Content, retweets, and sample config

Reposts likely don't have content of their own, so check first for the
presence of content before trying to use it.

Retweets use a [specific API
URL](abraham/twitteroauth#428 (comment))
rather than using the Tweet ID as a parameter.

Add the token endpoint to the sample config file.

config.php.sample

@@ -44,6 +44,9 @@ $config = array(
                      ),
     ),
 
+    # the IndieAuth token endpoint to use
+    'token_endpoint' => 'https://tokens.indieauth.com/token',
+
     # the timezone to use for all times
     'tz' => 'America/New_York',
 

inc/content.php

@@ -208,10 +208,15 @@ function create($request, $photos = []) {
 
     # pull out just the content, so that $properties can be front matter
     # NOTE: content may be in ['content'] or ['content']['html'].
-    if (is_array($properties['content']) && isset($properties['content']['html'])) {
-        $content = $properties['content']['html'];
+    # NOTE 2: there may be NO content!
+    if (isset($properties['content'])) {
+        if (is_array($properties['content']) && isset($properties['content']['html'])) {
+            $content = $properties['content']['html'];
+        } else {
+            $content = $properties['content'];
+        }
     } else {
-        $content = $properties['content'];
+        $content = '';
     }
     # ensure that the properties array doesn't contain 'content'
     unset($properties['content']);

inc/twitter.php

@@ -56,8 +56,8 @@ function syndicate_twitter($config, $properties, $content, $url) {
     # URL of our instance of it.
     if (isset($properties['repost-of'])) {
         $id = get_tweet_id($properties['repost-of']);
-        $tweet = $t->post('statuses/retweet/', ['id' => $id]);
-        if (! $t->getLastHttpCode() == 200) {
+        $tweet = $t->post("statuses/retweet/$id");
+        if ($t->getLastHttpCode() != 200) {
             return false;
         }
         return build_tweet_url($tweet);