add initial support for REST

lib/rest/calls.js

@@ -0,0 +1,30 @@
+const assert = require('assert');
+
+class Calls {
+  constructor(accountSid, apiKey, opts) {
+    this.accountSid = accountSid;
+    this.apiKey = apiKey;
+
+    ['post', 'put', 'get', 'del'].forEach((m) => this[m] = opts[m]);
+  }
+
+  async update(callSid, opts) {
+    const {call_hook, call_status, listen_status, mute_status, whisper} = opts;
+
+    assert.ok(call_hook || call_status || listen_status || mute_status || whisper,
+      `calls.update: invalid request ${JSON.stringify(opts)}`);
+
+    if (call_status) assert.ok(['completed', 'no-answer'].includes(call_status),
+      `invalid call_status: ${call_status}, must be 'completed' or 'no-answer'`);
+
+    if (mute_status) assert.ok(['mute', 'unmute'].includes(mute_status),
+      `invalid mute_status: ${mute_status}, must be 'mute' or 'unmute'`);
+
+    if (whisper) assert.ok(whisper.verb,
+      `invalid whisper: ${JSON.stringify(whisper)}, must  be a 'play' or 'say' verb`);
+
+    await this.post(`Accounts/${this.accountSid}/Calls/${callSid}`, opts);
+  }
+}
+
+module.exports = Calls;