friends / feed-parsers / class-feed-parser-json-feed.php

class-feed-parser-json-feed.php in Friends 2.8.0, at feed-parsers/class-feed-parser-json-feed.php

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1	<?php
2	/**
3	* Friends jsonfeed Parser
4	*
5	* With this parser, we can import RSS and Atom Feeds for a friend.
6	*
7	* @package Friends
8	*/
9
10	namespace Friends;
11
12	/**
13	* This is the class for the feed part of the Friends Plugin.
14	*
15	* @since 1.0
16	*
17	* @package Friends
18	* @author Alex Kirk
19	*/
20	class Feed_Parser_JSON_Feed extends Feed_Parser_V2 {
21	const NAME = 'JSON Feed';
22	const URL = 'https://www.jsonfeed.org/';
23	const SLUG = 'jsonfeed';
24
25	/**
26	* Determines if this is a supported feed and to what degree we feel it's supported.
27	*
28	* @param string $url The url.
29	* @param string $mime_type The mime type.
30	* @param string $title The title.
31	* @param string\|null $content The content, it can't be assumed that it's always available.
32	*
33	* @return int Return 0 if unsupported, a positive value representing the confidence for the feed, use 10 if you're reasonably confident.
34	*/
35	public function feed_support_confidence( $url, $mime_type, $title, $content = null ) {
36	$confidence = 10;
37
38	$rewritten = $this->rewrite_known_url( $url );
39	if ( $rewritten ) {
40	$mime_type = $rewritten['type'];
41	$confidence *= 2;
42	}
43
44	switch ( $mime_type ) {
45	case 'application/feed+json':
46	return $confidence;
47	case 'application/json':
48	if ( $content ) {
49	return $confidence;
50
51	}
52	}
53
54	return 0;
55	}
56
57	/**
58	* Rewrite known URLs to their RSS feeds.
59	*
60	* @param string $url The url.
61	*
62	* @return array An equivalent link array.
63	*/
64	public function rewrite_known_url( $url ) {
65	$host = parse_url( strtolower( $url ), PHP_URL_HOST );
66
67	switch ( $host ) {
68	case 'micro.blog':
69	if ( preg_match( '#/([^/]+)$#', $url, $m ) ) {
70	return array(
71	'title' => 'Micro.blog: ' . $m[1],
72	'rel' => 'alternate',
73	'type' => 'application/feed+json',
74	'url' => 'https://micro.blog/posts/' . $m[1],
75	);
76	}
77	return array();
78	}
79
80	return array();
81	}
82
83	/**
84	* Format the feed title and autoselect the posts feed.
85	*
86	* @param array $feed_details The feed details.
87	*
88	* @return array The (potentially) modified feed details.
89	*/
90	public function update_feed_details( $feed_details ) {
91	$rewritten = $this->rewrite_known_url( $feed_details['url'] );
92	if ( $rewritten ) {
93	$feed_details = $rewritten;
94	}
95
96	return $feed_details;
97	}
98
99	/**
100	* Discover the feeds available at the URL specified.
101	*
102	* @param string $content The content for the URL is already provided here.
103	* @param string $url The url to search.
104	*
105	* @return array A list of supported feeds at the URL.
106	*/
107	public function discover_available_feeds( $content, $url ) {
108	return array();
109	}
110
111	/**
112	* Fetches a feed and returns the processed items.
113	*
114	* @param string $url The url.
115	* @param User_Feed $user_feed The user feed.
116	*
117	* @return array An array of feed items.
118	*/
119	public function fetch_feed( $url, User_Feed $user_feed = null ) {
120	$args = array();
121	$res = wp_safe_remote_request( $url, $args );
122
123	if ( is_wp_error( $res ) ) {
124	return $res;
125	}
126
127	$body = wp_remote_retrieve_body( $res );
128	$json = json_decode( $body );
129
130	return $this->parse_json( $json );
131	}
132
133	/**
134	* Parse the JSON object as a JSON Feed.
135	*
136	* @param object $json The parsed JSON.
137	*
138	* @return array An array of Feed items.
139	*/
140	public function parse_json( $json ) {
141	if ( ! isset( $json->items ) ) {
142	return null;
143	}
144
145	$feed_items = array();
146	foreach ( $json->items as $item ) {
147	$feed_item = new Feed_Item(
148	array(
149	'permalink' => $item->url,
150	)
151	);
152
153	if ( isset( $item->content_html ) ) {
154	$feed_item->content = $item->content_html;
155	} elseif ( isset( $item->content_text ) ) {
156	$feed_item->content = $item->content_text;
157	}
158
159	if ( isset( $item->title ) ) {
160	$feed_item->title = $item->title;
161	}
162	if ( isset( $item->authors ) && isset( $item->authors[0] ) && is_object( $item->authors[0] ) ) {
163	$feed_item->author = $item->authors[0]->name;
164	}
165	if ( isset( $item->date_published ) ) {
166	$feed_item->date = $item->date_published;
167	}
168	if ( isset( $item->date_modified ) ) {
169	$feed_item->updated_date = $item->date_modified;
170	if ( ! isset( $feed_item->date ) ) {
171	$feed_item->date = $feed_item->updated_date;
172	}
173	}
174	$feed_items[] = $feed_item;
175	}
176
177	return $feed_items;
178	}
179	}
180