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gpsd.php.in
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gpsd.php.in
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<?php
# Copyright (c) 2006,2010 Chris Kuethe <[email protected]>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
global $head, $blurb, $title, $showmap, $autorefresh, $footer, $gmap_key;
global $server, $advertise, $port, $open, $swap_ew, $testmode;
$testmode = 1; # leave this set to 1
# Public script parameters:
# host: host name or address where GPSd runs. Default: from config file
# port: port of GPSd. Default: from config file
# op=view: show just the skyview image instead of the whole HTML page
# sz=small: used with op=view, display a small (240x240px) skyview
# op=json: respond with the GPSd POLL JSON structure
# jsonp=prefix: used with op=json, wrap the POLL JSON in parentheses
# and prepend prefix
# If you're running PHP with the Suhosin patch (like the Debian PHP5 package),
# it may be necessary to increase the value of the
# suhosin.get.max_value_length parameter to 2048. The imgdata parameter used
# for displaying the skyview is longer than the default 512 allowed by Suhosin.
# Debian has the config file at /etc/php5/conf.d/suhosin.ini.
# this script shouldn't take more than a few seconds to run
set_time_limit(3);
ini_set('max_execution_time', 3);
if (!file_exists("gpsd_config.inc"))
write_config();
require_once("gpsd_config.inc");
# sample data
$resp = <<<EOF
{"class":"POLL","time":"2010-04-05T21:27:54.84Z","active":1,
"tpv":[{"class":"TPV","tag":"MID41","device":"/dev/ttyUSB0",
"time":1270517264.240,"ept":0.005,"lat":40.035093060,
"lon":-75.519748733,"alt":31.1,"track":99.4319,
"speed":0.123,"mode":3}],
"sky":[{"class":"SKY","tag":"MID41","device":"/dev/ttyUSB0",
"time":"2010-04-05T21:27:44.84Z","hdop":9.20,"vdop":12.1,
"satellites":[{"PRN":16,"el":55,"az":42,"ss":36,"used":true},
{"PRN":19,"el":25,"az":177,"ss":0,"used":false},
{"PRN":7,"el":13,"az":295,"ss":0,"used":false},
{"PRN":6,"el":56,"az":135,"ss":32,"used":true},
{"PRN":13,"el":47,"az":304,"ss":0,"used":false},
{"PRN":23,"el":66,"az":259,"ss":40,"used":true},
{"PRN":20,"el":7,"az":226,"ss":0,"used":false},
{"PRN":3,"el":52,"az":163,"ss":32,"used":true},
{"PRN":31,"el":16,"az":102,"ss":0,"used":false}
]
}
]
}
EOF;
# if we're passing in a query, let's unpack and use it
$op = isset($_GET['op']) ? $_GET['op'] : '';
if (isset($_GET['imgdata']) && $op == 'view'){
$resp = base64_decode($_GET['imgdata']);
if ($resp){
gen_image($resp);
exit(0);
}
} else {
if (isset($_GET['host']))
if (!preg_match('/[^a-zA-Z0-9\.-]/', $_GET['host']))
$server = $_GET['host'];
if (isset($_GET['port']))
if (!preg_match('/\D/', $_GET['port']) && ($port>0) && ($port<65536))
$port = $_GET['port'];
if ($testmode){
$sock = @fsockopen($server, $port, $errno, $errstr, 2);
@fwrite($sock, "?WATCH={\"enable\":true}\n");
usleep(1000);
@fwrite($sock, "?POLL;\n");
usleep(1000);
for($tries = 0; $tries < 10; $tries++){
$resp = @fread($sock, 2000); # SKY can be pretty big
if (preg_match('/{"class":"POLL".+}/i', $resp, $m)){
$resp = $m[0];
break;
}
}
@fclose($sock);
if (!$resp)
$resp = '{"class":"ERROR","message":"no response from GPS daemon"}';
}
}
if ($op == 'view')
gen_image($resp);
else if ($op == 'json')
write_json($resp);
else
write_html($resp);
exit(0);
###########################################################################
function colorsetup($im){
$C['white'] = imageColorAllocate($im, 255, 255, 255);
$C['ltgray'] = imageColorAllocate($im, 191, 191, 191);
$C['mdgray'] = imageColorAllocate($im, 127, 127, 127);
$C['dkgray'] = imageColorAllocate($im, 63, 63, 63);
$C['black'] = imageColorAllocate($im, 0, 0, 0);
$C['red'] = imageColorAllocate($im, 255, 0, 0);
$C['brightgreen'] = imageColorAllocate($im, 0, 255, 0);
$C['darkgreen'] = imageColorAllocate($im, 0, 192, 0);
$C['blue'] = imageColorAllocate($im, 0, 0, 255);
$C['cyan'] = imageColorAllocate($im, 0, 255, 255);
$C['magenta'] = imageColorAllocate($im, 255, 0, 255);
$C['yellow'] = imageColorAllocate($im, 255, 255, 0);
$C['orange'] = imageColorAllocate($im, 255, 128, 0);
return $C;
}
function legend($im, $sz, $C){
$r = 30;
$fn = 5;
$x = $sz - (4*$r+7) - 2;
$y = $sz - $r - 3;
imageFilledRectangle($im, $x, $y, $x + 4*$r + 7, $y + $r +1, $C['dkgray']);
imageRectangle($im, $x+0*$r+1, $y+1, $x + 1*$r + 0, $y + $r, $C['red']);
imageRectangle($im, $x+1*$r+2, $y+1, $x + 2*$r + 2, $y + $r, $C['yellow']);
imageRectangle($im, $x+2*$r+4, $y+1, $x + 3*$r + 4, $y + $r, $C['darkgreen']);
imageRectangle($im, $x+4*$r+6, $y+1, $x + 3*$r + 6, $y + $r, $C['brightgreen']);
imageString($im, $fn, $x+3+0*$r, $y+$r/3, "<30", $C['red']);
imageString($im, $fn, $x+5+1*$r, $y+$r/3, "30+", $C['yellow']);
imageString($im, $fn, $x+7+2*$r, $y+$r/3, "35+", $C['darkgreen']);
imageString($im, $fn, $x+9+3*$r, $y+$r/3, "40+", $C['brightgreen']);
}
function radial($angle, $sz){
#turn into radians
$angle = deg2rad($angle);
# determine length of radius
$r = $sz * 0.5 * 0.95;
# and convert length/azimuth to cartesian
$x0 = sprintf("%d", (($sz * 0.5) - ($r * cos($angle))));
$y0 = sprintf("%d", (($sz * 0.5) - ($r * sin($angle))));
$x1 = sprintf("%d", (($sz * 0.5) + ($r * cos($angle))));
$y1 = sprintf("%d", (($sz * 0.5) + ($r * sin($angle))));
return array($x0, $y0, $x1, $y1);
}
function azel2xy($az, $el, $sz){
global $swap_ew;
#rotate coords... 90deg W = 180deg trig
$az += 270;
#turn into radians
$az = deg2rad($az);
# determine length of radius
$r = $sz * 0.5 * 0.95;
$r -= ($r * ($el/90));
# and convert length/azimuth to cartesian
$x = sprintf("%d", (($sz * 0.5) + ($r * cos($az))));
$y = sprintf("%d", (($sz * 0.5) + ($r * sin($az))));
if ($swap_ew == 0)
$x = $sz - $x;
return array($x, $y);
}
function splot($im, $sz, $C, $e){
if ((0 == $e['PRN']) || (0 == $e['az'] + $e['el'] + $e['ss']) ||
($e['az'] < 0) || ($e['el'] < 0))
return;
$color = $C['brightgreen'];
if ($e['ss'] < 40)
$color = $C['darkgreen'];
if ($e['ss'] < 35)
$color = $C['yellow'];
if ($e['ss'] < 30)
$color = $C['red'];
if ($e['el']<10)
$color = $C['blue'];
if ($e['ss'] < 10)
$color = $C['black'];
list($x, $y) = azel2xy($e['az'], $e['el'], $sz);
$r = 12;
if (isset($_GET['sz']) && ($_GET['sz'] == 'small'))
$r = 8;
imageString($im, 3, $x+4, $y+4, $e['PRN'], $C['black']);
if ($e['used'] == true)
if ($e['PRN'] > 32)
imageFilledDiamond($im, $x, $y, $r, $color);
else
imageFilledArc($im, $x, $y, $r, $r, 0, 360, $color, 0);
else
if ($e['PRN'] > 32)
imageDiamond($im, $x, $y, $r, $color);
else
imageArc($im, $x, $y, $r, $r, 0, 360, $color);
}
function imageDiamond($im, $x, $y, $r, $color){
$t = $r/2;
# this lunacy is because imagesetthickness doesn't seem to work
$vx = array ( $x+$t, $y, $x, $y+$t, $x-$t, $y, $x, $y-$t );
imagepolygon($im, $vx, 4, $color);
$t--;
$vx = array ( $x+$t, $y, $x, $y+$t, $x-$t, $y, $x, $y-$t );
imagepolygon($im, $vx, 4, $color);
$t--;
$vx = array ( $x+$t, $y, $x, $y+$t, $x-$t, $y, $x, $y-$t );
imagepolygon($im, $vx, 4, $color);
}
function imageFilledDiamond($im, $x, $y, $r, $color){
$t = $r/2;
while($t){
$vx = array ( $x+$t, $y, $x, $y+$t, $x-$t, $y, $x, $y-$t );
imagepolygon($im, $vx, 4, $color);
$t -= 0.5;
}
}
function elevation($im, $sz, $C, $a){
$b = 90 - $a;
$a = $sz * 0.95 * ($a/180);
imageArc($im, $sz/2, $sz/2, $a*2, $a*2, 0, 360, $C['ltgray']);
$x = $sz/2 - 16;
$y = $sz/2 - $a;
imageString($im, 2, $x, $y, $b, $C['ltgray']);
}
function skyview($im, $sz, $C){
global $swap_ew;
$a = 90; $a = $sz * 0.95 * ($a/180);
imageFilledArc($im, $sz/2, $sz/2, $a*2, $a*2, 0, 360, $C['mdgray'], 0);
imageArc($im, $sz/2, $sz/2, $a*2, $a*2, 0, 360, $C['black']);
$x = $sz/2 - 16; $y = $sz/2 - $a;
imageString($im, 2, $x, $y, "0", $C['ltgray']);
$a = 85; $a = $sz * 0.95 * ($a/180);
imageFilledArc($im, $sz/2, $sz/2, $a*2, $a*2, 0, 360, $C['white'], 0);
imageArc($im, $sz/2, $sz/2, $a*2, $a*2, 0, 360, $C['ltgray']);
imageString($im, 1, $sz/2 - 6, $sz+$a, '5', $C['black']);
$x = $sz/2 - 16; $y = $sz/2 - $a;
imageString($im, 2, $x, $y, "5", $C['ltgray']);
for($i = 0; $i < 180; $i += 15){
list($x0, $y0, $x1, $y1) = radial($i, $sz);
imageLine($im, $x0, $y0, $x1, $y1, $C['ltgray']);
}
for($i = 15; $i < 90; $i += 15)
elevation($im, $sz, $C, $i);
$x = $sz/2 - 16; $y = $sz/2 - 8;
/* imageString($im, 2, $x, $y, "90", $C['ltgray']); */
imageString($im, 4, $sz/2 + 4, 2 , 'N', $C['black']);
imageString($im, 4, $sz/2 + 4, $sz - 16 , 'S', $C['black']);
if ($swap_ew == 0){
imageString($im, 4, 4 , $sz/2 + 4, 'E', $C['black']);
imageString($im, 4, $sz - 10 , $sz/2 + 4, 'W', $C['black']);
} else {
imageString($im, 4, 4 , $sz/2 + 4, 'W', $C['black']);
imageString($im, 4, $sz - 10 , $sz/2 + 4, 'E', $C['black']);
}
}
function gen_image($resp){
$sz = 600;
if (isset($_GET['sz']) && ($_GET['sz'] == 'small'))
$sz = 240;
$GPS = json_decode($resp, true);
if ($GPS['class'] != "POLL"){
die("json_decode error: $resp");
}
$im = imageCreate($sz, $sz);
$C = colorsetup($im);
skyview($im, $sz, $C);
if ($sz > 240)
legend($im, $sz, $C);
for($i = 0; $i < count($GPS['sky'][0]['satellites']); $i++){
splot($im, $sz, $C, $GPS['sky'][0]['satellites'][$i]);
}
header("Content-type: image/png");
imagePNG($im);
imageDestroy($im);
}
function dfix($x, $y, $z){
if ($x < 0){
$x = sprintf("%f %s", -1 * $x, $z);
} else {
$x = sprintf("%f %s", $x, $y);
}
return $x;
}
function write_html($resp){
global $sock, $errstr, $errno, $server, $port, $head, $body, $open;
global $blurb, $title, $autorefresh, $showmap, $gmap_key, $footer;
global $testmode, $advertise;
$GPS = json_decode($resp, true);
if ($GPS['class'] != 'POLL'){
die("json_decode error: $resp");
}
header("Content-type: text/html; charset=UTF-8");
global $lat, $lon;
$lat = (float)$GPS['tpv'][0]['lat'];
$lon = (float)$GPS['tpv'][0]['lon'];
$x = $server; $y = $port;
$imgdata = base64_encode($resp);
$server = $x; $port = $y;
if ($autorefresh > 0)
$autorefresh = "<meta http-equiv='Refresh' content='$autorefresh'/>";
else
$autorefresh = '';
$map_head = $map_body = $map_code = '';
if ($showmap == 1) {
$map_head = gen_gmap_head();
$map_body = 'onload="Load()" onunload="GUnload()"';
$map_code = gen_map_code();
} else if ($showmap == 2) {
$map_head = gen_osm_head();
$map_body = 'onload="Load()"';
$map_code = gen_map_code();
}
$part1 = <<<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
{$head}
{$map_head}
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta http-equiv="Content-Language" content="en,en-us"/>
<title>{$title} - GPSD Test Station {$lat}, {$lon}</title>
{$autorefresh}
<style>
.warning {
color: #FF0000;
}
.fixed {
font-family: mono-space;
}
.caption {
text-align: left;
margin: 1ex 3em 1ex 3em; /* top right bottom left */
}
.administrivia {
font-size: small;
font-family: verdana, sans-serif;
}
</style>
</head>
<body {$body} {$map_body}>
<center>
<table border="0">
<tr><td align="justify">
{$blurb}
</td>
EOF;
if (!strlen($advertise))
$advertise = $server;
if ($testmode && !$sock)
$part2 = "";
else
$part2 = <<<EOF
<!-- ------------------------------------------------------------ -->
<td rowspan="4" align="center" valign="top">
<img src="?op=view&imgdata={$imgdata}"
width="600" height="600"/>
<br clear="all"/>
<p class="caption">A filled circle means the satellite was used in
the last fix. Green-yellow-red colors indicate signal strength in dB,
green=most and red=least. Diamonds indicate SBAS satellites.</p>
{$map_code}</td>
</tr>
EOF;
if (!$open)
$part3 = '';
else
$part3 = <<<EOF
<!-- ------------------------------------------------------------ -->
<tr><td align="justify">To get real-time information, connect to
<span class="fixed">telnet://{$advertise}:{$port}/</span> and type "?POLL;"
or "?WATCH={"enable":true,"raw":true}".<br/>
Use a different server:<br/>
<form method=GET action="${_SERVER['SCRIPT_NAME']}">
<input name="host" value="{$advertise}">:
<input name="port" value="{$port}" size="5" maxlength="5">
<input type=submit value="Get Position"><input type=reset></form>
<br/>
</td>
</tr>
EOF;
if ($testmode && !$sock)
$part4 = "<tr><td class='warning'>The gpsd instance that this page monitors is not running.</td></tr>";
else {
$fix = $GPS['tpv'][0];
$sky = $GPS['sky'][0];
$sats = $sky['satellites'];
$nsv = count($sats);
$ts = $fix['time'];
$sat = '';
foreach($sats as $s)
$sat .= sprintf(
"\t<tr><td>%d</td><td>%d</td><td>%d</td><td>%d</td><td>%s</td></tr>\n",
$s['PRN'], $s['el'], $s['az'], $s['ss'], $s['used'] ? 'Y' : 'N'
);
$part4 = <<<EOF
<!-- ------------------------------------------------------------ -->
<tr><td align=center valign=top>
<table border=1>
<tr><th colspan=2 align=center>Current Information</th></tr>
<tr><td>Time (UTC)</td><td>{$ts}</td></tr>
<tr><td>Latitude</td><td>{$fix['lat']}</td></tr>
<tr><td>Longitude</td><td>{$fix['lon']}</td></tr>
<tr><td>Altitude</td><td>{$fix['alt']}</td></tr>
<tr><td>Fix Type</td><td>{$fix['mode']}</td></tr>
<tr><td>Satellites</td><td>{$nsv}</td></tr>
<tr><td>HDOP</td><td>{$sky['hdop']}</td></tr>
<tr><td>VDOP</td><td>{$sky['vdop']}</td></tr>
</table>
<br/>
<table border=1>
<tr><th colspan=5 align=center>Current Satellites</th></tr>
<tr><th>PRN</th><th>Elevation</th><th>Azimuth</th><th>SS</th><th>Used</th></tr>
$sat </table>
</td></tr>
<!-- raw response:
{$resp}
-->
EOF;
}
$part5 = <<<EOF
</table>
</center>
{$footer}
<hr/>
<p class="administrivia">This script is distributed by the
<a href="@WEBSITE@">GPSD project</a>.</p>
</body>
</html>
EOF;
print $part1 . $part2 . $part3 . $part4 . $part5;
}
function write_json($resp){
header('Content-Type: text/javascript');
if (isset($_GET['jsonp']))
print "{$_GET['jsonp']}({$resp})";
else
print $resp;
}
function write_config(){
$f = fopen("gpsd_config.inc", "a");
if (!$f)
die("can't generate prototype config file. try running this script as root in DOCUMENT_ROOT");
$buf = <<<EOB
<?PHP
\$title = 'My GPS Server';
\$server = 'localhost';
#\$advertise = 'localhost';
\$port = 2947;
\$autorefresh = 0; # number of seconds after which to refresh
\$showmap = 0; # set to 1 if you want to have a google map, set it to 2 if you want a map based on openstreetmap
\$gmap_key = 'GetYourOwnGoogleKey'; # your google API key goes here
\$swap_ew = 0; # set to 1 if you don't understand projections
\$open = 0; # set to 1 to show the form to change the GPSd server
## You can read the header, footer and blurb from a file...
# \$head = file_get_contents('/path/to/header.inc');
# \$body = file_get_contents('/path/to/body.inc');
# \$footer = file_get_contents('/path/to/footer.hinc');
# \$blurb = file_get_contents('/path/to/blurb.inc');
## ... or you can just define them here
\$head = '';
\$body = '';
\$footer = '';
\$blurb = <<<EOT
This is a
<a href="@WEBSITE@">gpsd</a>
server <blink><font color="red">located someplace</font></blink>.
The hardware is a
<blink><font color="red">hardware description and link</font></blink>.
This machine is maintained by
<a href="mailto:[email protected]">Your Name Goes Here</a>.<br/>
EOT;
?>
EOB;
fwrite($f, $buf);
fclose($f);
}
function gen_gmap_head() {
global $gmap_key;
return <<<EOT
<script src="http://maps.google.com/maps?file=api&v=2&key={$gmap_key}" type="text/javascript"></script>
<script type="text/javascript">
<!--
// Create a base icon for all of our markers that specifies the shadow, icon
// dimensions, etc.
function Load() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
var point = new GLatLng( {$GLOBALS['lat']}, {$GLOBALS['lon']} );
map.setCenter( point, 14);
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
var baseIcon = new GIcon();
baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
baseIcon.iconSize = new GSize(20, 34);
baseIcon.shadowSize = new GSize(37, 34);
baseIcon.iconAnchor = new GPoint(9, 34);
baseIcon.infoWindowAnchor = new GPoint(9, 2);
baseIcon.infoShadowAnchor = new GPoint(18, 25);
var icon = new GIcon(baseIcon);
icon.image = "http://www.google.com/mapfiles/marker.png";
var marker = new GMarker(point, icon);
map.addOverlay(marker);
}
}
-->
</script>
EOT;
}
function gen_osm_head() {
global $GPS;
return <<<EOT
<script src="http://openlayers.org/api/OpenLayers.js" type="text/javascript"></script>
<script type="text/javascript">
<!--
function Load() {
document.getElementById("map").firstChild.data = "";
var map = new OpenLayers.Map("map", {
controls: [
new OpenLayers.Control.Navigation(),
new OpenLayers.Control.PanZoomBar(),
new OpenLayers.Control.ScaleLine(),
new OpenLayers.Control.LayerSwitcher()
]
});
var layer = new OpenLayers.Layer.OSM("Open Street Map");
map.addLayer(layer);
var center = new OpenLayers.LonLat({$GLOBALS['lon']}, {$GLOBALS['lat']})
.transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());
map.setCenter(center, 12);
var markers = new OpenLayers.Layer.Markers("Markers");
markers.addMarker(new OpenLayers.Marker(center));
map.addLayer(markers);
}
-->
</script>
EOT;
}
function gen_map_code() {
return <<<EOT
<br/>
<div id="map" style="width: 550px; height: 400px; border:1px; border-style: solid;">
Loading...
<noscript>
<span class='warning'>Sorry: you must enable javascript to view our maps.</span><br/>
</noscript>
</div>
EOT;
}
?>