Class: RDF::Util::File::RemoteDocument

Inherits:
StringIO
  • Object
show all
Defined in:
lib/rdf/util/file.rb

Overview

A RemoteDocument contains the body and headers of a remote resource.

Link headers are parsed using the ‘LinkHeader` gem

See Also:

Since:

  • 0.2.4

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(body, options = {}) ⇒ RemoteDocument

Set content

Parameters:

  • body (String) —

    entity content of request.

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 392

def initialize(body, options = {})
  options.each do |key, value|
    # de-quote charset
    matchdata = value.match(/^["'](.*)["']$/.freeze) if key == "charset"
    value = matchdata[1] if matchdata
    value = value.downcase if value.is_a?(String)
    instance_variable_set(:"@#{key}", value)
  end
  @headers = options.fetch(:headers, {})
  @charset = options[:charset].to_s.downcase if options[:charset]
  @parameters = {}

  # Find Content-Type and extract other parameters
  if headers[:content_type]
    ct, *params = headers[:content_type].split(';').map(&:strip)
    @content_type ||= ct

    # Find charset
    params.each do |param|
      p, v = param.split('=')
      @parameters[p.downcase.to_sym] = v.sub(/^["']?([^"']*)["']?$/, '\1')
      @charset ||= @parameters[p.downcase.to_sym].downcase if p.downcase == 'charset'
    end
  end

  @etag = headers[:etag]
  @last_modified = DateTime.parse(headers[:last_modified]) if headers[:last_modified]
  encoding = @charset ||= "utf-8"

  unless encoding.start_with?("utf")
    body.force_encoding(Encoding::UTF_8)
    encoding = "utf-8"

    # Make sure Unicode is in NFC
    begin
      body.unicode_normalize! unless !body.unicode_normalized?
    rescue Encoding::CompatibilityError
      # Oh, well ...
    end if body.respond_to?(:unicode_normalized?)
  end

  super(body).set_encoding encoding
end

Instance Attribute Details

#base_uri ⇒ String (readonly)

Base URI based on resource location or returned Location header.

Returns:

  • (String)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 354

def base_uri
  @base_uri
end

#charset ⇒ String (readonly)

Encoding of resource (from Content-Type), downcased. Also applied to content if it is UTF

Returns:

  • (String)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 362

def charset
  @charset
end

#code ⇒ Integer (readonly)

Response code

Returns:

  • (Integer)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 370

def code
  @code
end

#content_type ⇒ String (readonly)

Content-Type of the returned resource

Returns:

  • (String)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 358

def content_type
  @content_type
end

#etag ⇒ String (readonly)

ETag from headers

Returns:

  • (String)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 375

def etag
  @etag
end

#headers ⇒ Hash{Symbol => Object} (readonly)

Raw headers from response

Returns:

  • (Hash{Symbol => Object})

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 383

def headers
  @headers
end

#last_modified ⇒ DateTime (readonly)

Last-Modified time from headers

Returns:

  • (DateTime)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 379

def last_modified
  @last_modified
end

#parameters ⇒ Symbol => String (readonly)

Parameters from Content-Type

Returns:

  • (Symbol => String) —

    ]

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 366

def parameters
  @parameters
end

#requested_url ⇒ String (readonly)

Originally requested URL

Returns:

  • (String)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 387

def requested_url
  @requested_url
end

Instance Method Details

#content_encoding ⇒ Array<String>

Returns a list of encodings in Content-Encoding field as an array of strings.

The encodings are downcased for canonicalization.

Returns:

  • (Array<String>)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 441

def content_encoding
  headers.fetch(:content_encoding, "").split(',').map(&:strip).map(&:downcase)
end

#links ⇒ ::LinkHeader

Return links from the Link header.

Links can be returned in array form, or searched.

Examples:


d = RemoteDocument.new(...)
describedby = links.find_link(['rel', 'describedby']).href

Returns:

  • (::LinkHeader)

Since:

  • 0.2.4



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# File 'lib/rdf/util/file.rb', line 456

def links
  @links ||= LinkHeader.parse(@headers[:link])
end