secret cache

lib/engine.js

@@ -45,6 +45,7 @@ module.exports = Class.create({
 	eventQueue: null,
 	kids: null,
 	state: null,
+	secretCache: {},
 
 	defaultWebHookTextTemplates: {
 		"job_start": "Job started on [hostname]: [event_title] [job_details_url]",
@@ -261,13 +262,25 @@ module.exports = Class.create({
 	},
 
 	decryptObject: function (encObj) {
+		if(this.server.config.get('cache_secrets')) {
+			let cached = this.secretCache[encObj.substring(0,40)]			
+			if(cached) {
+				this.logDebug(9, 'Secret fetched from cache')
+				return cached;			
+			}
+		}
 		const encParts = encObj.split(":");
 		const IV = Buffer.from(encParts[0], outputEncoding);
 		const encryptedText = Buffer.from(encParts[1], outputEncoding);
 		const decipher = crypto.createDecipheriv(algorithm, this.eKey, IV);
 		let decrypted = decipher.update(encryptedText, outputEncoding, inputEncoding);
 		decrypted += decipher.final(inputEncoding);
-		return JSON.parse(decrypted);
+		let plain = JSON.parse(decrypted);
+		if(this.server.config.get('cache_secrets')) {
+			this.secretCache[encObj.substring(0,40)] = plain; // put into cache
+			this.logDebug(9, 'Secret put to cache')
+		}
+		return plain;
 	},
 
 	safeJobLog: function(job) { // print less verbose, more readable job data on logging