Add getRolePermissions method

Author: suufi

lib/group/getRolePermissions.js

@@ -0,0 +1,45 @@
+// Includes
+var http = require('../util/http.js').func
+var getGeneralToken = require('../util/getGeneralToken.js').func
+
+exports.required = ['group', 'roleId']
+exports.optional = ['jar']
+
+function getRolePermissions (group, roleId, jar, xcsrf) {
+  return new Promise((resolve, reject) => {
+    var httpOpt = {
+      url: `https://groups.roblox.com/v1/groups/${group}/roles/${roleId}/permissions`,
+      options: {
+        method: 'GET',
+        resolveWithFullResponse: true,
+        jar: jar,
+        headers: {
+          'X-CSRF-TOKEN': xcsrf
+        }
+      }
+    }
+
+    return http(httpOpt)
+      .then(function (res) {
+        const responseData = JSON.parse(res.body)
+        if (res.statusCode !== 200) {
+          let error = 'An unknown error has occurred.'
+          if (responseData && responseData.errors) {
+            error = responseData.errors.map((e) => e.message).join('\n')
+          }
+          reject(new Error(error))
+        } else {
+          resolve(responseData)
+        }
+      })
+  })
+}
+
+// Define
+exports.func = function (args) {
+  const jar = args.jar
+  return getGeneralToken({ jar: jar })
+    .then(function (xcsrf) {
+      return getRolePermissions(args.group, args.roleId, jar, xcsrf)
+    })
+}