269 lines
8.3 KiB
Python
269 lines
8.3 KiB
Python
from typing import Optional
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import re2 as re
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from email_validator import validate_email, EmailNotValidError
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from sqlalchemy.exc import IntegrityError, DataError
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from app.config import BOUNCE_PREFIX_FOR_REPLY_PHASE
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from app.db import Session
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from app.email_utils import (
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get_email_domain_part,
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send_cannot_create_directory_alias,
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send_cannot_create_domain_alias,
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can_create_directory_for_address,
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send_cannot_create_directory_alias_disabled,
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get_email_local_part,
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)
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from app.errors import AliasInTrashError
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from app.log import LOG
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from app.models import (
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Alias,
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CustomDomain,
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Directory,
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User,
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DeletedAlias,
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DomainDeletedAlias,
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AliasMailbox,
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Mailbox,
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EmailLog,
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Contact,
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AutoCreateRule,
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)
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def try_auto_create(address: str) -> Optional[Alias]:
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"""Try to auto-create the alias using directory or catch-all domain"""
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if address.startswith(f"{BOUNCE_PREFIX_FOR_REPLY_PHASE}+"):
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LOG.e("alias %s can't start with %s", address, BOUNCE_PREFIX_FOR_REPLY_PHASE)
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return None
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try:
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# NOT allow unicode for now
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validate_email(address, check_deliverability=False, allow_smtputf8=False)
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except EmailNotValidError:
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return None
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alias = try_auto_create_via_domain(address)
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if not alias:
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alias = try_auto_create_directory(address)
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return alias
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def try_auto_create_directory(address: str) -> Optional[Alias]:
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"""
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Try to create an alias with directory
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"""
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# check if alias belongs to a directory, ie having directory/anything@EMAIL_DOMAIN format
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if can_create_directory_for_address(address):
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# if there's no directory separator in the alias, no way to auto-create it
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if "/" not in address and "+" not in address and "#" not in address:
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return None
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# alias contains one of the 3 special directory separator: "/", "+" or "#"
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if "/" in address:
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sep = "/"
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elif "+" in address:
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sep = "+"
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else:
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sep = "#"
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directory_name = address[: address.find(sep)]
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LOG.d("directory_name %s", directory_name)
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directory = Directory.get_by(name=directory_name)
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if not directory:
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return None
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user: User = directory.user
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if not user.can_create_new_alias():
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send_cannot_create_directory_alias(user, address, directory_name)
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return None
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if directory.disabled:
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send_cannot_create_directory_alias_disabled(user, address, directory_name)
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return None
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try:
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LOG.d("create alias %s for directory %s", address, directory)
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mailboxes = directory.mailboxes
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alias = Alias.create(
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email=address,
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user_id=directory.user_id,
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directory_id=directory.id,
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mailbox_id=mailboxes[0].id,
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note=f"Created by directory {directory.name}",
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)
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Session.flush()
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for i in range(1, len(mailboxes)):
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AliasMailbox.create(
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alias_id=alias.id,
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mailbox_id=mailboxes[i].id,
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)
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Session.commit()
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return alias
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except AliasInTrashError:
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LOG.w(
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"Alias %s was deleted before, cannot auto-create using directory %s, user %s",
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address,
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directory_name,
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user,
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)
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return None
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except IntegrityError:
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LOG.w("Alias %s already exists", address)
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Session.rollback()
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alias = Alias.get_by(email=address)
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return alias
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def try_auto_create_via_domain(address: str) -> Optional[Alias]:
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"""Try to create an alias with catch-all or auto-create rules on custom domain"""
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# try to create alias on-the-fly with custom-domain catch-all feature
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# check if alias is custom-domain alias and if the custom-domain has catch-all enabled
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alias_domain = get_email_domain_part(address)
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custom_domain: CustomDomain = CustomDomain.get_by(domain=alias_domain)
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if not custom_domain:
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return None
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if not custom_domain.catch_all and len(custom_domain.auto_create_rules) == 0:
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return None
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elif not custom_domain.catch_all and len(custom_domain.auto_create_rules) > 0:
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local = get_email_local_part(address)
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for rule in custom_domain.auto_create_rules:
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rule: AutoCreateRule
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regex = re.compile(rule.regex)
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if re.fullmatch(regex, local):
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LOG.d(
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"%s passes %s on %s",
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address,
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rule.regex,
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custom_domain,
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)
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alias_note = f"Created by rule {rule.order} with regex {rule.regex}"
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mailboxes = rule.mailboxes
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break
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else: # no rule passes
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LOG.d("no rule passed to create %s", local)
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return
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else: # catch-all is enabled
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mailboxes = custom_domain.mailboxes
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alias_note = "Created by catch-all option"
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domain_user: User = custom_domain.user
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if not domain_user.can_create_new_alias():
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send_cannot_create_domain_alias(domain_user, address, alias_domain)
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return None
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try:
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LOG.d("create alias %s for domain %s", address, custom_domain)
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alias = Alias.create(
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email=address,
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user_id=custom_domain.user_id,
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custom_domain_id=custom_domain.id,
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automatic_creation=True,
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mailbox_id=mailboxes[0].id,
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note=alias_note,
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)
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Session.flush()
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for i in range(1, len(mailboxes)):
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AliasMailbox.create(
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alias_id=alias.id,
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mailbox_id=mailboxes[i].id,
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)
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Session.commit()
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return alias
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except AliasInTrashError:
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LOG.w(
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"Alias %s was deleted before, cannot auto-create using domain catch-all %s, user %s",
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address,
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custom_domain,
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domain_user,
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)
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return None
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except IntegrityError:
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LOG.w("Alias %s already exists", address)
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Session.rollback()
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alias = Alias.get_by(email=address)
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return alias
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except DataError:
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LOG.w("Cannot create alias %s", address)
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Session.rollback()
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return None
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def delete_alias(alias: Alias, user: User):
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"""
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Delete an alias and add it to either global or domain trash
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Should be used instead of Alias.delete, DomainDeletedAlias.create, DeletedAlias.create
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"""
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# save deleted alias to either global or domain trash
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if alias.custom_domain_id:
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if not DomainDeletedAlias.get_by(
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email=alias.email, domain_id=alias.custom_domain_id
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):
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LOG.d("add %s to domain %s trash", alias, alias.custom_domain_id)
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Session.add(
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DomainDeletedAlias(
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user_id=user.id, email=alias.email, domain_id=alias.custom_domain_id
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)
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)
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Session.commit()
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else:
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if not DeletedAlias.get_by(email=alias.email):
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LOG.d("add %s to global trash", alias)
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Session.add(DeletedAlias(email=alias.email))
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Session.commit()
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Alias.filter(Alias.id == alias.id).delete()
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Session.commit()
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def aliases_for_mailbox(mailbox: Mailbox) -> [Alias]:
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"""
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get list of aliases for a given mailbox
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"""
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ret = set(Alias.filter(Alias.mailbox_id == mailbox.id).all())
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for alias in (
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Session.query(Alias)
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.join(AliasMailbox, Alias.id == AliasMailbox.alias_id)
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.filter(AliasMailbox.mailbox_id == mailbox.id)
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):
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ret.add(alias)
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return list(ret)
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def nb_email_log_for_mailbox(mailbox: Mailbox):
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aliases = aliases_for_mailbox(mailbox)
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alias_ids = [alias.id for alias in aliases]
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return (
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Session.query(EmailLog)
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.join(Contact, EmailLog.contact_id == Contact.id)
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.filter(Contact.alias_id.in_(alias_ids))
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.count()
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)
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# Only lowercase letters, numbers, dots (.), dashes (-) and underscores (_) are currently supported
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_ALIAS_PREFIX_PATTERN = r"[0-9a-z-_.]{1,}"
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def check_alias_prefix(alias_prefix) -> bool:
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if len(alias_prefix) > 40:
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return False
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if re.fullmatch(_ALIAS_PREFIX_PATTERN, alias_prefix) is None:
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return False
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return True
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