Wire up file upload form

src/services/uploadFile.js

@@ -0,0 +1,29 @@
+import axios from 'axios';
+
+const UPLOAD_ENDPOINT = 'http://localhost:8080/api/upload';
+
+export const getCancelToken = () => {
+  const token = axios.CancelToken;
+  return token.source();
+}
+
+export const uploadFile = (file, onProgress, cancelToken) => {
+  const form = new FormData();
+  let options = {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'multipart/form-data',
+    },
+    cancelToken,
+  };
+  if (onProgress) {
+    options = { 
+      ...options,
+      onUploadProgress: (event) => {
+        onProgress(Math.floor((event.loaded / event.total) * 100));
+      }
+    }
+  } 
+  form.append('file', file);
+  return axios.post(UPLOAD_ENDPOINT, form, options);
+};