=begin

= net/http.rb version 1.2.0

  maintained by Minero Aoki <aamine@dp.u-netsurf.ne.jp>
  This file is derived from "http-access.rb".

  This program is free software.
  You can distribute/modify this program under
  the terms of the Ruby Distribute License.

  Japanese version of this document is in "net" full package.
  You can get it from RAA
  (Ruby Application Archive: http://www.ruby-lang.org/en/raa.html).


= class Net::HTTP

== Class Methods

: new( address = 'localhost', port = 80, proxy_addr = nil, proxy_port = nil )
  creates a new Net::HTTP object.
  If proxy_addr is given, this method is equals to
  Net::HTTP::Proxy(proxy_addr,proxy_port).

: start( address = 'localhost', port = 80, proxy_addr = nil, proxy_port = nil )
: start( address = 'localhost', port = 80, proxy_addr = nil, proxy_port = nil ) {|http| .... }
  is equals to
    Net::HTTP.new( address, port, proxy_addr, proxy_port ).start(&block)

: Proxy( address, port )
  creates a HTTP proxy class.
  Arguments are address/port of proxy host.
  You can replace HTTP class by this proxy class.

    # example
    proxy_http = HTTP::Proxy( 'proxy.foo.org', 8080 )
      :
    proxy_http.start( 'www.ruby-lang.org' ) do |http|
      # connecting proxy.foo.org:8080
      :
    end

: proxy_class?
  If self is HTTP, false.
  If self is a class which was created by HTTP::Proxy(), true.

: port
  HTTP default port (80).


== Instance Methods

: start
: start {|http| .... }
  creates a new Net::HTTP object and starts HTTP session.

  When this method is called with block, gives HTTP object to block
  and close HTTP session after block call finished.

: proxy?
  true if self is a HTTP proxy class

: proxy_address
  address of proxy host. If self is not a proxy, nil.

: proxy_port
  port number of proxy host. If self is not a proxy, nil.

: get( path, header = nil, dest = '' )
: get( path, header = nil ) {|str| .... }
  gets data from "path" on connecting host.
  "header" must be a Hash like { 'Accept' => '*/*', ... }.
  Response body is written into "dest" by using "<<" method.
  This method returns Net::HTTPResponse object.

    # example
    response = http.get( '/index.html' )

  If called with block, give a part String of entity body.

: head( path, header = nil )
  gets only header from "path" on connecting host.
  "header" is a Hash like { 'Accept' => '*/*', ... }.
  This method returns a Net::HTTPResponse object.
  You can http header from this object like:

    response['content-length']   #-> '2554'
    response['content-type']     #-> 'text/html'
    response['Content-Type']     #-> 'text/html'
    response['CoNtEnT-tYpe']     #-> 'text/html'

: post( path, data, header = nil, dest = '' )
: post( path, data, header = nil ) {|str| .... }
  posts "data" (must be String) to "path".
  If the body exists, also gets entity body.
  Response body is written into "dest" by using "<<" method.
  "header" must be a Hash like { 'Accept' => '*/*', ... }.
  This method returns Net::HTTPResponse object.

  If called with block, gives a part of entity body string.


: request( request, [src] )
: request( request, [src] ) {|response| .... }
  sends REQUEST to (remote) http server. This method also writes
  string from SRC before it if REQUEST is a post/put request.
  (giving SRC for get/head request causes ArgumentError.)

  If called with block, gives a HTTP response object to the block.


= class Net::HTTP::Get, Head, Post

HTTP request classes. These classes wraps request header and
entity path. All "key" is case-insensitive.

== Methods

: self[ key ]
  returns header field for "key".

: self[ key ] = val
  set header to "val".


= class Net::HTTPResponse

HTTP response class. This class wraps response header and entity.
All "key" is case-insensitive.

== Methods

: body
  the entity body. ("dest" argument for HTTP#get, post, put)

: self[ key ]
  returns header field for "key".
  for HTTP, value is a string like 'text/plain'(for Content-Type),
  '2045'(for Content-Length), 'bytes 0-1024/10024'(for Content-Range).
  Multiple header had be joined by HTTP1.1 scheme.

: self[ key ] = val
  set field value for "key".

: key?( key )
  true if key exists

: each {|name,value| .... }
  iterates for each field name and value pair

: code
  HTTP result code string. For example, '302'

: message
  HTTP result message. For example, 'Not Found'

: read_body( dest = '' )
: body( dest = '' )
  gets response body.
  It is written into "dest" using "<<" method.
  If this method is called twice or more, nothing will be done and
  returns first "dest".

: read_body {|str| .... }
: body {|str| .... }
  gets response body with block.


= Swithing Net::HTTP versions

You can use Net::HTTP 1.1 features by calling HTTP.old_implementation.
And calling Net::HTTP.new_implementation allows you to use 1.2 features
again.

  # example
  HTTP.start {|http1| ...(http1 has 1.2 features)... }

  HTTP.version_1_1
  HTTP.start {|http2| ...(http2 has 1.1 features)... }

  HTTP.version_1_2
  HTTP.start {|http3| ...(http3 has 1.2 features)... }

=end

require 'net/protocol'


module Net

  class HTTPBadResponse < StandardError; end


  class HTTP < Protocol

    HTTPVersion = '1.1'

    ###
    ### connection
    ###

    protocol_param :port, '80'


    def initialize( addr = nil, port = nil )
      super

      @proxy_address = nil
      @proxy_port = nil

      @curr_http_version = HTTPVersion
      @seems_1_0_server = false
    end

    private

    def conn_command( sock )
    end

    def do_finish
    end


    ###
    ### proxy
    ###

    public


    class << self

      def Proxy( p_addr, p_port = nil )
        ProxyMod.create_proxy_class( p_addr, p_port || self.port )
      end

      alias orig_new new

      def new( address = nil, port = nil, p_addr = nil, p_port = nil )
        c = p_addr ? self::Proxy(p_addr, p_port) : self
        i = c.orig_new( address, port )
        setvar i
        i
      end

      def start( address = nil, port = nil, p_addr = nil, p_port = nil, &block )
        new( address, port, p_addr, p_port ).start( &block )
      end

      def proxy_class?
        false
      end

      def proxy_address
        nil
      end

      def proxy_port
        nil
      end

    end

    def proxy?
      false
    end

    def proxy_address
      nil
    end

    def proxy_port
      nil
    end

    def edit_path( path )
      path
    end


    module ProxyMod

      class << self

        def create_proxy_class( p_addr, p_port )
          mod = self
          klass = Class.new( HTTP )
          klass.module_eval {
            include mod
            @proxy_address = p_addr
            @proxy_port    = p_port
          }
          def klass.proxy_class?
            true
          end

          def klass.proxy_address
            @proxy_address
          end

          def klass.proxy_port
            @proxy_port
          end

          klass
        end

      end

      def initialize( addr, port )
        super
        @proxy_address = type.proxy_address
        @proxy_port    = type.proxy_port
      end
    
      attr_reader :proxy_address, :proxy_port

      alias proxyaddr proxy_address
      alias proxyport proxy_port

      def proxy?
        true
      end
    
      private
    
      def conn_socket( addr, port )
        super @proxy_address, @proxy_port
      end

      def edit_path( path )
        'http://' + addr_port + path
      end
    
    end   # module ProxyMod


    #
    # for backward compatibility
    #

    @@newimpl = true

    class << self

      def version_1_2
        @@newimpl = true
      end

      def version_1_1
        @@newimpl = false
      end

      private

      def setvar( obj )
        f = @@newimpl
        obj.instance_eval { @newimpl = f }
      end

    end


    #
    # http operations
    #

    public

    def self.def_http_method( nm, hasdest, hasdata )
      name = nm.id2name.downcase
      cname = nm.id2name
      lineno = __LINE__ + 2
      src = <<"      ----"

        def #{name}( path, #{hasdata ? 'data,' : ''}
                     u_header = nil #{hasdest ? ',dest = nil, &block' : ''} )
          resp = nil
          request(
              #{cname}.new( path, u_header ) #{hasdata ? ',data' : ''}
          ) do |resp|
            resp.read_body( #{hasdest ? 'dest, &block' : ''} )
          end
          if @newimpl then
            resp
          else
            resp.value
            #{hasdest ? 'return resp, resp.body' : 'resp'}
          end
        end

        def #{name}2( path, #{hasdata ? 'data,' : ''}
                      u_header = nil, &block )
          request( #{cname}.new(path, u_header),
                   #{hasdata ? 'data,' : ''} &block )
        end
      ----
#puts src
      module_eval src, __FILE__, lineno
    end

    def_http_method :Get,  true,  false
    def_http_method :Head, false, false
    def_http_method :Post, true,  true
    def_http_method :Put,  false, true

    def request( req, *args )
      common_oper( req ) {
        req.__send__( :exec,
                      @socket, @curr_http_version,
                      edit_path(req.path),
                      header_defaults, *args )
        yield req.response if block_given?
      }
      req.response
    end


    private


    def common_oper( req )
      if not @socket then
        start
        req['connection'] = 'close'
      elsif @socket.closed? then
        re_connect
      end
      if @seems_1_0_server then
        req['connection'] = 'close'
      end

      yield req
      req.response.__send__ :terminate
      @curr_http_version = req.response.http_version

      if keep_alive? req, req.response then
        if @socket.closed? then
          @seems_1_0_server = true
          @socket.close
        end
      else
        @socket.close
      end

      req.response
    end

    def header_defaults
      h = {}
      h['Host']       = addr_port
      h['Connection'] = 'Keep-Alive'
      h['Accept']     = '*/*'
      h
    end

    def keep_alive?( request, response )
      if response.key? 'connection' then
        if /keep-alive/i === response['connection'] then
          return true
        end
      elsif response.key? 'proxy-connection' then
        if /keep-alive/i === response['proxy-connection'] then
          return true
        end
      elsif request.key? 'Connection' then
        if /keep-alive/i === request['Connection'] then
          return true
        end
      else
        if @curr_http_version == '1.1' then
          return true
        end
      end

      false
    end

    def addr_port
      address + (port == HTTP.port ? '' : ":#{port}")
    end

  end

  HTTPSession = HTTP



  class Code

    def http_mkchild( bodyexist = nil )
      c = mkchild(nil)
      be = if bodyexist.nil? then @body_exist else bodyexist end
      c.instance_eval { @body_exist = be }
      c
    end

    def body_exist?
      @body_exist
    end
  
  end

  HTTPInformationCode               = InformationCode.http_mkchild( false )
  HTTPSuccessCode                   = SuccessCode    .http_mkchild( true )
  HTTPRedirectionCode               = RetriableCode  .http_mkchild( true )
  HTTPRetriableCode = HTTPRedirectionCode
  HTTPClientErrorCode               = FatalErrorCode .http_mkchild( true )
  HTTPFatalErrorCode = HTTPClientErrorCode
  HTTPServerErrorCode               = ServerErrorCode.http_mkchild( true )


  HTTPSwitchProtocol                = HTTPInformationCode.http_mkchild

  HTTPOK                            = HTTPSuccessCode.http_mkchild
  HTTPCreated                       = HTTPSuccessCode.http_mkchild
  HTTPAccepted                      = HTTPSuccessCode.http_mkchild
  HTTPNonAuthoritativeInformation   = HTTPSuccessCode.http_mkchild
  HTTPNoContent                     = HTTPSuccessCode.http_mkchild( false )
  HTTPResetContent                  = HTTPSuccessCode.http_mkchild( false )
  HTTPPartialContent                = HTTPSuccessCode.http_mkchild

  HTTPMultipleChoice                = HTTPRedirectionCode.http_mkchild
  HTTPMovedPermanently              = HTTPRedirectionCode.http_mkchild
  HTTPMovedTemporarily              = HTTPRedirectionCode.http_mkchild
  HTTPNotModified                   = HTTPRedirectionCode.http_mkchild( false )
  HTTPUseProxy                      = HTTPRedirectionCode.http_mkchild( false )
  
  HTTPBadRequest                    = HTTPClientErrorCode.http_mkchild
  HTTPUnauthorized                  = HTTPClientErrorCode.http_mkchild
  HTTPPaymentRequired               = HTTPClientErrorCode.http_mkchild
  HTTPForbidden                     = HTTPClientErrorCode.http_mkchild
  HTTPNotFound                      = HTTPClientErrorCode.http_mkchild
  HTTPMethodNotAllowed              = HTTPClientErrorCode.http_mkchild
  HTTPNotAcceptable                 = HTTPClientErrorCode.http_mkchild
  HTTPProxyAuthenticationRequired   = HTTPClientErrorCode.http_mkchild
  HTTPRequestTimeOut                = HTTPClientErrorCode.http_mkchild
  HTTPConflict                      = HTTPClientErrorCode.http_mkchild
  HTTPGone                          = HTTPClientErrorCode.http_mkchild
  HTTPLengthRequired                = HTTPClientErrorCode.http_mkchild
  HTTPPreconditionFailed            = HTTPClientErrorCode.http_mkchild
  HTTPRequestEntityTooLarge         = HTTPClientErrorCode.http_mkchild
  HTTPRequestURITooLarge            = HTTPClientErrorCode.http_mkchild
  HTTPUnsupportedMediaType          = HTTPClientErrorCode.http_mkchild

  HTTPNotImplemented                = HTTPServerErrorCode.http_mkchild
  HTTPBadGateway                    = HTTPServerErrorCode.http_mkchild
  HTTPServiceUnavailable            = HTTPServerErrorCode.http_mkchild
  HTTPGatewayTimeOut                = HTTPServerErrorCode.http_mkchild
  HTTPVersionNotSupported           = HTTPServerErrorCode.http_mkchild



  ###
  ### request
  ###

  net_private {

  class HTTPRequest

    def initialize( path, uhead = nil )
      @path = path
      @u_header = tmp = {}
      return unless uhead
      uhead.each do |k,v|
        key = canonical(k)
        if tmp.key? key then
          $stderr.puts "WARNING: duplicated HTTP header: #{k}" if $VERBOSE
        end
        tmp[ key ] = v.strip
      end

      @socket = nil
      @response = nil
    end

    attr_reader :path
    attr_reader :response

    def inspect
      "\#<#{type}>"
    end

    def []( key )
      @u_header[ canonical key ]
    end

    def []=( key, val )
      @u_header[ canonical key ] = val
    end

    def key?( key )
      @u_header.key? canonical(key)
    end

    def delete( key )
      @u_header.delete canonical(key)
    end

    def each( &block )
      @u_header.each( &block )
    end

    def each_key( &block )
      @u_header.each_key( &block )
    end

    def each_value( &block )
      @u_header.each_value( &block )
    end


    private

    def canonical( k )
      k.split('-').collect {|i| i.capitalize }.join('-')
    end

    #
    # write
    #

    def exec( sock, ver, path, ihead )
      ready( sock, ihead ) {|header|
        request ver, path, header
      }
      @response
    end

    def ready( sock, ihead )
      @response = nil
      @socket = sock
      ihead.update @u_header
      yield ihead
      @response = get_response
      @sock = nil
    end

    def request( ver, path, header )
      @socket.writeline sprintf('%s %s HTTP/%s', type::METHOD, path, ver)
      header.each do |n,v|
        @socket.writeline n + ': ' + v
      end
      @socket.writeline ''
    end

    #
    # read
    #

    def get_response
      begin
        resp = read_response
      end while ContinueCode === resp
      resp
    end

    def read_response
      resp = get_resline

      while true do
        line = @socket.readuntil( "\n", true )   # ignore EOF
        line.sub!( /\s+\z/, '' )                 # don't use chop!
        break if line.empty?

        m = /\A([^:]+):\s*/.match( line )
        m or raise HTTPBadResponse, 'wrong header line format'
        nm = m[1]
        line = m.post_match
        if resp.key? nm then
          resp[nm] << ', ' << line
        else
          resp[nm] = line
        end
      end

      resp
    end

    def get_resline
      str = @socket.readline
      m = /\AHTTP(?:\/(\d+\.\d+))?\s+(\d\d\d)\s*(.*)\z/i.match( str )
      unless m then
        raise HTTPBadResponse, "wrong status line: #{str}"
      end
      httpver = m[1]
      status  = m[2]
      discrip = m[3]
      
      ::Net::NetPrivate::HTTPResponse.new(
              status, discrip, @socket, type::HAS_BODY, httpver )
    end
  
  end


  class HTTPRequestWithData < HTTPRequest
  
    private

    def exec( sock, ver, path, ihead, str = nil )
      check_arg str, block_given?

      if block_given? then
        ac = Accumulator.new
        yield ac              # must be yield, DO NOT USE block.call
        data = ac.terminate
      else
        data = str
      end

      ready( sock, ihead ) {|header|
        header['Content-Length'] = data.size.to_s
        header.delete 'Transfer-Encoding'
        request ver, path, header
        @socket.write data
      }
      @response
    end

    def check_arg( data, blkp )
      if data and blkp then
        raise ArgumentError, 'both of data and block given'
      end
      unless data or blkp then
        raise ArgumentError, 'str or block required'
      end
    end
  
  end


  class Accumulator
  
    def initialize
      @buf = ''
    end

    def write( s )
      @buf.concat s
    end

    alias << write

    def terminate
      ret = @buf
      @buf = nil
      ret
    end
  
  end

  }


  class HTTP

    class Get < ::Net::NetPrivate::HTTPRequest
      HAS_BODY = true
      METHOD = 'GET'
    end

    class Head < ::Net::NetPrivate::HTTPRequest
      HAS_BODY = false
      METHOD = 'HEAD'
    end

    class Post < ::Net::NetPrivate::HTTPRequestWithData
      HAS_BODY = true
      METHOD = 'POST'
    end

    class Put < ::Net::NetPrivate::HTTPRequestWithData
      HAS_BODY = true
      METHOD = 'PUT'
    end

  end



  ###
  ### response
  ###

  net_private {

  class HTTPResponse < Response

    CODE_CLASS_TO_OBJ = {
      '1' => HTTPInformationCode,
      '2' => HTTPSuccessCode,
      '3' => HTTPRedirectionCode,
      '4' => HTTPClientErrorCode,
      '5' => HTTPServerErrorCode
    }

    CODE_TO_OBJ = {
      '100' => ContinueCode,
      '101' => HTTPSwitchProtocol,

      '200' => HTTPOK,
      '201' => HTTPCreated,
      '202' => HTTPAccepted,
      '203' => HTTPNonAuthoritativeInformation,
      '204' => HTTPNoContent,
      '205' => HTTPResetContent,
      '206' => HTTPPartialContent,

      '300' => HTTPMultipleChoice,
      '301' => HTTPMovedPermanently,
      '302' => HTTPMovedTemporarily,
      '303' => HTTPMovedPermanently,
      '304' => HTTPNotModified,
      '305' => HTTPUseProxy,

      '400' => HTTPBadRequest,
      '401' => HTTPUnauthorized,
      '402' => HTTPPaymentRequired,
      '403' => HTTPForbidden,
      '404' => HTTPNotFound,
      '405' => HTTPMethodNotAllowed,
      '406' => HTTPNotAcceptable,
      '407' => HTTPProxyAuthenticationRequired,
      '408' => HTTPRequestTimeOut,
      '409' => HTTPConflict,
      '410' => HTTPGone,
      '411' => HTTPFatalErrorCode,
      '412' => HTTPPreconditionFailed,
      '413' => HTTPRequestEntityTooLarge,
      '414' => HTTPRequestURITooLarge,
      '415' => HTTPUnsupportedMediaType,

      '500' => HTTPFatalErrorCode,
      '501' => HTTPNotImplemented,
      '502' => HTTPBadGateway,
      '503' => HTTPServiceUnavailable,
      '504' => HTTPGatewayTimeOut,
      '505' => HTTPVersionNotSupported
    }


    def initialize( stat, msg, sock, be, hv )
      code = CODE_TO_OBJ[stat] ||
             CODE_CLASS_TO_OBJ[stat[0,1]] ||
             UnknownCode
      super code, stat, msg
      @socket = sock
      @body_exist = be
      @http_version = hv

      @header = {}
      @body = nil
      @read = false
    end

    attr_reader :http_version

    def inspect
      "#<#{type} #{code}>"
    end

    def []( key )
      @header[ key.downcase ]
    end

    def []=( key, val )
      @header[ key.downcase ] = val
    end

    def each( &block )
      @header.each( &block )
    end

    def each_key( &block )
      @header.each_key( &block )
    end

    def each_value( &block )
      @header.each_value( &block )
    end

    def delete( key )
      @header.delete key.downcase
    end

    def key?( key )
      @header.key? key.downcase
    end

    def to_hash
      @header.dup
    end

    def value
      unless SuccessCode === self then
        error! self
      end
    end


    #
    # header (for backward compatibility)
    #

    def read_header
      self
    end

    alias header read_header
    alias response read_header

    #
    # body
    #

    def read_body( dest = nil, &block )
      if @read and (dest or block) then
        raise IOError, "#{type}\#read_body called twice with argument"
      end

      unless @read then
        to = procdest( dest, block )
        stream_check

        if @body_exist and code_type.body_exist? then
          read_body_0 to
          @body = to
        else
          @body = nil
        end
        @read = true
      end

      @body
    end

    alias body read_body
    alias entity read_body


    private


    def terminate
      read_body
    end

    def read_body_0( dest )
      if chunked? then
        read_chunked dest
      else
        clen = content_length
        if clen then
          @socket.read clen, dest, true   # ignore EOF
        else
          clen = range_length
          if clen then
            @socket.read clen, dest
          else
            @socket.read_all dest
          end
        end
      end
    end

    def read_chunked( dest )
      len = nil
      total = 0

      while true do
        line = @socket.readline
        m = /[0-9a-fA-F]+/.match( line )
        unless m then
          raise HTTPBadResponse, "wrong chunk size line: #{line}"
        end
        len = m[0].hex
        break if len == 0
        @socket.read( len, dest ); total += len
        @socket.read 2   # \r\n
      end
      until @socket.readline.empty? do
        ;
      end
    end

    def content_length
      if @header.key? 'content-length' then
        m = /\d+/.match( @header['content-length'] )
        unless m then
          raise HTTPBadResponse, 'wrong Content-Length format'
        end
        m[0].to_i
      else
        nil
      end
    end

    def chunked?
      tmp = @header['transfer-encoding']
      tmp and /\bchunked\b/i === tmp
     end

    def range_length
      if @header.key? 'content-range' then
        m = %r<bytes\s+(\d+)-(\d+)/\d+>.match( @header['content-range'] )
        unless m then
          raise HTTPBadResponse, 'wrong Content-Range format'
        end
        l = m[2].to_i
        u = m[1].to_i
        if l > u then
          nil
        else
          u - l
        end
      else
        nil
      end
    end

    def stream_check
      if @socket.closed? then
        raise IOError, 'try to read body out of block'
      end
    end

    def procdest( dest, block )
      if dest and block then
        raise ArgumentError,
              'both of arg and block are given for HTTP method'
      end
      if block then
        ::Net::NetPrivate::ReadAdapter.new block
      else
        dest or ''
      end
    end

  end

  }

end   # module Net