Add more metadata for corresponding files

README.md

@@ -18,7 +18,9 @@ This nodejs module will parse the multipart-form containing files and fields fro
             content: <Buffer 25 50 6f 62 ... >,
             contentType: 'application/pdf',
             encoding: '7bit',
-            fieldname: 'uploadFile1'
+            fieldname: 'uploadFile1',
+            size: 26000,
+            checksum: "387d3143b0baa6beb292eda4f81b2d33e55c6744"
         }
     ],
     field1: 'VALUE1',
@@ -39,6 +41,9 @@ Please make sure to enable the "Use Lambda Proxy integration" in API Gateway met
 
 If decided not to enable it for some reason, make sure to pass the required Lambda event parameters in Integration Request -> Mapping Templates section, such as body, headers and isBase64Encoded flag.
 
+The `size` of every file is in **bytes**.
+The `checksum` of every file is calculated using **SHA1** hashing algorithm.
+
 Sample Lambda and API Gateway implementation with Cloudformation can be found in [here](http://francismeynard.github.io/aws-upload-document-service).
 
 ## Test

index.d.ts

@@ -9,6 +9,8 @@ declare module "lambda-multipart-parser" {
         contentType: string
         encoding: string
         fieldname: string
+        size: number
+        checksum: string
     }
 
     type MultipartRequest = { files: MultipartFile[] } & Record<string, string>

index.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const Busboy = require('busboy');
+const Crypto = require('crypto');
 
 /*
  * This module will parse the multipart-form containing files and fields from the lambda event object.
@@ -13,7 +14,9 @@ const Busboy = require('busboy');
                 content: <Buffer 25 50 6f 62 ... >,
                 contentType: 'application/pdf',
                 encoding: '7bit',
-                fieldname: 'uploadFile1'
+                fieldname: 'uploadFile1',
+                size: 26000,
+                checksum: "387d3143b0baa6beb292eda4f81b2d33e55c6744"
             }
         ],
         field1: 'VALUE1',
@@ -43,6 +46,8 @@ const parse = (event) => new Promise((resolve, reject) => {
                 uploadFile.contentType = mimetype;
                 uploadFile.encoding = encoding;
                 uploadFile.fieldname = fieldname;
+                uploadFile.size = Buffer.byteLength(uploadFile.content);
+                uploadFile.checksum = Crypto.createHash('sha1').update(uploadFile.content, "utf-8").digest('hex');
                 result.files.push(uploadFile);
             }
         });

package.json

@@ -24,7 +24,8 @@
         "multipart/formdata"
     ],
     "dependencies": {
-        "busboy": "^0.3.0"
+        "busboy": "^0.3.0",
+        "crypto": "^1.0.1"
     },
     "devDependencies": {
         "chai": "^3.5.0",

test/MultipartParserTest.js

@@ -45,6 +45,8 @@ describe('MultipartParser', () => {
             assert.equal(file.contentType, "text/plain");
             assert.equal(file.encoding, "7bit");
             assert.equal(file.fieldname, "uploadFile1");
+            assert.equal(file.size, 12);
+            assert.equal(file.checksum, "2ef7bde608ce5404e97d5f042f95f89f1c232871");
         });
 
         it('should parse the multipart form-data successfully given base64 encoded form data', async () => {
@@ -72,6 +74,8 @@ describe('MultipartParser', () => {
             assert.equal(file.contentType, "text/plain");
             assert.equal(file.encoding, "7bit");
             assert.equal(file.fieldname, "uploadFile1");
+            assert.equal(file.size, 12);
+            assert.equal(file.checksum, "2ef7bde608ce5404e97d5f042f95f89f1c232871");
         });
 
         it('should parse the multipart form-data successfully given utf8 encoded form data', async () => {