Netlify adapter (#2879)

* Netlify adapter

* Remove package.json export that doesnt exist

* Fix out path

* Make netlifyFunctions the default

* Make the dist configurable

* Add an export for the functions

* Append of the file exists

1 files changed, 64 insertions, 0 deletions

diff --git a/packages/integrations/netlify/src/index.ts b/packages/integrations/netlify/src/index.ts
new file mode 100644
index 000000000..4ddacfaf2
--- /dev/null
+++ b/packages/integrations/netlify/src/index.ts
@@ -0,0 +1,64 @@
+import type { AstroAdapter, AstroIntegration, AstroConfig } from 'astro';
+import fs from 'fs';
+
+export function getAdapter(site: string | undefined): AstroAdapter {
+	return {
+		name: '@astrojs/netlify',
+		serverEntrypoint: '@astrojs/netlify/netlify-functions.js',
+		exports: ['handler'],
+		args: { site }
+	};
+}
+
+interface NetlifyFunctionsOptions {
+	dist?: URL;
+}
+
+function netlifyFunctions({ dist }: NetlifyFunctionsOptions = {}): AstroIntegration {
+	let _config: AstroConfig;
+	let entryFile: string;
+	return {
+		name: '@astrojs/netlify',
+		hooks: {
+			'astro:config:setup': ({ config }) => {
+				if(dist) {
+					config.dist = dist;
+				} else {
+					config.dist = new URL('./netlify/', config.projectRoot);
+				}
+			},
+			'astro:config:done': ({ config, setAdapter }) => {
+				setAdapter(getAdapter(config.buildOptions.site));
+				_config = config;
+			},
+			'astro:build:start': async({ buildConfig }) => {
+				entryFile = buildConfig.serverEntry.replace(/\.m?js/, '');
+				buildConfig.client = _config.dist;
+				buildConfig.server = new URL('./functions/', _config.dist);
+			},
+			'astro:build:done': async ({ routes, dir }) => {
+				const _redirectsURL = new URL('./_redirects', dir);
+
+				// Create the redirects file that is used for routing.
+				let _redirects = '';
+				for(const route of routes) {
+					if(route.pathname) {
+						_redirects += `
+${route.pathname}    /.netlify/functions/${entryFile}    200`
+					}
+				}
+
+				if(fs.existsSync(_redirects)) {
+					await fs.promises.appendFile(_redirectsURL, _redirects, 'utf-8');
+				} else {
+					await fs.promises.writeFile(_redirectsURL, _redirects, 'utf-8');
+				}
+			}
+		},
+	};
+}
+
+export {
+	netlifyFunctions,
+	netlifyFunctions as default
+};