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# -*- coding: binary -*-
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#
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# A helper module for using and referencing coming user agent strings.
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#
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module Rex::UserAgent
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  #
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  # Taken from https://www.whatismybrowser.com/guides/the-latest-user-agent/
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  #
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  COMMON_AGENTS = [
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    # Chrome
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    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36',
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    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36',
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    # Edge
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    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/123.0.2420.65',
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    # Safari
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    'Mozilla/5.0 (iPad; CPU OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1',
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    'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_4_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Safari/605.1.15',
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    # Firefox
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    'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0',
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    'Mozilla/5.0 (Macintosh; Intel Mac OS X 14.4; rv:124.0) Gecko/20100101 Firefox/124.0'
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  ]
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  #
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  # A randomly-selected agent that will be consistent for the duration of metasploit running
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  #
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  def self.session_agent
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    if @@session_agent
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      @@session_agent
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    else
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      @@session_agent = self.random
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    end
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  end
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  @@session_agent = nil
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  #
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  # Pick a random agent from the common agent list.
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  #
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  def self.random
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    COMMON_AGENTS.sample
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  end
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  #
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  # Choose the agent with the shortest string (for use in payloads)
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  #
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  def self.shortest
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    @@shortest_agent ||= COMMON_AGENTS.min { |a, b| a.size <=> b.size }
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  end
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  #
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  # Choose the most frequent user agent
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  #
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  def self.most_common
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    COMMON_AGENTS[0]
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  end
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end
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