fix S3 post not passing all fields

bin/deploy.sh

@@ -51,7 +51,7 @@ if [ "$os" == "Darwin" ]; then
     (
         cd lambdas/resize
         rm -rf libs lambda.zip
-        docker run --platform linux/x86_64 -v "$PWD":/var/task "public.ecr.aws/sam/build-python3.9" /bin/sh -c "pip install -r requirements.txt -t libs; exit"
+        docker run --platform linux/x86_64 --rm -v "$PWD":/var/task "public.ecr.aws/sam/build-python3.9" /bin/sh -c "pip install -r requirements.txt -t libs; exit"
         cd libs && zip -r ../lambda.zip . && cd ..
         zip lambda.zip handler.py
         rm -rf libs

lambdas/presign/handler.py

@@ -31,7 +31,10 @@ def handler(event, context):
         raise ValueError("no key given")
 
     # make sure the bucket exists
-    s3.create_bucket(Bucket=bucket)
+    try: 
+        s3.head_bucket(Bucket=bucket)
+    except Exception:
+        s3.create_bucket(Bucket=bucket)
 
     # make sure the object does not exist
     try:

website/app.js

@@ -78,21 +78,23 @@
         let urlToCall = functionUrlPresign + "/" + fileName
         console.log(urlToCall);
 
-        let form = this;
-
         $.ajax({
             url: urlToCall,
             success: function (data) {
                 console.log("got pre-signed POST URL", data);
 
-                // set form fields to make it easier to serialize
                 let fields = data['fields'];
-                $(form).attr("action", data['url']);
-                for (let key in fields) {
-                    $("#" + key).val(fields[key]);
-                }
 
-                let formData = new FormData($("#uploadForm")[0]);
+                let formData = new FormData()
+
+                Object.entries(fields).forEach(([field, value]) => {
+                    formData.append(field, value);
+                });
+
+                // the file <input> element, "file" needs to be the last element of the form
+                const fileElement = document.querySelector("#customFile");
+                formData.append("file", fileElement.files[0]);
+
                 console.log("sending form data", formData);
 
                 $.ajax({