303 lines
11 KiB
Python
303 lines
11 KiB
Python
from dataclasses import dataclass
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from flask import render_template, redirect, url_for, flash, request
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from flask_login import login_required, current_user
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from itsdangerous import TimestampSigner, SignatureExpired
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from sqlalchemy.exc import IntegrityError
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from app.alias_utils import check_alias_prefix
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from app.config import (
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DISABLE_ALIAS_SUFFIX,
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CUSTOM_ALIAS_SECRET,
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ALIAS_LIMIT,
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)
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from app.dashboard.base import dashboard_bp
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from app.extensions import db, limiter
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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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DeletedAlias,
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Mailbox,
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User,
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AliasMailbox,
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DomainDeletedAlias,
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)
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from app.utils import convert_to_id, random_word, word_exist
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signer = TimestampSigner(CUSTOM_ALIAS_SECRET)
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@dataclass
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class SuffixInfo:
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"""Alias suffix info"""
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# whether this is a custom domain
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is_custom: bool
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suffix: str
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signed_suffix: str
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# whether this is a premium SL domain. Not apply to custom domain
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is_premium: bool
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def get_available_suffixes(user: User) -> [SuffixInfo]:
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"""
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Similar to as available_suffixes() but also return whether the suffix comes from a premium domain
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Note that is-premium-domain is only relevant for SL domain
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"""
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user_custom_domains = user.verified_custom_domains()
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suffixes: [SuffixInfo] = []
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# put custom domain first
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# for each user domain, generate both the domain and a random suffix version
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for custom_domain in user_custom_domains:
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if custom_domain.random_prefix_generation:
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suffix = "." + random_word() + "@" + custom_domain.domain
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suffix_info = SuffixInfo(True, suffix, signer.sign(suffix).decode(), False)
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if user.default_alias_custom_domain_id == custom_domain.id:
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suffixes.insert(0, suffix_info)
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else:
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suffixes.append(suffix_info)
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suffix = "@" + custom_domain.domain
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suffix_info = SuffixInfo(True, suffix, signer.sign(suffix).decode(), False)
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# put the default domain to top
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# only if random_prefix_generation isn't enabled
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if (
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user.default_alias_custom_domain_id == custom_domain.id
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and not custom_domain.random_prefix_generation
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):
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suffixes.insert(0, suffix_info)
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else:
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suffixes.append(suffix_info)
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# then SimpleLogin domain
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for sl_domain in user.get_sl_domains():
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suffix = (
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("" if DISABLE_ALIAS_SUFFIX else "." + random_word())
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+ "@"
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+ sl_domain.domain
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)
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suffix_info = SuffixInfo(
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False, suffix, signer.sign(suffix).decode(), sl_domain.premium_only
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)
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# put the default domain to top
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if user.default_alias_public_domain_id == sl_domain.id:
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suffixes.insert(0, suffix_info)
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else:
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suffixes.append(suffix_info)
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return suffixes
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@dashboard_bp.route("/custom_alias", methods=["GET", "POST"])
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@limiter.limit(ALIAS_LIMIT, methods=["POST"])
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@login_required
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def custom_alias():
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# check if user has not exceeded the alias quota
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if not current_user.can_create_new_alias():
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LOG.warning("user %s tries to create custom alias", current_user)
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flash(
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"You have reached free plan limit, please upgrade to create new aliases",
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"warning",
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)
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return redirect(url_for("dashboard.index"))
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user_custom_domains = [cd.domain for cd in current_user.verified_custom_domains()]
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suffixes = get_available_suffixes(current_user)
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at_least_a_premium_domain = False
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for suffix in suffixes:
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if not suffix.is_custom and suffix.is_premium:
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at_least_a_premium_domain = True
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break
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mailboxes = current_user.mailboxes()
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if request.method == "POST":
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alias_prefix = request.form.get("prefix").strip().lower().replace(" ", "")
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signed_suffix = request.form.get("suffix")
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mailbox_ids = request.form.getlist("mailboxes")
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alias_note = request.form.get("note")
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if not check_alias_prefix(alias_prefix):
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flash(
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"Only lowercase letters, numbers, dashes (-) and underscores (_) "
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"are currently supported for alias prefix. Cannot be more than 40 letters",
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"error",
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)
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return redirect(url_for("dashboard.custom_alias"))
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# check if mailbox is not tempered with
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mailboxes = []
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for mailbox_id in mailbox_ids:
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mailbox = Mailbox.get(mailbox_id)
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if (
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not mailbox
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or mailbox.user_id != current_user.id
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or not mailbox.verified
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):
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flash("Something went wrong, please retry", "warning")
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return redirect(url_for("dashboard.custom_alias"))
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mailboxes.append(mailbox)
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if not mailboxes:
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flash("At least one mailbox must be selected", "error")
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return redirect(url_for("dashboard.custom_alias"))
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# hypothesis: user will click on the button in the 600 secs
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try:
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alias_suffix = signer.unsign(signed_suffix, max_age=600).decode()
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except SignatureExpired:
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LOG.warning("Alias creation time expired for %s", current_user)
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flash("Alias creation time is expired, please retry", "warning")
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return redirect(url_for("dashboard.custom_alias"))
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except Exception:
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LOG.warning("Alias suffix is tampered, user %s", current_user)
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flash("Unknown error, refresh the page", "error")
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return redirect(url_for("dashboard.custom_alias"))
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if verify_prefix_suffix(current_user, alias_prefix, alias_suffix):
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full_alias = alias_prefix + alias_suffix
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general_error_msg = f"{full_alias} cannot be used"
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if Alias.get_by(email=full_alias):
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alias = Alias.get_by(email=full_alias)
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if alias.user_id == current_user.id:
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flash(f"You already have this alias {full_alias}", "error")
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else:
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flash(general_error_msg, "error")
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elif DomainDeletedAlias.get_by(email=full_alias):
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domain_deleted_alias: DomainDeletedAlias = DomainDeletedAlias.get_by(
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email=full_alias
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)
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custom_domain = domain_deleted_alias.domain
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if domain_deleted_alias.user_id == current_user.id:
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flash(
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f"You have deleted this alias before. You can restore it on "
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f"{custom_domain.domain} 'Deleted Alias' page",
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"error",
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)
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else:
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# should never happen as user can only choose their domains
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LOG.exception(
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"Deleted Alias %s does not belong to user %s",
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domain_deleted_alias,
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)
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elif DeletedAlias.get_by(email=full_alias):
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flash(general_error_msg, "error")
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else:
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custom_domain_id = None
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# get the custom_domain_id if alias is created with a custom domain
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if alias_suffix.startswith("@"):
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alias_domain = alias_suffix[1:]
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domain = CustomDomain.get_by(domain=alias_domain)
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# check if the alias is currently in the domain trash
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if domain and DomainDeletedAlias.get_by(
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domain_id=domain.id, email=full_alias
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):
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flash(
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f"Alias {full_alias} is currently in the {domain.domain} trash. "
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f"Please remove it from the trash in order to re-create it.",
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"warning",
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)
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return redirect(url_for("dashboard.custom_alias"))
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if domain:
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custom_domain_id = domain.id
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try:
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alias = Alias.create(
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user_id=current_user.id,
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email=full_alias,
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note=alias_note,
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mailbox_id=mailboxes[0].id,
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custom_domain_id=custom_domain_id,
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)
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db.session.flush()
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except IntegrityError:
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LOG.warning("Alias %s already exists", full_alias)
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db.session.rollback()
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flash("Unknown error, please retry", "error")
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return redirect(url_for("dashboard.custom_alias"))
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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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db.session.commit()
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flash(f"Alias {full_alias} has been created", "success")
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return redirect(url_for("dashboard.index", highlight_alias_id=alias.id))
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# only happen if the request has been "hacked"
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else:
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flash("something went wrong", "warning")
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return render_template(
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"dashboard/custom_alias.html",
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user_custom_domains=user_custom_domains,
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suffixes=suffixes,
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at_least_a_premium_domain=at_least_a_premium_domain,
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mailboxes=mailboxes,
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)
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def verify_prefix_suffix(user: User, alias_prefix, alias_suffix) -> bool:
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"""verify if user could create an alias with the given prefix and suffix"""
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if not alias_prefix or not alias_suffix: # should be caught on frontend
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return False
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user_custom_domains = [cd.domain for cd in user.verified_custom_domains()]
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# make sure alias_suffix is either .random_word@simplelogin.co or @my-domain.com
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alias_suffix = alias_suffix.strip()
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# alias_domain_prefix is either a .random_word or ""
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alias_domain_prefix, alias_domain = alias_suffix.split("@", 1)
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# alias_domain must be either one of user custom domains or built-in domains
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if alias_domain not in user.available_alias_domains():
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LOG.exception("wrong alias suffix %s, user %s", alias_suffix, user)
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return False
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# SimpleLogin domain case:
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# 1) alias_suffix must start with "." and
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# 2) alias_domain_prefix must come from the word list
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if (
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alias_domain in user.available_sl_domains()
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and alias_domain not in user_custom_domains
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# when DISABLE_ALIAS_SUFFIX is true, alias_domain_prefix is empty
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and not DISABLE_ALIAS_SUFFIX
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):
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if not alias_domain_prefix.startswith("."):
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LOG.exception("User %s submits a wrong alias suffix %s", user, alias_suffix)
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return False
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random_word_part = alias_domain_prefix[1:]
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if not word_exist(random_word_part):
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LOG.exception(
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"alias suffix %s needs to start with a random word, user %s",
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alias_suffix,
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user,
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)
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return False
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else:
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if alias_domain not in user_custom_domains:
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if not DISABLE_ALIAS_SUFFIX:
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LOG.exception("wrong alias suffix %s, user %s", alias_suffix, user)
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return False
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if alias_domain not in user.available_sl_domains():
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LOG.exception("wrong alias suffix %s, user %s", alias_suffix, user)
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return False
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return True
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