Class: Mechanize::HTTP::WWWAuthenticateParser

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

Overview

Parses the WWW-Authenticate HTTP header into separate challenges.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ WWWAuthenticateParser

Creates a new header parser for WWW-Authenticate headers

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 15 def initialize @scanner = nil end

Instance Attribute Details

#scanner ⇒ Object

:nodoc:

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 10 def scanner @scanner end

Instance Method Details

#auth_param ⇒ Object

auth-param = token “=” ( token | quoted-string )

Parses an auth parameter

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 129 def auth_param return nil unless name = token return nil unless @scanner.scan(/ *= */) value = if @scanner.peek(1) == '"' then quoted_string else token end return nil unless value return name, value end

#parse(www_authenticate) ⇒ Object

Parsers the header. Returns an Array of challenges as strings

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 22 def parse www_authenticate challenges = [] @scanner = StringScanner.new www_authenticate while true do break if @scanner.eos? start = @scanner.pos challenge = Mechanize::HTTP::AuthChallenge.new scheme = auth_scheme if scheme == 'Negotiate' scan_comma_spaces end break unless scheme challenge.scheme = scheme space = spaces if scheme == 'NTLM' then if space then challenge.params = @scanner.scan(/.*/) end challenge.raw = www_authenticate[start, @scanner.pos] challenges << challenge next else scheme.capitalize! end next unless space params = {} while true do pos = @scanner.pos name, value = auth_param name.downcase! if name =~ /^realm$/i unless name then challenge.params = params challenges << challenge if @scanner.eos? then challenge.raw = www_authenticate[start, @scanner.pos] break end @scanner.pos = pos # rewind  challenge.raw = www_authenticate[start, @scanner.pos].sub(/(,+)? *$/, '') challenge = nil # a token should be next, new challenge  break else params[name] = value end spaces @scanner.scan(/(, *)+/) end end challenges end

#quoted_string ⇒ Object

quoted-string = ( <“> *(qdtext | quoted-pair ) <”> )

qdtext = <any TEXT except <">> quoted-pair = "\" CHAR

For TEXT, the rules of RFC 2047 are ignored.

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 151 def quoted_string return nil unless @scanner.scan(/"/) text = String.new while true do chunk = @scanner.scan(/[\r\n \t\x21\x23-\x7e\u0080-\u00ff]+/) # not " which is \x22  if chunk then text << chunk text << @scanner.get_byte if chunk.end_with? '\\' and '"' == @scanner.peek(1) else if '"' == @scanner.peek(1) then @scanner.get_byte break else return nil end end end text end

#scan_comma_spaces ⇒ Object

scans a comma followed by spaces needed for Negotiation, NTLM

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 104 def scan_comma_spaces @scanner.scan(/, +/) end

#spaces ⇒ Object

1*SP

Parses spaces

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 95 def spaces @scanner.scan(/ +/) end

#token ⇒ Object Also known as: auth_scheme

token = 1*<any CHAR except CTLs or separators>

Parses a token

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# File 'lib/mechanize/http/www_authenticate_parser.rb', line 113 def token @scanner.scan(/[^\000-\037\177()<>@,;:\\"\/\[\]?={} ]+/) end