app-MAIL-temp/app/dashboard/views/custom_alias.py

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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
from itsdangerous import TimestampSigner, SignatureExpired
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from app.config import (
DISABLE_ALIAS_SUFFIX,
ALIAS_DOMAINS,
CUSTOM_ALIAS_SECRET,
)
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from app.dashboard.base import dashboard_bp
from app.email_utils import email_belongs_to_alias_domains, get_email_domain_part
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from app.extensions import db
from app.log import LOG
from app.models import Alias, CustomDomain, DeletedAlias, Mailbox, User
from app.utils import convert_to_id, random_word, word_exist
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signer = TimestampSigner(CUSTOM_ALIAS_SECRET)
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def available_suffixes(user: User) -> [bool, str, str]:
"""Return (is_custom_domain, alias-suffix, time-signed alias-suffix)"""
user_custom_domains = [cd.domain for cd in user.verified_custom_domains()]
# List of (is_custom_domain, alias-suffix, time-signed alias-suffix)
suffixes = []
# put custom domain first
for alias_domain in user_custom_domains:
suffix = "@" + alias_domain
suffixes.append((True, suffix, signer.sign(suffix).decode()))
# then default domain
for domain in ALIAS_DOMAINS:
suffix = ("" if DISABLE_ALIAS_SUFFIX else "." + random_word()) + "@" + domain
suffixes.append((False, suffix, signer.sign(suffix).decode()))
return suffixes
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@dashboard_bp.route("/custom_alias", methods=["GET", "POST"])
@login_required
def custom_alias():
# check if user has not exceeded the alias quota
if not current_user.can_create_new_alias():
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# notify admin
LOG.error("user %s tries to create custom alias", current_user)
flash(
"You have reached free plan limit, please upgrade to create new aliases",
"warning",
)
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return redirect(url_for("dashboard.index"))
user_custom_domains = [cd.domain for cd in current_user.verified_custom_domains()]
# List of (is_custom_domain, alias-suffix, time-signed alias-suffix)
suffixes = available_suffixes(current_user)
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mailboxes = [mb.email for mb in current_user.mailboxes()]
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if request.method == "POST":
alias_prefix = request.form.get("prefix")
signed_suffix = request.form.get("suffix")
mailbox_email = request.form.get("mailbox")
alias_note = request.form.get("note")
# check if mailbox is not tempered with
if mailbox_email != current_user.email:
mailbox = Mailbox.get_by(email=mailbox_email)
if not mailbox or mailbox.user_id != current_user.id:
flash("Something went wrong, please retry", "warning")
return redirect(url_for("dashboard.custom_alias"))
# hypothesis: user will click on the button in the 300 secs
try:
alias_suffix = signer.unsign(signed_suffix, max_age=300).decode()
except SignatureExpired:
LOG.error("Alias creation time expired")
flash("Alias creation time is expired, please retry", "warning")
return redirect(url_for("dashboard.custom_alias"))
except Exception:
LOG.error("Alias suffix is tampered, user %s", current_user)
flash("Unknown error, refresh the page", "error")
return redirect(url_for("dashboard.custom_alias"))
if verify_prefix_suffix(current_user, alias_prefix, alias_suffix):
full_alias = alias_prefix + alias_suffix
if Alias.get_by(email=full_alias) or DeletedAlias.get_by(email=full_alias):
LOG.d("full alias already used %s", full_alias)
flash(
f"Alias {full_alias} already exists, please choose another one",
"warning",
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)
else:
mailbox = Mailbox.get_by(email=mailbox_email)
alias = Alias.create(
user_id=current_user.id,
email=full_alias,
note=alias_note,
mailbox_id=mailbox.id,
)
# get the custom_domain_id if alias is created with a custom domain
alias_domain = get_email_domain_part(full_alias)
custom_domain = CustomDomain.get_by(domain=alias_domain)
if custom_domain:
LOG.d("Set alias %s domain to %s", full_alias, custom_domain)
alias.custom_domain_id = custom_domain.id
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db.session.commit()
flash(f"Alias {full_alias} has been created", "success")
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return redirect(url_for("dashboard.index", highlight_alias_id=alias.id))
# only happen if the request has been "hacked"
else:
flash("something went wrong", "warning")
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return render_template(
"dashboard/custom_alias.html",
user_custom_domains=user_custom_domains,
suffixes=suffixes,
mailboxes=mailboxes,
)
def verify_prefix_suffix(user, alias_prefix, alias_suffix) -> bool:
"""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
return False
user_custom_domains = [cd.domain for cd in user.verified_custom_domains()]
alias_prefix = alias_prefix.strip()
alias_prefix = convert_to_id(alias_prefix)
# make sure alias_suffix is either .random_word@simplelogin.co or @my-domain.com
alias_suffix = alias_suffix.strip()
if alias_suffix.startswith("@"):
alias_domain = alias_suffix[1:]
# alias_domain can be either custom_domain or if DISABLE_ALIAS_SUFFIX, one of the default ALIAS_DOMAINS
if DISABLE_ALIAS_SUFFIX:
if (
alias_domain not in user_custom_domains
and alias_domain not in ALIAS_DOMAINS
):
LOG.error("wrong alias suffix %s, user %s", alias_suffix, user)
return False
else:
if alias_domain not in user_custom_domains:
LOG.error("wrong alias suffix %s, user %s", alias_suffix, user)
return False
else:
if not alias_suffix.startswith("."):
LOG.error("User %s submits a wrong alias suffix %s", user, alias_suffix)
return False
full_alias = alias_prefix + alias_suffix
if not email_belongs_to_alias_domains(full_alias):
LOG.error(
"Alias suffix should end with one of the alias domains %s",
user,
alias_suffix,
)
return False
random_word_part = alias_suffix[1 : alias_suffix.find("@")]
if not word_exist(random_word_part):
LOG.error(
"alias suffix %s needs to start with a random word, user %s",
alias_suffix,
user,
)
return False
return True