-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.js
140 lines (134 loc) · 4.72 KB
/
server.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
var fs = require('fs'),
execFile = require('child_process').execFile,
express = require('express'),
request = require('request'),
_ = require('underscore'),
temp = require('temp'),
config = require('./config'),
app = express(),
basePath = config.basePath,
convertArguments = config.convertCommand.split(/\s+/),
convertCommand = convertArguments.shift(),
port = config.port;
if (config.proxy) {
console.log('using proxy', config.proxy);
request = request.defaults({proxy: config.proxy});
}
app.use(express.logger());
app.get(/^(\/.+)\.([^.\/]+)(\.jpe?g)$/i, function (req, res) {
var convertOptions = getConvertOptions(req.params[1]),
relativePath = req.params[0] + req.params[2],
source = basePath + relativePath,
times = {start: Date.now()},
r;
if (!convertOptions) {
res.send(400);
return;
}
r = request(source);
r.on('response', function (remoteRes) {
var maxAge, m, rawFile, convertedFile, stream;
if (remoteRes.statusCode === 200) {
if (m = remoteRes.headers['cache-control'] && remoteRes.headers['cache-control'].match(/\bmax-age=(\d+)\b/)) {
maxAge = m[1];
}
else {
maxAge = config.maxAge;
}
rawFile = getTempFilename('raw');
convertedFile = getTempFilename('converted');
r.pipe(fs.createWriteStream(rawFile))
.on('error', function (err) {
console.log('stream error', err);
res.send(500);
cleanup();
})
.on('finish', function () {
var args = convertArguments.concat(rawFile, convertOptions, convertedFile);
times.downloaded = Date.now();
console.log('%s written', rawFile);
console.log(convertCommand, args.join(' '));
execFile(convertCommand, args, function (err, stdout, stderr) {
if (err) {
console.log('convert error', err, stderr);
res.send(500);
cleanup();
return;
}
times.converted = Date.now();
console.log('sending converted file with max age', maxAge);
// sendfile() wants maxAge in milliseconds, not seconds:
res.sendfile(convertedFile, {maxAge: maxAge * 1000}, function () {
var prevTime;
times.sent = Date.now();
_.each(times, function (t, name) {
if (prevTime) {
console.log('%s: %d', name, t - prevTime);
}
prevTime = t;
});
cleanup();
});
});
});
}
else {
console.log('HTTP error', remoteRes.statusCode);
res.send(404);
}
function cleanup() {
console.log('deleting', rawFile);
fs.unlink(rawFile);
if (convertedFile) {
console.log('deleting', convertedFile);
fs.unlink(convertedFile);
}
}
});
r.on('error', function (err) {
console.log('request error', err);
res.send(500);
});
});
function getConvertOptions(optionsString) {
var params = {w: '', h: ''},
options = [],
m;
while (m = optionsString.match(/^([whr])(\d+)|^(c)(\d+x\d+\+\d+\+\d+)/)) {
if (m[1]) {
params[m[1]] = m[2];
}
else {
params[m[3]] = m[4];
}
optionsString = optionsString.substr(m[0].length);
}
if (optionsString) {
return null;
}
// Order of handling is important here
if (params.c) {
options.push('-crop', params.c);
}
if (params.r) {
options.push('-rotate', params.r);
}
if (params.w || params.h) {
options.push('-resize', params.w + 'x' + params.h);
}
return options;
}
function getTempFilename(options) {
if (typeof options == 'string') {
options = {prefix: 'thumbnail-' + options + '-'};
}
_.defaults(options, {dir: config.tempDir, suffix: '.jpg'});
return temp.path(options);
}
app.listen(port);
console.log('listening on port', port);
if (process.getuid() === 0) {
// If run as root (to use privileged port) then change to less privileged user
process.setgid(config.group);
process.setuid(config.user);
}