var createHash = require('crypto').createHash; function get_header(header, credentials, opts) { var type = header.split(' ')[0], user = credentials[0], pass = credentials[1]; if (type == 'Digest') { return digest.generate(header, user, pass, opts.method, opts.path); } else if (type == 'Basic') { return basic(user, pass); } } //////////////////// // basic function md5(string) { return createHash('md5').update(string).digest('hex'); } function basic(user, pass) { var str = typeof pass == 'undefined' ? user : [user, pass].join(':'); return 'Basic ' + Buffer.from(str).toString('base64'); } //////////////////// // digest // logic inspired from https://github.com/simme/node-http-digest-client var digest = {}; digest.parse_header = function(header) { var challenge = {}, matches = header.match(/([a-z0-9_-]+)="?([a-z0-9_=\/\.@\s-\+)()]+)"?/gi); for (var i = 0, l = matches.length; i < l; i++) { var parts = matches[i].split('='), key = parts.shift(), val = parts.join('=').replace(/^"/, '').replace(/"$/, ''); challenge[key] = val; } return challenge; } digest.update_nc = function(nc) { var max = 99999999; nc++; if (nc > max) nc = 1; var padding = new Array(8).join('0') + ''; nc = nc + ''; return padding.substr(0, 8 - nc.length) + nc; } digest.generate = function(header, user, pass, method, path) { var nc = 1, cnonce = null, challenge = digest.parse_header(header); var ha1 = md5(user + ':' + challenge.realm + ':' + pass), ha2 = md5(method.toUpperCase() + ':' + path), resp = [ha1, challenge.nonce]; if (typeof challenge.qop === 'string') { cnonce = md5(Math.random().toString(36)).substr(0, 8); nc = digest.update_nc(nc); resp = resp.concat(nc, cnonce); resp = resp.concat(challenge.qop, ha2); } else { resp = resp.concat(ha2); } var params = { uri : path, realm : challenge.realm, nonce : challenge.nonce, username : user, response : md5(resp.join(':')) } if (challenge.qop) { params.qop = challenge.qop; } if (challenge.opaque) { params.opaque = challenge.opaque; } if (cnonce) { params.nc = nc; params.cnonce = cnonce; } header = [] for (var k in params) header.push(k + '="' + params[k] + '"') return 'Digest ' + header.join(', '); } module.exports = { header : get_header, basic : basic, digest : digest.generate }