Code Coverage
 
Lines
Functions and Methods
Classes and Traits
Total
87.00% covered (warning)
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 CRAP
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CaptchaService
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 __construct
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 ensureValid
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 getCaptchaDetails
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 generateToken
100.00% covered (success)
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 createChallenge
83.33% covered (warning)
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 verifySolution
84.91% covered (warning)
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 11.42
1<?php
2
3declare(strict_types=1);
4
5namespace BO\Zmscitizenapi\Services\Captcha;
6
7use BO\Zmscitizenapi\Helper\ClientIpHelper;
8use BO\Zmscitizenapi\Models\CaptchaInterface;
9use BO\Zmsentities\Schema\Entity;
10use Firebase\JWT\JWT;
11use GuzzleHttp\Client;
12use GuzzleHttp\Exception\RequestException;
13
14class CaptchaService extends Entity implements CaptchaInterface
15{
16    public static $schema = "citizenapi/captcha/altchaCaptcha.json";
17/** @var string */
18    public string $service;
19/** @var string */
20    private string $siteKey;
21/** @var string */
22    private string $siteSecret;
23/** @var string */
24    private string $tokenSecret;
25/** @var int */
26    private int $tokenExpirationSeconds;
27/** @var string */
28    public string $challengeUrl;
29/** @var string */
30    public string $verifyUrl;
31/** @var Client */
32    protected Client $httpClient;
33/**
34     * Constructor.
35     */
36    public function __construct()
37    {
38        $this->service = 'CaptchaService';
39        $this->siteKey = \App::$ALTCHA_CAPTCHA_SITE_KEY;
40        $this->siteSecret = \App::$ALTCHA_CAPTCHA_SITE_SECRET;
41        $this->tokenSecret = \App::$CAPTCHA_TOKEN_SECRET;
42        $this->tokenExpirationSeconds = \App::$CAPTCHA_TOKEN_TTL;
43        $this->challengeUrl = \App::$ALTCHA_CAPTCHA_ENDPOINT_CHALLENGE;
44        $this->verifyUrl = \App::$ALTCHA_CAPTCHA_ENDPOINT_VERIFY;
45        $this->httpClient = new Client(['verify' => false]);
46        $this->ensureValid();
47    }
48
49    private function ensureValid()
50    {
51        if (!$this->testValid()) {
52            throw new \InvalidArgumentException("The provided data is invalid according to the schema.");
53        }
54    }
55
56    /**
57     * Return the captcha configuration details.
58     *
59     * @return array
60     */
61    public function getCaptchaDetails(): array
62    {
63        return [
64            'siteKey' => $this->siteKey,
65            'captchaChallenge' => $this->challengeUrl,
66            'captchaVerify' => $this->verifyUrl,
67            'captchaEnabled' => \App::$CAPTCHA_ENABLED
68        ];
69    }
70
71    /**
72     * Generate a JWT for captcha validation.
73     *
74     * @return string
75     */
76    public function generateToken(): string
77    {
78        $payload = [
79            'ip' => ClientIpHelper::getClientIp(),
80            'iat' => time(),
81            'exp' => time() + $this->tokenExpirationSeconds,
82        ];
83
84        return JWT::encode($payload, $this->tokenSecret, 'HS256');
85    }
86
87    /**
88     * Request a new captcha challenge.
89     *
90     * @return array
91     * @throws \Exception
92     */
93    public function createChallenge(): array
94    {
95        try {
96            $response = $this->httpClient->post($this->challengeUrl, [
97                'json' => [
98                    'siteKey' => $this->siteKey,
99                    'siteSecret' => $this->siteSecret,
100                    'clientAddress' => ClientIpHelper::getClientIp(),
101                ]
102            ]);
103
104            $responseData = json_decode((string) $response->getBody(), true);
105
106            if (json_last_error() !== JSON_ERROR_NONE) {
107                throw new \Exception('Error decoding the JSON response');
108            }
109
110            $challenge = $responseData['challenge'] ?? null;
111
112            if ($challenge === null) {
113                throw new \Exception('Missing challenge data');
114            }
115
116            return $challenge;
117        } catch (RequestException $e) {
118            return [
119                'meta' => ['success' => false, 'error' => 'Request error: ' . $e->getMessage()],
120                'data' => null,
121            ];
122        } catch (\Throwable $e) {
123            return [
124                'meta' => ['success' => false, 'error' => $e->getMessage()],
125                'data' => null,
126            ];
127        }
128    }
129
130    /**
131     * Verify the captcha solution.
132     *
133     * @param string $payload
134     * @return mixed
135     * @throws \Exception
136     */
137    public function verifySolution(?string $payload): array
138    {
139        if (!$payload) {
140            return [
141                'meta' => ['success' => false, 'error' => 'No payload provided'],
142                'data' => null,
143            ];
144        }
145
146        $decodedJson = base64_decode(strtr($payload, '-_', '+/'));
147        if (!$decodedJson) {
148            return [
149                'meta' => ['success' => false, 'error' => 'Payload could not be decoded'],
150                'data' => null,
151            ];
152        }
153
154        $decodedPayload = json_decode($decodedJson, true);
155        if (json_last_error() !== JSON_ERROR_NONE || !is_array($decodedPayload)) {
156            return [
157                'meta' => ['success' => false, 'error' => 'Invalid JSON in payload'],
158                'data' => null,
159            ];
160        }
161
162        try {
163            $response = $this->httpClient->post($this->verifyUrl, [
164                'json' => [
165                    'siteKey' => $this->siteKey,
166                    'siteSecret' => $this->siteSecret,
167                    'clientAddress' => ClientIpHelper::getClientIp(),
168                    'payload' => $decodedPayload,
169                ]
170            ]);
171
172            $responseData = json_decode((string) $response->getBody(), true);
173
174            if (json_last_error() !== JSON_ERROR_NONE || !is_array($responseData)) {
175                throw new \Exception('Response from Captcha service is not valid JSON');
176            }
177
178            if (!array_key_exists('valid', $responseData)) {
179                return [
180                    'meta' => ['success' => false, 'error' => 'Response does not contain a "valid" field'],
181                    'data' => $responseData,
182                ];
183            }
184
185            if ($responseData['valid'] !== true) {
186                return [
187                    'meta' => ['success' => false, 'error' => 'Captcha verification failed'],
188                    'data' => $responseData,
189                ];
190            }
191
192            return [
193                'meta' => ['success' => true],
194                'data' => $responseData,
195                'token' => $this->generateToken(),
196            ];
197        } catch (RequestException $e) {
198            return [
199                'meta' => ['success' => false, 'error' => 'Request error: ' . $e->getMessage()],
200                'data' => null,
201            ];
202        } catch (\Throwable $e) {
203            return [
204                'meta' => ['success' => false, 'error' => $e->getMessage()],
205                'data' => null,
206            ];
207        }
208    }
209}