Add more users filters

Closes #9 (closed)

src/api/__mocks__/users.js

 const users = [
-  { deactivated: false, id: '2', nickname: 'allis', local: true, roles: { admin: true, moderator: false }, tags: [] },
-  { deactivated: false, id: '10', nickname: 'bob', local: false, roles: { admin: false, moderator: true }, tags: ['sandbox'] },
-  { deactivated: true, id: 'abc', nickname: 'john', local: true, roles: { admin: false, moderator: false }, tags: ['strip_media'] }
+  { active: true, deactivated: false, id: '2', nickname: 'allis', local: true, external: false, roles: { admin: true, moderator: false }, tags: [] },
+  { active: true, deactivated: false, id: '10', nickname: 'bob', local: false, external: true, roles: { admin: false, moderator: true }, tags: ['sandbox'] },
+  { active: false, deactivated: true, id: 'abc', nickname: 'john', local: true, external: false, roles: { admin: false, moderator: false }, tags: ['strip_media'] }
 ]
 
-export async function fetchUsers(showLocalUsersOnly, authHost, token, page = 1) {
-  const filteredUsers = showLocalUsersOnly ? users.filter(user => user.local) : users
+const filterUsers = (str) => {
+  const filters = str.split(',').filter(item => item.length > 0)
+  if (filters.length === 0) {
+    return users
+  }
+  const applyFilters = (acc, filters, users) => {
+    if (filters.length === 0) {
+      return acc
+    }
+    const filteredUsers = users.filter(user => user[filters[0]])
+    const newAcc = [...filteredUsers]
+    return applyFilters(newAcc, filters.slice(1), filteredUsers)
+  }
+  return applyFilters([], filters, users)
+}
+
+export async function fetchUsers(filters, authHost, token, page = 1) {
+  const filteredUsers = filterUsers(filters)
   return Promise.resolve({ data: {
     users: filteredUsers,
     count: filteredUsers.length,
@@ -18,8 +34,8 @@ export async function toggleUserActivation(nickname, authHost, token) {
   return Promise.resolve({ data: { ...response, deactivated: !response.deactivated }})
 }
 
-export async function searchUsers(query, showLocalUsersOnly, authHost, token, page = 1) {
-  const filteredUsers = showLocalUsersOnly ? users.filter(user => user.local) : users
+export async function searchUsers(query, filters, authHost, token, page = 1) {
+  const filteredUsers = filterUsers(filters)
   const response = filteredUsers.filter(user => user.nickname === query)
   return Promise.resolve({ data: {
     users: response,