README
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RSS V2 Parser
This package allows a user to parse rss feeds either from a string of xml or directly from a URL.
There is also a CompareItems function that will compare two RSS Feeds and return any items that do not exist in both.
Documentation
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Overview ¶
Package rssv2parser -
rss-v2-parser.go
structures have been defined using the standards laid out in https://validator.w3.org/feed/docs/rss2.html
Documentation for each structure has been pulled from the above link.
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
Types ¶
type Channel ¶
type Channel struct {
Title string `xml:"title"`
Link string `xml:"link"`
Description string `xml:"description"`
Language string `xml:"language"`
Copyright string `xml:"copyright"`
ManagingEditor string `xml:"managingEditor"`
WebMaster string `xml:"webMaster"`
PubDate string `xml:"pubDate"`
LastBuildDate string `xml:"lastBuildDate"`
Category string `xml:"category"`
Generator string `xml:"generator"`
Docs string `xml:"docs"`
Image Image `xml:"image"`
Cloud Cloud `xml:"cloud"`
TTL string `xml:"ttl"`
ItemList []Item `xml:"item"`
TextInput TextInput `xml:"textInput"`
SkipHours []Hour `xml:"skipHours"`
SkipDays []Day `xml:"skipDays"`
}
Channel - Required channel elements Here's a list of the required channel elements, each with a brief description, an example, and where available, a pointer to a more complete description.
Element Description Example title The name of the channel. It's how people refer to your service. If you have an HTML website that contains the same information as your RSS file, the title of your channel should be the same as the title of your website. GoUpstate.com News Headlines link The URL to the HTML website corresponding to the channel. http://www.goupstate.com/ description Phrase or sentence describing the channel. The latest news from GoUpstate.com, a Spartanburg Herald-Journal Web site.
Optional channel elements Here's a list of optional channel elements.
Element Description Example language The language the channel is written in. This allows aggregators to group all Italian language sites, for example, on a single page. A list of allowable values for this element, as provided by Netscape, is here. You may also use values defined by the W3C. en-us copyright Copyright notice for content in the channel. Copyright 2002, Spartanburg Herald-Journal managingEditor Email address for person responsible for editorial content. [email protected] (George Matesky) webMaster Email address for person responsible for technical issues relating to channel. [email protected] (Betty Guernsey) pubDate The publication date for the content in the channel. For example, the New York Times publishes on a daily basis, the publication date flips once every 24 hours. That's when the pubDate of the channel changes. All date-times in RSS conform to the Date and Time Specification of RFC 822, with the exception that the year may be expressed with two characters or four characters (four preferred). Sat, 07 Sep 2002 0:00:01 GMT lastBuildDate The last time the content of the channel changed. Sat, 07 Sep 2002 9:42:31 GMT category Specify one or more categories that the channel belongs to. Follows the same rules as the <item>-level category element. More info. <category>Newspapers</category> generator A string indicating the program used to generate the channel. MightyInHouse Content System v2.3 docs A URL that points to the documentation for the format used in the RSS file. It's probably a pointer to this page. It's for people who might stumble across an RSS file on a Web server 25 years from now and wonder what it is. http://backend.userland.com/rss cloud Allows processes to register with a cloud to be notified of updates to the channel, implementing a lightweight publish-subscribe protocol for RSS feeds. More info here. <cloud domain="rpc.sys.com" port="80" path="/RPC2" registerProcedure="pingMe" protocol="soap"/> ttl ttl stands for time to live. It's a number of minutes that indicates how long a channel can be cached before refreshing from the source. More info here. <ttl>60</ttl> image Specifies a GIF, JPEG or PNG image that can be displayed with the channel. More info here. textInput Specifies a text input box that can be displayed with the channel. More info here. skipHours A hint for aggregators telling them which hours they can skip. More info here. skipDays A hint for aggregators telling them which days they can skip. More info here.
type Cloud ¶
type Cloud struct {
}
Cloud - <cloud> sub-element of <channel> <cloud> is an optional sub-element of <channel>.
It specifies a web service that supports the rssCloud interface which can be implemented in HTTP-POST, XML-RPC or SOAP 1.1.
Its purpose is to allow processes to register with a cloud to be notified of updates to the channel, implementing a lightweight publish-subscribe protocol for RSS feeds.
<cloud domain="radio.xmlstoragesystem.com" port="80" path="/RPC2" registerProcedure="xmlStorageSystem.rssPleaseNotify" protocol="xml-rpc" />
In this example, to request notification on the channel it appears in, you would send an XML-RPC message to radio.xmlstoragesystem.com on port 80, with a path of /RPC2. The procedure to call is xmlStorageSystem.rssPleaseNotify.
A full explanation of this element and the rssCloud interface is here.
type Day ¶
type Day struct {
Day string `xml:"day"`
}
Day - skipDays
An XML element that contains up to seven <day> sub-elements whose value is Monday, Tuesday, Wednesday, Thursday, Friday, Saturday or Sunday. Aggregators may not read the channel during days listed in the skipDays element.
type Enclosure ¶
type Enclosure struct {
URL string `xml:"url,attr"`
Length string `xml:"length,attr"`
Type string `xml:"type,attr"`
}
Enclosure - <enclosure> sub-element of <item> <enclosure> is an optional sub-element of <item>.
It has three required attributes. url says where the enclosure is located, length says how big it is in bytes, and type says what its type is, a standard MIME type.
The url must be an http url.
<enclosure url="http://www.scripting.com/mp3s/weatherReportSuite.mp3" length="12216320" type="audio/mpeg" />
A use-case narrative for this element is here
type Hour ¶
type Hour struct {
Hour string `xml:"hour"`
}
Hour - An XML element that contains up to 24 <hour> sub-elements whose value is a number between 0 and 23, representing a time in GMT, when aggregators, if they support the feature, may not read the channel on hours listed in the skipHours element. The hour beginning at midnight is hour zero.
type Image ¶
type Image struct {
URL string `xml:"url"`
Title string `xml:"title"`
Link string `xml:"link"`
Width string `xml:"width"`
Height string `xml:"height"`
Description string `xml:"description"`
}
Image - <image> sub-element of <channel> <image> is an optional sub-element of <channel>, which contains three required and three optional sub-elements.
<url> is the URL of a GIF, JPEG or PNG image that represents the channel.
<title> describes the image, it's used in the ALT attribute of the HTML <img> tag when the channel is rendered in HTML.
<link> is the URL of the site, when the channel is rendered, the image is a link to the site. (Note, in practice the image <title> and <link> should have the same value as the channel's <title> and <link>.
Optional elements include <width> and <height>, numbers, indicating the width and height of the image in pixels. <description> contains text that is included in the TITLE attribute of the link formed around the image in the HTML rendering.
Maximum value for width is 144, default value is 88.
Maximum value for height is 400, default value is 31.
type Item ¶
type Item struct {
Title string `xml:"title"`
Author string `xml:"author"`
Description string `xml:"description"`
Link string `xml:"link"`
PubDate string `xml:"pubDate"`
GUID string `xml:"guid"`
Category string `xml:"category"`
Comments string `xml:"comments"`
Enclosure Enclosure `xml:"enclosure"`
Source string `xml:"source"`
}
Item - Elements of <item> A channel may contain any number of <item>s. An item may represent a "story" -- much like a story in a newspaper or magazine; if so its description is a synopsis of the story, and the link points to the full story. An item may also be complete in itself, if so, the description contains the text (entity-encoded HTML is allowed), and the link and title may be omitted. All elements of an item are optional, however at least one of title or description must be present.
Element Description Example title The title of the item. Venice Film Festival Tries to Quit Sinking link The URL of the item. http://www.nytimes.com/2002/09/07/movies/07FEST.html description The item synopsis. Some of the most heated chatter at the Venice Film Festival this week was about the way that the arrival of the stars at the Palazzo del Cinema was being staged. author Email address of the author of the item. More. [email protected] category Includes the item in one or more categories. More. Simpsons Characters comments URL of a page for comments relating to the item. More. http://www.myblog.org/cgi-local/mt/mt-comments.cgi?entry_id=290 enclosure Describes a media object that is attached to the item. More. <enclosure url="http://live.curry.com/mp3/celebritySCms.mp3" length="1069871" type="audio/mpeg"/> guid A string that uniquely identifies the item. More. <guid isPermaLink="true">http://inessential.com/2002/09/01.php#a2</guid> pubDate Indicates when the item was published. More. Sun, 19 May 2002 15:21:36 GMT source The RSS channel that the item came from. More. <source url="http://www.quotationspage.com/data/qotd.rss">Quotes of the Day</source>
func CompareItems ¶
CompareItems - This function will used to compare 2 RSS xml item objects and will return a list of differing items
func CompareItemsBetweenOldAndNew ¶
CompareItemsBetweenOldAndNew - This function will used to compare 2 RSS xml item objects and will return a list of items that are specifically in the newer feed but not in the older feed
type RSSV2 ¶
type RSSV2 struct {
XMLName xml.Name `xml:"rss"`
Version string `xml:"version,attr"`
Channel Channel `xml:"channel"`
}
RSSV2 - What is RSS? RSS is a Web content syndication format.
Its name is an acronym for Really Simple Syndication.
RSS is dialect of XML. All RSS files must conform to the XML 1.0 specification, as published on the World Wide Web Consortium (W3C) website.
At the top level, a RSS document is a <rss> element, with a mandatory attribute called version, that specifies the version of RSS that the document conforms to. If it conforms to this specification, the version attribute must be 2.0.
Subordinate to the <rss> element is a single <channel> element, which contains information about the channel (metadata) and its contents.
Sample files Here are sample files for: RSS 0.91, 0.92 and 2.0.
Note that the sample files may point to documents and services that no longer exist. The 0.91 sample was created when the 0.91 docs were written. Maintaining a trail of samples seems like a good idea.
About this document This document represents the status of RSS as of the Fall of 2002, version 2.0.1.
It incorporates all changes and additions, starting with the basic spec for RSS 0.91 (June 2000) and includes new features introduced in RSS 0.92 (December 2000) and RSS 0.94 (August 2002).
Change notes are here.
First we document the required and optional sub-elements of <channel>; and then document the sub-elements of <item>. The final sections answer frequently asked questions, and provide a roadmap for future evolution, and guidelines for extending RSS.
func ParseString ¶
ParseString will be used to parse strings and will return the Rss object
type TextInput ¶
type TextInput struct {
Title string `xml:"title"`
Description string `xml:"description"`
Name string `xml:"name"`
Link string `xml:"link"`
}
TextInput - <textInput> sub-element of <channel> A channel may optionally contain a <textInput> sub-element, which contains four required sub-elements.
<title> -- The label of the Submit button in the text input area.
<description> -- Explains the text input area.
<name> -- The name of the text object in the text input area.
<link> -- The URL of the CGI script that processes text input requests.
The purpose of the <textInput> element is something of a mystery. You can use it to specify a search engine box. Or to allow a reader to provide feedback. Most aggregators ignore it.
Source Files