multi page form

function oauth_request_call(){
        
        $form['#multistep'] = TRUE;
  //drupal_set_message('<pre>'. print_r(&$form_state, TRUE) .'</pre>');
    $step = isset($form_state) ? $form_state['values']['step'] : 1;
    // store next strp in hidden field
    
    $form['step'] = array(
        '#type' => 'hidden',
        '#value' => $step + 1
    );
          
    drupal_set_message('<pre>'. print_r($step, TRUE) .'</pre>');        
  
    // indicator of step number
    $form['indicator'] = array(
        '#type' => 'fieldset',
        '#title' => t('Step @number', array('@number' => $step)),
    );
        switch($step){
                case 1:
        $form['indicator']['consumer'] = array(
                '#type' => 'fieldset',
                '#title' => t('consumer details'),
        );
        $form['indicator']['consumer']['consumer_key'] = array(
                '#title' => t('consumer key'),
                '#description' => t('consumer key of user on test server'),
                '#type' => 'textfield',
        );
        $form['indicator']['consumer']['consumer_secret'] = array(
                '#title' => t('consumer secret'),
                '#description' => t('consumer secret of user on test server'),
                '#type' => 'textfield',
        );
        $form['indicator']['endpoints'] = array(
                '#title' => t('end points of testing server'),
                '#type' => 'fieldset',
        );
        $form['indicator']['endpoints']['request_url'] = array(
                '#title' => t('Request URL'),
                '#type' => 'textfield',
                '#weight' => 5,
        );
        break;
        //$form_state['values']['step'] = 2;
        
        
 
 }
        if($step == 2) {
        drupal_set_message('<pre>'. print_r($result_request->data, TRUE) .'</pre>');    
        $form['indicator']['endpoints'] = array(
                '#title' => t('end points of testing server'),
                '#type' => 'fieldset',
        );
        $form['indicator']['endpoints']['auth_url'] = array(
                '#title' => t('Authentication URL'),
                '#type' => 'textfield',
                '#weight' => 6,
        );
        
        $form['indicator']['sig_method'] = array(
                '#title' => t('Please select signature method to use'),
                '#type' => 'radios',
                '#options' => array( 0 => t('HMAC-SHA1'), 1 => t('PLAINTEXT'), 2 => t('RSA-SHA1')),
                '#default_value' => 1,
        );
        $form['indicator']['token'] = array(
                '#type' => 'fieldset',
                '#title' => t('Token and Token secret'),
                '#description' => t('Paste Token and Token Secret from above which are obtained after request call'), 
        );
        $form['indicator']['token']['oauth_token'] = array(
                '#title' => t('OAuth token'), 
                '#description' => t('Please paste token from above which you obtain from request call'),
                '#type' => 'textfield',
                '#weight' => 12,
        );
        $form['indicator']['token']['oauth_token_secret'] = array(
                '#title' => t('OAuth token secret'), 
                '#description' => t('Please paste token secret from above which you obtain from request call'),
                '#type' => 'textfield',
                '#weight' => 13,
        );
        $form['auth_call'] = array(
                '#value' => t('OAuth Authentication Call'),
                '#type' => 'submit',
                '#weight' => 14,
        );
        
 }
        
        if($step == 3){
        $form['indicator']['endpoints']['access_url'] = array(
                '#title' => t('Access URL'),
                '#type' => 'textfield',
                '#weight' => 7,
        );
        $form['access_call'] = array(
                '#value' => t('OAuth Access Token Call'),
                '#type' => 'submit',
                '#weight' => 15,
        );
        
 }      
 
 $form['indicator']['request_call'] = array(
                '#value' => t('Request Token Call'),
                '#title' => t('Make call to server'),
                '#type' => 'submit',
                '#weight' => 10,
        );      
        switch($step){
                case 1:
                        $form_state['values']['step'] = 2;
                        break;
                case 2: 
                        $form['consumer_key'] = array(
                                '#type' => 'hidden',
                                '#value' => $form_values['consumer_key'],
                        );
                        $form['consumer_secret'] = array(
                                '#type' => 'hidden',
                                '#value' => $form_values['consumer_secret'],
                        );
                        $form['request_url'] = array(
                                '#type' => 'hidden',
                                '#value' => $form_values['request_url'],
                        );
                        break;
                
                }
 
        return $form;
        
}
 
function oauth_request_call_submit($form, &$form_state){
        
        $key = $form_state['values']['consumer_key'];
        $secret = $form_state['values']['consumer_secret'];
        $request_url = $form_state['values']['request_url'];
                
        if($form_state['values']['sig_method'] == 0){
          $user_sig_method = 'HMAC-SHA1';       
                }elseif($form_state['values']['sig_method'] == 1){
                        $user_sig_method = 'PLAINTEXT'; 
                  }elseif($form_state['values']['sig_method'] == 2){
                        $user_sig_method = 'RSA-SHA1';  
           }
        $test_token = NULL;
        
         
        if ($user_sig_method) {
       $sig_method = $sig_methods[$user_sig_method];
       print_r($sig_method);
        }
        
        
        $plaintext_method = new OAuthSignatureMethod_PLAINTEXT();
        //right now doing just for PLAINTEXT
        $sig_method = $plaintext_method;
        
        $token = $form_state['values']['oauth_token'];
    $token_secret = $form_state['values']['oauth_token_secret'];
    
    //drupal_set_message('<pre>'. print_r($sig_method, TRUE) .'</pre>');
        $test_consumer = new OAuthConsumer($key, $secret, NULL);
        
    
    if($form_state['values']['op'] == 'OAuth Authentication Call'){
        $test_token = new OAuthConsumer($token, $token_secret);
        //$callback_url = "$base_url/client.php?key=$key&secret=$secret&token=$token&token_secret=$token_secret&endpoint=" . urlencode($endpoint);
        $callback_url = "$base_url/?q=admin/oauth/services";
                $auth_url = $form_state['values']['auth_url'] . "/oauth_token=$token&oauth_callback=".urlencode($callback_url); 
        //$result_auth = drupal_http_request($auth_url, $headers = array(), $method = 'GET', $data = NULL, $retry = 3);
        //drupal_set_message('<pre>'. print_r($auth_url, TRUE) .'</pre>');
        drupal_redirect_form($form, $auth_url);
    }elseif($form_state['values']['op'] == 'OAuth Access Token Call'){
                //drupal_set_message('<pre>'. print_r($form_state['values']['access_url'], TRUE) .'</pre>');
                $test_token = new OAuthConsumer($form_state['values']['oauth_token'], $form_state['values']['oauth_token_secret']);
                $parsed = parse_url($form_state['values']['access_url']);
                        $params = array();
                        parse_str($parsed['query'], $params);
 
                        $acc_req = OAuthRequest::from_consumer_and_token($test_consumer, $test_token, "GET", $form_state['values']['access_url'], $params);
                        $acc_req->sign_request($sig_method, $test_consumer, $test_token);       
                $result_access = drupal_http_request($acc_req, $headers = array(), $method = 'GET', $data = NULL, $retry = 3);
                drupal_set_message('<pre>'. print_r($result_access->data, TRUE) .'</pre>');
                //drupal_redirect_form($form, $acc_req);
        }
    if($form_state['values']['op'] == 'Request Token Call'){
    $parsed = parse_url($request_url);
    $params = array();
    parse_str($parsed['query'], $params);
    //drupal_set_message('<pre>'. print_r($test_consumer, TRUE) .'</pre>');
    $req_req = OAuthRequest::from_consumer_and_token($test_consumer, NULL, "GET", $request_url, $params);
    $req_req->sign_request($sig_method, $test_consumer, NULL);
    //drupal_set_message('<pre>'. print_r($req_req, TRUE) .'</pre>');
    //drupal_redirect_form($form, $req_req);
    //Header("Location: $req_req");
    $result_request = drupal_http_request($req_req, $headers = array(), $method = 'GET', $data = NULL, $retry = 3);
    //drupal_set_message('<pre>'. print_r($form_state, TRUE) .'</pre>');
    return $result_request;
 }
    
 
}
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