validate response of federation APIs (#2408)

* validate json responses

* update deps

* tmp disable header check

* log all the webfinger fails

refactor and filter more malformed requests

* don't set incorrect serverURL strings

* test failing through admin api

* fix server url in fedi tests

* check response.text

* validate json/xml response of all apis

test Content-Type of api response and cleanup

* improve logs

* fix rebase

* cleanup json parser in api tests

* mark the api tests performed by admin

* Separate check for reading and format of serverURL

* test /federation/user/ with wrong username in ci

test/automated/api/configmanagement.test.js

@@ -3,6 +3,7 @@ var request = require('supertest');
 const Random = require('crypto-random');
 
 const sendAdminRequest = require('./lib/admin').sendAdminRequest;
+const failAdminRequest = require('./lib/admin').failAdminRequest;
 const getAdminResponse = require('./lib/admin').getAdminResponse;
 
 request = request('http://127.0.0.1:8080');
@@ -245,6 +246,10 @@ test('set forbidden usernames', async (done) => {
 });
 
 test('set server url', async (done) => {
+	const resBadURL = await failAdminRequest(
+		'config/serverurl',
+		'not.valid.url'
+	);
 	const res = await sendAdminRequest(
 		'config/serverurl',
 		newYPConfig.instanceUrl