Class: RDF::Util::File::NetHttpAdapter

Inherits:
HttpAdapter show all
Defined in:
lib/rdf/util/file.rb

Overview

Net::HTTP adapter to retrieve resources without additional dependencies

Since:

  • 1.2

Class Method Summary collapse

Methods inherited from HttpAdapter

default_accept_header, default_user_agent, headers

Class Method Details

.open_url(base_uri, proxy: nil, headers: {}, verify_none: false, **options) ⇒ RemoteDocument, Object

This method is abstract.

Returns A RemoteDocument. If a block is given, the result of evaluating the block is returned.

Parameters:

  • base_uri (String) —

    to open

  • proxy (String) (defaults to: nil) —

    HTTP Proxy to use for requests.

  • headers (Array, String) (defaults to: {}) —

    ({}) HTTP Request headers

    Defaults ‘Accept` header based on available reader content types to allow for content negotiation based on available readers.

    Defaults ‘User-Agent` header, unless one is specified.

  • verify_none (Boolean) (defaults to: false) —

    (false) Don’t verify SSL certificates

  • options (Hash{Symbol => Object}) —

    options are ignored in this implementation. Applications are encouraged to override this implementation to provide more control over HTTP headers and redirect following.

Returns:

Raises:

  • (IOError) —

    if not found

Since:

  • 1.2



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# File 'lib/rdf/util/file.rb', line 119

def self.open_url(base_uri, proxy: nil, headers: {}, verify_none: false, **options)
  ssl_verify = verify_none ? OpenSSL::SSL::VERIFY_NONE : OpenSSL::SSL::VERIFY_PEER

  redirect_count = 0
  max_redirects = 5
  parsed_url = RDF::URI.parse(base_uri)
  parsed_proxy = RDF::URI.parse(proxy.to_s)
  base_uri = parsed_url.to_s
  remote_document = nil

  until remote_document do
    Net::HTTP::start(parsed_url.host, parsed_url.port,
                    parsed_proxy.host, parsed_proxy.port,
                    open_timeout: 60 * 1000,
                    use_ssl: parsed_url.scheme == 'https',
                    verify_mode: ssl_verify
    ) do |http|
      request = Net::HTTP::Get.new(parsed_url.request_uri, headers(headers: headers))
      http.request(request) do |response|
        case response
        when Net::HTTPSuccess
          # found object

          # Normalize headers using symbols
          response_headers = response.to_hash.inject({}) do |out, (key, value)|
            out[key.gsub(/-/, '_').downcase.to_sym] = %w{ set-cookie }.include?(key.downcase) ? value : value.first
            out
          end

          # If a Location is returned, it defines the base resource for this file, not it's actual ending location
          document_options = {
            base_uri:     RDF::URI(response["Location"] ? response["Location"] : base_uri),
            code:         response.code.to_i,
            content_type: response.content_type,
            headers:      response_headers
          }.merge(response.type_params)
          document_options[:last_modified] = DateTime.parse(response["Last-Modified"]) if response["Last-Modified"]

          remote_document = RemoteDocument.new(response.body, document_options)
        when Net::HTTPRedirection
          # Follow redirection
          raise IOError, "Too many redirects" if (redirect_count += 1) > max_redirects

          # Location may be relative
          parsed_url = ::URI.join(base_uri, response["Location"])

          base_uri = parsed_url.to_s
        else
          raise IOError, "<#{parsed_url}>: #{response.message}(#{response.code})"
        end
      end
    end
  end
  remote_document
end