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   2. drupal7

Implementation of hook_file_download().

Ensure that user pictures (avatars) are always downloadable.

Code

modules/user/user.module, line 567

<?php
function user_file_download($file) {
  if (strpos($file, variable_get('user_picture_path', 'pictures') . '/picture-') === 0) {
    $info = image_get_info(file_create_path($file));
    return array('Content-type: ' . $info['mime_type']);
  }
}
?>