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const path = require('path');
const http = require('http');
const https = require('https');
const url = require('url');
const qs = require('querystring');
const httpDuplex = require('./http-duplex');
const { spawn } = require('child_process');
const { EventEmitter } = require('events');
const { parseGitName, createAction, infoResponse, onExit, basicAuth, noCache } = require('./util');
const services = ['upload-pack', 'receive-pack'];
/**
* @event Git#push
* @type {Object}
* @property {HttpDuplex} push - is a http duplex object (see below) with these extra properties
* @property {String} push.repo - the string that defines the repo
* @property {String} push.commit - the string that defines the commit sha
* @property {String} push.branch - the string that defines the branch
* @example
repos.on('push', function (push) { ... }
Emitted when somebody does a `git push` to the repo.
Exactly one listener must call `push.accept()` or `push.reject()`. If there are
no listeners, `push.accept()` is called automatically.
*
**/
/**
* @event Git#tag
* @type {Object}
* @property {HttpDuplex} tag - an http duplex object (see below) with these extra properties:
* @property {String} tag.repo - the string that defines the repo
* @property {String} tag.commit - the string that defines the commit sha
* @property {String} tag.version - the string that defines the tag being pushed
* @example
repos.on('tag', function (tag) { ... }
Emitted when somebody does a `git push --tags` to the repo.
Exactly one listener must call `tag.accept()` or `tag.reject()`. If there are
No listeners, `tag.accept()` is called automatically.
*
**/
/**
* @event Git#fetch
* @type {Object}
* @property {HttpDuplex} fetch - an http duplex object (see below) with these extra properties:
* @property {String} fetch.repo - the string that defines the repo
* @property {String} fetch.commit - the string that defines the commit sha
* @example
repos.on('fetch', function (fetch) { ... }
Emitted when somebody does a `git fetch` to the repo (which happens whenever you
do a `git pull` or a `git clone`).
Exactly one listener must call `fetch.accept()` or `fetch.reject()`. If there are
no listeners, `fetch.accept()` is called automatically.
*
*/
/**
* @event Git#info
* @type {Object}
* @property {HttpDuplex} info - an http duplex object (see below) with these extra properties:
* @property {String} info.repo - the string that defines the repo
* @example
repos.on('info', function (info) { ... }
Emitted when the repo is queried for info before doing other commands.
Exactly one listener must call `info.accept()` or `info.reject()`. If there are
no listeners, `info.accept()` is called automatically.
*
*/
/**
* @event Git#info
* @type {Object}
* @property {HttpDuplex} info - an http duplex object (see below) with these extra properties:
* @property {String} info.repo - the string that defines the repo
* @example
repos.on('info', function (info) { ... }
Emitted when the repo is queried for info before doing other commands.
Exactly one listener must call `info.accept()` or `info.reject()`. If there are
no listeners, `info.accept()` is called automatically.
*
*/
/**
* @event Git#head
* @type {Object}
* @property {HttpDuplex} head - an http duplex object (see below) with these extra properties:
* @property {String} head.repo - the string that defines the repo
* @example
repos.on('head', function (head) { ... }
Emitted when the repo is queried for HEAD before doing other commands.
Exactly one listener must call `head.accept()` or `head.reject()`. If there are
no listeners, `head.accept()` is called automatically.
*
*/
class Git extends EventEmitter {
/**
*
* Handles invoking the git-*-pack binaries
* @class Git
* @extends EventEmitter
* @param {(String|Function)} repoDir - Create a new repository collection from the directory `repoDir`. `repoDir` should be entirely empty except for git repo directories. If `repoDir` is a function, `repoDir(repo)` will be used to dynamically resolve project directories. The return value of `repoDir(repo)` should be a string path specifying where to put the string `repo`. Make sure to return the same value for `repo` every time since `repoDir(repo)` will be called multiple times.
* @param {Object} options - options that can be applied on the new instance being created
* @param {Boolean=} options.autoCreate - By default, repository targets will be created if they don't exist. You can
disable that behavior with `options.autoCreate = true`
* @param {Function} options.authenticate - a function that has the following arguments ({ type, repo, username, password, headers }, next) and will be called when a request comes through if set
*
authenticate: ({ type, repo, username, password, headers }, next) => {
console.log(type, repo, username, password);
next();
}
// alternatively you can also pass authenticate a promise
authenticate: ({ type, repo, username, password, headers }, next) => {
console.log(type, repo, username, password);
return new Promise((resolve, reject) => {
if(username === 'foo') {
return resolve();
}
return reject("sorry you don't have access to this content");
});
}
* @param {Boolean=} options.checkout - If `opts.checkout` is true, create and expected checked-out repos instead of bare repos
*/
constructor(repoDir, options={}) {
super();
if(typeof repoDir === 'function') {
this.dirMap = repoDir;
} else {
this.dirMap = (dir) => {
return (path.normalize(dir ? path.join(repoDir, dir) : repoDir));
};
}
this.authenticate = options.authenticate;
this.autoCreate = options.autoCreate === false ? false : true;
this.checkout = options.checkout;
}
/**
* Get a list of all the repositories
* @method list
* @memberof Git
* @param {Function} callback function to be called when repositories have been found `function(error, repos)`
*/
list(callback) {
fs.readdir(this.dirMap(), (error, results) => {
if(error) return callback(error);
let repos = results.filter((r) => {
return r.substring(r.length - 3, r.length) == 'git';
}, []);
callback(null, repos);
});
}
/**
* Find out whether `repoName` exists in the callback `cb(exists)`.
* @method exists
* @memberof Git
* @param {String} repo - name of the repo
* @param {Function=} callback - function to be called when finished
*/
exists(repo, callback) {
fs.exists(this.dirMap(repo), callback);
}
/**
* Create a subdirectory `dir` in the repo dir with a callback `cb(err)`.
* @method mkdir
* @memberof Git
* @param {String} dir - directory name
* @param {Function=} callback - callback to be called when finished
*/
mkdir(dir, callback) {
// TODO: remove sync operations
const parts = this.dirMap(dir).split(path.sep);
for(var i = 0; i <= parts.length; i++) {
const directory = parts.slice(0, i).join(path.sep);
if(directory && !fs.existsSync(directory)) {
fs.mkdirSync(directory);
}
}
callback();
}
/**
* Create a new bare repository `repoName` in the instance repository directory.
* @method create
* @memberof Git
* @param {String} repo - the name of the repo
* @param {Function=} callback - Optionally get a callback `cb(err)` to be notified when the repository was created.
*/
create(repo, callback) {
var self = this;
Iif (typeof callback !== 'function') callback = function () {};
if (!/\.git$/.test(repo)) repo += '.git';
self.exists(repo, function (ex) {
if (!ex) {
self.mkdir(repo, next);
} else {
next();
}
});
function next (err) {
Iif (err) return callback(err);
var ps, error = '';
var dir = self.dirMap(repo);
Iif (self.checkout) {
ps = spawn('git', [ 'init', dir ]);
}
else {
ps = spawn('git', [ 'init', '--bare', dir ]);
}
ps.stderr.on('data', function (buf) { error += buf; });
onExit(ps, function (code) {
Iif (!callback) { return; }
else Iif (code) callback(error || true);
else callback(null);
});
}
}
/**
* returns the typeof service being process
* @method getType
* @param {String} service - the service type
* @return {String} - will respond with either fetch or push
*/
getType(service) {
switch(service) {
case 'upload-pack':
return 'fetch';
case 'receive-pack':
return 'push';
default:
return 'unknown';
}
}
/**
* Handle incoming HTTP requests with a connect-style middleware
* @method handle
* @memberof Git
* @param {Object} req - http request object
* @param {Object} res - http response object
*/
handle(req, res) {
const handlers = [
function(req, res) {
if (req.method !== 'GET') return false;
var self = this;
var u = url.parse(req.url);
var m = u.pathname.match(/\/(.+)\/info\/refs$/);
Iif (!m) return false;
Iif (/\.\./.test(m[1])) return false;
var repo = m[1];
var params = qs.parse(u.query);
Iif (!params.service) {
res.statusCode = 400;
res.end('service parameter required');
return;
}
var service = params.service.replace(/^git-/, '');
Iif (services.indexOf(service) < 0) {
res.statusCode = 405;
res.end('service not available');
return;
}
var repoName = parseGitName(m[1]);
var next = (error) => {
Iif(error) {
res.setHeader("Content-Type", 'text/plain');
res.setHeader("WWW-Authenticate", 'Basic realm="authorization needed"');
res.writeHead(401);
res.end(typeof error === 'string' ? error : error.toString());
return;
} else {
return infoResponse(self, repo, service, req, res);
}
};
// check if the repo is authenticated
if(this.authenticate) {
const type = this.getType(service);
const headers = req.headers;
const user = basicAuth.bind(null, req, res);
const promise = this.authenticate({ type, repo: repoName, user, headers }, (error) => {
return next(error);
});
if(promise instanceof Promise) {
return promise
.then(next)
.catch(next);
}
} else {
return next();
}
},
function(req, res) {
Eif (req.method !== 'GET') return false;
var u = url.parse(req.url);
var m = u.pathname.match(/^\/(.+)\/HEAD$/);
if (!m) return false;
if (/\.\./.test(m[1])) return false;
var self = this;
var repo = m[1];
var next = () => {
const file = self.dirMap(path.join(m[1], 'HEAD'));
self.exists(file, (ex) => {
if (ex) fs.createReadStream(file).pipe(res);
else {
res.statusCode = 404;
res.end('not found');
}
});
};
self.exists(repo, (ex) => {
const anyListeners = self.listeners('head').length > 0;
const dup = new httpDuplex(req, res);
dup.exists = ex;
dup.repo = repo;
dup.cwd = self.dirMap(repo);
dup.accept = dup.emit.bind(dup, 'accept');
dup.reject = dup.emit.bind(dup, 'reject');
dup.once('reject', (code) => {
dup.statusCode = code || 500;
dup.end();
});
if (!ex && self.autoCreate) {
dup.once('accept', (dir) => {
self.create(dir || repo, next);
});
self.emit('head', dup);
if (!anyListeners) dup.accept();
} else if (!ex) {
res.statusCode = 404;
res.setHeader('content-type', 'text/plain');
res.end('repository not found');
} else {
dup.once('accept', next);
self.emit('head', dup);
if (!anyListeners) dup.accept();
}
});
},
function(req, res) {
Iif (req.method !== 'POST') return false;
var m = req.url.match(/\/(.+)\/git-(.+)/);
Iif (!m) return false;
Iif (/\.\./.test(m[1])) return false;
var self = this;
var repo = m[1],
service = m[2];
Iif (services.indexOf(service) < 0) {
res.statusCode = 405;
res.end('service not available');
return;
}
res.setHeader('content-type', 'application/x-git-' + service + '-result');
noCache(res);
var action = createAction({
repo: repo,
service: service,
cwd: self.dirMap(repo)
}, req, res);
action.on('header', () => {
var evName = action.evName;
var anyListeners = self.listeners(evName).length > 0;
self.emit(evName, action);
if (!anyListeners) action.accept();
});
},
(req, res) => {
if (req.method !== 'GET' && req.method !== 'POST') {
res.statusCode = 405;
res.end('method not supported');
} else {
return false;
}
},
(req, res) => {
res.statusCode = 404;
res.end('not found');
}
];
res.setHeader('connection', 'close');
var self = this;
(function next(ix) {
var done = () => {
next(ix + 1);
};
var x = handlers[ix].call(self, req, res, done);
if (x === false) next(ix + 1);
})(0);
}
/**
* starts a git server on the given port
* @method listen
* @memberof Git
* @param {Number} port - the port to start the server on
* @param {Object=} options - the options to add extended functionality to the server
* @param {String=} options.type - this is either https or http (the default is http)
* @param {Buffer|String=} options.key - the key file for the https server
* @param {Buffer|String=} options.cert - the cert file for the https server
* @param {Function} callback - the function to call when server is started or error has occured
* @return {Git} - the Git instance, useful for chaining
*/
listen(port, options, callback) {
const self = this;
Eif(typeof options == 'function' || !options) {
callback = options;
options = { type: 'http' };
}
const createServer = options.type == 'http' ? http.createServer : https.createServer.bind(this, options);
this.server = createServer(function(req, res) {
self.handle(req, res);
});
this.server.listen(port, callback);
return this;
}
/**
* closes the server instance
* @method close
* @memberof Git
* @param {Promise} - will resolve or reject when the server closes or fails to close.
*/
close() {
return new Promise((resolve, reject) => {
this.server.close((err) => {
err ? reject(err) : resolve();
});
});
}
}
module.exports = Git;
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