7 ## fucking imap fucking sucks. what the FUCK kind of committee of
8 ## dunces designed this shit.
10 ## imap talks about 'unique ids' for messages, to be used for
11 ## cross-session identification. great---just what sup needs! except
12 ## it turns out the uids can be invalidated every time the
13 ## 'uidvalidity' value changes on the server, and 'uidvalidity' can
14 ## change without restriction. it can change any time you log in. it
15 ## can change EVERY time you log in. of course the imap spec "strongly
16 ## recommends" that it never change, but there's nothing to stop
17 ## people from just setting it to the current timestamp, and in fact
18 ## that's exactly what the one imap server i have at my disposal
19 ## does. thus the so-called uids are absolutely useless and imap
20 ## provides no cross-session way of uniquely identifying a
21 ## message. but thanks for the "strong recommendation", guys!
23 ## so right now i'm using the 'internal date' and the size of each
24 ## message to uniquely identify it, and i scan over the entire mailbox
25 ## each time i open it to map those things to message ids. that can be
26 ## slow for large mailboxes, and we'll just have to hope that there
27 ## are no collisions. ho ho! a perfectly reasonable solution!
29 ## fuck you, imap committee. you managed to design something nearly as
30 ## shitty as mbox but goddamn THIRTY YEARS LATER.
34 SCAN_INTERVAL = 60 # seconds
36 ## upon these errors we'll try to rereconnect a few times
37 RECOVERABLE_ERRORS = [ Errno::EPIPE, Errno::ETIMEDOUT, OpenSSL::SSL::SSLError ]
39 attr_accessor :username, :password
41 def initialize uri, username, password, last_idate=nil, usual=true, archived=false, id=nil
42 raise ArgumentError, "username and password must be specified" unless username && password
43 raise ArgumentError, "not an imap uri" unless uri =~ %r!imaps?://!
45 super uri, last_idate, usual, archived, id
47 @parsed_uri = URI(uri)
55 @labels << mailbox.intern unless mailbox =~ /inbox/i
59 def host; @parsed_uri.host; end
60 def port; @parsed_uri.port || (ssl? ? 993 : 143); end
62 x = @parsed_uri.path[1..-1]
63 x.nil? || x.empty? ? 'INBOX' : x
65 def ssl?; @parsed_uri.scheme == 'imaps' end
70 unsynchronized_scan_mailbox
74 start = ids.index(cur_offset || start_offset) or raise OutOfSyncSourceError, "Unknown message id #{cur_offset || start_offset}."
77 ## is this necessary? TODO: remove maybe
78 def == o; o.is_a?(IMAP) && o.uri == self.uri && o.username == self.username; end
81 MBox::read_header StringIO.new(raw_header(id))
85 RMail::Parser.read raw_full_message(id)
89 unsynchronized_scan_mailbox
90 header, flags = get_imap_fields id, 'RFC822.HEADER', 'FLAGS'
91 header = header + "Status: RO\n" if flags.include? :Seen # fake an mbox-style read header # TODO: improve source-marked-as-read reporting system
92 header.gsub(/\r\n/, "\n")
94 synchronized :raw_header
96 def raw_full_message id
97 unsynchronized_scan_mailbox
98 get_imap_fields(id, 'RFC822').first.gsub(/\r\n/, "\n")
100 synchronized :raw_full_message
104 safely { } # do nothing!
106 synchronized :connect
109 return if @last_scan && (Time.now - @last_scan) < SCAN_INTERVAL
111 @imap.examine mailbox
112 @imap.responses["EXISTS"].last
114 @last_scan = Time.now
116 return if last_id == @ids.length
118 range = (@ids.length + 1) .. last_id
119 Redwood::log "fetching IMAP headers #{range}"
120 values = safely { @imap.fetch range, ['RFC822.SIZE', 'INTERNALDATE'] }
121 relevant_values = values.find_all { |v| range.include? v.seqno }
123 if relevant_values.size != values.size
124 Redwood::log "You IMAP server is buggy: it returned #{values.size} headers for a request for #{range.size}. What are you using, Binc?"
127 relevant_values.each do |v|
130 @imap_ids[id] = v.seqno
133 synchronized :scan_mailbox
137 @mutex.synchronize do
138 unsynchronized_scan_mailbox
142 start = ids.index(cur_offset || start_offset) or raise OutOfSyncSourceError, "Unknown message id #{cur_offset || start_offset}."
144 start.upto(ids.length - 1) do |i|
147 yield id, @labels.clone
152 unsynchronized_scan_mailbox
155 synchronized :start_offset
158 unsynchronized_scan_mailbox
161 synchronized :end_offset
163 def pct_done; 100.0 * (@ids.index(cur_offset) || 0).to_f / (@ids.length - 1).to_f; end
168 say "Connecting to IMAP server #{host}:#{port}..."
170 ## apparently imap.rb does a lot of threaded stuff internally and
171 ## if an exception occurs, it will catch it and re-raise it on the
172 ## calling thread. but i can't seem to catch that exception, so
173 ## i've resorted to initializing it in its own thread. surely
174 ## there's a better way.
178 #raise Net::IMAP::ByeResponseError, "simulated imap failure"
179 @imap = Net::IMAP.new host, port, ssl?
182 ## although RFC1730 claims that "If an AUTHENTICATE command
183 ## fails with a NO response, the client may try another", in
184 ## practice it seems like they can also send a BAD response.
186 @imap.authenticate 'CRAM-MD5', @username, @password
187 rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
188 Redwood::log "CRAM-MD5 authentication failed: #{e.class}. Trying LOGIN auth..."
190 @imap.authenticate 'LOGIN', @username, @password
191 rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
192 Redwood::log "LOGIN authentication failed: #{e.class}. Trying plain-text LOGIN..."
193 @imap.login @username, @password
196 say "Successfully connected to #{@parsed_uri}."
197 rescue Exception => e
204 raise exception if exception
208 @say_id = BufferManager.say s, @say_id if BufferManager.instantiated?
213 BufferManager.clear @say_id if BufferManager.instantiated?
217 def make_id imap_stuff
218 # use 7 digits for the size. why 7? seems nice.
219 %w(RFC822.SIZE INTERNALDATE).each do |w|
220 raise FatalSourceError, "requested data not in IMAP response: #{w}" unless imap_stuff.attr[w]
223 msize, mdate = imap_stuff.attr['RFC822.SIZE'] % 10000000, Time.parse(imap_stuff.attr["INTERNALDATE"])
224 sprintf("%d%07d", mdate.to_i, msize).to_i
227 def get_imap_fields id, *fields
228 imap_id = @imap_ids[id] or raise OutOfSyncSourceError, "Unknown message id #{id}"
231 results = safely { @imap.fetch imap_id, (fields + ['RFC822.SIZE', 'INTERNALDATE']).uniq }.first
232 got_id = make_id results
233 raise OutOfSyncSourceError, "IMAP message mismatch: requested #{id}, got #{got_id}." unless got_id == id
235 fields.map { |f| results.attr[f] or raise FatalSourceError, "empty response from IMAP server: #{f}" }
238 ## execute a block, connected if unconnected, re-connected up to 3
239 ## times if a recoverable error occurs, and properly dying if an
240 ## unrecoverable error occurs.
245 unsafe_connect unless @imap
247 rescue *RECOVERABLE_ERRORS => e
248 if (retries += 1) <= 3
250 Redwood::log "got #{e.class.name}: #{e.message.inspect}"
256 rescue SocketError, Net::IMAP::Error, SystemCallError, IOError, OpenSSL::SSL::SSLError => e
257 raise FatalSourceError, "While communicating with IMAP server (type #{e.class.name}): #{e.message.inspect}"
263 Redwood::register_yaml(IMAP, %w(uri username password cur_offset usual archived id))