user-submitted-posts / recaptcha / ReCaptcha / ReCaptcha.php

ReCaptcha.php in User Submitted Posts – Enable Users to Submit Posts from the Front End 20230806, at recaptcha/ReCaptcha/ReCaptcha.php

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1	<?php
2	/**
3	* This is a PHP library that handles calling reCAPTCHA.
4	*
5	* BSD 3-Clause License
6	* @copyright (c) 2019, Google Inc.
7	* @link https://www.google.com/recaptcha
8	* All rights reserved.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions are met:
12	* 1. Redistributions of source code must retain the above copyright notice, this
13	* list of conditions and the following disclaimer.
14	*
15	* 2. Redistributions in binary form must reproduce the above copyright notice,
16	* this list of conditions and the following disclaimer in the documentation
17	* and/or other materials provided with the distribution.
18	*
19	* 3. Neither the name of the copyright holder nor the names of its
20	* contributors may be used to endorse or promote products derived from
21	* this software without specific prior written permission.
22	*
23	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26	* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29	* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
30	* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33	*/
34
35	namespace ReCaptcha;
36
37	/**
38	* reCAPTCHA client.
39	*/
40	class ReCaptcha
41	{
42	/**
43	* Version of this client library.
44	* @const string
45	*/
46	const VERSION = 'php_1.2.3';
47
48	/**
49	* URL for reCAPTCHA siteverify API
50	* @const string
51	*/
52	const SITE_VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify';
53
54	/**
55	* Invalid JSON received
56	* @const string
57	*/
58	const E_INVALID_JSON = 'invalid-json';
59
60	/**
61	* Could not connect to service
62	* @const string
63	*/
64	const E_CONNECTION_FAILED = 'connection-failed';
65
66	/**
67	* Did not receive a 200 from the service
68	* @const string
69	*/
70	const E_BAD_RESPONSE = 'bad-response';
71
72	/**
73	* Not a success, but no error codes received!
74	* @const string
75	*/
76	const E_UNKNOWN_ERROR = 'unknown-error';
77
78	/**
79	* ReCAPTCHA response not provided
80	* @const string
81	*/
82	const E_MISSING_INPUT_RESPONSE = 'missing-input-response';
83
84	/**
85	* Expected hostname did not match
86	* @const string
87	*/
88	const E_HOSTNAME_MISMATCH = 'hostname-mismatch';
89
90	/**
91	* Expected APK package name did not match
92	* @const string
93	*/
94	const E_APK_PACKAGE_NAME_MISMATCH = 'apk_package_name-mismatch';
95
96	/**
97	* Expected action did not match
98	* @const string
99	*/
100	const E_ACTION_MISMATCH = 'action-mismatch';
101
102	/**
103	* Score threshold not met
104	* @const string
105	*/
106	const E_SCORE_THRESHOLD_NOT_MET = 'score-threshold-not-met';
107
108	/**
109	* Challenge timeout
110	* @const string
111	*/
112	const E_CHALLENGE_TIMEOUT = 'challenge-timeout';
113
114	/**
115	* Shared secret for the site.
116	* @var string
117	*/
118	private $secret;
119
120	/**
121	* Method used to communicate with service. Defaults to POST request.
122	* @var RequestMethod
123	*/
124	private $requestMethod;
125
126	/**
127	* Create a configured instance to use the reCAPTCHA service.
128	*
129	* @param string $secret The shared key between your site and reCAPTCHA.
130	* @param RequestMethod $requestMethod method used to send the request. Defaults to POST.
131	* @throws \RuntimeException if $secret is invalid
132	*/
133	public function __construct($secret, RequestMethod $requestMethod = null)
134	{
135	if (empty($secret)) {
136	throw new \RuntimeException('No secret provided');
137	}
138
139	if (!is_string($secret)) {
140	throw new \RuntimeException('The provided secret must be a string');
141	}
142
143	$this->secret = $secret;
144	$this->requestMethod = (is_null($requestMethod)) ? new RequestMethod\Post() : $requestMethod;
145	}
146
147	/**
148	* Calls the reCAPTCHA siteverify API to verify whether the user passes
149	* CAPTCHA test and additionally runs any specified additional checks
150	*
151	* @param string $response The user response token provided by reCAPTCHA, verifying the user on your site.
152	* @param string $remoteIp The end user's IP address.
153	* @return Response Response from the service.
154	*/
155	public function verify($response, $remoteIp = null)
156	{
157	// Discard empty solution submissions
158	if (empty($response)) {
159	$recaptchaResponse = new Response(false, array(self::E_MISSING_INPUT_RESPONSE));
160	return $recaptchaResponse;
161	}
162
163	$params = new RequestParameters($this->secret, $response, $remoteIp, self::VERSION);
164	$rawResponse = $this->requestMethod->submit($params);
165	$initialResponse = Response::fromJson($rawResponse);
166	$validationErrors = array();
167
168	if (isset($this->hostname) && strcasecmp($this->hostname, $initialResponse->getHostname()) !== 0) {
169	$validationErrors[] = self::E_HOSTNAME_MISMATCH;
170	}
171
172	if (isset($this->apkPackageName) && strcasecmp($this->apkPackageName, $initialResponse->getApkPackageName()) !== 0) {
173	$validationErrors[] = self::E_APK_PACKAGE_NAME_MISMATCH;
174	}
175
176	if (isset($this->action) && strcasecmp($this->action, $initialResponse->getAction()) !== 0) {
177	$validationErrors[] = self::E_ACTION_MISMATCH;
178	}
179
180	if (isset($this->threshold) && $this->threshold > $initialResponse->getScore()) {
181	$validationErrors[] = self::E_SCORE_THRESHOLD_NOT_MET;
182	}
183
184	if (isset($this->timeoutSeconds)) {
185	$challengeTs = strtotime($initialResponse->getChallengeTs());
186
187	if ($challengeTs > 0 && time() - $challengeTs > $this->timeoutSeconds) {
188	$validationErrors[] = self::E_CHALLENGE_TIMEOUT;
189	}
190	}
191
192	if (empty($validationErrors)) {
193	return $initialResponse;
194	}
195
196	return new Response(
197	false,
198	array_merge($initialResponse->getErrorCodes(), $validationErrors),
199	$initialResponse->getHostname(),
200	$initialResponse->getChallengeTs(),
201	$initialResponse->getApkPackageName(),
202	$initialResponse->getScore(),
203	$initialResponse->getAction()
204	);
205	}
206
207	/**
208	* Provide a hostname to match against in verify()
209	* This should be without a protocol or trailing slash, e.g. www.google.com
210	*
211	* @param string $hostname Expected hostname
212	* @return ReCaptcha Current instance for fluent interface
213	*/
214	public function setExpectedHostname($hostname)
215	{
216	$this->hostname = $hostname;
217	return $this;
218	}
219
220	/**
221	* Provide an APK package name to match against in verify()
222	*
223	* @param string $apkPackageName Expected APK package name
224	* @return ReCaptcha Current instance for fluent interface
225	*/
226	public function setExpectedApkPackageName($apkPackageName)
227	{
228	$this->apkPackageName = $apkPackageName;
229	return $this;
230	}
231
232	/**
233	* Provide an action to match against in verify()
234	* This should be set per page.
235	*
236	* @param string $action Expected action
237	* @return ReCaptcha Current instance for fluent interface
238	*/
239	public function setExpectedAction($action)
240	{
241	$this->action = $action;
242	return $this;
243	}
244
245	/**
246	* Provide a threshold to meet or exceed in verify()
247	* Threshold should be a float between 0 and 1 which will be tested as response >= threshold.
248	*
249	* @param float $threshold Expected threshold
250	* @return ReCaptcha Current instance for fluent interface
251	*/
252	public function setScoreThreshold($threshold)
253	{
254	$this->threshold = floatval($threshold);
255	return $this;
256	}
257
258	/**
259	* Provide a timeout in seconds to test against the challenge timestamp in verify()
260	*
261	* @param int $timeoutSeconds Expected hostname
262	* @return ReCaptcha Current instance for fluent interface
263	*/
264	public function setChallengeTimeout($timeoutSeconds)
265	{
266	$this->timeoutSeconds = $timeoutSeconds;
267	return $this;
268	}
269	}
270