feat: build the /admin and /admin/login pages

src/routes/admin/+layout.server.ts

@@ -0,0 +1,16 @@
+import { redirect } from "@sveltejs/kit";
+import type { LayoutServerLoad } from "./$types.js";
+import { CookieAuthentication } from "$lib/blog/auth/CookieAuthentication.js";
+
+export const load: LayoutServerLoad = ({ cookies, route }) => {
+  const auth = new CookieAuthentication(cookies)
+  const isAuthd = auth.isAuthdAsAdmin
+
+  if (route.id === '/admin/login' && isAuthd) {
+    return redirect(307, '/admin')
+  } else if (!isAuthd && route.id !== '/admin/login') {
+    return redirect(307, '/admin/login')
+  }
+
+  return {}
+}

src/routes/admin/+page.svelte

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+<h1>Welcome home, Wilson</h1>

src/routes/admin/login/+page.server.ts

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+import { PRIVATE_ADMIN_AUTH_TOKEN } from "$env/static/private";
+import { redirect } from "@sveltejs/kit";
+import type { Actions} from "./$types.js";
+import { CookieAuthentication } from "$lib/blog/auth/CookieAuthentication.js";
+
+export const actions = {
+  default: async ({cookies, request}) => {
+    const formData = await request.formData()
+    const token = formData.get('token')
+
+    const isAuthd = PRIVATE_ADMIN_AUTH_TOKEN === token;
+    const auth = new CookieAuthentication(cookies)
+
+    auth.setAdminAuthentication(isAuthd)
+
+    if (isAuthd) {
+      return redirect(307, '/admin')
+    }
+
+    return {
+      isAuthd
+    }
+  }
+
+} satisfies Actions

src/routes/admin/login/+page.svelte

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+<h1>Admin login</h1>
+
+<form method="POST">
+  <div class="field">
+    <label for="token">API Token</label>
+    <input type="password" id="token" name="token" />
+  </div>
+  <div class="field">
+    <input type="submit" value="Login">
+  </div>
+</form>