Add Twitter proxy verification

src/serviceproviders/twitter.js

@@ -16,10 +16,14 @@ limitations under the License.
 const bent = require('bent')
 const req = bent('GET')
 const serviceproviders = require('../serviceproviders')
+const utils = require('../utils')
 const reURI = /^https:\/\/twitter\.com\/(.*)\/status\/([0-9]*)(?:\?.*)?/
 
 const customRequestHandler = async (spData, opts) => {
   const match = spData.proof.uri.match(reURI)
+
+  // Attempt direct verification if policy allows it
+  if (opts.proxyPolicy !== 'always') {
     if ('twitterBearerToken' in opts && opts.twitterBearerToken) {
       const res = await req(`https://api.twitter.com/1.1/statuses/show.json?id=${match[2]}`, null, {
         Accept: 'application/json',
@@ -36,6 +40,26 @@ const customRequestHandler = async (spData, opts) => {
     }
   }
 
+  // Attempt proxy verification if policy allows it
+  if (opts.proxyPolicy !== 'never' && spData.proof.fetch) {
+    return req(utils.generateProxyURL('twitter', match[2], opts), null, {
+      Accept: 'application/json',
+    })
+    .then(async (res) => {
+      return await res.json()
+    })
+    .then((res) => {
+      return res.data.text
+    })
+    .catch((e) => {
+      reject(e)
+    })
+  }
+
+  // No verification
+  return null
+}
+
 const processURI = (uri, opts) => {
   if (!opts) {
     opts = {}
@@ -54,8 +78,8 @@ const processURI = (uri, opts) => {
     },
     proof: {
       uri: uri,
-      fetch: null,
+      fetch: utils.generateProxyURL('twitter', match[2], opts),
-      useProxy: true,
+      useProxy: false,
       format: 'text',
     },
     claim: {