Merge pull request 'feat: attach a self-describing ticket card to the email (v1.6.1-aio.10)' (#43) from feat/ticket-card-attachment into main

Reviewed-on: #43

README.md

@@ -62,10 +62,13 @@ Events includes a shareable ticket scanner, which can be used to register attend
 - **Stripe session.** The buyer's email is passed as `customer_email`
   (prefilled and locked on the hosted page); the line item is named after the
   event; `event_id`, `quantity` and `ticket_ids` ride along as metadata.
-- **Email.** Multipart text + HTML with the ticket QR embedded from
+- **Email.** Multipart text + HTML (links, no images) with the **ticket card**
-  `GET /events/api/v1/qr/{ticket_id}` (PNG, branded with the instance QR logo).
+  attached — a self-describing PNG (site, event, when, where, QR with the
-  `POST /events/api/v1/tickets/{ticket_id}/resend-email` returns a
+  instance logo, name on ticket, ticket id) also served at
-  `TicketResendResult` with per-channel outcome.
+  `GET /events/api/v1/ticket-card/{ticket_id}`; the bare QR stays at
+  `GET /events/api/v1/qr/{ticket_id}`. Headers carry Date, Message-ID and a
+  From display name (site title). `POST /events/api/v1/tickets/{ticket_id}/resend-email`
+  returns a `TicketResendResult` with per-channel outcome.
 
 ## Powered by LNbits
 

config.json

@@ -1,6 +1,6 @@
 {
   "id": "events",
-  "version": "1.6.1-aio.9",
+  "version": "1.6.1-aio.10",
   "name": "Events",
   "repo": "https://git.atitlan.io/aiolabs/events",
   "short_description": "Sell and register event tickets",

docs/upstream-candidates.md

@@ -4,15 +4,16 @@ Running log of fork features that are shaped so they could be offered to
 `lnbits/events` (or `lnbits/lnbits`). Add a row whenever a change lands here
 in an upstream-compatible form; strike it when the PR merges upstream.
 
-| Feature                                                                                                         | Where                                                        | Upstream target                                                                                             | Readiness                                                                        |
+| Feature                                                                                                                                          | Where                                                        | Upstream target                                                                                             | Readiness                                                                        |
-| --------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- |
+| ------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- |
-| `frontend_url` + origin allow-list + `?checkout=` return contract                                               | `views_api.py` `_resolve_frontend_root`, `api_ticket_create` | lnbits/events                                                                                               | after the #33 rebase, as a small PR                                              |
+| `frontend_url` + origin allow-list + `?checkout=` return contract                                                                                | `views_api.py` `_resolve_frontend_root`, `api_ticket_create` | lnbits/events                                                                                               | after the #33 rebase, as a small PR                                              |
-| Ticket ids minted before the invoice so `success_url` can carry them                                            | `api_ticket_create`                                          | lnbits/events                                                                                               | ships with the above                                                             |
+| Ticket ids minted before the invoice so `success_url` can carry them                                                                             | `api_ticket_create`                                          | lnbits/events                                                                                               | ships with the above                                                             |
-| `extra.checkout` (success/cancel URL, `customer_email`, line item, metadata) on fiat purchases                  | `api_ticket_create`                                          | lnbits/events (needs lnbits `StripeCheckoutOptions.cancel_url`/`customer_email`, PR'd from aiolabs/lnbits)  | with the lnbits patch                                                            |
+| `extra.checkout` (success/cancel URL, `customer_email`, line item, metadata) on fiat purchases                                                   | `api_ticket_create`                                          | lnbits/events (needs lnbits `StripeCheckoutOptions.cancel_url`/`customer_email`, PR'd from aiolabs/lnbits)  | with the lnbits patch                                                            |
-| `extra.payment_methods` per event + `tickets_payment_methods` NIP-52 tag                                        | `models.py`, `nostr_publisher.py`                            | lnbits/events (v2 PR #64 introduces the same field)                                                         | offer as review input on #64                                                     |
+| `extra.payment_methods` per event + `tickets_payment_methods` NIP-52 tag                                                                         | `models.py`, `nostr_publisher.py`                            | lnbits/events (v2 PR #64 introduces the same field)                                                         | offer as review input on #64                                                     |
-| `asyncio.to_thread` around the smtplib send                                                                     | `services.py` `_send_ticket_email_notification`              | lnbits/events                                                                                               | trivial, standalone                                                              |
+| `asyncio.to_thread` around the smtplib send                                                                                                      | `services.py` `_send_ticket_email_notification`              | lnbits/events                                                                                               | trivial, standalone                                                              |
-| QR logo overlay in `make_qr_png` (instance `lnbits_qr_logo`)                                                    | `views_api.py`                                               | lnbits/events                                                                                               | standalone                                                                       |
+| QR logo overlay in `make_qr_png` (instance `lnbits_qr_logo`)                                                                                     | `views_api.py`                                               | lnbits/events                                                                                               | standalone                                                                       |
-| Multi-ticket purchase as N rows on one `payment_hash`                                                           | `api_ticket_create`, `crud.py`                               | lnbits/events                                                                                               | overlaps v2 baskets; review input on #64                                         |
+| Multi-ticket purchase as N rows on one `payment_hash`                                                                                            | `api_ticket_create`, `crud.py`                               | lnbits/events                                                                                               | overlaps v2 baskets; review input on #64                                         |
-| Free tickets without minting an invoice                                                                         | `_issue_free_tickets`                                        | lnbits/events                                                                                               | small, standalone                                                                |
+| Free tickets without minting an invoice                                                                                                          | `_issue_free_tickets`                                        | lnbits/events                                                                                               | small, standalone                                                                |
-| NIP-52 publishing + approval workflow                                                                           | `nostr_*.py`, `views_api.py`                                 | lnbits/events #46                                                                                           | open; rebase onto v1.6.8                                                         |
+| NIP-52 publishing + approval workflow                                                                                                            | `nostr_*.py`, `views_api.py`                                 | lnbits/events #46                                                                                           | open; rebase onto v1.6.8                                                         |
-| `Date` + `Message-ID` + From display name on the ticket email (`build_ticket_email`); event details in the body | `services.py`                                                | lnbits/events (mailer) **and** lnbits/lnbits `send_email` (same omissions, hits password-reset/admin mails) | trivial, standalone — measured: SpamAssassin MISSING_DATE 1.4 + MISSING_MID 0.14 |
+| `Date` + `Message-ID` + From display name on the ticket email (`build_ticket_email`); event details in the body                                  | `services.py`                                                | lnbits/events (mailer) **and** lnbits/lnbits `send_email` (same omissions, hits password-reset/admin mails) | trivial, standalone — measured: SpamAssassin MISSING_DATE 1.4 + MISSING_MID 0.14 |
+| Ticket card PNG (event/when/where/QR/name/id) attached to the ticket email instead of a remote `<img>` (`qr.py`, `GET /api/v1/ticket-card/{id}`) | `qr.py`, `services.py`                                       | lnbits/events (their "ticket image" compositing could reuse the renderer)                                   | standalone; mail-tester: removes HTML_IMAGE_ONLY (1.8)                           |

qr.py

@@ -0,0 +1,254 @@
+"""QR + ticket-card rendering shared by the API and the mailer.
+
+`make_qr_png` is upstream v1.6.8's helper (pyqrcode + Pillow) with the
+instance QR logo pasted in the centre; `render_ticket_card` wraps it in a
+self-describing card (event, when, where, name, ticket id) so the PNG a
+buyer saves from the email still says what it is for.
+"""
+
+from __future__ import annotations
+
+import re
+from datetime import datetime
+from io import BytesIO
+from pathlib import Path
+
+import httpx
+import pyqrcode  # type: ignore[import-untyped]
+from lnbits.settings import settings
+from loguru import logger
+from PIL import Image, ImageDraw, ImageFont
+
+from .models import Event, Ticket
+
+_qr_logo_cache: dict[str, Image.Image | None] = {}
+
+
+async def load_qr_logo() -> Image.Image | None:
+    """LNbits' "QR Code/Favicon Logo" setting, as a Pillow image (cached).
+
+    Local `/static/...` values resolve inside the LNbits package; absolute
+    URLs are fetched once. Any failure just yields a plain QR.
+    """
+    source = (settings.lnbits_qr_logo or "").strip()
+    if not source:
+        return None
+    if source in _qr_logo_cache:
+        return _qr_logo_cache[source]
+    logo: Image.Image | None = None
+    try:
+        if source.startswith(("http://", "https://")):
+            async with httpx.AsyncClient(timeout=5) as client:
+                resp = await client.get(source)
+                resp.raise_for_status()
+                logo = Image.open(BytesIO(resp.content)).convert("RGBA")
+        else:
+            local = Path(settings.lnbits_path) / source.lstrip("/")
+            if local.is_file():
+                logo = Image.open(local).convert("RGBA")
+    except Exception as exc:
+        logger.warning(f"QR logo '{source}' unavailable: {exc}")
+        logo = None
+    _qr_logo_cache[source] = logo
+    return logo
+
+
+def make_qr_png(
+    data: str,
+    size: int = 235,
+    border: int = 4,
+    logo: Image.Image | None = None,
+) -> Image.Image:
+    """Render `data` as a QR image. With `logo`, the code is built at
+    error-correction level H and the logo is pasted in the centre on a white
+    pad at ≤ 20 % of the width — the same look LNbits' client-side
+    `lnbits-qrcode` component produces."""
+    qr = pyqrcode.create(data, error="H" if logo is not None else "M")
+    matrix = qr.code
+    modules = len(matrix)
+
+    total_modules = modules + border * 2
+    box_size = max(1, size // total_modules)
+    img_size = total_modules * box_size
+
+    img = Image.new("RGBA", (img_size, img_size), "white")
+    draw = ImageDraw.Draw(img)
+
+    for y, row in enumerate(matrix):
+        for x, cell in enumerate(row):
+            if cell:
+                x0 = (x + border) * box_size
+                y0 = (y + border) * box_size
+                draw.rectangle(
+                    [x0, y0, x0 + box_size - 1, y0 + box_size - 1],
+                    fill="black",
+                )
+
+    if img_size != size:
+        img = img.resize((size, size), Image.Resampling.NEAREST)
+
+    if logo is not None:
+        logo_size = max(8, int(size * 0.2))
+        pad = max(2, logo_size // 8)
+        scaled = logo.copy()
+        scaled.thumbnail((logo_size, logo_size), Image.Resampling.LANCZOS)
+        plate = Image.new(
+            "RGBA", (scaled.width + 2 * pad, scaled.height + 2 * pad), "white"
+        )
+        plate.paste(scaled, (pad, pad), scaled)
+        img.paste(
+            plate,
+            ((size - plate.width) // 2, (size - plate.height) // 2),
+            plate,
+        )
+
+    return img
+
+
+def _parse_iso(value: str | None) -> datetime | None:
+    if not value:
+        return None
+    try:
+        return datetime.fromisoformat(value)
+    except ValueError:
+        try:
+            return datetime.strptime(value[:10], "%Y-%m-%d")
+        except ValueError:
+            return None
+
+
+def format_event_when(event: Event) -> str:
+    """'Fri 19 Feb 2027, 16:00 - 20:00' (same day) or a full range; the raw
+    strings when they do not parse."""
+    start = _parse_iso(event.event_start_date)
+    end = _parse_iso(event.event_end_date)
+    if not start:
+        return event.event_start_date or ""
+    has_time = "T" in (event.event_start_date or "")
+    day = start.strftime("%a %d %b %Y")
+    if not end or end == start:
+        return f"{day}, {start.strftime('%H:%M')}" if has_time else day
+    if end.date() == start.date():
+        if has_time:
+            return f"{day}, {start.strftime('%H:%M')} - {end.strftime('%H:%M')}"
+        return day
+    end_day = end.strftime("%a %d %b %Y")
+    if has_time:
+        return f"{day} {start.strftime('%H:%M')} - {end_day} {end.strftime('%H:%M')}"
+    return f"{day} - {end_day}"
+
+
+def ticket_card_filename(ticket: Ticket, event: Event) -> str:
+    slug = re.sub(r"[^a-z0-9]+", "-", event.name.lower()).strip("-")[:40] or "event"
+    return f"ticket-{slug}-{ticket.id[:8]}.png"
+
+
+_FONT_DIR = Path(__file__).resolve().parent / "static" / "fonts"
+
+
+def _font(
+    size: int, bold: bool = False
+) -> ImageFont.ImageFont | ImageFont.FreeTypeFont:
+    """DejaVu Sans shipped with the extension (full Latin coverage — the
+    Pillow-bundled default lacks accented glyphs, so 'Château' would render
+    as tofu); Pillow's default is the fallback."""
+    path = _FONT_DIR / ("DejaVuSans-Bold.ttf" if bold else "DejaVuSans.ttf")
+    try:
+        return ImageFont.truetype(str(path), size)
+    except OSError:
+        try:
+            return ImageFont.load_default(size=size)
+        except Exception:  # very old Pillow: bitmap default only
+            return ImageFont.load_default()
+
+
+def _wrap(draw: ImageDraw.ImageDraw, text: str, font, max_width: int) -> list[str]:
+    lines: list[str] = []
+    for paragraph in text.split("\n"):
+        words = paragraph.split()
+        line = ""
+        for word in words:
+            candidate = f"{line} {word}".strip()
+            if draw.textlength(candidate, font=font) <= max_width or not line:
+                line = candidate
+            else:
+                lines.append(line)
+                line = word
+        lines.append(line)
+    return lines
+
+
+def render_ticket_card(
+    ticket: Ticket,
+    event: Event,
+    *,
+    logo: Image.Image | None = None,
+    site_title: str | None = None,
+    width: int = 800,
+) -> Image.Image:
+    """A self-describing ticket: header (site), event name, when/where, the
+    QR, then name on ticket + ticket id + door instruction."""
+    pad = 48
+    inner = width - 2 * pad
+    title_font = _font(40, bold=True)
+    body_font = _font(28)
+    small_font = _font(22)
+    mono_font = _font(24)
+
+    # Measure first: the card grows with the wrapped title.
+    probe = ImageDraw.Draw(Image.new("RGB", (width, 10), "white"))
+    title_lines = _wrap(probe, event.name, title_font, inner)
+    when = format_event_when(event)
+    meta_lines = [when] if when else []
+    if event.location:
+        meta_lines += _wrap(probe, event.location, body_font, inner)
+    qr_size = min(inner, 560)
+    detail_lines = []
+    if ticket.name:
+        detail_lines.append(f"Name: {ticket.name}")
+    detail_lines.append(f"Ticket {ticket.id}")
+
+    y = pad
+    y += 30 + 16  # site title line
+    y += len(title_lines) * 52 + 12
+    y += len(meta_lines) * 36 + 28
+    qr_y = y
+    y += qr_size + 28
+    y += len(detail_lines) * 36 + 12
+    y += 30 + pad  # footer
+    height = y
+
+    img = Image.new("RGB", (width, height), "white")
+    draw = ImageDraw.Draw(img)
+    grey = (110, 110, 110)
+    black = (20, 20, 20)
+
+    y = pad
+    draw.text((pad, y), (site_title or "Ticket").upper(), fill=grey, font=small_font)
+    y += 30 + 16
+    for line in title_lines:
+        draw.text((pad, y), line, fill=black, font=title_font)
+        y += 52
+    y += 12
+    for line in meta_lines:
+        draw.text((pad, y), line, fill=black, font=body_font)
+        y += 36
+    y += 28
+
+    qr = make_qr_png(f"ticket://{ticket.id}", size=qr_size, logo=logo).convert("RGB")
+    img.paste(qr, ((width - qr_size) // 2, qr_y))
+    y = qr_y + qr_size + 28
+
+    for line in detail_lines:
+        font = mono_font if line.startswith("Ticket ") else body_font
+        draw.text((pad, y), line, fill=black, font=font)
+        y += 36
+    y += 12
+    draw.text((pad, y), "Show this QR code at the door.", fill=grey, font=small_font)
+    return img
+
+
+def image_png_bytes(img: Image.Image) -> bytes:
+    out = BytesIO()
+    img.save(out, format="PNG")
+    return out.getvalue()

services.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 import asyncio
+import re
 import smtplib
 from asyncio.tasks import create_task
+from email.mime.image import MIMEImage
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from email.utils import formataddr, formatdate, make_msgid
@@ -26,6 +28,13 @@ from .crud import (
 )
 from .models import Event, NotificationDeliveryResult, Ticket, TicketResendResult
 from .nostr_hooks import publish_or_delete_nostr_event
+from .qr import (
+    format_event_when,
+    image_png_bytes,
+    load_qr_logo,
+    render_ticket_card,
+    ticket_card_filename,
+)
 
 DEFAULT_NOSTR_RELAYS = [
     "wss://relay.damus.io",
@@ -118,17 +127,15 @@ def _ticket_notification_message(ticket: Ticket, event: Event) -> tuple[str, str
 def _ticket_details(ticket: Ticket, event: Event) -> str:
     """Human-readable ticket facts for the email body. Also what keeps the
     mail from being an image with no words (SpamAssassin HTML_IMAGE_ONLY)."""
-    when = event.event_start_date
+    lines = [f"Event: {event.name}", f"When: {format_event_when(event)}"]
-    if event.event_end_date and event.event_end_date != event.event_start_date:
-        when = f"{when} to {event.event_end_date}"
-    lines = [f"Event: {event.name}", f"When: {when}"]
     if event.location:
         lines.append(f"Where: {event.location}")
     if ticket.name:
         lines.append(f"Name on ticket: {ticket.name}")
     lines.append(f"Ticket ID: {ticket.id}")
     lines.append(
-        "Show the QR code below (or open the link above on your phone) at the "
+        "Your ticket (with its QR code) is attached to this email — save it "
+        "or open the link above on your phone, and show the QR code at the "
         "door to be scanned in."
     )
     return "\n".join(lines)
@@ -142,14 +149,18 @@ def _ticket_delivery_message(ticket: Ticket, event: Event, base_message: str) ->
 
 
 def _ticket_email_html_message(ticket: Ticket, event: Event, base_message: str) -> str:
+    """HTML twin of the text part. Deliberately no <img>: the card travels
+    as an attachment (renders inline in most clients, works offline, and
+    keeps SpamAssassin's HTML_IMAGE_ONLY rules quiet), and URLs become
+    links."""
     text_message = _ticket_delivery_message(ticket, event, base_message)
-    html_message = f"<p>{escape(text_message).replace(chr(10), '<br />')}</p>"
+    html = escape(text_message)
-    image_url = escape(_ticket_image_url(ticket), quote=True)
+    html = re.sub(
-    return (
+        r"(https?://[^\s<]+)",
-        f"{html_message}"
+        lambda m: f'<a href="{m.group(1)}">{m.group(1)}</a>',
-        f'<p><img src="{image_url}" alt="Ticket QR code" '
+        html,
-        'style="max-width: 300px; height: auto;" /></p>'
     )
+    return f"<p>{html.replace(chr(10), '<br />')}</p>"
 
 
 def _ticket_notification_payload(ticket: Ticket, event: Event) -> tuple[str, str, str]:
@@ -195,8 +206,20 @@ async def _deliver_ticket_notifications(
     if result.email.attempted:
         try:
             assert ticket.email
+            card = render_ticket_card(
+                ticket,
+                event,
+                logo=await load_qr_logo(),
+                site_title=settings.lnbits_site_title,
+            )
             await _send_ticket_email_notification(
-                [ticket.email], text_message, subject, html_message
+                [ticket.email],
+                text_message,
+                subject,
+                html_message,
+                attachments=[
+                    (ticket_card_filename(ticket, event), image_png_bytes(card))
+                ],
             )
             ticket.extra.email_notification_sent = True
             result.email.sent = True
@@ -227,6 +250,7 @@ async def _send_ticket_email_notification(
     message: str,
     subject: str,
     html_message: str | None = None,
+    attachments: list[tuple[str, bytes]] | None = None,
 ) -> None:
     """Multipart (text + HTML) ticket email through the instance SMTP
     settings. Core's `send_email_notification` is plain-text only, which is
@@ -244,7 +268,9 @@ async def _send_ticket_email_notification(
         if not is_valid_email_address(address):
             raise ValueError(f"Invalid email address: {address}")
 
-    msg = build_ticket_email(from_email, to_emails, subject, message, html_message)
+    msg = build_ticket_email(
+        from_email, to_emails, subject, message, html_message, attachments
+    )
     username = settings.lnbits_email_notifications_username or from_email
     await asyncio.to_thread(
         _smtp_send,
@@ -264,22 +290,34 @@ def build_ticket_email(
     subject: str,
     message: str,
     html_message: str | None = None,
+    attachments: list[tuple[str, bytes]] | None = None,
 ) -> MIMEMultipart:
-    """Assemble the multipart ticket email with the headers receivers score
+    """Assemble the ticket email: text + HTML alternatives, PNG attachments
-    on: a Date and a Message-ID (their absence is what SpamAssassin's
+    (the ticket card), and the headers receivers score on — a Date and a
-    MISSING_DATE / MISSING_MID flag, and what Gmail/Outlook read as
+    Message-ID (their absence is what SpamAssassin's MISSING_DATE /
-    machine-generated), and a display name on From so the sender is not a
+    MISSING_MID flag, and what Gmail/Outlook read as machine-generated) and
-    bare address."""
+    a display name on From so the sender is not a bare address."""
-    msg = MIMEMultipart("alternative")
+    body = MIMEMultipart("alternative")
+    body.attach(MIMEText(message, "plain"))
+    if html_message:
+        body.attach(MIMEText(html_message, "html"))
+
+    if attachments:
+        msg = MIMEMultipart("mixed")
+        msg.attach(body)
+        for filename, data in attachments:
+            part = MIMEImage(data, _subtype="png")
+            part.add_header("Content-Disposition", "attachment", filename=filename)
+            msg.attach(part)
+    else:
+        msg = body
+
     sender_name = (settings.lnbits_site_title or "").strip() or "Tickets"
     msg["From"] = formataddr((sender_name, from_email))
     msg["To"] = ", ".join(to_emails)
     msg["Subject"] = subject
     msg["Date"] = formatdate(localtime=True)
     msg["Message-ID"] = make_msgid(domain=from_email.rsplit("@", 1)[-1])
-    msg.attach(MIMEText(message, "plain"))
-    if html_message:
-        msg.attach(MIMEText(html_message, "html"))
     return msg
 
 
@@ -318,11 +356,13 @@ def _ticket_url(ticket: Ticket) -> str:
 
 
 def _ticket_image_url(ticket: Ticket) -> str:
-    """The QR PNG is served by THIS extension on the LNbits host, so it is
+    """The ticket card PNG is served by THIS extension on the LNbits host, so
-    built from `lnbits_baseurl` even when `ticket_base_url` points at a
+    it is built from `lnbits_baseurl` even when `ticket_base_url` points at
-    separate web app (deviation from upstream, which assumes both are the
+    a separate web app (deviation from upstream, which assumes both are the
     same host)."""
-    return f"{settings.lnbits_baseurl.rstrip('/')}/events/api/v1/qr/{ticket.id}"
+    return (
+        f"{settings.lnbits_baseurl.rstrip('/')}/events/api/v1/ticket-card/{ticket.id}"
+    )
 
 
 async def refund_tickets(event_id: str):

static/fonts/LICENSE-DejaVu.txt

@@ -0,0 +1,187 @@
+Fonts are (c) Bitstream (see below). DejaVu changes are in public domain.
+Glyphs imported from Arev fonts are (c) Tavmjong Bah (see below)
+
+
+Bitstream Vera Fonts Copyright
+------------------------------
+
+Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Bitstream Vera is
+a trademark of Bitstream, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of the fonts accompanying this license ("Fonts") and associated
+documentation files (the "Font Software"), to reproduce and distribute the
+Font Software, including without limitation the rights to use, copy, merge,
+publish, distribute, and/or sell copies of the Font Software, and to permit
+persons to whom the Font Software is furnished to do so, subject to the
+following conditions:
+
+The above copyright and trademark notices and this permission notice shall
+be included in all copies of one or more of the Font Software typefaces.
+
+The Font Software may be modified, altered, or added to, and in particular
+the designs of glyphs or characters in the Fonts may be modified and
+additional glyphs or characters may be added to the Fonts, only if the fonts
+are renamed to names not containing either the words "Bitstream" or the word
+"Vera".
+
+This License becomes null and void to the extent applicable to Fonts or Font
+Software that has been modified and is distributed under the "Bitstream
+Vera" names.
+
+The Font Software may be sold as part of a larger software package but no
+copy of one or more of the Font Software typefaces may be sold by itself.
+
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,
+TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL BITSTREAM OR THE GNOME
+FOUNDATION BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING
+ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE
+FONT SOFTWARE.
+
+Except as contained in this notice, the names of Gnome, the Gnome
+Foundation, and Bitstream Inc., shall not be used in advertising or
+otherwise to promote the sale, use or other dealings in this Font Software
+without prior written authorization from the Gnome Foundation or Bitstream
+Inc., respectively. For further information, contact: fonts at gnome dot
+org.
+
+Arev Fonts Copyright
+------------------------------
+
+Copyright (c) 2006 by Tavmjong Bah. All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the fonts accompanying this license ("Fonts") and
+associated documentation files (the "Font Software"), to reproduce
+and distribute the modifications to the Bitstream Vera Font Software,
+including without limitation the rights to use, copy, merge, publish,
+distribute, and/or sell copies of the Font Software, and to permit
+persons to whom the Font Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright and trademark notices and this permission notice
+shall be included in all copies of one or more of the Font Software
+typefaces.
+
+The Font Software may be modified, altered, or added to, and in
+particular the designs of glyphs or characters in the Fonts may be
+modified and additional glyphs or characters may be added to the
+Fonts, only if the fonts are renamed to names not containing either
+the words "Tavmjong Bah" or the word "Arev".
+
+This License becomes null and void to the extent applicable to Fonts
+or Font Software that has been modified and is distributed under the 
+"Tavmjong Bah Arev" names.
+
+The Font Software may be sold as part of a larger software package but
+no copy of one or more of the Font Software typefaces may be sold by
+itself.
+
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL
+TAVMJONG BAH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
+
+Except as contained in this notice, the name of Tavmjong Bah shall not
+be used in advertising or otherwise to promote the sale, use or other
+dealings in this Font Software without prior written authorization
+from Tavmjong Bah. For further information, contact: tavmjong @ free
+. fr.
+
+TeX Gyre DJV Math
+-----------------
+Fonts are (c) Bitstream (see below). DejaVu changes are in public domain.
+
+Math extensions done by B. Jackowski, P. Strzelczyk and P. Pianowski
+(on behalf of TeX users groups) are in public domain.
+
+Letters imported from Euler Fraktur from AMSfonts are (c) American
+Mathematical Society (see below).
+Bitstream Vera Fonts Copyright
+Copyright (c) 2003 by Bitstream, Inc. All Rights Reserved. Bitstream Vera
+is a trademark of Bitstream, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of the fonts accompanying this license (“Fonts”) and associated
+documentation
+files (the “Font Software”), to reproduce and distribute the Font Software,
+including without limitation the rights to use, copy, merge, publish,
+distribute,
+and/or sell copies of the Font Software, and to permit persons  to whom
+the Font Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright and trademark notices and this permission notice
+shall be
+included in all copies of one or more of the Font Software typefaces.
+
+The Font Software may be modified, altered, or added to, and in particular
+the designs of glyphs or characters in the Fonts may be modified and
+additional
+glyphs or characters may be added to the Fonts, only if the fonts are
+renamed
+to names not containing either the words “Bitstream” or the word “Vera”.
+
+This License becomes null and void to the extent applicable to Fonts or
+Font Software
+that has been modified and is distributed under the “Bitstream Vera”
+names.
+
+The Font Software may be sold as part of a larger software package but
+no copy
+of one or more of the Font Software typefaces may be sold by itself.
+
+THE FONT SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT,
+TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL BITSTREAM OR THE GNOME
+FOUNDATION
+BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, INCLUDING ANY GENERAL,
+SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN
+ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR
+INABILITY TO USE
+THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.
+Except as contained in this notice, the names of GNOME, the GNOME
+Foundation,
+and Bitstream Inc., shall not be used in advertising or otherwise to promote
+the sale, use or other dealings in this Font Software without prior written
+authorization from the GNOME Foundation or Bitstream Inc., respectively.
+For further information, contact: fonts at gnome dot org.
+
+AMSFonts (v. 2.2) copyright
+
+The PostScript Type 1 implementation of the AMSFonts produced by and
+previously distributed by Blue Sky Research and Y&Y, Inc. are now freely
+available for general use. This has been accomplished through the
+cooperation
+of a consortium of scientific publishers with Blue Sky Research and Y&Y.
+Members of this consortium include:
+
+Elsevier Science IBM Corporation Society for Industrial and Applied
+Mathematics (SIAM) Springer-Verlag American Mathematical Society (AMS)
+
+In order to assure the authenticity of these fonts, copyright will be
+held by
+the American Mathematical Society. This is not meant to restrict in any way
+the legitimate use of the fonts, such as (but not limited to) electronic
+distribution of documents containing these fonts, inclusion of these fonts
+into other public domain or commercial font collections or computer
+applications, use of the outline data to create derivative fonts and/or
+faces, etc. However, the AMS does require that the AMS copyright notice be
+removed from any derivative versions of the fonts which have been altered in
+any way. In addition, to ensure the fidelity of TeX documents using Computer
+Modern fonts, Professor Donald Knuth, creator of the Computer Modern faces,
+has requested that any alterations which yield different font metrics be
+given a different name.
+
+$Id$

tests/test_ticket_email.py

@@ -53,6 +53,25 @@ def test_email_carries_date_message_id_and_display_name(monkeypatch):
     assert parts == ["text/plain", "text/html"]
 
 
+def test_email_attaches_the_ticket_card(monkeypatch):
+    monkeypatch.setattr(settings, "lnbits_site_title", "Oyez!")
+    png = b"\x89PNG\r\n\x1a\n" + b"0" * 32
+    msg = build_ticket_email(
+        "tickets@example.org",
+        ["ada@example.com"],
+        "Subj",
+        "text",
+        "<p>html</p>",
+        attachments=[("ticket-test-8auNuuaB.png", png)],
+    )
+    assert msg.get_content_type() == "multipart/mixed"
+    body, attachment = msg.get_payload()
+    assert body.get_content_type() == "multipart/alternative"
+    assert attachment.get_content_type() == "image/png"
+    assert attachment.get_filename() == "ticket-test-8auNuuaB.png"
+    assert attachment.get_payload(decode=True) == png
+
+
 def test_payload_includes_event_details_and_qr(monkeypatch):
     monkeypatch.setattr(settings, "lnbits_baseurl", "https://lnbits.example/")
     subject, text, html = _ticket_notification_payload(_ticket(), _event())
@@ -65,5 +84,6 @@ def test_payload_includes_event_details_and_qr(monkeypatch):
         "at the door",
     ):
         assert needle in text
-    assert "/events/api/v1/qr/tkt1" in text
+    assert "/events/api/v1/ticket-card/tkt1" in text
-    assert "<img" in html and "Ticket ID: tkt1" in html
+    assert "<img" not in html and "Ticket ID: tkt1" in html
+    assert '<a href="https://lnbits.example/events/api/v1/ticket-card/tkt1">' in html

tests/test_ticket_qr.py

@@ -2,7 +2,7 @@ from io import BytesIO
 
 from PIL import Image
 
-from ..views_api import make_qr_png
+from ..qr import make_qr_png
 
 
 def test_make_qr_png_renders_requested_size():
@@ -20,3 +20,45 @@ def test_make_qr_png_pastes_a_centred_logo():
     out = BytesIO()
     img.save(out, format="PNG")
     assert out.getvalue().startswith(b"\x89PNG")
+
+
+def test_render_ticket_card_is_self_describing():
+    from datetime import datetime, timezone
+
+    from ..models import Event, Ticket
+    from ..qr import format_event_when, render_ticket_card, ticket_card_filename
+
+    now = datetime.now(timezone.utc)
+    event = Event(
+        id="evt1",
+        wallet="w",
+        name="Château du Faune | Uru Ecstatic Dance",
+        info="",
+        closing_date="2027-02-19",
+        event_start_date="2027-02-19T16:00:00+01:00",
+        event_end_date="2027-02-19T20:00:00+01:00",
+        location="The Chateau",
+        amount_tickets=10,
+        price_per_ticket=15,
+        time=now,
+    )
+    ticket = Ticket(
+        id="8auNuuaBv7TFGj7BYoVnTN",
+        wallet="w",
+        event="evt1",
+        name="Guest Test",
+        email="g@example.com",
+        registered=False,
+        paid=True,
+        time=now,
+        reg_timestamp=now,
+    )
+    assert format_event_when(event) == "Fri 19 Feb 2027, 16:00 - 20:00"
+    assert (
+        ticket_card_filename(ticket, event)
+        == "ticket-ch-teau-du-faune-uru-ecstatic-dance-8auNuuaB.png"
+    )
+    card = render_ticket_card(ticket, event, site_title="Oyez!")
+    assert card.width == 800 and card.height > 800
+    # QR area is centred; its finder pattern is black
+    assert card.getpixel((400, card.height // 2)) in ((0, 0, 0), (255, 255, 255))

views_api.py

@@ -2,12 +2,9 @@ import asyncio
 from datetime import datetime, timezone
 from http import HTTPStatus
 from io import BytesIO
-from pathlib import Path
 from typing import Any
 from urllib.parse import urlsplit
 
-import httpx
-import pyqrcode  # type: ignore[import-untyped]
 from fastapi import (
     APIRouter,
     Depends,
@@ -37,8 +34,6 @@ from lnbits.utils.exchange_rates import (
     satoshis_amount_as_fiat,
 )
 from lnbits.utils.nostr import normalize_public_key
-from loguru import logger
-from PIL import Image, ImageDraw
 
 from .crud import (
     create_event,
@@ -76,6 +71,13 @@ from .models import (
     effective_payment_methods,
 )
 from .nostr_hooks import publish_or_delete_nostr_event
+from .qr import (
+    image_png_bytes,
+    load_qr_logo,
+    make_qr_png,
+    render_ticket_card,
+    ticket_card_filename,
+)
 from .services import (
     refund_tickets,
     resend_ticket_email_notification,
@@ -570,90 +572,6 @@ def _resolve_frontend_root(data: CreateTicket, request: Request) -> str:
     return data.frontend_url.rstrip("/")
 
 
-_qr_logo_cache: dict[str, Image.Image | None] = {}
-
-
-async def _load_qr_logo() -> Image.Image | None:
-    """LNbits' "QR Code/Favicon Logo" setting, as a Pillow image (cached).
-
-    Local `/static/...` values resolve inside the LNbits package; absolute
-    URLs are fetched once. Any failure just yields a plain QR.
-    """
-    source = (settings.lnbits_qr_logo or "").strip()
-    if not source:
-        return None
-    if source in _qr_logo_cache:
-        return _qr_logo_cache[source]
-    logo: Image.Image | None = None
-    try:
-        if source.startswith(("http://", "https://")):
-            async with httpx.AsyncClient(timeout=5) as client:
-                resp = await client.get(source)
-                resp.raise_for_status()
-                logo = Image.open(BytesIO(resp.content)).convert("RGBA")
-        else:
-            local = Path(settings.lnbits_path) / source.lstrip("/")
-            if local.is_file():
-                logo = Image.open(local).convert("RGBA")
-    except Exception as exc:
-        logger.warning(f"QR logo '{source}' unavailable: {exc}")
-        logo = None
-    _qr_logo_cache[source] = logo
-    return logo
-
-
-def make_qr_png(
-    data: str,
-    size: int = 235,
-    border: int = 4,
-    logo: Image.Image | None = None,
-) -> Image.Image:
-    """Render `data` as a QR image (upstream v1.6.8 shape). With `logo`, the
-    code is built at error-correction level H and the logo is pasted in the
-    centre on a white pad at ≤ 20 % of the width — the same look LNbits'
-    client-side `lnbits-qrcode` component produces."""
-    qr = pyqrcode.create(data, error="H" if logo is not None else "M")
-    matrix = qr.code
-    modules = len(matrix)
-
-    total_modules = modules + border * 2
-    box_size = max(1, size // total_modules)
-    img_size = total_modules * box_size
-
-    img = Image.new("RGBA", (img_size, img_size), "white")
-    draw = ImageDraw.Draw(img)
-
-    for y, row in enumerate(matrix):
-        for x, cell in enumerate(row):
-            if cell:
-                x0 = (x + border) * box_size
-                y0 = (y + border) * box_size
-                draw.rectangle(
-                    [x0, y0, x0 + box_size - 1, y0 + box_size - 1],
-                    fill="black",
-                )
-
-    if img_size != size:
-        img = img.resize((size, size), Image.Resampling.NEAREST)
-
-    if logo is not None:
-        logo_size = max(8, int(size * 0.2))
-        pad = max(2, logo_size // 8)
-        scaled = logo.copy()
-        scaled.thumbnail((logo_size, logo_size), Image.Resampling.LANCZOS)
-        plate = Image.new(
-            "RGBA", (scaled.width + 2 * pad, scaled.height + 2 * pad), "white"
-        )
-        plate.paste(scaled, (pad, pad), scaled)
-        img.paste(
-            plate,
-            ((size - plate.width) // 2, (size - plate.height) // 2),
-            plate,
-        )
-
-    return img
-
-
 async def _issue_free_tickets(
     *,
     event: Event,
@@ -1142,13 +1060,10 @@ async def api_ticket_qr(ticket_id: str):
             status_code=HTTPStatus.NOT_FOUND, detail="Ticket does not exist."
         )
 
-    logo = await _load_qr_logo()
+    logo = await load_qr_logo()
     image = make_qr_png(f"ticket://{ticket_id}", size=300, logo=logo)
-    output = BytesIO()
-    image.save(output, format="PNG")
-    output.seek(0)
     return StreamingResponse(
-        output,
+        BytesIO(image_png_bytes(image)),
         media_type="image/png",
         headers={
             "Cache-Control": "no-cache, no-store, must-revalidate",
@@ -1156,3 +1071,32 @@ async def api_ticket_qr(ticket_id: str):
             "Expires": "0",
         },
     )
+
+
+@qr_api_router.get("/ticket-card/{ticket_id}", response_class=StreamingResponse)
+async def api_ticket_card(ticket_id: str):
+    """Self-describing ticket PNG (event, when, where, QR, name, id) — the
+    same image the ticket email attaches. Anonymous like the QR endpoint."""
+    ticket = await get_ticket(ticket_id)
+    if not ticket:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND, detail="Ticket does not exist."
+        )
+    event = await get_event(ticket.event)
+    if not event:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND, detail="Event does not exist."
+        )
+    logo = await load_qr_logo()
+    card = render_ticket_card(
+        ticket, event, logo=logo, site_title=settings.lnbits_site_title
+    )
+    filename = ticket_card_filename(ticket, event)
+    return StreamingResponse(
+        BytesIO(image_png_bytes(card)),
+        media_type="image/png",
+        headers={
+            "Content-Disposition": f'inline; filename="{filename}"',
+            "Cache-Control": "no-cache, no-store, must-revalidate",
+        },
+    )