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/connlink/test1/ui/serpapi_proxy.php

<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store, max-age=0');
header('X-Content-Type-Options: nosniff');

function respond(array $payload, int $status = 200): never
{
    http_response_code($status);
    echo json_encode($payload, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    exit;
}

if (($_SERVER['REQUEST_METHOD'] ?? 'GET') !== 'GET') {
    respond(['ok' => false, 'error' => 'GET required'], 405);
}

$documentRoot = rtrim((string)($_SERVER['DOCUMENT_ROOT'] ?? ''), '/\\');

$configCandidates = array_values(array_unique(array_filter([
    $documentRoot !== '' ? $documentRoot . '/private/config.php' : null,
    $documentRoot !== '' ? dirname($documentRoot) . '/private/config.php' : null,
    dirname(__DIR__, 3) . '/private/config.php',
    dirname(__DIR__, 4) . '/private/config.php',
])));

$configPath = '';

foreach ($configCandidates as $candidate) {
    if (!is_file($candidate)) {
        continue;
    }

require_once $candidate;
    $configPath = $candidate;
    break;
}

if ($configPath === '') {
    respond([
        'ok' => false,
        'error' => 'Private config file was not found.',
        'checked' => $configCandidates,
    ], 500);
}

$providerKeys = $GLOBALS['SIMON_PROVIDER_KEYS'] ?? [];

if (!is_array($providerKeys)) {
    $providerKeys = [];
}

$apiKey = trim((string)($providerKeys['SERPAPI_KEY'] ?? ''));

if ($apiKey === '' && defined('SERPAPI_KEY')) {
    $apiKey = trim((string)SERPAPI_KEY);
}
if ($apiKey === '' && defined('SERPAPI_API_KEY')) {
    $apiKey = trim((string)SERPAPI_API_KEY);
}
if ($apiKey === '' && ($env = getenv('SERPAPI_KEY')) !== false) {
    $apiKey = trim((string)$env);
}
if ($apiKey === '' && ($env = getenv('SERPAPI_API_KEY')) !== false) {
    $apiKey = trim((string)$env);
}

if ($apiKey === '') {
    respond([
        'ok' => false,
        'error' => 'SERPAPI_KEY was not found in SIMON_PROVIDER_KEYS.',
        'config_loaded' => $configPath,
        'available_keys' => array_keys($providerKeys),
    ], 503);
}

$query = trim((string)($_GET['q'] ?? ''));
if ($query === '') {
    respond(['ok' => false, 'error' => 'Missing q parameter'], 400);
}

if ((function_exists('mb_strlen') ? mb_strlen($query) : strlen($query)) > 300) {
    respond(['ok' => false, 'error' => 'Query is too long'], 400);
}

$num = (int)($_GET['num'] ?? 10);
$num = max(1, min(20, $num));
$country = preg_replace('/[^a-z]/i', '', (string)($_GET['gl'] ?? 'us')) ?: 'us';
$language = preg_replace('/[^a-z-]/i', '', (string)($_GET['hl'] ?? 'en')) ?: 'en';

$params = [
    'engine' => 'google',
    'q' => $query,
    'api_key' => $apiKey,
    'num' => $num,
    'gl' => strtolower($country),
    'hl' => strtolower($language),
    'safe' => 'active',
    'no_cache' => 'true',
];

$url = 'https://serpapi.com/search.json?' . http_build_query($params, '', '&', PHP_QUERY_RFC3986);

$ch = curl_init($url);
if ($ch === false) {
    respond(['ok' => false, 'error' => 'Unable to initialize search request'], 500);
}

curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_CONNECTTIMEOUT => 8,
    CURLOPT_TIMEOUT => 22,
    CURLOPT_USERAGENT => 'SIMON-Search/1.0 (+https://www.gaylordsinclair.com/)',
    CURLOPT_HTTPHEADER => ['Accept: application/json'],
]);

$body = curl_exec($ch);
$curlError = curl_error($ch);
$status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($body === false || $curlError !== '') {
    respond(['ok' => false, 'error' => 'SerpAPI connection failed: ' . $curlError], 502);
}

$data = json_decode($body, true);
if (!is_array($data)) {
    respond(['ok' => false, 'error' => 'SerpAPI returned invalid JSON'], 502);
}

if ($status >= 400 || isset($data['error'])) {
    respond([
        'ok' => false,
        'error' => (string)($data['error'] ?? ('SerpAPI HTTP ' . $status))
    ], $status >= 400 ? $status : 502);
}

$results = [];

$addResult = static function (array &$target, string $title, string $snippet, string $link, string $type, int $position = 0, string $thumbnail = ''): void {
    $title = trim($title);
    $link = trim($link);
    if ($title === '' || $link === '') {
        return;
    }
    $target[] = [
        'title' => $title,
        'snippet' => trim(strip_tags($snippet)),
        'url' => $link,
        'source' => 'SerpAPI',
        'result_type' => $type,
        'position' => $position,
        'thumbnail' => trim($thumbnail),
    ];
};

if (isset($data['answer_box']) && is_array($data['answer_box'])) {
    $answer = $data['answer_box'];
    $addResult(
        $results,
        (string)($answer['title'] ?? $answer['answer'] ?? 'Featured Answer'),
        (string)($answer['snippet'] ?? $answer['answer'] ?? $answer['result'] ?? ''),
        (string)($answer['link'] ?? $answer['displayed_link'] ?? ''),
        'answer_box',
        0,
        (string)($answer['thumbnail'] ?? $answer['image'] ?? '')
    );
}

if (isset($data['knowledge_graph']) && is_array($data['knowledge_graph'])) {
    $kg = $data['knowledge_graph'];
    $addResult(
        $results,
        (string)($kg['title'] ?? 'Knowledge Graph'),
        (string)($kg['description'] ?? $kg['type'] ?? ''),
        (string)($kg['website'] ?? $kg['source']['link'] ?? ''),
        'knowledge_graph',
        0,
        (string)($kg['thumbnail'] ?? $kg['image'] ?? '')
    );
}

foreach (($data['organic_results'] ?? []) as $row) {
    if (!is_array($row)) {
        continue;
    }
    $addResult(
        $results,
        (string)($row['title'] ?? ''),
        (string)($row['snippet'] ?? $row['snippet_highlighted_words'][0] ?? ''),
        (string)($row['link'] ?? ''),
        'organic',
        (int)($row['position'] ?? 0),
        (string)($row['thumbnail'] ?? $row['favicon'] ?? '')
    );
}

foreach (($data['related_questions'] ?? []) as $row) {
    if (!is_array($row)) {
        continue;
    }
    $addResult(
        $results,
        (string)($row['question'] ?? ''),
        (string)($row['snippet'] ?? ''),
        (string)($row['link'] ?? ''),
        'related_question',
        0,
        (string)($row['thumbnail'] ?? '')
    );
}

// Remove duplicate URLs while preserving the most useful ordering.
$seen = [];
$deduped = [];
foreach ($results as $result) {
    $key = strtolower(rtrim((string)$result['url'], '/'));
    if ($key === '' || isset($seen[$key])) {
        continue;
    }
    $seen[$key] = true;
    $deduped[] = $result;
    if (count($deduped) >= $num + 6) {
        break;
    }
}

respond([
    'ok' => true,
    'provider' => 'SerpAPI',
    'query' => $query,
    'results' => $deduped,
    'search_metadata' => [
        'status' => (string)($data['search_metadata']['status'] ?? 'Success'),
        'processed_at' => gmdate('c'),
        'total_results' => $data['search_information']['total_results'] ?? null,
    ],
]);

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