| 1 | const { spawn, spawnSync } = require('child_process'); |
| 2 | const path = require('path'); |
| 3 | const fs = require('fs'); |
| 4 | const config = require('./config'); |
| 5 | const git = require('./git'); |
| 6 | const log = require('./log'); |
| 7 | const respond = require('./respond'); |
| 8 | |
| 9 | const SEP_CRLFCRLF = Buffer.from('\r\n\r\n'); |
| 10 | const SEP_LFLF = Buffer.from('\n\n'); |
| 11 | |
| 12 | let _backendPath = null; |
| 13 | |
| 14 | function backendPath() { |
| 15 | if (_backendPath) return _backendPath; |
| 16 | const configured = config.get('git.httpBackendPath'); |
| 17 | if (configured && fs.existsSync(configured)) { _backendPath = configured; return _backendPath; } |
| 18 | const result = spawnSync(config.get('git.binPath') || 'git', ['--exec-path'], |
| 19 | { encoding: 'utf8', timeout: 3000 }); |
| 20 | if (result.status === 0) { |
| 21 | const execDir = result.stdout.trim(); |
| 22 | const name = process.platform === 'win32' ? 'git-http-backend.exe' : 'git-http-backend'; |
| 23 | const candidate = path.join(execDir, name); |
| 24 | if (fs.existsSync(candidate)) { _backendPath = candidate; return _backendPath; } |
| 25 | } |
| 26 | throw new Error('git-http-backend not found. Set git.httpBackendPath in admin settings.'); |
| 27 | } |
| 28 | |
| 29 | function findSep(buf) { |
| 30 | const i4 = buf.indexOf(SEP_CRLFCRLF); |
| 31 | const i2 = buf.indexOf(SEP_LFLF); |
| 32 | if (i4 >= 0 && (i2 < 0 || i4 <= i2)) return { at: i4, len: 4 }; |
| 33 | if (i2 >= 0) return { at: i2, len: 2 }; |
| 34 | return null; |
| 35 | } |
| 36 | |
| 37 | function serve(req, res, owner, repo, operation) { |
| 38 | let backend; |
| 39 | try { backend = backendPath(); } |
| 40 | catch (e) { return respond.serverError(res, e.message); } |
| 41 | |
| 42 | const repoRoot = git.reposRoot(); |
| 43 | const pathInfo = '/' + owner + '/' + repo + '.git/' + operation; |
| 44 | const qs = req.url.includes('?') ? req.url.slice(req.url.indexOf('?') + 1) : ''; |
| 45 | |
| 46 | const env = { |
| 47 | GIT_PROJECT_ROOT: repoRoot, |
| 48 | GIT_HTTP_EXPORT_ALL: '1', |
| 49 | GIT_HTTP_RECEIVE_PACK: '1', |
| 50 | PATH_INFO: pathInfo, |
| 51 | QUERY_STRING: qs, |
| 52 | REQUEST_METHOD: req.method, |
| 53 | CONTENT_TYPE: req.headers['content-type'] || '', |
| 54 | CONTENT_LENGTH: req.headers['content-length'] || '', |
| 55 | REMOTE_ADDR: req.socket.remoteAddress || '', |
| 56 | HTTP_GIT_PROTOCOL: req.headers['git-protocol'] || '', |
| 57 | PATH: process.env.PATH || '' |
| 58 | }; |
| 59 | |
| 60 | const proc = spawn(backend, [], { env }); |
| 61 | req.pipe(proc.stdin); |
| 62 | |
| 63 | let headersDone = false; |
| 64 | const pending = []; |
| 65 | |
| 66 | proc.stdout.on('data', chunk => { |
| 67 | if (headersDone) { res.write(chunk); return; } |
| 68 | pending.push(chunk); |
| 69 | const combined = Buffer.concat(pending); |
| 70 | const sep = findSep(combined); |
| 71 | if (!sep) return; |
| 72 | |
| 73 | const headerText = combined.slice(0, sep.at).toString('ascii'); |
| 74 | const body = combined.slice(sep.at + sep.len); |
| 75 | |
| 76 | let status = 200; |
| 77 | const headers = {}; |
| 78 | for (const line of headerText.split(/\r?\n/)) { |
| 79 | const ci = line.indexOf(':'); |
| 80 | if (ci < 0) continue; |
| 81 | const k = line.slice(0, ci).trim().toLowerCase(); |
| 82 | const v = line.slice(ci + 1).trim(); |
| 83 | if (k === 'status') status = parseInt(v, 10) || 200; |
| 84 | else headers[k] = v; |
| 85 | } |
| 86 | |
| 87 | headersDone = true; |
| 88 | pending.length = 0; |
| 89 | res.writeHead(status, headers); |
| 90 | if (body.length) res.write(body); |
| 91 | }); |
| 92 | |
| 93 | proc.stdout.on('end', () => res.end()); |
| 94 | proc.stderr.on('data', d => log.warn('http-backend:', d.toString().trim())); |
| 95 | proc.on('error', e => { |
| 96 | log.error('http-backend spawn:', e.message); |
| 97 | if (!res.headersSent) respond.serverError(res, 'git http-backend error'); |
| 98 | else res.end(); |
| 99 | }); |
| 100 | } |
| 101 | |
| 102 | module.exports = { serve }; |
| 103 | |
