summaryrefslogtreecommitdiff
path: root/lib/feed2imap/maildir.rb
blob: 68d591f3346e1060a974328a1f50b9a7e56969c4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
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
109
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
=begin
Feed2Imap - RSS/Atom Aggregator uploading to an IMAP Server, or local Maildir
Copyright (c) 2009 Andreas Rottmann

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
=end

require 'uri'
require 'fileutils'
require 'fcntl'
require 'mail'
require 'socket'

class MaildirAccount
  MYHOSTNAME = Socket.gethostname

  @@seq_num = 0

  attr_reader :uri

  def putmail(folder, mail, date = Time::now)
    store_message(folder_dir(folder), date, nil) do |f|
      f.puts(mail)
    end
  end

  def updatemail(folder, mail, idx, date = Time::now, reupload_if_updated = true)
    dir = folder_dir(folder)
    guarantee_maildir(dir)
    mail_files = find_mails(dir, idx)
    flags = nil
    if mail_files.length > 0
      # get the info from the first result and delete everything
      info = maildir_file_info(mail_files[0])
      mail_files.each { |f| File.delete(File.join(dir, f)) }
    elsif not reupload_if_updated
      # mail not present, and we don't want to re-upload it
      return
    end
    store_message(dir, date, info) { |f| f.puts(mail) }
  end

  def to_s
    uri.to_s
  end

  def cleanup(folder, dryrun = false)
    dir = folder_dir(folder)
    puts "-- Considering #{dir}:"
    guarantee_maildir(dir)

    del_count = 0
    recent_time = Time.now() - (3 * 24 * 60 * 60) # 3 days
    Dir[File.join(dir, 'cur', '*')].each do |fn|
      flags = maildir_file_info_flags(fn)
      # don't consider not-seen, flagged, or recent messages
      mtime = File.mtime(fn)
      next if (not flags.index('S') or
               flags.index('F') or
               mtime > recent_time)
      mail = Mail.read(fn)
      subject = mail.subject
      if dryrun
        puts "To remove: #{subject} #{mtime}"
      else
        puts "Removing: #{subject} #{mtime}"
        File.delete(fn)
      end
      del_count += 1
    end
    puts "-- Deleted #{del_count} messages"
    return del_count
  end

  private

  def folder_dir(folder)
    return File.join('/', folder)
  end

  def store_message(dir, date, info, &block)

    guarantee_maildir(dir)

    stored = false
    Dir.chdir(dir) do |d|
      timer = 30
      fd = nil
      while timer >= 0
        new_fn = new_maildir_basefn(date)
        tmp_path = File.join(dir, 'tmp', new_fn)
        new_path = File.join(dir, 'new', new_fn)
        begin
          fd = IO::sysopen(tmp_path,
                           Fcntl::O_WRONLY | Fcntl::O_EXCL | Fcntl::O_CREAT)
          break
        rescue Errno::EEXIST
          sleep 2
          timer -= 2
          next
        end
      end

      if fd
        begin
          f = IO.open(fd)
          # provide a writable interface for the caller
          yield f
          f.fsync
          File.link tmp_path, new_path
          stored = true
        ensure
          File.unlink tmp_path if File.exists? tmp_path
        end
      end

      if stored and info
        cur_path = File.join(dir, 'cur', new_fn + ':' + info)
        File.rename(new_path, cur_path)
      end
    end # Dir.chdir

    return stored
  end

  def find_mails(dir, idx)
    dir_paths = []
    ['cur', 'new'].each do |d|
      subdir = File.join(dir, d)
      raise "#{subdir} not a directory" unless File.directory? subdir
      Dir[File.join(subdir, '*')].each do |fn|
        mail = Mail.read(fn)
        cache_index = mail.message_id
        if cache_index
          if idx.start_with? '<' and idx.end_with? '>'
            cache_index = "<#{cache_index}>"
          end
          if cache_index == idx
            dir_paths.push(File.join(d, File.basename(fn)))
          end
        end
      end
    end
    return dir_paths
  end

  def guarantee_maildir(dir)
    # Ensure maildir-folderness
    ['new', 'cur', 'tmp'].each do |d|
      FileUtils.mkdir_p(File.join(dir, d))
    end
  end

  def maildir_file_info(file)
    basename = File.basename(file)
    colon = basename.rindex(':')

    return (colon and basename[colon + 1 .. -1])
  end

  # Re-written and no longer shamelessly taken from
  # http://gitorious.org/sup/mainline/blobs/master/lib/sup/maildir.rb
  def new_maildir_basefn(date)
    fn = "#{date.to_i.to_s}.#{@@seq_num.to_s}.#{MYHOSTNAME}"
    @@seq_num += 1
    fn
  end

  def maildir_file_info_flags(fn)
    parts = fn.split(',')
    if parts.size == 1
      ''
    else
      parts.last
    end
  end

end