Class: Mechanize::HTTP::Agent

Inherits:
Object
  • Object
show all
Defined in:
lib/mechanize/http/agent.rb

Overview

An HTTP (and local disk access) user agent. This class is an implementation detail and is subject to change at any time.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Agent

Creates a new Mechanize HTTP user agent. The user agent is an implementation detail of mechanize and its API may change at any time.



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# File 'lib/mechanize/http/agent.rb', line 117

def initialize
  @conditional_requests     = true
  @context                  = nil
  @content_encoding_hooks   = []
  @cookie_jar               = Mechanize::CookieJar.new
  @follow_meta_refresh      = false
  @follow_meta_refresh_self = false
  @gzip_enabled             = true
  @history                  = Mechanize::History.new
  @keep_alive               = true
  @max_file_buffer          = 100_000 # 5MB for response bodies
  @open_timeout             = nil
  @post_connect_hooks       = []
  @pre_connect_hooks        = []
  @read_timeout             = nil
  @redirect_ok              = true
  @redirection_limit        = 20
  @request_headers          = {}
  @robots                   = false
  @user_agent               = nil
  @webrobots                = nil

  # HTTP Authentication
  @auth_store           = Mechanize::HTTP::AuthStore.new
  @authenticate_parser  = Mechanize::HTTP::WWWAuthenticateParser.new
  @authenticate_methods = Hash.new do |methods, uri|
    methods[uri] = Hash.new do |realms, auth_scheme|
      realms[auth_scheme] = []
    end
  end
  @digest_auth          = Net::HTTP::DigestAuth.new
  @digest_challenges    = {}

  # SSL
  @pass = nil

  @scheme_handlers = Hash.new { |h, scheme|
    h[scheme] = lambda { |link, page|
      raise Mechanize::UnsupportedSchemeError, scheme
    }
  }

  @scheme_handlers['http']      = lambda { |link, page| link }
  @scheme_handlers['https']     = @scheme_handlers['http']
  @scheme_handlers['relative']  = @scheme_handlers['http']
  @scheme_handlers['file']      = @scheme_handlers['http']

  @http = Net::HTTP::Persistent.new 'mechanize'
  @http.idle_timeout = 5
  @http.keep_alive   = 300
end

Instance Attribute Details

#auth_store ⇒ Object (readonly)

:section: HTTP Authentication



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# File 'lib/mechanize/http/agent.rb', line 46

def auth_store
  @auth_store
end

#authenticate_methods ⇒ Object (readonly)

:nodoc:



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# File 'lib/mechanize/http/agent.rb', line 47

def authenticate_methods
  @authenticate_methods
end

#conditional_requests ⇒ Object

Disables If-Modified-Since conditional requests (enabled by default)



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# File 'lib/mechanize/http/agent.rb', line 15

def conditional_requests
  @conditional_requests
end

#content_encoding_hooks ⇒ Object (readonly)

A list of hooks to call to handle the content-encoding of a request.



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# File 'lib/mechanize/http/agent.rb', line 42

def content_encoding_hooks
  @content_encoding_hooks
end

#context ⇒ Object

The context parses responses into pages



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# File 'lib/mechanize/http/agent.rb', line 105

def context
  @context
end

#cookie_jar ⇒ Object

The cookies for this agent



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# File 'lib/mechanize/http/agent.rb', line 96

def cookie_jar
  @cookie_jar
end

#digest_challenges ⇒ Object (readonly)

:nodoc:



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# File 'lib/mechanize/http/agent.rb', line 48

def digest_challenges
  @digest_challenges
end

#follow_meta_refresh ⇒ Object

Follow HTML meta refresh and HTTP Refresh. If set to :anywhere meta refresh tags outside of the head element will be followed.



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# File 'lib/mechanize/http/agent.rb', line 54

def follow_meta_refresh
  @follow_meta_refresh
end

#follow_meta_refresh_self ⇒ Object

Follow an HTML meta refresh that has no “url=” in the content attribute.

Defaults to false to prevent infinite refresh loops.



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# File 'lib/mechanize/http/agent.rb', line 59

def follow_meta_refresh_self
  @follow_meta_refresh_self
end

#gzip_enabled ⇒ Object

Is gzip compression of requests enabled?



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# File 'lib/mechanize/http/agent.rb', line 18

def gzip_enabled
  @gzip_enabled
end

#history ⇒ Object

history of requests made



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# File 'lib/mechanize/http/agent.rb', line 29

def history
  @history
end

#http ⇒ Object (readonly)

:nodoc:



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# File 'lib/mechanize/http/agent.rb', line 107

def http
  @http
end

#keep_alive ⇒ Object

Set to false to disable HTTP/1.1 keep-alive requests



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# File 'lib/mechanize/http/agent.rb', line 85

def keep_alive
  @keep_alive
end

#max_file_buffer ⇒ Object

Responses larger than this will be written to a Tempfile instead of stored in memory. Setting this to nil disables creation of Tempfiles.



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# File 'lib/mechanize/http/agent.rb', line 100

def max_file_buffer
  @max_file_buffer
end

#open_timeout ⇒ Object

Length of time to wait until a connection is opened in seconds



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# File 'lib/mechanize/http/agent.rb', line 88

def open_timeout
  @open_timeout
end

#pass ⇒ Object

OpenSSL key password



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# File 'lib/mechanize/http/agent.rb', line 80

def pass
  @pass
end

#post_connect_hooks ⇒ Object (readonly)

A list of hooks to call after retrieving a response. Hooks are called with the agent and the response returned.



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# File 'lib/mechanize/http/agent.rb', line 35

def post_connect_hooks
  @post_connect_hooks
end

#pre_connect_hooks ⇒ Object (readonly)

A list of hooks to call before making a request. Hooks are called with the agent and the request to be performed.



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# File 'lib/mechanize/http/agent.rb', line 39

def pre_connect_hooks
  @pre_connect_hooks
end

#read_timeout ⇒ Object

Length of time to attempt to read data from the server



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# File 'lib/mechanize/http/agent.rb', line 91

def read_timeout
  @read_timeout
end

#redirect_ok ⇒ Object

Controls how this agent deals with redirects. The following values are allowed:

:all, true

All 3xx redirects are followed (default)

:permanent

Only 301 Moved Permanantly redirects are followed

false

No redirects are followed



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# File 'lib/mechanize/http/agent.rb', line 67

def redirect_ok
  @redirect_ok
end

#redirection_limit ⇒ Object

Maximum number of redirects to follow



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# File 'lib/mechanize/http/agent.rb', line 70

def redirection_limit
  @redirection_limit
end

#request_headers ⇒ Object

A hash of request headers to be used for every request



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# File 'lib/mechanize/http/agent.rb', line 21

def request_headers
  @request_headers
end

#robots ⇒ Object

When true, this agent will consult the site’s robots.txt for each access.



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# File 'lib/mechanize/http/agent.rb', line 75

def robots
  @robots
end

#scheme_handlers ⇒ Object

Handlers for various URI schemes



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# File 'lib/mechanize/http/agent.rb', line 110

def scheme_handlers
  @scheme_handlers
end

#user_agent ⇒ Object

The User-Agent header to send



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# File 'lib/mechanize/http/agent.rb', line 24

def user_agent
  @user_agent
end

Instance Method Details

#add_auth(uri, user, password, realm = nil, domain = nil) ⇒ Object

Adds credentials user, pass for uri. If realm is set the credentials are used only for that realm. If realm is not set the credentials become the default for any realm on that URI.

domain and realm are exclusive as NTLM does not follow RFC 2617. If domain is given it is only used for NTLM authentication.



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# File 'lib/mechanize/http/agent.rb', line 177

def add_auth uri, user, password, realm = nil, domain = nil
  @auth_store.add_auth uri, user, password, realm, domain
end

#add_default_auth(user, password, domain = nil) ⇒ Object

USE OF add_default_auth IS NOT RECOMMENDED AS IT MAY EXPOSE PASSWORDS TO THIRD PARTIES

Adds credentials user, pass as the default authentication credentials. If no other credentials are available these will be returned from credentials_for.

If domain is given it is only used for NTLM authentication.



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# File 'lib/mechanize/http/agent.rb', line 191

def add_default_auth user, password, domain = nil # :nodoc:
  @auth_store.add_default_auth user, password, domain
end

#auto_io(name, read_size, input_io) ⇒ Object

Creates a new output IO by reading input_io in read_size chunks. If the output is over the max_file_buffer size a Tempfile with name is created.

If a block is provided, each chunk of input_io is yielded for further processing.



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# File 'lib/mechanize/http/agent.rb', line 1085

def auto_io name, read_size, input_io
  out_io = StringIO.new

  out_io.set_encoding Encoding::BINARY if out_io.respond_to? :set_encoding

  until input_io.eof? do
    if StringIO === out_io and use_tempfile? out_io.size then
      new_io = Tempfile.new name
      new_io.unlink
      new_io.binmode

      new_io.write out_io.string
      out_io = new_io
    end

    chunk = input_io.read read_size
    chunk = yield chunk if block_given?

    out_io.write chunk
  end

  out_io.rewind

  out_io
end

#back ⇒ Object

Equivalent to the browser back button. Returns the most recent page visited.



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# File 'lib/mechanize/http/agent.rb', line 323

def back
  @history.pop
end

#ca_file ⇒ Object

Path to an OpenSSL CA certificate file



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# File 'lib/mechanize/http/agent.rb', line 976

def ca_file
  @http.ca_file
end

#ca_file=(ca_file) ⇒ Object

Sets the path to an OpenSSL CA certificate file



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# File 'lib/mechanize/http/agent.rb', line 981

def ca_file= ca_file
  @http.ca_file = ca_file
end

#cert_store ⇒ Object

The SSL certificate store used for validating connections



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# File 'lib/mechanize/http/agent.rb', line 986

def cert_store
  @http.cert_store
end

#cert_store=(cert_store) ⇒ Object

Sets the SSL certificate store used for validating connections



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# File 'lib/mechanize/http/agent.rb', line 991

def cert_store= cert_store
  @http.cert_store = cert_store
end

#certificate ⇒ Object

The client X509 certificate



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# File 'lib/mechanize/http/agent.rb', line 996

def certificate
  @http.certificate
end

#certificate=(certificate) ⇒ Object

Sets the client certificate to given X509 certificate. If a path is given the certificate will be loaded and set.



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# File 'lib/mechanize/http/agent.rb', line 1002

def certificate= certificate
  certificate = if OpenSSL::X509::Certificate === certificate then
                  certificate
                else
                  OpenSSL::X509::Certificate.new File.read certificate
                end

  @http.certificate = certificate
end

#connection_for(uri) ⇒ Object

:section: Request



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# File 'lib/mechanize/http/agent.rb', line 384

def connection_for uri
  case uri.scheme.downcase
  when 'http', 'https' then
    return @http
  when 'file' then
    return Mechanize::FileConnection.new
  end
end

#content_encoding_gunzip(body_io) ⇒ Object

Decodes a gzip-encoded body_io. If it cannot be decoded, inflate is tried followed by raising an error.



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# File 'lib/mechanize/http/agent.rb', line 397

def content_encoding_gunzip body_io
  log.debug('gzip response') if log

  zio = Zlib::GzipReader.new body_io
  out_io = auto_io 'mechanize-gunzip', 16384, zio
  zio.finish

  return out_io
rescue Zlib::Error
  log.error('unable to gunzip response, trying raw inflate') if log

  body_io.rewind
  body_io.read 10

  begin
    return inflate body_io, -Zlib::MAX_WBITS
  rescue Zlib::Error => e
    log.error("unable to gunzip response: #{e}") if log
    raise
  end
ensure
  zio.close if zio and not zio.closed?
  body_io.close unless body_io.closed?
end

#content_encoding_inflate(body_io) ⇒ Object

Decodes a deflate-encoded body_io. If it cannot be decoded, raw inflate is tried followed by raising an error.



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# File 'lib/mechanize/http/agent.rb', line 426

def content_encoding_inflate body_io
  log.debug('deflate body') if log

  return inflate body_io
rescue Zlib::Error
  log.error('unable to inflate response, trying raw deflate') if log

  body_io.rewind

  begin
    return inflate body_io, -Zlib::MAX_WBITS
  rescue Zlib::Error => e
    log.error("unable to inflate response: #{e}") if log
    raise
  end
ensure
  body_io.close
end

#current_page ⇒ Object

Returns the latest page loaded by the agent



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# File 'lib/mechanize/http/agent.rb', line 330

def current_page
  @history.last
end

#disable_keep_alive(request) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 445

def disable_keep_alive request
  request['connection'] = 'close' unless @keep_alive
end

#enable_gzip(request) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 449

def enable_gzip request
  request['accept-encoding'] = if @gzip_enabled
                                 'gzip,deflate,identity'
                               else
                                 'identity'
                               end
end

#fetch(uri, method = :get, headers = {}, params = [], referer = current_page, redirects = 0) ⇒ Object

Retrieves uri and parses it into a page or other object according to PluggableParser. If the URI is an HTTP or HTTPS scheme URI the given HTTP method is used to retrieve it, along with the HTTP headers, request params and HTTP referer.

redirects tracks the number of redirects experienced when retrieving the page. If it is over the redirection_limit an error will be raised.



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# File 'lib/mechanize/http/agent.rb', line 204

def fetch uri, method = :get, headers = {}, params = [],
          referer = current_page, redirects = 0
  referer_uri = referer ? referer.uri : nil

  uri = resolve uri, referer

  uri, params = resolve_parameters uri, method, params

  request = http_request uri, method, params

  connection = connection_for uri

  request_auth             request, uri

  disable_keep_alive       request
  enable_gzip              request

  request_language_charset request
  request_cookies          request, uri
  request_host             request, uri
  request_referer          request, uri, referer_uri
  request_user_agent       request
  request_add_headers      request, headers

  pre_connect              request

  # Consult robots.txt
  if robots && uri.is_a?(URI::HTTP)
    robots_allowed?(uri) or raise Mechanize::RobotsDisallowedError.new(uri)
  end

  # Add If-Modified-Since if page is in history
  page = visited_page(uri)

  if (page = visited_page(uri)) and page.response['Last-Modified']
    request['If-Modified-Since'] = page.response['Last-Modified']
  end if(@conditional_requests)

  # Specify timeouts if given
  connection.open_timeout = @open_timeout if @open_timeout
  connection.read_timeout = @read_timeout if @read_timeout

  request_log request

  response_body_io = nil

  # Send the request
  response = connection.request(uri, request) { |res|
    response_log res

    response_body_io = response_read res, request, uri

    res
  }

  hook_content_encoding response, uri, response_body_io

  response_body_io = response_content_encoding response, response_body_io if
    request.response_body_permitted?

  post_connect uri, response, response_body_io

  page = response_parse response, response_body_io, uri

  response_cookies response, uri, page

  meta = response_follow_meta_refresh response, uri, page, redirects
  return meta if meta

  case response
  when Net::HTTPSuccess
    if robots && page.is_a?(Mechanize::Page)
      page.parser.noindex? and raise Mechanize::RobotsDisallowedError.new(uri)
    end

    page
  when Mechanize::FileResponse
    page
  when Net::HTTPNotModified
    log.debug("Got cached page") if log
    visited_page(uri) || page
  when Net::HTTPRedirection
    response_redirect response, method, page, redirects, referer
  when Net::HTTPUnauthorized
    response_authenticate(response, page, uri, request, headers, params,
                          referer)
  else
    raise Mechanize::ResponseCodeError.new(page, 'unhandled response')
  end
end

#get_meta_refresh(response, uri, page) ⇒ Object

:section: Response



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# File 'lib/mechanize/http/agent.rb', line 654

def get_meta_refresh response, uri, page
  return nil unless @follow_meta_refresh

  if page.respond_to?(:meta_refresh) and
     (redirect = page.meta_refresh.first) then
    [redirect.delay, redirect.href] unless
      not @follow_meta_refresh_self and redirect.link_self
  elsif refresh = response['refresh']
    delay, href, link_self = Mechanize::Page::MetaRefresh.parse refresh, uri
    raise Mechanize::Error, 'Invalid refresh http header' unless delay
    [delay.to_f, href] unless
      not @follow_meta_refresh_self and link_self
  end
end

#get_robots(uri) ⇒ Object

:section: Robots



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# File 'lib/mechanize/http/agent.rb', line 923

def get_robots(uri) # :nodoc:
  fetch(uri).body
rescue Mechanize::ResponseCodeError => e
  return '' if e.response_code == '404'
  raise e
end

#hook_content_encoding(response, uri, response_body_io) ⇒ Object

:section: Hooks



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# File 'lib/mechanize/http/agent.rb', line 349

def hook_content_encoding response, uri, response_body_io
  @content_encoding_hooks.each do |hook|
    hook.call self, uri, response, response_body_io
  end
end

#http_request(uri, method, params = nil) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 457

def http_request uri, method, params = nil
  case uri.scheme.downcase
  when 'http', 'https' then
    klass = Net::HTTP.const_get(method.to_s.capitalize)

    request ||= klass.new(uri.request_uri)
    request.body = params.first if params

    request
  when 'file' then
    Mechanize::FileRequest.new uri
  end
end

#idle_timeout ⇒ Object

Reset connections that have not been used in this many seconds



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# File 'lib/mechanize/http/agent.rb', line 1066

def idle_timeout
  @http.idle_timeout
end

#idle_timeout=(timeout) ⇒ Object

Sets the connection idle timeout for persistent connections



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# File 'lib/mechanize/http/agent.rb', line 1071

def idle_timeout= timeout
  @http.idle_timeout = timeout
end

#inflate(compressed, window_bits = nil) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 1111

def inflate compressed, window_bits = nil
  inflate = Zlib::Inflate.new window_bits

  out_io = auto_io 'mechanize-inflate', 1024, compressed do |chunk|
    inflate.inflate chunk
  end

  out_io.write inflate.finish

  out_io
ensure
  inflate.close
end

#log ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 1125

def log
  @context.log
end

#max_history ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 334

def max_history
  @history.max_size
end

#max_history=(length) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 338

def max_history=(length)
  @history.max_size = length
end

#post_connect(uri, response, body_io) ⇒ Object

Invokes hooks added to post_connect_hooks after a response is returned and the response body is handled.

Yields the context, the uri for the request, the response and the response body.



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# File 'lib/mechanize/http/agent.rb', line 362

def post_connect uri, response, body_io # :yields: agent, uri, response, body
  @post_connect_hooks.each do |hook|
    begin
      hook.call self, uri, response, body_io.read
    ensure
      body_io.rewind
    end
  end
end

#pre_connect(request) ⇒ Object

Invokes hooks added to pre_connect_hooks before a request is made. Yields the agent and the request that will be performed to each hook.



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# File 'lib/mechanize/http/agent.rb', line 376

def pre_connect request # :yields: agent, request
  @pre_connect_hooks.each do |hook|
    hook.call self, request
  end
end

#private_key ⇒ Object

An OpenSSL private key or the path to a private key



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# File 'lib/mechanize/http/agent.rb', line 1013

def private_key
  @http.private_key
end

#private_key=(private_key) ⇒ Object

Sets the client’s private key



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# File 'lib/mechanize/http/agent.rb', line 1018

def private_key= private_key
  private_key = if OpenSSL::PKey::PKey === private_key then
                  private_key
                else
                  OpenSSL::PKey::RSA.new File.read(private_key), @pass
                end

  @http.private_key = private_key
end

#proxy_uri ⇒ Object

URI for a proxy connection



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# File 'lib/mechanize/http/agent.rb', line 297

def proxy_uri
  @http.proxy_uri
end

#request_add_headers(request, headers = {}) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 471

def request_add_headers request, headers = {}
  @request_headers.each do |k,v|
    request[k] = v
  end

  headers.each do |field, value|
    case field
    when :etag              then request["ETag"] = value
    when :if_modified_since then request["If-Modified-Since"] = value
    when Symbol then
      raise ArgumentError, "unknown header symbol #{field}"
    else
      request[field] = value
    end
  end
end

#request_auth(request, uri) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 488

def request_auth request, uri
  base_uri = uri + '/'
  schemes = @authenticate_methods[base_uri]

  if realm = schemes[:digest].find { |r| r.uri == base_uri } then
    request_auth_digest request, uri, realm, base_uri, false
  elsif realm = schemes[:iis_digest].find { |r| r.uri == base_uri } then
    request_auth_digest request, uri, realm, base_uri, true
  elsif realm = schemes[:basic].find { |r| r.uri == base_uri } then
    user, password, = @auth_store.credentials_for uri, realm.realm
    request.basic_auth user, password
  end
end

#request_auth_digest(request, uri, realm, base_uri, iis) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 502

def request_auth_digest request, uri, realm, base_uri, iis
  challenge = @digest_challenges[realm]

  user, password, = @auth_store.credentials_for uri, realm.realm
  uri.user     = user
  uri.password = password

  auth = @digest_auth.auth_header uri, challenge.to_s, request.method, iis
  request['Authorization'] = auth
end

#request_cookies(request, uri) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 513

def request_cookies request, uri
  return if @cookie_jar.empty? uri

  cookies = @cookie_jar.cookies uri

  return if cookies.empty?

  request.add_field 'Cookie', cookies.join('; ')
end

#request_host(request, uri) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 523

def request_host request, uri
  port = [80, 443].include?(uri.port.to_i) ? nil : uri.port
  host = uri.host

  request['Host'] = [host, port].compact.join ':'
end

#request_language_charset(request) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 530

def request_language_charset request
  request['accept-charset']  = 'ISO-8859-1,utf-8;q=0.7,*;q=0.7'
  request['accept-language'] = 'en-us,en;q=0.5'
end

#request_log(request) ⇒ Object

Log specified headers for the request



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# File 'lib/mechanize/http/agent.rb', line 536

def request_log request
  return unless log

  log.info("#{request.class}: #{request.path}")

  request.each_header do |k, v|
    log.debug("request-header: #{k} => #{v}")
  end
end

#request_referer(request, uri, referer) ⇒ Object

Sets a Referer header. Fragment part is removed as demanded by RFC 2616 14.36, and user information part is removed just like major browsers do.



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# File 'lib/mechanize/http/agent.rb', line 549

def request_referer request, uri, referer
  return unless referer
  return if 'https'.casecmp(referer.scheme) == 0 and
            'https'.casecmp(uri.scheme) != 0
  if referer.fragment || referer.user || referer.password
    referer = referer.dup
    referer.fragment = referer.user = referer.password = nil
  end
  request['Referer'] = referer
end

#request_user_agent(request) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 560

def request_user_agent request
  request['User-Agent'] = @user_agent if @user_agent
end

#resolve(uri, referer = current_page) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 564

def resolve(uri, referer = current_page)
  referer_uri = referer && referer.uri
  if uri.is_a?(URI)
    uri = uri.dup
  elsif uri.nil?
    if referer_uri
      return referer_uri
    end
    raise ArgumentError, "absolute URL needed (not nil)"
  else
    url = uri.to_s.strip
    if url.empty?
      if referer_uri
        return referer_uri.dup.tap { |u| u.fragment = nil }
      end
      raise ArgumentError, "absolute URL needed (not #{uri.inspect})"
    end

    url.gsub!(/[^#{0.chr}-#{126.chr}]/o) { |match|
      if RUBY_VERSION >= "1.9.0"
        Mechanize::Util.uri_escape(match)
      else
        sprintf('%%%X', match.unpack($KCODE == 'UTF8' ? 'U' : 'C')[0])
      end
    }

    escaped_url = Mechanize::Util.html_unescape(
      url.split(/((?:%[0-9A-Fa-f]{2})+|#)/).each_slice(2).map { |x, y|
        "#{WEBrick::HTTPUtils.escape(x)}#{y}"
      }.join('')
    )

    begin
      uri = URI.parse(escaped_url)
    rescue
      uri = URI.parse(WEBrick::HTTPUtils.escape(escaped_url))
    end
  end

  scheme = uri.relative? ? 'relative' : uri.scheme.downcase
  uri = @scheme_handlers[scheme].call(uri, referer)

  if referer_uri
    if uri.path.length == 0 && uri.relative?
      uri.path = referer_uri.path
    end
  end

  uri.path = '/' if uri.path.length == 0

  if uri.relative?
    raise ArgumentError, "absolute URL needed (not #{uri})" unless
      referer_uri

    if referer.respond_to?(:bases) && referer.parser &&
        (lbase = referer.bases.last) && lbase.uri && lbase.uri.absolute?
      base = lbase
    else
      base = nil
    end

    uri = referer_uri + (base ? base.uri : referer_uri) + uri
    # Strip initial "/.." bits from the path
    uri.path.sub!(/^(\/\.\.)+(?=\/)/, '')
  end

  unless ['http', 'https', 'file'].include?(uri.scheme.downcase)
    raise ArgumentError, "unsupported scheme: #{uri.scheme}"
  end

  uri
end

#resolve_parameters(uri, method, parameters) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 637

def resolve_parameters uri, method, parameters
  case method
  when :head, :get, :delete, :trace then
    if parameters and parameters.length > 0
      uri.query ||= ''
      uri.query << '&' if uri.query.length > 0
      uri.query << Mechanize::Util.build_query_string(parameters)
    end

    return uri, nil
  end

  return uri, parameters
end

#response_authenticate(response, page, uri, request, headers, params, referer) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 669

def response_authenticate(response, page, uri, request, headers, params,
                          referer)
  www_authenticate = response['www-authenticate']

  unless www_authenticate = response['www-authenticate'] then
    message = 'WWW-Authenticate header missing in response'
    raise Mechanize::UnauthorizedError.new(page, nil, message)
  end
                                             
  challenges = @authenticate_parser.parse www_authenticate

  unless @auth_store.credentials? uri, challenges then
    message = "no credentials found, provide some with #add_auth"
    raise Mechanize::UnauthorizedError.new(page, challenges, message)
  end

  if challenge = challenges.find { |c| c.scheme =~ /^Digest$/i } then
    realm = challenge.realm uri

    auth_scheme = if response['server'] =~ /Microsoft-IIS/ then
                    :iis_digest
                  else
                    :digest
                  end

    existing_realms = @authenticate_methods[realm.uri][auth_scheme]

    if existing_realms.include? realm
      message = 'Digest authentication failed'
      raise Mechanize::UnauthorizedError.new(page, challeges, message)
    end

    existing_realms << realm
    @digest_challenges[realm] = challenge
  elsif challenge = challenges.find { |c| c.scheme == 'NTLM' } then
    existing_realms = @authenticate_methods[uri + '/'][:ntlm]

    if existing_realms.include?(realm) and not challenge.params then
      message = 'NTLM authentication failed'
      raise Mechanize::UnauthorizedError.new(page, challenges, message)
    end

    existing_realms << realm

    if challenge.params then
      type_2 = Net::NTLM::Message.decode64 challenge.params

      user, password, domain = @auth_store.credentials_for uri, nil

      type_3 = type_2.response({ :user => user, :password => password,
                                 :domain => domain },
                               { :ntlmv2 => true }).encode64

      headers['Authorization'] = "NTLM #{type_3}"
    else
      type_1 = Net::NTLM::Message::Type1.new.encode64
      headers['Authorization'] = "NTLM #{type_1}"
    end
  elsif challenge = challenges.find { |c| c.scheme == 'Basic' } then
    realm = challenge.realm uri

    existing_realms = @authenticate_methods[realm.uri][:basic]

    if existing_realms.include? realm then
      message = 'Basic authentication failed'
      raise Mechanize::UnauthorizedError.new(page, challenges, message)
    end

    existing_realms << realm
  else
    message = 'unsupported authentication scheme'
    raise Mechanize::UnauthorizedError.new(page, challenges, message)
  end

  fetch uri, request.method.downcase.to_sym, headers, params, referer
end

#response_content_encoding(response, body_io) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 746

def response_content_encoding response, body_io
  length = response.content_length ||
    case body_io
    when Tempfile, IO then
      body_io.stat.size
    else
      body_io.length
    end

  return body_io if length.zero?

  out_io = case response['Content-Encoding']
           when nil, 'none', '7bit' then
             body_io
           when 'deflate' then
             content_encoding_inflate body_io
           when 'gzip', 'x-gzip' then
             content_encoding_gunzip body_io
           else
             raise Mechanize::Error,
               "unsupported content-encoding: #{response['Content-Encoding']}"
           end

  out_io.flush
  out_io.rewind

  out_io
rescue Zlib::Error => e
  message = "error handling content-encoding #{response['Content-Encoding']}:"
  message << " #{e.message} (#{e.class})"
  raise Mechanize::Error, message
ensure
  begin
    if Tempfile === body_io and
       (StringIO === out_io or out_io.path != body_io.path) then
      body_io.close! 
    end
  rescue IOError
    # HACK ruby 1.8 raises IOError when closing the stream
  end
end

#response_cookies(response, uri, page) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 788

def response_cookies response, uri, page
  if Mechanize::Page === page and page.body =~ /Set-Cookie/n
    page.search('//head/meta[@http-equiv="Set-Cookie"]').each do |meta|
      save_cookies(uri, meta['content'])
    end
  end

  header_cookies = response.get_fields 'Set-Cookie'

  return unless header_cookies

  header_cookies.each do |set_cookie|
    save_cookies(uri, set_cookie)
  end
end

#response_follow_meta_refresh(response, uri, page, redirects) ⇒ Object

Raises:



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# File 'lib/mechanize/http/agent.rb', line 815

def response_follow_meta_refresh response, uri, page, redirects
  delay, new_url = get_meta_refresh(response, uri, page)
  return nil unless delay
  new_url = new_url ? resolve(new_url, page) : uri

  raise Mechanize::RedirectLimitReachedError.new(page, redirects) if
    redirects + 1 > @redirection_limit

  sleep delay
  @history.push(page, page.uri)
  fetch new_url, :get, {}, [],
        Mechanize::Page.new, redirects
end

#response_log(response) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 829

def response_log response
  return unless log

  log.info("status: #{response.class} #{response.http_version} " \
           "#{response.code} #{response.message}")

  response.each_header do |k, v|
    log.debug("response-header: #{k} => #{v}")
  end
end

#response_parse(response, body_io, uri) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 840

def response_parse response, body_io, uri
  @context.parse uri, response, body_io
end

#response_read(response, request, uri) ⇒ Object

Raises:



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# File 'lib/mechanize/http/agent.rb', line 844

def response_read response, request, uri
  content_length = response.content_length

  if use_tempfile? content_length then
    body_io = Tempfile.new 'mechanize-raw'
    body_io.unlink
    body_io.binmode if defined? body_io.binmode
  else
    body_io = StringIO.new
  end

  body_io.set_encoding Encoding::BINARY if body_io.respond_to? :set_encoding
  total = 0

  begin
    response.read_body { |part|
      total += part.length

      if StringIO === body_io and use_tempfile? total then
        new_io = Tempfile.new 'mechanize-raw'
        new_io.unlink
        new_io.binmode

        new_io.write body_io.string

        body_io = new_io
      end

      body_io.write(part)
      log.debug("Read #{part.length} bytes (#{total} total)") if log
    }
  rescue Net::HTTP::Persistent::Error => e
    body_io.rewind
    raise Mechanize::ResponseReadError.new(e, response, body_io, uri,
                                           @context)
  end

  body_io.flush
  body_io.rewind

  raise Mechanize::ResponseCodeError.new(response, uri) if
    Net::HTTPUnknownResponse === response

  content_length = response.content_length

  unless Net::HTTP::Head === request or Net::HTTPRedirection === response then
    raise EOFError, "Content-Length (#{content_length}) does not match " \
                    "response body length (#{body_io.length})" if
      content_length and content_length != body_io.length
  end

  body_io
end

#response_redirect(response, method, page, redirects, referer = current_page) ⇒ Object

Raises:



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# File 'lib/mechanize/http/agent.rb', line 898

def response_redirect response, method, page, redirects, referer = current_page
  case @redirect_ok
  when true, :all
    # shortcut
  when false, nil
    return page
  when :permanent
    return page unless Net::HTTPMovedPermanently === response
  end

  log.info("follow redirect to: #{response['Location']}") if log

  raise Mechanize::RedirectLimitReachedError.new(page, redirects) if
    redirects + 1 > @redirection_limit

  redirect_method = method == :head ? :head : :get

  @history.push(page, page.uri)
  new_uri = resolve response['Location'].to_s, page

  fetch new_uri, redirect_method, {}, [], referer, redirects + 1
end

#retry_change_requests ⇒ Object

Retry non-idempotent requests?



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# File 'lib/mechanize/http/agent.rb', line 302

def retry_change_requests
  @http.retry_change_requests
end

#retry_change_requests=(retri) ⇒ Object

Retry non-idempotent requests



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# File 'lib/mechanize/http/agent.rb', line 308

def retry_change_requests= retri
  @http.retry_change_requests = retri
end

#robots_allowed?(uri) ⇒ Boolean

Tests if this agent is allowed to access url, consulting the site’s robots.txt.

Returns:

  • (Boolean) 


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# File 'lib/mechanize/http/agent.rb', line 940

def robots_allowed? uri
  return true if uri.request_uri == '/robots.txt'

  webrobots.allowed? uri
end

#robots_disallowed?(url) ⇒ Boolean

Opposite of robots_allowed?

Returns:

  • (Boolean) 


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# File 'lib/mechanize/http/agent.rb', line 948

def robots_disallowed? url
  !robots_allowed? url
end

#robots_error(url) ⇒ Object

Returns an error object if there is an error in fetching or parsing robots.txt of the site url.



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# File 'lib/mechanize/http/agent.rb', line 954

def robots_error(url)
  webrobots.error(url)
end

#robots_error!(url) ⇒ Object

Raises the error if there is an error in fetching or parsing robots.txt of the site url.



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# File 'lib/mechanize/http/agent.rb', line 960

def robots_error!(url)
  webrobots.error!(url)
end

#robots_reset(url) ⇒ Object

Removes robots.txt cache for the site url.



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# File 'lib/mechanize/http/agent.rb', line 965

def robots_reset(url)
  webrobots.reset(url)
end

#save_cookies(uri, set_cookie) ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 804

def save_cookies(uri, set_cookie)
  log = log()	 # reduce method calls
  Mechanize::Cookie.parse(uri, set_cookie, log) { |c|
    if @cookie_jar.add(uri, c)
      log.debug("saved cookie: #{c}") if log
    else
      log.debug("rejected cookie: #{c}") if log
    end
  }
end

#set_proxy(addr, port, user = nil, pass = nil) ⇒ Object

Sets the proxy address, port, user, and password addr should be a host, with no “http://”, port may be a port number, service name or port number string.



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# File 'lib/mechanize/http/agent.rb', line 1134

def set_proxy addr, port, user = nil, pass = nil
  unless addr and port then
    @http.proxy = nil

    return
  end

  unless Integer === port then
    begin
      port = Socket.getservbyname port
    rescue SocketError
      begin
        port = Integer port
      rescue ArgumentError
        raise ArgumentError, "invalid value for port: #{port.inspect}"
      end
    end
  end

  proxy_uri = URI "http://#{addr}"
  proxy_uri.port = port
  proxy_uri.user     = user if user
  proxy_uri.password = pass if pass

  @http.proxy = proxy_uri
end

#ssl_version ⇒ Object

SSL version to use



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# File 'lib/mechanize/http/agent.rb', line 1029

def ssl_version
  @http.ssl_version
end

#ssl_version=(ssl_version) ⇒ Object

Sets the SSL version to use



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# File 'lib/mechanize/http/agent.rb', line 1034

def ssl_version= ssl_version
  @http.ssl_version = ssl_version
end

#use_tempfile?(size) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mechanize/http/agent.rb', line 1161

def use_tempfile? size
  return false unless @max_file_buffer
  return false unless size

  size >= @max_file_buffer
end

#verify_callback ⇒ Object

A callback for additional certificate verification. See OpenSSL::SSL::SSLContext#verify_callback

The callback can be used for debugging or to ignore errors by always returning true. Specifying nil uses the default method that was valid when the SSLContext was created



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# File 'lib/mechanize/http/agent.rb', line 1044

def verify_callback
  @http.verify_callback
end

#verify_callback=(verify_callback) ⇒ Object

Sets the certificate verify callback



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# File 'lib/mechanize/http/agent.rb', line 1049

def verify_callback= verify_callback
  @http.verify_callback = verify_callback
end

#verify_mode ⇒ Object

How to verify SSL connections. Defaults to VERIFY_PEER



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# File 'lib/mechanize/http/agent.rb', line 1054

def verify_mode
  @http.verify_mode
end

#verify_mode=(verify_mode) ⇒ Object

Sets the mode for verifying SSL connections



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# File 'lib/mechanize/http/agent.rb', line 1059

def verify_mode= verify_mode
  @http.verify_mode = verify_mode
end

#visited_page(url) ⇒ Object

Returns a visited page for the url passed in, otherwise nil



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# File 'lib/mechanize/http/agent.rb', line 343

def visited_page url
  @history.visited_page resolve url
end

#webrobots ⇒ Object 



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# File 'lib/mechanize/http/agent.rb', line 969

def webrobots
  @webrobots ||= WebRobots.new(@user_agent, :http_get => method(:get_robots))
end