membershipworks: Add ability for instructors to generate and submit event invoices

cmsmanage/settings/base.py

@@ -42,6 +42,7 @@ INSTALLED_APPS = [
     "django_filters",
     "django_db_views",
     "django_mysql",
+    "django_sendfile",
     "django_bootstrap5",
     "tasks.apps.TasksConfig",
     "rentals.apps.RentalsConfig",
@@ -121,6 +122,7 @@ LOGGING = {
 
 MEDIA_ROOT = "media"
 MEDIA_URL = "media/"
+SENDFILE_ROOT = str(Path(__file__).parents[2] / "media" / "protected")
 
 WIKI_URL = "https://wiki.claremontmakerspace.org"
 

cmsmanage/settings/dev_base.py

@@ -21,3 +21,5 @@ MIDDLEWARE.insert(0, "debug_toolbar.middleware.DebugToolbarMiddleware")  # noqa:
 
 configure_hypothesis_profiles()
 settings.load_profile(os.getenv("HYPOTHESIS_PROFILE", "dev"))
+
+SENDFILE_BACKEND = "django_sendfile.backends.development"

cmsmanage/settings/prod_base.py

@@ -48,3 +48,6 @@ AUTH_LDAP_GROUP_SEARCH = LDAPSearch(
 )
 AUTH_LDAP_GROUP_TYPE = PosixGroupType()
 AUTH_LDAP_MIRROR_GROUPS = True
+
+SENDFILE_BACKEND = "django_sendfile.backends.nginx"
+SENDFILE_URL = "/media/protected"

membershipworks/dashboard.py

@@ -2,12 +2,15 @@ from django.urls import reverse
 
 import dashboard
 from dashboard import Link
+from membershipworks.models import EventExt, Member
 
 
 @dashboard.register
 class MembershipworksDashboardFragment(dashboard.LinksCardDashboardFragment):
     name = "MembershipWorks"
 
+    @property
+    def links(self):
         links = [
             Link(
                 "Upcoming Events",
@@ -31,3 +34,16 @@ class MembershipworksDashboardFragment(dashboard.LinksCardDashboardFragment):
                 permission="membershipworks.view_member",
             ),
         ]
+
+        member = Member.from_user(self.request.user)
+        if (
+            member is not None
+            and EventExt.objects.filter(instructor__member=member).exists()
+        ):
+            links.append(
+                Link(
+                    "My Events", reverse("membershipworks:user-events"), permission=None
+                )
+            )
+
+        return links

membershipworks/forms.py

@@ -0,0 +1,38 @@
+from django import forms
+from django.contrib.auth.models import AbstractBaseUser
+
+from membershipworks.models import EventExt
+
+
+class EventInvoiceForm(forms.Form):
+    reviewed_invoice = forms.BooleanField(
+        label="I have reviewed this invoice and confirm that the course information, materials fee, course fees, enrollment information, invoice amount and all other details are correct.",
+        help_text='Please contact us at <a href="mailto:info@claremontmakerspace.org">info@claremontmakerspace.org</a> if corrections are required.',
+        required=True,
+    )
+    verified_payment_and_contact = forms.BooleanField(
+        label="I have verified my contact and payment information.",
+        help_text='You can <a href="https://claremontmakerspace.org/membersonly/">change your payment information here</a>. It may take up to an hour for your changes to take effect.',
+        required=True,
+    )
+
+    def __init__(self, *args, event: EventExt, user: AbstractBaseUser, **kwargs):
+        self.event = event
+        self.user = user
+        super().__init__(*args, **kwargs)
+
+    def clean(self):
+        if self.event.total_due_to_instructor is None:
+            raise forms.ValidationError(
+                "Event missing required information to generate invoice"
+            )
+
+        if not self.event.user_is_instructor(self.user):
+            raise forms.ValidationError(
+                "You are not the listed as the instructor for this event"
+            )
+
+        if hasattr(self.event, "eventinvoice"):
+            raise forms.ValidationError("Invoice already exists for this event")
+
+        return super().clean()

membershipworks/invoice_email.py

@@ -0,0 +1,65 @@
+from django.conf import settings
+from django.core.mail import EmailMessage, EmailMultiAlternatives
+from django.template import loader
+
+import mdformat
+from markdownify import markdownify
+
+from membershipworks.models import EventInvoice
+
+
+def make_multipart_email(
+    subject: str, html_body: str, to: tuple[str]
+) -> EmailMultiAlternatives:
+    plain_body = mdformat.text(markdownify(html_body), extensions={"tables"})
+
+    email = EmailMultiAlternatives(
+        subject,
+        plain_body,
+        from_email="CMS Invoices <invoices@claremontmakerspace.org>",
+        to=to,
+        reply_to=["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"],
+    )
+
+    email.attach_alternative(html_body, "text/html")
+    return email
+
+
+def make_instructor_email(
+    invoice: EventInvoice, pdf: bytes, event_url: str
+) -> EmailMessage:
+    template = loader.get_template(
+        "membershipworks/email/event_invoice_instructor.dj.html"
+    )
+    html_body = template.render({"invoice": invoice, "event_url": event_url})
+
+    message = make_multipart_email(
+        f'Your CMS instructor invoice has been received for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
+        html_body,
+        (invoice.event.instructor.member.sanitized_mailbox(),),
+    )
+    message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
+    return message
+
+
+def make_admin_email(invoice: EventInvoice, pdf: bytes, event_url: str) -> EmailMessage:
+    template = loader.get_template("membershipworks/email/event_invoice_admin.dj.html")
+    html_body = template.render({"invoice": invoice, "event_url": event_url})
+
+    message = make_multipart_email(
+        f'CMS instructor invoice created for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
+        html_body,
+        # TODO: should this be in database instead?
+        settings.INVOICE_HANDLERS,
+    )
+    message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
+    return message
+
+
+def make_invoice_emails(
+    invoice: EventInvoice, pdf: bytes, event_url: str
+) -> list[EmailMessage]:
+    return [
+        make_instructor_email(invoice, pdf, event_url),
+        make_admin_email(invoice, pdf, event_url),
+    ]

membershipworks/models.py

@@ -4,6 +4,7 @@ from typing import Optional
 
 import django.core.mail.message
 from django.conf import settings
+from django.contrib.auth.models import AbstractBaseUser
 from django.db import models
 from django.db.models import (
     Case,
@@ -20,6 +21,7 @@ from django.db.models import (
     When,
 )
 from django.db.models.functions import Coalesce
+from django.urls import reverse
 from django.utils import timezone
 
 import nh3
@@ -550,6 +552,15 @@ class EventExt(Event):
     )
     details = models.JSONField(null=True, blank=True)
 
+    def get_absolute_url(self) -> str:
+        return reverse("membershipworks:event-detail", kwargs={"eid": self.eid})
+
+    def user_is_instructor(self, user: AbstractBaseUser) -> bool:
+        member = Member.from_user(user)
+        if member is not None:
+            return self.instructor.member == member
+        return False
+
     class Meta:
         verbose_name = "event"
         ordering = ["-start"]

membershipworks/static/membershipworks/css/event_invoice_pdf.css

@@ -0,0 +1,82 @@
+@page {
+  size: letter portrait;
+  margin: 1.2in 0.7in;
+
+  @top-center {
+    content: "Event Invoice";
+    font-size: 1.2em;
+    color: #444;
+    vertical-align: bottom;
+  }
+
+  @top-left {
+    vertical-align: bottom;
+    content: element(header);
+  }
+
+  @top-right {
+    content: "";
+    vertical-align: bottom;
+    background-position: bottom;
+    background-image: url("https://claremontmakerspace.org/wp-content/uploads/2018/06/cms_logo.png");
+    background-repeat: no-repeat;
+    background-size: 100%;
+    width: 7em;
+  }
+
+  @bottom-left {
+    content: element(footer-left);
+  }
+
+  @bottom-right {
+    content: element(footer-right);
+  }
+}
+
+footer {
+  font-size: 8pt;
+}
+
+footer .left {
+  position: running(footer-left);
+  margin-right: 1em;
+}
+
+footer .right {
+  position: running(footer-right);
+  text-align: right;
+}
+
+header {
+  position: running(header);
+}
+
+/* TODO: probably should just fix this server side */
+:root {
+  --bs-font-sans-serif: roboto;
+}
+
+body {
+  margin-top: 1em;
+}
+
+p {
+  margin-bottom: 0.2em;
+}
+
+/* Bootstrap fixes for Weasyprint */
+.table-group-divider {
+  border-top: 2px solid currentcolor;
+}
+
+.d-md-block {
+    display: block !important;
+}
+.col-md-7 {
+    flex: 0 0 auto;
+    width: 58.33333333%;
+}
+.col-md-4 {
+    flex: 0 0 auto;
+    width: 33.33333333%;
+}

membershipworks/templates/membershipworks/email/event_invoice_admin.dj.html

@@ -0,0 +1,6 @@
+<p>
+  New invoice received from
+  <b>{{ invoice.event.instructor }}</b> on <b>{{ invoice.date_submitted }}</b>.
+</p>
+
+{% include "membershipworks/email/event_invoice_details_fragment.dj.html" %}

membershipworks/templates/membershipworks/email/event_invoice_details_fragment.dj.html

@@ -0,0 +1,19 @@
+<p>
+  <div>
+    <b>Invoice #:</b> {{ invoice.uuid }}
+  </div>
+  <div>
+    <b>Event id:</b> {{ invoice.event.eid }}
+  </div>
+  <div>
+    <b>Event title:</b> {{ invoice.event }}
+  </div>
+  <div>
+    <b>Event duration:</b> {{ invoice.event.start }} - {{ invoice.event.end }}
+  </div>
+  <div>
+    <a href="{{ event_url }}">
+      <b>View this event and invoice in CMSManage</b>
+    </a>
+  </div>
+</p>

membershipworks/templates/membershipworks/email/event_invoice_instructor.dj.html

@@ -0,0 +1,5 @@
+<p>
+  Your invoice for <b>{{ invoice.event }}</b> has been received. A copy is attached for your records.
+</p>
+
+{% include "membershipworks/email/event_invoice_details_fragment.dj.html" %}

membershipworks/templates/membershipworks/event_detail.dj.html

@@ -0,0 +1,46 @@
+{% extends "base.dj.html" %}
+
+{% load nh3_tags %}
+{% load django_bootstrap5 %}
+
+{% block title %}Event Invoice for {{ event.details.ttl|nh3 }}{% endblock %}
+{% block admin_link %}
+  {% url 'admin:membershipworks_eventext_change' event.pk %}
+{% endblock %}
+{% block content %}
+  <div class="container">
+    {% include "membershipworks/event_invoice.dj.html" %}
+
+    <div class="card w-auto mt-5">
+      <div class="card-body">
+        {% if event.invoice %}
+          <div class="card-text text-center">
+            <p>
+              Invoice submitted on {{ event.invoice.date_submitted }}
+              for ${{ event.invoice.amount|floatformat:2 }},
+              {% if event.invoice.date_paid %}
+                paid on {{ event.invoice.date_paid }}
+              {% else %}
+                not paid yet
+              {% endif %}
+            </p>
+            <a class="btn btn-primary"
+               href="{% url 'membershipworks:event-invoice-pdf' event.invoice.pk %}">View PDF</a>
+          </div>
+        {% elif event.total_due_to_instructor is None %}
+          <p class="card-text text-center">
+            This event is missing required information to generate an invoice. Please contact us at <a href="mailto:info@claremontmakerspace.org">info@claremontmakerspace.org</a>.
+          </p>
+        {% elif user_is_instructor %}
+          <form method="post" class="card-text">
+            {% csrf_token %}
+            {% bootstrap_form form %}
+            <div class="text-center">{% bootstrap_button button_type="submit" content="Submit Invoice" %}</div>
+          </form>
+        {% else %}
+          <p>No invoice has been created for this event, and you are not listed as the the instructor.</p>
+        {% endif %}
+      </div>
+    </div>
+  </div>
+{% endblock %}

membershipworks/templates/membershipworks/event_invoice.dj.html

@@ -1,16 +1,14 @@
-{% extends "base.dj.html" %}
-
 {% load nh3_tags %}
 {% load render_table from django_tables2 %}
 
-{% block title %}Event Invoice for {{ event.details.ttl|nh3 }}{% endblock %}
-{% block admin_link %}
-  {% url 'admin:membershipworks_eventext_change' event.pk %}
-{% endblock %}
-{% block content %}
+<div class="row">
+  <div class="col-12 col-md-7">
     <p>
       <b>Event Name:</b> {{ event.details.ttl|nh3 }}
     </p>
+    <p>
+      <b>Event ID:</b> {{ event.eid }}
+    </p>
     <p>
       <b>Instructor:</b> {{ event.instructor }}
     </p>
@@ -19,11 +17,11 @@
         {% if meeting_times|length == 0 %}
           <b>Dates of Event:</b> Not set
         {% elif meeting_times|length == 1 %}
-        <b>Date of Event:</b> {{ meeting_times.0.start }} - {{ meeting_times.0.end }}
+          <b>Date of Event:</b> {{ meeting_times.0.start }} – {{ meeting_times.0.end }}
         {% else %}
           <b>Dates of Event:</b>
           <ul>
-          {% for meeting_time in meeting_times %}<li>{{ meeting_time.start }} - {{ meeting_time.end }}</li>{% endfor %}
+            {% for meeting_time in meeting_times %}<li>{{ meeting_time.start }} – {{ meeting_time.end }}</li>{% endfor %}
           </ul>
         {% endif %}
       {% endwith %}
@@ -32,7 +30,7 @@
       <b>Attendees:</b> {{ event.details.cnt }}/{{ event.details.cap }}
     </p>
     <p>
-    <b>Materials Fee [m]:</b>
+      <b>Materials Fee <span class="font-monospace fw-light">[m]</span>:</b>
       {% if event.materials_fee_included_in_price is None %}
         Unknown if included in price
       {% elif event.materials_fee_included_in_price %}
@@ -46,7 +44,22 @@
       {% endif %}
     </p>
     <p>
-    <b>Instructor Percentage [I]:</b> {{ event.instructor_percentage }}
+      <b>Instructor Percentage <span class="font-monospace fw-light">[I]</span>:</b> {{ event.instructor_percentage }}
     </p>
-  {% render_table table "membershipworks/tables/invoice_table.dj.html" %}
-{% endblock %}
+  </div>
+  <div class="vr d-none d-md-block m-4 p-0"></div>
+  <div class="col-12 col-md-4">
+    <div>
+      <h3>Remit to:</h3>
+      <div>{{ event.instructor.member.account_name }}</div>
+      <div>{{ event.instructor.member.address_street }}</div>
+      <div>
+        {{ event.instructor.member.address_city }},
+        {{ event.instructor.member.address_state_province }}
+        {{ event.instructor.member.address_postal_code }}
+      </div>
+      <div>{{ event.instructor.member.email }}</div>
+    </div>
+  </div>
+</div>
+{% render_table table "membershipworks/tables/invoice_table.dj.html" %}

membershipworks/templates/membershipworks/event_invoice_pdf.dj.html

@@ -0,0 +1,29 @@
+{% load static %}
+
+{% load nh3_tags %}
+
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport"
+        content="width=device-width, initial-scale=1, shrink-to-fit=no">
+  <!-- Bootstrap CSS -->
+  <link href="{% static 'bootstrap.min.css' %}" rel="stylesheet">
+  <link rel="stylesheet" href="{% static "membershipworks/css/event_invoice_pdf.css" %}" media="print">
+  <title>Event Invoice for {{ event.details.ttl|nh3 }}</title>
+</head>
+
+<body style="font-size: 10pt;">
+  <header>
+    <div>TwinState MakerSpaces, Inc.</div>
+    <div>PO Box 100</div>
+    <div>Lebanon, NH 03766-0100</div>
+  </header>
+  <footer>
+    <div class="left">Generated for {{ user }} on {{ now|date:"Y-m-d" }} {{ now|time:"H:i T" }} by CMSManage</div>
+    <div class="right">
+      Invoice ID: <span class="font-monospace text-nowrap">{{ invoice_uuid }}</span>
+    </div>
+  </footer>
+
+  {% include "membershipworks/event_invoice.dj.html" %}
+</body>

membershipworks/templates/membershipworks/user_event_list.dj.html

@@ -0,0 +1,10 @@
+{% extends "base.dj.html" %}
+
+{% load render_table from django_tables2 %}
+
+{% block title %}My Events{% endblock %}
+{% block content %}
+  {% include "cmsmanage/components/download_table.dj.html" %}
+
+  {% render_table table %}
+{% endblock %}

membershipworks/urls.py

@@ -31,9 +31,19 @@ urlpatterns = [
         name="event-month-report",
     ),
     path(
-        "event-invoice/<eid>",
-        views.EventInvoiceView.as_view(),
-        name="event-invoice",
+        "my-events/",
+        views.UserEventView.as_view(),
+        name="user-events",
+    ),
+    path(
+        "event/<eid>",
+        views.EventDetailView.as_view(),
+        name="event-detail",
+    ),
+    path(
+        "event/invoice/<uuid:uuid>.pdf",
+        views.EventInvoicePDFView.as_view(),
+        name="event-invoice-pdf",
     ),
     path(
         "event-attendees",

membershipworks/views.py

@@ -1,13 +1,24 @@
+import uuid
 from datetime import datetime, timedelta
+from typing import Any
 
 from django.conf import settings
 from django.contrib import messages
 from django.contrib.auth.decorators import permission_required
-from django.contrib.auth.mixins import PermissionRequiredMixin
+from django.contrib.auth.mixins import (
+    AccessMixin,
+    PermissionRequiredMixin,
+)
+from django.core import mail
+from django.core.files.base import ContentFile
 from django.db.models import OuterRef, Q, Subquery
 from django.db.models.functions import TruncMonth, TruncYear
+from django.http import HttpRequest, HttpResponse
 from django.shortcuts import render
 from django.template.defaultfilters import floatformat
+from django.template.loader import render_to_string
+from django.utils import timezone
+from django.utils.functional import cached_property
 from django.utils.html import format_html
 from django.utils.safestring import SafeString
 from django.views.generic import DetailView, ListView
@@ -16,18 +27,25 @@ from django.views.generic.dates import (
     MonthArchiveView,
     YearArchiveView,
 )
+from django.views.generic.detail import BaseDetailView
+from django.views.generic.edit import FormMixin, ProcessFormView
 
 import django_filters
 import django_tables2 as tables
+import weasyprint
 from dal import autocomplete
 from django_filters.views import BaseFilterView
 from django_mysql.models import GroupConcat
+from django_sendfile import sendfile
 from django_tables2 import A, SingleTableMixin
 from django_tables2.export.views import ExportMixin
+from django_weasyprint.utils import django_url_fetcher
 
 from membershipworks.membershipworks_api import MembershipWorks
 
-from .models import EventAttendee, EventExt, Member
+from .forms import EventInvoiceForm
+from .invoice_email import make_invoice_emails
+from .models import EventAttendee, EventExt, EventInvoice, Member
 
 
 class MemberAutocomplete(autocomplete.Select2QuerySetView):
@@ -137,7 +155,7 @@ class EventTable(tables.Table):
         template_code=(
             '<a title="MembershipWorks" href="https://membershipworks.com/admin/#!event/admin/{{ record.url }}">{{ value }}</a> '
             '<a title="Admin" href="{% url "admin:membershipworks_eventext_change" record.pk %}"><i class="bi bi-pencil-square"></i></a> '
-            '<a title="Invoice" href="{% url "membershipworks:event-invoice" record.pk %}"><i class="bi bi-receipt"></i></a> '
+            '<a title="Details" href="{% url "membershipworks:event-detail" record.pk %}"><i class="bi bi-receipt"></i></a> '
         ),
         accessor="unescaped_title",
     )
@@ -149,6 +167,8 @@ class EventTable(tables.Table):
     gross_revenue = tables.Column()
     total_due_to_instructor = tables.Column()
     net_revenue = tables.Column()
+    invoice__date_submitted = tables.DateColumn(verbose_name="Invoice Submitted")
+    invoice__date_paid = tables.DateColumn(verbose_name="Invoice Paid")
 
     class Meta:
         model = EventExt
@@ -275,7 +295,7 @@ class EventMonthReport(
         return (
             super()
             .get_table_data()
-            .select_related("category", "instructor")
+            .select_related("category", "instructor", "invoice")
             .with_financials()
         )
 
@@ -283,6 +303,42 @@ class EventMonthReport(
         return f"mw_events_{self.get_year()}-{self.get_month():02}.{export_format}"
 
 
+class UserEventTable(EventTable):
+    title = tables.Column(linkify=True, accessor="unescaped_title")
+    instructor = None
+    person_hours = None
+    gross_revenue = None
+    net_revenue = None
+
+
+class UserEventView(SingleTableMixin, ListView):
+    model = EventExt
+    table_class = UserEventTable
+    export_formats = ("csv", "xlsx", "ods")
+    template_name = "membershipworks/user_event_list.dj.html"
+
+    @cached_property
+    def member(self) -> Member | None:
+        return Member.from_user(self.request.user)
+
+    def get_queryset(self):
+        if self.member is None:
+            return self.model.objects.none()
+        else:
+            return super().get_queryset().filter(instructor__member=self.member)
+
+    def get_table_data(self):
+        return (
+            super()
+            .get_table_data()
+            .select_related("category", "instructor", "invoice")
+            .with_financials()
+        )
+
+    def get_export_filename(self, export_format):
+        return f"my_events_{self.member.uid if self.member is not None else 'no-uid'}.{export_format}"
+
+
 class InvoiceMoneyColumn(tables.columns.Column):
     def render(self, value):
         return f"${super().render(value):.2f}"
@@ -333,26 +389,142 @@ class InvoiceTable(tables.Table):
 
     class Meta:
         attrs = {
+            "class": "table table-sm mx-auto w-auto",
             "tbody": {"class": "table-group-divider"},
             "tfoot": {"class": "table-group-divider"},
         }
         orderable = False
 
 
-class EventInvoiceView(SingleTableMixin, PermissionRequiredMixin, DetailView):
+class EventDetailView(
+    SingleTableMixin, FormMixin, AccessMixin, DetailView, ProcessFormView
+):
     permission_required = "membershipworks.view_eventext"
     queryset = EventExt.objects.with_financials().all()
     pk_url_kwarg = "eid"
     context_object_name = "event"
-    template_name = "membershipworks/event_invoice.dj.html"
+    template_name = "membershipworks/event_detail.dj.html"
     table_pagination = False
     table_class = InvoiceTable
+    form_class = EventInvoiceForm
+
+    def render_to_response(
+        self, context: dict[str, Any], **response_kwargs: Any
+    ) -> HttpResponse:
+        if self.request.user.has_perm(
+            self.permission_required
+        ) or self.object.user_is_instructor(self.request.user):
+            return super().render_to_response(context, **response_kwargs)
+        else:
+            return self.handle_no_permission()
+
+    def display_instructor_version(self):
+        return (
+            self.request.method == "POST"  # generating a PDF
+            or not self.request.user.has_perm(self.permission_required)
+            or self.request.GET.get("instructor_view")
+        )
 
     def get_table_data(self):
+        if self.display_instructor_version():
+            return self.object.ticket_types.group_by_ticket_type()
+        else:
             return self.object.ticket_types.all()
 
     def get_table_kwargs(self):
-        return {"event": self.object}
+        kwargs = super().get_table_kwargs()
+
+        kwargs["event"] = self.object
+        if self.display_instructor_version():
+            kwargs["exclude"] = [
+                "list_price",
+            ]
+
+        return kwargs
+
+    def get_success_url(self):
+        return self.request.build_absolute_uri()
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["user_is_instructor"] = self.object.user_is_instructor(
+            self.request.user
+        )
+        return context
+
+    def post(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        return super().post(request, *args, **kwargs)
+
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs["event"] = self.object
+        kwargs["user"] = self.request.user
+        return kwargs
+
+    def form_valid(self, form: EventInvoiceForm):
+        self.object = self.get_object()
+        event = self.object
+
+        invoice_uuid = uuid.uuid4()
+
+        pdf_context = self.get_context_data(object=event)
+        pdf_context.update({"now": timezone.now(), "invoice_uuid": invoice_uuid})
+        weasy_html = weasyprint.HTML(
+            string=render_to_string(
+                "membershipworks/event_invoice_pdf.dj.html",
+                context=pdf_context,
+                request=self.request,
+            ),
+            url_fetcher=django_url_fetcher,
+            base_url="file://",
+        )
+        pdf = weasy_html.write_pdf()
+        # the result will be None only if a target was provided
+        assert pdf is not None
+
+        # NOTE: this is only saved AFTER the emails are successfully sent
+        invoice = EventInvoice(
+            uuid=invoice_uuid,
+            event=event,
+            # NOTE: this needs to be resolved before the object is
+            # saved, so cannot use the Now() db function
+            date_submitted=timezone.now(),
+            amount=event.total_due_to_instructor,
+        )
+        # removed), currently used in event_invoice_admin.dj.html.
+
+        emails = make_invoice_emails(
+            invoice, pdf, self.request.build_absolute_uri(event.get_absolute_url())
+        )
+        with mail.get_connection() as conn:
+            conn.send_messages(emails)
+
+        # this also saves the invoice object
+        invoice.pdf.save(f"{event.eid}.pdf", ContentFile(pdf))
+
+        messages.success(
+            self.request,
+            "Created Invoice! You should receive a confirmation email shortly.",
+        )
+
+        return super().form_valid(form)
+
+
+class EventInvoicePDFView(AccessMixin, BaseDetailView):
+    model = EventInvoice
+    pk_url_kwarg = "uuid"
+
+    def get(self, request: HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse:
+        invoice = self.get_object()
+        if request.user.has_perm(
+            "membershipworks.view_eventinvoice"
+        ) or invoice.event.user_is_instructor(request.user):
+            # return HttpResponse(invoice.pdf.path)
+            return sendfile(request, invoice.pdf.path, mimetype="application/pdf")
+
+        else:
+            return self.handle_no_permission()
 
 
 class EventAttendeeTable(tables.Table):

pdm.lock

@@ -5,7 +5,7 @@
 groups = ["default", "debug", "lint", "server", "typing", "dev"]
 strategy = ["cross_platform"]
 lock_version = "4.4.1"
-content_hash = "sha256:b6c73855da789a2433a99ac698bd3e7d16ad5a37170752043afd14ca9212f228"
+content_hash = "sha256:8d03a3352b70059a88842e3f316ee61450b7690e39a4516b7ce8ebf22aaae5b2"
 
 [[package]]
 name = "aiohttp"
@@ -659,6 +659,18 @@ files = [
     {file = "django_recurrence-1.11.1-py3-none-any.whl", hash = "sha256:0c65f30872599b5813a9bab6952dada23c55894f28674490a753ada559f14bc5"},
 ]
 
+[[package]]
+name = "django-sendfile2"
+version = "0.7.1"
+summary = "Abstraction to offload file uploads to web-server (e.g. Apache with mod_xsendfile) once Django has checked permissions etc."
+dependencies = [
+    "django",
+]
+files = [
+    {file = "django-sendfile2-0.7.1.tar.gz", hash = "sha256:b5bec07f1c9b1875a60ea74beb306e9aba964bd8b54f00b4432cb77cc35bc58c"},
+    {file = "django_sendfile2-0.7.1-py3-none-any.whl", hash = "sha256:81971df1db77f688c4834b8540930902d0d929c64cf374bd604b81f5ac52c04a"},
+]
+
 [[package]]
 name = "django-stubs"
 version = "4.2.7"
@@ -717,6 +729,20 @@ files = [
     {file = "django_tables2-2.7.0-py2.py3-none-any.whl", hash = "sha256:99e06d966ca8ac69fd74092eb45c79a280dd5ca0ccb81395d96261f62128e1af"},
 ]
 
+[[package]]
+name = "django-weasyprint"
+version = "2.3.0"
+requires_python = ">=3.8"
+summary = "Django WeasyPrint CBV"
+dependencies = [
+    "Django>=3.2",
+    "WeasyPrint>=53",
+]
+files = [
+    {file = "django-weasyprint-2.3.0.tar.gz", hash = "sha256:2f849e15bfd6c1b2a58512097b9042eddf3533651d37d2e096cd6f7d8be6442b"},
+    {file = "django_weasyprint-2.3.0-py3-none-any.whl", hash = "sha256:807cb3b16332123d97c8bbe2ac9c70286103fe353235351803ffd33b67284735"},
+]
+
 [[package]]
 name = "django-widget-tweaks"
 version = "1.5.0"

pyproject.toml

@@ -35,6 +35,8 @@ dependencies = [
     "django-filter~=24.2",
     "django-db-views~=0.1",
     "django-mysql~=4.12",
+    "django-weasyprint~=2.3",
+    "django-sendfile2~=0.7",
     "django-bootstrap5~=23.4",
 ]
 requires-python = ">=3.11"