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rss.php
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<?php
// With some help from https://www.sanwebe.com/2013/07/creating-valid-rss-feed-using-php
header("Content-Type: text/xml; charset=utf-8", true);
// Return cached RSS feed, if it exists and if it was cached in the past hour
if(CACHE_RSS_FEEDS) {
if(file_exists("cache/rss/" . $_SERVER["REQUEST_URI"] . ".xml") && time() - filemtime("cache/rss/" . $_SERVER["REQUEST_URI"] . ".xml") < 60 * 60) {
echo file_get_contents("cache/rss/" . $_SERVER["REQUEST_URI"] . ".xml", true);
exit;
}
}
// Sort and filter
include "sort-and-filter.php";
// Get Subreddit feed
$jsonFeedFile = getFile("https://www.reddit.com/r/" . $subreddit . ".json", "redditJSON", "cache/reddit/$subreddit.json", 60 * 5);
$jsonFeedFileParsed = json_decode($jsonFeedFile, true);
$jsonFeedFileItems = $jsonFeedFileParsed["data"]["children"];
usort($jsonFeedFileItems, "sortByCreatedDate");
// Feed description text
$feedDescriptionText = "Hot posts in /r/";
$feedDescriptionText .= $subreddit;
if($thresholdScore) {
if(isset($_GET["score"]) && $_GET["score"]) {
$feedDescriptionText .= " at or above a score of ";
$feedDescriptionText .= $_GET["score"];
}
if(isset($_GET["threshold"]) && $_GET["threshold"]) {
$feedDescriptionText .= " at or above ";
$feedDescriptionText .= $thresholdPercentage;
$feedDescriptionText .= "% of monthly top posts' average score";
}
if(isset($_GET["averagePostsPerDay"]) && $_GET["averagePostsPerDay"]) {
$feedDescriptionText .= " (roughly ";
$feedDescriptionText .= $_GET["averagePostsPerDay"];
$feedDescriptionText .= " posts per day)";
}
}
// Create new DOM document
$xml = new DOMDocument("1.0", "UTF-8");
// Create "RSS" element
$rss = $xml->createElement("rss");
$rssNode = $xml->appendChild($rss);
$rssNode->setAttribute("version", "2.0");
// Set attributes
$rssNode->setAttribute("xmlns:dc", "http://purl.org/dc/elements/1.1/");
$rssNode->setAttribute("xmlns:content", "http://purl.org/rss/1.0/modules/content/");
$rssNode->setAttribute("xmlns:atom", "https://www.w3.org/2005/Atom");
// Create RFC822 Date format to comply with RFC822
$dateF = date("D, d M Y H:i:s T", time());
$buildDate = gmdate(DATE_RFC2822, strtotime($dateF));
// Create "channel" element under "RSS" element
$channel = $xml->createElement("channel");
$channelNode = $rssNode->appendChild($channel);
$channelImageNode = $rssNode->appendChild($channel);
// A feed should contain an atom:link element
// http://j.mp/1nuzqeC
$channelAtomLink = $xml->createElement("atom:link");
$channelAtomLink->setAttribute("href", "https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]");
$channelAtomLink->setAttribute("rel", "self");
$channelAtomLink->setAttribute("type", "application/rss+xml");
$channelNode->appendChild($channelAtomLink);
// Add general elements under "channel" node
$channelNode->appendChild($xml->createElement("title", "/r/" . $subreddit));
$channelNode->appendChild($xml->createElement("description", $feedDescriptionText));
$channelNode->appendChild($xml->createElement("link", "https://www.reddit.com/r/" . $subreddit));
$channelNode->appendChild($xml->createElement("language", "en-us"));
$channelNode->appendChild($xml->createElement("lastBuildDate", $buildDate));
$channelNode->appendChild($xml->createElement("generator", "PHP DOMDocument"));
$channelImageNode = $channelNode->appendChild($xml->createElement("image"));
$channelImageNode->appendChild($xml->createElement("url", "https://www.redditstatic.com/desktop2x/img/favicon/android-icon-192x192.png"));
// Loop through feed items
foreach($jsonFeedFileItems as $item) {
// Only show posts at or above score threshold
if ($item["data"]["score"] >= $thresholdScore) {
// Remove any utm junk from main item link
$itemDataUrl = $item["data"]["url"];
$itemDataUrl = preg_replace("/&?utm_(.*?)\=[^&]+/","","$itemDataUrl");
// Create a new node called "item"
$itemNode = $channelNode->appendChild($xml->createElement("item"));
// Item Title
$itemTitle = $item["data"]["title"];
if($item["data"]["domain"]) {
$itemTitle .= " (" . $item["data"]["domain"] . ")";
}
if(strpos($itemDataUrl,"imgur") !== false && strpos($itemDataUrl,"gallery") !== false) {
$itemTitle .= " (Gallery)";
}
$titleNode = $itemNode->appendChild($xml->createElement("title", $itemTitle));
// Item Link
$linkNode = $itemNode->appendChild($xml->createElement("link", $itemDataUrl));
// Unique identifier for the item (GUID)
$guidLink = $xml->createElement("guid", "https://www.reddit.com" . $item["data"]["permalink"]);
$guidLink->setAttribute("isPermaLink", "false");
$guid_node = $itemNode->appendChild($guidLink);
// Create "comments" node under "item"
if(strpos($item["data"]["domain"], "self.") == false) {
$commentsNode = $itemNode->appendChild($xml->createElement("comments", "https://www.reddit.com" . $item["data"]["permalink"]));
}
// Create "description" node under "item"
$descriptionNode = $itemNode->appendChild($xml->createElement("description"));
// Create description text for "description" node
$itemDescription = "";
// Description comments link
$itemDescription .= "<p><a href='https://www.reddit.com" . $item["data"]["permalink"] . "'>Post permalink</a> </p>";
// Add media if it exists
switch (true) {
// General embeds
case isset($item["data"]["media_embed"]["content"]):
$mediaEmbed = $item["data"]["media_embed"]["content"];
$mediaEmbed = str_replace("<", "<", $mediaEmbed);
$mediaEmbed = str_replace(">", ">", $mediaEmbed);
$itemDescription .= $mediaEmbed;
break;
case isset($item["data"]["secure_media_embed"]["content"]):
$mediaEmbed = $item["data"]["secure_media_embed"]["content"];
$mediaEmbed = str_replace("<", "<", $mediaEmbed);
$mediaEmbed = str_replace(">", ">", $mediaEmbed);
$itemDescription .= $mediaEmbed;
break;
case isset($item["data"]["secure_media"]["oembed"]["html"]):
$mediaEmbed = $item["data"]["secure_media"]["oembed"]["html"];
$mediaEmbed = str_replace("<", "<", $mediaEmbed);
$mediaEmbed = str_replace(">", ">", $mediaEmbed);
$itemDescription .= $mediaEmbed;
break;
// Imgur gifv
case strpos($item["data"]["url"], "imgur") && strpos($item["data"]["url"], "gifv"):
$mediaEmbed = "<video poster='" . str_replace(".gifv", "h.jpg", $item["data"]["url"]) . "' controls='true' preload='auto' autoplay='false' muted='muted' loop='loop' webkit-playsinline='' style='max-width: 90vw;'>
<source src='" . str_replace("gifv", "mp4", $item["data"]["url"]) . "' type='video/mp4'>
</video>";
$itemDescription .= $mediaEmbed;
break;
// Reddit videos
case $item["data"]["domain"] == "v.redd.it":
$mediaEmbed = "<video src='" . $item["data"]["secure_media"]["reddit_video"]["fallback_url"] . "' controls='true' preload='auto' autoplay='false' muted='muted' loop='loop' webkit-playsinline='' style='max-width: 90vw;'></video>";
$itemDescription .= $mediaEmbed;
break;
// Reddit images
case $item["data"]["domain"] == "i.redd.it":
$mediaEmbed = "<p><a href='" . $item["data"]["url"] . "'><img src='" . $item["data"]["url"] . "'></img></a></p>";
$itemDescription .= $mediaEmbed;
break;
// Preview images
case !empty($item["data"]["preview"]["images"]) && strpos($item["data"]["preview"]["images"][0]["source"]["url"],"redditmedia") !== false:
$mediaEmbed = "<p><img src='" . $item["data"]["preview"]["images"][0]["source"]["url"] . "' /></p>";
$itemDescription .= $mediaEmbed;
break;
// Image in URL
case strpos($itemDataUrl, "jpg") !== false || strpos($itemDataUrl, "jpeg") !== false || strpos($itemDataUrl, "png") !== false || strpos($itemDataUrl, "gif") !== false:
$itemDescription .= "<p><img src='" . $itemDataUrl . "' /></p>";
break;
// Imgur
case strpos($itemDataUrl, "imgur.com") !== false:
$itemDescription .= "<p><img src='" . $itemDataUrl . ".jpg' /></p>";
break;
// Livememe
case strpos($itemDataUrl, "livememe") !== false:
$imageUrl = str_replace(["http://www.livememe.com/", "https://www.livememe.com/"], "https://i.lvme.me/", $itemDataUrl);
$itemDescription .= "<p><img src='" . $imageUrl . ".jpg' /></p>";
break;
// Mercury-parsed lead image
case MERCURY_URL && strpos($item["data"]["domain"], "self.") == false:
$mercuryJSON = getFile($itemDataUrl, "mercuryJSON", "cache/mercury/" . filter_var($itemDataUrl, FILTER_SANITIZE_ENCODED) . ".json", 60 * 60 * 24 * 7);
if(!isset(json_decode($mercuryJSON)->message) || json_decode($mercuryJSON)->message != "Internal server error") {
$mercuryJSON = json_decode($mercuryJSON);
if ($mercuryJSON->lead_image_url) {
$itemDescription .= "<p><img src='" . $mercuryJSON->lead_image_url . "' /></p>";
}
}
break;
}
// Feed text content and string replacement
switch (true) {
// Selftext
case isset($item["data"]["selftext_html"]):
$selftext = $item["data"]["selftext_html"];
$selftext = str_replace("<", "<", $selftext);
$selftext = str_replace(">", ">", $selftext);
$selftext = str_replace("&quot;", '"', $selftext);
$selftext = str_replace("&#39;", "'", $selftext);
$itemDescription .= $selftext;
break;
// No selftext and domain contains self
case !isset($item["data"]["selftext_html"]) && strpos($item["data"]["domain"],"self.") !== false:
break;
// Mercury-parsed article content
case MERCURY_URL && strpos($item["data"]["domain"], "self.") == false && strpos($item["data"]["url"], "redd.it") == false:
$mercuryJSON = getFile($itemDataUrl, "mercuryJSON", "cache/mercury/" . filter_var($itemDataUrl, FILTER_SANITIZE_ENCODED) . ".json", 60 * 60 * 24 * 7);
if(!isset(json_decode($mercuryJSON)->message) || json_decode($mercuryJSON)->message != "Internal server error") {
if ($mercuryJSON = json_decode($mercuryJSON)) {
$itemDescription .= $mercuryJSON->content;
}
}
break;
}
// Add article's best comments
if(isset($_GET["comments"]) && $_GET["comments"] > 0) {
$commentsURL = "https://www.reddit.com/r/" . $item["data"]["subreddit"] . "/comments/" . $item["data"]["id"] . ".json?depth=1&showmore=0&limit=" . (intval($_GET["comments"]) + 1);
$commentsJSON = getFile($commentsURL, "redditJSON", "cache/reddit/" . $item["data"]["subreddit"] . "-comments-" . $item["data"]["id"] . $_GET["comments"] . ".json", 60 * 5);
$commentsJSONParsed = json_decode($commentsJSON, true);
$comments = $commentsJSONParsed[1]["data"]["children"];
if($comments[0]["data"]["author"] == "AutoModerator") {
unset($comments[0]);
$comments = array_values($comments);
}
if(count($comments) > $_GET["comments"]) {
$commentCount = $_GET["comments"];
} else {
$commentCount = count($comments);
}
if($commentCount) {
$itemDescription .= "<p> </p><hr><p> </p>";
if($commentCount == 1) {
$itemDescription .= "<p>Best comment</p>";
} elseif($commentCount > 1) {
$itemDescription .= "<p>Best comments</p>";
}
$itemDescription .= "<ol>";
for ($i = 0; $i < $commentCount; $i++) {
$itemDescription .= "<li>" . htmlspecialchars_decode($comments[$i]["data"]["body_html"]) . "<ul><li><a href='https://www.reddit.com" . $comments[$i]["data"]["permalink"] . "'><small>Permalink</small></a> | <a href='https://www.reddit.com/user/" . $comments[$i]["data"]["author"] . "'><small>Author</small></a></li></ul></li>";
}
$itemDescription .= "</ol>";
}
}
//fill description node with CDATA content
$descriptionContents = $xml->createCDATASection($itemDescription);
$descriptionNode->appendChild($descriptionContents);
//Published date
$pubDate = $xml->createElement("pubDate", date("r", $item["data"]["created_utc"]));
$pubDateNode = $itemNode->appendChild($pubDate);
}
// Prevent CPU from spiking
usleep(0.1 * 1000000);
}
// Cache RSS feed
if(CACHE_RSS_FEEDS) {
file_put_contents("cache/rss/" . $_SERVER["REQUEST_URI"] . ".xml", $xml->saveXML());
}
// Echo the feed
echo $xml->saveXML();
?>