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require "gdbm"
require "fileutils"
require "tempfile"
require "time"
module Puke
class << self
attr_reader :datadir, :listen_address, :listen_port, :secret
def verbose?() @verbose end
end
module_function
def setup(verbose: false, datadir:, listen:, secret: nil)
@verbose = verbose
@datadir = datadir
l = listen.split(":")
@listen_address = l[0]
@listen_port = Integer(l[1])
@secret = secret
FileUtils.mkdir_p(@datadir)
FileUtils.mkdir_p(File.join(@datadir, "tmp"))
gpath = File.join(@datadir, "puke.gdbm")
@gdbm = GDBM.new(gpath, 0644, GDBM::WRCREAT)
end
def close
@gdbm.close
@gdbm = :closed
end
def tmpdir
File.join(datadir, "tmp")
end
# Returns the largest tid ever, or -1 if no messages are stored
def last_tid
@gdbm.fetch("last-tid", "-1").to_i
end
def thread(tid)
@gdbm.fetch("t#{tid}").split("\0")
end
def tid_for(mid)
Puke.metadata(mid)&.fetch(:tid)
end
def metadata(mid)
data = @gdbm["m#{mid}"] or return
tid, subject, date = data.split("\0")
{ mid: mid, tid: tid.to_i, subject: subject, date: Time.rfc2822(date) }
end
def open(mid, &blk)
File.open(File.join(datadir, mangle_mid(mid) + ".mbox"), &blk)
end
CreateMutex = Thread::Mutex.new
def create0(file)
mid, tid, subject, date = parse_file(file)
fpath = File.join(datadir, mangle_mid(mid) + ".mbox")
# A mutex is used here in case two threads try to store the same message
CreateMutex.synchronize {
# File.exist?(fpath) is needed here because of the mangling...
if existing = Puke.metadata(mid) or File.exist?(fpath)
if existing && (!tid || tid == existing[:tid]) &&
subject == existing[:subject] && date == existing[:date]
raise "duplicate message"
else
# TODO: Oops, how to deal with this case?
raise "duplicate Message-ID; subject=#{existing[:subject]} and " \
"subject=#{subject}"
end
end
unless tid
tid = last_tid + 1
@gdbm["last-tid"] = tid.to_s
@gdbm["t#{tid}"] = mid
else
# TODO: Hmph
l = Puke.thread(tid).map { |m| Puke.metadata(m) } << {
mid: mid, date: date, subject: subject }
l.sort_by! { |i| [i[:date], i[:subject]] }
@gdbm["t#{tid}"] = l.map { |i| i[:mid] }.join("\0")
end
@gdbm["m#{mid}"] = [tid, subject, date.rfc2822].join("\0")
File.link(file, fpath)
}
mid
end
def create(io, is_raw = false)
if is_raw
Tempfile.create("unnamed", tmpdir) { |t|
t.binmode
# Is this really correct??
t << "From mboxrd Thu Jan 1 00:00:00 1970\n"
x = nil
io.each_line do |line|
x = line[-1] == "\n"
line.gsub!(/\A(>*)From /, "\\1>From ")
line.gsub!(/\r\n\z/, "\n")
t << line
end
if x
t << "\n\n"
else
t << "\n"
end
t.rewind
create0(t)
}
else
# io is already in mboxrd format and may contain multiple messages
mids = []
begin
t = nil
io.each_line do |line|
# Beginning of a new message
if line.start_with?("From ")
if t
t.rewind
mids << create0(t)
t.close!
end
t = Tempfile.open("unnamed", tmpdir)
t.binmode
end
raise "invalid mbox header" unless t
t << line
end
if t
t.rewind
mids << create0(t)
t.close!
end
ensure
t and not t.closed? and t.close!
end
mids
end
end
def parse_file(io)
# We can assume the input is in mboxrd format
mid = nil
parents = []
subject = nil
date = nil
state = nil
io.each_line do |line|
# We use \0 as a delimiter so don't allow that
line.delete("\0")
if line == "\n"
# End of headers
break
elsif line.start_with?(" ") || line.start_with?("\t")
case state
when nil
# This is invalid and must not happen...
when :subject
subject << line.chomp
when :references
parents.concat(line.scan(/(<[^<>]+>)/).flatten)
end
else
h, c = line.split(":", 2)
h.downcase!
c or next # Hmm, invalid header?
c.strip!
case h
when "date"
date = c
state = nil
when "message-id"
next if mid
mid = c
state = nil
when "in-reply-to"
parents.unshift(c)
state = nil
when "references"
parents.concat(c.scan(/(<[^<>]+>)/).flatten)
state = :references
when "subject"
next if subject
subject = c
state = :subject
else
state = nil
end
end
end
mid or raise "Message-ID not found"
# Strip < and >
/\A<(?<imid>.+@.+)>\z/ =~ mid and mid.ascii_only? or
raise "Message-ID is invalid"
mid = imid
subject or raise "Subject not found"
date or raise "Date not found"
date = Time.rfc2822(date)
# TODO: Implement saner threading algorithm
tid = nil
parents.each do |pmid|
# Strip < and >
/\A<(?<ipmid>.+@.+)>\z/ =~ pmid and pmid.ascii_only? or next
pmid = ipmid
item = @gdbm["m#{pmid}"] or next
tid, = item.split("\0")
break
end
[mid, tid, subject, date]
end
def mangle_mid(mid)
mid.tr("/", "_")
end
end
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