1 files changed, 315 insertions, 0 deletions
diff --git a/lib/mauve/pop3_server.rb b/lib/mauve/pop3_server.rb
new file mode 100644
index 0000000..b83e839
--- /dev/null
+++ b/lib/mauve/pop3_server.rb
@@ -0,0 +1,315 @@
+require 'thin'
+require 'mauve/mauve_thread'
+require 'digest/sha1'
+
+module Mauve
+  # 
+  # API to control the web server
+  #
+  class Pop3Server < MauveThread
+
+    include Singleton
+
+    attr_reader :port, :ip
+    
+    def initialize
+      super
+      self.port = 1110
+      self.ip = "0.0.0.0"
+    end
+   
+    def port=(pr)
+      raise ArgumentError, "port must be an integer between 0 and #{2**16-1}" unless pr.is_a?(Integer) and pr < 2**16 and pr > 0
+      @port = pr
+    end
+    
+    def ip=(i)
+      raise ArgumentError, "ip must be a string" unless i.is_a?(String)
+      #
+      # Use ipaddr to sanitize our IP.
+      #
+      @ip = IPAddr.new(i)
+    end
+
+    def logger
+      @logger ||= Log4r::Logger.new(self.class.to_s)
+    end
+
+    def main_loop
+      unless @server and @server.running?
+        @server = Mauve::Pop3Backend.new(@ip.to_s, @port)
+        logger.info "Listening on #{@server.to_s}"
+        @server.start
+      end
+    end
+
+    def stop
+      @server.stop if @server and @server.running?
+      super
+    end
+
+    def join
+      @server.stop! if @server and @server.running?
+      super
+    end
+
+  end    
+
+  class Pop3Backend < Thin::Backends::TcpServer
+
+    def logger
+      @logger ||= Log4r::Logger.new(self.class.to_s)
+    end
+        
+    # Connect the server
+    def connect
+      @signature = EventMachine.start_server(@host, @port, Pop3Connection)
+    end
+        
+  end
+
+
+  class Pop3Connection < EventMachine::Connection
+
+    attr_reader :user
+
+    CRLF = "\r\n"
+
+    def logger
+      @logger ||= Log4r::Logger.new(self.class.to_s)
+    end
+
+    def post_init
+      logger.info "New connection"
+      send_data "+OK #{self.class.to_s} started"
+      @state = :authorization
+      @user  = nil
+      @messages = []
+      @level    = nil
+    end
+
+    def permitted_commands(state=@state)
+     case @state
+        when :authorization
+          %w(QUIT USER PASS CAPA)
+        when :transaction
+          %w(QUIT STAT LIST RETR DELE NOOP RSET UIDL CAPA)
+        when :update
+          %w(QUIT)
+      end
+    end
+
+    def capabilities(state=@state)
+     case @state
+        when :transaction
+          %w(CAPA UIDL)
+        when :authorization
+          %w(CAPA UIDL USER) 
+        else
+          []
+      end
+    end
+
+    def receive_data (data)
+      data.split(CRLF).each do |d|
+        break if error?
+
+        if d =~ Regexp.new('\A('+self.permitted_commands.join("|")+')\b')
+          case $1
+            when "QUIT"
+              do_process_quit data
+            when "USER"
+              do_process_user data
+            when "PASS"
+              do_process_pass data
+            when "STAT"
+              do_process_stat data
+            when "LIST"
+              do_process_list data
+            when "RETR"
+              do_process_retr data
+            when "DELE"
+              do_process_dele data
+            when "NOOP"
+              do_process_noop data
+            when "RSET"
+              do_process_rset data
+            when "CAPA"
+              do_process_capa data
+            when "UIDL"
+              do_process_uidl data
+            else
+              do_process_error data
+          end
+        else
+          do_process_error data
+        end
+      end
+    end
+  
+    def send_data(d)
+      d += CRLF
+      super unless error?
+    end
+
+    def do_process_capa(a)
+      send_data (["+OK Capabilities follow:"] + self.capabilities + ["."]).join(CRLF)
+    end
+
+    def do_process_user(s)
+      allowed_levels = Mauve::AlertGroup::LEVELS.collect{|l| l.to_s}
+
+      if s =~ /\AUSER +(\w+)\+(#{allowed_levels.join("|")})/
+        # Allow alerts to be shown by level.
+        #
+        @user  = $1
+        @level = $2
+        #
+        send_data "+OK Only going to show #{@level} alerts."
+
+     elsif s =~ /\AUSER +([\w]+)/
+        @user =  $1
+
+        send_data "+OK"
+      else
+        send_data "-ERR Username not understood."
+      end
+    end
+
+    def do_process_pass(s)
+      
+      if @user and s =~ /\APASS +(\S+)/
+        if Mauve::Authentication.authenticate(@user, $1)
+          @state = :transaction
+          send_data "+OK Welcome #{@user} (#{@level})." 
+        else
+          send_data "-ERR Authentication failed."
+        end        
+      else
+        send_data "-ERR USER comes first."
+      end
+    end
+
+    def do_process_error(a)
+      send_data "-ERR Unknown comand."
+    end
+
+    def do_process_noop(a)
+      send_data "+OK Thanks."
+    end
+
+    alias do_process_dele do_process_noop
+
+    def do_process_quit(a)
+      @state = :update
+
+      send_data "+OK bye."
+
+      close_connection_after_writing
+    end
+
+    def do_process_stat(a)
+      send_data "+OK #{self.messages.length} #{self.messages.inject(0){|s,m| s+= m[1].length}}"
+    end
+
+    def do_process_list(a)
+      d = []
+      if a =~ /\ALIST +(\d+)\b/
+        ind = $1.to_i
+        if ind > 0 and ind <= self.messages.length
+          d << "+OK #{ind} #{self.messages[ind-1].length}"
+        else
+          d << "-ERR Unknown message."
+        end
+      else
+        d << "+OK #{self.messages.length} messages (#{self.messages.inject(0){|s,m| s+= m[1].length}} octets)."
+        self.messages.each_with_index{|m,i| d << "#{i+1} #{m.length}"}
+        d << "."
+      end
+
+      send_data d.join(CRLF)
+    end
+
+    def do_process_uidl(a)
+      if a =~ /\AUIDL +(\d+)\b/
+        ind = $1.to_i
+        if ind > 0 and ind <= self.messages.length
+          m = self.messages[ind-1][0].id
+          send_data "+OK #{ind} #{m}"
+        else
+          send_data "-ERR Message not found."
+        end
+      else
+        d = ["+OK "]
+        self.messages.each_with_index{|m,i| d << "#{i+1} #{m[0].id}"}
+        d << "."
+
+        send_data d.join(CRLF)
+      end
+    end
+
+    def do_process_retr(a)
+      if a =~ /\ARETR +(\d+)\b/
+        ind = $1.to_i
+        if ind > 0 and ind <= self.messages.length
+          alert_changed, msg = self.messages[ind-1]
+          send_data ["+OK #{msg.length} octets", msg, "."].join(CRLF)
+          note =  "#{alert_changed.update_type.capitalize} notification downloaded via POP3 by #{@user}" 
+          logger.info note+" about #{alert_changed}."
+          h = History.new(:alert_id => alert_changed.alert_id, :type => "notification", :event => note)
+          logger.error "Unable to save history due to #{h.errors.inspect}" if !h.save
+        else
+          send_data "-ERR Message not found."
+        end
+      else
+        send_data "-ERR Boo."
+      end
+
+    end
+
+    #
+    # These are the messages in the mailbox.
+    #
+    def messages
+      if @messages.empty?
+        @messages = []
+        smtp = Mauve::Notifiers::Email::Default.new("TODO: why do I need to put this argument here?")
+        alerts_seen = []
+
+        AlertChanged.all(:person => self.user).each do |a|
+          #
+          # Not interested in alerts 
+          #
+          next unless @level.nil? or a.level.to_s == @level
+
+          #
+          # Only one message per alert.
+          #
+          next if alerts_seen.include?([a.alert_id, a.update_type])
+
+          relevant = case a.update_type
+            when "raised"
+              a.alert.raised?
+            when "acknowledged"
+              a.alert.acknowledged?
+            when "cleared"
+              a.alert.cleared?
+            else
+              false
+          end
+
+          next unless relevant
+
+          alerts_seen << [a.alert_id, a.update_type]
+
+          @messages << [a, smtp.prepare_message(self.user, a.alert, [])]
+        end
+      end
+      
+      @messages
+    end
+
+  end
+
+end
+