Add config.expireInactiveSession to add support for non-expiring inactive sessions (#1536)

* Create non-expiring session when sessionLength is zero

* Introduce expireInactiveSessions setting

src/Config.js

@@ -48,6 +48,7 @@ export class Config {
     this.mount = removeTrailingSlash(mount);
     this.liveQueryController = cacheInfo.liveQueryController;
     this.sessionLength = cacheInfo.sessionLength;
+    this.expireInactiveSessions = cacheInfo.expireInactiveSessions;
     this.generateSessionExpiresAt = this.generateSessionExpiresAt.bind(this);
     this.revokeSessionOnPasswordReset = cacheInfo.revokeSessionOnPasswordReset;
   }
@@ -69,7 +70,7 @@ export class Config {
       }
     }
 
-    this.validateSessionLength(options.sessionLength);
+    this.validateSessionConfiguration(options.sessionLength, options.expireInactiveSessions);
   }
 
   static validateEmailConfiguration({verifyUserEmails, appName, publicServerURL}) {
@@ -95,16 +96,21 @@ export class Config {
     this._mount = newValue;
   }
 
-  static validateSessionLength(sessionLength) {
-    if(isNaN(sessionLength)) {
-      throw 'Session length must be a valid number.';
-    }
-    else if(sessionLength <= 0) {
-      throw 'Session length must be a value greater than 0.'
+  static validateSessionConfiguration(sessionLength, expireInactiveSessions) {
+    if (expireInactiveSessions) {
+      if (isNaN(sessionLength)) {
+        throw 'Session length must be a valid number.';
+      }
+      else if (sessionLength <= 0) {
+        throw 'Session length must be a value greater than 0.'
+      }
     }
   }
 
   generateSessionExpiresAt() {
+    if (!this.expireInactiveSessions) {
+      return undefined;
+    }
     var now = new Date();
     return new Date(now.getTime() + (this.sessionLength*1000));
   }
@@ -132,7 +138,7 @@ export class Config {
   get verifyEmailURL() {
     return `${this.publicServerURL}/apps/${this.applicationId}/verify_email`;
   }
-};
+}
 
 export default Config;
 module.exports = Config;

src/ParseServer.js

@@ -114,6 +114,7 @@ class ParseServer {
     },
     liveQuery = {},
     sessionLength = 31536000, // 1 Year in seconds
+    expireInactiveSessions = true,
     verbose = false,
     revokeSessionOnPasswordReset = true,
   }) {
@@ -188,6 +189,7 @@ class ParseServer {
       maxUploadSize: maxUploadSize,
       liveQueryController: liveQueryController,
       sessionLength: Number(sessionLength),
+      expireInactiveSessions: expireInactiveSessions,
       revokeSessionOnPasswordReset
     });