Add polls (#10111)

* Add polls

Fix #1629

* Add tests

* Fixes

* Change API for creating polls

* Use name instead of content for votes

* Remove poll validation for remote polls

* Add polls to public pages

* When updating the poll, update options just in case they were changed

* Fix public pages showing both poll and other media

app/javascript/mastodon/actions/polls.js

@@ -0,0 +1,53 @@
+import api from '../api';
+
+export const POLL_VOTE_REQUEST = 'POLL_VOTE_REQUEST';
+export const POLL_VOTE_SUCCESS = 'POLL_VOTE_SUCCESS';
+export const POLL_VOTE_FAIL    = 'POLL_VOTE_FAIL';
+
+export const POLL_FETCH_REQUEST = 'POLL_FETCH_REQUEST';
+export const POLL_FETCH_SUCCESS = 'POLL_FETCH_SUCCESS';
+export const POLL_FETCH_FAIL    = 'POLL_FETCH_FAIL';
+
+export const vote = (pollId, choices) => (dispatch, getState) => {
+  dispatch(voteRequest());
+
+  api(getState).post(`/api/v1/polls/${pollId}/votes`, { choices })
+    .then(({ data }) => dispatch(voteSuccess(data)))
+    .catch(err => dispatch(voteFail(err)));
+};
+
+export const fetchPoll = pollId => (dispatch, getState) => {
+  dispatch(fetchPollRequest());
+
+  api(getState).get(`/api/v1/polls/${pollId}`)
+    .then(({ data }) => dispatch(fetchPollSuccess(data)))
+    .catch(err => dispatch(fetchPollFail(err)));
+};
+
+export const voteRequest = () => ({
+  type: POLL_VOTE_REQUEST,
+});
+
+export const voteSuccess = poll => ({
+  type: POLL_VOTE_SUCCESS,
+  poll,
+});
+
+export const voteFail = error => ({
+  type: POLL_VOTE_FAIL,
+  error,
+});
+
+export const fetchPollRequest = () => ({
+  type: POLL_FETCH_REQUEST,
+});
+
+export const fetchPollSuccess = poll => ({
+  type: POLL_FETCH_SUCCESS,
+  poll,
+});
+
+export const fetchPollFail = error => ({
+  type: POLL_FETCH_FAIL,
+  error,
+});