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# frozen_string_literal: true
module Gitlab
module RobotsTxt
class Parser
DISALLOW_REGEX = /^disallow: /i.freeze
ALLOW_REGEX = /^allow: /i.freeze
attr_reader :disallow_rules, :allow_rules
def initialize(content)
@raw_content = content
@disallow_rules, @allow_rules = parse_raw_content!
end
def disallowed?(path)
return false if allow_rules.any? { |rule| path =~ rule }
disallow_rules.any? { |rule| path =~ rule }
end
private
# This parser is very basic as it only knows about `Disallow:`
# and `Allow:` lines, and simply ignores all other lines.
#
# Patterns ending in `$`, and `*` for 0 or more characters are recognized.
#
# It is case insensitive and `Allow` rules takes precedence
# over `Disallow`.
def parse_raw_content!
disallowed = []
allowed = []
@raw_content.each_line.each do |line|
if disallow_rule?(line)
disallowed << get_disallow_pattern(line)
elsif allow_rule?(line)
allowed << get_allow_pattern(line)
end
end
[disallowed, allowed]
end
def disallow_rule?(line)
line =~ DISALLOW_REGEX
end
def get_disallow_pattern(line)
get_pattern(line, DISALLOW_REGEX)
end
def allow_rule?(line)
line =~ ALLOW_REGEX
end
def get_allow_pattern(line)
get_pattern(line, ALLOW_REGEX)
end
def get_pattern(line, rule_regex)
value = line.sub(rule_regex, '').strip
value = Regexp.escape(value).gsub('\*', '.*')
value = value.sub(/\\\$$/, '$')
Regexp.new("^#{value}")
end
end
end
end
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