netlify: add an edge function to handle redirects

.gitignore

@@ -6,3 +6,6 @@ transpiled/
 worker/
 .hugo_build.lock
 yarn.lock
+
+# Local Netlify folder
+.netlify

netlify.toml

@@ -4,3 +4,7 @@
 
 [build.environment]
   HUGO_VERSION = "0.104.3"
+
+[[edge_functions]]
+path = "/*"
+function = "root"

netlify/edge-functions/root.ts

@@ -0,0 +1,56 @@
+import type { Context } from "https://edge.netlify.com";
+
+const GITHUB_USERNAME = "msfjarvis";
+const APS_SLUG = "Android-Password-Store";
+const GITHUB_URL = `https://github.com`;
+const MY_GITHUB = `${GITHUB_URL}/${GITHUB_USERNAME}`;
+const APS_GITHUB_URL = `https://github.com/${APS_SLUG}/${APS_SLUG}`;
+
+export default async (request: Request, context: Context) => {
+  const url = new URL(request.url);
+  const urlParts = url.pathname.split("/").filter(entry => entry != "");
+  context.log(urlParts);
+  switch (urlParts[0]) {
+    case "g":
+      switch (urlParts.length) {
+        case 1:
+          return redirect(MY_GITHUB);
+        case 2:
+          return redirect(`${MY_GITHUB}/${urlParts[1]}`);
+        case 3:
+          return redirect(`${MY_GITHUB}/${urlParts[1]}/commit/${urlParts[2]}`);
+        case 4:
+          return redirect(`${MY_GITHUB}/${urlParts[1]}/issues/${urlParts[3]}`);
+      }
+    case "aps":
+      switch (urlParts.length) {
+        case 1:
+          return redirect(APS_GITHUB_URL);
+        case 2:
+          return redirect(`${APS_GITHUB_URL}/commit/${urlParts[1]}`);
+        case 3:
+          return redirect(`${APS_GITHUB_URL}/issues/${urlParts[2]}`);
+      }
+    case "apsg":
+      switch (urlParts.length) {
+        case 1:
+          return redirect(`${GITHUB_URL}/${APS_SLUG}`);
+        case 2:
+          return redirect(`${GITHUB_URL}/${APS_SLUG}/${urlParts[1]}`);
+        case 3:
+          return redirect(
+            `${GITHUB_URL}/${APS_SLUG}/${urlParts[1]}/commit/${urlParts[2]}`
+          );
+        case 4:
+          return redirect(
+            `${GITHUB_URL}/${APS_SLUG}/${urlParts[1]}/issues/${urlParts[3]}`
+          );
+      }
+    default:
+      return context.next();
+  }
+};
+
+async function redirect(url: string): Promise<Response> {
+  return Response.redirect(url, 301);
+}