#!/usr/bin/env python
#
# Copyright (C) 2009 W. Trevor King <wking@drexel.edu>
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""Provide and email interface to the distributed bugtracker Bugs
Everywhere. Recieves incoming email via procmail and allows users to
select actions with their subject lines. Subject lines follow the
format
[be-bug] command (options) (args)
With the body of the email being used as the final argument for the
commands "new" and "comment", and ignored otherwise. The options and
arguments are split on whitespace, so don't use whitespace inside a
single argument.
Eventually we'll commit after every message.
"""
import cStringIO as StringIO
import email
import email.utils
import libbe.cmdutil, libbe.utility
import os
import os.path
import send_pgp_mime
import sys
import time
SUBJECT_COMMENT = "[be-bug]"
HANDLER_ADDRESS = "BE Bugs <wking@thor.physics.drexel.edu>"
_THIS_DIR = os.path.abspath(os.path.dirname(__file__))
LOGPATH = os.path.join(_THIS_DIR, "be-handle-mail.log")
LOGFILE = None
BE_DIR = _THIS_DIR
ALLOWED_COMMANDS = ["new", "comment", "list", "show", "help"]
class InvalidEmail (ValueError):
def __init__(self, msg, info, message):
ValueError.__init__(self, message)
self.msg = msg
self.info = info
def response(self):
ret = 1
out_text = None
return (ret, out_text, self.stderr_msg(), self.info)
def stderr_msg(self):
err_text = [u"Invalid email (particular type unknown):\n",
unicode(self), u"",
send_pgp_mime.flatten(self.msg)]
return u"\n".join(err_text)
class InvalidSubject (InvalidEmail):
def stderr_msg(self):
err_text = u"\n".join([u"InvalidSubject:\n",
unicode(e), u"",
u"full subject was:",
e.msg["subject"]])
return err_text
class InvalidCommand (InvalidEmail):
def __init__(self, msg, info, command):
message = "Invalid command '%s'" % command
InvalidEmail.__init__(self, msg, info, message)
self.command = command
def stderr_msg(self):
err_text = u"\n".join([u"InvalidCommand:\n",
unicode(self), u"",
u"full subject was:",
self.msg["subject"]])
return err_text
def get_body_type(msg):
for part in msg.walk():
if part.is_multipart():
continue
return (part.get_payload(decode=1), part.get_content_type())
def run_message(msg_text):
"""
Attempt to execute the email given in the email string msg_text.
Raises assorted subclasses of InvalidEmail in the case of invalid
messages, otherwise return the exit code, stdout, and stderr
produced by the command, as well as a dictionary of information
gleaned from the email.
"""
encoding = libbe.encoding.get_encoding()
libbe.encoding.set_IO_stream_encodings(encoding)
p=email.Parser.Parser()
msg=p.parsestr(msg_text)
info = {}
info["encoding"] = encoding
author = send_pgp_mime.source_email(msg, return_realname=True)
info["author_name"] = author[0]
info["author_email"] = author[1]
info["author_addr"] = email.utils.formataddr(
(info["author_name"], info["author_email"]))
info["message-id"] = msg["message-id"]
if LOGFILE != None:
LOGFILE.write("handling %s\n" % (info["author_addr"]))
LOGFILE.write("\n%s\n\n" % msg_text)
if "subject" not in msg:
raise InvalidSubject(msg, info, "Email must contain a subject")
args = msg["subject"].split()
if len(args) < 1 or args[0] != SUBJECT_COMMENT:
raise InvalidSubject(
msg, info, "Subject must start with '%s '" % SUBJECT_COMMENT)
elif len(args) < 2:
raise InvalidCommand(msg, info, "") # don't accept blank commands
command = args[1]
info["command"] = command
if command not in ALLOWED_COMMANDS:
raise InvalidCommand(msg, command)
if len(args) > 2:
command_args = args[2:]
else:
command_args = []
if command in ["new", "comment"]:
body,type = get_body_type(msg)
if command == "new":
if "--reporter" not in args and "-r" not in args:
command_args = ["--reporter", author_addr] + command_args
body = body.strip().split("\n", 1)[0] # only take first line
elif command == "comment":
if "--author" not in args and "-a" not in args:
command_args = ["--author", author_addr] + command_args
if "--content-type" not in args and "-c" not in args:
command_args = ["--content-type", type] + command_args
if "--alt-id" not in args:
command_args = ["--alt-id", msg["message-id"]] + command_args
command_args.append(body)
info["command-args"] = command_args
# catch stdout and stderr
new_stdout = StringIO.StringIO()
new_stderr = StringIO.StringIO()
orig_stdout = sys.stdout
orig_stderr = sys.stderr
sys.stdout = new_stdout
sys.stderr = new_stderr
# run the command
err = None
os.chdir(BE_DIR)
try:
ret = libbe.cmdutil.execute(command, command_args,
manipulate_encodings=False)
except libbe.cmdutil.GetHelp:
print libbe.cmdutil.help(command)
except libbe.cmdutil.GetCompletions:
err = InvalidCommand(msg, info, "invalid option '--complete'")
except libbe.cmdutil.UsageError, e:
err = InvalidCommand(msg, info, e)
except libbe.cmdutil.UserError, e:
err = InvalidCommand(msg, info, e)
# restore stdout and stderr
sys.stdout.flush()
sys.stderr.flush()
sys.stdout = orig_stdout
sys.stderr = orig_stderr
out_text = new_stdout.getvalue()
err_text = new_stderr.getvalue()
if err != None:
raise err
return (ret, out_text, err_text, info)
def compose_response(ret, out_text, err_text, info):
assert "encoding" in info
if "author_addr" not in info:
return None
if "command" not in info:
info["command"] = u"-BLANK-"
if "command_args" not in info:
info["command_args"] = []
response_header = [u"From: %s" % HANDLER_ADDRESS,
u"To: %s" % info["author_addr"],
u"Date: %s" % libbe.utility.time_to_str(time.time()),
u"Content-Type: text/plain; charset=%s"%info["encoding"],
u"Content-Transfer-Encoding: 8bit",
u"Subject: %s Re: %s"%(SUBJECT_COMMENT,info["command"]),
]
if "message-id" in info:
response_header.append(u"In-reply-to: %s" % info["message-id"])
response_body = [u"Results of running: (exit code %d)" % ret,
u" %s %s" % (info["command"],
u" ".join(info["command_args"]))]
if out_text != None and len(out_text) > 0:
response_body.extend([u"", u"stdout:", u"", out_text])
if err_text != None and len(err_text) > 0:
response_body.extend([u"", u"stderr:", u"", err_text])
response_body.append(u"") # trailing endline
response_email = send_pgp_mime.Mail(u"\n".join(response_header),
u"\n".join(response_body))
if LOGFILE != None:
LOGFILE.write("responding to %s: %s\n"
% (info["author_addr"], info["command"]))
LOGFILE.write("\n%s\n\n" % send_pgp_mime.flatten(response_email.plain()))
return response_email
def open_logfile(logpath=None):
"""
If logpath=None, default to global LOGPATH.
Special logpath strings:
"-" set LOGFILE to sys.stderr
"none" disable logging
Relative logpaths are expanded relative to _THIS_DIR
"""
global LOGPATH, LOGFILE
if logpath != None:
if logpath == "-":
LOGPATH = "stderr"
LOGFILE = sys.stderr
elif logpath == "none":
LOGPATH = "none"
LOGFILE = None
elif os.path.isabs(logpath):
LOGPATH = options.path
else:
LOGPATH = os.path.join(_THIS_DIR, logpath)
if LOGFILE == None and LOGPATH != "none":
LOGFILE = file(LOGPATH, "a+")
def close_logfile():
if LOGFILE != None and LOGPATH not in ["stderr", "none"]:
LOGFILE.close()
def main():
from optparse import OptionParser
usage="be-handle-mail [options]\n\n%s" % (__doc__)
parser = OptionParser(usage=usage)
parser.add_option('-o', '--output', dest='output', action='store_true',
help="Don't mail the generated message, print it to stdout instead. Useful for testing be-handle-mail functionality without the whole mail transfer agent and procmail setup.")
parser.add_option('-l', '--logfile', dest='logfile', metavar='LOGFILE',
help='Set the logfile to LOGFILE. Relative paths are relative to the location of this be-handle-mail file (%s). The special value of "-" directs the log output to stderr, and "none" disables logging.' % _THIS_DIR)
options,args = parser.parse_args()
open_logfile(options.logfile)
msg_text = sys.stdin.read()
try:
ret,out_text,err_text,info = run_message(msg_text)
except InvalidEmail, e:
ret,out_text,err_text,info = e.response()
except Exception, e:
if LOGFILE != None:
LOGFILE.write("Uncaught exception:\n%s\n" % (e,))
close_logfile()
sys.exit(1)
response_email = compose_response(ret, out_text, err_text, info).plain()
if options.output == True:
print send_pgp_mime.flatten(response_email)
else:
send_pgp_mime.mail(response_email, send_pgp_mime.sendmail)
close_logfile()
if __name__ == "__main__":
main()
