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import zlib from 'zlib';
import through from 'through';
import util from 'util';
import os from 'os';
import { spawn } from 'child_process';
import { HttpDuplex } from './http-duplex';
import { ServiceString } from './types';
import { packSideband } from './util';
const headerRegex: { [key: string]: string } = {
'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 decoder: { [key: string]: () => zlib.Gunzip | zlib.Deflate } = {
gzip: (): zlib.Gunzip => zlib.createGunzip(),
deflate: (): zlib.Deflate => zlib.createDeflate(),
};
export interface ServiceOptions {
repo: string;
cwd: string;
service: ServiceString;
}
export class Service extends HttpDuplex {
status: string;
repo: string;
service: string;
cwd: string;
logs: string[];
last: string | undefined;
commit: string | undefined;
evName: string | undefined;
username: string | undefined;
/**
* Handles invoking the git-*-pack binaries
* @param opts - options to bootstrap the service object
* @param req - http request object
* @param res - http response
*/
constructor(
opts: ServiceOptions,
req: http.IncomingMessage,
res: http.ServerResponse
) {
super(req, res);
let data = '';
this.status = 'pending';
this.repo = opts.repo;
this.service = opts.service;
this.cwd = opts.cwd;
this.logs = [];
const buffered = through().pause();
// stream needed to receive data after decoding, but before accepting
const ts = through();
const encoding = req.headers['content-encoding'];
if (encoding && decoder[encoding]) {
// data is compressed with gzip or deflate
req.pipe(decoder[encoding]()).pipe(ts).pipe(buffered);
} else {
// data is not compressed
req.pipe(ts).pipe(buffered);
}
if (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', (chunk: string) => {
data += chunk;
const ops = data.match(new RegExp(headerRegex[this.service], 'gi'));
if (!ops) return;
data = '';
ops.forEach((op) => {
let type;
const m = op.match(new RegExp(headerRegex[this.service]));
if (!m) return;
if (this.service === 'receive-pack') {
this.last = m[1];
this.commit = m[2];
if (m[3] == 'heads') {
type = 'branch';
this.evName = 'push';
} else {
type = 'version';
this.evName = 'tag';
}
const headers: { [key: string]: string } = {
last: this.last,
commit: this.commit,
};
headers[type] = (this as any)[type] = m[4];
this.emit('header', headers);
} else if (this.service === 'upload-pack') {
this.commit = m[1];
this.evName = 'fetch';
this.emit('header', {
commit: this.commit,
});
}
});
});
this.once('accept', () => {
process.nextTick(() => {
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', (error: Error) => {
this.emit(
'error',
new Error(`${error.message} running command ${cmd.join(' ')}`)
);
});
this.emit('service', ps);
const respStream = through(
// write
(c: any) => {
if (this.listeners('response').length === 0) {
if (this.logs.length > 0) {
while (this.logs.length > 0) {
respStream.queue(this.logs.pop());
}
}
return respStream.queue(c);
}
// prevent git from sending the close signal
if (c.length === 4 && c.toString() === '0000') return;
respStream.queue(c);
},
// read
() => {
if (this.listeners('response').length > 0) return;
respStream.queue(null);
}
);
(respStream as any).log = this.log.bind(this);
this.emit('response', respStream, function endResponse() {
(res as any).queue(Buffer.from('0000'));
(res as any).queue(null);
});
ps.stdout.pipe(respStream).pipe(res);
buffered.pipe(ps.stdin);
buffered.resume();
ps.on('exit', () => {
if (this.logs.length > 0) {
while (this.logs.length > 0) {
respStream.queue(this.logs.pop());
}
respStream.queue(Buffer.from('0000'));
respStream.queue(null);
}
this.emit('exit');
});
});
});
this.once('reject', function onReject(code: number, msg: string) {
res.statusCode = code;
res.end(msg);
});
}
log() {
// eslint-disable-next-line prefer-rest-params
const _log = util.format(...arguments);
const SIDEBAND = String.fromCharCode(2); // PROGRESS
const message = `${SIDEBAND}${_log}\n`;
const formattedMessage = Buffer.from(packSideband(message));
this.logs.unshift(formattedMessage.toString());
}
/**
* reject request in flight
* @param code - http response code
* @param msg - message that should be displayed on the client
*/
reject(code: number, msg: string) {
if (this.status !== 'pending') return;
if (msg === undefined && typeof code === 'string') {
msg = code;
code = 500;
}
this.status = 'rejected';
this.emit('reject', code || 500, msg);
}
/**
* accepts request to access resource
*/
accept() {
if (this.status !== 'pending') return;
this.status = 'accepted';
this.emit('accept');
}
}
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