Convert JSONFeed to RSS

jsonfeed2rss.php

<?php

//Convert JSONfeed to RSS in a single function as a drop-in to make adding JSONfeed
//support to an aggregator easier
function convert_jsonfeed_to_rss($content = NULL, $max = NULL)
{
    //Test if the content is actual JSON
    json_decode($content);
    if( json_last_error() !== JSON_ERROR_NONE) return FALSE;

    //Now, is it valid JSONFeed?
    $jsonFeed = json_decode($content, TRUE);
    if (!isset($jsonFeed['version'])) return FALSE;
    if (!isset($jsonFeed['title'])) return FALSE;
    if (!isset($jsonFeed['items'])) return FALSE;

    //Decode the feed to a PHP array
    $jf = json_decode($content, TRUE);

    //Get the latest item publish date to use as the channel pubDate
    $latestDate = 0;
    foreach ($jf['items'] as $item) {
        if (strtotime($item['date_published']) > $latestDate) $latestDate = strtotime($item['date_published']);
    }
    $lastBuildDate = date(DATE_RSS, $latestDate);

    //Create the RSS feed
    $xmlFeed = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"></rss>');
    $xmlFeed->addChild("channel");

    //Required elements
    $xmlFeed->channel->addChild("title", $jf['title']);
    $xmlFeed->channel->addChild("pubDate", $lastBuildDate);
    $xmlFeed->channel->addChild("lastBuildDate", $lastBuildDate);

    //Optional elements
    if (isset($jf['description'])) $xmlFeed->channel->description = $jf['description'];
    if (isset($jf['home_page_url'])) $xmlFeed->channel->link = $jf['home_page_url'];

    //Items
    foreach ($jf['items'] as $item) {
        $newItem = $xmlFeed->channel->addChild('item');

        //Standard stuff
        if (isset($item['id'])) $newItem->addChild('guid', $item['id']);
        if (isset($item['title'])) $newItem->addChild('title', $item['title']);
        if (isset($item['content_text'])) $newItem->addChild('description', $item['content_text']);
        if (isset($item['content_html'])) $newItem->addChild('description', $item['content_html']);
        if (isset($item['date_published'])) $newItem->addChild('pubDate', $item['date_published']);
        if (isset($item['url'])) $newItem->addChild('link', $item['url']);

        //Enclosures?
        if(isset($item['attachments'])) {
            foreach($item['attachments'] as $attachment) {
                $enclosure = $newItem->addChild('enclosure');
                $enclosure['url'] = $attachment['url'];
                $enclosure['type'] = $attachment['mime_type'];
                $enclosure['length'] = $attachment['size_in_bytes'];
            }
        }
    }

    //Make the output pretty
    $dom = new DOMDocument("1.0");
    $dom->preserveWhiteSpace = false;
    $dom->formatOutput = true;
    $dom->loadXML($xmlFeed->asXML());
    return $dom->saveXML();
}


$content = @file_get_contents("http://timetable.manton.org/feed.json");
echo convert_jsonfeed_to_rss($content)."\n";

How can this be used on blogger json file and also get the full rss content of some feeds that don't show fully? E.G: http://www.thedevline.com/feeds/posts/default?alt=json

@julistip

like this
https://www.thedevline.com/feeds/posts/default

Hi, I came across your script today and was wondering if it could be used to convert this devotional json to rss feed. If yes, how would it be done? Here is the json link:
https://www.awmi.net/wp-content/themes/awmi-net-2018/inc/json/daily-devotional-data.json

How can this be used on blogger json file and also get the full rss content of some feeds that don't show fully? E.G: http://www.thedevline.com/feeds/posts/default?alt=json

Link not working

Thanks for this! Just used it to gain access to a JSON feed in my FreshRSS installation.

Oups... I'm having issues with the JSON from https://occitania.social/api/v1/timelines/public?local=true&only_media=false : produces null RSS. Any idea?

@aalcaine whilst that URL returns valid JSON data, it is not a valid JSON Feed (which is what this script expects to be given).

https://www.jsonfeed.org/version/1.1/

that URL returns valid JSON data, it is not a valid JSON Feed

Thank you @gingerbeardman :-( Let's see if Mastodon fixes that...

@aalcaine doubtful. Their API is designed to produce JSON data, not JSON Feeds.

They provid per-user RSS already, but not for the public timeline. Anyway, I think a public timeline would be too busy to make sense as an RSS feed.

If you still want to do it, a solution for you is to write some code to convert/wrap the Mastodon JSON data into a feed, and then you will be able to use this script. Good luck.