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require 'rss/parser'
module RSS
##
# Atom is an XML-based document format that is used to describe 'feeds' of related information.
# A typical use is in a news feed where the information is periodically updated and which users
# can subscribe to. The Atom format is described in http://tools.ietf.org/html/rfc4287
#
# The Atom module provides support in reading and creating feeds.
#
# See the RSS module for examples consuming and creating feeds
module Atom
##
# The Atom URI W3C Namespace
URI = "http://www.w3.org/2005/Atom"
##
# The XHTML URI W3C Namespace
XHTML_URI = "http://www.w3.org/1999/xhtml"
module CommonModel
NSPOOL = {}
ELEMENTS = []
def self.append_features(klass)
super
klass.install_must_call_validator("atom", URI)
[
["lang", :xml],
["base", :xml],
].each do |name, uri, required|
klass.install_get_attribute(name, uri, required, [nil, :inherit])
end
klass.class_eval do
class << self
def required_uri
URI
end
def need_parent?
true
end
end
end
end
end
module ContentModel
module ClassMethods
def content_type
@content_type ||= nil
end
end
class << self
def append_features(klass)
super
klass.extend(ClassMethods)
klass.content_setup(klass.content_type, klass.tag_name)
end
end
def maker_target(target)
target
end
private
def setup_maker_element_writer
"#{self.class.name.split(/::/).last.downcase}="
end
def setup_maker_element(target)
target.__send__(setup_maker_element_writer, content)
super
end
end
module URIContentModel
class << self
def append_features(klass)
super
klass.class_eval do
@content_type = [nil, :uri]
include(ContentModel)
end
end
end
end
# The TextConstruct module is used to define a Text construct Atom element,
# which is used to store small quantities of human-readable text
#
# The TextConstruct has a type attribute, e.g. text, html, xhtml
module TextConstruct
def self.append_features(klass)
super
klass.class_eval do
[
["type", ""],
].each do |name, uri, required|
install_get_attribute(name, uri, required, :text_type)
end
content_setup
add_need_initialize_variable("xhtml")
class << self
def xml_getter
"xhtml"
end
def xml_setter
"xhtml="
end
end
end
end
attr_writer :xhtml
def xhtml
return @xhtml if @xhtml.nil?
if @xhtml.is_a?(XML::Element) and
[@xhtml.name, @xhtml.uri] == ["div", XHTML_URI]
return @xhtml
end
children = @xhtml
children = [children] unless children.is_a?(Array)
XML::Element.new("div", nil, XHTML_URI,
{"xmlns" => XHTML_URI}, children)
end
# Returns true if type is "xhtml"
def have_xml_content?
@type == "xhtml"
end
def atom_validate(ignore_unknown_element, tags, uri)
if have_xml_content?
if @xhtml.nil?
raise MissingTagError.new("div", tag_name)
end
unless [@xhtml.name, @xhtml.uri] == ["div", XHTML_URI]
raise NotExpectedTagError.new(@xhtml.name, @xhtml.uri, tag_name)
end
end
end
private
def maker_target(target)
target.__send__(self.class.name.split(/::/).last.downcase) {|x| x}
end
def setup_maker_attributes(target)
target.type = type
target.content = content
target.xml_content = @xhtml
end
end
# The PersonConstruct module is used to define a Person Atom element that can be
# used to describe a person, corporation, or similar entity
#
# The PersonConstruct has a Name, Uri, and Email child elements
module PersonConstruct
# Adds attributes for name, uri, and email to the +klass+
def self.append_features(klass)
super
klass.class_eval do
[
["name", nil],
["uri", "?"],
["email", "?"],
].each do |tag, occurs|
install_have_attribute_element(tag, URI, occurs, nil, :content)
end
end
end
def maker_target(target)
target.__send__("new_#{self.class.name.split(/::/).last.downcase}")
end
# The name of the person or entity
class Name < RSS::Element
include CommonModel
include ContentModel
end
# The URI of the person or entity
class Uri < RSS::Element
include CommonModel
include URIContentModel
end
# The email of the person or entity
class Email < RSS::Element
include CommonModel
include ContentModel
end
end
# Element used to describe an Atom date and time in the ISO 8601 format
#
# Examples:
# * 2013-03-04T15:30:02Z
# * 2013-03-04T10:30:02-05:00
module DateConstruct
def self.append_features(klass)
super
klass.class_eval do
@content_type = :w3cdtf
include(ContentModel)
end
end
# Raises NotAvailableValueError if element content is nil
def atom_validate(ignore_unknown_element, tags, uri)
raise NotAvailableValueError.new(tag_name, "") if content.nil?
end
end
module DuplicateLinkChecker
# Checks if there are duplicate links with the same type and hreflang attributes
# that have an alternate (or empty) rel attribute
#
# Raises a TooMuchTagError if there are duplicates found
def validate_duplicate_links(links)
link_infos = {}
links.each do |link|
rel = link.rel || "alternate"
next unless rel == "alternate"
key = [link.hreflang, link.type]
if link_infos.has_key?(key)
raise TooMuchTagError.new("link", tag_name)
end
link_infos[key] = true
end
end
end
# Atom feed element
#
# A Feed has several metadata attributes in addition to a number of Entry child elements
class Feed < RSS::Element
include RootElementMixin
include CommonModel
include DuplicateLinkChecker
install_ns('', URI)
[
["author", "*", :children],
["category", "*", :children, "categories"],
["contributor", "*", :children],
["generator", "?"],
["icon", "?", nil, :content],
["id", nil, nil, :content],
["link", "*", :children],
["logo", "?"],
["rights", "?"],
["subtitle", "?", nil, :content],
["title", nil, nil, :content],
["updated", nil, nil, :content],
["entry", "*", :children, "entries"],
].each do |tag, occurs, type, *args|
type ||= :child
__send__("install_have_#{type}_element",
tag, URI, occurs, tag, *args)
end
# Creates a new Atom feed
def initialize(version=nil, encoding=nil, standalone=nil)
super("1.0", version, encoding, standalone)
@feed_type = "atom"
@feed_subtype = "feed"
end
alias_method :items, :entries
# Returns true if there are any authors for the feed or any of the Entry
# child elements have an author
def have_author?
authors.any? {|author| !author.to_s.empty?} or
entries.any? {|entry| entry.have_author?(false)}
end
private
def atom_validate(ignore_unknown_element, tags, uri)
unless have_author?
raise MissingTagError.new("author", tag_name)
end
validate_duplicate_links(links)
end
def have_required_elements?
super and have_author?
end
def maker_target(maker)
maker.channel
end
def setup_maker_element(channel)
prev_dc_dates = channel.dc_dates.to_a.dup
super
channel.about = id.content if id
channel.dc_dates.replace(prev_dc_dates)
end
def setup_maker_elements(channel)
super
items = channel.maker.items
entries.each do |entry|
entry.setup_maker(items)
end
end
class Author < RSS::Element
include CommonModel
include PersonConstruct
end
class Category < RSS::Element
include CommonModel
[
["term", "", true],
["scheme", "", false, [nil, :uri]],
["label", ""],
].each do |name, uri, required, type|
install_get_attribute(name, uri, required, type)
end
private
def maker_target(target)
target.new_category
end
end
class Contributor < RSS::Element
include CommonModel
include PersonConstruct
end
class Generator < RSS::Element
include CommonModel
include ContentModel
[
["uri", "", false, [nil, :uri]],
["version", ""],
].each do |name, uri, required, type|
install_get_attribute(name, uri, required, type)
end
private
def setup_maker_attributes(target)
target.generator do |generator|
generator.uri = uri if uri
generator.version = version if version
end
end
end
# Atom Icon element
#
# Image that provides a visual identification for the Feed. Image should have an aspect
# ratio of 1:1
class Icon < RSS::Element
include CommonModel
include URIContentModel
end
# Atom ID element
#
# Universally Unique Identifier (UUID) for the Feed
class Id < RSS::Element
include CommonModel
include URIContentModel
end
# Defines an Atom Link element
#
# A Link has the following attributes:
# * href
# * rel
# * type
# * hreflang
# * title
# * length
class Link < RSS::Element
include CommonModel
[
["href", "", true, [nil, :uri]],
["rel", ""],
["type", ""],
["hreflang", ""],
["title", ""],
["length", ""],
].each do |name, uri, required, type|
install_get_attribute(name, uri, required, type)
end
private
def maker_target(target)
target.new_link
end
end
# Atom Logo element
#
# Image that provides a visual identification for the Feed. Image should have an aspect
# ratio of 2:1 (horizontal:vertical)
class Logo < RSS::Element
include CommonModel
include URIContentModel
def maker_target(target)
target.maker.image
end
private
def setup_maker_element_writer
"url="
end
end
# Atom Rights element
#
# TextConstruct that contains copyright information regarding the content in an Entry or Feed
class Rights < RSS::Element
include CommonModel
include TextConstruct
end
# Atom Subtitle element
#
# TextConstruct that conveys a description or subtitle for a Feed
class Subtitle < RSS::Element
include CommonModel
include TextConstruct
end
# Atom Title element
#
# TextConstruct that conveys a description or title for a feed or Entry
class Title < RSS::Element
include CommonModel
include TextConstruct
end
# Atom Updated element
#
# DateConstruct indicating the most recent time when an Entry or Feed was modified
# in a way the publisher considers significant
class Updated < RSS::Element
include CommonModel
include DateConstruct
end
# Defines a child Atom Entry element for an Atom Feed
class Entry < RSS::Element
include CommonModel
include DuplicateLinkChecker
[
["author", "*", :children],
["category", "*", :children, "categories"],
["content", "?", :child],
["contributor", "*", :children],
["id", nil, nil, :content],
["link", "*", :children],
["published", "?", :child, :content],
["rights", "?", :child],
["source", "?"],
["summary", "?", :child],
["title", nil],
["updated", nil, :child, :content],
].each do |tag, occurs, type, *args|
type ||= :attribute
__send__("install_have_#{type}_element",
tag, URI, occurs, tag, *args)
end
# Returns whether any of the following are true
# * There are any authors in the feed
# * If the parent element has an author and the +check_parent+ parameter was given.
# * There is a source element that has an author
def have_author?(check_parent=true)
authors.any? {|author| !author.to_s.empty?} or
(check_parent and @parent and @parent.have_author?) or
(source and source.have_author?)
end
private
def atom_validate(ignore_unknown_element, tags, uri)
unless have_author?
raise MissingTagError.new("author", tag_name)
end
validate_duplicate_links(links)
end
def have_required_elements?
super and have_author?
end
def maker_target(items)
if items.respond_to?("items")
# For backward compatibility
items = items.items
end
items.new_item
end
Author = Feed::Author
Category = Feed::Category
class Content < RSS::Element
include CommonModel
class << self
def xml_setter
"xml="
end
def xml_getter
"xml"
end
end
[
["type", ""],
["src", "", false, [nil, :uri]],
].each do |name, uri, required, type|
install_get_attribute(name, uri, required, type)
end
content_setup
add_need_initialize_variable("xml")
attr_writer :xml
def have_xml_content?
inline_xhtml? or inline_other_xml?
end
def xml
return @xml unless inline_xhtml?
return @xml if @xml.nil?
if @xml.is_a?(XML::Element) and
[@xml.name, @xml.uri] == ["div", XHTML_URI]
return @xml
end
children = @xml
children = [children] unless children.is_a?(Array)
XML::Element.new("div", nil, XHTML_URI,
{"xmlns" => XHTML_URI}, children)
end
def xhtml
if inline_xhtml?
xml
else
nil
end
end
def atom_validate(ignore_unknown_element, tags, uri)
if out_of_line?
raise MissingAttributeError.new(tag_name, "type") if @type.nil?
unless (content.nil? or content.empty?)
raise NotAvailableValueError.new(tag_name, content)
end
elsif inline_xhtml?
if @xml.nil?
raise MissingTagError.new("div", tag_name)
end
unless @xml.name == "div" and @xml.uri == XHTML_URI
raise NotExpectedTagError.new(@xml.name, @xml.uri, tag_name)
end
end
end
def inline_text?
!out_of_line? and [nil, "text", "html"].include?(@type)
end
def inline_html?
return false if out_of_line?
@type == "html" or mime_split == ["text", "html"]
end
def inline_xhtml?
!out_of_line? and @type == "xhtml"
end
def inline_other?
return false if out_of_line?
media_type, subtype = mime_split
return false if media_type.nil? or subtype.nil?
true
end
def inline_other_text?
return false unless inline_other?
return false if inline_other_xml?
media_type, = mime_split
return true if "text" == media_type.downcase
false
end
def inline_other_xml?
return false unless inline_other?
media_type, subtype = mime_split
normalized_mime_type = "#{media_type}/#{subtype}".downcase
if /(?:\+xml|^xml)$/ =~ subtype or
%w(text/xml-external-parsed-entity
application/xml-external-parsed-entity
application/xml-dtd).find {|x| x == normalized_mime_type}
return true
end
false
end
def inline_other_base64?
inline_other? and !inline_other_text? and !inline_other_xml?
end
def out_of_line?
not @src.nil?
end
def mime_split
media_type = subtype = nil
if /\A\s*([a-z]+)\/([a-z\+]+)\s*(?:;.*)?\z/i =~ @type.to_s
media_type = $1.downcase
subtype = $2.downcase
end
[media_type, subtype]
end
def need_base64_encode?
inline_other_base64?
end
private
def empty_content?
out_of_line? or super
end
end
Contributor = Feed::Contributor
Id = Feed::Id
Link = Feed::Link
class Published < RSS::Element
include CommonModel
include DateConstruct
end
Rights = Feed::Rights
class Source < RSS::Element
include CommonModel
[
["author", "*", :children],
["category", "*", :children, "categories"],
["contributor", "*", :children],
["generator", "?"],
["icon", "?"],
["id", "?", nil, :content],
["link", "*", :children],
["logo", "?"],
["rights", "?"],
["subtitle", "?"],
["title", "?"],
["updated", "?", nil, :content],
].each do |tag, occurs, type, *args|
type ||= :attribute
__send__("install_have_#{type}_element",
tag, URI, occurs, tag, *args)
end
def have_author?
!author.to_s.empty?
end
Author = Feed::Author
Category = Feed::Category
Contributor = Feed::Contributor
Generator = Feed::Generator
Icon = Feed::Icon
Id = Feed::Id
Link = Feed::Link
Logo = Feed::Logo
Rights = Feed::Rights
Subtitle = Feed::Subtitle
Title = Feed::Title
Updated = Feed::Updated
end
class Summary < RSS::Element
include CommonModel
include TextConstruct
end
Title = Feed::Title
Updated = Feed::Updated
end
end
# Defines a top-level Atom Entry element
#
class Entry < RSS::Element
include RootElementMixin
include CommonModel
include DuplicateLinkChecker
[
["author", "*", :children],
["category", "*", :children, "categories"],
["content", "?"],
["contributor", "*", :children],
["id", nil, nil, :content],
["link", "*", :children],
["published", "?", :child, :content],
["rights", "?"],
["source", "?"],
["summary", "?"],
["title", nil],
["updated", nil, nil, :content],
].each do |tag, occurs, type, *args|
type ||= :attribute
__send__("install_have_#{type}_element",
tag, URI, occurs, tag, *args)
end
# Creates a new Atom Entry element
def initialize(version=nil, encoding=nil, standalone=nil)
super("1.0", version, encoding, standalone)
@feed_type = "atom"
@feed_subtype = "entry"
end
# Returns the Entry in an array
def items
[self]
end
# sets up the +maker+ for constructing Entry elements
def setup_maker(maker)
maker = maker.maker if maker.respond_to?("maker")
super(maker)
end
# Returns where there are any authors present or there is a source with an author
def have_author?
authors.any? {|author| !author.to_s.empty?} or
(source and source.have_author?)
end
private
def atom_validate(ignore_unknown_element, tags, uri)
unless have_author?
raise MissingTagError.new("author", tag_name)
end
validate_duplicate_links(links)
end
def have_required_elements?
super and have_author?
end
def maker_target(maker)
maker.items.new_item
end
Author = Feed::Entry::Author
Category = Feed::Entry::Category
Content = Feed::Entry::Content
Contributor = Feed::Entry::Contributor
Id = Feed::Entry::Id
Link = Feed::Entry::Link
Published = Feed::Entry::Published
Rights = Feed::Entry::Rights
Source = Feed::Entry::Source
Summary = Feed::Entry::Summary
Title = Feed::Entry::Title
Updated = Feed::Entry::Updated
end
end
Atom::CommonModel::ELEMENTS.each do |name|
BaseListener.install_get_text_element(Atom::URI, name, "#{name}=")
end
module ListenerMixin
private
def initial_start_feed(tag_name, prefix, attrs, ns)
check_ns(tag_name, prefix, ns, Atom::URI, false)
@rss = Atom::Feed.new(@version, @encoding, @standalone)
@rss.do_validate = @do_validate
@rss.xml_stylesheets = @xml_stylesheets
@rss.lang = attrs["xml:lang"]
@rss.base = attrs["xml:base"]
@last_element = @rss
pr = Proc.new do |text, tags|
@rss.validate_for_stream(tags) if @do_validate
end
@proc_stack.push(pr)
end
def initial_start_entry(tag_name, prefix, attrs, ns)
check_ns(tag_name, prefix, ns, Atom::URI, false)
@rss = Atom::Entry.new(@version, @encoding, @standalone)
@rss.do_validate = @do_validate
@rss.xml_stylesheets = @xml_stylesheets
@rss.lang = attrs["xml:lang"]
@rss.base = attrs["xml:base"]
@last_element = @rss
pr = Proc.new do |text, tags|
@rss.validate_for_stream(tags) if @do_validate
end
@proc_stack.push(pr)
end
end
end