feat(v11-i): footer CTA infolettre + endpoint /api/subscribe Kit V4

src/pages/api/subscribe.ts

@@ -0,0 +1,71 @@
+import type { APIRoute } from 'astro'
+
+export const prerender = false
+
+const KIT_API_BASE = 'https://api.kit.com/v4'
+
+export const POST: APIRoute = async ({ request }) => {
+  const KIT_API_KEY = import.meta.env.KIT_API_SECRET_V4
+  if (!KIT_API_KEY) {
+    return new Response(JSON.stringify({ error: 'config_missing' }), {
+      status: 500,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  let body: { email: string; first_name?: string }
+  try {
+    body = await request.json()
+  } catch {
+    return new Response(JSON.stringify({ error: 'invalid_json' }), {
+      status: 400,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  const email = (body.email || '').trim().toLowerCase()
+  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
+    return new Response(JSON.stringify({ error: 'invalid_email' }), {
+      status: 400,
+      headers: { 'Content-Type': 'application/json' },
+    })
+  }
+
+  try {
+    const upstream = await fetch(`${KIT_API_BASE}/subscribers`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Kit-Api-Key': KIT_API_KEY,
+      },
+      body: JSON.stringify({
+        email_address: email,
+        first_name: body.first_name || undefined,
+        state: 'active',
+      }),
+      signal: AbortSignal.timeout(10000),
+    })
+
+    if (upstream.ok) {
+      return new Response(JSON.stringify({ ok: true }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    }
+    if (upstream.status === 422) {
+      return new Response(JSON.stringify({ ok: true, already: true }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    }
+    return new Response(
+      JSON.stringify({ error: 'kit_failed', status: upstream.status }),
+      { status: 502, headers: { 'Content-Type': 'application/json' } }
+    )
+  } catch (e) {
+    return new Response(
+      JSON.stringify({ error: 'upstream_failed', detail: (e as Error).message }),
+      { status: 502, headers: { 'Content-Type': 'application/json' } }
+    )
+  }
+}