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@ -4,11 +4,10 @@ import ssl
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from _contextvars import ContextVar
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from dataclasses import dataclass
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from pathlib import Path
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from typing import ClassVar, List, Coroutine
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from collections import deque
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from typing import ClassVar, List, Set
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from .poputils import InvalidCommand, parse_command, err, Command, ClientQuit, ClientError, AuthError, ok, msg, end, \
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MailStorage, Request
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Request, MailEntry, get_mail, get_mails_list, MailList
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@dataclass
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@ -18,9 +17,8 @@ class Session:
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username: str = ""
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read_items: Path = None
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# common state
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all_sessions: ClassVar[List] = []
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all_sessions: ClassVar[Set] = set()
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mails_path: ClassVar[Path] = Path("")
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wait_for_privileges_to_drop: ClassVar[Coroutine] = None
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pending_request: Request = None
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def pop_request(self):
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@ -84,7 +82,9 @@ async def handle_user_pass_auth(user_cmd):
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password = cmd.arg1
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validate_user_and_pass(username, password)
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write(ok("Good"))
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return username, password
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logging.info(f"User: {username} has logged in successfully")
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session.username = username
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Session.all_sessions.add(username)
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async def auth_stage():
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@ -98,9 +98,7 @@ async def auth_stage():
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write(msg("USER"))
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write(end())
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else:
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username, password = await handle_user_pass_auth(req)
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logging.info(f"User: {username} has logged in successfully")
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return username
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return await handle_user_pass_auth(req)
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except AuthError:
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write(err("Wrong auth"))
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except ClientQuit as c:
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@ -111,65 +109,96 @@ async def auth_stage():
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raise ClientError("Failed to authenticate")
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async def transaction_stage():
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async def process_transactions(mails_list: List[MailEntry]):
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session: Session = current_session.get()
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logging.debug(f"Entering transaction stage for {session.username}")
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deleted_message_ids = []
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mailbox = MailStorage(Session.mails_path / 'new')
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with session.read_items.open() as f:
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read_items = set(f.read().splitlines())
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mails = MailList(mails_list)
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mails_list = mailbox.get_mails_list()
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mails_map = {str(entry.nid): entry for entry in mails_list}
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while True:
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try:
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req = await next_req()
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req = await session.next_req()
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logging.debug(f"Request: {req}")
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if req.cmd is Command.CAPA:
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write(ok("No CAPA"))
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write(ok("CAPA follows"))
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write(msg("UIDL"))
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write(end())
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elif req.cmd is Command.STAT:
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num, size = mailbox.get_mailbox_size()
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num, size = mails.compute_stat()
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write(ok(f"{num} {size}"))
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elif req.cmd is Command.LIST:
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if req.arg1:
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write(ok(f"{req.arg1} {mails_map[req.arg1].size}"))
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entry = mails.get(req.arg1)
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if entry:
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write(ok(f"{req.arg1} {entry.size}"))
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else:
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write(err("Not found"))
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else:
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write(ok("Mails follow"))
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for entry in mails_list:
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for entry in mails.get_all():
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write(msg(f"{entry.nid} {entry.size}"))
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write(end())
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elif req.cmd is Command.UIDL:
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if req.arg1:
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write(ok(f"{req.arg1} {mails_map[req.arg1].uid}"))
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entry = mails.get(req.arg1)
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if entry:
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write(ok(f"{req.arg1} {entry.uid}"))
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else:
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write(err("Not found"))
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else:
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write(ok("Mails follow"))
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for entry in mails_list:
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for entry in mails.get_all():
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write(msg(f"{entry.nid} {entry.uid}"))
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write(end())
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await session.writer.drain()
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elif req.cmd is Command.RETR:
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if req.arg1 not in mails_map:
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write(err("Not found"))
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else:
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entry = mails.get(req.arg1)
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if entry:
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write(ok("Contents follow"))
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write(mailbox.get_mail(mails_map[req.arg1]))
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write(get_mail(entry))
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write(end())
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await session.writer.drain()
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else:
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write(err("Not found"))
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elif req.cmd is Command.DELE:
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entry = mails.get(req.arg1)
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if entry:
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mails.delete(req.arg1)
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else:
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write(err("Not found"))
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elif req.cmd is Command.RSET:
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mails = MailList(mails_list)
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elif req.cmd is Command.NOOP:
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pass
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else:
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write(err("Not implemented"))
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raise ClientError("We shouldn't reach here")
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except ClientQuit:
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write(ok("Bye"))
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return deleted_message_ids
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return mails.deleted_uids
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async def transaction_stage():
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session: Session = current_session.get()
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logging.debug(f"Entering transaction stage for {session.username}")
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session.read_items = Session.mails_path / session.username
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with session.read_items.open() as f:
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read_items = set(f.read().splitlines())
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mails_list = [entry for entry in get_mails_list(Session.mails_path / 'new') if entry.uid not in read_items]
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return await process_transactions(mails_list)
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def delete_messages(delete_ids):
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session: Session = current_session.get()
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with session.read_items.open(mode="w") as f:
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f.writelines(delete_ids)
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logging.info(f"Client deleted these ids {delete_ids}")
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async def new_session(stream_reader: asyncio.StreamReader, stream_writer: asyncio.StreamWriter):
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current_session.set(Session(stream_reader, stream_writer))
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session = Session(stream_reader, stream_writer)
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current_session.set(session)
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logging.info(f"New session started with {stream_reader} and {stream_writer}")
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try:
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await auth_stage()
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@ -182,6 +211,8 @@ async def new_session(stream_reader: asyncio.StreamReader, stream_writer: asynci
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logging.error(f"Serious client error", e)
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raise
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finally:
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if session.username:
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Session.all_sessions.remove(session.username)
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stream_writer.close()
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@ -28,15 +28,17 @@ User = NewType('User', str)
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class Command(Enum):
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CAPA = auto()
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USER = auto()
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PASS = auto()
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CAPA = auto()
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QUIT = auto()
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STAT = auto()
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LIST = auto()
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UIDL = auto()
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RETR = auto()
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DELE = auto()
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STAT = auto()
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RSET = auto()
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NOOP = auto()
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@dataclass
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@ -88,11 +90,6 @@ def parse_command(line: bytes) -> Request:
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return request
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def files_in_path(path):
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for _, _, files in os.walk(path):
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return [(f, os.path.join(path, f)) for f in files]
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@dataclass
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class MailEntry:
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uid: str
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@ -109,23 +106,46 @@ class MailEntry:
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self.path = path
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class MailStorage:
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def __init__(self, dirpath: Path):
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self.dirpath = dirpath
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self.files = files_in_path(self.dirpath)
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self.entries = [MailEntry(filename, path) for filename, path in self.files]
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self.entries = sorted(self.entries, reverse=True, key=lambda e: e.c_time)
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for i, entry in enumerate(self.entries, start=1):
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def files_in_path(path):
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for _, _, files in os.walk(path):
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return [(f, os.path.join(path, f)) for f in files]
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def get_mails_list(dirpath: Path) -> List[MailEntry]:
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files = files_in_path(dirpath)
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entries = [MailEntry(filename, path) for filename, path in files]
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return entries
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def set_nid(entries: List[MailEntry]):
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entries.sort(reverse=True, key=lambda e: e.c_time)
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entries = sorted(entries, reverse=True, key=lambda e: e.c_time)
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for i, entry in enumerate(entries, start=1):
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entry.nid = i
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def get_mailbox_size(self) -> (int, int):
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return len(self.entries), sum(entry.size for entry in self.entries)
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def get_mails_list(self) -> List[MailEntry]:
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return self.entries
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@staticmethod
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def get_mail(entry: MailEntry) -> bytes:
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def get_mail(entry: MailEntry) -> bytes:
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with open(entry.path, mode='rb') as fp:
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return fp.read()
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class MailList:
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def __init__(self, entries: List[MailEntry]):
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self.entries = entries
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set_nid(self.entries)
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self.mails_map = {str(e.nid): e for e in entries}
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self.deleted_uids = set()
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def delete(self, nid: str):
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self.deleted_uids.add(self.mails_map.pop(nid).uid)
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def get(self, nid: str):
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self.mails_map.get(nid)
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def get_all(self):
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return [e for e in self.entries if str(e.nid) in self.mails_map]
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def compute_stat(self):
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entries = self.get_all()
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return len(entries), sum(entry.size for entry in entries)
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