feat: add new mail tools for admining

src/central_command/settings.py

@@ -53,6 +53,7 @@
     "persistence",
     "baby_serverlist",
     "drf_spectacular",
+    "mail_tools",
 ]
 
 # What user model to use for authentication?

src/central_command/urls.py

@@ -26,4 +26,5 @@
     path("accounts/", include("accounts.api.urls", "Accounts API")),
     path("persistence/", include("persistence.api.urls")),
     path("baby-serverlist/", include("baby_serverlist.api.urls")),
+    path("mail-tools/", include("mail_tools.urls")),
 ]

src/mail_tools/__init__.py

@@ -0,0 +1 @@
+default_app_config = "mail_tools.apps.MailToolsConfig"

src/mail_tools/apps.py

@@ -0,0 +1,10 @@
+from django.apps import AppConfig
+
+
+class MailToolsConfig(AppConfig):
+    name = "mail_tools"
+    verbose_name = "Mail Tools"
+
+    def ready(self) -> None:
+        # Ensure registry entries are loaded on startup.
+        from . import registry  # noqa: F401

src/mail_tools/forms.py

@@ -0,0 +1,52 @@
+from collections.abc import Iterable
+from typing import cast
+
+from django import forms
+
+from accounts.models import Account
+
+from .registry import TemplatePreview, broadcastable_previews, get_preview
+
+
+def _preview_choices() -> Iterable[tuple[str, str]]:
+    return [(preview.slug, preview.label) for preview in broadcastable_previews()]
+
+
+class BroadcastEmailForm(forms.Form):
+    template_slug = forms.ChoiceField(label="Template")
+    subject = forms.CharField(label="Subject", max_length=120)
+    body_html = forms.CharField(
+        label="Body (HTML)",
+        widget=forms.HiddenInput(),
+        required=False,
+        help_text="Optional rich text body injected into the template (used by the info template).",
+    )
+    recipients = forms.ModelMultipleChoiceField(
+        label="Recipients",
+        queryset=Account.objects.none(),
+        widget=forms.SelectMultiple(attrs={"size": 12}),
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        template_field = cast(forms.ChoiceField, self.fields["template_slug"])
+        template_field.choices = list(_preview_choices())
+        recipients_field = cast(forms.ModelMultipleChoiceField, self.fields["recipients"])
+        recipients_field.queryset = Account.objects.order_by("email")
+        self.preview: TemplatePreview | None = None
+
+    def clean_template_slug(self) -> str:
+        slug = self.cleaned_data["template_slug"]
+        try:
+            preview = get_preview(slug)
+        except LookupError as exc:
+            raise forms.ValidationError(str(exc))
+        if not preview.allow_broadcast:
+            raise forms.ValidationError("This template cannot be used for manual sending.")
+        self.preview = preview
+        return slug
+
+    def get_preview(self) -> TemplatePreview:
+        if self.preview is None:
+            raise ValueError("Preview not set. Did you call is_valid()?")
+        return self.preview

src/mail_tools/registry.py

@@ -0,0 +1,92 @@
+from __future__ import annotations
+
+from collections.abc import Iterable
+from copy import deepcopy
+from dataclasses import dataclass
+from typing import Any, Optional
+
+from django.conf import settings
+
+
+@dataclass(frozen=True)
+class TemplatePreview:
+    slug: str
+    label: str
+    template_name: str
+    context: dict[str, Any]
+    allow_broadcast: bool = False
+
+    def build_context(
+        self,
+        *,
+        user_name: Optional[str] = None,
+        overrides: Optional[dict[str, Any]] = None,
+    ) -> dict[str, Any]:
+        data = deepcopy(self.context)
+        if user_name:
+            data["user_name"] = user_name
+        if overrides:
+            data.update({k: v for k, v in overrides.items() if v not in (None, "")})
+        return data
+
+
+_registry: dict[str, TemplatePreview] = {}
+
+
+def register(preview: TemplatePreview) -> None:
+    if preview.slug in _registry:
+        raise ValueError(f"Duplicate mail preview slug '{preview.slug}'")
+    _registry[preview.slug] = preview
+
+
+def all_previews() -> Iterable[TemplatePreview]:
+    return _registry.values()
+
+
+def broadcastable_previews() -> Iterable[TemplatePreview]:
+    return (preview for preview in _registry.values() if preview.allow_broadcast)
+
+
+def get_preview(slug: str) -> TemplatePreview:
+    try:
+        return _registry[slug]
+    except KeyError as exc:
+        raise LookupError(f"No mail preview registered for '{slug}'") from exc
+
+
+register(
+    TemplatePreview(
+        slug="confirm-account",
+        label="Account confirmation",
+        template_name="confirm_template.html",
+        context={
+            "user_name": "Alex Crew",
+            "link": f"{settings.ACCOUNT_CONFIRMATION_URL}?token=example-token",
+        },
+    )
+)
+
+register(
+    TemplatePreview(
+        slug="password-reset",
+        label="Password reset",
+        template_name="password_reset.html",
+        context={
+            "user_name": "Alex Crew",
+            "link": f"{settings.PASS_RESET_URL}?token=example-token",
+        },
+    )
+)
+
+register(
+    TemplatePreview(
+        slug="info",
+        label="Informational message",
+        template_name="info_template.html",
+        context={
+            "user_name": "Alex Crew",
+            "body_html": "<p>We wanted to let you know that scheduled maintenance will occur on <strong>Saturday at 18:00 UTC</strong>. Servers may be unavailable for roughly 30 minutes.</p><p>Thanks for your patience!</p>",
+        },
+        allow_broadcast=True,
+    )
+)

src/mail_tools/templates/mail_tools/broadcast.html

@@ -0,0 +1,143 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Broadcast email</title>
+    <style>
+        :root {
+            color-scheme: light;
+        }
+        body { font-family: "Segoe UI", Arial, sans-serif; background-color: #f4f6fb; margin: 0; padding: 32px; }
+        .container { max-width: 820px; margin: 0 auto; background: #fff; border-radius: 12px; padding: 32px; box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12); }
+        h1 { margin-top: 0; color: #111827; }
+        .field { margin-bottom: 22px; }
+        label { display: block; font-weight: 600; margin-bottom: 6px; color: #111827; }
+        input[type="text"], select { width: 100%; padding: 10px 12px; border: 1px solid #cbd5f5; border-radius: 8px; font-size: 14px; }
+        select[multiple] { min-height: 220px; }
+        .errorlist { margin: 4px 0 0; padding: 0; list-style: none; color: #b91c1c; font-size: 13px; }
+        button[type="submit"] { background-color: #2563eb; color: #fff; border: none; padding: 12px 24px; border-radius: 8px; font-weight: 600; cursor: pointer; }
+        button:disabled { opacity: 0.6; cursor: not-allowed; }
+        a { color: #2563eb; text-decoration: none; }
+        .editor-toolbar { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
+        .editor-toolbar button { background: #e0e7ff; border: 1px solid #c7d2fe; color: #1e1b4b; padding: 6px 12px; border-radius: 6px; font-size: 13px; cursor: pointer; }
+        .editor-toolbar button:hover { background: #c7d2fe; }
+        .rich-editor { border: 1px solid #cbd5f5; border-radius: 10px; padding: 12px; min-height: 200px; line-height: 1.5; font-size: 15px; background: #f8fafc; }
+        .rich-editor:focus { outline: 2px solid #6366f1; background: #fff; }
+        .rich-editor:empty:before { content: attr(data-placeholder); color: #94a3b8; }
+        .search-input { width: 100%; padding: 8px 10px; border: 1px solid #cbd5f5; border-radius: 6px; margin-bottom: 10px; font-size: 14px; }
+        small { color: #6b7280; display: block; margin-top: 4px; }
+        form .actions { margin-top: 28px; }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>Broadcast email</h1>
+        <p>Pick a template and send it to selected accounts. Only templates explicitly allowed for broadcasting will appear here.</p>
+        <p><a href="{% url 'mail_tools:list' %}">&larr; Back to templates</a></p>
+
+        <form method="post" id="broadcast-form">
+            {% csrf_token %}
+            <div class="field">
+                {{ form.template_slug.label_tag }}
+                {{ form.template_slug }}
+                {{ form.template_slug.errors }}
+            </div>
+
+            <div class="field">
+                {{ form.subject.label_tag }}
+                {{ form.subject }}
+                {{ form.subject.errors }}
+            </div>
+
+            <div class="field" id="editor-field">
+                <label for="rich-editor">Message body</label>
+                <noscript><small>Rich text editing requires JavaScript. Please enable it to compose a message.</small></noscript>
+                <div class="editor-toolbar" aria-label="Formatting toolbar">
+                    <button type="button" data-command="bold"><strong>B</strong></button>
+                    <button type="button" data-command="italic"><em>I</em></button>
+                    <button type="button" data-command="insertUnorderedList">• List</button>
+                    <button type="button" data-command="createLink">Link</button>
+                    <button type="button" data-command="removeFormat">Clear</button>
+                </div>
+                <div id="rich-editor" class="rich-editor" contenteditable="true" data-placeholder="Compose your optional message..."></div>
+                {{ form.body_html }}
+                {% if form.body_html.help_text %}
+                <small>{{ form.body_html.help_text }}</small>
+                {% endif %}
+                {{ form.body_html.errors }}
+            </div>
+
+            <div class="field">
+                <label for="recipient-filter">Recipients</label>
+                <input type="search" id="recipient-filter" class="search-input" placeholder="Filter recipients by email or username…" autocomplete="off">
+                {{ form.recipients }}
+                <small>Hold Ctrl/Cmd to select multiple recipients.</small>
+                {{ form.recipients.errors }}
+            </div>
+
+            {% if form.non_field_errors %}
+            <ul class="errorlist">
+                {% for error in form.non_field_errors %}
+                <li>{{ error }}</li>
+                {% endfor %}
+            </ul>
+            {% endif %}
+
+            <div class="actions">
+                <button type="submit">Send emails</button>
+            </div>
+        </form>
+    </div>
+
+    <script>
+        (function () {
+            const form = document.getElementById("broadcast-form");
+            const editor = document.getElementById("rich-editor");
+            const hiddenInput = document.getElementById("id_body_html");
+
+            const initial = hiddenInput.value || "";
+            if (initial) {
+                editor.innerHTML = initial;
+            }
+
+            const syncHidden = () => {
+                hiddenInput.value = editor.innerHTML.trim();
+            };
+
+            editor.addEventListener("input", syncHidden);
+            form.addEventListener("submit", syncHidden);
+
+            document.querySelector(".editor-toolbar").addEventListener("click", (event) => {
+                const button = event.target.closest("button[data-command]");
+                if (!button) {
+                    return;
+                }
+                event.preventDefault();
+                const command = button.dataset.command;
+                if (command === "createLink") {
+                    const url = prompt("Enter the URL");
+                    if (url) {
+                        document.execCommand("createLink", false, url);
+                    }
+                } else {
+                    document.execCommand(command, false, null);
+                }
+                editor.focus();
+                syncHidden();
+            });
+
+            const filterInput = document.getElementById("recipient-filter");
+            const recipientSelect = document.getElementById("id_recipients");
+
+            filterInput.addEventListener("input", () => {
+                const term = filterInput.value.trim().toLowerCase();
+                Array.from(recipientSelect.options).forEach((option) => {
+                    const text = option.text.toLowerCase();
+                    const value = option.value.toLowerCase();
+                    option.hidden = term && !text.includes(term) && !value.includes(term);
+                });
+            });
+        })();
+    </script>
+</body>
+</html>

src/mail_tools/templates/mail_tools/list.html

@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Mail templates</title>
+    <style>
+        body { font-family: "Segoe UI", Arial, sans-serif; background-color: #f4f6fb; margin: 0; padding: 32px; }
+        .container { max-width: 800px; margin: 0 auto; background: #fff; border-radius: 12px; padding: 32px; box-shadow: 0 10px 30px rgba(15, 23, 42, 0.12); }
+        h1 { margin-top: 0; color: #111827; }
+        ul { list-style: none; padding: 0; }
+        li { border: 1px solid #e5e7eb; border-radius: 10px; margin-bottom: 16px; padding: 16px; display: flex; justify-content: space-between; align-items: center; }
+        a { text-decoration: none; color: #2563eb; font-weight: 600; }
+        .badge { font-size: 12px; text-transform: uppercase; color: #6b7280; letter-spacing: 0.08em; }
+        .actions { display: flex; gap: 12px; }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>Mail template previews</h1>
+        <p>Select a template to render it with its sample context. Use the broadcast page to send informational emails.</p>
+        <p><a href="{% url 'mail_tools:broadcast' %}">Go to broadcast composer</a></p>
+        <ul>
+            {% for preview in previews %}
+            <li>
+                <div>
+                    <div>{{ preview.label }}</div>
+                    <div class="badge">{{ preview.slug }}</div>
+                </div>
+                <div class="actions">
+                    <a href="{% url 'mail_tools:detail' preview.slug %}">Preview</a>
+                </div>
+            </li>
+            {% empty %}
+            <li>No templates registered.</li>
+            {% endfor %}
+        </ul>
+    </div>
+</body>
+</html>

src/mail_tools/urls.py

@@ -0,0 +1,11 @@
+from django.urls import path
+
+from . import views
+
+app_name = "mail_tools"
+
+urlpatterns = [
+    path("", views.preview_list, name="list"),
+    path("preview/<slug:slug>/", views.preview_detail, name="detail"),
+    path("broadcast/", views.broadcast_email, name="broadcast"),
+]