function to get a signedUrl to upload file to s3

lib/resources/s3-bucket-uploadurl.ts

@@ -0,0 +1,35 @@
+import { APIGatewayProxyHandler, APIGatewayProxyResult } from 'aws-lambda';
+import { S3 } from "aws-sdk";
+import * as uuid from "uuid";
+
+export function getUploadURL() {
+    const s3 = new S3();
+    const bucket = "ishihara-app-uploads-stage";
+    const key = uuid.v4();
+
+    const params = {
+        Expires: 60,
+        Bucket: bucket,
+        Conditions: [["content-length-range", 100, 10000000]], // 100Byte - 10MB
+        ContentType: 'image/jpeg',
+        // ACL: 'public-read'
+    };
+
+    try {
+        const uploadURL = s3.getSignedUrl('putObject', params);
+        console.log
+        return {
+            statusCode: 200,
+            body: JSON.stringify({
+                uploadURL: uploadURL,
+                photoFilename: `${key}.jpg`
+            })
+        };
+
+    } catch (err) {
+        console.log(err);
+        const message = `Error adding object ${key} to bucket ${bucket}. Make sure your bucket is in the same region as this function.`;
+        console.log(message);
+        throw new Error(message);
+    }
+};