streaming_data.module

<?php
  function streaming_data_node_info()
  {
    return array(
      'frontend' => array(
        'name'        => t('Streaming server'),
        'base'        => 'streaming_data_frontend',
        'description' => t('A server that will broadcast video stream to users.'),
        'help'        => t('Stream-proxy instance that will request configuration.'),
        'has_title'   => true,
        'title_label' => t('Name'),
        'locked'      => true
      ),

      'channel' => array(
        'name'        => t('Channel'),
        'base'        => 'streaming_data_channel',
        'description' => t('A channel source.'),
        'help'        => t('URL where streaming server should get given channel.'),
        'has_title'   => true,
        'title_label' => t('Name'),
        'locked'      => true
      )
    );
  }

  function streaming_data_channel_validate($node, $form, &$form_state)
  {
    if (!empty($form_state['values']['streaming_url']['und'][0]['value']) &&
        !_streaming_data_is_unique('channel', 'streaming_url', $form_state['values']['streaming_url']['und'][0]['value'], $node->nid)) {
        form_set_error('streaming_url', t('URL already exists.'));
    }
  }

  function streaming_data_frontend_validate($node, $form, &$form_state)
  {
    if (!empty($form_state['values']['streaming_key']['und'][0]['value']) &&
        !_streaming_data_is_unique('frontend', 'streaming_key', $form_state['values']['streaming_key']['und'][0]['value'], $node->nid)) {
        form_set_error('streaming_key', t('Key already exists.'));
    }
  }

  function streaming_data_channel_form($node, &$form_state)
  {
    return node_content_form($node, $form_state);
  }

  function streaming_data_frontend_form($node, &$form_state)
  {
    $form = node_content_form($node, $form_state);
    //$form['#after_build'][] = 'streaming_data_set_key';
    return $form;
  }

  function streaming_data_frontend_form_alter($node, &$form_state, $form_id)
  {
    die('IN!!!');
  }

  function _streaming_data_is_unique($type, $field, $value, $except = null)
  {
    module_load_include('inc', 'streaming_data');

	$query = streaming_data_query($type);
	$query->fieldCondition($field, 'value', $value, '=');
	if ($except) {
	  $query->propertyCondition('nid', $except, '!=');
    }
    $query->count();

    return $query->execute() == 0;
  }

  function streaming_data_set_key($form, &$form_state)
  {
    do {
      $key = hash('sha256', uniqid() . time());
      $exists = db_query('SELECT COUNT(*) FROM {field_data_streaming_key} WHERE streaming_key_value = ?', array($key))->fetchColumn(0);
    } while($exists);

    $form['streaming_key']['und'][0]['value']['#value'] = $key;

    return $form;
  }