Retrieve feed, add to database (#4)

2024-04-09 21:16:34 -04:00
parent c89e6af346
commit 5c92c8c7d6
3 changed files with 104 additions and 0 deletions
--- a/src/lib/Feed.php
+++ b/src/lib/Feed.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * Feed retrieval, parsing, and manipulation
+ */
+class Feed {
+
+    /**
+     * Parse a feed into an XML tree
+     * @param string $content The feed's RSS content
+     * @return array|SimpleXMLElement[]|string[] [ 'ok' => feed ] if successful, [ 'error' => message] if not
+     */
+    public static function parseFeed(string $content): array {
+        try {
+            return [ 'ok' => new SimpleXMLElement($content) ];
+        } catch (Exception $ex) {
+            return [ 'error' => $ex->getMessage() ];
+        }
+    }
+
+    /**
+     * Retrieve the feed
+     * @param string $url
+     * @return array|SimpleXMLElement[]|string[] [ 'ok' => feedXml, 'url' => actualUrl ] if successful, [ 'error' => message ] if not
+     */
+    public static function retrieveFeed(string $url): array {
+        $feedReq = curl_init($url);
+        curl_setopt($feedReq, CURLOPT_FOLLOWLOCATION, true);
+        curl_setopt($feedReq, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($feedReq, CURLOPT_CONNECTTIMEOUT, 5);
+        curl_setopt($feedReq, CURLOPT_TIMEOUT,        15);
+
+        $feedContent = curl_exec($feedReq);
+
+        $result = array();
+        $error  = curl_error($feedReq);
+        $code   = curl_getinfo($feedReq, CURLINFO_RESPONSE_CODE);
+        if ($error) {
+            $result['error'] = $error;
+        } else if ($code == 200) {
+            $parsed = self::parseFeed($feedContent);
+            if (array_key_exists('error', $parsed)) {
+                $result['error'] = $parsed['error'];
+            } else {
+                $result['ok']  = $parsed['ok'];
+                $result['url'] = curl_getinfo($feedReq, CURLINFO_EFFECTIVE_URL);
+            }
+        } else {
+            $result['error'] = "HTTP Code $code: $feedContent";
+        }
+
+        curl_close($feedReq);
+        return $result;
+    }
+
+    /**
+     * Add an RSS feed
+     * @param string $url The URL of the RSS feed to add
+     * @return array [ 'ok' => true ] if successful, [ 'error' => message ] if not
+     */
+    public static function add(string $url): array {
+        $feed = self::retrieveFeed($url);
+        if (array_key_exists('error', $feed)) return $feed;
+
+        $channel = $feed['ok']->channel;
+        $feedId = Data::addFeed($feed['url'], (string) $channel->title, (string) $channel->lastBuildDate);
+
+        return [ 'ok' => true ];
+    }
+}