feat(csharp): add jwt token lifetime from config

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Change Log
 
+- csharp: jwt token lifetime from config
 - golang: jwt token lifetime from config
 
 ## 1.13.0

web/documentserver-example/csharp/JwtManager.cs

@@ -20,6 +20,7 @@ using JWT;
 using JWT.Algorithms;
 using JWT.Builder;
 using JWT.Serializers;
+using System;
 using System.Collections.Generic;
 using System.Web.Configuration;
 
@@ -28,6 +29,7 @@ namespace OnlineEditorsExample
     public static class JwtManager
     {
         private static readonly string Secret;
+        private static readonly int ExpiresIn;
         public static readonly bool Enabled;
         public static readonly bool SignatureUseForRequest;
 
@@ -35,12 +37,19 @@ namespace OnlineEditorsExample
         {
             Secret = WebConfigurationManager.AppSettings["files.docservice.secret"] ?? "";  // get token secret from the config parameters
             Enabled = !string.IsNullOrEmpty(Secret);  // check if the token is enabled
+            ExpiresIn = int.Parse(WebConfigurationManager.AppSettings["files.docservice.token.expires-in"]);
             SignatureUseForRequest = bool.Parse(WebConfigurationManager.AppSettings["files.docservice.token.useforrequest"]);
         }
 
         // encode a payload object into a token using a secret key
         public static string Encode(IDictionary<string, object> payload)
         {
+            var now = (int)DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
+            var expires = now + ExpiresIn * 60;
+
+            payload["iat"] = now;
+            payload["exp"] = expires;
+
             var encoder = new JwtEncoder(new HMACSHA256Algorithm(),
                                          new JsonNetSerializer(),
                                          new JwtBase64UrlEncoder());

web/documentserver-example/csharp/settings.config

@@ -14,6 +14,7 @@
   <add key="files.docservice.verify-peer-off" value="true"/>
 
   <add key="files.docservice.token.useforrequest" value="true" />
+  <add key="files.docservice.token.expires-in" value="5"/>
 
   <add key="files.docservice.languages" value="en:English|sq-AL:Albanian (Albania)|ar:Arabic|hy:Armenian|az:Azerbaijani|eu:Basque|be:Belarusian|bg:Bulgarian|ca:Catalan|zh:Chinese (Simplified)|zh-TW:Chinese (Traditional)|cs:Czech|da:Danish|nl:Dutch|en-GB:English (United Kingdom)|fi:Finnish|fr:French|gl:Galego|de:German|el:Greek|he-IL:Hebrew (Israel)|hu:Hungarian|id:Indonesian|it:Italian|ja:Japanese|ko:Korean|lo:Lao|lv:Latvian|ms:Malay (Malaysia)|no:Norwegian|pl:Polish|pt:Portuguese (Brazil)|pt-PT:Portuguese (Portugal)|ro:Romanian|ru:Russian|sr-Cyrl-RS:Serbian (Cyrillic)|sr-Latn-RS:Serbian (Latin)|si:Sinhala (Sri Lanka)|sk:Slovak|sl:Slovenian|es:Spanish|sv:Swedish|tr:Turkish|uk:Ukrainian|vi:Vietnamese|aa-AA: Test Language"/>