/usr/lib/ruby/1.8/rfilter/delivery_agent.rb is in librfilter-ruby1.8 0.12-2.
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# Copyright (C) 2001, 2002, 2003 Matt Armstrong. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior
# written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
require 'rmail/message'
require 'rmail/parser'
require 'rfilter/deliver'
require 'rfilter/mta'
module RFilter
# The RFilter::DeliveryAgent class allows flexible delivery of
# a mail message to a mailbox. It is designed to make mail
# filtering scripts easy to write, by allowing the filter author to
# concentrate on the filter logic and not the particulars of the
# message or folder format.
#
# It is designed primarily to work as an DeliveryAgent (local
# delivery agent) for an SMTP server. It should work well as the
# basis for a script run from a .forward or .qmail file.
class DeliveryAgent
include RFilter::Deliver
# A DeliveryComplete exception is one that indicates that
# RFilter::DeliveryAgent's delivery process is now complete and. The
# DeliveryComplete exception is never thrown itself, but its
# various subclasses are.
class DeliveryComplete < StandardError
# Create a new DeliveryComplete exception with a given +message+.
def initialize(message)
super
end
end
# This exception is raised when there is a problem logging.
class LoggingError < StandardError
attr_reader :original_exception
def initialize(message, original_exception = nil)
super(message)
@original_exception = original_exception
end
end
# Raised when the command run by #pipe or #filter fails.
class DeliveryCommandFailure < DeliveryComplete
# This is the exit status of the pipe command.
attr_reader :status
def initialize(message, status)
super(message)
@status = status
end
end
# Raised upon delivery success, unless the +continue+ flag of the
# RFilter::DeliveryAgent delivery method was set to true.
class DeliverySuccess < DeliveryComplete
def initialize(message)
super
end
end
# Raised by RFilter::DeliveryAgent#reject.
class DeliveryReject < DeliveryComplete
def initialize(message)
super
end
end
# Raised by RFilter::DeliveryAgent#defer.
class DeliveryDefer < DeliveryComplete
def initialize(message)
super
end
end
# Create a new RFilter::DeliveryAgent object.
#
# +input+ may be a RMail::Message object (in which case,
# it is used directly). Otherwise, it is passed to
# RMail::Message.new and used to create a new
# RMail::Message object.
#
# +log+ may be nil (to disable logging completely) or a file name
# to which log messages will be appended.
def initialize(input, logfile)
@logfile =
if logfile.nil?
nil
else
File.open(logfile, File::CREAT|File::APPEND|File::WRONLY, 0600)
end
@message = if input.is_a?(RMail::Message)
input
else
RMail::Parser.new.parse(input)
end
@logging_level = 2
end
# Save this message to mail folder. +folder+ must be the file
# name of the mailbox. If +folder+ ends in a slash (/) then the
# mailbox will be considered to be in Maildir format, otherwise it
# will be a Unix mbox folder.
#
# If +continue+ is false (the default), a
# RFilter::DeliveryAgent::DeliverySuccess exception is raised upon
# successful delivery. Otherwise, the method simply returns upon
# successful delivery.
#
# Upon failure, the function raises an exception as determined by
# RFilter::Deliver.deliver_mbox or RFilter::Deliver.deliver_maildir.
#
# See also: RFilter::Deliver.deliver_mbox and
# RFilter::Deliver.deliver_maildir.
def save(folder, continue = false)
log(2, "Action: save to #{folder.inspect}")
retval = if folder =~ %r{(.*[^/])/$}
deliver_maildir($1, @message)
else
deliver_mbox(folder, @message)
end
raise DeliverySuccess, "saved to mbox #{folder.inspect}" unless continue
retval
end
# Reject this message. Logs the +reason+ for the rejection and
# raises a RFilter::DeliveryAgent::DeliveryReject exception.
def reject(reason = nil)
log(2, "Action: reject: " + reason.to_s)
raise DeliveryReject.new(reason.to_s)
end
# Reject this message for now, but request that it be queued for
# re-delivery in the future. Logs the +reason+ for the rejection
# and raises a RFilter::DeliveryAgent::DeliveryDefer exception.
def defer(reason = nil)
log(2, "Action: defer: " + reason.to_s)
raise DeliveryDefer.new(reason.to_s)
end
# Pipe this message to a command. +command+ must be a string
# specifying a command to pipe the message to.
#
# If +continue+ is false, then a successful delivery to the pipe
# will raise a RFilter::DeliveryAgent::DeliverySuccess exception.
# If +continue+ is true, then a successful delivery will simply
# return. Regardless of +continue+, a failure to deliver to the
# pipe will raise a RFilter::DeliveryAgent::DeliveryCommandFailure
# exception.
#
# See also: RFilter::Deliver.deliver_pipe.
def pipe(command, continue = false)
log(2, "Action: pipe to #{command.inspect}")
deliver_pipe(command, @message)
if $? != 0
m = "pipe failed for command #{command.inspect}"
log(1, "Error: " + m)
raise DeliveryCommandFailure.new(m, $?)
end
unless continue
raise DeliverySuccess.new("pipe to #{command.inspect}")
end
end
# Filter this message through a command. +command+ must be a
# string or an array of strings specifying a command to filter the
# message through (it is passed to the Kernel::exec method).
#
# If the command does not exit with a status of 0, a
# RFilter::DeliveryAgent::DeliveryCommandFailure exception is
# raised and the current message is not replaced.
#
# See also: RFilter::Deliver.deliver_filter.
def filter(*command)
log(2, "Action: filter through #{command.inspect}")
msg = nil
status = deliver_filter(@message, *command) { |io|
msg = RMail::Parser.new.parse(io)
}
if status != 0
m = format("filter failed for command %s (status %s)",
command.inspect, status.inspect)
log(1, "Error: " + m)
raise DeliveryCommandFailure.new(m, status)
end
@message = msg
end
# Log a string to the log. If the current log is nil or +level+
# is greater than the current logging level, then the string will
# not be logged.
#
# See also #logging_level, #logging_level=
def log(level, str)
if level <= 0 and @logfile.nil?
raise LoggingError, "failed to log high priority message: #{str}"
end
return if @logfile.nil? or level > @logging_level
begin
@logfile.flock(File::LOCK_EX)
@logfile.print(Time.now.strftime("%Y/%m/%d %H:%M:%S "))
@logfile.print(sprintf("%05d: ", Process.pid))
@logfile.puts(str)
@logfile.flush
@logfile.flock(File::LOCK_UN)
rescue
# FIXME: this isn't tested
raise LoggingError.new("failed to log message: #{str}", $!)
end
end
# Return the current logging level.
#
# See also: #logging_level=, #log
def logging_level
@logging_level
end
# Set the current logging level. The +level+ must be a number no
# less than one.
#
# See also: #logging_level, #log
def logging_level=(level)
level = Integer(level)
raise ArgumentError, "invalid logging level value #{level}" if level < 1
@logging_level = level
end
# Return the RMail::Message object associated with this
# RFilter::DeliveryAgent.
#
# See also: #header, #body
def message
@message
end
# Sets the message (which should be a RMail::Message object) that
# we're delivering.
def message=(message)
@message = message
end
# Return the header of the message as a RMail::Header object.
# This is short hand for lda.message.header.
#
# See also: #message, #body
def header
@message.header
end
# Return the body of the message as an array of strings. This is
# short hand for lda.message.body.
#
# See also: #message, #header
def body
@message.body
end
class << self
# Takes the same input as #new, but passes the created
# RFilter::DeliveryAgent to the supplied block. The idea
# is that the entire delivery script is contained within the
# block.
#
# This function tries to log exceptions that aren't
# DeliveryComplete exceptions to the lda's log. If it can log
# them, it defers the delivery. But if it can't, it re-raises
# the exception so the caller can more properly deal with the
# exception.
#
# Expected use:
#
# begin
# RFilter::DeliveryAgent.process(stdin, "my-log-file") { |lda|
# # ...code uses lda to deliver mail...
# }
# rescue RFilter::DeliveryAgent::DeliveryComplete => exception
# exit(RFilter::DeliveryAgent.exitcode(exception))
# rescue Exception
# ... perhaps log the exception to a hard coded file ...
# exit(RFilter::MTA::EX_TEMPFAIL)
# end
def process(input, logfile)
begin
lda = RFilter::DeliveryAgent.new(input, logfile)
yield lda
lda.defer("finished without a final delivery")
rescue Exception => exception
if exception.class <= DeliveryComplete
raise exception
else
begin
lda.log(0, "uncaught exception: " + exception.inspect)
lda.log(0, "uncaught exception backtrace:\n " +
exception.backtrace.join("\n "))
lda.defer("uncaught exception")
rescue Exception
if $!.class <= DeliveryComplete
# The lda.defer above will generate this, just re-raise
# the delivery status exception.
raise
else
# Any errors logging in the uncaught exception and we
# just re-raise the original exception
raise exception
end
end
end
end
end
# This function expects the +exception+ argument to be a
# RFilter::DeliveryAgent::DeliveryComplete subclass. The function
# will return the appropriate exitcode that the process should
# exit with.
def exitcode(exception)
case exception
when DeliverySuccess
RFilter::MTA::EXITCODE_DELIVERED
when DeliveryReject
RFilter::MTA::EXITCODE_REJECT
when DeliveryComplete
RFilter::MTA::EXITCODE_DEFER
else
raise ArgumentError,
"argument is not a DeliveryComplete exception: " +
"#{exception.inspect} (#{exception.class})"
end
end
end
end
end
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