215 lines
8.0 KiB
Python
215 lines
8.0 KiB
Python
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 app.config import (
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DISABLE_ALIAS_SUFFIX,
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ALIAS_DOMAINS,
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CUSTOM_ALIAS_SECRET,
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)
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from app.dashboard.base import dashboard_bp
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from app.email_utils import email_belongs_to_alias_domains
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from app.extensions import db
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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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def available_suffixes(user: User) -> [bool, str, str]:
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"""Return (is_custom_domain, alias-suffix, time-signed alias-suffix)"""
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user_custom_domains = [cd.domain for cd in user.verified_custom_domains()]
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# List of (is_custom_domain, alias-suffix, time-signed alias-suffix)
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suffixes = []
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# put custom domain first
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for alias_domain in user_custom_domains:
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suffix = "@" + alias_domain
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suffixes.append((True, suffix, signer.sign(suffix).decode()))
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# then default domain
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for domain in ALIAS_DOMAINS:
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suffix = ("" if DISABLE_ALIAS_SUFFIX else "." + random_word()) + "@" + domain
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suffixes.append((False, suffix, signer.sign(suffix).decode()))
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return suffixes
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@dashboard_bp.route("/custom_alias", methods=["GET", "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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# List of (is_custom_domain, alias-suffix, time-signed alias-suffix)
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suffixes = available_suffixes(current_user)
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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()
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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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# 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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if (
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Alias.get_by(email=full_alias)
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or DeletedAlias.get_by(email=full_alias)
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or DomainDeletedAlias.get_by(email=full_alias)
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):
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LOG.d("full alias already used %s", full_alias)
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flash(
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f"Alias {full_alias} already exists, please choose another one",
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"warning",
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)
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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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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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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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mailboxes=mailboxes,
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)
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def verify_prefix_suffix(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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alias_prefix = alias_prefix.strip()
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alias_prefix = convert_to_id(alias_prefix)
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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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if alias_suffix.startswith("@"):
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alias_domain = alias_suffix[1:]
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# alias_domain can be either custom_domain or if DISABLE_ALIAS_SUFFIX, one of the default ALIAS_DOMAINS
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if DISABLE_ALIAS_SUFFIX:
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if (
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alias_domain not in user_custom_domains
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and alias_domain not in ALIAS_DOMAINS
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):
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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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else:
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if alias_domain not in user_custom_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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else:
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if not alias_suffix.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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full_alias = alias_prefix + alias_suffix
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if not email_belongs_to_alias_domains(full_alias):
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LOG.exception(
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"Alias suffix should end with one of the alias domains %s",
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user,
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alias_suffix,
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)
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return False
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random_word_part = alias_suffix[1 : alias_suffix.find("@")]
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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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return True
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