thinkrank / includes / ai / class-perplexity-client.php

class-perplexity-client.php in ThinkRank AI SEO – AI SEO Plugin for WordPress: Schema, XML Sitemaps, Meta Tags, Search Console & Local SEO 2.0.0, at includes/ai/class-perplexity-client.php

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1	<?php
2	/**
3	* Perplexity API Client (Brand Visibility probes only).
4	*
5	* Perplexity exposes an OpenAI-compatible Chat Completions endpoint, so the
6	* request/response handling mirrors OpenAI_Client. It exists as its own client
7	* for one reason: Perplexity answers are search-grounded — the model
8	* retrieves live web results before answering — which makes it the closest
9	* available proxy for what a real person sees in an AI answer engine.
10	*
11	* That is also why this client is deliberately NOT registered as a general
12	* ThinkRank AI provider: it is tuned for "what would an assistant tell a user
13	* about this brand", not for metadata generation or content briefs.
14	*
15	* @package ThinkRank\AI
16	* @since 1.28.0
17	*/
18
19	declare(strict_types=1);
20
21	namespace ThinkRank\AI;
22
23	// Prevent direct access
24	if (!defined('ABSPATH')) {
25	exit;
26	}
27
28	/**
29	* Minimal Perplexity chat client used by the Brand Visibility runner.
30	*/
31	class Perplexity_Client {
32
33	/**
34	* Perplexity API base URL.
35	*/
36	private const API_BASE_URL = 'https://api.perplexity.ai';
37
38	/**
39	* Default search-grounded model.
40	*/
41	public const DEFAULT_MODEL = 'sonar';
42
43	/**
44	* API key.
45	*
46	* @var string
47	*/
48	private string $api_key;
49
50	/**
51	* Model id.
52	*
53	* @var string
54	*/
55	private string $model;
56
57	/**
58	* Request timeout, seconds.
59	*
60	* @var int
61	*/
62	private int $timeout;
63
64	/**
65	* Constructor.
66	*
67	* @param string $api_key Perplexity API key.
68	* @param string $model Model id.
69	* @param int $timeout Timeout in seconds.
70	*/
71	public function __construct(string $api_key, string $model = self::DEFAULT_MODEL, int $timeout = 45) {
72	$this->api_key = $api_key;
73	$this->model = '' !== $model ? $model : self::DEFAULT_MODEL;
74	$this->timeout = $timeout;
75	}
76
77	/**
78	* Generate a completion.
79	*
80	* Returns the raw decoded body so Manager::request_completion() can read it
81	* with the same `choices[0].message.content` path it uses for OpenAI.
82	*
83	* @param string $prompt User prompt.
84	* @param array $options max_tokens, temperature.
85	* @return array Decoded API response.
86	* @throws \Exception On transport failure or a non-2xx response.
87	*/
88	public function generate_completion(string $prompt, array $options = []): array {
89	$body = [
90	'model' => $this->model,
91	'messages' => [
92	['role' => 'user', 'content' => $prompt],
93	],
94	'max_tokens' => (int) ($options['max_tokens'] ?? 1000),
95	'temperature' => (float) ($options['temperature'] ?? 0.4),
96	];
97
98	$response = wp_remote_post(self::API_BASE_URL . '/chat/completions', [
99	'timeout' => $this->timeout,
100	'headers' => [
101	'Authorization' => 'Bearer ' . $this->api_key,
102	'Content-Type' => 'application/json',
103	'User-Agent' => 'ThinkRank/' . THINKRANK_VERSION,
104	],
105	'body' => wp_json_encode($body),
106	]);
107
108	if (is_wp_error($response)) {
109	throw new \Exception('Perplexity request failed: ' . esc_html($response->get_error_message()));
110	}
111
112	$status = wp_remote_retrieve_response_code($response);
113	$raw = wp_remote_retrieve_body($response);
114
115	if ($status >= 400) {
116	$decoded = json_decode($raw, true);
117	$message = $decoded['error']['message'] ?? ($decoded['detail'] ?? 'Unknown API error');
118	throw new \Exception(sprintf('Perplexity API error (%d): %s', (int) $status, esc_html((string) $message)));
119	}
120
121	$data = json_decode($raw, true);
122
123	if (!is_array($data)) {
124	throw new \Exception('Unexpected non-array response from Perplexity API');
125	}
126
127	return $data;
128	}
129
130	/**
131	* Lightweight credential check.
132	*
133	* @return bool True when the key answers a minimal request.
134	*/
135	public function test_connection(): bool {
136	try {
137	$this->generate_completion('Reply with OK.', ['max_tokens' => 5]);
138	return true;
139	} catch (\Exception $e) {
140	return false;
141	}
142	}
143	}
144