node-nlp
Version:
Library for NLU (Natural Language Understanding) done in Node.js
83 lines (82 loc) • 2.91 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var logger = require("../logger");
var request = require("request");
var getPem = require('rsa-pem-from-mod-exp');
var base64url = require('base64url');
var OpenIdMetadata = (function () {
function OpenIdMetadata(url) {
this.lastUpdated = 0;
this.url = url;
}
OpenIdMetadata.prototype.getKey = function (keyId, cb) {
var _this = this;
var now = new Date().getTime();
if (this.lastUpdated < (now - 1000 * 60 * 60 * 24 * 5)) {
this.refreshCache(function (err) {
if (err) {
logger.error('Error retrieving OpenId metadata at ' + _this.url + ', error: ' + err.toString());
}
var key = _this.findKey(keyId);
cb(key);
});
}
else {
var key = this.findKey(keyId);
cb(key);
}
};
OpenIdMetadata.prototype.refreshCache = function (cb) {
var _this = this;
var options = {
method: 'GET',
url: this.url,
json: true
};
request(options, function (err, response, body) {
if (!err && (response.statusCode >= 400 || !body)) {
err = new Error('Failed to load openID config: ' + response.statusCode);
}
if (err) {
cb(err);
}
else {
var openIdConfig = body;
var options = {
method: 'GET',
url: openIdConfig.jwks_uri,
json: true
};
request(options, function (err, response, body) {
if (!err && (response.statusCode >= 400 || !body)) {
err = new Error("Failed to load Keys: " + response.statusCode);
}
if (!err) {
_this.lastUpdated = new Date().getTime();
_this.keys = body.keys;
}
cb(err);
});
}
});
};
OpenIdMetadata.prototype.findKey = function (keyId) {
if (!this.keys) {
return null;
}
for (var i = 0; i < this.keys.length; i++) {
if (this.keys[i].kid == keyId) {
var key = this.keys[i];
if (!key.n || !key.e) {
return null;
}
var modulus = base64url.toBase64(key.n);
var exponent = key.e;
return { key: getPem(modulus, exponent), endorsements: key.endorsements };
}
}
return null;
};
return OpenIdMetadata;
}());
exports.OpenIdMetadata = OpenIdMetadata;