Refactor email generation to use a class-based design like Django views
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cmsmanage/email.py
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81
cmsmanage/email.py
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from collections.abc import Sequence
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from typing import Any, ClassVar, TypeAlias
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from django.core import mail
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from django.template import loader
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import mdformat
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from markdownify import markdownify
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Context: TypeAlias = dict[str, Any]
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class EmailBase:
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subject: ClassVar[str]
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from_email: ClassVar[str | None] = None
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reply_to: ClassVar[Sequence[str] | None] = None
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context: Context
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def __init__(self, context: Context) -> None:
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self.context = context
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def render_body(self) -> str:
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raise NotImplementedError
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@classmethod
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def render(
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cls,
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context: Context,
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to: list[str] | None = None,
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cc: list[str] | None = None,
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bcc: list[str] | None = None,
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) -> mail.EmailMessage:
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self = cls(context)
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body = self.render_body()
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return mail.EmailMessage(
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self.subject,
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body,
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from_email=self.from_email,
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reply_to=self.reply_to,
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to=to,
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cc=cc,
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bcc=bcc,
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)
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class TemplatedMultipartEmail(EmailBase):
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template: ClassVar[str]
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def render_html_body(self) -> str:
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template = loader.get_template(self.template)
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return template.render(self.context)
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def render_body(self, html_body: str) -> str:
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return mdformat.text(markdownify(html_body), extensions={"tables"})
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@classmethod
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def render(
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cls,
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context: Context,
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to: list[str] | None = None,
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cc: list[str] | None = None,
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bcc: list[str] | None = None,
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) -> mail.EmailMessage:
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self = cls(context)
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html_body = self.render_html_body()
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plain_body = self.render_body(html_body)
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return mail.EmailMultiAlternatives(
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self.subject,
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plain_body,
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from_email=self.from_email,
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reply_to=self.reply_to,
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to=to,
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cc=cc,
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bcc=bcc,
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alternatives=[(html_body, "text/html")],
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)
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@ -1,58 +1,53 @@
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from django.conf import settings
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from django.core.mail import EmailMessage, EmailMultiAlternatives
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from django.template import loader
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import mdformat
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from markdownify import markdownify
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from django.core.mail import EmailMessage
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from cmsmanage.email import TemplatedMultipartEmail
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from membershipworks.models import EventInvoice
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def make_multipart_email(
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subject: str, html_body: str, to: tuple[str]
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) -> EmailMultiAlternatives:
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plain_body = mdformat.text(markdownify(html_body), extensions={"tables"})
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email = EmailMultiAlternatives(
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subject,
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plain_body,
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from_email="CMS Invoices <invoices@claremontmakerspace.org>",
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to=to,
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reply_to=["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"],
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)
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email.attach_alternative(html_body, "text/html")
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return email
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class InvoiceEmailBase(TemplatedMultipartEmail):
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from_email = "CMS Invoices <invoices@claremontmakerspace.org>"
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reply_to = ["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"]
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def make_instructor_email(
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invoice: EventInvoice, pdf: bytes, event_url: str
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) -> EmailMessage:
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class InstructorInvoiceEmail(InvoiceEmailBase):
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template = "membershipworks/email/event_invoice_instructor.dj.html"
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@property
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def subject(self) -> str:
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event = self.context["invoice"].event
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return f'Your CMS instructor invoice has been received for event "{event}" {event.start} - {event.end}'
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@classmethod
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def render_for_invoice(
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cls, invoice: EventInvoice, pdf: bytes, event_url: str
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) -> EmailMessage:
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if invoice.event.instructor is None or invoice.event.instructor.member is None:
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raise ValueError("Event Instructor not defined or is not member")
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template = loader.get_template(
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"membershipworks/email/event_invoice_instructor.dj.html"
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)
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html_body = template.render({"invoice": invoice, "event_url": event_url})
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message = make_multipart_email(
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f'Your CMS instructor invoice has been received for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
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html_body,
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(invoice.event.instructor.member.sanitized_mailbox(),),
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message = cls.render(
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{"invoice": invoice, "event_url": event_url},
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to=[invoice.event.instructor.member.sanitized_mailbox()],
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)
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message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
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return message
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def make_admin_email(invoice: EventInvoice, pdf: bytes, event_url: str) -> EmailMessage:
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template = loader.get_template("membershipworks/email/event_invoice_admin.dj.html")
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html_body = template.render({"invoice": invoice, "event_url": event_url})
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class AdminInvoiceEmail(InvoiceEmailBase):
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template = "membershipworks/email/event_invoice_admin.dj.html"
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message = make_multipart_email(
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f'CMS instructor invoice created for event "{invoice.event}" {invoice.event.start} - {invoice.event.end}',
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html_body,
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@property
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def subject(self) -> str:
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event = self.context["invoice"].event
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return f'CMS instructor invoice created for event "{event}" {event.start} - {event.end}'
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@classmethod
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def render_for_invoice(
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cls, invoice: EventInvoice, pdf: bytes, event_url: str
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) -> EmailMessage:
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message = cls.render(
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{"invoice": invoice, "event_url": event_url},
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# TODO: should this be in database instead?
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settings.INVOICE_HANDLERS,
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to=settings.INVOICE_HANDLERS,
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)
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message.attach(f"CMS_event_invoice_{invoice.uuid}.pdf", pdf, "application/pdf")
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return message
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@ -62,6 +57,6 @@ def make_invoice_emails(
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invoice: EventInvoice, pdf: bytes, event_url: str
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) -> list[EmailMessage]:
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return [
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make_instructor_email(invoice, pdf, event_url),
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make_admin_email(invoice, pdf, event_url),
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InstructorInvoiceEmail.render_for_invoice(invoice, pdf, event_url),
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AdminInvoiceEmail.render_for_invoice(invoice, pdf, event_url),
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]
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@ -1,93 +1,114 @@
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from abc import abstractmethod
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from collections.abc import Iterable, Iterator
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from itertools import groupby
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from django.contrib.auth import get_user_model
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from django.core import mail
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from django.core.mail.message import sanitize_address
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from django.template import loader
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from django.db.models import QuerySet
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import mdformat
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from markdownify import markdownify
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from cmsmanage.email import TemplatedMultipartEmail
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from membershipworks.models import Member
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from paperwork.models import Certification, Department
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def make_multipart_email(subject, html_body, to):
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plain_body = mdformat.text(markdownify(html_body), extensions={"tables"})
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class CertificationEmailBase(TemplatedMultipartEmail):
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from_email = "Claremont MakerSpace Member Certification System <Certifications@ClaremontMakerSpace.org>"
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reply_to = ["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"]
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email = mail.EmailMultiAlternatives(
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subject,
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plain_body,
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"Claremont MakerSpace Member Certification System <Certifications@ClaremontMakerSpace.org>",
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to,
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reply_to=["Claremont MakerSpace <Info@ClaremontMakerSpace.org>"],
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)
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email.attach_alternative(html_body, "text/html")
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return email
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@classmethod
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@abstractmethod
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def render_for_certifications(
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cls, ordered_certifications: QuerySet[Certification]
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) -> Iterable[mail.EmailMessage]:
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raise NotImplementedError
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def make_department_email(department, certifications):
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template = loader.get_template("paperwork/email/department_certifications.dj.html")
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class DepartmentCertificationEmail(CertificationEmailBase):
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template = "paperwork/email/department_certifications.dj.html"
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@property
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def subject(self) -> str:
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certification_count = len(self.context["certifications"])
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return f"{certification_count} new CMS Certifications issued for {self.context['department']}"
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@classmethod
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def render_for_department(
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cls, department: Department, certifications: Iterator[Certification]
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) -> Iterable[mail.EmailMessage]:
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if department.shop_lead_flag is not None:
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shop_leads = department.shop_lead_flag.members.values_list(
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"first_name", "account_name", "email", named=True
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)
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html_body = template.render(
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yield cls.render(
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{
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"shop_lead_names": [shop_lead.first_name for shop_lead in shop_leads],
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"shop_lead_names": [
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shop_lead.first_name for shop_lead in shop_leads
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],
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"department": department,
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"certifications": certifications,
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}
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)
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return make_multipart_email(
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f"{len(certifications)} new CMS Certifications issued for {department}",
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html_body,
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"certifications": list(certifications),
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},
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to=[
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sanitize_address((shop_lead.account_name, shop_lead.email), "ascii")
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for shop_lead in shop_leads
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],
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)
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def department_emails(ordered_queryset):
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@classmethod
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def render_for_certifications(
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cls, ordered_certifications: QuerySet[Certification]
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) -> Iterable[mail.EmailMessage]:
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certifications_by_department = groupby(
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ordered_queryset, lambda c: c.certification_version.definition.department
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ordered_certifications,
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lambda c: c.certification_version.definition.department,
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)
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for department, certifications in certifications_by_department:
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if department.shop_lead_flag is not None:
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yield make_department_email(department, list(certifications))
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yield from cls.render_for_department(department, certifications)
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def make_member_email(member, certifications):
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template = loader.get_template("paperwork/email/member_certifications.dj.html")
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class MemberCertificationEmail(CertificationEmailBase):
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template = "paperwork/email/member_certifications.dj.html"
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html_body = template.render({"member": member, "certifications": certifications})
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@property
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def subject(self) -> str:
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return f"You have been issued {len(self.context['certifications'])} new CMS Certifications"
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return make_multipart_email(
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f"You have been issued {len(certifications)} new CMS Certifications",
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html_body,
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@classmethod
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def render_for_member(
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cls, member: Member, certifications: list[Certification]
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) -> mail.EmailMessage:
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return cls.render(
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{"member": member, "certifications": certifications},
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to=[sanitize_address((member.account_name, member.email), "ascii")],
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)
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def member_emails(ordered_queryset):
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@classmethod
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def render_for_certifications(
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cls, ordered_certifications: QuerySet[Certification]
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) -> Iterable[mail.EmailMessage]:
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certifications_by_member = groupby(
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ordered_queryset.filter(member__isnull=False), lambda c: c.member
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ordered_certifications.filter(member__isnull=False), lambda c: c.member
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)
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for member, certifications in certifications_by_member:
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yield make_member_email(member, list(certifications))
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yield cls.render_for_member(member, list(certifications))
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def admin_email(ordered_queryset):
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template = loader.get_template("paperwork/email/admin_certifications.dj.html")
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html_body = template.render({"certifications": ordered_queryset})
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class AdminCertificationEmail(CertificationEmailBase):
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template = "paperwork/email/admin_certifications.dj.html"
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return make_multipart_email(
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f"{len(ordered_queryset)} new CMS Certifications issued",
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html_body,
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to=(
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get_user_model()
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@property
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def subject(self) -> str:
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return f"{len(self.context['certifications'])} new CMS Certifications issued"
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@classmethod
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def render_for_certifications(
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cls, ordered_certifications: QuerySet[Certification]
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) -> Iterable[mail.EmailMessage]:
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yield cls.render(
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{"certifications": ordered_certifications},
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to=get_user_model()
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.objects.with_perm(
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"paperwork.receive_certification_emails",
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include_superusers=False,
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@ -95,16 +116,18 @@ def admin_email(ordered_queryset):
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# TODO: LDAPBackend does not support with_perm() directly
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backend="django.contrib.auth.backends.ModelBackend",
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)
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.values_list("email", flat=True)
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),
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.values_list("email", flat=True),
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)
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def all_certification_emails(queryset):
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def all_certification_emails(queryset: QuerySet[Certification]):
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ordered_queryset = queryset.select_related(
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"certification_version__definition"
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).order_by("certification_version__definition__department")
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yield from department_emails(ordered_queryset)
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yield from member_emails(ordered_queryset)
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yield admin_email(ordered_queryset)
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for email_type in [
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DepartmentCertificationEmail,
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MemberCertificationEmail,
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AdminCertificationEmail,
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]:
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yield from email_type.render_for_certifications(ordered_queryset)
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