app-MAIL-temp/app/alias_suffix.py

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from __future__ import annotations
import json
from dataclasses import asdict, dataclass
from typing import Optional
import itsdangerous
from app import config
from app.log import LOG
from app.models import User
signer = itsdangerous.TimestampSigner(config.CUSTOM_ALIAS_SECRET)
@dataclass
class AliasSuffix:
# whether this is a custom domain
is_custom: bool
# Suffix
suffix: str
# Suffix signature
signed_suffix: str
# whether this is a premium SL domain. Not apply to custom domain
is_premium: bool
# can be either Custom or SL domain
domain: str
# if custom domain, whether the custom domain has MX verified, i.e. can receive emails
mx_verified: bool = True
def serialize(self):
return json.dumps(asdict(self))
@classmethod
def deserialize(cls, data: str) -> AliasSuffix:
return AliasSuffix(**json.loads(data))
def check_suffix_signature(signed_suffix: str) -> Optional[str]:
# hypothesis: user will click on the button in the 600 secs
try:
return signer.unsign(signed_suffix, max_age=600).decode()
except itsdangerous.BadSignature:
return None
def verify_prefix_suffix(user: User, alias_prefix, alias_suffix) -> bool:
"""verify if user could create an alias with the given prefix and suffix"""
if not alias_prefix or not alias_suffix: # should be caught on frontend
return False
user_custom_domains = [cd.domain for cd in user.verified_custom_domains()]
# make sure alias_suffix is either .random_word@simplelogin.co or @my-domain.com
alias_suffix = alias_suffix.strip()
# alias_domain_prefix is either a .random_word or ""
alias_domain_prefix, alias_domain = alias_suffix.split("@", 1)
# alias_domain must be either one of user custom domains or built-in domains
if alias_domain not in user.available_alias_domains():
LOG.e("wrong alias suffix %s, user %s", alias_suffix, user)
return False
# SimpleLogin domain case:
# 1) alias_suffix must start with "." and
# 2) alias_domain_prefix must come from the word list
if (
alias_domain in user.available_sl_domains()
and alias_domain not in user_custom_domains
# when DISABLE_ALIAS_SUFFIX is true, alias_domain_prefix is empty
and not config.DISABLE_ALIAS_SUFFIX
):
if not alias_domain_prefix.startswith("."):
LOG.e("User %s submits a wrong alias suffix %s", user, alias_suffix)
return False
else:
if alias_domain not in user_custom_domains:
if not config.DISABLE_ALIAS_SUFFIX:
LOG.e("wrong alias suffix %s, user %s", alias_suffix, user)
return False
if alias_domain not in user.available_sl_domains():
LOG.e("wrong alias suffix %s, user %s", alias_suffix, user)
return False
return True
def get_alias_suffixes(user: User) -> [AliasSuffix]:
"""
Similar to as get_available_suffixes() but also return custom domain that doesn't have MX set up.
"""
user_custom_domains = user.verified_custom_domains()
alias_suffixes: [AliasSuffix] = []
# put custom domain first
# for each user domain, generate both the domain and a random suffix version
for custom_domain in user_custom_domains:
if custom_domain.random_prefix_generation:
suffix = "." + user.get_random_alias_suffix() + "@" + custom_domain.domain
alias_suffix = AliasSuffix(
is_custom=True,
suffix=suffix,
signed_suffix=signer.sign(suffix).decode(),
is_premium=False,
domain=custom_domain.domain,
mx_verified=custom_domain.verified,
)
if user.default_alias_custom_domain_id == custom_domain.id:
alias_suffixes.insert(0, alias_suffix)
else:
alias_suffixes.append(alias_suffix)
suffix = "@" + custom_domain.domain
alias_suffix = AliasSuffix(
is_custom=True,
suffix=suffix,
signed_suffix=signer.sign(suffix).decode(),
is_premium=False,
domain=custom_domain.domain,
mx_verified=custom_domain.verified,
)
# put the default domain to top
# only if random_prefix_generation isn't enabled
if (
user.default_alias_custom_domain_id == custom_domain.id
and not custom_domain.random_prefix_generation
):
alias_suffixes.insert(0, alias_suffix)
else:
alias_suffixes.append(alias_suffix)
# then SimpleLogin domain
for sl_domain in user.get_sl_domains():
suffix = (
(
""
if config.DISABLE_ALIAS_SUFFIX
else "." + user.get_random_alias_suffix()
)
+ "@"
+ sl_domain.domain
)
alias_suffix = AliasSuffix(
is_custom=False,
suffix=suffix,
signed_suffix=signer.sign(suffix).decode(),
is_premium=sl_domain.premium_only,
domain=sl_domain.domain,
mx_verified=True,
)
# put the default domain to top
if user.default_alias_public_domain_id == sl_domain.id:
alias_suffixes.insert(0, alias_suffix)
else:
alias_suffixes.append(alias_suffix)
return alias_suffixes