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import { spawn } from 'child_process';
import { Git } from './git';
import { HttpDuplex } from './http-duplex';
import { Service, ServiceOptions } from './service';
import { ServiceString } from './types';
export function packSideband(s: string): string {
const n = (4 + s.length).toString(16);
return Array(4 - n.length + 1).join('0') + n + s;
}
/**
* adds headers to the response object to add cache control
* @param res - http response
*/
export function noCache(res: http.ServerResponse) {
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
* @param req - http request object
* @param res - http response
* @param callback - function(username, password)
*/
export function basicAuth(
req: http.IncomingMessage,
res: http.ServerResponse,
callback: (username?: string, password?: string) => void
) {
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(' ');
if (tokens[0] === 'Basic') {
const splitHash = Buffer.from(tokens[1], 'base64')
.toString('utf8')
.split(':');
const username = splitHash.shift();
const password = splitHash.join(':');
callback(username, password);
}
}
}
/**
* execute given git operation and respond
* @param dup - duplex object to catch errors
* @param service - the method that is responding infoResponse (push, pull, clone)
* @param repoLocation - the repo path on disk
* @param res - http response
*/
export function serviceRespond(
dup: HttpDuplex | Git,
service: ServiceString,
repoLocation: string,
res: http.ServerResponse
) {
res.write(packSideband('# service=git-' + service + '\n'));
res.write('0000');
const isWin = /^win/.test(process.platform);
const cmd = isWin
? ['git', service, '--stateless-rpc', '--advertise-refs', repoLocation]
: ['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
* @param git - an instance of git object
* @param repo - the repository
* @param service - the method that is responding infoResponse (push, pull, clone)
* @param req - http request object
* @param res - http response
*/
export function infoResponse(
git: Git,
repo: string,
service: ServiceString,
req: http.IncomingMessage,
res: http.ServerResponse
) {
function next() {
res.setHeader(
'content-type',
'application/x-git-' + service + '-advertisement'
);
noCache(res);
serviceRespond(git, service, git.dirMap(repo), res);
}
const 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: number) => {
res.statusCode = code || 500;
res.end();
});
const anyListeners = git.listeners('info').length > 0;
const exists = git.exists(repo);
dup.exists = exists;
if (!exists && git.autoCreate) {
dup.once('accept', () => {
git.create(repo, next);
});
git.emit('info', dup);
if (!anyListeners) dup.accept();
} else if (!exists) {
res.statusCode = 404;
res.setHeader('content-type', 'text/plain');
res.end('repository not found');
} else {
dup.once('accept', next);
git.emit('info', dup);
if (!anyListeners) dup.accept();
}
}
/**
* parses a git string and returns the repo name
* @param repo - the raw repo name containing .git
*/
export function parseGitName(repo: string): string {
const locationOfGit = repo.lastIndexOf('.git');
return repo.slice(0, locationOfGit > 0 ? locationOfGit : repo.length);
}
/**
* responds with the correct service depending on the action
* @param opts - options to pass Service
* @param req - http request object
* @param res - http response
*/
export function createAction(
opts: ServiceOptions,
req: http.IncomingMessage,
res: http.ServerResponse
): Service {
const service = new Service(opts, req, res);
// TODO: see if this works or not
// Object.keys(opts).forEach((key) => {
// service[key] = opts[key];
// });
return service;
}
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