Add proper email notifications

.dockerignore

@@ -0,0 +1,50 @@
+# Keep the image lean and reproducible: don't ship anything we'd regenerate
+# inside the container anyway, and never ship host-only / secret state.
+
+# Host venv -- container has its own Python install.
+.venv/
+
+# VCS metadata.
+.git/
+.gitignore
+.gitattributes
+
+# Local databases / dev artefacts.
+*.sqlite3
+db.sqlite3*
+__pycache__/
+*.py[cod]
+*.swp
+*.log
+*.tmp
+
+# Secrets / env files: container reads .env via --env-file or compose env_file:.
+.env
+.env.local
+
+# Tailwind binary cache: re-downloaded by `manage.py tailwind build` during
+# image build, then removed in the same layer. Host copy might be a different
+# arch / version, so always skip it.
+.django_tailwind_cli/
+
+# Output of `collectstatic` -- the Containerfile runs this fresh at build time.
+staticfiles/
+
+# Documentation, design assets, and prototype HTML that operators don't need
+# at runtime.
+demo/
+plan.md
+plan.pdf
+plan.html
+CLAUDE.md
+CONTRIBUTING.md
+README.md
+.claude/
+
+# IDE / cache directories.
+.vscode/
+.idea/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+node_modules/

.env.example

@@ -9,6 +9,11 @@ SECRET_KEY=replace-me-with-a-long-random-string
 DEBUG=true
 ALLOWED_HOSTS=localhost,127.0.0.1
 
+# Public base URL used in outgoing emails (confirmation link, detail-page
+# link). Defaults to http://localhost:8000 if unset. In production set to
+# e.g. https://print.hamlab.lt -- no trailing slash.
+SITE_URL=http://localhost:8000
+
 # --- PostgreSQL ---
 # Used by the `db` container and interpolated into DATABASE_URL inside
 # compose.yaml; the `web` container reads DATABASE_URL via dj-database-url.
@@ -16,15 +21,20 @@ POSTGRES_DB=hamprint
 POSTGRES_USER=hamprint
 POSTGRES_PASSWORD=changeme
 
-# --- Mailjet (transactional email) ---
+# --- Mailtrap (transactional email) ---
-# Only used when running with `hamprint.settings.prod`; `hamprint.settings.dev`
+# When MAILTRAP_API_TOKEN is set, Django sends through Mailtrap's HTTPS API
-# overrides EMAIL_BACKEND to the console backend so emails are printed to
+# via django-anymail. When blank, settings/base.py falls back to the console
-# the `web` container logs.
+# email backend -- handy for local development without burning real quota or
-# Get keys at https://app.mailjet.com/account/apikeys
+# spamming real addresses.
-MAILJET_API_KEY=
+# Get a token at https://mailtrap.io/api-tokens
-MAILJET_API_SECRET=
+MAILTRAP_API_TOKEN=
 DEFAULT_FROM_EMAIL=hamprint <noreply@hamlab.lt>
 
+# Optional: set to a Mailtrap testing-inbox ID to capture outgoing mail in a
+# sandbox inbox instead of actually delivering it. Find the ID in the URL
+# of the inbox at https://mailtrap.io/inboxes. Leave blank for real sending.
+MAILTRAP_TEST_INBOX_ID=
+
 # --- Google OAuth (django-allauth Google provider) ---
 # Configure at https://console.cloud.google.com/apis/credentials and add a
 # SocialApp via Django admin (/admin/socialaccount/socialapp/add/).

Containerfile

@@ -0,0 +1,62 @@
+# hamprint -- single-container image (plan.md §10).
+#
+# Runs Gunicorn plus the two periodic jobs (process_submissions every 30 s,
+# cleanup_stale every 5 min) in the same process group. No sidecars.
+#
+# Build:    podman build -t hamprint:latest .
+# Run:      podman run --rm -p 8000:8000 --env-file .env hamprint:latest
+#
+# In production the host typically mounts a volume at /app/media so uploaded
+# STLs survive container restarts; the database connection comes from
+# DATABASE_URL (Postgres in prod, SQLite if you really want).
+
+FROM docker.io/library/python:3.14-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    PIP_NO_CACHE_DIR=1 \
+    DJANGO_SETTINGS_MODULE=hamprint.settings.prod
+
+WORKDIR /app
+
+# System packages python:3.14-slim doesn't ship:
+#   tini    -- PID 1 for clean signal forwarding to gunicorn + the loops
+#   libgomp1 -- numpy/numpy-stl runtime on some kernels
+#   curl    -- handy for healthchecks if compose.yaml grows one
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends tini curl libgomp1 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Python deps as their own layer so app-code edits don't invalidate the wheel
+# cache. psycopg[binary] is added explicitly because requirements.txt is
+# kept Postgres-driver-agnostic for the host-venv (SQLite) path.
+COPY requirements.txt .
+RUN pip install -r requirements.txt 'psycopg[binary]'
+
+# Application code (.dockerignore excludes .venv, .git, db.sqlite3, demo/, etc).
+COPY . .
+
+# Build Tailwind CSS, gather everything under STATIC_ROOT for WhiteNoise, then
+# drop the ~120 MB Tailwind CLI download so it doesn't ride along. The source
+# .css lives at assets/tailwind.source.css (per TAILWIND_CLI_SRC_CSS in
+# settings/base.py); only the CLI binary cache is purged.
+RUN python manage.py tailwind build --force \
+    && python manage.py collectstatic --noinput \
+    && rm -rf /app/.django_tailwind_cli
+
+# Default writable dirs. Mount a volume at /app/media in prod for persistence.
+RUN mkdir -p /app/media /app/staticfiles
+
+# Drop privileges. uid 1000 maps cleanly to the typical host user in rootless
+# podman, so a bind-mounted media volume stays writable without extra fuss.
+RUN useradd -m -u 1000 app \
+    && chown -R app:app /app
+USER app
+
+EXPOSE 8000
+
+# tini reaps zombies + forwards SIGTERM to all children, so when the orchestrator
+# stops the container both Gunicorn AND the two background loops get the signal.
+ENTRYPOINT ["/usr/bin/tini", "--"]
+CMD ["bash", "entrypoint.sh"]

apps/accounts/urls.py

@@ -0,0 +1,14 @@
+"""Local additions under `/accounts/`. Mounted in `hamprint/urls.py` BEFORE
+`include("allauth.urls")` so any path defined here wins; everything we
+don't claim falls through to allauth.
+"""
+
+from django.urls import path
+
+from . import views
+
+app_name = "accounts"
+
+urlpatterns = [
+    path("close/", views.close_account, name="close"),
+]

apps/accounts/views.py

@@ -1,3 +1,68 @@
-from django.shortcuts import render
+"""Local account views -- the ones allauth doesn't ship.
 
-# Create your views here.
+Today: just `close_account` ("permanently delete this user"). Logout is
+allauth's; we override its template, not its view.
+"""
+
+from __future__ import annotations
+
+from django.contrib import messages
+from django.contrib.auth import logout
+from django.contrib.auth.decorators import login_required
+from django.db import transaction
+from django.http import HttpResponseForbidden
+from django.shortcuts import redirect, render
+from django.views.decorators.http import require_http_methods
+
+from apps.submissions.models import Submission
+
+
+@login_required
+@require_http_methods(["GET", "POST"])
+def close_account(request):
+    """Permanently delete the signed-in user and all of their submissions.
+
+    GET   -> render a "are you sure?" confirmation page, showing how many of
+             their submissions will go with the user.
+    POST  -> delete the rows, log the user out, redirect to the dashboard.
+
+    Refuses staff users (`is_staff=True`): they'd be locking themselves
+    (and possibly the only operator) out of /admin/ with no recourse, so
+    that path requires another operator to remove the row via
+    /admin/auth/user/ instead.
+
+    Why delete the submissions too: `Submission.submitted_by` uses
+    `on_delete=SET_NULL`, but the `CheckConstraint` on the model requires
+    that EITHER `submitted_by` OR `guest_email` is non-null. OAuth-created
+    submissions have `guest_email=NULL`, so SET_NULL would violate the
+    constraint at delete time. Simpler + matches user expectation of
+    "delete my account": wipe the rows wholesale. The `post_delete` signal
+    in `apps/submissions/signals.py` unlinks the uploaded STLs at the
+    same time.
+    """
+    if request.user.is_staff:
+        return HttpResponseForbidden(
+            "Staff users cannot close their own account from here. "
+            "Ask another operator to remove the row via /admin/auth/user/."
+        )
+
+    if request.method == "POST":
+        user = request.user
+        username = user.get_username()
+        with transaction.atomic():
+            Submission.objects.filter(submitted_by=user).delete()
+            logout(request)
+            user.delete()
+        messages.info(
+            request,
+            f"Account {username} and all of your prints have been "
+            f"permanently deleted.",
+        )
+        return redirect("dashboard:index")
+
+    submission_count = Submission.objects.filter(submitted_by=request.user).count()
+    return render(
+        request,
+        "account/close.html",
+        {"submission_count": submission_count},
+    )

apps/dashboard/urls.py

@@ -7,9 +7,9 @@ app_name = "dashboard"
 urlpatterns = [
     path("", views.IndexView.as_view(), name="index"),
     path("my-prints/", views.MyPrintsView.as_view(), name="my_prints"),
+    path("p/<slug:slug>/confirm/<str:token>/", views.ConfirmEmailView.as_view(), name="confirm"),
     # Routes to be added as features land (see plan.md Section 7):
     # path("p/<slug:slug>/", views.SubmissionDetailView.as_view(), name="detail"),
     # path("p/<slug:slug>/status/", views.SubmissionStatusFragment.as_view(), name="status"),
-    # path("p/<slug:slug>/confirm/<str:token>/", views.ConfirmEmailView.as_view(), name="confirm"),
     # path("p/<slug:slug>/resend/", views.ResendConfirmationView.as_view(), name="resend"),
 ]

apps/dashboard/views.py

@@ -1,5 +1,11 @@
+import secrets
+
+from django.contrib import messages
 from django.contrib.auth.mixins import LoginRequiredMixin
 from django.db.models import Count, Q
+from django.shortcuts import get_object_or_404, redirect
+from django.utils.html import format_html
+from django.views import View
 from django.views.generic import ListView
 
 from apps.submissions.models import Submission
@@ -54,6 +60,76 @@ class IndexView(ListView):
         return ctx
 
 
+class ConfirmEmailView(View):
+    """Email-confirmation landing page (plan.md §7.4 step 8).
+
+    The URL `/p/<slug>/confirm/<token>/` is what the welcome email's button
+    points at. Hitting it does plan.md §7.3's `identifying -> processing`
+    transition (`email_confirmed = True`, `confirmation_token` cleared),
+    then bounces the user back to the dashboard with a green notice. The
+    `processing` worker (plan.md §7.5) picks the row up within ~30 s and
+    moves it to `verifying`, where it becomes visible on the public list.
+
+    Idempotent: hitting the link twice (or after expiry / approval / rejection)
+    doesn't crash -- it just surfaces a neutral "already past the
+    confirmation step" notice and redirects. Constant-time string compare
+    on the token, so a stranger guessing tokens can't sniff prefix matches
+    via response-time differences.
+    """
+
+    def get(self, request, slug, token):
+        # 404 if the row doesn't exist -- including the case where
+        # cleanup_stale has already nuked an unconfirmed submission.
+        sub = get_object_or_404(Submission, slug=slug)
+
+        if sub.status != Submission.Status.IDENTIFYING:
+            # Already past the confirmation step -- treat as a no-op rather
+            # than an error so refreshing / re-clicking is harmless.
+            messages.info(
+                request,
+                format_html(
+                    "Submission <strong class=\"font-mono\">{slug}</strong> is "
+                    "already past the confirmation step (current state: "
+                    "<em>{status}</em>). Nothing more to do.",
+                    slug=sub.slug,
+                    status=sub.get_status_display(),
+                ),
+            )
+            return redirect("dashboard:index")
+
+        # Constant-time compare on the token to make timing-side-channel
+        # attacks against the 32-byte secret impractical.
+        stored = sub.confirmation_token or ""
+        if not stored or not secrets.compare_digest(stored, token):
+            messages.error(
+                request,
+                format_html(
+                    "Couldn't confirm submission <strong class=\"font-mono\">{slug}</strong> &mdash; "
+                    "the link is invalid or has expired. If you submitted "
+                    "this print, please <a href=\"{submit_url}\" class=\"underline font-medium\">"
+                    "submit again</a>.",
+                    slug=sub.slug,
+                    submit_url="/submit/",
+                ),
+            )
+            return redirect("dashboard:index")
+
+        sub.status = Submission.Status.PROCESSING
+        sub.email_confirmed = True
+        sub.confirmation_token = ""
+        sub.save()
+
+        messages.success(
+            request,
+            format_html(
+                "Submission <strong class=\"font-mono\">{slug}</strong> confirmed! "
+                "It'll appear on the dashboard shortly, after validation.",
+                slug=sub.slug,
+            ),
+        )
+        return redirect("dashboard:index")
+
+
 class MyPrintsView(LoginRequiredMixin, ListView):
     """Private listing -- every submission the signed-in user has ever made.
 

apps/submissions/emails.py

@@ -0,0 +1,129 @@
+"""Outgoing email -- plan.md §7 (state-transition side effects).
+
+Two public functions:
+
+  send_confirmation_email(submission)
+      Guest path: token-link emailed immediately after `SubmitView` creates
+      an `identifying` row. The user must click within 24 h (plan.md §7.6)
+      or the row is cleaned up.
+
+  send_status_update_email(submission, *, previous_status=None)
+      Generic notifier for any state transition the user should know about
+      (queued, rejected, completed, failed). Callers pick when to fire it
+      -- typically operator admin actions and the validation worker.
+
+Both delegate to Django's email machinery. The backend is wired in
+`hamprint/settings/base.py`: Mailtrap via `django-anymail` when
+`MAILTRAP_API_TOKEN` is present, console when not. Send failures are caught
++ logged so a flaky transport never blocks the submission flow.
+"""
+
+from __future__ import annotations
+
+import logging
+
+from django.conf import settings
+from django.core.mail import EmailMultiAlternatives
+from django.template.loader import render_to_string
+
+from .models import Submission
+
+logger = logging.getLogger(__name__)
+
+
+def _recipient(sub: Submission) -> str | None:
+    """Resolve the email address for a submission.
+
+    OAuth users -> `User.email`; guests -> `guest_email`. Returns None if
+    neither is set, which shouldn't happen thanks to the model's
+    `CheckConstraint` but we keep the belt-and-braces check anyway.
+    """
+    if sub.submitted_by_id and sub.submitted_by.email:
+        return sub.submitted_by.email
+    return sub.guest_email or None
+
+
+def _render(name: str, context: dict) -> tuple[str, str, str]:
+    """Load `templates/emails/{name}.subject.txt` + `.body.txt` + `.body.html`
+    and render each with the same context.
+
+    The subject is stripped of trailing whitespace so a multi-line subject
+    template (which can happen when an author hits Enter at the end) doesn't
+    accidentally include a newline -- which would make the transport API
+    reject the message as malformed.
+    """
+    subject = render_to_string(f"emails/{name}.subject.txt", context).strip()
+    body_text = render_to_string(f"emails/{name}.body.txt", context)
+    body_html = render_to_string(f"emails/{name}.body.html", context)
+    return subject, body_text, body_html
+
+
+def _send(name: str, sub: Submission, extra_context: dict) -> bool:
+    """Common send path. Builds a `multipart/alternative` message with both
+    the plain-text and HTML bodies attached so clients that don't render
+    HTML (or where the user has opted out) still see a readable email.
+    Returns True if the message was handed off to the transport backend
+    successfully, False on any failure (we never propagate)."""
+    to = _recipient(sub)
+    if not to:
+        logger.warning("no recipient for submission %s; skipping %s email", sub.slug, name)
+        return False
+    context = {
+        "submission": sub,
+        "site_url": settings.SITE_URL,
+        **extra_context,
+    }
+    subject, body_text, body_html = _render(name, context)
+    msg = EmailMultiAlternatives(
+        subject=subject,
+        body=body_text,                                  # text/plain root part
+        from_email=settings.DEFAULT_FROM_EMAIL,
+        to=[to],
+    )
+    msg.attach_alternative(body_html, "text/html")       # rich version
+    try:
+        msg.send()
+    except Exception:  # broad on purpose: transport-level surprises shouldn't crash callers
+        logger.exception("failed to send %s email for %s", name, sub.slug)
+        return False
+    logger.info("sent %s email for %s to %s", name, sub.slug, to)
+    return True
+
+
+def send_confirmation_email(sub: Submission) -> bool:
+    """Send the email-confirmation link to a guest submitter.
+
+    The URL is built by string concatenation rather than `reverse()` because
+    `dashboard:confirm` is currently scaffolded as a commented stub in
+    `apps/dashboard/urls.py` (plan.md §7). Once that route is wired,
+    switching to `reverse()` is a one-line change.
+    """
+    confirm_url = (
+        f"{settings.SITE_URL}/p/{sub.slug}/confirm/{sub.confirmation_token}/"
+    )
+    return _send("confirmation", sub, {"confirm_url": confirm_url})
+
+
+def send_status_update_email(
+    sub: Submission, *, previous_status: str | None = None
+) -> bool:
+    """Notify the submitter that their submission moved to a new state.
+
+    Pass `previous_status` so the email can render "was X, now Y" when
+    useful; omit it for first-time-ever notifications.
+    """
+    detail_url = f"{settings.SITE_URL}/p/{sub.slug}/"
+    return _send(
+        "status_update",
+        sub,
+        {"detail_url": detail_url, "previous_status": previous_status},
+    )
+
+
+def send_verifying_email(sub: Submission) -> bool:
+    """Notify the submitter that auto-validation passed (plan.md §7.3
+    `processing -> verifying` transition). The print is now queued for
+    a manual operator review; if the operator approves, the next email
+    will be the queued / printing one."""
+    detail_url = f"{settings.SITE_URL}/p/{sub.slug}/"
+    return _send("verifying", sub, {"detail_url": detail_url})

apps/submissions/management/commands/process_submissions.py

@@ -0,0 +1,80 @@
+"""`python manage.py process_submissions` -- implements plan.md §7.5.
+
+Drains one batch of submissions stuck in `processing`: validates each row's
+STL (uploads) or URL (printables / makerworld / thingiverse) and transitions
+to `verifying` on success or `rejected` on failure. Runs on a 30-second
+loop from the `web` container's entrypoint (plan.md §10) -- one invocation
+of this command per tick.
+
+Concurrency: `select_for_update(skip_locked=True)` keeps replicas / stray
+cron ticks / a re-entrant restart from grabbing the same row. On SQLite the
+locks are no-ops (dev only); Postgres in prod gets the non-blocking lock
+semantics the design assumes.
+"""
+
+from __future__ import annotations
+
+from django.core.management.base import BaseCommand
+from django.db import transaction
+from django.utils import timezone
+
+from apps.submissions.emails import send_status_update_email, send_verifying_email
+from apps.submissions.models import Submission
+from apps.submissions.validation import (
+    ValidationError,
+    validate_external_url,
+    validate_stl_file,
+)
+
+BATCH = 50
+
+
+class Command(BaseCommand):
+    help = (
+        "Drain submissions stuck in `processing` -- one batch per invocation. "
+        "Designed to be called on a loop from the web container entrypoint; "
+        "safe to also call ad-hoc for debugging."
+    )
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument(
+            "--batch",
+            type=int,
+            default=BATCH,
+            help=f"Max rows to process per invocation (default: {BATCH}).",
+        )
+
+    def handle(self, *args, batch: int, **opts) -> None:
+        with transaction.atomic():
+            # `list(...)` materialises the slice inside the transaction so
+            # subsequent `.save()` calls don't invalidate the queryset.
+            queue = list(
+                Submission.objects
+                .select_for_update(skip_locked=True)
+                .filter(status=Submission.Status.PROCESSING)
+                .order_by("updated_at")[:batch]
+            )
+
+            if not queue:
+                return
+
+            for sub in queue:
+                try:
+                    if sub.source_type == Submission.SourceType.UPLOAD:
+                        validate_stl_file(sub.stl_file.path)
+                    else:
+                        validate_external_url(sub.source_url, sub.source_type)
+                except ValidationError as exc:
+                    sub.status = Submission.Status.REJECTED
+                    sub.operator_notes = f"Automatic rejection: {exc}"
+                    sub.closed_at = timezone.now()
+                    # closed_by stays NULL -- the validator did the rejecting,
+                    # not an operator (plan.md §5 / §7.3).
+                    sub.save()
+                    send_status_update_email(sub, previous_status="processing")
+                    self.stdout.write(f"rejected  {sub.slug}: {exc}")
+                else:
+                    sub.status = Submission.Status.VERIFYING
+                    sub.save()
+                    send_verifying_email(sub)
+                    self.stdout.write(f"verifying {sub.slug}")

apps/submissions/models.py

@@ -8,6 +8,7 @@ from __future__ import annotations
 
 import uuid
 
+import namesgenerator
 from django.conf import settings
 from django.core.validators import FileExtensionValidator
 from django.db import models
@@ -178,6 +179,29 @@ class Submission(models.Model):
         # dashboard index so post-submit redirects always land somewhere real.
         return reverse("dashboard:index")
 
+    def save(self, *args, **kwargs):
+        """Auto-generate `slug` on first save so any creation path -- admin,
+        `SubmitView`, fixtures, `objects.create()` -- gets a Docker-style
+        codename without callers having to remember to set one."""
+        if not self.slug:
+            self.slug = self._generate_unique_slug()
+        super().save(*args, **kwargs)
+
+    @classmethod
+    def _generate_unique_slug(cls, max_attempts: int = 16) -> str:
+        """`namesgenerator.get_random_name` + collision retries in Python
+        (rather than a DB-side loop) so the rare collision path stays
+        observable. If the surrounding transaction still loses a race with
+        a concurrent insert, the DB's `unique=True` constraint fires an
+        `IntegrityError` and the caller can retry."""
+        for _ in range(max_attempts):
+            candidate = namesgenerator.get_random_name()
+            if not cls.objects.filter(slug=candidate).exists():
+                return candidate
+        # Fall through: extremely unlikely with the size of namesgenerator's
+        # adjective/surname space.
+        return namesgenerator.get_random_name()
+
     # --- presentation helpers (consumed by dashboard templates) -------------
 
     SOURCE_LABEL = {
@@ -201,6 +225,20 @@ class Submission(models.Model):
         Status.FAILED: "bg-red-100 text-red-800",
     }
 
+    # Same palette as STATUS_BADGE_CLASS but expressed as hex pairs because
+    # email clients strip <style> blocks and don't load external CSS, so the
+    # HTML email templates use inline `background-color` / `color`.
+    STATUS_EMAIL_COLORS = {
+        Status.IDENTIFYING: {"bg": "#fef3c7", "fg": "#92400e"},  # amber
+        Status.PROCESSING: {"bg": "#f1f5f9", "fg": "#334155"},   # slate
+        Status.VERIFYING: {"bg": "#ede9fe", "fg": "#5b21b6"},    # violet
+        Status.QUEUED: {"bg": "#dbeafe", "fg": "#1e40af"},       # blue
+        Status.PRINTING: {"bg": "#ffedd5", "fg": "#9a3412"},     # orange
+        Status.COMPLETED: {"bg": "#d1fae5", "fg": "#065f46"},    # emerald
+        Status.REJECTED: {"bg": "#fee2e2", "fg": "#991b1b"},     # red
+        Status.FAILED: {"bg": "#fee2e2", "fg": "#991b1b"},       # red
+    }
+
     @property
     def source_label(self) -> str:
         return self.SOURCE_LABEL.get(self.source_type, self.source_type)
@@ -208,3 +246,9 @@ class Submission(models.Model):
     @property
     def status_badge_class(self) -> str:
         return self.STATUS_BADGE_CLASS.get(self.status, "bg-slate-100 text-slate-700")
+
+    @property
+    def status_email_style(self) -> dict:
+        return self.STATUS_EMAIL_COLORS.get(
+            self.status, {"bg": "#f1f5f9", "fg": "#334155"}
+        )

apps/submissions/validation.py

@@ -0,0 +1,190 @@
+"""STL + URL validation for the `processing` worker (plan.md §7.5.2 / §7.5.3).
+
+Two public callables:
+
+  validate_stl_file(path)
+      Magic-byte probe + numpy-stl mesh load + bounding-box vs build plate +
+      triangle-count sanity. Raises `ValidationError` with the user-visible
+      reason on any rejection.
+
+  validate_external_url(url, source_type)
+      Host allow-list re-check + HEAD reachability (fallback to GET with a
+      Range header on 405). Raises `ValidationError` likewise.
+
+`numpy-stl` is imported lazily so this module can be imported on a host venv
+that hasn't run `pip install -r requirements.txt` yet -- the failure only
+fires when an STL is actually validated.
+"""
+
+from __future__ import annotations
+
+import struct
+from pathlib import Path
+from urllib.parse import urlparse
+
+import requests
+from django.conf import settings
+
+from .models import Submission
+
+
+class ValidationError(Exception):
+    """Raised when a Submission fails its validation pass. The message
+    becomes the operator-visible (and user-visible) rejection reason."""
+
+
+# Host allow-list per source_type. Mirrors `apps.submissions.forms`
+# deliberately rather than DRYing through a shared import: the
+# `processing` worker shouldn't be coupled to the form layer.
+_URL_HOSTS: dict[str, set[str]] = {
+    Submission.SourceType.PRINTABLES: {"printables.com", "www.printables.com"},
+    Submission.SourceType.MAKERWORLD: {"makerworld.com", "www.makerworld.com"},
+    Submission.SourceType.THINGIVERSE: {"thingiverse.com", "www.thingiverse.com"},
+}
+
+_MIN_AXIS_MM = 5.0
+_MIN_TRIANGLES = 4
+_MAX_TRIANGLES = 5_000_000
+
+# Be a polite citizen so anti-bot defenses on the model platforms don't 403 us.
+_HTTP_HEADERS = {
+    "User-Agent": "hamprint-validator/1.0 (+https://hamlab.lt)",
+}
+
+
+def _build_volume() -> tuple[float, float, float]:
+    """Read `PRINTER_BUILD_VOLUME_MM` (env-driven, default 235,235,250)."""
+    raw = getattr(settings, "PRINTER_BUILD_VOLUME_MM", "235,235,250")
+    parts = [float(x) for x in raw.split(",")]
+    if len(parts) != 3:
+        raise RuntimeError(
+            f"PRINTER_BUILD_VOLUME_MM must be 'x,y,z'; got: {raw!r}"
+        )
+    return parts[0], parts[1], parts[2]
+
+
+def _fmt(value: float) -> str:
+    """Render `235.0` as `235`, `235.5` as `235.5`. Just for clean error text."""
+    return str(int(value)) if value.is_integer() else f"{value:g}"
+
+
+# ---- STL ---------------------------------------------------------------------
+
+
+def validate_stl_file(path: str) -> None:
+    """Four-pass check; raises `ValidationError` on first failure."""
+    p = Path(path)
+    if not p.is_file():
+        raise ValidationError("STL file is missing on disk")
+
+    size = p.stat().st_size
+
+    # 1. Magic-byte / format probe.
+    with p.open("rb") as f:
+        head_80 = f.read(80)
+    if head_80.startswith(b"solid "):
+        # Could be ASCII -- but some binary STLs also start with "solid ".
+        # Confirm by looking for an ASCII facet marker in the first 4 KB.
+        with p.open("rb") as f:
+            first_4k = f.read(4096)
+        if b"facet normal" not in first_4k:
+            raise ValidationError(
+                "file is not a valid STL: header / size mismatch"
+            )
+        # ASCII STL accepted; the mesh load below catches anything subtler.
+    else:
+        # Binary STL: 80-byte header + uint32 triangle count + 50 B per tri.
+        with p.open("rb") as f:
+            f.seek(80)
+            tri_bytes = f.read(4)
+        if len(tri_bytes) != 4:
+            raise ValidationError(
+                "file is not a valid STL: header / size mismatch"
+            )
+        triangle_count = struct.unpack("<I", tri_bytes)[0]
+        if size != 84 + 50 * triangle_count:
+            raise ValidationError(
+                "file is not a valid STL: header / size mismatch"
+            )
+
+    # 2. Mesh load. Imported lazily so the module imports without numpy-stl.
+    try:
+        from stl import mesh  # type: ignore[import-not-found]
+    except ImportError as exc:  # pragma: no cover -- only hit on host venv
+        raise ValidationError(
+            "numpy-stl is not installed in this environment"
+        ) from exc
+    try:
+        m = mesh.Mesh.from_file(str(p))
+    except Exception:  # numpy-stl raises a variety of types; broad on purpose
+        raise ValidationError("STL could not be parsed")
+
+    # 3. Bounding-box check. mesh.vectors has shape (N, 3, 3).
+    vertices = m.vectors.reshape(-1, 3)
+    mins = vertices.min(axis=0)
+    maxs = vertices.max(axis=0)
+    extents = [float(maxs[i] - mins[i]) for i in range(3)]
+    bv_x, bv_y, bv_z = _build_volume()
+
+    if extents[0] > bv_x or extents[1] > bv_y or extents[2] > bv_z:
+        raise ValidationError(
+            f"part is {_fmt(extents[0])}x{_fmt(extents[1])}x{_fmt(extents[2])} mm; "
+            f"doesn't fit on our {_fmt(bv_x)}x{_fmt(bv_y)}x{_fmt(bv_z)} build plate"
+        )
+    if max(extents) < _MIN_AXIS_MM:
+        raise ValidationError(
+            f"part is too small to print reliably "
+            f"(under {_fmt(_MIN_AXIS_MM)} mm on every axis)"
+        )
+
+    # 4. Triangle-count sanity.
+    tri_count = int(len(m.vectors))
+    if tri_count < _MIN_TRIANGLES:
+        raise ValidationError(
+            f"mesh is degenerate (fewer than {_MIN_TRIANGLES} triangles)"
+        )
+    if tri_count > _MAX_TRIANGLES:
+        raise ValidationError(f"mesh is too dense ({tri_count:,} triangles)")
+
+
+# ---- URL ---------------------------------------------------------------------
+
+
+def validate_external_url(source_url: str, source_type: str) -> None:
+    """Host check + HEAD reachability; raises `ValidationError` on rejection."""
+    if not source_url:
+        raise ValidationError("URL is empty")
+
+    # 1. Host re-check. We already did this at form time but the row may have
+    # been edited via the admin since.
+    host = (urlparse(source_url).hostname or "").lower()
+    allowed = _URL_HOSTS.get(source_type, set())
+    if host not in allowed:
+        raise ValidationError("URL host doesn't match source type")
+
+    # 2. HEAD reachability.
+    try:
+        r = requests.head(
+            source_url,
+            timeout=5,
+            allow_redirects=True,
+            headers=_HTTP_HEADERS,
+        )
+        # Some CDNs refuse HEAD with 405; fall back to a tiny ranged GET.
+        if r.status_code == 405:
+            r = requests.get(
+                source_url,
+                timeout=5,
+                allow_redirects=True,
+                headers={**_HTTP_HEADERS, "Range": "bytes=0-1023"},
+            )
+    except requests.exceptions.RequestException as exc:
+        raise ValidationError(
+            f"URL unreachable ({exc.__class__.__name__})"
+        ) from exc
+
+    if r.status_code >= 400:
+        raise ValidationError(
+            f"URL returned HTTP {r.status_code}; the model may have been "
+            f"removed or set to private"
+        )

apps/submissions/views.py

@@ -1,4 +1,4 @@
-"""Submit form view (plan.md §7.4 + §7).
+"""Submit form view (plan.md §7.4).
 
 The view persists a `Submission` and, depending on whether the request is
 authenticated, sets the initial state machine state per plan.md §7.3:
@@ -6,40 +6,28 @@ authenticated, sets the initial state machine state per plan.md §7.3:
     OAuth user       -> processing  (email already verified)
     guest with email -> identifying (waiting for confirmation link click)
 
-Slug generation, email sending, and validation cron are out of scope here and
+For the guest path, the confirmation email is sent **synchronously** after
-deferred to plan.md §7.5 (`processor` sidecar) and §7.5 confirmation flow.
+the DB commit so we know the Mailtrap API outcome before redirecting. The
+dashboard then shows a green "check your inbox" notice on success or a red
+"couldn't send email -- try Google sign-in" notice on failure.
 """
 
 from __future__ import annotations
 
 import secrets
 
-import namesgenerator
 from django.contrib import messages
 from django.db import IntegrityError, transaction
-from django.urls import reverse_lazy
+from django.urls import reverse, reverse_lazy
 from django.utils import timezone
+from django.utils.html import format_html
 from django.views.generic import CreateView
 
+from .emails import send_confirmation_email
 from .forms import SubmissionForm
 from .models import Submission
 
 
-def _generate_unique_slug(max_attempts: int = 16) -> str:
-    """`namesgenerator.get_random_name` with collision retries.
-
-    The slug column is `unique=True`; we retry instead of looping in SQL so
-    the rare collision path stays observable.
-    """
-    for _ in range(max_attempts):
-        candidate = namesgenerator.get_random_name()
-        if not Submission.objects.filter(slug=candidate).exists():
-            return candidate
-    # Fall through: extremely unlikely, but caller will see IntegrityError
-    # if the next save() still collides.
-    return namesgenerator.get_random_name()
-
-
 class SubmitView(CreateView):
     """Public submit form. GET renders, POST creates a Submission."""
 
@@ -52,10 +40,12 @@ class SubmitView(CreateView):
         kwargs["user"] = self.request.user
         return kwargs
 
-    @transaction.atomic
     def form_valid(self, form):
         submission: Submission = form.save(commit=False)
-        submission.slug = _generate_unique_slug()
+        # The slug is auto-generated in `Submission.save()` if blank, so we
+        # don't need to set one here. The `except IntegrityError` below
+        # handles the rare race where the just-generated slug collides with
+        # a concurrent insert.
 
         if self.request.user.is_authenticated:
             submission.submitted_by = self.request.user
@@ -70,28 +60,65 @@ class SubmitView(CreateView):
             submission.status = Submission.Status.IDENTIFYING
             submission.confirmation_token = secrets.token_urlsafe(32)
             submission.confirmation_sent_at = timezone.now()
-            # TODO(plan.md §7.4 step 6): send the confirmation email here.
 
+        # Persist inside a tight atomic block so the row is committed BEFORE
+        # we hit the email transport. That way a slow / failing Mailtrap API
+        # call can never roll back a saved submission, and we get to look at
+        # the result and surface it as a user-visible notice.
+        with transaction.atomic():
             try:
                 submission.save()
             except IntegrityError:
-            # Extremely rare slug collision on the unique index; one more try.
+                # Extremely rare slug collision on the unique index; clearing
-            submission.slug = _generate_unique_slug()
+                # `slug` makes `Submission.save()` regenerate it on retry.
+                submission.slug = ""
                 submission.save()
 
+        self.object = submission
+
         if submission.status == Submission.Status.IDENTIFYING:
-            messages.info(
+            self._notify_guest(submission)
-                self.request,
-                f"Submission {submission.slug} created. Check your email "
-                f"({submission.guest_email}) for a confirmation link -- you "
-                f"have 24 hours.",
-            )
         else:
             messages.success(
                 self.request,
-                f"Submission {submission.slug} accepted. We'll start "
+                format_html(
-                f"validating it shortly.",
+                    "Submission <strong class=\"font-mono\">{}</strong> accepted. "
+                    "We'll start validating it shortly.",
+                    submission.slug,
+                ),
             )
 
-        self.object = submission
         return super().form_valid(form)
+
+    # ---- guest-path notice ---------------------------------------------------
+
+    def _notify_guest(self, submission: Submission) -> None:
+        """Send the confirmation email and surface success / failure to the
+        user via the messages framework. Green on 2xx from Mailtrap, red on
+        any transport failure (with a "sign in with Google instead" hint)."""
+        sent = send_confirmation_email(submission)
+        if sent:
+            messages.success(
+                self.request,
+                format_html(
+                    "Submission <strong class=\"font-mono\">{slug}</strong> created. "
+                    "We've sent a confirmation link to <strong>{email}</strong> &mdash; "
+                    "click it within 24 hours to add your print to the queue.",
+                    slug=submission.slug,
+                    email=submission.guest_email,
+                ),
+            )
+        else:
+            messages.error(
+                self.request,
+                format_html(
+                    "Submission <strong class=\"font-mono\">{slug}</strong> was saved, "
+                    "but we couldn't send the confirmation email to <strong>{email}</strong>. "
+                    "Try <a href=\"{login_url}\" class=\"underline font-medium\">"
+                    "signing in with Google</a> instead &mdash; it skips email "
+                    "confirmation entirely.",
+                    slug=submission.slug,
+                    email=submission.guest_email,
+                    login_url=reverse("account_login"),
+                ),
+            )

compose.dev.yaml

@@ -0,0 +1,55 @@
+# Podman / Docker Compose stack for local hamprint development.
+#
+# Bring it up:   podman-compose up -d   (or: docker compose up -d)
+# Logs:          podman-compose logs -f web
+# Tear down:     podman-compose down            (keeps the pgdata volume)
+#                podman-compose down -v         (drops the pgdata volume too)
+#
+# The `web` service uses a stock python:3.14-slim image and bind-mounts this
+# repo at /app. On every start it installs from requirements.txt plus
+# psycopg[binary] (the pip-cache volume makes subsequent starts fast) and
+# runs Django's dev server. There is intentionally no Containerfile yet --
+# swap `image:` for `build: .` once Section 10's image lands.
+
+services:
+  db:
+    image: docker.io/library/postgres:16
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
+    env_file: .env
+
+  web:
+    image: docker.io/library/python:3.14-slim
+    working_dir: /app
+    command: >
+      bash -c "
+        pip install --quiet --no-input -r requirements.txt 'psycopg[binary]' &&
+        python manage.py migrate --noinput &&
+        python manage.py runserver 0.0.0.0:8000
+      "
+    env_file: .env
+    environment:
+      DJANGO_SETTINGS_MODULE: hamprint.settings.dev
+      DATABASE_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
+    ports:
+      - "8000:8000"
+    volumes:
+      - .:/app:Z
+      - pipcache:/root/.cache/pip
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  pgdata:
+  pipcache:

compose.yaml

@@ -1,20 +1,39 @@
-# Podman / Docker Compose stack for local hamprint development.
+# Production compose stack for hamprint.
 #
-# Bring it up:   podman-compose up -d   (or: docker compose up -d)
+# What changed from the previous bind-mount / pip-at-runtime version:
+#   - `web` is now BUILT from the Containerfile in this repo. Everything
+#     (Python deps, the Tailwind CLI binary, the built CSS, collectstatic
+#     output) bakes into the image; nothing is installed at container start.
+#   - No host source bind-mount: the container ships its own /app. Code
+#     changes require a `podman-compose up -d --build web`.
+#   - `DJANGO_SETTINGS_MODULE=hamprint.settings.prod` (DEBUG off, secure
+#     cookies, HSTS). DEBUG=True traffic should run from the host venv,
+#     not from this stack.
+#   - Uploaded STLs persist in a named `media` volume so they survive
+#     `podman-compose down` / image rebuilds. Drop with `down -v`.
+#
+# Bring it up:        podman-compose up -d --build
+# Rebuild only web:   podman-compose up -d --build web
 # Logs:               podman-compose logs -f web
-# Tear down:     podman-compose down            (keeps the pgdata volume)
+# Tear down:          podman-compose down       # keeps pgdata + media
-#                podman-compose down -v         (drops the pgdata volume too)
+#                     podman-compose down -v    # nukes both volumes too
 #
-# The `web` service uses a stock python:3.14-slim image and bind-mounts this
+# `.env` keys you'll want set (see `.env.example` for the full list):
-# repo at /app. On every start it installs from requirements.txt plus
+#   SECRET_KEY            - long random string
-# psycopg[binary] (the pip-cache volume makes subsequent starts fast) and
+#   ALLOWED_HOSTS         - e.g. "print.hamlab.lt,localhost"
-# runs Django's dev server. There is intentionally no Containerfile yet --
+#   SITE_URL              - e.g. "https://print.hamlab.lt"   (for emails)
-# swap `image:` for `build: .` once Section 10's image lands.
+#   POSTGRES_DB / _USER / _PASSWORD
+#   MAILTRAP_API_TOKEN          (+ MAILTRAP_TEST_INBOX_ID for sandbox)
+#   GOOGLE_CLIENT_ID / _SECRET (optional; only if Google sign-in is wanted)
+#
+# TLS termination is the upstream proxy's job -- the `web` container speaks
+# plain HTTP on its mapped host port (default 8000).
 
 services:
   db:
     image: docker.io/library/postgres:16
     restart: unless-stopped
+    env_file: .env
     environment:
       POSTGRES_DB: ${POSTGRES_DB}
       POSTGRES_USER: ${POSTGRES_USER}
@@ -26,30 +45,24 @@ services:
       interval: 5s
       timeout: 3s
       retries: 10
-    env_file: .env
 
   web:
-    image: docker.io/library/python:3.14-slim
+    build:
-    working_dir: /app
+      context: .
-    command: >
+      dockerfile: Containerfile
-      bash -c "
+    restart: unless-stopped
-        pip install --quiet --no-input -r requirements.txt 'psycopg[binary]' &&
-        python manage.py migrate --noinput &&
-        python manage.py runserver 0.0.0.0:8000
-      "
     env_file: .env
     environment:
-      DJANGO_SETTINGS_MODULE: hamprint.settings.dev
+      DJANGO_SETTINGS_MODULE: hamprint.settings.prod
       DATABASE_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
     ports:
       - "8000:8000"
     volumes:
-      - .:/app:Z
+      - media:/app/media
-      - pipcache:/root/.cache/pip
     depends_on:
       db:
         condition: service_healthy
 
 volumes:
   pgdata:
-  pipcache:
+  media:

entrypoint.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# hamprint container entrypoint.
+#
+# Runs everything inside the single `web` container per plan.md §10:
+#   1. apply DB migrations (idempotent; runs on every start)
+#   2. background `process_submissions` (plan.md §7.5, 30 s loop)
+#   3. background `cleanup_stale`       (plan.md §7.6, 5 min loop)
+#   4. exec Gunicorn so it becomes the foreground process for signal handling
+#
+# tini (set as ENTRYPOINT in the Containerfile) reaps zombies and forwards
+# SIGTERM to all three child processes on container stop.
+
+set -euo pipefail
+
+python manage.py migrate --noinput
+
+# Validation worker. `|| true` keeps the loop alive across a transient
+# failure (e.g. a flaky external HEAD request); the next tick retries.
+(
+  while true; do
+    python manage.py process_submissions || true
+    sleep 30
+  done
+) &
+
+# Stale-row reaper. Same pattern, different cadence.
+(
+  while true; do
+    python manage.py cleanup_stale || true
+    sleep 300
+  done
+) &
+
+exec gunicorn hamprint.wsgi:application \
+    --bind 0.0.0.0:8000 \
+    --workers "${GUNICORN_WORKERS:-3}" \
+    --access-logfile - \
+    --error-logfile -

hamprint/settings/base.py

@@ -119,17 +119,38 @@ STORAGES = {
 
 DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
 
-# Email --- Mailjet via django-anymail. The env var name MAILJET_API_SECRET is
+# Email --- Mailtrap HTTPS API via django-anymail, with a console fallback so
-# mapped onto anymail's MAILJET_SECRET_KEY so our two env vars stay symmetrical.
+# a dev without credentials still sees emails in the runserver log instead of
-EMAIL_BACKEND = "anymail.backends.mailjet.EmailBackend"
+# crashing on send.
+#
+# If MAILTRAP_TEST_INBOX_ID is set, anymail routes to Mailtrap's sandbox
+# (testing inbox) instead of doing real delivery -- handy for staging.
+_mailtrap_token = env("MAILTRAP_API_TOKEN", default="")
+_mailtrap_test_inbox = env("MAILTRAP_TEST_INBOX_ID", default="")
+
+if _mailtrap_token:
+    EMAIL_BACKEND = "anymail.backends.mailtrap.EmailBackend"
     ANYMAIL = {
-    "MAILJET_API_KEY": env("MAILJET_API_KEY", default=""),
+        "MAILTRAP_API_TOKEN": _mailtrap_token,
-    "MAILJET_SECRET_KEY": env("MAILJET_API_SECRET", default=""),
     }
+    if _mailtrap_test_inbox:
+        ANYMAIL["MAILTRAP_TEST_INBOX_ID"] = _mailtrap_test_inbox
+        ANYMAIL["MAILTRAP_TESTING"] = True
+else:
+    EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
 DEFAULT_FROM_EMAIL = env(
     "DEFAULT_FROM_EMAIL", default="hamprint <noreply@hamlab.lt>"
 )
 
+# Public base URL used in outgoing emails (confirmation + status links).
+# Override in `.env` per environment; defaults to localhost for dev.
+SITE_URL = env("SITE_URL", default="http://localhost:8000").rstrip("/")
+
+# Printer build volume in mm, "x,y,z". Consumed by the STL bounding-box
+# pass in `apps.submissions.validation`. Default fits a Bambu A1 / Prusa
+# MK4 class machine. Override per-printer in `.env`.
+PRINTER_BUILD_VOLUME_MM = env("PRINTER_BUILD_VOLUME_MM", default="235,235,250")
+
 CRISPY_ALLOWED_TEMPLATE_PACKS = "tailwind"
 CRISPY_TEMPLATE_PACK = "tailwind"
 

hamprint/settings/dev.py

@@ -5,5 +5,6 @@ from .base import *  # noqa: F401, F403
 DEBUG = True
 ALLOWED_HOSTS = ["localhost", "127.0.0.1", "0.0.0.0"]
 
-# Print emails to the console in dev so we don't burn Mailjet quota.
+# Email backend is auto-detected in base.py: Mailtrap if MAILTRAP_API_TOKEN
-EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
+# is set in .env, otherwise the console backend. To force console output
+# even with a token set, clear MAILTRAP_API_TOKEN.

hamprint/urls.py

@@ -20,6 +20,10 @@ from django.urls import include, path
 
 urlpatterns = [
     path("admin/", admin.site.urls),
+    # Our local /accounts/ routes (close-account, etc.) come BEFORE allauth's
+    # include so they win on URL match. Everything we don't claim falls
+    # through to allauth.
+    path("accounts/", include("apps.accounts.urls")),
     path("accounts/", include("allauth.urls")),
     path("", include("apps.dashboard.urls")),
     path("submit/", include("apps.submissions.urls")),

requirements.txt

@@ -19,6 +19,7 @@ idna==3.14
 markdown-it-py==4.2.0
 mdurl==0.1.2
 namesgenerator==0.3
+numpy-stl>=3.0
 packaging==26.2
 pycparser==3.0
 Pygments==2.20.0

templates/account/close.html

@@ -0,0 +1,44 @@
+{% extends "base.html" %}
+
+{% block title %}Close your hamprint account{% endblock %}
+
+{% block content %}
+<div class="max-w-md mx-auto py-8">
+  <div class="bg-white border border-red-200 rounded-lg p-8 shadow-sm">
+    <h1 class="text-2xl font-bold tracking-tight text-red-700">Close your account</h1>
+    <p class="text-slate-700 mt-2 text-sm">
+      Signed in as
+      <span class="font-medium">{{ user.email|default:user.get_username }}</span>.
+      This action permanently deletes your account.
+    </p>
+
+    <div class="mt-4 rounded-md border border-red-200 bg-red-50 p-3 text-sm text-red-900">
+      <p class="font-semibold">There is no undo.</p>
+      <ul class="mt-2 list-disc pl-5 space-y-1">
+        <li>Your user row is deleted from the database.</li>
+        <li>
+          {% if submission_count == 0 %}
+            You don't have any prints in the system right now -- nothing else to remove.
+          {% elif submission_count == 1 %}
+            Your <strong>1</strong> print is deleted along with your account, including any uploaded STL.
+          {% else %}
+            All <strong>{{ submission_count }}</strong> of your prints are deleted along with your account, including any uploaded STLs.
+          {% endif %}
+        </li>
+        <li>Any active queue items are cancelled. Operators won't be able to contact you afterwards.</li>
+      </ul>
+    </div>
+
+    <form method="post" class="mt-6">
+      {% csrf_token %}
+      <button type="submit" class="w-full px-4 py-3 rounded-md bg-red-600 text-white hover:bg-red-700 font-medium">
+        Yes, delete my account permanently
+      </button>
+    </form>
+
+    <div class="mt-4 text-center">
+      <a href="{% url 'dashboard:my_prints' %}" class="text-sm text-slate-600 hover:underline">← Cancel, take me back</a>
+    </div>
+  </div>
+</div>
+{% endblock %}

templates/account/logout.html

@@ -0,0 +1,27 @@
+{% extends "base.html" %}
+
+{% block title %}Sign out — hamprint{% endblock %}
+
+{% block content %}
+<div class="max-w-md mx-auto py-8">
+  <div class="bg-white border border-slate-200 rounded-lg p-8 shadow-sm">
+    <h1 class="text-2xl font-bold tracking-tight">Sign out?</h1>
+    <p class="text-slate-600 mt-2 text-sm">
+      You're signed in as
+      <span class="font-medium">{{ user.email|default:user.get_username }}</span>.
+      Your prints stay on the dashboard either way -- you can come back any time.
+    </p>
+
+    <form method="post" action="{% url 'account_logout' %}" class="mt-6">
+      {% csrf_token %}
+      <button type="submit" class="w-full px-4 py-3 rounded-md bg-amber-500 text-white hover:bg-amber-600 font-medium">
+        Sign me out
+      </button>
+    </form>
+
+    <div class="mt-4 text-center">
+      <a href="{% url 'dashboard:my_prints' %}" class="text-sm text-slate-600 hover:underline">← Back to my prints</a>
+    </div>
+  </div>
+</div>
+{% endblock %}

templates/base.html

@@ -44,6 +44,26 @@
 </nav>
 
 <main class="mx-auto max-w-6xl px-4 py-8">
+  {% if messages %}
+    {% comment %}
+      One styled card per Django messages.add_message() call. The text is
+      rendered via {{ message|safe }} so that callers that built their
+      string with django.utils.html.format_html() can include <a>/<strong>
+      markup (variables are auto-escaped by format_html).
+    {% endcomment %}
+    <div class="mb-6 space-y-2">
+      {% for message in messages %}
+        <div class="px-4 py-3 rounded-md border text-sm
+                    {% if 'success' in message.tags %}border-emerald-200 bg-emerald-50 text-emerald-900
+                    {% elif 'error' in message.tags %}border-red-200 bg-red-50 text-red-900
+                    {% elif 'warning' in message.tags %}border-amber-200 bg-amber-50 text-amber-900
+                    {% else %}border-slate-200 bg-slate-50 text-slate-700{% endif %}">
+          {{ message|safe }}
+        </div>
+      {% endfor %}
+    </div>
+  {% endif %}
+
   {% block content %}{% endblock %}
 </main>
 

templates/dashboard/my_prints.html

@@ -80,6 +80,11 @@
 
 <div class="mt-6 flex items-center justify-between text-sm">
   <a href="{% url 'submissions:create' %}" class="text-amber-700 hover:underline font-medium">+ Submit another print</a>
+  <div class="flex items-center gap-4">
+    {% if not user.is_staff %}
+      <a href="{% url 'accounts:close' %}" class="text-red-600 hover:underline">Close account</a>
+    {% endif %}
     <a href="{% url 'account_logout' %}" class="text-slate-500 hover:underline">Sign out</a>
   </div>
+</div>
 {% endblock %}

templates/emails/_base.html

@@ -0,0 +1,70 @@
+{# Base email shell. Child templates fill {% block body %}{% endblock %}. #}
+{# Inline styles only -- most clients strip <style> tags or block CDNs. #}
+{# Table-based layout -- Outlook/Windows Mail still rely on it for spacing. #}
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="color-scheme" content="light">
+<meta name="supported-color-schemes" content="light">
+<title>hamprint</title>
+</head>
+<body style="margin:0; padding:0; background-color:#f8fafc; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif; color:#0f172a; -webkit-font-smoothing:antialiased;">
+
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" width="100%" style="background-color:#f8fafc;">
+  <tr>
+    <td align="center" style="padding:32px 16px;">
+
+      <table role="presentation" cellpadding="0" cellspacing="0" border="0" width="560" style="max-width:560px; width:100%; background-color:#ffffff; border:1px solid #e2e8f0; border-radius:8px; box-shadow:0 1px 2px rgba(15,23,42,0.04);">
+
+        <!-- Header -->
+        <tr>
+          <td style="padding:20px 28px; border-bottom:1px solid #e2e8f0;">
+            <table role="presentation" cellpadding="0" cellspacing="0" border="0">
+              <tr>
+                <td style="padding-right:10px;">
+                  <table role="presentation" cellpadding="0" cellspacing="0" border="0" width="32" height="32" style="background-color:#f59e0b; border-radius:6px;">
+                    <tr>
+                      <td align="center" valign="middle" height="32" style="color:#ffffff; font-weight:700; font-size:18px; line-height:1; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">h</td>
+                    </tr>
+                  </table>
+                </td>
+                <td style="vertical-align:middle;">
+                  <span style="font-weight:700; font-size:18px; color:#0f172a; letter-spacing:-0.01em;">hamprint</span>
+                  <span style="font-size:12px; color:#64748b; margin-left:4px;">· hamlab.lt</span>
+                </td>
+              </tr>
+            </table>
+          </td>
+        </tr>
+
+        <!-- Body -->
+        <tr>
+          <td style="padding:28px;">
+            {% block body %}{% endblock %}
+          </td>
+        </tr>
+
+        <!-- Footer -->
+        <tr>
+          <td style="padding:16px 28px; border-top:1px solid #e2e8f0; background-color:#f8fafc; border-bottom-left-radius:8px; border-bottom-right-radius:8px;">
+            <p style="margin:0; font-size:12px; color:#64748b; text-align:center;">
+              A community service of <a href="https://hamlab.lt" style="color:#475569; font-weight:500; text-decoration:none;">hamlab.lt</a>.
+            </p>
+          </td>
+        </tr>
+
+      </table>
+
+      <!-- Plain-text footnote that still degrades nicely in dark-mode clients -->
+      <p style="margin:16px 0 0 0; font-size:12px; color:#94a3b8; text-align:center; max-width:560px;">
+        You're receiving this because you submitted a print at hamprint.
+      </p>
+
+    </td>
+  </tr>
+</table>
+
+</body>
+</html>

templates/emails/confirmation.body.html

@@ -0,0 +1,39 @@
+{% extends "emails/_base.html" %}
+{% block body %}
+<h1 style="margin:0 0 12px 0; font-size:22px; font-weight:700; color:#0f172a; letter-spacing:-0.01em;">Confirm your submission</h1>
+
+<p style="margin:0 0 18px 0; color:#334155; font-size:15px; line-height:1.55;">
+  You submitted a 3D print to hamlab.lt. Your codename is:
+</p>
+
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" width="100%" style="margin:0 0 22px 0;">
+  <tr>
+    <td style="padding:12px 16px; background-color:#fef3c7; border-radius:6px; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:18px; font-weight:700; color:#92400e;">
+      {{ submission.slug }}
+    </td>
+  </tr>
+</table>
+
+<p style="margin:0 0 24px 0; color:#334155; font-size:15px; line-height:1.55;">
+  To put it in the queue, click the button below within <strong style="color:#0f172a;">24 hours</strong>. Otherwise the submission (and any uploaded <span style="font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;">.stl</span>) is deleted automatically.
+</p>
+
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" style="margin:0 0 24px 0;">
+  <tr>
+    <td style="background-color:#f59e0b; border-radius:6px;">
+      <a href="{{ confirm_url }}" style="display:inline-block; padding:12px 24px; color:#ffffff; font-weight:600; font-size:15px; text-decoration:none; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
+        Confirm my submission
+      </a>
+    </td>
+  </tr>
+</table>
+
+<p style="margin:0 0 4px 0; font-size:13px; color:#64748b;">Or copy this link into your browser:</p>
+<p style="margin:0 0 24px 0; font-size:13px; color:#475569; word-break:break-all; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;">{{ confirm_url }}</p>
+
+<hr style="margin:0 0 18px 0; border:none; border-top:1px solid #e2e8f0;">
+
+<p style="margin:0; font-size:13px; color:#64748b; line-height:1.55;">
+  If you didn't submit this, you can safely ignore the email — nothing happens until you click the link.
+</p>
+{% endblock %}

templates/emails/confirmation.body.txt

@@ -0,0 +1,16 @@
+Hi,
+
+You submitted a 3D print to hamlab.lt. Your codename is:
+
+    {{ submission.slug }}
+
+To put it in the queue, click the link below within 24 hours. If you don't,
+the submission (and any uploaded .stl) will be deleted automatically.
+
+    {{ confirm_url }}
+
+If you didn't submit this, you can safely ignore this email -- nothing
+happens until you click the link.
+
+— hamprint
+{{ site_url }}

templates/emails/confirmation.subject.txt

@@ -0,0 +1 @@
+Confirm your hamprint submission: {{ submission.slug }}

templates/emails/status_update.body.html

@@ -0,0 +1,55 @@
+{% extends "emails/_base.html" %}
+{% block body %}
+<h1 style="margin:0 0 12px 0; font-size:22px; font-weight:700; color:#0f172a; letter-spacing:-0.01em;">Status update</h1>
+
+<p style="margin:0 0 16px 0; color:#334155; font-size:15px; line-height:1.55;">
+  Your submission <strong style="font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; color:#92400e; font-weight:700;">{{ submission.slug }}</strong> has moved to:
+</p>
+
+{% comment %}
+  Status pill -- per-status hex colours from `Submission.STATUS_EMAIL_COLORS`.
+  Wrapped in a table so Outlook respects padding + border-radius.
+{% endcomment %}
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" style="margin:0 0 20px 0;">
+  <tr>
+    <td style="padding:6px 14px; background-color:{{ submission.status_email_style.bg }}; border-radius:9999px;">
+      <span style="color:{{ submission.status_email_style.fg }}; font-weight:600; font-size:14px; letter-spacing:0.01em;">
+        {{ submission.get_status_display }}
+      </span>
+    </td>
+  </tr>
+</table>
+
+{% if previous_status %}
+<p style="margin:0 0 20px 0; font-size:13px; color:#64748b;">
+  Previously: <span style="color:#475569;">{{ previous_status }}</span>
+</p>
+{% endif %}
+
+{% if submission.operator_notes %}
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" width="100%" style="margin:0 0 24px 0;">
+  <tr>
+    <td style="padding:16px; background-color:#f8fafc; border-left:3px solid #f59e0b; border-radius:0 4px 4px 0;">
+      <p style="margin:0 0 6px 0; font-size:11px; font-weight:600; color:#64748b; text-transform:uppercase; letter-spacing:0.06em;">
+        Note from the operator
+      </p>
+      <p style="margin:0; color:#334155; font-size:14px; line-height:1.55; white-space:pre-line;">{{ submission.operator_notes }}</p>
+    </td>
+  </tr>
+</table>
+{% endif %}
+
+<table role="presentation" cellpadding="0" cellspacing="0" border="0">
+  <tr>
+    <td style="background-color:#f59e0b; border-radius:6px;">
+      <a href="{{ detail_url }}" style="display:inline-block; padding:12px 24px; color:#ffffff; font-weight:600; font-size:15px; text-decoration:none; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
+        View submission
+      </a>
+    </td>
+  </tr>
+</table>
+
+<p style="margin:18px 0 0 0; font-size:13px; color:#64748b;">
+  Direct link: <span style="color:#475569; word-break:break-all; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;">{{ detail_url }}</span>
+</p>
+{% endblock %}

templates/emails/status_update.body.txt

@@ -0,0 +1,16 @@
+Hi,
+
+Your hamprint submission "{{ submission.slug }}" has moved to:
+
+    {{ submission.get_status_display }}{% if previous_status %} (was: {{ previous_status }}){% endif %}
+
+{% if submission.operator_notes %}A note from the operator:
+
+    {{ submission.operator_notes }}
+
+{% endif %}You can see the latest state at:
+
+    {{ detail_url }}
+
+— hamprint
+{{ site_url }}

templates/emails/status_update.subject.txt

@@ -0,0 +1 @@
+hamprint update: {{ submission.slug }} is now {{ submission.get_status_display }}

templates/emails/verifying.body.html

@@ -0,0 +1,37 @@
+{% extends "emails/_base.html" %}
+{% block body %}
+<h1 style="margin:0 0 12px 0; font-size:22px; font-weight:700; color:#0f172a; letter-spacing:-0.01em;">Cleared auto-checks</h1>
+
+<p style="margin:0 0 16px 0; color:#334155; font-size:15px; line-height:1.55;">
+  Your submission <strong style="font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; color:#92400e; font-weight:700;">{{ submission.slug }}</strong> passed our automated checks (size, format, host allow-list) and is now waiting for an operator to take a manual look.
+</p>
+
+{# Pill colours come from `Submission.STATUS_EMAIL_COLORS` -- same per-status palette as the website badge. #}
+<table role="presentation" cellpadding="0" cellspacing="0" border="0" style="margin:0 0 20px 0;">
+  <tr>
+    <td style="padding:6px 14px; background-color:{{ submission.status_email_style.bg }}; border-radius:9999px;">
+      <span style="color:{{ submission.status_email_style.fg }}; font-weight:600; font-size:14px; letter-spacing:0.01em;">
+        {{ submission.get_status_display }}
+      </span>
+    </td>
+  </tr>
+</table>
+
+<p style="margin:0 0 24px 0; color:#334155; font-size:15px; line-height:1.55;">
+  If the operator is happy with the print job, it moves into the print queue shortly after &mdash; and we'll email you again once that happens. You don't need to do anything right now.
+</p>
+
+<table role="presentation" cellpadding="0" cellspacing="0" border="0">
+  <tr>
+    <td style="background-color:#f59e0b; border-radius:6px;">
+      <a href="{{ detail_url }}" style="display:inline-block; padding:12px 24px; color:#ffffff; font-weight:600; font-size:15px; text-decoration:none; font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;">
+        View submission
+      </a>
+    </td>
+  </tr>
+</table>
+
+<p style="margin:18px 0 0 0; font-size:13px; color:#64748b;">
+  Direct link: <span style="color:#475569; word-break:break-all; font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;">{{ detail_url }}</span>
+</p>
+{% endblock %}

templates/emails/verifying.body.txt

@@ -0,0 +1,18 @@
+Hi,
+
+Good news -- your hamprint submission "{{ submission.slug }}" passed the
+automated checks (size, format, host allow-list) and is now waiting for an
+operator to take a manual look.
+
+    Codename : {{ submission.slug }}
+    Status   : Verifying
+
+If the operator is happy with the print job, it moves into the print queue
+shortly after and we'll email you again. You don't need to do anything
+right now.
+
+You can also check on it here:
+    {{ detail_url }}
+
+— hamprint
+{{ site_url }}

templates/emails/verifying.subject.txt

@@ -0,0 +1 @@
+hamprint: {{ submission.slug }} cleared auto-checks, awaiting operator review