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# -*- encoding: binary -*-

require 'fileutils'
require 'set'
require 'tempfile'

require 'rack/multipart'

if RUBY_VERSION[/^\d+\.\d+/] == '1.8'
  # pull in backports
  require 'rack/backports/uri/common'
else
  require 'uri/common'
end

module Rack
  # Rack::Utils contains a grab-bag of useful methods for writing web
  # applications adopted from all kinds of Ruby libraries.

  module Utils
    # URI escapes a string. (CGI style space to +)
    def escape(s)
      URI.encode_www_form_component(s)
    end
    module_function :escape

    # Like URI escaping, but with %20 instead of +. Strictly speaking this is
    # true URI escaping.
    def escape_path(s)
      escape(s).gsub('+', '%20')
    end
    module_function :escape_path

    # Unescapes a URI escaped string.
    def unescape(s)
      URI.decode_www_form_component(s)
    end
    module_function :unescape

    DEFAULT_SEP = /[&;] */n

    # Stolen from Mongrel, with some small modifications:
    # Parses a query string by breaking it up at the '&'
    # and ';' characters. You can also use this to parse
    # cookies by changing the characters used in the second
    # parameter (which defaults to '&;').
    def parse_query(qs, d = nil)
      params = {}

      (qs || '').split(d ? /[#{d}] */n : DEFAULT_SEP).each do |p|
        k, v = p.split('=', 2).map { |x| unescape(x) }
        if cur = params[k]
          if cur.class == Array
            params[k] << v
          else
            params[k] = [cur, v]
          end
        else
          params[k] = v
        end
      end

      return params
    end
    module_function :parse_query

    def parse_nested_query(qs, d = nil)
      params = {}

      (qs || '').split(d ? /[#{d}] */n : DEFAULT_SEP).each do |p|
        k, v = p.split('=', 2).map { |s| unescape(s) }
        normalize_params(params, k, v)
      end

      return params
    end
    module_function :parse_nested_query

    def normalize_params(params, name, v = nil)
      name =~ %r(\A[\[\]]*([^\[\]]+)\]*)
      k = $1 || ''
      after = $' || ''

      return if k.empty?

      if after == ""
        params[k] = v
      elsif after == "[]"
        params[k] ||= []
        raise TypeError, "expected Array (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Array)
        params[k] << v
      elsif after =~ %r(^\[\]\[([^\[\]]+)\]$) || after =~ %r(^\[\](.+)$)
        child_key = $1
        params[k] ||= []
        raise TypeError, "expected Array (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Array)
        if params[k].last.is_a?(Hash) && !params[k].last.key?(child_key)
          normalize_params(params[k].last, child_key, v)
        else
          params[k] << normalize_params({}, child_key, v)
        end
      else
        params[k] ||= {}
        raise TypeError, "expected Hash (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Hash)
        params[k] = normalize_params(params[k], after, v)
      end

      return params
    end
    module_function :normalize_params

    def build_query(params)
      params.map { |k, v|
        if v.class == Array
          build_query(v.map { |x| [k, x] })
        else
          "#{escape(k)}=#{escape(v)}"
        end
      }.join("&")
    end
    module_function :build_query

    def build_nested_query(value, prefix = nil)
      case value
      when Array
        value.map { |v|
          build_nested_query(v, "#{prefix}[]")
        }.join("&")
      when Hash
        value.map { |k, v|
          build_nested_query(v, prefix ? "#{prefix}[#{escape(k)}]" : escape(k))
        }.join("&")
      when String
        raise ArgumentError, "value must be a Hash" if prefix.nil?
        "#{prefix}=#{escape(value)}"
      else
        prefix
      end
    end
    module_function :build_nested_query

    ESCAPE_HTML = {
      "&" => "&amp;",
      "<" => "&lt;",
      ">" => "&gt;",
      "'" => "&#x27;",
      '"' => "&quot;",
      "/" => "&#x2F;"
    }
    ESCAPE_HTML_PATTERN = Regexp.union(*ESCAPE_HTML.keys)

    # Escape ampersands, brackets and quotes to their HTML/XML entities.
    def escape_html(string)
      string.to_s.gsub(ESCAPE_HTML_PATTERN){|c| ESCAPE_HTML[c] }
    end
    module_function :escape_html

    def select_best_encoding(available_encodings, accept_encoding)
      # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

      expanded_accept_encoding =
        accept_encoding.map { |m, q|
          if m == "*"
            (available_encodings - accept_encoding.map { |m2, _| m2 }).map { |m2| [m2, q] }
          else
            [[m, q]]
          end
        }.inject([]) { |mem, list|
          mem + list
        }

      encoding_candidates = expanded_accept_encoding.sort_by { |_, q| -q }.map { |m, _| m }

      unless encoding_candidates.include?("identity")
        encoding_candidates.push("identity")
      end

      expanded_accept_encoding.find_all { |m, q|
        q == 0.0
      }.each { |m, _|
        encoding_candidates.delete(m)
      }

      return (encoding_candidates & available_encodings)[0]
    end
    module_function :select_best_encoding

    def set_cookie_header!(header, key, value)
      case value
      when Hash
        domain = "; domain=" + value[:domain] if value[:domain]
        path = "; path=" + value[:path] if value[:path]
        # According to RFC 2109, we need dashes here.
        # N.B.: cgi.rb uses spaces...
        expires = "; expires=" +
          rfc2822(value[:expires].clone.gmtime) if value[:expires]
        secure = "; secure" if value[:secure]
        httponly = "; HttpOnly" if value[:httponly]
        value = value[:value]
      end
      value = [value] unless Array === value
      cookie = escape(key) + "=" +
        value.map { |v| escape v }.join("&") +
        "#{domain}#{path}#{expires}#{secure}#{httponly}"

      case header["Set-Cookie"]
      when nil, ''
        header["Set-Cookie"] = cookie
      when String
        header["Set-Cookie"] = [header["Set-Cookie"], cookie].join("\n")
      when Array
        header["Set-Cookie"] = (header["Set-Cookie"] + [cookie]).join("\n")
      end

      nil
    end
    module_function :set_cookie_header!

    def delete_cookie_header!(header, key, value = {})
      case header["Set-Cookie"]
      when nil, ''
        cookies = []
      when String
        cookies = header["Set-Cookie"].split("\n")
      when Array
        cookies = header["Set-Cookie"]
      end

      cookies.reject! { |cookie|
        if value[:domain]
          cookie =~ /\A#{escape(key)}=.*domain=#{value[:domain]}/
        else
          cookie =~ /\A#{escape(key)}=/
        end
      }

      header["Set-Cookie"] = cookies.join("\n")

      set_cookie_header!(header, key,
                 {:value => '', :path => nil, :domain => nil,
                   :expires => Time.at(0) }.merge(value))

      nil
    end
    module_function :delete_cookie_header!

    # Return the bytesize of String; uses String#size under Ruby 1.8 and
    # String#bytesize under 1.9.
    if ''.respond_to?(:bytesize)
      def bytesize(string)
        string.bytesize
      end
    else
      def bytesize(string)
        string.size
      end
    end
    module_function :bytesize

    # Modified version of stdlib time.rb Time#rfc2822 to use '%d-%b-%Y' instead
    # of '% %b %Y'.
    # It assumes that the time is in GMT to comply to the RFC 2109.
    #
    # NOTE: I'm not sure the RFC says it requires GMT, but is ambigous enough
    # that I'm certain someone implemented only that option.
    # Do not use %a and %b from Time.strptime, it would use localized names for
    # weekday and month.
    #
    def rfc2822(time)
      wday = Time::RFC2822_DAY_NAME[time.wday]
      mon = Time::RFC2822_MONTH_NAME[time.mon - 1]
      time.strftime("#{wday}, %d-#{mon}-%Y %H:%M:%S GMT")
    end
    module_function :rfc2822

    # Parses the "Range:" header, if present, into an array of Range objects.
    # Returns nil if the header is missing or syntactically invalid.
    # Returns an empty array if none of the ranges are satisfiable.
    def byte_ranges(env, size)
      # See <http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35>
      http_range = env['HTTP_RANGE']
      return nil unless http_range
      ranges = []
      http_range.split(/,\s*/).each do |range_spec|
        matches = range_spec.match(/bytes=(\d*)-(\d*)/)
        return nil unless matches
        r0,r1 = matches[1], matches[2]
        if r0.empty?
          return nil if r1.empty?
          # suffix-byte-range-spec, represents trailing suffix of file
          r0 = [size - r1.to_i, 0].max
          r1 = size - 1
        else
          r0 = r0.to_i
          if r1.empty?
            r1 = size - 1
          else
            r1 = r1.to_i
            return nil if r1 < r0 # backwards range is syntactically invalid
            r1 = size-1 if r1 >= size
          end
        end
        ranges << (r0..r1) if r0 <= r1
      end
      ranges
    end
    module_function :byte_ranges

    # Context allows the use of a compatible middleware at different points
    # in a request handling stack. A compatible middleware must define
    # #context which should take the arguments env and app. The first of which
    # would be the request environment. The second of which would be the rack
    # application that the request would be forwarded to.
    class Context
      attr_reader :for, :app

      def initialize(app_f, app_r)
        raise 'running context does not respond to #context' unless app_f.respond_to? :context
        @for, @app = app_f, app_r
      end

      def call(env)
        @for.context(env, @app)
      end

      def recontext(app)
        self.class.new(@for, app)
      end

      def context(env, app=@app)
        recontext(app).call(env)
      end
    end

    # A case-insensitive Hash that preserves the original case of a
    # header when set.
    class HeaderHash < Hash
      def self.new(hash={})
        HeaderHash === hash ? hash : super(hash)
      end

      def initialize(hash={})
        super()
        @names = {}
        hash.each { |k, v| self[k] = v }
      end

      def each
        super do |k, v|
          yield(k, v.respond_to?(:to_ary) ? v.to_ary.join("\n") : v)
        end
      end

      def to_hash
        Hash[*map do |k, v|
          [k, v.respond_to?(:to_ary) ? v.to_ary.join("\n") : v]
        end.flatten]
      end

      def [](k)
        super(k) || super(@names[k.downcase])
      end

      def []=(k, v)
        canonical = k.downcase
        delete k if @names[canonical] && @names[canonical] != k # .delete is expensive, don't invoke it unless necessary
        @names[k] = @names[canonical] = k
        super k, v
      end

      def delete(k)
        canonical = k.downcase
        result = super @names.delete(canonical)
        @names.delete_if { |name,| name.downcase == canonical }
        result
      end

      def include?(k)
        @names.include?(k) || @names.include?(k.downcase)
      end

      alias_method :has_key?, :include?
      alias_method :member?, :include?
      alias_method :key?, :include?

      def merge!(other)
        other.each { |k, v| self[k] = v }
        self
      end

      def merge(other)
        hash = dup
        hash.merge! other
      end

      def replace(other)
        clear
        other.each { |k, v| self[k] = v }
        self
      end
    end

    # Every standard HTTP code mapped to the appropriate message.
    # Generated with:
    # curl -s http://www.iana.org/assignments/http-status-codes | \
    # ruby -ane 'm = /^(\d{3}) +(\S[^\[(]+)/.match($_) and
    # puts " #{m[1]} => \x27#{m[2].strip}x27,"'
    HTTP_STATUS_CODES = {
      100 => 'Continue',
      101 => 'Switching Protocols',
      102 => 'Processing',
      200 => 'OK',
      201 => 'Created',
      202 => 'Accepted',
      203 => 'Non-Authoritative Information',
      204 => 'No Content',
      205 => 'Reset Content',
      206 => 'Partial Content',
      207 => 'Multi-Status',
      226 => 'IM Used',
      300 => 'Multiple Choices',
      301 => 'Moved Permanently',
      302 => 'Found',
      303 => 'See Other',
      304 => 'Not Modified',
      305 => 'Use Proxy',
      306 => 'Reserved',
      307 => 'Temporary Redirect',
      400 => 'Bad Request',
      401 => 'Unauthorized',
      402 => 'Payment Required',
      403 => 'Forbidden',
      404 => 'Not Found',
      405 => 'Method Not Allowed',
      406 => 'Not Acceptable',
      407 => 'Proxy Authentication Required',
      408 => 'Request Timeout',
      409 => 'Conflict',
      410 => 'Gone',
      411 => 'Length Required',
      412 => 'Precondition Failed',
      413 => 'Request Entity Too Large',
      414 => 'Request-URI Too Long',
      415 => 'Unsupported Media Type',
      416 => 'Requested Range Not Satisfiable',
      417 => 'Expectation Failed',
      422 => 'Unprocessable Entity',
      423 => 'Locked',
      424 => 'Failed Dependency',
      426 => 'Upgrade Required',
      500 => 'Internal Server Error',
      501 => 'Not Implemented',
      502 => 'Bad Gateway',
      503 => 'Service Unavailable',
      504 => 'Gateway Timeout',
      505 => 'HTTP Version Not Supported',
      506 => 'Variant Also Negotiates',
      507 => 'Insufficient Storage',
      510 => 'Not Extended',
    }

    # Responses with HTTP status codes that should not have an entity body
    STATUS_WITH_NO_ENTITY_BODY = Set.new((100..199).to_a << 204 << 304)

    SYMBOL_TO_STATUS_CODE = Hash[*HTTP_STATUS_CODES.map { |code, message|
      [message.downcase.gsub(/\s|-/, '_').to_sym, code]
    }.flatten]

    def status_code(status)
      if status.is_a?(Symbol)
        SYMBOL_TO_STATUS_CODE[status] || 500
      else
        status.to_i
      end
    end
    module_function :status_code

    Multipart = Rack::Multipart

  end
end
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