Fixes 8 real issues found during a thorough review of the broadcast
feature (PRs #21-#29).
Security
* Webhook POSTs had zero spoof protection. Anyone could forge a
status update and drift broadcast counts arbitrarily. Added
HMAC-SHA256 signature verification via the X-Hub-Signature-256
header (Meta's standard). New helper src/lib/whatsapp/webhook-
signature.ts with timing-safe comparison. Rollout fails open
with a warning when META_APP_SECRET is unset so existing
deploys don't break at rollout; set the env var to enforce.
Correctness
* CSV audience was completely broken — synthesized "csv-N" strings
as contact_id, which failed the UUID cast on insert. Every CSV
broadcast silently created zero recipients. Replaced with a
real find-or-create against the contacts table (batched lookup
by phone, single INSERT for missing rows, de-duplicates CSV
inputs). CSV contacts now end up as real contacts.rows with
real UUIDs flowing through the rest of the pipeline.
* Recipient insert errors were logged with console.error and the
loop marched on — broadcasts then ran with incomplete recipient
sets, webhook updates couldn't find rows, and aggregate counts
drifted. Now: on batch insert failure, flip the broadcast to
failed + failed_count=total + throw so handleSend's toast fires.
* Webhook status guard ordered "failed" above "replied", which
meant a webhook replay delivering "failed" for an already-
replied recipient would upgrade replied → failed. Split the
ladder: forward-only ordering across pending → sent →
delivered → read → replied; failed is a terminal side branch
that can only be reached from pending or sent (never from any
success state). Net effect: a message that was read can no
longer regress to failed on a replay.
* Template sync only pulled page 1 (ignored paging.next). Users
with >100 templates silently missed some, and broadcasts with
those names failed with Meta's "template not found". Now
follows paging.next with a 20-page safety cap, reports
truncated=true in the response if hit.
* Template sync reported success:true even when individual
upserts failed. Now accumulates per-template errors and
surfaces them via a separate toast.error in the UI — green
toast no longer hides silent drift.
Performance
* Migration 005: replace the broadcast_recipients aggregate
trigger installed in migration 003. Old version ran
COUNT(*) FILTER on every row change — O(n²) across a send
loop (10k recipients × 10k index scans). New version
increments / decrements by ±1 per status transition: O(1)
per change. Kept the old recompute_broadcast_counts() as a
callable safety-net in case of drift.
* List page poll kept running while the tab was hidden. Added
visibilitychange handler — polling pauses when hidden,
resumes (and does an immediate fetch) on refocus.
UX
* Step 3 (Personalize) let users skip past unmapped placeholders
→ broadcasts then sent to Meta with empty-string params.
Next is now disabled until every {{N}} has a value; an amber
warning lists the missing placeholders.
Documented accepted risks in the PR body.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Stacked on PR B (#22). Merge A → B → C in order.
Step 2 — Audience
- Implement the "Custom Field" audience option (was a stub): field
picker + operator (is / is not / contains) + value input. Estimated
count query joins contact_custom_values with the operator mapped
to eq / neq / ilike. PostgREST ilike handles "contains" case-
insensitively.
- New "Exclude contacts with these tags" section — applies to every
audience type. Estimated count subtracts excluded contacts
client-side against the resolved base set.
- Switching audience type clears stale shape fields (tagIds /
customField / csvContacts) so old selections don't leak across.
Step 3 — Personalize
- Add "Custom Field" mapping option alongside static + contact field.
- Live Preview now pulls the most recent real contact (+ their custom
values) instead of hard-coded sample data. Falls back to sample if
the user has no contacts yet. Rendered in a WhatsApp-style bubble
so the user gets a realistic feel for how the recipient sees it.
Hook — use-broadcast-sending
- AudienceConfig gains customField + excludeTagIds.
- resolveAudience: custom-field branch + exclude-tag subtraction
applied after the base resolution (works for all / tags / custom
field).
- resolveVariables accepts a pre-built (fieldId → value) map per
contact. Before the send loop we bulk-fetch contact_custom_values
for all resolved contacts in one query (paged by 500 for PostgREST
limits) so we never N+1 per recipient.
new/page.tsx — passes customField + excludeTagIds into the hook;
variables state widens to allow type='custom_field'.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
