feat(netlify): Netlify Adapter v4 (#84)

Co-authored-by: Matt Kane <m@mk.gg>
Co-authored-by: Jacklyn <70537879+jacklyn-net@users.noreply.github.com>
Co-authored-by: Arsh <69170106+lilnasy@users.noreply.github.com>
Co-authored-by: Emanuele Stoppa <602478+ematipico@users.noreply.github.com>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

1 files changed, 56 insertions, 0 deletions

diff --git a/packages/integrations/netlify/src/ssr-function.ts b/packages/integrations/netlify/src/ssr-function.ts
new file mode 100644
index 000000000..c2b6ed14c
--- /dev/null
+++ b/packages/integrations/netlify/src/ssr-function.ts
@@ -0,0 +1,56 @@
+import type { Context } from '@netlify/functions';
+import type { SSRManifest } from 'astro';
+import { App } from 'astro/app';
+import { applyPolyfills } from 'astro/app/node';
+
+applyPolyfills();
+
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface Args {}
+
+const clientAddressSymbol = Symbol.for('astro.clientAddress');
+
+export const createExports = (manifest: SSRManifest, _args: Args) => {
+	const app = new App(manifest);
+
+	function createHandler(integrationConfig: { cacheOnDemandPages: boolean }) {
+		return async function handler(request: Request, context: Context) {
+			const routeData = app.match(request);
+			Reflect.set(request, clientAddressSymbol, context.ip);
+
+			let locals: Record<string, unknown> = {};
+
+			if (request.headers.has('x-astro-locals')) {
+				locals = JSON.parse(request.headers.get('x-astro-locals')!);
+			}
+
+			locals.netlify = { context };
+
+			const response = await app.render(request, routeData, locals);
+
+			if (app.setCookieHeaders) {
+				for (const setCookieHeader of app.setCookieHeaders(response)) {
+					response.headers.append('Set-Cookie', setCookieHeader);
+				}
+			}
+
+			if (integrationConfig.cacheOnDemandPages) {
+				// any user-provided Cache-Control headers take precedence
+				const hasCacheControl = [
+					'Cache-Control',
+					'CDN-Cache-Control',
+					'Netlify-CDN-Cache-Control',
+				].some((header) => response.headers.has(header));
+
+				if (!hasCacheControl) {
+					// caches this page for up to a year
+					response.headers.append('CDN-Cache-Control', 'public, max-age=31536000, must-revalidate');
+				}
+			}
+
+			return response;
+		};
+	}
+
+	return { default: createHandler };
+};