From 5c92c8c7d6701c11c96a8a586784b9320b1a782e Mon Sep 17 00:00:00 2001
From: "Daniel J. Summers" <daniel@bitbadger.solutions>
Date: Tue, 9 Apr 2024 21:16:34 -0400
Subject: [PATCH] Retrieve feed, add to database (#4)

---
 src/lib/Data.php    | 34 ++++++++++++++++++++++
 src/lib/Feed.php    | 69 +++++++++++++++++++++++++++++++++++++++++++++
 src/public/feed.php |  1 +
 3 files changed, 104 insertions(+)
 create mode 100644 src/lib/Feed.php

diff --git a/src/lib/Data.php b/src/lib/Data.php
index 2bd5e7a..e8e8b91 100644
--- a/src/lib/Data.php
+++ b/src/lib/Data.php
@@ -96,4 +96,38 @@ class Data {
         $query->bindValue(':password', password_hash($password, PASSWORD_DEFAULT));
         $query->execute();
     }
+
+    /**
+     * Add an RSS feed
+     * @param string $url The URL for the RSS feed
+     * @param string $title The title of the RSS feed
+     * @param string $updatedOn The date/time the RSS feed was last updated (from the XML, not when we checked)
+     * @return int The ID of the added feed
+     */
+    public static function addFeed(string $url, string $title, string $updatedOn): int {
+        $db = self::getConnection();
+        if ($updatedOn) {
+            try {
+                $updated = (new DateTimeImmutable($updatedOn))->format(DateTimeInterface::ATOM);
+            } catch (Exception $ex) {
+                $updated = null;
+            }
+        } else {
+            $updated = null;
+        }
+        $query = $db->prepare('INSERT INTO feed (user_id, url, title, updated_on, checked_on)'
+            . ' VALUES (:user, :url, :title, :updated, :checked)');
+        $query->bindValue(':user', $_REQUEST['FRC_USER_ID']);
+        $query->bindValue(':url', $url);
+        $query->bindValue(':title', $title);
+        $query->bindValue(':updated', $updated);
+        $query->bindValue(':checked', (new DateTimeImmutable())->format(DateTimeInterface::ATOM));
+        $result = $query->execute();
+        if ($result) {
+            $idQuery = $db->prepare('SELECT last_insert_rowid()');
+            $idResult = $idQuery->execute();
+            if ($idResult) return $idResult->fetchArray(SQLITE3_NUM)[0];
+        }
+        return -1;
+    }
 }
diff --git a/src/lib/Feed.php b/src/lib/Feed.php
new file mode 100644
index 0000000..0a1cfd0
--- /dev/null
+++ b/src/lib/Feed.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * Feed retrieval, parsing, and manipulation
+ */
+class Feed {
+
+    /**
+     * Parse a feed into an XML tree
+     * @param string $content The feed's RSS content
+     * @return array|SimpleXMLElement[]|string[] [ 'ok' => feed ] if successful, [ 'error' => message] if not
+     */
+    public static function parseFeed(string $content): array {
+        try {
+            return [ 'ok' => new SimpleXMLElement($content) ];
+        } catch (Exception $ex) {
+            return [ 'error' => $ex->getMessage() ];
+        }
+    }
+
+    /**
+     * Retrieve the feed
+     * @param string $url
+     * @return array|SimpleXMLElement[]|string[] [ 'ok' => feedXml, 'url' => actualUrl ] if successful, [ 'error' => message ] if not
+     */
+    public static function retrieveFeed(string $url): array {
+        $feedReq = curl_init($url);
+        curl_setopt($feedReq, CURLOPT_FOLLOWLOCATION, true);
+        curl_setopt($feedReq, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($feedReq, CURLOPT_CONNECTTIMEOUT, 5);
+        curl_setopt($feedReq, CURLOPT_TIMEOUT,        15);
+
+        $feedContent = curl_exec($feedReq);
+
+        $result = array();
+        $error  = curl_error($feedReq);
+        $code   = curl_getinfo($feedReq, CURLINFO_RESPONSE_CODE);
+        if ($error) {
+            $result['error'] = $error;
+        } else if ($code == 200) {
+            $parsed = self::parseFeed($feedContent);
+            if (array_key_exists('error', $parsed)) {
+                $result['error'] = $parsed['error'];
+            } else {
+                $result['ok']  = $parsed['ok'];
+                $result['url'] = curl_getinfo($feedReq, CURLINFO_EFFECTIVE_URL);
+            }
+        } else {
+            $result['error'] = "HTTP Code $code: $feedContent";
+        }
+
+        curl_close($feedReq);
+        return $result;
+    }
+
+    /**
+     * Add an RSS feed
+     * @param string $url The URL of the RSS feed to add
+     * @return array [ 'ok' => true ] if successful, [ 'error' => message ] if not
+     */
+    public static function add(string $url): array {
+        $feed = self::retrieveFeed($url);
+        if (array_key_exists('error', $feed)) return $feed;
+
+        $channel = $feed['ok']->channel;
+        $feedId = Data::addFeed($feed['url'], (string) $channel->title, (string) $channel->lastBuildDate);
+
+        return [ 'ok' => true ];
+    }
+}
diff --git a/src/public/feed.php b/src/public/feed.php
index ef1d0f4..59b4014 100644
--- a/src/public/feed.php
+++ b/src/public/feed.php
@@ -11,6 +11,7 @@ Security::verifyUser();
 
 if ($_SERVER['REQUEST_METHOD'] == 'POST') {
     // TODO: get feed, add if new, reject if existing but not owned by this user, update otherwise
+    $result = Feed::add($_POST['url']);
     $feed = [ 'id' => $_POST['id'], 'url' => $_POST['url'] ];
     $title = 'TODO';
 } else {