First attempt at gathering district boundaries

Toward openva/richmondsunlight.com#349.

cron/district_boundaries.php

@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * Get every current district
+ */
+$sql = $dbh->query('SELECT
+                        id,
+                        chamber,
+                        number
+                    FROM
+                        districts
+                    WHERE
+                        date_ended IS NULL');
+
+/*
+ * Prepare our boundary-insertion SQL statement
+ */
+$update_stmt = $dbh->prepare('UPDATE districts
+                                SET boundaries = :boundaries
+                                WHERE id = :district_id');
+
+/*
+ * Iterate through districts
+ */
+while ($district = $stmt->fetch())
+{
+
+    if ($district['chamber'] == 'house')
+    {
+        $c = 'l';
+    }
+    else
+    {
+        $c = 'u';
+    }
+
+    $url = 'https://data.openstates.org/boundaries/2018/ocd-division/country:us/state:va/sld' . $c . ':' . $district['number'] . '.json';
+    $json = get_content($url);
+
+    /*
+    * If this is valid JSON.
+    */
+    if ($json != FALSE)
+    {
+
+        $district_data = json_decode($json);
+
+        /*
+        * Swap lat/lon to X/Y.
+        */
+        foreach ($district_data->shape->coordinates[0][0] as &$pair)
+        {
+            $tmp[0] = $pair[1];
+            $tmp[1] = $pair[0];
+            $pair = $tmp;
+        }
+    }
+
+    /*
+     * Save the boundary data.
+     */
+    $update_stmt->bindParam(':boundaries', $district_data);
+    $update_stmt->bindParam(':district_id', $district['id']);
+    $result = $update_stmt->execute();
+
+}