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How To Discover RSS Feeds for a given URL

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猫巷女王i
猫巷女王i 2020-12-01 00:45

I get a URL from a user. I need to know:
a) is the URL a valid RSS feed?
b) if not is there a valid feed associated with that URL

using PHP/Javascript or s

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6条回答
  • 野的像风
    2020-12-01 01:27

    The Zend Feed class of the Zend-framework can automatically parse a webpage and list the available feeds.

    Example: 

    $feedArray = Zend_Feed::findFeeds('http://www.example.com/news.html');
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  • 走了就别回头了
    2020-12-01 01:29

    a) Retrieve it and try to parse it. If you can parse it, it's valid.

    b) Test if it's an HTML document (server sent text/html) MIME-type. If so, run it through an HTML parser and look for <link> elements with RSS feed relations.

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  • 滥情空心
    2020-12-01 01:33

    This link will allow you to validate the link against the RSS/Atom specifications using the W3C specs, but does require you to manually enter the url.

    There are a number of ways to do this programmatically, depending on your choice of language - in PHP, parsing the file as valid XML is a good way to start, then compare it to the relevant DTD.

    For b), if the link itself isn't a feed, you can parse it and look for a specified feed in the <head> section of the page, searching for a link whose type is "application/rss+xml", e.g:

    <link rel="alternate" title="RSS Feed" 
    href="http://www.example.com/rss-feed.xml" type="application/rss+xml" />

    This type of link is the one used by most browsers to "auto-discover" feeds (causing the RSS icon to appear in your address bar)

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  • 不知归路
    2020-12-01 01:35

    Found something that I wanted:

    Google's AJAX Feed API has a load feed and lookup feed function (Docs here).

    a) Load feed provides the feed (and feed status) in JSON

    b) Lookup feed provides the RSS feed for a given URL

    Theres also a find feed function that searches for RSS feeds based on a keyword.

    Planning to use this with JQuery's $.getJSON

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  • 旧时难觅i
    2020-12-01 01:35

    For Perl, there is Feed::Find , which does automate the discovery of syndication feeds from the webpage. The usage is quite simplicistic:

    use Feed::Find;
my @feeds = Feed::Find->find('http://example.com/');

    It first tries the link tags and then scans the a tags for files named .rss and something like that.

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  • 名媛妹妹
    2020-12-01 01:47

    Are you doing this in a specific language, or do you just want details about the RSS specification?

    In general, look for the XML prolog:

    <?xml version="1.0" encoding="UTF-8"?>

    followed by an <rss> element, but you might want to validate it as XML, fully validate it against a DTD, or verify that - for example, each URL referred to is valid, etc. More detail would help.

    UPDATE: Ah - PHP. I've found this library to be pretty useful: MagpieRSS

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