ); |
| 164 | |
| 165 | if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) { |
| 166 | return null; |
| 167 | } |
| 168 | |
| 169 | $body = json_decode( wp_remote_retrieve_body( $response ), true ); |
| 170 | if ( ! isset( $body['posts'] ) || ! is_array( $body['posts'] ) ) { |
| 171 | return null; |
| 172 | } |
| 173 | |
| 174 | $posts = array(); |
| 175 | foreach ( $body['posts'] as $post ) { |
| 176 | // An untitled post would render as a link with nothing to click. |
| 177 | $title = trim( (string) ( $post['title'] ?? '' ) ); |
| 178 | if ( empty( $post['ID'] ) || empty( $post['site_ID'] ) || '' === $title ) { |
| 179 | continue; |
| 180 | } |
| 181 | |
| 182 | $posts[] = self::format_post( (int) $post['site_ID'], (int) $post['ID'], $title ); |
| 183 | } |
| 184 | |
| 185 | return $posts; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Shape one post the way the widget expects it. |
| 190 | * |
| 191 | * @since 0.15.0 |
| 192 | * |
| 193 | * @param int $blog_id The ID of the site the post belongs to. |
| 194 | * @param int $post_id The ID of the post. |
| 195 | * @param string $title The post title. |
| 196 | * @return array The formatted post. |
| 197 | */ |
| 198 | private static function format_post( int $blog_id, int $post_id, string $title ): array { |
| 199 | return array( |
| 200 | 'title' => $title, |
| 201 | 'permalink' => add_query_arg( |
| 202 | array( |
| 203 | 'algo' => 'freshly-pressed', |
| 204 | 'ref' => 'dashboard_widget', |
| 205 | ), |
| 206 | sprintf( 'https://wordpress.com/reader/blogs/%d/posts/%d', $blog_id, $post_id ) |
| 207 | ), |
| 208 | 'blog_id' => $blog_id, |
| 209 | 'post_id' => $post_id, |
| 210 | ); |
| 211 | } |
| 212 | } |