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1<?php
2/**
3 * Instagram Gallery block and API helper.
4 *
5 * @package automattic/jetpack
6 */
7
8use Automattic\Jetpack\Connection\Client;
9use Automattic\Jetpack\Connection\Manager;
10
11/**
12 * Class Jetpack_Instagram_Gallery_Helper
13 */
14class Jetpack_Instagram_Gallery_Helper {
15    const TRANSIENT_KEY_PREFIX = 'jetpack_instagram_gallery_block_';
16
17    /**
18     * Check whether an Instagram access token is valid,
19     * or has been permanently deleted elsewhere.
20     *
21     * @param  string $access_token_id The ID of the external access token for Instagram.
22     * @return bool
23     */
24    public static function is_instagram_access_token_valid( $access_token_id ) {
25        $site_id = Manager::get_site_id();
26        if ( is_wp_error( $site_id ) ) {
27            return false;
28        }
29
30        if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
31            if ( ! class_exists( 'WPCOM_Instagram_Gallery_Helper' ) ) {
32                \require_lib( 'instagram-gallery-helper' );
33            }
34            $token = WPCOM_Instagram_Gallery_Helper::get_token( $access_token_id );
35            return ! is_wp_error( $token );
36        }
37
38        $response = Client::wpcom_json_api_request_as_blog(
39            sprintf( '/sites/%d/instagram/%d/check-token', $site_id, $access_token_id ),
40            2,
41            array( 'headers' => array( 'content-type' => 'application/json' ) ),
42            null,
43            'wpcom'
44        );
45        return 200 === wp_remote_retrieve_response_code( $response );
46    }
47
48    /**
49     * Get the Instagram Gallery.
50     *
51     * @param  string $access_token_id The ID of the external access token for Instagram.
52     * @param  int    $count           The number of Instagram posts to fetch.
53     * @return mixed
54     */
55    public static function get_instagram_gallery( $access_token_id, $count ) {
56        $site_id = Manager::get_site_id();
57        if ( is_wp_error( $site_id ) ) {
58            return $site_id;
59        }
60
61        $transient_key = self::TRANSIENT_KEY_PREFIX . $access_token_id;
62
63        // Check if the connection exists before trying to retrieve the cached gallery.
64        if ( ! self::is_instagram_access_token_valid( $access_token_id ) ) {
65            delete_transient( $transient_key );
66            return new WP_Error(
67                'instagram_connection_unavailable',
68                __( 'The requested Instagram connection is not available anymore.', 'jetpack' ),
69                403
70            );
71        }
72
73        $cached_gallery = get_transient( $transient_key );
74        if ( $cached_gallery ) {
75            $decoded_cached_gallery = json_decode( $cached_gallery );
76            // `images` can be an array of images or a string 'ERROR'.
77            $cached_count = is_array( $decoded_cached_gallery->images ) ? count( $decoded_cached_gallery->images ) : 0;
78            if ( $cached_count >= $count ) {
79                return $decoded_cached_gallery;
80            }
81        }
82
83        $response = Client::wpcom_json_api_request_as_blog(
84            sprintf( '/sites/%d/instagram/%d?count=%d', $site_id, $access_token_id, $count ),
85            2,
86            array( 'headers' => array( 'content-type' => 'application/json' ) ),
87            null,
88            'wpcom'
89        );
90        if ( is_wp_error( $response ) ) {
91            return $response;
92        }
93
94        $gallery = wp_remote_retrieve_body( $response );
95        set_transient( $transient_key, $gallery, HOUR_IN_SECONDS );
96        return json_decode( $gallery );
97    }
98}