function bp_avatar_ajax_upload() {
	if ( ! bp_is_post_request() ) {
		wp_die();
	}

	/**
	 * Sending the json response will be different if
	 * the current Plupload runtime is html4.
	 */
	$is_html4 = false;
	if ( ! empty( $_POST['html4' ] ) ) {
		$is_html4 = true;
	}

	// Check the nonce.
	check_admin_referer( 'bp-uploader' );

	// Init the BuddyPress parameters.
	$bp_params = array();

	// We need it to carry on.
	if ( ! empty( $_POST['bp_params' ] ) ) {
		$bp_params = $_POST['bp_params' ];
	} else {
		bp_attachments_json_response( false, $is_html4 );
	}

	// We need the object to set the uploads dir filter.
	if ( empty( $bp_params['object'] ) ) {
		bp_attachments_json_response( false, $is_html4 );
	}

	// Capability check.
	if ( ! bp_attachments_current_user_can( 'edit_avatar', $bp_params ) ) {
		bp_attachments_json_response( false, $is_html4 );
	}

	$bp = buddypress();
	$bp_params['upload_dir_filter'] = '';
	$needs_reset = array();

	if ( 'user' === $bp_params['object'] && bp_is_active( 'xprofile' ) ) {
		$bp_params['upload_dir_filter'] = 'xprofile_avatar_upload_dir';

		if ( ! bp_displayed_user_id() && ! empty( $bp_params['item_id'] ) ) {
			$needs_reset = array( 'key' => 'displayed_user', 'value' => $bp->displayed_user );
			$bp->displayed_user->id = $bp_params['item_id'];
		}
	} elseif ( 'group' === $bp_params['object'] && bp_is_active( 'groups' ) ) {
		$bp_params['upload_dir_filter'] = 'groups_avatar_upload_dir';

		if ( ! bp_get_current_group_id() && ! empty( $bp_params['item_id'] ) ) {
			$needs_reset = array( 'component' => 'groups', 'key' => 'current_group', 'value' => $bp->groups->current_group );
			$bp->groups->current_group = groups_get_group( $bp_params['item_id'] );
		}
	} else {
		/**
		 * Filter here to deal with other components.
		 *
		 * @since 2.3.0
		 *
		 * @var array $bp_params the BuddyPress Ajax parameters.
		 */
		$bp_params = apply_filters( 'bp_core_avatar_ajax_upload_params', $bp_params );
	}

	if ( ! isset( $bp->avatar_admin ) ) {
		$bp->avatar_admin = new stdClass();
	}

	/**
	 * The BuddyPress upload parameters is including the Avatar UI Available width,
	 * add it to the avatar_admin global for a later use.
	 */
	if ( isset( $bp_params['ui_available_width'] ) ) {
		$bp->avatar_admin->ui_available_width =  (int) $bp_params['ui_available_width'];
	}

	// Upload the avatar.
	$avatar = bp_core_avatar_handle_upload( $_FILES, $bp_params['upload_dir_filter'] );

	// Reset objects.
	if ( ! empty( $needs_reset ) ) {
		if ( ! empty( $needs_reset['component'] ) ) {
			$bp->{$needs_reset['component']}->{$needs_reset['key']} = $needs_reset['value'];
		} else {
			$bp->{$needs_reset['key']} = $needs_reset['value'];
		}
	}

	// Init the feedback message.
	$feedback_message = false;

	if ( ! empty( $bp->template_message ) ) {
		$feedback_message = $bp->template_message;

		// Remove template message.
		$bp->template_message      = false;
		$bp->template_message_type = false;

		@setcookie( 'bp-message', false, time() - 1000, COOKIEPATH, COOKIE_DOMAIN, is_ssl() );
		@setcookie( 'bp-message-type', false, time() - 1000, COOKIEPATH, COOKIE_DOMAIN, is_ssl() );
	}

	if ( empty( $avatar ) ) {
		// Default upload error.
		$message = __( 'Upload failed.', 'buddypress' );

		// Use the template message if set.
		if ( ! empty( $feedback_message ) ) {
			$message = $feedback_message;
		}

		// Upload error reply.
		bp_attachments_json_response( false, $is_html4, array(
			'type'    => 'upload_error',
			'message' => $message,
		) );
	}

	if ( empty( $bp->avatar_admin->image->file ) ) {
		bp_attachments_json_response( false, $is_html4 );
	}

	$uploaded_image = @getimagesize( $bp->avatar_admin->image->file );

	// Set the name of the file.
	$name = $_FILES['file']['name'];
	$name_parts = pathinfo( $name );
	$name = trim( substr( $name, 0, - ( 1 + strlen( $name_parts['extension'] ) ) ) );

	// Finally return the avatar to the editor.
	bp_attachments_json_response( true, $is_html4, array(
		'name'      => $name,
		'url'       => $bp->avatar_admin->image->url,
		'width'     => $uploaded_image[0],
		'height'    => $uploaded_image[1],
		'feedback'  => $feedback_message,
	) );
}