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import os
from base64 import b64decode
from functools import wraps
from socket import socketpair
import varlink
class QMAuthError(Exception):
def __init__(self, rc):
super().__init__(rc)
self.rc = rc
class JWebmailMailStorageError(Exception):
def __init__(self, err, params):
self.name = err
self.parameters = params
def remap_errors(func):
prefix = "de.jmhoffmann.jwebmail.mail-storage."
@wraps(func)
def decorator(*args, **kvargs):
try:
return func(*args, **kvargs)
except varlink.VarlinkError as ex:
if (name := ex.error().removeprefix(prefix)) != ex.error():
raise JWebmailMailStorageError(name, ex.parameters())
else:
raise
return decorator
class QMailAuthuser:
def __init__(self, prog, mailbox_path, virtual_user, authenticator):
self._prog = prog
self._mailbox_path = mailbox_path
self._virtual_user = virtual_user
self._authenticator = authenticator
self._pid = None
self._socket = None
self._client = None
self._connection = None
@remap_errors
def list_search(self, folder, bound, after, limit, sort, search):
sort_val = dict()
if sort[0] == "!":
sort = sort[1:]
sort_val["direction"] = "desc"
else:
sort_val["direction"] = "asc"
match sort:
case "date" | "sender" | "size":
sort_val["parameter"] = sort
case _:
raise ValueError(f"invalid sort parameter {sort!r}")
if bound is not None:
param, mid = bound.split("_", 1)
bound = {"param": param, "id": mid}
req = self._connection.ListSearch(
folder=folder,
bound=bound,
direction="after" if after else "before",
limit=limit,
sort=sort_val,
search=search,
)
return (
[
{
"message_handle": lmh["mid"],
"byte_size": lmh["byte_size"],
"unread": lmh["unread"],
"date_received": lmh["rec_date"],
"head": self._mail_header(lmh["header"]),
}
for lmh in req["mail_heads"]
],
req["first"],
req["last"],
)
@remap_errors
def count(self, folder):
resp = self._connection.Stats(folder=folder)
return {
"byte_size": resp["byte_size"],
"total_mails": resp["mail_count"],
"unread_mails": resp["unread_count"],
}
@remap_errors
def show(self, folder, msgid):
resp = self._connection.Show(folder=folder, mid=msgid)
return {
"head": self._mail_header(resp["mail"]["head"]),
"body": self._mail_body(resp["mail"]["body"]),
}
@remap_errors
def raw(self, folder, mid, path):
resp = self._connection.Raw(folder=folder, mid=mid, path=path)
return {
"head": self._mime_header(resp["header"]),
"body": b64decode(resp["body"]),
}
@remap_errors
def folders(self):
resp = self._connection.Folders()
return list(resp["folders"]) + [""]
@remap_errors
def move(self, mid, from_f, to_f):
self._connection.Move(mid=mid, from_folder=from_f, to_folder=to_f)
return True
@remap_errors
def remove(self, folder, msgid):
self._connection.Remove(folder=folder, mid=msgid)
return True
@remap_errors
def add_folder(self, name):
resp = self._connection.AddFolder(name=name)
return resp["status"]
@staticmethod
def _address(addr):
if not addr:
return None
a = {"address": addr["address"]}
if addr.get("name"):
a["display_name"] = addr["name"]
return a
def _mail_header(self, mail_head):
h = mail_head
return {
"date": h["send_date"],
"sender": self._address(h.get("sender")),
"cc": [self._address(x) for x in h["cc"] if x],
"bcc": [self._address(x) for x in h["bcc"] if x],
"from": [self._address(x) for x in h["written_from"] if x],
"reply_to": [self._address(x) for x in h["reply_to"] if x],
"to": [self._address(x) for x in h["send_to"] if x],
"subject": h["subject"],
"comments": list(h["comments"]),
"keywords": list(h["keywords"]),
"mime": self._mime_header(h["mime"]),
}
@staticmethod
def _mime_header(mime_head):
mh = {
"content_maintype": mime_head["mime_type"]["main_type"],
"content_subtype": mime_head["mime_type"]["sub_type"],
}
match mime_head["content_dispo"]:
case "inline":
mh["content_disposition"] = "inline"
case "attachment":
mh["content_disposition"] = "attachment"
case "none":
mh["content_disposition"] = None
case invalid:
raise ValueError(f"invalid content disposition {invalid!r}")
if "file_name" in mime_head:
mh["filename"] = mime_head["file_name"]
return mh
def _mail_body(self, body):
assert len(body) == 1
if "discrete" in body:
return body["discrete"]
elif "multipart" in body:
res = {"parts": []}
for mp in body["multipart"]["parts"]:
r = {"head": self._mime_header(mp["mime_header"])}
if mp["mime_header"]["content_dispo"] != "attachment":
r["body"] = self._mail_body(mp["body"])
res["parts"].append(r)
if pr := body["multipart"].get("preamble"):
res["preamble"] = pr
if ep := body["multipart"].get("epilogue"):
res["epilogue"] = ep
return res
elif "mail" in body:
return {
"head": self._mail_header(body["mail"]["head"]),
"body": self._mail_body(body["mail"]["body"]),
}
else:
assert False
def open(self, username, password):
rp, wp = os.pipe()
sp, sc = socketpair()
cmdline = [self._authenticator, self._prog]
if (pid := os.fork()) == 0:
# child
os.close(wp)
sp.close()
os.dup2(rp, 3)
os.dup2(sc.fileno(), 4)
os.environ["LISTEN_FDS"] = "2"
os.environ["LISTEN_FDNAMES"] = "auth:varlink"
os.environ["LISTEN_PID"] = str(os.getpid())
os.execvp(self._authenticator, cmdline)
assert False
sc.close()
os.close(rp)
os.write(wp, f"{username}\0{password}\0\0".encode())
os.close(wp)
self._pid = pid
self._socket = sp
self._client = varlink.Client()
try:
self._connection = self._client.open(
"de.jmhoffmann.jwebmail.mail-storage", connection=sp
)
except ConnectionResetError:
pid, status = os.waitpid(self._pid, 0)
if (rc := os.waitstatus_to_exitcode(status)) != 0:
raise QMAuthError(rc)
else:
raise
user = username[: username.index("@")]
try:
self._connection.Init(
unix_user=self._virtual_user,
mailbox_path=os.path.join(self._mailbox_path, user),
)
except BrokenPipeError:
pid, status = os.waitpid(self._pid, 0)
assert pid == self._pid
if (rc := os.waitstatus_to_exitcode(status)) != 0:
raise QMAuthError(rc)
else:
raise
return self
def close(self):
self._connection.close()
self._socket.close()
pid, status = os.waitpid(self._pid, 0)
assert pid == self._pid
rc = os.waitstatus_to_exitcode(status)
if rc != 0:
raise QMAuthError(rc)
def __enter__(self):
return self
def __exit__(self, ex_type, ex_val, ex_tb):
if ex_val is None:
self.close()
elif issubclass(ex_type, BrokenPipeError):
pid, _status = os.waitpid(self._pid, 0)
assert pid == self._pid
return False
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