Closes#574.
Reporter (@blazmaric) identified the root cause cleanly:
express-validator's `.normalizeEmail()` applies provider-specific
canonicalization by default — Gmail dot-stripping, +tag stripping,
googlemail → gmail folding, etc. That's wrong for identity: PicPeak
uses email as a login identifier, so `john.doe@gmail.com` getting
silently stored as `johndoe@gmail.com` means the user can't log in
with the address they were invited with.
The bug existed at 17 call sites across the codebase (auth, admin user
create/update, customer create/update, event create/update on three
different routes, customer login, feedback submission). All of them
are identity-bearing — none had a legitimate reason to strip dots
for deduplication.
Fix: introduce one shared options object in `utils/emailNormalization`
disabling every provider-specific normalization
(gmail_remove_dots, gmail_remove_subaddress,
gmail_convert_googlemaildotcom, outlookdotcom_remove_subaddress,
yahoo_remove_subaddress, icloud_remove_subaddress). The only default
left enabled is `all_lowercase`, which is safe — local-parts are
case-insensitive in practice on every major provider, and lowercasing
keeps login lookup consistent.
Every call site updated to pass the shared options. 7 unit tests pin
the preserved-dots, preserved-subaddress, preserved-googlemail-domain,
and still-lowercase behaviours so a future refactor can't silently
regress.
## Migration note
Existing accounts whose emails were already stripped before this fix
remain with the stripped form in the DB. The fix takes effect for new
invitations going forward. If an admin re-invites an existing user
with the un-stripped address, that would create a duplicate account —
out of scope here; if it becomes a real problem we can add a
backward-compat login fallback (try lookup with dot-stripped form too)
as a separate change.
Paul Nothaft