done purchases remove, ocr scan, read image

express-server/node_modules/express-fileupload/lib/isEligibleRequest.js

@@ -0,0 +1,44 @@
+const ACCEPTABLE_CONTENT_TYPE = /^(?:multipart\/.+)$/i;
+const UNACCEPTABLE_METHODS = [
+  'GET',
+  'HEAD'
+];
+
+/**
+ * Ensures that the request in question is eligible for file uploads
+ * @param {Object} req Express req object
+ */
+module.exports = function(req) {
+  return hasBody(req) && hasAcceptableMethod(req) && hasAcceptableContentType(req);
+};
+
+/**
+ * Ensures the request is not using a non-compliant multipart method
+ * such as GET or HEAD
+ * @param  {Object}  req Express req object
+ * @return {Boolean}
+ */
+function hasAcceptableMethod(req) {
+  return (UNACCEPTABLE_METHODS.indexOf(req.method) < 0);
+}
+
+/**
+ * Ensures that only multipart requests are processed by express-fileupload
+ * @param  {Object}  req Express req object
+ * @return {Boolean}
+ */
+function hasAcceptableContentType(req) {
+  let str = (req.headers['content-type'] || '').split(';')[0];
+
+  return ACCEPTABLE_CONTENT_TYPE.test(str);
+}
+
+/**
+ * Ensures the request contains a content body
+ * @param  {Object}  req Express req object
+ * @return {Boolean}
+ */
+function hasBody(req) {
+  return ('transfer-encoding' in req.headers) ||
+    ('content-length' in req.headers && req.headers['content-length'] !== '0');
+}