198 lines
7.4 KiB
PHP
198 lines
7.4 KiB
PHP
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<?php
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/*
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*
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* @(#) $Id: form_recaptcha.php,v 1.1 2012/09/16 11:19:33 mlemos Exp $
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*
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*/
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class form_recaptcha_class extends form_custom_class
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{
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var $format = '<div>{image}</div>
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<div>{instructions_visual}{instructions_audio} {input}</div>
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<div>{refresh_btn} {visual_challenge}{audio_challenge} {help_btn}</div>';
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var $validation_error_message = 'It was not entered the correct text.';
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var $key = '';
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var $private_key = '';
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var $valid = 0;
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var $widget = '';
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var $challenge = '';
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var $response = '';
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var $text = array(
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'instructions_visual'=>'Enter the words above',
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'instructions_audio'=>'Enter the numbers you hear',
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'visual_challenge'=>'Enter text in an image instead',
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'audio_challenge'=>'Enter numbers you hear instead',
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'refresh_btn'=>'Try another',
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'help_btn'=>'Help',
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'play_again'=>'Play the sound again',
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'cant_hear_this'=>'Download the sound as a MP3 file',
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'image_alt_text'=>'Image with text to enter'
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);
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var $tab_index = '';
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Function CheckRequirements()
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{
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if(!class_exists('http_class'))
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return('the HTTP class to access the Recaptcha server is not available');
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return('');
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}
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Function AddInput(&$form, $arguments)
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{
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if(strlen($error = $this->CheckRequirements()))
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return($error);
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if(!IsSet($arguments['Key'])
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|| strlen($arguments['Key']) != 40)
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return('it was not specified a valid Recaptcha public key');
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$this->key = $arguments['Key'];
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if(!IsSet($arguments['PrivateKey'])
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|| strlen($arguments['PrivateKey']) != 40)
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return('it was not specified a valid Recaptcha private key');
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$this->private_key = $arguments['PrivateKey'];
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if(IsSet($arguments['ValidationErrorMessage']))
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{
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if(strlen($arguments['ValidationErrorMessage']))
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$this->validation_error_message = $arguments['ValidationErrorMessage'];
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else
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return('it was not specified a valid validation error message');
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}
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if(IsSet($arguments['Text']))
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{
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if(GetType($text = $arguments['Text']) != 'array')
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return('it was not specified a valid array with Recaptcha text definitions');
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Reset($text);
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$tt = count($text);
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for($t = 0; $t < $tt; ++$t)
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{
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$k = Key($text);
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if(!IsSet($this->text[$k]))
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return($k.' is not a supported reCAPTCHA text definition');
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$this->text[$k] = $text[$k];
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Next($text);
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}
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}
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Reset($this->text);
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$this->widget = $this->GenerateInputID($form, $this->input, 'widget');
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$this->challenge = 'recaptcha_challenge_field';
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$this->focus_input = $this->response = 'recaptcha_response_field';
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$input_arguments = array(
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'NAME'=>$this->challenge,
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'TYPE'=>'textarea',
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'COLS'=>40,
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'ROWS'=>3
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);
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if(strlen($error = $form->AddInput($input_arguments)))
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return($error);
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$input_arguments = array(
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'NAME'=>$this->response,
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'ID'=>$this->response,
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'TYPE'=>'text',
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'ValidateAsNotEmpty'=>1,
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'ValidationErrorMessage'=>$this->validation_error_message,
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'ONKEYPRESS'=>'return(event.keyCode!=13)'
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);
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if(IsSet($arguments['DependentValidation']))
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$input_arguments['DependentValidation'] = $arguments['DependentValidation'];
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if(IsSet($arguments['InputClass']))
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$input_arguments['CLASS'] = $arguments['InputClass'];
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if(IsSet($arguments['InputStyle']))
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$input_arguments['STYLE'] = $arguments['InputStyle'];
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if(IsSet($arguments['InputTabIndex']))
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$this->tab_index = $input_arguments['TABINDEX'] = $arguments['InputTabIndex'];
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if(IsSet($arguments['InputExtraAttributes']))
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$input_arguments['ExtraAttributes'] = $arguments['InputExtraAttributes'];
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if(strlen($error = $form->AddInput($input_arguments)))
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return($error);
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if(IsSet($arguments['Format']))
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$this->format = $arguments['Format'];
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$this->valid_marks = array(
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'input'=>array(
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'input'=>$this->response,
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),
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'data'=>array(
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'image'=>'<div id="recaptcha_image"></div>',
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'instructions_visual'=>'<span class="recaptcha_only_if_image">'.HtmlSpecialChars($this->text['instructions_visual']).'</span>',
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'instructions_audio'=>'<span class="recaptcha_only_if_audio">'.HtmlSpecialChars($this->text['instructions_audio']).'</span>',
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'refresh_btn'=>'<span><a href="javascript:Recaptcha.reload()">'.HtmlSpecialChars($this->text['refresh_btn']).'</a></span>',
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'audio_challenge'=>'<span class="recaptcha_only_if_image"><a href="javascript:Recaptcha.switch_type(\'audio\')">'.HtmlSpecialChars($this->text['audio_challenge']).'</a></span>',
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'visual_challenge'=>'<span class="recaptcha_only_if_audio"><a href="javascript:Recaptcha.switch_type(\'image\')">'.HtmlSpecialChars($this->text['visual_challenge']).'</a></span>',
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'help_btn'=>'<span><a href="javascript:Recaptcha.showhelp()">'.HtmlSpecialChars($this->text['help_btn']).'</a></span>'
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)
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);
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return '';
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}
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Function LoadInputValues(&$form, $submitted)
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{
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if(!$submitted)
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return('');
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$http = new http_class;
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$http->timeout = 60;
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$http->data_timeout = 60;
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$http->debug = 0;
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$http->log_debug = 1;
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$http->html_debug = 0;
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$error = $http->GetRequestArguments('http://www.google.com/recaptcha/api/verify', $arguments);
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$arguments['RequestMethod'] = 'POST';
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$arguments['PostValues'] = array(
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'privatekey'=>$this->private_key,
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'remoteip'=>GetEnv('REMOTE_ADDR'),
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'challenge'=>$form->GetInputValue($this->challenge),
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'response'=>$form->GetInputValue($this->response),
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);
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if(strlen($error = $http->Open($arguments)))
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return('recaptcha-not-reachable: '.$error);
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if(strlen($error = $http->SendRequest($arguments)) == 0)
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$error = $http->ReadWholeReplyBody($response);
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$http->Close();
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if(strlen($error))
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return('recaptcha-not-reachable: '.$error);
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$this->valid = !strcmp(strtok($response,"\n"), 'true');
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if(!$this->valid)
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{
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switch($error = strtok("\n"))
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{
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case 'incorrect-captcha-sol':
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break;
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case 'invalid-site-private-key':
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return($error.': the specified reCAPTCHA private key is incorrect');
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case 'invalid-request-cookie':
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return($error.': the reCAPTCHA challenge parameter is corrupted');
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case 'recaptcha-not-reachable':
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return($error.': it was not possible to access the reCAPTCHA server');
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default:
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return($error.': not yet supported reCAPTCHA error');
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}
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}
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return('');
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}
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Function ValidateInput(&$form)
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{
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return($this->valid ? '' : $this->validation_error_message);
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}
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Function AddInputPart(&$form)
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{
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if(strlen($error = $form->AddDataPart('<div id="'.HtmlSpecialChars($this->widget).'" style="display:none">'))
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|| ($error = parent::AddInputPart($form))
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|| ($error = $form->AddDataPart('</div><script type="text/javascript"><!--
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var RecaptchaOptions = {
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theme : "custom",
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custom_theme_widget: '.$form->EncodeJavaScriptString($this->widget).',
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custom_translations: {
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play_again: '.$form->EncodeJavaScriptString($this->text['play_again']).',
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cant_hear_this: '.$form->EncodeJavaScriptString($this->text['cant_hear_this']).',
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image_alt_text: '.$form->EncodeJavaScriptString($this->text['image_alt_text']).'
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}'.(strlen($this->tab_index) ? ',
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tabindex: '.$form->EncodeJavaScriptString($this->tab_index) : '').'
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};
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// --></script><script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k='.HtmlSpecialChars($this->key).'"></script><noscript><iframe src="http://www.google.com/recaptcha/api/noscript?k='.HtmlSpecialChars($this->key).'" height="300" width="500" frameborder="0"></iframe>'))
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|| strlen($error = $form->AddInputPart($this->challenge))
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|| strlen($error = $form->AddDataPart('<input type="hidden" name="'.HtmlSpecialChars($this->response).'" value="manual_challenge"></noscript>')))
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return($error);
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return('');
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}
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};
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?>
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