add file handler to write route body data to a file

caracal.js

@@ -18,6 +18,7 @@ const iipHandler = require('./handlers/iipHandler.js');
 const proxyHandler = require('./handlers/proxyHandler.js');
 const permissionHandler = require('./handlers/permssionHandler.js');
 const dataHandlers = require('./handlers/dataHandlers.js');
+const fileHandlers = require('./handlers/fileHandlers.js');
 const sanitizeBody = require('./handlers/sanitizeHandler.js');
 const DataTransformationHandler = require('./handlers/dataTransformationHandler.js');
 
@@ -88,6 +89,7 @@ var HANDLERS = {
   "permissionHandler": permissionHandler,
   "editHandler": auth.editHandler,
   "proxyHandler": proxyHandler,
+  "writeFile": fileHandlers.writeFile,
   "iipHandler": function() {
     return iipHandler;
   },

handlers/fileHandlers.js

@@ -0,0 +1,14 @@
+const fs = require('fs').promises;
+const uuid = require("uuid");
+
+// write a file containing the request body
+function writeFile(path, prefix) {
+  return function(req, res, next) {
+    let fn = prefix + "_" + uuid.v4() + ".json";
+    fs.writeFile(path + fn, req.body).then(()=>next()).catch((e) => next(e));
+  };
+};
+
+fileHandlers = {};
+fileHandlers.writeFile = writeFile;
+module.exports = fileHandlers;

package.json

@@ -32,7 +32,8 @@
     "jsonwebtoken": "^8.5.1",
     "jwks-rsa": "^1.12.3",
     "mongodb": "^3.6.6",
-    "throng": "^5.0.0"
+    "throng": "^5.0.0",
+    "uuid": "^8.3.2"
   },
   "devDependencies": {
     "chai": "^4.3.4",