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* @module lib/util
*/
const { spawn } = require('child_process');
const httpDuplex = require('./http-duplex');
const Service = require('./service');
const Util = {
/**
* adds headers to the response object to add cache control
* @method noCache
* @param {http.ServerResponse} res - http response
*/
noCache: function noCache(res) {
res.setHeader('expires', 'Fri, 01 Jan 1980 00:00:00 GMT');
res.setHeader('pragma', 'no-cache');
res.setHeader('cache-control', 'no-cache, max-age=0, must-revalidate');
},
/**
* sets and parses basic auth headers if they exist
* @method basicAuth
* @param {http.IncomingMessage } req - http request object
* @param {http.ServerResponse} res - http response
* @param {Function} callback - function(username, password, error)
*/
basicAuth: function basicAuth(req, res, callback) {
if(!req.headers["authorization"]) {
res.setHeader("Content-Type", 'text/plain');
res.setHeader("WWW-Authenticate", 'Basic realm="authorization needed"');
res.writeHead(401);
res.end('401 Unauthorized');
} else {
const tokens = req.headers["authorization"].split(" ");
Eif (tokens[0] === "Basic") {
const splitHash = Buffer.from(tokens[1], 'base64').toString('utf8').split(":");
const username = splitHash.shift();
const password = splitHash.join(":");
callback(username, password, null);
}
}
},
/**
* returns when process has fully exited
* @method onExit
* @param {EventEmitter} ps - event emitter to listen to
* @param {Function} callback - function(code, signature)
*/
onExit: function onExit(ps, callback) {
let code;
let sig;
let pending = 3;
const onend = () => {
if (--pending === 0) {
callback(code, sig);
}
};
ps.on('exit', (c, s) => {
code = c;
sig = s;
});
ps.on('exit', onend);
ps.stdout.on('end', onend);
ps.stderr.on('end', onend);
},
/**
* execute given git operation and respond
* @method serviceRespond
* @param {HttpDuplex} dup - duplex object to catch errors
* @param {String} service - the method that is responding infoResponse (push, pull, clone)
* @param {String} repoLocation - the repo path on disk
* @param {http.ServerResponse} res - http response
*/
serviceRespond: function serviceRespond(dup, service, repoLocation, res) {
const pack = (s) => {
var n = (4 + s.length).toString(16);
return Array(4 - n.length + 1).join('0') + n + s;
};
res.write(pack('# service=git-' + service + '\n'));
res.write('0000');
var cmd = null;
var isWin = /^win/.test(process.platform);
Iif (isWin) {
cmd = ['git', service, '--stateless-rpc', '--advertise-refs', repoLocation];
} else {
cmd = ['git-' + service, '--stateless-rpc', '--advertise-refs', repoLocation];
}
const ps = spawn(cmd[0], cmd.slice(1));
ps.on('error', (err) => {
dup.emit('error', new Error(`${err.message} running command ${cmd.join(' ')}`));
});
ps.stdout.pipe(res);
},
/**
* sends http response using the appropriate output from service call
* @method infoResponse
* @param {Git} git - an instance of git object
* @param {String} repo - the repository
* @param {String} service - the method that is responding infoResponse (push, pull, clone)
* @param {http.IncomingMessage } req - http request object
* @param {http.ServerResponse} res - http response
*/
infoResponse: function infoResponse(git, repo, service, req, res) {
var dup = new httpDuplex(req, res);
dup.cwd = git.dirMap(repo);
dup.repo = repo;
dup.accept = dup.emit.bind(dup, 'accept');
dup.reject = dup.emit.bind(dup, 'reject');
dup.once('reject', (code) => {
res.statusCode = code || 500;
res.end();
});
var anyListeners = git.listeners('info').length > 0;
git.exists(repo, (ex) => {
dup.exists = ex;
if (!ex && git.autoCreate) {
dup.once('accept', () => {
git.create(repo, next);
});
git.emit('info', dup);
Eif (!anyListeners) dup.accept();
} else Iif (!ex) {
res.statusCode = 404;
res.setHeader('content-type', 'text/plain');
res.end('repository not found');
} else {
dup.once('accept', next);
git.emit('info', dup);
Eif (!anyListeners) dup.accept();
}
});
function next() {
res.setHeader(
'content-type',
'application/x-git-' + service + '-advertisement'
);
Util.noCache(res);
Util.serviceRespond(
git,
service,
git.dirMap(repo),
res
);
}
},
/**
* parses a git string and returns the repo name
* @method parseGitName
* @param {String} repo - the raw repo name containing .git
* @return {String} returns the name of the repo
*/
parseGitName: function parseGitName(repo) {
const locationOfGit = repo.lastIndexOf('.git');
return repo.substr(0, locationOfGit > 0 ? locationOfGit : repo.length);
},
/**
* responds with the correct service depending on the action
* @method createAction
* @param {Object} opts - options to pass Service
* @param {http.IncomingMessage } req - http request object
* @param {http.ServerResponse} res - http response
* @return {Service}
*/
createAction: function createAction(opts, req, res) {
let service = new Service(opts, req, res);
Object.keys(opts).forEach((key) => {
service[key] = opts[key];
});
return service;
}
};
module.exports = Util;
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