Configurable headers for all elasticsearch requests

config/kibana.yml

@@ -65,6 +65,10 @@
 # headers, set this value to [] (an empty list).
 # elasticsearch.requestHeadersWhitelist: [ authorization ]
 
+# Header names and values that are sent to Elasticsearch. Any custom headers cannot be overwritten
+# by client-side headers, regardless of the elasticsearch.requestHeadersWhitelist configuration.
+# elasticsearch.customHeaders: {}
+
 # Time in milliseconds for Elasticsearch to wait for responses from shards. Set to 0 to disable.
 # elasticsearch.shardTimeout: 0
 

docs/kibana-yml.asciidoc

@@ -38,6 +38,8 @@ wait for Elasticsearch to respond to pings.
 Elasticsearch. This value must be a positive integer.
 `elasticsearch.requestHeadersWhitelist:`:: *Default: `[ 'authorization' ]`* List of Kibana client-side headers to send to Elasticsearch.
 To send *no* client-side headers, set this value to [] (an empty list).
+`elasticsearch.customHeaders:`:: *Default: `{}`* Header names and values to send to Elasticsearch. Any custom headers
+cannot be overwritten by client-side headers, regardless of the `elasticsearch.requestHeadersWhitelist` configuration.
 `elasticsearch.shardTimeout:`:: *Default: 0* Time in milliseconds for Elasticsearch to wait for responses from shards. Set
 to 0 to disable.
 `elasticsearch.startupTimeout:`:: *Default: 5000* Time in milliseconds to wait for Elasticsearch at Kibana startup before

src/core_plugins/elasticsearch/index.js

@@ -23,6 +23,7 @@ module.exports = function ({ Plugin }) {
         shardTimeout: number().default(0),
         requestTimeout: number().default(30000),
         requestHeadersWhitelist: array().items().single().default(DEFAULT_REQUEST_HEADERS),
+        customHeaders: object().default({}),
         pingTimeout: number().default(ref('requestTimeout')),
         startupTimeout: number().default(5000),
         ssl: object({

src/core_plugins/elasticsearch/lib/__tests__/map_uri.js

@@ -22,15 +22,35 @@ describe('plugins/elasticsearch', function () {
       };
     });
 
-    it('only sends the whitelisted request headers', function () {
+    it('sends custom headers if set', function () {
+      const get = sinon.stub();
+      get.withArgs('elasticsearch.requestHeadersWhitelist').returns([]);
+      get.withArgs('elasticsearch.customHeaders').returns({ foo: 'bar' });
+      const server = { config: () => ({ get }) };
 
-      const get = sinon.stub()
-      .withArgs('elasticsearch.url').returns('http://foobar:9200')
-      .withArgs('elasticsearch.requestHeadersWhitelist').returns(['x-my-custom-HEADER', 'Authorization']);
-      const config = function () { return { get: get }; };
-      const server = {
-        config: config
-      };
+      mapUri(server)(request, function (err, upstreamUri, upstreamHeaders) {
+        expect(err).to.be(null);
+        expect(upstreamHeaders).to.have.property('foo', 'bar');
+      });
+    });
+
+    it('sends configured custom headers even if the same named header exists in request', function () {
+      const get = sinon.stub();
+      get.withArgs('elasticsearch.requestHeadersWhitelist').returns(['x-my-custom-header']);
+      get.withArgs('elasticsearch.customHeaders').returns({'x-my-custom-header': 'asconfigured'});
+      const server = { config: () => ({ get }) };
+
+      mapUri(server)(request, function (err, upstreamUri, upstreamHeaders) {
+        expect(err).to.be(null);
+        expect(upstreamHeaders).to.have.property('x-my-custom-header', 'asconfigured');
+      });
+    });
+
+    it('only proxies the whitelisted request headers', function () {
+      const get = sinon.stub();
+      get.withArgs('elasticsearch.requestHeadersWhitelist').returns(['x-my-custom-HEADER', 'Authorization']);
+      get.withArgs('elasticsearch.customHeaders').returns({});
+      const server = { config: () => ({ get }) };
 
       mapUri(server)(request, function (err, upstreamUri, upstreamHeaders) {
         expect(err).to.be(null);
@@ -40,31 +60,23 @@ describe('plugins/elasticsearch', function () {
       });
     });
 
-    it('sends no headers if whitelist is set to []', function () {
-
-      const get = sinon.stub()
-      .withArgs('elasticsearch.url').returns('http://foobar:9200')
-      .withArgs('elasticsearch.requestHeadersWhitelist').returns([]);
-      const config = function () { return { get: get }; };
-      const server = {
-        config: config
-      };
+    it('proxies no headers if whitelist is set to []', function () {
+      const get = sinon.stub();
+      get.withArgs('elasticsearch.requestHeadersWhitelist').returns([]);
+      get.withArgs('elasticsearch.customHeaders').returns({});
+      const server = { config: () => ({ get }) };
 
       mapUri(server)(request, function (err, upstreamUri, upstreamHeaders) {
         expect(err).to.be(null);
         expect(Object.keys(upstreamHeaders).length).to.be(0);
       });
     });
 
-    it('sends no headers if whitelist is set to no value', function () {
-
-      const get = sinon.stub()
-      .withArgs('elasticsearch.url').returns('http://foobar:9200')
-      .withArgs('elasticsearch.requestHeadersWhitelist').returns([ null ]); // This is how Joi returns it
-      const config = function () { return { get: get }; };
-      const server = {
-        config: config
-      };
+    it('proxies no headers if whitelist is set to no value', function () {
+      const get = sinon.stub();
+      get.withArgs('elasticsearch.requestHeadersWhitelist').returns([ null ]); // This is how Joi returns it
+      get.withArgs('elasticsearch.customHeaders').returns({});
+      const server = { config: () => ({ get }) };
 
       mapUri(server)(request, function (err, upstreamUri, upstreamHeaders) {
         expect(err).to.be(null);

src/core_plugins/elasticsearch/lib/__tests__/set_headers.js

@@ -0,0 +1,39 @@
+import expect from 'expect.js';
+import sinon from 'sinon';
+import setHeaders from '../set_headers';
+
+describe('plugins/elasticsearch', function () {
+  describe('lib/set_headers', function () {
+    it('throws if not given an object as the first argument', function () {
+      const fn = () => setHeaders(null, {});
+      expect(fn).to.throwError();
+    });
+
+    it('throws if not given an object as the second argument', function () {
+      const fn = () => setHeaders({}, null);
+      expect(fn).to.throwError();
+    });
+
+    it('returns a new object', function () {
+      const originalHeaders = {};
+      const newHeaders = {};
+      const returnedHeaders = setHeaders(originalHeaders, newHeaders);
+      expect(returnedHeaders).not.to.be(originalHeaders);
+      expect(returnedHeaders).not.to.be(newHeaders);
+    });
+
+    it('returns object with newHeaders merged with originalHeaders', function () {
+      const originalHeaders = { foo: 'bar' };
+      const newHeaders = { one: 'two' };
+      const returnedHeaders = setHeaders(originalHeaders, newHeaders);
+      expect(returnedHeaders).to.eql({ foo: 'bar', one: 'two' });
+    });
+
+    it('returns object where newHeaders takes precedence for any matching keys', function () {
+      const originalHeaders = { foo: 'bar' };
+      const newHeaders = { one: 'two', foo: 'notbar' };
+      const returnedHeaders = setHeaders(originalHeaders, newHeaders);
+      expect(returnedHeaders).to.eql({ foo: 'notbar', one: 'two' });
+    });
+  });
+});

src/core_plugins/elasticsearch/lib/expose_client.js

@@ -55,9 +55,19 @@ module.exports = function (server) {
       ssl.ca = options.ca.map(readFile);
     }
 
+    const host = {
+      host: uri.hostname,
+      port: uri.port,
+      protocol: uri.protocol,
+      path: uri.pathname,
+      auth: uri.auth,
+      query: uri.query,
+      headers: config.get('elasticsearch.customHeaders')
+    };
+
     return new elasticsearch.Client({
-      host: url.format(uri),
-      ssl: ssl,
+      host,
+      ssl,
       plugins: options.plugins,
       apiVersion: options.apiVersion,
       keepAlive: options.keepAlive,

src/core_plugins/elasticsearch/lib/map_uri.js

@@ -1,8 +1,9 @@
 import querystring from 'querystring';
 import { resolve } from 'url';
 import filterHeaders from './filter_headers';
+import setHeaders from './set_headers';
 
-module.exports = function mapUri(server, prefix) {
+export default function mapUri(server, prefix) {
 
   const config = server.config();
   return function (request, done) {
@@ -14,7 +15,8 @@ module.exports = function mapUri(server, prefix) {
     }
     const query = querystring.stringify(request.query);
     if (query) url += '?' + query;
-    const filteredHeaders = filterHeaders(request.headers, server.config().get('elasticsearch.requestHeadersWhitelist'));
-    done(null, url, filteredHeaders);
+    const filteredHeaders = filterHeaders(request.headers, config.get('elasticsearch.requestHeadersWhitelist'));
+    const customHeaders = setHeaders(filteredHeaders, config.get('elasticsearch.customHeaders'));
+    done(null, url, customHeaders);
   };
 };

src/core_plugins/elasticsearch/lib/set_headers.js

@@ -0,0 +1,15 @@
+import { isPlainObject } from 'lodash';
+
+export default function setHeaders(originalHeaders, newHeaders) {
+  if (!isPlainObject(originalHeaders)) {
+    throw new Error(`Expected originalHeaders to be an object, but ${typeof originalHeaders} given`);
+  }
+  if (!isPlainObject(newHeaders)) {
+    throw new Error(`Expected newHeaders to be an object, but ${typeof newHeaders} given`);
+  }
+
+  return {
+    ...originalHeaders,
+    ...newHeaders
+  };
+}