Module: ImageSize::URIReader

Extended by:
HTTPChunkyReader
Defined in:
lib/image_size/uri_reader.rb

Overview

:nodoc:

Defined Under Namespace

Modules: HTTPChunkyReader Classes: BodyReader, RangeReader

Class Method Summary collapse

Methods included from HTTPChunkyReader

chunk_range_header, chunk_start

Methods included from ChunkyReader

#[], #chunk_size

Methods included from Reader

#fetch, open_with_uri, #stream, #unpack, #unpack1

Class Method Details

.open(uri) ⇒ Object 



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# File 'lib/image_size/uri_reader.rb', line 92

def open(uri)
  http = nil
  (ImageSize.max_redirects + 1).times do
    ImageSize.uri_checker.call(uri)

    unless http && http.address == uri.host && http.port == uri.port
      http.finish if http

      http = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl = true if uri.scheme == 'https'
      http.start
    end

    response = http.request_get(uri.request_uri, chunk_range_header(0)) do |response_with_unread_body|
      case response_with_unread_body
      when Net::HTTPOK
        return yield BodyReader.new(response_with_unread_body)
      end
    end

    case response
    when Net::HTTPRedirection
      uri += response['location']
    when Net::HTTPPartialContent
      m = response['content-range'].match(%r{\bbytes\s+\d+-\d+/(\d+)}i) if response['content-range']
      byte_size = m[1].to_i if m
      return yield RangeReader.new(http, uri.request_uri, response.body, byte_size)
    when Net::HTTPRequestedRangeNotSatisfiable
      return yield StringReader.new('')
    else
      fail "Unexpected response: #{response}"
    end
  end

  fail "Too many redirects: #{uri}"
ensure
  http.finish if http && http.started?
end