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web_server.m
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function [ out ] = web_server( action, varargin )
%WEB_SERVER Matlab/Octave web server.
%
% [ OUT ] = WEB_SERVER( ACTION, ARG ) Sets up and controls
% a web server in Matlab and Octave. ACTION specifies either
% START or STOP.
%
% The START action accepts the following ARG property/value pairs.
%
% Property Value/{Default} Description
% -----------------------------------------------------------------------------------
% timeout scalar/{500} Accept/read socket [ms] timeout limit.
% default_file string/{index.html} Default root html file
% www_folder string/{www} Webpage folder
% plotly bool/{true} Use plotly for plot rendering.
% fid scalar/{1} Output log file identifier.
% logfile string/{tempfile} Log file {[tempdir,eval_in_base_diary.log]}
% debug scalar/{0} Debug message level (0/1/2).
% Copyright 2013-2017 Precise Simulation, Ltd.
if( ~(nargin || nargout) ),help web_server, return, end
if( ischar(action) )
action = find(strncmpi( action, ...
{'start','stop'}, 4 ));
end
out = -1;
switch( action )
case 1 % Start.
cfg = web_configure( varargin{:} );
out = tcp_server( 'init', 'timeout', cfg.timeout );
if( out~=0 )
error( 'Could not start web server.' )
end
h_timer = timerfun( { @main_loop, cfg }, cfg.timeout/1000 );
if( isempty(h_timer) )
error( 'Could not start web server.' )
end
tcp = tcp_server();
fprintf( 1, '\nWeb server started on http://127.0.0.1:%i\n\n', tcp.port );
l_browser( ['http://127.0.0.1:',num2str(tcp.port)] );
case 2 % Stop.
out = tcp_server( 'close' );
h_timer = timerfun();
if( isempty(h_timer) && out==0 )
fprintf( 1, '\nWeb server stopped.\n\n' );
else
error( 'Could not stop web server.' )
end
otherwise
error( 'Unknown web server action/operation.' )
end
if( ~nargout )
clear out;
end
%------------------------------------------------------------------------------%
function main_loop( h_timer, tmp, cfg )
ier = tcp_server( 'accept' );
if( ier==-1 )
return
end
data = tcp_server( 'receive' );
if( isempty(data) )
return
end
if( cfg.debug>1 )
char( data )
end
% Convert the header text to a struct.
request = parse_request( data );
% The filename asked by the browser
if( isfield(request,'Get') )
filename = request.Get.Filename;
elseif( isfield(request,'Post') )
filename = request.Post.Filename;
else
warning( 'Unknown Type of Request' );
return
end
% Use default_file for root.
if( strcmp(filename,'/') )
filename = cfg.default_file;
end
fullfilename = fullfile( cfg.www_folder, filename );
[pathstr,name,ext] = fileparts( fullfilename );
% Check if file asked by the browser can be opened.
html = '';
found = exist( fullfilename )==2;
if( ~found )
fullfilename = fullfile( cfg.www_folder, '404.html' );
if( ~(exist( fullfilename )==2) )
html = '<html><body>404 File not found.</body></html>';
end
end
% Based on the extension asked, read a local file and
% parse it, or execute matlab code, which generates the file.
if( isempty(html) )
fid = fopen( fullfilename, 'r' );
html = fread( fid, inf, 'int8' )';
fclose( fid );
end
if( strcmp(ext,'.m') )
addpath( pathstr );
try
html = feval( name, request, cfg );
catch ME
html = [ '<html><body><font color="#FF0000">Error in file : ', name, ...
'.m</font><br><br><font color="#990000"> The file returned the following error: <br>', ...
ME.message, '</font></body></html>' ];
end
rmpath( pathstr );
end
response = get_response( html, found, ext );
% Send response and html to client.
tcp_server( 'write', int8(response) );
tcp_server( 'write', int8(html) );
%------------------------------------------------------------------------------%
function [ header ] = parse_request( requestdata )
request_text = char( requestdata );
request_lines = regexp( request_text, '[\n|\r|\r\n]+', 'split' );
request_words = regexp( request_lines, '\s+', 'split' );
for i=1:length( request_lines )
line = request_lines{i};
if( isempty(line) ), break; end
type = request_words{i}{1};
switch(lower(type))
case 'get'
header.Get.Filename = request_words{i}{2};
header.Get.Protocol = request_words{i}{3};
case 'post'
header.Post.Filename = request_words{i}{2};
header.Post.Protocol = request_words{i}{3};
case 'host:'
header.Host = strtrim(line(7:end));
case 'user-agent:'
header.UserAgent = strtrim(line(13:end));
case 'accept:'
header.Accept = strtrim(line(9:end));
case 'accept-language:'
header.AcceptLanguage = strtrim(line(18:end));
case 'accept-encoding:'
header.AcceptEncoding = strtrim(line(18:end));
case 'accept-charset:'
header.AcceptCharset = strtrim(line(17:end));
case 'keep-alive:'
header.KeepAlive = strtrim(line(13:end));
case 'connection:'
header.Connection = strtrim(line(13:end));
case 'content-length:'
header.ContentLength = strtrim(line(17:end));
case 'content-type:'
switch( strtrim(request_words{i}{2}) )
case {'application/x-www-form-urlencoded','application/x-www-form-urlencoded;'}
header.ContentType.Type = 'application/x-www-form-urlencoded';
header.ContentType.Boundary = '&';
case {'multipart/form-data','multipart/form-data;'}
header.ContentType.Type = 'multipart/form-data';
header.ContentType.Boundary = request_words{i}{3}(10:end);
otherwise
warning( 'Unhandled reqest content type.' )
end
otherwise
% warning( [ 'Unhandled reqest: ',type] )
end
end
header.Content = struct;
if( isfield(header,'ContentLength') )
cl = str2double(header.ContentLength);
str = request_text(end-cl+1:end);
data = requestdata(end-cl+1:end);
if( ~isfield(header,'ContentType') )
header.ContentType.Type = '';
header.ContentType.Boundary = '&';
end
switch(header.ContentType.Type )
case {'application/x-www-form-urlencoded',''}
words = regexp( strtrim(str), '&', 'split' );
for i=1:length(words)
words2 = regexp( words{i}, '=', 'split' );
header.Content.(words2{1}) = words2{2};
end
case 'multipart/form-data'
pos = strfind( str, header.ContentType.Boundary );
while( (pos(1)>1)&&(str(pos(1)-1)=='-') )
header.ContentType.Boundary = [ '-' header.ContentType.Boundary];
pos = strfind(str,header.ContentType.Boundary);
end
for i=1:(length(pos)-1)
pstart = pos(i)+length(header.ContentType.Boundary);
pend = pos(i+1)-3; % Remove "13 10" End-line characters.
subrequestdata = data(pstart:pend);
subdata = multipart2struct( subrequestdata, config );
header.Content.(subdata.Name).Filename = subdata.Filename;
header.Content.(subdata.Name).ContentType = subdata.ContentType;
header.Content.(subdata.Name).ContentData = subdata.ContentData;
end
otherwise
disp( 'Unknown request handling.' )
end
end
%------------------------------------------------------------------------------%
function [ response ] = get_response( html, found, ext )
header = header_commons( found );
switch( ext )
case {'.html','.htm','.css','.js','.m'}
header.XPoweredBY = [ 'Matlab', version ];
header.SetCookie = 'SESSID=5322082bf473207961031e3df1f45a22; path=/';
header.Expires = 'Thu, 19 Nov 1980 08:00:00 GMT';
header.CacheControl = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0';
header.Pragma = 'no-cache';
header.Connection = 'close';
header.ContentLength = num2str(length(html));
header.ContentType = 'text/html; charset=UTF-8';
if( strcmp(ext,'.css') )
header.ContentType = 'text/css; charset=UTF-8';
end
if( strcmp(ext,'.js') )
header.ContentType = 'text/js; charset=UTF-8';
end
otherwise
header.LastModified = 'Last-Modified: Thu, 21 Jun 2007 14:56:37 GMT';
header.AcceptRanges = 'Accept-Ranges: bytes';
header.ContentLength = num2str(length(html));
header.ETag = '"948921-15ae-c0dbf340"';
%header.KeepAlive = 'Keep-Alive: timeout=15, max=100';
header.ContentType = 'application/octet-stream';
end
if( any(strcmp(ext,{'.jpg','.png','.gif','.ico'})) )
header.ContentType = 'image/png';
end
response = header2text( header );
%------------------------------------------------------------------------------%
function [ header ] = header_commons( found )
if( found )
header.HTTP = '200 OK';
else
header.HTTP = '404 Not Found';
end
header.Date = datestr(now,'ddd, dd mmm yyyy HH:MM:SS');
if( exist( 'OCTAVE_VERSION', 'builtin' ) )
header.Server = 'Octave Web Server';
else
header.Server = 'Matlab Web Server';
end
%------------------------------------------------------------------------------%
function [ text ] = header2text( header )
text = '';
fn = fieldnames(header);
for i=1:length(fn)
name = fn{i};
data = header.(name);
switch name
case 'HTTP'
data = [ 'HTTP/1.0 ', data ];
case 'Date'
data = [ 'Date: ', data ];
case 'Server'
data = [ 'Server: ', data ];
case 'XPoweredBY'
data = [ 'X-Powered-By: ', data ];
case 'SetCookie'
data = [ 'Set-Cookie: ', data ];
case 'Expires'
data = [ 'Expires: ', data ];
case 'CacheControl'
data = [ 'Cache-Control: ', data ];
case 'Pragma'
data = [ 'Pragma: ', data ];
case 'XPingback'
data = [ 'X-Pingback: ', data ];
case 'Connection'
data = [ 'Connection: ', data ];
case 'ContentLength'
data = [ 'Content-Length: ' data];
case 'ContentType'
data = [ 'Content-Type: ', data ];
case 'LastModified'
data = [ 'Last-Modified: ', data ];
case 'AcceptRanges';
data = [ 'Accept-Ranges: ', data ];
case 'ETag';
data = [ 'ETag: ', data ];
case'KeepAlive';
data = [ 'Keep-Alive: ', data ];
otherwise
warning( 'Wrong header fieldname.' );
continue;
end
text=[ text, data, '\n' ];
end
text = [ text, '\n' ];
text = sprintf( text );
%------------------------------------------------------------------------------%
function [ subdata ] = multipart2struct( subrequestdata, config )
request_lines = regexp( char(subrequestdata), '\n+', 'split' );
request_words = regexp( request_lines, '\s+', 'split' );
i = 1;
subdata = struct;
subdata.Name = '';
subdata.Filename = '';
subdata.ContentType = '';
subdata.ContentData = '';
while( true )
i = i+1;
if((i>length(request_lines))||(uint8(request_lines{i}(1)==13))), break; end
line = request_lines{i};
type = request_words{i}{1};
switch( type )
case 'Content-Disposition:'
for j=3:length(request_words{i})
line_words = regexp( request_words{i}{j}, '"', 'split' );
switch( line_words{1} )
case 'name='
subdata.Name = line_words{2};
case 'filename='
subdata.Filename = line_words{2};
end
end
case 'Content-Type:'
subdata.ContentType = strtrim(line(15:end));
end
end
w =find(subrequestdata==10);
switch( subdata.ContentType )
case ''
subdata.ContentData = char(subrequestdata(w(i)+1:end));
otherwise
subdata.ContentData = subrequestdata(w(i)+1:end);
[pathstr,name,ext] = fileparts(subdata.Filename);
filename = [ '/', char(round(rand(1,32)*9)+48) ];
fullfilename = [ tempdir, filename, ext ];
fid = fopen(fullfilename,'w');
fwrite(fid,subdata.ContentData,'int8');
fclose(fid);
subdata.Filename = fullfilename;
end
%------------------------------------------------------------------------------%
function [ cfg ] = web_configure( varargin )
% Setup and parse input parameters.
% Default parameters.
cfg.timeout = 500;
cfg.default_file = 'index.html';
cfg.www_folder = 'www';
cfg.logfile = fullfile( tempdir, ['eval_in_base_diary_',l_get_uid(10),'.log'] );
cfg.plotly = true;
cfg.debug = 0;
cfg.octave = exist( 'OCTAVE_VERSION', 'builtin' );
if( exist(cfg.logfile)==2 )
try
delete( logfile );
catch
end
end
% Parse configuration.
config = varargin;
if( ~isempty(config) )
if( iscell(config) )
config = cell2struct( config(2:2:end), config(1:2:end-1), 2 );
end
fields = fieldnames(config);
for i=1:length(fields)
cfg.(fields{i}) = config.(fields{i});
end
end
if( exist(cfg.logfile)==2 )
try
delete( cfg.logfile );
catch
end
end
try
if( cfg.plotly )
addpath( genpath('lib/plotly') );
end
catch
cfg.plotly = false;
end
%-------------------------------------------------------------------------%
function [ s_uid, uid ] = l_get_uid( n )
% Unique (random) user id.
uid = zeros(1,n);
ix = (uid>=48&uid<=57) | (uid>=65&uid<=90) | (uid>=97&uid<=122);
while( ~all(ix) )
ix = (uid>=48&uid<=57) | (uid>=65&uid<=90) | (uid>=97&uid<=122);
uid(~ix) = randi( 122, 1, sum(~ix) );
end
s_uid = char(uid);
%------------------------------------------------------------------------------%
function [ stat ] = l_browser( addr )
% Open web address in default web browser.
try
if( ~exist( 'OCTAVE_VERSION', 'builtin' ) )
stat = web( addr, '-browser' );
else
if( ispc )
stat = dos( ['cmd.exe /c rundll32 url.dll,FileProtocolHandler "',addr,'"'] );
elseif( isunix )
try
status = unix( ['xdg-open ',addr] );
catch
status = unix( ['gnome-open ',addr] );
end
elseif( ismac )
unix( ['open ',addr] );
end
end
catch
stat = -1;
end
if( stat~=0 )
warning(['Failed to automatically open browser, please manually open:',char(10),char(10),addr,char(10)])
end
%------------------------------------------------------------------------------%
function [ h_out ] = timerfun( cbf, delay )
%TIMERFUN Create single timer function.
%
% [ H ] = TIMERFUN( CBF, DELAY ) Creates a single timer function
% with persistent handle H. If a timer function is not already
% present a new object is created with the callback CBF which is
% called every DELAY seconds (CBF can be a cell array of a function
% handle and following input arguments). A call with an existing
% timer object stops and deletes it.
%
% See also TIMER.
persistent h
is_debug = false;
if( nargin<2 )
delay = 3;
end
if( nargin && ~iscell(cbf) )
cbf = { cbf };
end
if( isempty(h) )
action = 'start';
else
action = 'stop';
end
switch( lower(action) )
case 'start'
if( is_debug )
fprintf( 'Starting timer function %s with delay %g s. \n', func2str(cbf{1}), delay )
end
if( ~isempty(h) )
warning('timerfun: closing existing timer function.')
try
delete( h )
catch
end
end
h = add_timer( delay, cbf );
case 'stop'
if( is_debug )
fprintf( 'Stopping timer function.\n\n' )
end
if( exist( 'OCTAVE_VERSION', 'builtin' ) )
remove_input_event_hook( h );
else
stop( h )
delete( h )
end
h = [];
end
if( nargout )
h_out = h;
end
%-------------------------------------------------------------------------%
function [ h ] = add_timer( delay, cbf )
if( exist( 'OCTAVE_VERSION', 'builtin' ) )
h = add_input_event_hook( @cbf_timer, { cbf delay } );
else
h = timer( 'TimerFcn', cbf, 'ExecutionMode', 'fixedSpacing', ...
'Period', delay );
start( h );
end
%-------------------------------------------------------------------------%
function cbf_timer( data )
persistent last_time
if( isempty(last_time) )
last_time = 0;
end
cbf = data{1};
delay = data{2};
current_time = clock();
current_time = sum(current_time(4:6).*[60*60 60 1]);
if( (current_time-last_time)>=delay )
args = cbf(2:end);
cbf = cbf{1};
cbf( [], [], args{:} )
fflush( stdout );
last_time = current_time;
end