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const zlib = require('zlib');
const util = require('util');
const os = require('os');
const { spawn } = require('child_process');
const HttpDuplex = require('./http-duplex');
const headerRE = {
'receive-pack': '([0-9a-fA-F]+) ([0-9a-fA-F]+) refs\/(heads|tags)\/(.*?)( |00|\u0000)|^(0000)$', // eslint-disable-line
'upload-pack': '^\\S+ ([0-9a-fA-F]+)'
};
const packSideband = s => {
const n = (4 + s.length).toString(16);
return Array(4 - n.length + 1).join('0') + n + s;
};
class Service extends HttpDuplex {
/**
* Handles invoking the git-*-pack binaries
* @class Service
* @extends HttpDuplex
* @param {Object} opts - options to bootstrap the service object
* @param {http.IncomingMessage } req - http request object
* @param {http.ServerResponse} res - http response
*/
constructor(opts, req, res) {
super(req, res);
var data = '';
var self = this;
this.status = 'pending';
this.repo = opts.repo;
this.service = opts.service;
this.cwd = opts.cwd;
this.logs = [];
var buffered = through().pause();
// stream needed to receive data after decoding, but before accepting
var ts = through();
var decoder = {
'gzip': () => zlib.createGunzip(),
'deflate': () => zlib.createDeflate()
}[req.headers['content-encoding']];
Iif (decoder) {
// data is compressed with gzip or deflate
req.pipe(decoder()).pipe(ts).pipe(buffered);
} else {
// data is not compressed
req.pipe(ts).pipe(buffered);
}
Iif(req.headers["authorization"]) {
const tokens = req.headers["authorization"].split(" ");
if (tokens[0] === "Basic") {
const splitHash = Buffer.from(tokens[1], 'base64').toString('utf8').split(":");
this.username = splitHash.shift();
}
}
ts.once('data', function onData(buf) {
data += buf;
var ops = data.match(new RegExp(headerRE[self.service], 'gi'));
Iif (!ops) return;
data = undefined;
ops.forEach(function(op) {
var type;
var m = op.match(new RegExp(headerRE[self.service]));
if (self.service === 'receive-pack') {
self.last = m[1];
self.commit = m[2];
if (m[3] == 'heads') {
type = 'branch';
self.evName = 'push';
} else {
type = 'version';
self.evName = 'tag';
}
var headers = {
last: self.last,
commit: self.commit
};
headers[type] = self[type] = m[4];
self.emit('header', headers);
} else Eif (self.service === 'upload-pack') {
self.commit = m[1];
self.evName = 'fetch';
self.emit('header', {
commit: self.commit
});
}
});
});
self.once('accept', function onAccept() {
process.nextTick(function() {
const cmd = os.platform() == 'win32' ?
['git', opts.service, '--stateless-rpc', opts.cwd]
:
['git-' + opts.service, '--stateless-rpc', opts.cwd];
const ps = spawn(cmd[0], cmd.slice(1));
ps.on('error', function(err) {
self.emit('error', new Error(`${err.message} running command ${cmd.join(' ')}`));
});
self.emit('service', ps);
var respStream = through(function write(c) {
if (self.listeners('response').length === 0) {
if(self.logs.length > 0) {
while(self.logs.length > 0) {
this.queue(self.logs.pop());
}
}
return this.queue(c);
}
// prevent git from sending the close signal
if (c.length === 4 && c.toString() === '0000') return;
this.queue(c);
}, function end() {
if (self.listeners('response').length > 0) return;
this.queue(null);
});
respStream.log = function() {
self.log(...arguments);
};
self.emit('response', respStream, function endResponse() {
res.queue(Buffer.from('0000'));
res.queue(null);
});
ps.stdout.pipe(respStream).pipe(res);
buffered.pipe(ps.stdin);
buffered.resume();
ps.on('exit', () => {
if(self.logs.length > 0) {
while(self.logs.length > 0) {
respStream.queue(self.logs.pop());
}
respStream.queue(Buffer.from('0000'));
respStream.queue(null);
}
self.emit.bind(self, 'exit');
});
});
});
self.once('reject', function onReject(code, msg) {
res.statusCode = code;
res.end(msg);
});
}
log() {
const _log = util.format(...arguments);
const SIDEBAND = String.fromCharCode(2); // PROGRESS
const message = `${SIDEBAND}${_log}\n`;
const formattedMessage = Buffer.from(packSideband(message));
this.logs.unshift(formattedMessage);
}
/**
* reject request in flight
* @method reject
* @memberof Service
* @param {Number} code - http response code
* @param {String} msg - message that should be displayed on teh client
*/
reject(code, msg) {
Iif (this.status !== 'pending') return;
Iif (msg === undefined && typeof code === 'string') {
msg = code;
code = 500;
}
this.status = 'rejected';
this.emit('reject', code || 500, msg);
}
/**
* accepts request to access resource
* @method accept
* @memberof Service
*/
accept() {
if (this.status !== 'pending') return;
this.status = 'accepted';
this.emit('accept');
}
}
module.exports = Service;
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