Class: Zold::Score

Inherits:
Object
  • Object
show all
Defined in:
lib/zold/score.rb

Overview

Score

Constant Summary collapse

STRENGTH =

Default strength for the entire system, in production mode.

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ZERO =

The default no-value score.

Score.new(Time.now, 'localhost', 80, 'NOPREFIX@ffffffffffffffff')

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(time, host, port, invoice, suffixes = [], strength: STRENGTH) ⇒ Score

time: UTC ISO 8601 string



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# File 'lib/zold/score.rb', line 37

def initialize(time, host, port, invoice, suffixes = [], strength: STRENGTH)
  raise "Invalid host name: #{host}" unless host =~ /^[a-z0-9\.-]+$/
  raise 'Time must be of type Time' unless time.is_a?(Time)
  raise 'Port must be of type Integer' unless port.is_a?(Integer)
  raise "Invalid TCP port: #{port}" if port <= 0 || port > 65_535
  raise "Invoice '#{invoice}' has wrong format" unless invoice =~ /^[a-zA-Z0-9]{8,32}@[a-f0-9]{16}$/
  @time = time
  @host = host
  @port = port
  @invoice = invoice
  @suffixes = suffixes
  @strength = strength
end

Instance Attribute Details

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/zold/score.rb', line 35

def host
  @host
end

#invoice ⇒ Object (readonly)

Returns the value of attribute invoice.



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# File 'lib/zold/score.rb', line 35

def invoice
  @invoice
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/zold/score.rb', line 35

def port
  @port
end

#strength ⇒ Object (readonly)

Returns the value of attribute strength.



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# File 'lib/zold/score.rb', line 35

def strength
  @strength
end

#time ⇒ Object (readonly)

Returns the value of attribute time.



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# File 'lib/zold/score.rb', line 35

def time
  @time
end

Class Method Details

.parse(text, strength: STRENGTH) ⇒ Object 



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# File 'lib/zold/score.rb', line 67

def self.parse(text, strength: STRENGTH)
  m = Regexp.new(
    '^' + [
      '([0-9]+:)',
      '(?<time>[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z)',
      '(?<host>[0-9a-z\.\-]+)',
      '(?<port>[0-9]+)',
      '(?<invoice>[a-zA-Z0-9]{8,32}@[a-f0-9]{16})',
      '(?<suffixes>[a-zA-Z0-9 ]+)'
    ].join(' ') + '$'
  ).match(text)
  raise "Invalid score '#{text}'" if m.nil?
  Score.new(
    Time.parse(m[:time]), m[:host],
    m[:port].to_i, m[:invoice],
    m[:suffixes].split(' '),
    strength: strength
  )
end

.parse_json(json) ⇒ Object 



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# File 'lib/zold/score.rb', line 54

def self.parse_json(json)
  raise "Time in JSON is broken: #{json}" unless json['time'] =~ /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z$/
  raise "Host is wrong: #{json}" unless json['host'] =~ /^[0-9a-z\.\-]+$/
  raise "Port is wrong: #{json}" unless json['port'].is_a?(Integer)
  raise "Invoice is wrong: #{json}" unless json['invoice'] =~ /^[a-zA-Z0-9]{8,32}@[a-f0-9]{16}$/
  raise "Suffixes not array: #{json}" unless json['suffixes'].is_a?(Array)
  Score.new(
    Time.parse(json['time']), json['host'],
    json['port'], json['invoice'], json['suffixes'],
    strength: json['strength']
  )
end

.parse_text(text, strength: STRENGTH) ⇒ Object 



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# File 'lib/zold/score.rb', line 87

def self.parse_text(text, strength: STRENGTH)
  parts = text.split(' ', 6)
  Score.new(
    Time.at(parts[0].hex),
    parts[1],
    parts[2].hex,
    "#{parts[3]}@#{parts[4]}",
    parts[5].split(' '),
    strength: strength
  )
end

Instance Method Details

#age_hours ⇒ Object 



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# File 'lib/zold/score.rb', line 164

def age_hours
  (Time.now - @time) / 60
end

#expired? ⇒ Boolean 



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# File 'lib/zold/score.rb', line 168

def expired?
  @time < Time.now - 24 * 60 * 60
end

#hash ⇒ Object 



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# File 'lib/zold/score.rb', line 99

def hash
  raise 'Score has zero value, there is no hash' if @suffixes.empty?
  @suffixes.reduce(prefix) do |pfx, suffix|
    Digest::SHA256.hexdigest(pfx + ' ' + suffix)[0, 63]
  end
end

#next ⇒ Object 



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# File 'lib/zold/score.rb', line 150

def next
  raise 'This score is not valid' unless valid?
  idx = 0
  loop do
    suffix = idx.to_s(16)
    score = Score.new(
      @time, @host, @port, @invoice, @suffixes + [suffix],
      strength: @strength
    )
    return score if score.valid?
    idx += 1
  end
end

#prefix ⇒ Object 



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# File 'lib/zold/score.rb', line 172

def prefix
  "#{@time.utc.iso8601} #{@host} #{@port} #{@invoice}"
end

#reduced(max = 4) ⇒ Object 



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# File 'lib/zold/score.rb', line 142

def reduced(max = 4)
  raise "The length of the score is #{@suffixes.count}, can't reduce to #{max}" if max > @suffixes.count
  Score.new(
    @time, @host, @port, @invoice,
    @suffixes[0..max - 1], strength: @strength
  )
end

#to_h ⇒ Object 



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# File 'lib/zold/score.rb', line 129

def to_h
  {
    value: value,
    host: @host,
    port: @port,
    invoice: @invoice,
    time: @time.utc.iso8601,
    suffixes: @suffixes,
    strength: @strength,
    hash: value.zero? ? nil : hash
  }
end

#to_s ⇒ Object 



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# File 'lib/zold/score.rb', line 118

def to_s
  [
    "#{value}:",
    @time.utc.iso8601,
    @host,
    @port,
    @invoice,
    @suffixes.join(' ')
  ].join(' ')
end

#to_text ⇒ Object 



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# File 'lib/zold/score.rb', line 106

def to_text
  pfx, bnf = @invoice.split('@')
  [
    @time.to_i.to_s(16),
    @host,
    @port.to_s(16),
    pfx,
    bnf,
    @suffixes.join(' ')
  ].join(' ')
end

#valid? ⇒ Boolean 



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# File 'lib/zold/score.rb', line 176

def valid?
  @suffixes.empty? || hash.end_with?('0' * @strength)
end

#value ⇒ Object 



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# File 'lib/zold/score.rb', line 180

def value
  @suffixes.length
end