271 lines
8.2 KiB
PHP
271 lines
8.2 KiB
PHP
<?php
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class Agent {
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private $db;
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public function __construct($database) {
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$this->db = $database->getConnection();
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}
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// get details of a specified agent ID (or all) in a specified platform ID
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public function getAgentDetails($platform_id, $agent_id = '') {
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$sql = 'SELECT
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ja.id,
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ja.platform_id,
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ja.agent_type_id,
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ja.url,
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ja.secret_key,
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jat.description AS agent_description,
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jat.endpoint AS agent_endpoint
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FROM
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jilo_agents ja
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JOIN
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jilo_agent_types jat ON ja.agent_type_id = jat.id
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WHERE
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platform_id = :platform_id';
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if ($agent_id !== '') {
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$sql .= ' AND ja.id = :agent_id';
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}
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$query = $this->db->prepare($sql);
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$query->bindParam(':platform_id', $platform_id);
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if ($agent_id !== '') {
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$query->bindParam(':agent_id', $agent_id);
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}
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$query->execute();
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return $query->fetchAll(PDO::FETCH_ASSOC);
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}
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// get details of a specified agent ID
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public function getAgentIDDetails($agent_id) {
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$sql = 'SELECT
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ja.id,
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ja.platform_id,
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ja.agent_type_id,
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ja.url,
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ja.secret_key,
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jat.description AS agent_description,
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jat.endpoint AS agent_endpoint
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FROM
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jilo_agents ja
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JOIN
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jilo_agent_types jat ON ja.agent_type_id = jat.id
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WHERE
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ja.id = :agent_id';
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$query = $this->db->prepare($sql);
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$query->bindParam(':agent_id', $agent_id);
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$query->execute();
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return $query->fetchAll(PDO::FETCH_ASSOC);
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}
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// get agent types
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public function getAgentTypes() {
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$sql = 'SELECT *
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FROM jilo_agent_types
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ORDER BY id';
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$query = $this->db->prepare($sql);
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$query->execute();
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return $query->fetchAll(PDO::FETCH_ASSOC);
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}
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// add new agent
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public function addAgent($platform_id, $newAgent) {
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try {
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$sql = 'INSERT INTO jilo_agents
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(platform_id, agent_type_id, url, secret_key)
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VALUES
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(:platform_id, :agent_type_id, :url, :secret_key)';
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$query = $this->db->prepare($sql);
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$query->execute([
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':platform_id' => $platform_id,
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':agent_type_id' => $newAgent['type_id'],
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':url' => $newAgent['url'],
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':secret_key' => $newAgent['secret_key'],
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]);
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return true;
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} catch (Exception $e) {
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return $e->getMessage();
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}
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}
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// edit an existing agent
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public function editAgent($platform_id, $updatedAgent) {
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try {
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$sql = 'UPDATE jilo_agents SET
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agent_type_id = :agent_type_id,
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url = :url,
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secret_key = :secret_key
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WHERE
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id = :agent_id
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AND
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platform_id = :platform_id';
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$query = $this->db->prepare($sql);
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$query->execute([
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':agent_type_id' => $updatedAgent['agent_type_id'],
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':url' => $updatedAgent['url'],
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':secret_key' => $updatedAgent['secret_key'],
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':agent_id' => $updatedAgent['id'],
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':platform_id' => $platform_id,
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]);
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return true;
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} catch (Exception $e) {
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return $e->getMessage();
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}
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}
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// delete an agent
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public function deleteAgent($agent_id) {
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try {
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$sql = 'DELETE FROM jilo_agents
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WHERE
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id = :agent_id';
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$query = $this->db->prepare($sql);
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$query->bindParam(':agent_id', $agent_id);
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$query->execute();
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return true;
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} catch (Exception $e) {
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return $e->getMessage();
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}
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}
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// check for agent cache
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public function checkAgentCache($agent_id) {
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$agent_cache_name = 'agent' . $agent_id . '_cache';
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$agent_cache_time = 'agent' . $agent_id . '_time';
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return isset($_SESSION[$agent_cache_name]) && isset($_SESSION[$agent_cache_time]) && (time() - $_SESSION[$agent_cache_time] < 600);
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}
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// method for base64 URL encoding for JWT tokens
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private function base64UrlEncode($data) {
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return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
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}
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// generate a JWT token for jilo agent
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public function generateAgentToken($payload, $secret_key) {
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// header
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$header = json_encode([
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'typ' => 'JWT',
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'alg' => 'HS256'
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]);
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$base64Url_header = $this->base64UrlEncode($header);
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// payload
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$payload = json_encode($payload);
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$base64Url_payload = $this->base64UrlEncode($payload);
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// signature
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$signature = hash_hmac('sha256', $base64Url_header . "." . $base64Url_payload, $secret_key, true);
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$base64Url_signature = $this->base64UrlEncode($signature);
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// build the JWT
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$jwt = $base64Url_header . "." . $base64Url_payload . "." . $base64Url_signature;
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return $jwt;
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}
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// fetch result from jilo agent API
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public function fetchAgent($agent_id, $force = false) {
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// we need agent details for URL and JWT token
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$agentDetails = $this->getAgentIDDetails($agent_id);
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// Safe exit in case the agent is not found
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if (empty($agentDetails)) {
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return json_encode(['error' => 'Agent not found']);
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}
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$agent = $agentDetails[0];
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$agent_cache_name = 'agent' . $agent_id . '_cache';
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$agent_cache_time = 'agent' . $agent_id . '_time';
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// check if the cache is still valid, unless force-refresh is requested
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if (!$force && $this->checkAgentCache($agent_id)) {
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return $_SESSION[$agent_cache_name];
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}
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// generate the JWT token
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$payload = [
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'agent_id' => $agent_id,
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'timestamp' => time()
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];
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$jwt = $this->generateAgentToken($payload, $agent['secret_key']);
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// Make the API request
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$ch = curl_init();
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curl_setopt($ch, CURLOPT_URL, $agent['url'] . $agent['agent_endpoint']);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($ch, CURLOPT_TIMEOUT, 10); // timeout 10 seconds
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curl_setopt($ch, CURLOPT_HTTPHEADER, [
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'Authorization: Bearer ' . $jwt,
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'Content-Type: application/json'
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]);
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$response = curl_exec($ch);
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$curl_error = curl_error($ch);
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$curl_errno = curl_errno($ch);
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$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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curl_close($ch);
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// curl error
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if ($curl_errno) {
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return json_encode(['error' => 'curl error: ' . $curl_error]);
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}
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// response is not 200 OK
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if ($http_code !== 200) {
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return json_encode(['error' => 'HTTP error: ' . $http_code]);
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}
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// other custom error(s)
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if (strpos($response, 'Auth header not received') !== false) {
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return json_encode(['error' => 'Auth header not received']);
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}
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// Cache the result and the timestamp if the response is successful
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// We decode it so that it's pure JSON and not escaped
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$_SESSION[$agent_cache_name] = json_decode($response, true);
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$_SESSION[$agent_cache_time] = time();
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return $response;
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}
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// clear agent cache
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public function clearAgentCache($agent_id) {
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$_SESSION["agent{$agent_id}_cache"] = '';
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$_SESSION["agent{$agent_id}_cache_time"] = '';
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}
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// get latest stored jilo agents data
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public function getLatestData($platform_id, $agent_type, $metric_type) {
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// retrieves data already stored in db from another function (or the jilo-server to-be)
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}
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}
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?>
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