Fix serverless signing with body

Signed-off-by: Harsha Vamsi Kalluri <harshavamsi096@gmail.com>

lib/aws/AwsSigv4Signer.js

@@ -12,6 +12,7 @@
 const Connection = require('../Connection');
 const Transport = require('../Transport');
 const aws4 = require('aws4');
+const crypto = require('crypto');
 const AwsSigv4SignerError = require('./errors');
 
 const getAwsSDKCredentialsProvider = async () => {
@@ -77,13 +78,23 @@ function AwsSigv4Signer(opts = {}) {
     request.region = opts.region;
     request.headers = request.headers || {};
     request.headers['host'] = request.hostname;
+    request.headers['X-Amz-Content-Sha256'] = hash(request.body || '', 'hex');
+    request.extraHeadersToIgnore = {
+      'content-length': true,
+    };
     return aws4.sign(request, credentialsState.credentials);
   }
 
+  function hash(string, encoding) {
+    return crypto.createHash('sha256').update(string, 'utf8').digest(encoding);
+  }
+
   class AwsSigv4SignerConnection extends Connection {
     buildRequestObject(params) {
       const request = super.buildRequestObject(params);
-      return buildSignedRequestObject(request);
+      let req = buildSignedRequestObject(request);
+      console.log(req);
+      return req;
     }
   }
 

lib/aws/index.d.ts

@@ -19,6 +19,7 @@ import { OpenSearchClientError } from '../errors';
 interface AwsSigv4SignerOptions {
   getCredentials?: () => Promise<Credentials>;
   region: string;
+  service: string;
 }
 
 interface AwsSigv4SignerResponse {

package.json

@@ -91,7 +91,7 @@
     "xmlbuilder2": "^3.0.2"
   },
   "dependencies": {
-    "aws4": "^1.11.0",
+    "aws4": "^1.12.0",
     "debug": "^4.3.1",
     "hpagent": "^0.1.1",
     "ms": "^2.1.3",