X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=lib%2Fsup%2Fimap.rb;h=057027b0ba233b79cf1b217d1a0ab534b858dff9;hb=385c5e85852e1a2c81ce3672e90fa1d021f7bd3f;hp=41c3c0f401b1b913638e034ef233ab7f0d37587b;hpb=1ffc0add02bfbecc663608873aa6d421c65a2fc1;p=sup

diff --git a/lib/sup/imap.rb b/lib/sup/imap.rb
index 41c3c0f..057027b 100644
--- a/lib/sup/imap.rb
+++ b/lib/sup/imap.rb
@@ -1,107 +1,318 @@
 require 'uri'
 require 'net/imap'
 require 'stringio'
+require 'time'
+require 'rmail'
+require 'cgi'
 
+## fucking imap fucking sucks. what the FUCK kind of committee of
+## dunces designed this shit.
+##
+## imap talks about 'unique ids' for messages, to be used for
+## cross-session identification. great---just what sup needs! except
+## it turns out the uids can be invalidated every time the
+## 'uidvalidity' value changes on the server, and 'uidvalidity' can
+## change without restriction. it can change any time you log in. it
+## can change EVERY time you log in. of course the imap spec "strongly
+## recommends" that it never change, but there's nothing to stop
+## people from just setting it to the current timestamp, and in fact
+## that's exactly what the one imap server i have at my disposal
+## does. thus the so-called uids are absolutely useless and imap
+## provides no cross-session way of uniquely identifying a
+## message. but thanks for the "strong recommendation", guys!
+##
+## so right now i'm using the 'internal date' and the size of each
+## message to uniquely identify it, and i scan over the entire mailbox
+## each time i open it to map those things to message ids. that can be
+## slow for large mailboxes, and we'll just have to hope that there
+## are no collisions. ho ho! a perfectly reasonable solution!
+##
+## and here's another thing. check out RFC2060 2.2.2 paragraph 5:
+##
+##   A client MUST be prepared to accept any server response at all times.
+##   This includes server data that was not requested.
+##
+## yeah. that totally makes a lot of sense. and once again, the idiocy
+## of the spec actually happens in practice. you'll request flags for
+## one message, and get it interspersed with a random bunch of flags
+## for some other messages, including a different set of flags for the
+## same message! totally ok by the imap spec. totally retarded by any
+## other metric.
+##
+## fuck you, imap committee. you managed to design something nearly as
+## shitty as mbox but goddamn THIRTY YEARS LATER.
 module Redwood
 
 class IMAP < Source
-  attr_reader :labels
-  
-  def initialize uri, username, password, last_uid=nil, usual=true, archived=false, id=nil
+  SCAN_INTERVAL = 60 # seconds
+
+  ## upon these errors we'll try to rereconnect a few times
+  RECOVERABLE_ERRORS = [ Errno::EPIPE, Errno::ETIMEDOUT, OpenSSL::SSL::SSLError ]
+
+  attr_accessor :username, :password
+  yaml_properties :uri, :username, :password, :cur_offset, :usual,
+                  :archived, :id, :labels
+
+  def initialize uri, username, password, last_idate=nil, usual=true, archived=false, id=nil, labels=[]
     raise ArgumentError, "username and password must be specified" unless username && password
+    raise ArgumentError, "not an imap uri" unless uri =~ %r!imaps?://!
 
-    super uri, last_uid, usual, archived, id
+    super uri, last_idate, usual, archived, id
 
     @parsed_uri = URI(uri)
     @username = username
     @password = password
     @imap = nil
-    @labels = [:unread]
-    @labels << mailbox.intern unless mailbox =~ /inbox/i || mailbox.empty?
-    @labels << :inbox unless archived?
+    @imap_state = {}
+    @ids = []
+    @last_scan = nil
+    @labels = ((labels || []) - LabelManager::RESERVED_LABELS).uniq.freeze
+    @say_id = nil
+    @mutex = Mutex.new
+  end
 
-    connect
+  def self.suggest_labels_for path
+    path =~ /([^\/]*inbox[^\/]*)/i ? [$1.downcase.intern] : []
   end
 
+  def host; @parsed_uri.host; end
+  def port; @parsed_uri.port || (ssl? ? 993 : 143); end
+  def mailbox
+    x = @parsed_uri.path[1..-1]
+    (x.nil? || x.empty?) ? 'INBOX' : CGI.unescape(x)
+  end
+  def ssl?; @parsed_uri.scheme == 'imaps' end
+
+  def check; end # do nothing because anything we do will be too slow,
+                 # and we'll catch the errors later.
+
+  ## is this necessary? TODO: remove maybe
+  def == o; o.is_a?(IMAP) && o.uri == self.uri && o.username == self.username; end
+
+  def load_header id
+    MBox::read_header StringIO.new(raw_header(id))
+  end
+
+  def load_message id
+    RMail::Parser.read raw_message(id)
+  end
+  
+  def each_raw_message_line id
+    StringIO.new(raw_message(id)).each { |l| yield l }
+  end
+
+  def raw_header id
+    unsynchronized_scan_mailbox
+    header, flags = get_imap_fields id, 'RFC822.HEADER'
+    header.gsub(/\r\n/, "\n")
+  end
+  synchronized :raw_header
+
+  def raw_message id
+    unsynchronized_scan_mailbox
+    get_imap_fields(id, 'RFC822').first.gsub(/\r\n/, "\n")
+  end
+  synchronized :raw_message
+
   def connect
-    return false if broken?
-    return true if @imap
-    Redwood::log "connecting to #{@parsed_uri.host} port #{ssl? ? 993 : 143}, ssl=#{ssl?} ..."
+    return if @imap
+    safely { } # do nothing!
+  end
+  synchronized :connect
 
-    ## ok, this is FUCKING ANNOYING.
-    ##
-    ## what imap.rb likes to do is, if an exception occurs, catch it
-    ## and re-raise it on the calling thread. seems reasonable. but
-    ## what that REALLY means is that the only way to reasonably
-    ## initialize imap is in its own thread, because otherwise, you
-    ## will never be able to catch the exception it raises on the
-    ## calling thread, and the backtrace will not make any sense at
-    ## all, and you will waste HOURS of your life on this fucking
-    ## problem.
-    ##
-    ## FUCK!!!!!!!!!
+  def scan_mailbox
+    return if @last_scan && (Time.now - @last_scan) < SCAN_INTERVAL
+    last_id = safely do
+      @imap.examine mailbox
+      @imap.responses["EXISTS"].last
+    end
+    @last_scan = Time.now
+
+    return if last_id == @ids.length
+
+    range = (@ids.length + 1) .. last_id
+    Redwood::log "fetching IMAP headers #{range}"
+    fetch(range, ['RFC822.SIZE', 'INTERNALDATE', 'FLAGS']).each do |v|
+      id = make_id v
+      @ids << id
+      @imap_state[id] = { :id => v.seqno, :flags => v.attr["FLAGS"] }
+    end
+    Redwood::log "done fetching IMAP headers"
+  end
+  synchronized :scan_mailbox
+
+  def each
+    return unless start_offset
+
+    ids = 
+      @mutex.synchronize do
+        unsynchronized_scan_mailbox
+        @ids
+      end
+
+    start = ids.index(cur_offset || start_offset) or raise OutOfSyncSourceError, "Unknown message id #{cur_offset || start_offset}."
+
+    start.upto(ids.length - 1) do |i|
+      id = ids[i]
+      state = @mutex.synchronize { @imap_state[id] } or next
+      self.cur_offset = id 
+      labels = { :Flagged => :starred,
+                 :Deleted => :deleted
+               }.inject(@labels) do |cur, (imap, sup)|
+        cur + (state[:flags].include?(imap) ? [sup] : [])
+      end
+
+      labels += [:unread] unless state[:flags].include?(:Seen)
+
+      yield id, labels
+    end
+  end
+
+  def start_offset
+    unsynchronized_scan_mailbox
+    @ids.first
+  end
+  synchronized :start_offset
+
+  def end_offset
+    unsynchronized_scan_mailbox
+    @ids.last
+  end
+  synchronized :end_offset
+
+  def pct_done; 100.0 * (@ids.index(cur_offset) || 0).to_f / (@ids.length - 1).to_f; end
+
+private
+
+  def fetch ids, fields
+    results = safely { @imap.fetch ids, fields }
+    good_results = 
+      if ids.respond_to? :member?
+        results.find_all { |r| ids.member?(r.seqno) && fields.all? { |f| r.attr.member?(f) } }
+      else
+        results.find_all { |r| ids == r.seqno && fields.all? { |f| r.attr.member?(f) } }
+      end
+
+    if good_results.empty?
+      raise FatalSourceError, "no IMAP response for #{ids} containing all fields #{fields.join(', ')} (got #{results.size} results)"
+    elsif good_results.size < results.size
+      Redwood::log "Your IMAP server sucks. It sent #{results.size} results for a request for #{good_results.size} messages. What are you using, Binc?"
+    end
+
+    good_results
+  end
+
+  def unsafe_connect
+    say "Connecting to IMAP server #{host}:#{port}..."
+
+    ## apparently imap.rb does a lot of threaded stuff internally and
+    ## if an exception occurs, it will catch it and re-raise it on the
+    ## calling thread. but i can't seem to catch that exception, so
+    ## i've resorted to initializing it in its own thread. surely
+    ## there's a better way.
+    exception = nil
     ::Thread.new do
       begin
         #raise Net::IMAP::ByeResponseError, "simulated imap failure"
-        @imap = Net::IMAP.new @parsed_uri.host, ssl? ? 993 : 143, ssl?
-        @imap.authenticate 'LOGIN', @username, @password
-        @imap.examine mailbox
-        Redwood::log "successfully connected to #{@parsed_uri}, mailbox #{mailbox}"
+        @imap = Net::IMAP.new host, port, ssl?
+        say "Logging in..."
+
+        ## although RFC1730 claims that "If an AUTHENTICATE command
+        ## fails with a NO response, the client may try another", in
+        ## practice it seems like they can also send a BAD response.
+        begin
+          raise Net::IMAP::NoResponseError unless @imap.capability().member? "AUTH=CRAM-MD5"
+          @imap.authenticate 'CRAM-MD5', @username, @password
+        rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
+          Redwood::log "CRAM-MD5 authentication failed: #{e.class}. Trying LOGIN auth..."
+          begin
+            raise Net::IMAP::NoResponseError unless @imap.capability().member? "AUTH=LOGIN"
+            @imap.authenticate 'LOGIN', @username, @password
+          rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
+            Redwood::log "LOGIN authentication failed: #{e.class}. Trying plain-text LOGIN..."
+            @imap.login @username, @password
+          end
+        end
+        say "Successfully connected to #{@parsed_uri}."
       rescue Exception => e
-        self.broken_msg = e.message.chomp # fucking chomp! fuck!!!
-        @imap = nil
-        Redwood::log "error connecting to IMAP server: #{self.broken_msg}"
+        exception = e
+      ensure
+        shutup
       end
     end.join
 
-    !!@imap
+    raise exception if exception
   end
-  private :connect
 
-  def mailbox; @parsed_uri.path[1..-1] end ##XXXX TODO handle nil
-  def ssl?; @parsed_uri.scheme == 'imaps' end
-
-  def load_header uid=nil
-    MBox::read_header StringIO.new(raw_header(uid))
+  def say s
+    @say_id = BufferManager.say s, @say_id if BufferManager.instantiated?
+    Redwood::log s
   end
 
-  def load_message uid
-    RMail::Parser.read raw_full_message(uid)
+  def shutup
+    BufferManager.clear @say_id if BufferManager.instantiated?
+    @say_id = nil
   end
 
-  ## load the full header text
-  def raw_header uid
-    connect or return broken_msg
-    begin
-      connect or return broken_msg
-    rescue Exception => e
-      raise "wtf: #{e.inspect}"
+  def make_id imap_stuff
+    # use 7 digits for the size. why 7? seems nice.
+    %w(RFC822.SIZE INTERNALDATE).each do |w|
+      raise FatalSourceError, "requested data not in IMAP response: #{w}" unless imap_stuff.attr[w]
     end
-    @imap.uid_fetch(uid, 'RFC822.HEADER')[0].attr['RFC822.HEADER'].gsub(/\r\n/, "\n")
+    
+    msize, mdate = imap_stuff.attr['RFC822.SIZE'] % 10000000, Time.parse(imap_stuff.attr["INTERNALDATE"])
+    sprintf("%d%07d", mdate.to_i, msize).to_i
   end
 
-  def raw_full_message uid
-    connect or return broken_msg
-    @imap.uid_fetch(uid, 'RFC822')[0].attr['RFC822'].gsub(/\r\n/, "\n")
+  def get_imap_fields id, *fields
+    raise OutOfSyncSourceError, "Unknown message id #{id}" unless @imap_state[id]
+
+    imap_id = @imap_state[id][:id]
+    result = fetch(imap_id, (fields + ['RFC822.SIZE', 'INTERNALDATE']).uniq).first
+    got_id = make_id result
+
+    ## I've turned off the following sanity check because Microsoft Exchange fails it.
+    ## Exchange actually reports two different INTERNALDATEs for the exact same message
+    ## when queried at different points in time.
+    ##
+    ##
+    ## RFC2060 defines the semantics of INTERNALDATE for messages that arrive
+    ## via SMTP for via various IMAP commands, but states that "All other
+    ## cases are implementation defined.". Great, thanks guys, yet another
+    ## useless field.
+    ## 
+    ## Of course no OTHER imap server I've encountered returns DIFFERENT values for
+    ## the SAME message. But it's Microsoft; what do you expect? If their programmers
+    ## were any good they'd be working at Google.
+
+    # raise OutOfSyncSourceError, "IMAP message mismatch: requested #{id}, got #{got_id}." unless got_id == id
+
+    fields.map { |f| result.attr[f] or raise FatalSourceError, "empty response from IMAP server: #{f}" }
   end
-  
-  def each
-    connect or return broken_msg
-    uids = @imap.uid_search ['UID', "#{cur_offset}:#{end_offset}"]
-    uids.each do |uid|
-      @last_uid = uid
-      @dirty = true
-      yield uid, labels
+
+  ## execute a block, connected if unconnected, re-connected up to 3
+  ## times if a recoverable error occurs, and properly dying if an
+  ## unrecoverable error occurs.
+  def safely
+    retries = 0
+    begin
+      begin
+        unsafe_connect unless @imap
+        yield
+      rescue *RECOVERABLE_ERRORS => e
+        if (retries += 1) <= 3
+          @imap = nil
+          Redwood::log "got #{e.class.name}: #{e.message.inspect}"
+          sleep 2
+          retry
+        end
+        raise
+      end
+    rescue SocketError, Net::IMAP::Error, SystemCallError, IOError, OpenSSL::SSL::SSLError => e
+      raise FatalSourceError, "While communicating with IMAP server (type #{e.class.name}): #{e.message.inspect}"
     end
   end
 
-  def start_offset; 1; end
-  def end_offset
-    connect or return start_offset
-    @imap.uid_search(['ALL']).last
-  end
 end
 
-Redwood::register_yaml(IMAP, %w(uri username password offset usual archived id))
-
 end