Create R2 upload generator

functions/api/upload.ts

@@ -0,0 +1,40 @@
+import { AwsClient } from "aws4fetch";
+
+const contentTypes: { [k: string]: string } = {
+  gif: "image/gif",
+  m4v: "video/x-m4v",
+  mkv: "video/x-matroska",
+  mov: "video/mp4",
+  mp4: "video/mp4",
+  webm: "video/webm",
+  wmv: "video/x-ms-wmv",
+};
+
+export default async function (
+  env: Env,
+  path: string,
+  size: number,
+  extension: string,
+) {
+  const aws = new AwsClient({
+    accessKeyId: env.R2_ACCESS_KEY,
+    secretAccessKey: env.R2_SECRET_KEY,
+  });
+
+  return (
+    await aws.sign(
+      `https://car-crushers.${env.R2_ZONE}.r2.cloudflarestorage.com/${path}`,
+      {
+        aws: {
+          allHeaders: true,
+          signQuery: true,
+        },
+        headers: {
+          "content-length": size.toString(),
+          "content-type": contentTypes[extension],
+        },
+        method: "PUT",
+      },
+    )
+  ).url;
+}