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Feed.phpを追加しました。

2021/07/23 10:53

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kumagaya31

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test CHANGED Viewed

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test CHANGED Viewed

@@ -24,7 +24,7 @@
-### 該当のソースコード
+### Sample.php
@@ -131,3 +131,551 @@
 ```
+### Feed.php
+```PHP
+<?php
+/**
+ * RSS for PHP - small and easy-to-use library for consuming an RSS Feed
+ *
+ * @copyright  Copyright (c) 2008 David Grudl
+ * @license    New BSD License
+ * @version    1.5
+ */
+class Feed
+{
+	/** @var int */
+	public static $cacheExpire = '1 day';
+	/** @var string */
+	public static $cacheDir;
+	/** @var string */
+	public static $userAgent = 'FeedFetcher-Google';
+	/** @var SimpleXMLElement */
+	protected $xml;
+	/**
+	 * Loads RSS or Atom feed.
+	 * @param  string
+	 * @param  string
+	 * @param  string
+	 * @return Feed
+	 * @throws FeedException
+	 */
+	public static function load($url, $user = null, $pass = null)
+	{
+		$xml = self::loadXml($url, $user, $pass);
+		if ($xml->channel) {
+			return self::fromRss($xml);
+		} else {
+			return self::fromAtom($xml);
+		}
+	}
+	/**
+	 * Loads RSS feed.
+	 * @param  string  RSS feed URL
+	 * @param  string  optional user name
+	 * @param  string  optional password
+	 * @return Feed
+	 * @throws FeedException
+	 */
+	public static function loadRss($url, $user = null, $pass = null)
+	{
+		return self::fromRss(self::loadXml($url, $user, $pass));
+	}
+	/**
+	 * Loads Atom feed.
+	 * @param  string  Atom feed URL
+	 * @param  string  optional user name
+	 * @param  string  optional password
+	 * @return Feed
+	 * @throws FeedException
+	 */
+	public static function loadAtom($url, $user = null, $pass = null)
+	{
+		return self::fromAtom(self::loadXml($url, $user, $pass));
+	}
+	private static function fromRss(SimpleXMLElement $xml)
+	{
+		if (!$xml->channel) {
+			throw new FeedException('Invalid feed.');
+		}
+		self::adjustNamespaces($xml);
+		foreach ($xml->channel->item as $item) {
+			// converts namespaces to dotted tags
+			self::adjustNamespaces($item);
+			// generate 'url' & 'timestamp' tags
+			$item->url = (string) $item->link;
+			if (isset($item->{'dc:date'})) {
+				$item->timestamp = strtotime($item->{'dc:date'});
+			} elseif (isset($item->pubDate)) {
+				$item->timestamp = strtotime($item->pubDate);
+			}
+		}
+		$feed = new self;
+		$feed->xml = $xml->channel;
+		return $feed;
+	}
+	private static function fromAtom(SimpleXMLElement $xml)
+	{
+		if (!in_array('http://www.w3.org/2005/Atom', $xml->getDocNamespaces(), true)
+			&& !in_array('http://purl.org/atom/ns#', $xml->getDocNamespaces(), true)
+		) {
+			throw new FeedException('Invalid feed.');
+		}
+		// generate 'url' & 'timestamp' tags
+		foreach ($xml->entry as $entry) {
+			$entry->url = (string) $entry->link['href'];
+			$entry->timestamp = strtotime($entry->updated);
+		}
+		$feed = new self;
+		$feed->xml = $xml;
+		return $feed;
+	}
+	/**
+	 * Returns property value. Do not call directly.
+	 * @param  string  tag name
+	 * @return SimpleXMLElement
+	 */
+	public function __get($name)
+	{
+		return $this->xml->{$name};
+	}
+	/**
+	 * Sets value of a property. Do not call directly.
+	 * @param  string  property name
+	 * @param  mixed   property value
+	 * @return void
+	 */
+	public function __set($name, $value)
+	{
+		throw new Exception("Cannot assign to a read-only property '$name'.");
+	}
+	/**
+	 * Converts a SimpleXMLElement into an array.
+	 * @param  SimpleXMLElement
+	 * @return array
+	 */
+	public function toArray(SimpleXMLElement $xml = null)
+	{
+		if ($xml === null) {
+			$xml = $this->xml;
+		}
+		if (!$xml->children()) {
+			return (string) $xml;
+		}
+		$arr = [];
+		foreach ($xml->children() as $tag => $child) {
+			if (count($xml->$tag) === 1) {
+				$arr[$tag] = $this->toArray($child);
+			} else {
+				$arr[$tag][] = $this->toArray($child);
+			}
+		}
+		return $arr;
+	}
+	/**
+	 * Load XML from cache or HTTP.
+	 * @param  string
+	 * @param  string
+	 * @param  string
+	 * @return SimpleXMLElement
+	 * @throws FeedException
+	 */
+	private static function loadXml($url, $user, $pass)
+	{
+		$e = self::$cacheExpire;
+		$cacheFile = self::$cacheDir . '/feed.' . md5(serialize(func_get_args())) . '.xml';
+		if (self::$cacheDir
+			&& (time() - @filemtime($cacheFile) <= (is_string($e) ? strtotime($e) - time() : $e))
+			&& $data = @file_get_contents($cacheFile)
+		) {
+			// ok
+		} elseif ($data = trim(self::httpRequest($url, $user, $pass))) {
+			if (self::$cacheDir) {
+				file_put_contents($cacheFile, $data);
+			}
+		} elseif (self::$cacheDir && $data = @file_get_contents($cacheFile)) {
+			// ok
+		} else {
+			throw new FeedException('Cannot load feed.');
+		}
+		return new SimpleXMLElement($data, LIBXML_NOWARNING | LIBXML_NOERROR | LIBXML_NOCDATA);
+	}
+	/**
+	 * Process HTTP request.
+	 * @param  string
+	 * @param  string
+	 * @param  string
+	 * @return string|false
+	 * @throws FeedException
+	 */
+	private static function httpRequest($url, $user, $pass)
+	{
+		if (extension_loaded('curl')) {
+			$curl = curl_init();
+			curl_setopt($curl, CURLOPT_URL, $url);
+			if ($user !== null || $pass !== null) {
+				curl_setopt($curl, CURLOPT_USERPWD, "$user:$pass");
+			}
+			curl_setopt($curl, CURLOPT_USERAGENT, self::$userAgent); // some feeds require a user agent
+			curl_setopt($curl, CURLOPT_HEADER, false);
+			curl_setopt($curl, CURLOPT_TIMEOUT, 20);
+			curl_setopt($curl, CURLOPT_ENCODING, '');
+			curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); // no echo, just return result
+			if (!ini_get('open_basedir')) {
+				curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true); // sometime is useful :)
+			}
+			$result = curl_exec($curl);
+			return curl_errno($curl) === 0 && curl_getinfo($curl, CURLINFO_HTTP_CODE) === 200
+				? $result
+				: false;
+		} else {
+			$context = null;
+			if ($user !== null && $pass !== null) {
+				$options = [
+					'http' => [
+						'method' => 'GET',
+						'header' => 'Authorization: Basic ' . base64_encode($user . ':' . $pass) . "\r\n",
+					],
+				];
+				$context = stream_context_create($options);
+			}
+			return file_get_contents($url, false, $context);
+		}
+	}
+	/**
+	 * Generates better accessible namespaced tags.
+	 * @param  SimpleXMLElement
+	 * @return void
+	 */
+	private static function adjustNamespaces($el)
+	{
+		foreach ($el->getNamespaces(true) as $prefix => $ns) {
+			$children = $el->children($ns);
+			foreach ($children as $tag => $content) {
+				$el->{$prefix . ':' . $tag} = $content;
+			}
+		}
+	}
+}
+/**
+ * An exception generated by Feed.
+ */
+class FeedException extends Exception
+{
+}
+```