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Alpha 1

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Reviewed-on: #8
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Daniel J. Summers 2024-04-15 22:48:09 +00:00
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.idea
src/data/*.db

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# Installation
## All Environments (FrankenPHP)
The easiest way to get up and running quickly is by using [FrankenPHP](https://frankenphp.dev), a version of [Caddy](https://caddyserver.com) that runs PHP in its process. There is a `Caddyfile` in the `/src` directory which will configure the site to run with FrankenPHP.
For Linux / Mac users:
- Follow [their instructions](https://frankenphp.dev/docs/#standalone-binary) for downloading a binary for your system
- Rename that binary to `frankenphp` and make it executable (`chmod +x ./frankenphp`)
- Move that binary to `/usr/local/bin`
For Windows users, the steps are the same; however, the binary should be named `frankenphp.exe` and be placed somewhere within your system's `PATH`.
Once those steps are complete, from the `/src` directory, run `frankenphp run`.
_(More environments will be detailed as part of a later release; an nginx reverse proxy via FastCGI is another common way to run PHP applications.)_
## PHP Requirements
This is written to target PHP 8.3, and requires the `curl`, `DOM`, and `SQLite3` modules. _(FrankenPHP contains these modules as part of its build.)_
# Setup and Configuration
## Site Address
The default `Caddyfile` will run the site at `http://localhost:8205`. To have the process respond to other devices on your network, you can add the server name to that to line 5 (ex. `http://localhost:8205, http://server:8205`); you can also change the port on which it listens. (Note that if `http` is not specified, Caddy will attempt to obtain and install a server certificate. This may be what you want, but that also could be a source of startup errors.)
## Feed Reader Central Behavior
Within the `/src` directory, there is a file named `user-config.php`. This file is the place for customizations and configuration of the instance's behavior.
### Security Model
There ~~are~~ will be three supported security models, designed around different ways the software may be deployed.
- `Securty::SINGLE_USER` assumes that all connections to the instance are the same person. There is no password required, and no username or e-mail address will be displayed for that user. This is a good setup for a single user on a home intranet. **DO NOT PUT AN INSTANCE WITH THIS CONFIGURATION ON THE PUBLIC INTERNET!** If you do, you deserve what you get.
- `Security::SINGLE_USER_WITH_PASSWORD` _(not yet implemented)_ will be the same as the above, but will require a password. This setup is ideal for intranets where the user does not want any other users ending up marking their feeds as read just by browsing them.
- `Security::MULTI_USER` _(not yet implemented)_ will require a known e-mail address and password be provided to establish the identity of each user. This will be the most appropriate setup for an Internet-facing instance, even if there is only one user.
### Database Name
Data is stored under the `/src/data` directory, and the default database name is `frc.db`. If users want to change that path or file name, the path provided should be relative to `/src/data`, not just `/src`.
### Date/Time Format
The default format for dates and times look like "May 28, 2023 at 3:15pm". Changing the string there will alter the display on the main page and when reading an item. Any [supported PHP date or time token](https://www.php.net/manual/en/datetime.format.php) is supported.

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# feed-reader-central
# Feed Reader Central
A centralized, lightweight feed reader with simple self-hosting
Feed Reader Central is a lightweight feed reader with simple self-hosting. The self-hosted instance serves as a place where feeds can be read and referenced from different devices.
It is written in vanilla PHP, and uses a SQLite database to keep track of items.
See [INSTALLING.md](./INSTALLING.md) for setup and configuration instructions.

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{
frankenphp
order php_server before file_server
}
http://localhost:8205 {
root ./public
try_files {path} {path}.php
php_server
}

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<?php
/**
* A centralized place for data access for the application
*/
class Data {
/**
* Obtain a new connection to the database
* @return SQLite3 A new connection to the database
*/
public static function getConnection(): SQLite3 {
$db = new SQLite3('../data/' . DATABASE_NAME);
$db->exec('PRAGMA foreign_keys = ON;');
return $db;
}
/**
* Make sure the expected tables exist
*/
public static function ensureDb(): void {
$db = self::getConnection();
$tables = array();
$tableQuery = $db->query("SELECT name FROM sqlite_master WHERE type = 'table'");
while ($table = $tableQuery->fetchArray(SQLITE3_NUM)) $tables[] = $table[0];
if (!in_array('frc_user', $tables)) {
$query = <<<'SQL'
CREATE TABLE frc_user (
id INTEGER NOT NULL PRIMARY KEY,
email TEXT NOT NULL,
password TEXT NOT NULL)
SQL;
$db->exec($query);
$db->exec('CREATE INDEX idx_user_email ON frc_user (email)');
}
if (!in_array('feed', $tables)) {
$query = <<<'SQL'
CREATE TABLE feed (
id INTEGER NOT NULL PRIMARY KEY,
user_id INTEGER NOT NULL,
url TEXT NOT NULL,
title TEXT,
updated_on TEXT,
checked_on TEXT,
FOREIGN KEY (user_id) REFERENCES frc_user (id))
SQL;
$db->exec($query);
}
if (!in_array('item', $tables)) {
$query = <<<'SQL'
CREATE TABLE item (
id INTEGER NOT NULL PRIMARY KEY,
feed_id INTEGER NOT NULL,
title TEXT NOT NULL,
item_guid TEXT NOT NULL,
item_link TEXT NOT NULL,
published_on TEXT NOT NULL,
updated_on TEXT,
content TEXT NOT NULL,
is_read BOOLEAN NOT NULL DEFAULT 0,
is_bookmarked BOOLEAN NOT NULL DEFAULT 0,
FOREIGN KEY (feed_id) REFERENCES feed (id))
SQL;
$db->exec($query);
}
$db->close();
}
/**
* Find a user by their ID
*
* @param string $email The e-mail address of the user to retrieve
* @return array|null The user information, or null if the user is not found
*/
public static function findUserByEmail(string $email): ?array {
$db = self::getConnection();
try {
$query = $db->prepare('SELECT * FROM frc_user WHERE email = :email');
$query->bindValue(':email', $email);
$result = $query->execute();
if ($result) {
$user = $result->fetchArray(SQLITE3_ASSOC);
if ($user) return $user;
return null;
}
return null;
} finally {
$db->close();
}
}
/**
* Add a user
*
* @param string $email The e-mail address for the user
* @param string $password The user's password
*/
public static function addUser(string $email, string $password): void {
$db = self::getConnection();
try {
$query = $db->prepare('INSERT INTO frc_user (email, password) VALUES (:email, :password)');
$query->bindValue(':email', $email);
$query->bindValue(':password', password_hash($password, PASSWORD_DEFAULT));
$query->execute();
} finally {
$db->close();
}
}
/**
* Parse/format a date/time from a string
*
* @param ?string $value The date/time to be parsed and formatted
* @return string|null The date/time in `DateTimeInterface::ATOM` format, or `null` if the input cannot be parsed
*/
public static function formatDate(?string $value): ?string {
try {
return $value ? (new DateTimeImmutable($value))->format(DateTimeInterface::ATOM) : null;
} catch (Exception) {
return null;
}
}
/**
* Retrieve a feed by its ID for the current user
*
* @param int $feedId The ID of the feed to retrieve
* @param ?SQLite3 $dbConn A database connection to use (optional; will use standalone if not provided)
* @return array|bool The data for the feed if found, false if not found
*/
public static function retrieveFeedById(int $feedId, ?SQLite3 $dbConn = null): array|bool {
$db = $dbConn ?? self::getConnection();
try {
$query = $db->prepare('SELECT * FROM feed WHERE id = :id AND user_id = :user');
$query->bindValue(':id', $feedId);
$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
$result = $query->execute();
return $result ? $result->fetchArray(SQLITE3_ASSOC) : false;
} finally {
if (is_null($dbConn)) $db->close();
}
}
}

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<?php
/**
* Feed retrieval, parsing, and manipulation
*/
class Feed {
/** @var string The XML namespace for Atom feeds */
public const string ATOM_NS = 'http://www.w3.org/2005/Atom';
/** @var string The XML namespace for the `<content:encoded>` tag that allows HTML content in a feed */
public const string CONTENT_NS = 'http://purl.org/rss/1.0/modules/content/';
/**
* When parsing XML into a DOMDocument, errors are presented as warnings; this creates an exception for them
*
* @param int $errno The error level encountered
* @param string $errstr The text of the error encountered
* @return bool False, to delegate to the next error handler in the chain
* @throws DOMException If the error is a warning
*/
private static function xmlParseError(int $errno, string $errstr): bool {
if ($errno == E_WARNING && substr_count($errstr, 'DOMDocument::loadXml()') > 0) {
throw new DOMException($errstr, $errno);
}
return false;
}
/**
* Parse a feed into an XML tree
*
* @param string $content The feed's RSS content
* @return array|DOMDocument[]|string[] ['ok' => feed] if successful, ['error' => message] if not
*/
public static function parseFeed(string $content): array {
set_error_handler(self::xmlParseError(...));
try {
$feed = new DOMDocument();
$feed->loadXML($content);
return ['ok' => $feed];
} catch (DOMException $ex) {
return ['error' => $ex->getMessage()];
} finally {
restore_error_handler();
}
}
/**
* Get the value of a child element by its tag name
*
* @param DOMElement $element The parent element
* @param string $tagName The name of the tag whose value should be obtained
* @return string The value of the element (or "[element] not found" if that element does not exist)
*/
private static function eltValue(DOMElement $element, string $tagName): string {
$tags = $element->getElementsByTagName($tagName);
return $tags->length == 0 ? "$tagName not found" : $tags->item(0)->textContent;
}
/**
* Retrieve the feed
*
* @param string $url
* @return array|DOMDocument[]|string[]|DOMElement[]
* ['ok' => feedXml, 'url' => actualUrl, 'channel' => channel, 'updated' => updatedDate] 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);
$channel = $result['ok']->getElementsByTagName('channel')->item(0);
if ($channel instanceof DOMElement) {
$result['channel'] = $channel;
} else {
return ['error' => "Channel element not found ($channel->nodeType)"];
}
// In Atom feeds, lastBuildDate contains the last time an item in the feed was updated; if that is not
// present, use the pubDate element instead
$updated = self::eltValue($channel, 'lastBuildDate');
if ($updated == 'lastBuildDate not found') {
$updated = self::eltValue($channel, 'pubDate');
if ($updated == 'pubDate not found') $updated = null;
}
$result['updated'] = Data::formatDate($updated);
return $result;
}
} else {
$result['error'] = "Prospective feed URL $url returned HTTP Code $code: $feedContent";
}
curl_close($feedReq);
return $result;
}
/**
* Extract the fields we need to keep from the feed
*
* @param DOMElement $item The item from the feed
* @return array The fields for the item as an associative array
*/
private static function itemFields(DOMElement $item): array {
$itemGuid = self::eltValue($item, 'guid');
$updNodes = $item->getElementsByTagNameNS(self::ATOM_NS, 'updated');
$encNodes = $item->getElementsByTagNameNS(self::CONTENT_NS, 'encoded');
return [
'guid' => $itemGuid == 'guid not found' ? self::eltValue($item, 'link') : $itemGuid,
'title' => self::eltValue($item, 'title'),
'link' => self::eltValue($item, 'link'),
'published' => Data::formatDate(self::eltValue($item, 'pubDate')),
'updated' => Data::formatDate($updNodes->length > 0 ? $updNodes->item(0)->textContent : null),
'content' => $encNodes->length > 0 ? $encNodes->item(0)->textContent
: self::eltValue($item, 'description')
];
}
/**
* Update a feed item
*
* @param int $itemId The ID of the item to be updated
* @param array $item The fields from the updated item
* @param SQLite3 $db A database connection to use for the update
*/
private static function updateItem(int $itemId, array $item, SQLite3 $db): void {
$query = $db->prepare(<<<'SQL'
UPDATE item
SET title = :title,
published_on = :published,
updated_on = :updated,
content = :content,
is_read = 0
WHERE id = :id
SQL);
$query->bindValue(':title', $item['title']);
$query->bindValue(':published', $item['published']);
$query->bindValue(':updated', $item['updated']);
$query->bindValue(':content', $item['content']);
$query->bindValue(':id', $itemId);
$query->execute();
}
/**
* Add a feed item
*
* @param int $feedId The ID of the feed to which the item should be added
* @param array $item The fields for the item
* @param SQLite3 $db A database connection to use for the addition
*/
private static function addItem(int $feedId, array $item, SQLite3 $db): void {
$query = $db->prepare(<<<'SQL'
INSERT INTO item (
feed_id, item_guid, item_link, title, published_on, updated_on, content
) VALUES (
:feed, :guid, :link, :title, :published, :updated, :content
)
SQL);
$query->bindValue(':feed', $feedId);
$query->bindValue(':guid', $item['guid']);
$query->bindValue(':link', $item['link']);
$query->bindValue(':title', $item['title']);
$query->bindValue(':published', $item['published']);
$query->bindValue(':updated', $item['updated']);
$query->bindValue(':content', $item['content']);
$query->execute();
}
/**
* Update a feed's items
*
* @param int $feedId The ID of the feed to which these items belong
* @param DOMElement $channel The RSS feed items
* @return array ['ok' => true] if successful, ['error' => message] if not
*/
public static function updateItems(int $feedId, DOMElement $channel, SQLite3 $db): array {
try {
foreach ($channel->getElementsByTagName('item') as $rawItem) {
$item = self::itemFields($rawItem);
$existsQuery = $db->prepare(
'SELECT id, published_on, updated_on FROM item WHERE feed_id = :feed AND item_guid = :guid');
$existsQuery->bindValue(':feed', $feedId);
$existsQuery->bindValue(':guid', $item['guid']);
$exists = $existsQuery->execute();
if ($exists) {
$existing = $exists->fetchArray(SQLITE3_ASSOC);
if ($existing) {
if ( $existing['published_on'] != $item['published']
|| $existing['updated_on'] ?? '' != $item['updated'] ?? '') {
self::updateItem($existing['id'], $item, $db);
}
} else {
self::addItem($feedId, $item, $db);
}
} else {
throw new Exception($db->lastErrorMsg());
}
}
} catch (Exception $ex) {
return ['error' => $ex->getMessage()];
}
return ['ok', true];
}
/**
* Refresh a feed
*
* @param string $url The URL of the feed to be refreshed
* @param SQLite3 $db A database connection to use to refresh the feed
* @return array|string[]|true[] ['ok' => true] if successful, ['error' => message] if not
*/
private static function refreshFeed(string $url, SQLite3 $db): array {
$feedQuery = $db->prepare('SELECT id FROM feed WHERE url = :url AND user_id = :user');
$feedQuery->bindValue(':url', $url);
$feedQuery->bindValue(':user', $_REQUEST[Key::USER_ID]);
$feedResult = $feedQuery->execute();
$feedId = $feedResult ? $feedResult->fetchArray(SQLITE3_NUM)[0] : -1;
if ($feedId < 0) return ['error' => "No feed for URL $url found"];
$feed = self::retrieveFeed($url);
if (array_key_exists('error', $feed)) return $feed;
$itemUpdate = self::updateItems($feedId, $feed['channel'], $db);
if (array_key_exists('error', $itemUpdate)) return $itemUpdate;
$urlUpdate = $url == $feed['url'] ? '' : ', url = :url';
$feedUpdate = $db->prepare(<<<SQL
UPDATE feed
SET title = :title,
updated_on = :updated,
checked_on = :checked
$urlUpdate
WHERE id = :id
SQL);
$feedUpdate->bindValue(':title', self::eltValue($feed['channel'], 'title'));
$feedUpdate->bindValue(':updated', $feed['updated']);
$feedUpdate->bindValue(':checked', Data::formatDate('now'));
$feedUpdate->bindValue(':id', $feedId);
if ($urlUpdate != '') $feedUpdate->bindValue(':url', $feed['url']);
$feedUpdate->execute();
return ['ok' => true];
}
/**
* Add an RSS feed
*
* @param string $url The URL of the RSS feed to add
* @return array ['ok' => feedId] if successful, ['error' => message] if not
*/
public static function add(string $url, SQLite3 $db): array {
$feed = self::retrieveFeed($url);
if (array_key_exists('error', $feed)) return $feed;
$query = $db->prepare(<<<'SQL'
INSERT INTO feed (user_id, url, title, updated_on, checked_on)
VALUES (:user, :url, :title, :updated, :checked)
SQL);
$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
$query->bindValue(':url', $feed['url']);
$query->bindValue(':title', self::eltValue($feed['channel'], 'title'));
$query->bindValue(':updated', $feed['updated']);
$query->bindValue(':checked', Data::formatDate('now'));
$result = $query->execute();
$feedId = $result ? $db->lastInsertRowID() : -1;
if ($feedId < 0) return ['error' => $db->lastErrorMsg()];
$result = self::updateItems($feedId, $feed['channel'], $db);
if (array_key_exists('error', $result)) return $result;
return ['ok' => $feedId];
}
/**
* Update an RSS feed
*
* @param array $existing The existing RSS feed
* @param string $url The URL with which the existing feed should be modified
* @return bool[]|string[] [ 'ok' => true ] if successful, [ 'error' => message ] if not
*/
public static function update(array $existing, string $url, SQLite3 $db): array {
$query = $db->prepare('UPDATE feed SET url = :url WHERE id = :id AND user_id = :user');
$query->bindValue(':url', $url);
$query->bindValue(':id', $existing['id']);
$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
$query->execute();
return self::refreshFeed($url, $db);
}
/**
* @param SQLite3 $db
* @return array|true[] ['ok => true] if successful, ['error' => message] if not (may have multiple error lines)
*/
public static function refreshAll(SQLite3 $db): array {
$query = $db->prepare('SELECT url FROM feed WHERE user_id = :user');
$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
$result = $query->execute();
$url = $result ? $result->fetchArray(SQLITE3_NUM) : false;
if ($url) {
$errors = array();
while ($url) {
$updateResult = self::refreshFeed($url[0], $db);
if (array_key_exists('error', $updateResult)) $errors[] = $updateResult['error'];
$url = $result->fetchArray(SQLITE3_NUM);
}
return sizeof($errors) == 0 ? ['ok' => true] : ['error' => implode("\n", $errors)];
}
return ['error' => $db->lastErrorMsg()];
}
}

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<?php
class Key {
/** @var string The $_REQUEST key for teh current user's e-mail address */
public const string USER_EMAIL = 'FRC_USER_EMAIL';
/** @var string The $_REQUEST key for the current user's ID */
public const string USER_ID = 'FRC_USER_ID';
/** @var string The $_REQUEST key for the array of user messages to display */
public const string USER_MSG = 'FRC_USER_MSG';
}

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<?php
/**
* Security functions
*/
class Security {
/** @var int Run as a single user requiring no password */
public const int SINGLE_USER = 0;
/** @var int Run as a single user requiring a password */
public const int SINGLE_USER_WITH_PASSWORD = 1;
/** @var int Require users to provide e-mail address and password */
public const int MULTI_USER = 2;
/**
* Verify that user is logged on
* @param bool $redirectIfAnonymous Whether to redirect the request if there is no user logged on
*/
public static function verifyUser(bool $redirectIfAnonymous = true): void {
switch (SECURITY_MODEL) {
case self::SINGLE_USER:
$user = self::retrieveSingleUser();
break;
case self::SINGLE_USER_WITH_PASSWORD:
die('Single User w/ Password has not yet been implemented');
case self::MULTI_USER:
die('Multi-User Mode has not yet been implemented');
default:
die('Unrecognized security model (' . SECURITY_MODEL . ')');
}
if (!$user && $redirectIfAnonymous) {
header('/logon?returnTo=' . $_SERVER['REQUEST_URI'], true, HTTP_REDIRECT_TEMP);
die();
}
$_REQUEST[Key::USER_ID] = $user['id'];
$_REQUEST[Key::USER_EMAIL] = $user['email'];
}
/**
* Retrieve the single user
* @return array The user information for the single user
*/
private static function retrieveSingleUser(): array {
$user = Data::findUserByEmail('solouser@example.com');
if ($user) return $user;
Data::addUser('solouser@example.com', 'no-password-required');
return Data::findUserByEmail('solouser@example.com');
}
}

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html {
min-height: 100vh;
font-family: sans-serif;
}
body {
margin: 0;
font-size: 1rem;
background: linear-gradient(135deg, #eeeeff, #ddddff, #eeeeff, #ccccff) fixed;
}
a:link, a:visited {
text-decoration: none;
font-weight: bold;
color: navy;
}
a:hover {
text-decoration: underline;
}
header {
padding: 0 1rem .5rem 1rem;
background: linear-gradient(#000032, #000048, #000064);
border-bottom-left-radius: .5rem;
border-bottom-right-radius: .5rem;
color: white;
display: flex;
flex-flow: row nowrap;
justify-content: space-between;
align-items: baseline;
.title {
font-size: 1.5rem;
}
a:link, a:visited {
color: white;
}
}
main {
padding: 0 .5rem;
.item_heading {
margin-bottom: 0;
}
.item_published {
margin-bottom: 1rem;
line-height: 1.2;
}
}
article {
max-width: 60rem;
margin: auto;
.item_content {
border: solid 1px navy;
border-radius: .5rem;
background-color: white;
padding: .5rem;
}
}
input[type=url], input[type=text] {
width: 50%;
font-size: 1rem;
padding: .25rem;
border-radius: .25rem;
}
button,
.action_buttons a:link,
.action_buttons a:visited {
font-size: 1rem;
font-weight: normal;
background-color: navy;
color: white;
padding: .5rem 1rem;
border-radius: .25rem;
cursor: pointer;
border: none;
}
button:hover,
.action_buttons a:hover {
text-decoration: none;
cursor: pointer;
background: linear-gradient(navy, #000032);
}
.action_buttons {
margin: 1rem 0;
display: flex;
flex-flow: row nowrap;
justify-content: space-evenly;
}

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<?php
/**
* Add/Edit Feed Page
*
* Allows users to add or edit RSS feeds
*/
include '../start.php';
Security::verifyUser();
$feedId = array_key_exists('id', $_GET) ? $_GET['id'] : '';
$db = Data::getConnection();
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$isNew = $_POST['id'] == 'new';
if ($isNew) {
$result = Feed::add($_POST['url'], $db);
} else {
$toEdit = Data::retrieveFeedById($_POST['id'], $db);
$result = $toEdit ? Feed::update($toEdit, $_POST['url'], $db) : ['error' => "Feed {$_POST['id']} not found"];
}
if (array_key_exists('ok', $result)) {
add_info('Feed saved successfully');
$feedId = $isNew ? $result['ok'] : $_POST['id'];
} else {
add_error($result['error']);
$feedId = 'error';
}
}
if ($feedId == 'new') {
$title = 'Add RSS Feed';
$feed = [ 'id' => $_GET['id'], 'url' => '' ];
} else {
$title = 'Edit RSS Feed';
if ($feedId == 'error') {
$feed = ['id' => $_POST['id'] ?? '', 'url' => $_POST['url'] ?? ''];
} else {
$feed = Data::retrieveFeedById((int) $feedId, $db);
if (!$feed) {
http_response_code(404);
die();
}
}
}
page_head($title); ?>
<h1><?=$title?></h1>
<article>
<form method=POST action=/feed hx-post=/feed>
<input type=hidden name=id value=<?=$feed['id']?>>
<label>
Feed URL
<input type=url name=url required autofocus value="<?=$feed['url']?>">
</label><br>
<button type=submit>Save</button>
</form>
</article><?php
page_foot();
$db->close();

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<?php
/**
* Home Page
*
* Displays a list of unread feed items for the current user
*/
include '../start.php';
Security::verifyUser();
$db = Data::getConnection();
if (array_key_exists('refresh', $_GET)) {
$refreshResult = Feed::refreshAll($db);
if (array_key_exists('ok', $refreshResult)) {
add_info('All feeds refreshed successfully');
} else {
add_error(nl2br($refreshResult['error']));
}
}
$result = $db->query(<<<'SQL'
SELECT item.id, item.title AS item_title, coalesce(item.updated_on, item.published_on) AS as_of,
feed.title AS feed_title
FROM item
INNER JOIN feed ON feed.id = item.feed_id
WHERE item.is_read = 0
ORDER BY coalesce(item.updated_on, item.published_on) DESC
SQL);
$item = $result ? $result->fetchArray(SQLITE3_ASSOC) : false;
page_head('Welcome'); ?>
<h1>Your Unread Items &nbsp; <a href=/?refresh><small><small><em>(Refresh All Feeds)</em></small></small></a></h1>
<article><?php
if ($item) {
while ($item) { ?>
<p><a href=/item?id=<?=$item['id']?>><?=$item['item_title']?></a><br>
<?=$item['feed_title']?><br><small><em><?=date_time($item['as_of'])?></em></small><?php
$item = $result->fetchArray(SQLITE3_ASSOC);
}
} else { ?>
<p>There are no unread items</p><?php
} ?>
</article><?php
page_foot();
$db->close();

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<?php
/**
* Item View Page
*
* Retrieves and displays an item from a feed belonging to the current user
*/
include '../start.php';
Security::verifyUser();
$db = Data::getConnection();
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
// "Keep as New" button sends a POST request to reset the is_read flag before going back to the list of unread items
$isValidQuery = $db->prepare(<<<'SQL'
SELECT COUNT(*)
FROM item INNER JOIN feed ON feed.id = item.feed_id
WHERE item.id = :id AND feed.user_id = :user
SQL);
$isValidQuery->bindValue(':id', $_POST['id']);
$isValidQuery->bindValue(':user', $_REQUEST[Key::USER_ID]);
$isValidResult = $isValidQuery->execute();
if ($isValidResult && $isValidResult->fetchArray(SQLITE3_NUM)[0] == 1) {
$keepUnread = $db->prepare('UPDATE item SET is_read = 0 WHERE id = :id');
$keepUnread->bindValue(':id', $_POST['id']);
$keepUnread->execute();
}
$db->close();
frc_redirect('/');
}
$query = $db->prepare(<<<'SQL'
SELECT item.title AS item_title, item.item_link, item.published_on, item.updated_on, item.content, item.is_encoded,
feed.title AS feed_title
FROM item INNER JOIN feed ON feed.id = item.feed_id
WHERE item.id = :id
AND feed.user_id = :user
SQL);
$query->bindValue(':id', $_GET['id']);
$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
$result = $query->execute();
$item = $result ? $result->fetchArray(SQLITE3_ASSOC) : false;
if ($item) {
$markRead = $db->prepare('UPDATE item SET is_read = 1 WHERE id = :id');
$markRead->bindValue(':id', $_GET['id']);
$markRead->execute();
}
$published = date_time($item['published_on']);
$updated = isset($item['updated_on']) ? date_time($item['updated_on']) : null;
page_head(htmlentities("{$item['item_title']} | {$item['feed_title']}")); ?>
<h1 class=item_heading>
<a href="<?=$item['item_link']?>" target=_blank rel=noopener><?=$item['item_title']?></a><br>
</h1>
<div class=item_published>
From <strong><?=htmlentities($item['feed_title'])?></strong><br>
Published <?=date_time($item['published_on'])?><?=$updated && $updated != $published ? " (Updated $updated)" : ''?>
</div>
<article>
<div class=item_content><?=str_replace('<a ', '<a target=_blank rel=noopener ', $item['content'])?></div>
<form class=action_buttons action=/item method=POST>
<input type=hidden name=id value=<?=$_GET['id']?>>
<a href="/">Done</a>
<button type=submit>Keep as New</button>
</form>
</article><?php
page_foot();
$db->close();

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<?php
use JetBrains\PhpStorm\NoReturn;
spl_autoload_register(function ($class) {
$file = implode(DIRECTORY_SEPARATOR, [__DIR__, 'lib', "$class.php"]);
if (file_exists($file)) {
require $file;
return true;
}
return false;
});
require 'user-config.php';
Data::ensureDb();
/**
* Add a message to be displayed at the top of the page
*
* @param string $level The level (type) of the message
* @param string $message The message itself
*/
function add_message(string $level, string $message): void {
if (!array_key_exists(Key::USER_MSG, $_REQUEST)) $_REQUEST[Key::USER_MSG] = array();
$_REQUEST[Key::USER_MSG][] = ['level' => $level, 'message' => $message];
}
/**
* Add an error message to be displayed at the top of the page
*
* @param string $message The message to be displayed
*/
function add_error(string $message): void {
add_message('ERROR', $message);
}
/**
* Add an error message to be displayed at the top of the page
*
* @param string $message The message to be displayed
*/
function add_info(string $message): void {
add_message('INFO', $message);
}
/**
* Render the page title
* @param string $title The title of the page being displayed
*/
function page_head(string $title): void {
?><!DOCTYPE html>
<html lang=en>
<head>
<meta name=viewport content="width=device-width, initial-scale=1">
<title><?=$title?> | Feed Reader Central</title>
<link href=/assets/style.css rel=stylesheet>
</head>
<body>
<header>
<a class=title href="/">Feed Reader Central</a>
<div><?php
if (array_key_exists(Key::USER_ID, $_REQUEST)) {
echo '<a href=/feed?id=new>Add Feed</a>';
if ($_REQUEST[Key::USER_EMAIL] != 'solouser@example.com') echo " | {$_REQUEST[Key::USER_EMAIL]}";
} ?>
</div>
</header>
<main hx-target=this><?php
if (array_key_exists(Key::USER_MSG, $_REQUEST)) {
foreach ($_REQUEST[Key::USER_MSG] as $msg) { ?>
<div>
<?=$msg['level'] == 'INFO' ? '' : "<strong>{$msg['level']}</strong><br>"?>
<?=$msg['message']?>
</div><?php
}
}
}
/**
* Render the end of the page
*/
function page_foot(): void {
?></main></body></html><?php
}
/**
* Redirect the user to the given URL
*
* @param string $value A local URL to which the user should be redirected
*/
#[NoReturn]
function frc_redirect(string $value): void {
if (str_starts_with($value, 'http')) {
http_response_code(400);
die();
}
header("Location: $value");
http_response_code(303);
die();
}
/**
* Convert a date/time string to a date/time in the configured format
*
* @param string $value The date/time string
* @return string The standard format of a date/time, or '(invalid date)' if the date could not be parsed
*/
function date_time(string $value): string {
try {
return (new DateTimeImmutable($value))->format(DATE_TIME_FORMAT);
} catch (Exception) {
return '(invalid date)';
}
}

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<?php
/**
* USER CONFIGURATION ITEMS
*
* Editing the values here customizes the behavior of Feed Reader Central
*/
/**
* Which security model should the application use? Options are:
* - Security::SINGLE_USER (no e-mail required, does not require a password)
* - Security::SINGLE_USER_WITH_PASSWORD (no e-mail required, does require a password)
* - Security::MULTI_USER (e-mail and password required for all users)
*
* (NOTE THAT ONLY SINGLE_USER IS CURRENTLY IMPLEMENTED)
*/
const SECURITY_MODEL = Security::SINGLE_USER;
/** The name of the database file where users and feeds should be kept */
const DATABASE_NAME = 'frc.db';
/**
* The format for date/time outputs; see https://www.php.net/manual/en/datetime.format.php for acceptable values
*
* The default, 'F j, Y \a\t g:ia', equates to "August 17, 2023 at 4:45pm"
*/
const DATE_TIME_FORMAT = 'F j, Y \a\t g:ia';
// END USER CONFIGURATION ITEMS
// (editing below this line is not advised)