Class: EventMachine::EmailServer::POP3Server

Inherits:
Connection
  • Object
show all
Defined in:
lib/eventmachine/email_server/pop3_server.rb

Constant Summary collapse

@@capabilities = 
[ "TOP", "USER", "UIDL" ]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hostname, userstore, emailstore) ⇒ POP3Server 



10
11
12
13
14
15
16
17
18
19
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 10

def initialize(hostname, userstore, emailstore)
  @hostname = hostname
  @userstore = userstore
  @emailstore = emailstore
  @state = 'auth' # 'trans' and 'data'
  @auth_attempts = 0
  @apop_challenge = "<#{rand(10**4 - 1)}.#{rand(10**9 - 1)}@#{@hostname}>"
  @debug = false
  @emails = Array.new
end

Instance Attribute Details

#debug ⇒ Object

Returns the value of attribute debug.



8
9
10
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 8

def debug
  @debug
end

Instance Method Details

#apop(username, hash) ⇒ Object 



282
283
284
285
286
287
288
289
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 282

def apop(username, hash)
	user(username)
	return false unless @user
	if Digest::MD5.new.update("#{@apop_challenge}#{@user.password}").hexdigest == hash
		return true
	end
	false
end

#auth_state(line) ⇒ Object 



60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 60

def auth_state(line)
  			case line
  			when /^QUIT$/
send("+OK dewey POP3 server signing off", true)
  when /^CAPA$/
    send("+OK Capability list follows\r\n"+@@capabilities.join("\r\n")+"\r\n.")
  			when /^USER (.+)$/
user($1)
if @user
	send("+OK #{@user.username} is most welcome here")
else
	@failed += 1
	if @failed > 2
		send("-ERR you're out!", true)
      else
			send("-ERR sorry, no mailbox for #{$1} here")
	end
end
  			when /^PASS (.+)$/
if pass($1)
	@state = 'trans'
	emails
	msgs, bytes = stat
	send("+OK #{@user.username}'s maildrop has #{msgs} messages (#{bytes} octets)")
else
	@failed += 1
	if @failed > 2
		send("-ERR you're out!", true)
      else
        send("-ERR no dope.")
      end
end
  			when /^APOP ([^\s]+) (.+)$/
if apop($1,$2)
	@state = 'trans'
	emails
	send("+OK #{@user.username} is most welcome here")
else
	@failed += 1
	if @failed > 2
		send("-ERR you're out!", true)
      else
	  send("-ERR sorry, no mailbox for #{$1} here")
      end
end
  else
    send("-ERR unknown command")
  			end
end

#dele(msgid) ⇒ Object 



264
265
266
267
268
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 264

def dele(msgid)
	msgid = msgid.to_i
	return false if msgid > @emails.length
	@emails[msgid-1].marked = true
end

#emails ⇒ Object 



230
231
232
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 230

def emails
   @emails = @emailstore.emails_by_userid(@user.id)
end

#list(msgid = nil) ⇒ Object 



244
245
246
247
248
249
250
251
252
253
254
255
256
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 244

def list(msgid = nil)
	msgid = msgid.to_i if msgid
	if msgid
		return false if msgid > @emails.length or @emails[msgid-1].marked
		return [ [msgid, @emails[msgid].body.length] ]
	else
		msgs = []
		@emails.each_with_index do |e,i|
			msgs << [ i + 1, e.body.length ]
		end
		msgs
	end
end

#pass(password) ⇒ Object 



224
225
226
227
228
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 224

def pass(password)
	return false unless @user
	return false unless @user.password == password
	true
end

#post_init ⇒ Object 



21
22
23
24
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 21

def post_init
  puts ">> +OK POP3 server ready #{@apop_challenge}" if @debug
  send_data("+OK POP3 server ready #{@apop_challenge}\r\n")
end

#process_line(line) ⇒ Object 



47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 47

def process_line(line)
	case @state
	when 'auth'
     auth_state(line)
	when 'trans'
     trans_state(line)
	when 'update'
     update_state(line)
   else
 		send("-ERR unknown command")
	end
end

#quit ⇒ Object 



276
277
278
279
280
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 276

def quit
   @emails.find_all {|e| e.marked}.each do |email|
     @emailstore.delete_email(email)
   end
end

#receive_data(data) ⇒ Object 



26
27
28
29
30
31
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 26

def receive_data(data)
  puts ">> #{data}" if @debug
  data.split(/[\r\n]+/).each do |line|
    process_line(line)
  end
end

#retr(msgid) ⇒ Object 



258
259
260
261
262
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 258

def retr(msgid)
	msgid = msgid.to_i
	return false if msgid > @emails.length or @emails[msgid-1].marked == 'true'
	@emails[msgid-1].body
end

#rset ⇒ Object 



270
271
272
273
274
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 270

def rset
	@emails.each do |e|
		e.marked = false
	end
end

#send(data, close = false) ⇒ Object 



33
34
35
36
37
38
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 33

def send(data, close=false)
  puts "<< #{data}" if @debug
  send_data("#{data}\r\n")
  puts "++ closing connection" if @debug and close
  close_connection(true) if close
end

#stat ⇒ Object 



234
235
236
237
238
239
240
241
242
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 234

def stat
	msgs = bytes = 0
	@emails.each do |e|
		next if e.marked == 'true'
		msgs += 1
		bytes += e.body.length
	end
	[msgs, bytes]
end

#trans_state(line) ⇒ Object 



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 110

def trans_state(line)
  			case line
  			when /^NOOP$/
send("+OK")
  			when /^STAT$/
msgs, bytes = stat
send("+OK #{msgs} #{bytes}")
  			when /^LIST$/
msgs, bytes = stat
msg = "+OK #{msgs} messages (#{bytes} octets)\r\n"
list.each do |num, bytes|
	msg += "#{num} #{bytes}\r\n"
end
msg += "."
send(msg)
  			when /^LIST (\d+)$/
msgs, bytes = stat
num, bytes = list($1)
if num
	send("+OK #{num} #{bytes}")
else
	send("-ERR no such message, only #{msgs} messages in maildrop")
end
  			when /^RETR (\d+)$/
msg = retr($1)
if msg
	msg = "+OK #{msg.length} octets\r\n" + msg + "\r\n."
else
	msg = "-ERR no such message"
end
send(msg)
  			when /^DELE (\d+)$/
if dele($1)
	send("+OK message #{$1} marked")
else
	send("-ERR message #{$1} already marked")
end
  			when /^RSET$/
rset
msgs, bytes = stat
send("+OK maildrop has #{msgs} messages (#{bytes} octets)")
  			when /^QUIT$/
@state = 'update'
quit
msgs, bytes = stat
if msgs > 0
	send("+OK dewey POP3 server signing off (#{msgs} messages left)", true)
else
	send("+OK dewey POP3 server signing off (maildrop empty)", true)
end
  			when /^TOP (\d+) (\d+)$/
lines = $2
msg = retr($1)
unless msg
	send("-ERR no such message")
    else
		cnt = nil
		final = ""
		msg.split(/\n/).each do |l|
			final += l+"\n"
			if cnt
				cnt += 1
				break if cnt > lines
			end
			if l !~ /\w/
				cnt = 0
			end
		end
		send("+OK\r\n"+final+"\r\n.")
    end
  			when /^UIDL$/
msgid = 0
msg = ''
@emails.each do |e|
	msgid += 1
	next if e.marked
	msg += "#{msgid} #{Digest::MD5.new.update(e.body).hexdigest}\r\n"
end
send("+OK\r\n#{msg}.")
  when /^UIDL (\d+)$/
    mid = $1
msgid = 0
    msg = ''
@emails.each do |e|
	msgid += 1
	next if e.marked
      if mid == msgid
        msg += "#{msgid} #{Digest::MD5.new.update(e.body).hexdigest}\r\n"
        last
      end
end
    if msg.length > 0
      send("+OK\r\n#{msg}.")
    else
      send("-ERR no such message, only #{msgid} messages in maildrop")
    end
  else
    send("-ERR unknown command")
  			end
end

#unbind(reason = nil) ⇒ Object 



40
41
42
43
44
45
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 40

def unbind(reason=nil)
  @emails.find_all {|e| e.marked}.each do |email|
    @emailstore.delete_email(email)
    puts "deleted #{email.id}" if @debug
  end
end

#update_state(line) ⇒ Object 



211
212
213
214
215
216
217
218
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 211

def update_state(line)
  			case line
  			when /^QUIT$/
send("+OK dewey POP3 server signing off", true)
  else
    send("-ERR unknown command")
  			end
end

#user(username) ⇒ Object 



220
221
222
 
# File 'lib/eventmachine/email_server/pop3_server.rb', line 220

def user(username)
	@user = @userstore.user_by_username(username)
end