cacti/graph_json.php

<?php
/*
 +-------------------------------------------------------------------------+
 | Copyright (C) 2004-2016 The Cacti Group                                 |
 |                                                                         |
 | This program is free software; you can redistribute it and/or           |
 | modify it under the terms of the GNU General Public License             |
 | as published by the Free Software Foundation; either version 2          |
 | of the License, or (at your option) any later version.                  |
 |                                                                         |
 | This program is distributed in the hope that it will be useful,         |
 | but WITHOUT ANY WARRANTY; without even the implied warranty of          |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           |
 | GNU General Public License for more details.                            |
 +-------------------------------------------------------------------------+
 | Cacti: The Complete RRDTool-based Graphing Solution                     |
 +-------------------------------------------------------------------------+
 | This code is designed, written, and maintained by the Cacti Group. See  |
 | about.php and/or the AUTHORS file for specific developer information.   |
 +-------------------------------------------------------------------------+
 | http://www.cacti.net/                                                   |
 +-------------------------------------------------------------------------+
*/

/* since we'll have additional headers, tell php when to flush them */
ob_start();

$guest_account = true;
$gtype         = 'png';

include('./include/auth.php');
include_once('./lib/rrd.php');

api_plugin_hook_function('graph_image');

$debug = false;

if ($debug == false) {
	/* ================= input validation ================= */
	get_filter_request_var('graph_start');
	get_filter_request_var('graph_end');
	get_filter_request_var('graph_height');
	get_filter_request_var('graph_width');
	get_filter_request_var('local_graph_id');
	get_filter_request_var('rra_id');

	if (isset_request_var('graph_nolegend')) {
		set_request_var('graph_nolegend', 'true');
	}

	get_filter_request_var('graph_theme', FILTER_CALLBACK, array('options' => 'sanitize_search_string'));
	/* ==================================================== */
}else{
	set_request_var('graph_width', 700);
	set_request_var('graph_height', 200);
	set_request_var('title_font_size', 10);
	set_request_var('view_type', 'tree');
	set_request_var('graph_start', -1600);
	set_request_var('graph_end', 0);
	set_request_var('local_graph_id', 53);
	set_request_var('rra_id', 0);
}

/* flush the headers now */
ob_end_clean();

session_write_close();

$graph_data_array = array();

/* override: graph start time (unix time) */
if (!isempty_request_var('graph_start') && get_request_var('graph_start') < 1600000000) {
	$graph_data_array['graph_start'] = get_request_var('graph_start');
}

/* override: graph end time (unix time) */
if (!isempty_request_var('graph_end') && get_request_var('graph_end') < 1600000000) {
	$graph_data_array['graph_end'] = get_request_var('graph_end');
}

/* override: graph height (in pixels) */
if (!isempty_request_var('graph_height') && get_request_var('graph_height') < 3000) {
	$graph_data_array['graph_height'] = get_request_var('graph_height');
}

/* override: graph width (in pixels) */
if (!isempty_request_var('graph_width') && get_request_var('graph_width') < 3000) {
	$graph_data_array['graph_width'] = get_request_var('graph_width');
}

/* override: skip drawing the legend? */
if (!isempty_request_var('graph_nolegend')) {
	$graph_data_array['graph_nolegend'] = get_request_var('graph_nolegend');
}

/* print RRDTool graph source? */
if (!isempty_request_var('show_source')) {
	$graph_data_array['print_source'] = get_request_var('show_source');
}

/* disable cache check */
if (isset_request_var('disable_cache')) {
	$graph_data_array['disable_cache'] = true;
}

/* set the theme */
if (isset_request_var('graph_theme')) {
	$graph_data_array['graph_theme'] = get_request_var('graph_theme');
}

$graph_data_array['graphv'] = true;

// Determine the graph type of the output
if (!isset_request_var('image_format')) {
	$type   = db_fetch_cell('SELECT image_format_id FROM graph_templates_graph WHERE local_graph_id=' . get_request_var('local_graph_id'));
	switch($type) {
	case '1':
		$gtype = 'png';
		break;
	case '3':
		$gtype = 'svg+xml';
		break;
	default:
		$gtype = 'png';
		break;
	}
}else{
	switch(strtolower(get_nfilter_request_var('image_format'))) {
	case 'png':
		$graph_data_array['image_format'] = 'png';
		break;
	case 'svg':
		$gtype = 'svg+xml';
		break;
	default:
		$gtype = 'png';
		break;
	}
}

$graph_data_array['image_format'] = $gtype;

$output = @rrdtool_function_graph(get_request_var('local_graph_id'), (array_key_exists('rra_id', $_REQUEST) ? get_request_var('rra_id') : null), $graph_data_array);

$oarray = array('type' => $gtype, 'local_graph_id' => get_request_var('local_graph_id'), 'rra_id' => get_request_var('rra_id'));

// Check if we received back something populated from rrdtool
if ($output) {
	// Find the beginning of the image definition row
	$image_begin_pos  = strpos($output, "image = ");
	// Find the end of the line of the image definition row, after this the raw image data will come
	$image_data_pos   = strpos($output, "\n" , $image_begin_pos) + 1;
	// Insert the raw image data to the array
	$oarray['image']  = base64_encode(substr($output, $image_data_pos));
	
	// Parse and populate everything before the image definition row
	$header_lines     = explode("\n", substr($output, 0, $image_begin_pos - 1));
	foreach ($header_lines as $line) {
		$parts = explode(" = ", $line);
		$oarray[$parts[0]] = trim($parts[1]);
	}
} else { 
	// We most likely got back an empty image since the graph data doesn't exist yet, show a placeholder
	$oarray['image']  = base64_encode(file_get_contents(__DIR__."/images/rrd_not_found.png"));
}

print json_encode($oarray);