implemented editing of list credentials for admin/owner, fixed bug:

if login fails due to wrong auth, it is no longer repeated. instead, the list is disabeld

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.example</groupId>
     <artifactId>Widerhall</artifactId>
-    <version>0.2.21</version>
+    <version>0.2.22</version>
     <build>
         <plugins>
             <plugin>

src/main/java/de/srsoftware/widerhall/data/Database.java

@@ -183,6 +183,11 @@ public class Database {
             }
         }
 
+
+        public void run() throws SQLException {
+            compile().run();
+        }
+
         /**
          * set single value for a certain key
          * @param key
@@ -194,6 +199,11 @@ public class Database {
             return this;
         }
 
+        public Request sort(String field) {
+            sortFields.add(field);
+            return this;
+        }
+
         /**
          * get the current (i.e. non-final) sql
          * @return
@@ -251,11 +261,6 @@ public class Database {
             list.add(value);
             return this;
         }
-
-        public Request sort(String field) {
-            sortFields.add(field);
-            return this;
-        }
     }
 
     public Database(Connection connection) {

src/main/java/de/srsoftware/widerhall/data/ListMember.java

@@ -406,6 +406,10 @@ public class ListMember {
         }
     }
 
+    public static void updateListEmail(String oldEmail, String newEmail) throws SQLException {
+        Database.open().update(TABLE_NAME).set(LIST_EMAIL,newEmail).where(LIST_EMAIL,oldEmail).compile().run();
+    }
+
     public User user(){
         return user;
     }

src/main/java/de/srsoftware/widerhall/data/MailingList.java

@@ -3,14 +3,12 @@ package de.srsoftware.widerhall.data;
 import de.srsoftware.widerhall.Configuration;
 import de.srsoftware.widerhall.mail.ImapClient;
 import de.srsoftware.widerhall.mail.MessageHandler;
+import de.srsoftware.widerhall.mail.ProblemListener;
 import de.srsoftware.widerhall.mail.SmtpClient;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.mail.Address;
+import javax.mail.*;
-import javax.mail.Flags;
-import javax.mail.Message;
-import javax.mail.MessagingException;
 import javax.mail.internet.AddressException;
 import javax.mail.internet.InternetAddress;
 import java.io.*;
@@ -27,7 +25,7 @@ import static de.srsoftware.widerhall.data.User.PERMISSION_ADMIN;
 /**
  * this class encapsulates a MailingList db object
  */
-public class MailingList implements MessageHandler {
+public class MailingList implements MessageHandler, ProblemListener {
     public static final String KEY_FORWARD_FROM = "forward_from";
     public static final String KEY_FORWARD_ATTACHED = "forward_attached";
     public static final String KEY_HIDE_RECEIVERS = "hide_receivers";
@@ -61,11 +59,11 @@ public class MailingList implements MessageHandler {
     private static final int HIDDEN = 0;
     private static final int DEFAULT_STATE = STATE_PENDING|STATE_HIDE_RECEIVERS|STATE_PUBLIC_ARCHIVE;
     private static final String RETAINED_FOLDER = "retained";
-    private final String name;
+    private static final String LAST_ERROR = "last_error";
-    private final String email;
+    private String email, name, lastError;
     private int state;
-    private final SmtpClient smtp;
+    private SmtpClient smtp;
-    private final ImapClient imap;
+    private ImapClient imap;
 
     private static final HashMap<String,MailingList> cache = new HashMap<>();
 
@@ -88,7 +86,7 @@ public class MailingList implements MessageHandler {
         this.name = name;
         this.state = state;
         this.smtp = new SmtpClient(smtpHost,smtpPort,smtpUser,smtpPass);
-        this.imap = new ImapClient(imapHost,imapPort,imapUser,imapPass,inbox);
+        this.imap = new ImapClient(imapHost,imapPort,imapUser,imapPass,inbox,this);
     }
 
     public MailingList archive(boolean enabled) throws SQLException {
@@ -133,7 +131,8 @@ public class MailingList implements MessageHandler {
                 .append(SMTP_PORT).append(" ").append(INT).append(", ")
                 .append(SMTP_USER).append(" ").append(VARCHAR).append(", ")
                 .append(SMTP_PASS).append(" ").append(VARCHAR).append(", ")
-                .append(STATE).append(" ").append(INT)
+                .append(STATE).append(" ").append(INT).append(", ")
+                .append(LAST_ERROR).append(" ").append(TEXT)
                 .append(");");
         Database.open().query(sql).compile().run();
     }
@@ -146,7 +145,10 @@ public class MailingList implements MessageHandler {
     public MailingList enable(boolean enable) throws SQLException {
         if (!enable) imap.stop();
         setFlag(STATE_ENABLED,enable);
-        if (enable) imap.start().addListener(this);
+        if (enable) {
+            setLastError(null);
+            imap.start().addListener(this);
+        }
         return this;
     }
 
@@ -273,12 +275,15 @@ public class MailingList implements MessageHandler {
     public static MailingList load(String listEmail) {
         if (listEmail == null) return null;
         var ml = cache.get(listEmail);
-        if (ml == null) try {
+        try {
             var rs = Database.open()
                     .select(TABLE_NAME)
                     .where(EMAIL,listEmail)
                     .compile().exec();
-            if (rs.next()) ml = MailingList.from(rs);
+            if (rs.next()) {
+                if (ml == null ) ml = MailingList.from(rs);
+                ml.lastError = rs.getString(LAST_ERROR);
+            }
         } catch (SQLException e) {
             LOG.debug("Failed to load MailingList: ",e);
         }
@@ -352,6 +357,7 @@ public class MailingList implements MessageHandler {
         map.put(EMAIL,Map.of(PREFIX,parts[0],DOMAIN,parts[1]));
         map.put(NAME, name);
         map.put(STATE, stateMap());
+        map.put(LAST_ERROR, lastError);
         return map;
     }
 
@@ -381,6 +387,16 @@ public class MailingList implements MessageHandler {
         return name;
     }
 
+    @Override
+    public void onImapException(MessagingException e) {
+        try {
+            if (e instanceof AuthenticationFailedException afe) this.enable(false);
+            setLastError(e.getMessage());
+        } catch (SQLException sqle) {
+            LOG.warn("Database error during onImapException ({})",e.getMessage(),sqle);
+        }
+    }
+
     @Override
     public void onMessageReceived(Message message) throws MessagingException {
         LOG.info("Message received: {}",message.getFrom());
@@ -477,6 +493,7 @@ public class MailingList implements MessageHandler {
         if (smtp.port() != 0) map.put(SMTP_PORT, smtp.port());
         if (smtp.username() != null) map.put(SMTP_USER, smtp.username());
         map.put(STATE,stateMap());
+        if (lastError != null) map.put(LAST_ERROR, lastError);
         return map;
     }
 
@@ -550,6 +567,10 @@ public class MailingList implements MessageHandler {
         return this;
     }
 
+    private void setLastError(String message) throws SQLException {
+        Database.open().update(TABLE_NAME).set(LAST_ERROR,message).where(EMAIL,email()).run();
+    }
+
     public Map<String,Integer> stateMap(){
         var map = new HashMap<String,Integer>();
         if (hasState(STATE_ENABLED)) map.put("enabled",VISIBLE);
@@ -664,4 +685,32 @@ public class MailingList implements MessageHandler {
             return new ArrayList<InternetAddress>().stream();
         }
     }
+
+    public void update(String name, String email, String imapHost, Integer imapPort, String imapUser, String imapPass, String inbox, String smtpHost, Integer smtpPort, String smtpUser, String smtpPass) throws SQLException {
+        imap.stop();
+        Database.open()
+                .update(TABLE_NAME)
+                .set(EMAIL, email)
+                .set(NAME, name)
+                .set(IMAP_HOST, imapHost)
+                .set(IMAP_PORT, imapPort)
+                .set(IMAP_USER, imapUser)
+                .set(IMAP_PASS, imapPass)
+                .set(INBOX,inbox)
+                .set(SMTP_HOST, smtpHost)
+                .set(SMTP_PORT, smtpPort)
+                .set(SMTP_USER, smtpUser)
+                .set(SMTP_PASS, smtpPass)
+                .where(EMAIL,email())
+                .compile()
+                .run();
+        if (!this.email.equals(email)){
+            ListMember.updateListEmail(this.email,email);
+            this.email = email;
+        }
+        this.name = name;
+        smtp = new SmtpClient(smtpHost,smtpPort,smtpUser,smtpPass);
+        imap = new ImapClient(imapHost,imapPort,imapUser,imapPass,inbox,this);
+        if (this.hasState(STATE_ENABLED)) imap.start().addListener(this);
+    }
 }

src/main/java/de/srsoftware/widerhall/mail/ImapClient.java

@@ -14,6 +14,7 @@ public class ImapClient {
     private static final Logger LOG = LoggerFactory.getLogger(ImapClient.class);
     private final int port;
     private final String host, username, password, folderName;
+    private final ProblemListener problemListener;
     private IMAPFolder inbox;
     private ListeningThread listeningThread;
     private Heartbeat heartbeat;
@@ -47,6 +48,7 @@ public class ImapClient {
                     openInbox();
                 } catch (MessagingException e){
                     LOG.warn("Connection problem:",e);
+                    problemListener.onImapException(e);
                 }
             }
         }
@@ -127,12 +129,13 @@ public class ImapClient {
         }
     }
 
-    public ImapClient(String host, int port, String username, String password, String folderName) {
+    public ImapClient(String host, int port, String username, String password, String folderName,ProblemListener listener) {
         this.host = host;
         this.port = port;
         this.username = username;
         this.password = password;
         this.folderName = folderName;
+        this.problemListener = listener;
     }
 
     public ImapClient addListener(MessageHandler messageHandler) {

src/main/java/de/srsoftware/widerhall/mail/ProblemListener.java

@@ -0,0 +1,7 @@
+package de.srsoftware.widerhall.mail;
+
+import javax.mail.MessagingException;
+
+public interface ProblemListener {
+    public void onImapException(MessagingException e);
+}

src/main/java/de/srsoftware/widerhall/web/Web.java

@@ -21,6 +21,7 @@ import java.util.Map;
 import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Util.t;
 import static de.srsoftware.widerhall.data.MailingList.*;
+import static de.srsoftware.widerhall.data.User.PERMISSION_ADMIN;
 
 public class Web extends TemplateServlet {
     public static final String WEB_ROOT = "/web";
@@ -29,6 +30,7 @@ public class Web extends TemplateServlet {
     private static final String CSS = "css";
     private static final Logger LOG = LoggerFactory.getLogger(Web.class);
     private static final String ADMIN = "admin";
+    private static final String EDIT_LIST = "edit_list";
     private static final String INSPECT = "inspect";
     private static final String LOGIN = "login";
     private static final String LOGOUT = "logout";
@@ -48,13 +50,10 @@ public class Web extends TemplateServlet {
     private static final int PRIMARY_KEY_CONSTRAINT = 19;
 
     private String addList(HttpServletRequest req, HttpServletResponse resp) {
-
+        var user = Util.getUser(req);
-        var o = req.getSession().getAttribute(USER);
+        if (user == null) return redirectTo(LOGIN,resp);
-        if (!(o instanceof User user)) {
-            return redirectTo(LOGIN,resp);
-        }
         var data = new HashMap<String, Object>();
-        data.put(USER, user);
+        data.put(USER, user.safeMap());
 
         if (!user.hashPermission(User.PERMISSION_CREATE_LISTS)){
             data.put(ERROR,t("You are not allowed to create new mailing lists!"));
@@ -128,7 +127,7 @@ public class Web extends TemplateServlet {
         try {
             var list = MailingList.create(email, name, imapHost, imapPort, imapUser, imapPass, inbox, smtpHost, smtpPort, smtpUser, smtpPass);
             ListMember.create(list, user, ListMember.STATE_OWNER);
-            return redirectTo(INDEX, resp);
+            return redirectTo(ADMIN, resp);
         } catch (SQLException e) {
             return t("Failed to create list '{}': {}", name, e.getMessage());
         }
@@ -164,6 +163,91 @@ public class Web extends TemplateServlet {
         if (error != null) resp.sendError(400,error);
     }
 
+    public String editList(HttpServletRequest req, HttpServletResponse resp) {
+        var user = Util.getUser(req);
+        if (user == null) return redirectTo(LOGIN,resp);
+
+        var data = new HashMap<String, Object>();
+        data.put(USER,user.safeMap());
+
+        var list = Util.getMailingList(req);
+        data.put(LIST,list.safeMap());
+        try {
+            var allowed = user.hashPermission(PERMISSION_ADMIN) || ListMember.load(list,user).isOwner();
+            if (!allowed) return loadTemplate(ADMIN,data,resp);
+
+            var name = req.getParameter(NAME);
+            data.put(NAME, name);
+
+            var email = req.getParameter(EMAIL);
+            data.put(EMAIL, email);
+
+            var imapHost = req.getParameter(IMAP_HOST);
+            data.put(IMAP_HOST, imapHost);
+            var imapUser = req.getParameter(IMAP_USER);
+            data.put(IMAP_USER, imapUser);
+            var imapPass = req.getParameter(IMAP_PASS);
+            var inbox = req.getParameter(INBOX);
+            if (inbox == null || inbox.isBlank()) inbox = DEFAULT_INBOX;
+            data.put(INBOX, inbox);
+
+            var smtpHost = req.getParameter(SMTP_HOST);
+            data.put(SMTP_HOST, smtpHost);
+            var smtpUser = req.getParameter(SMTP_USER);
+            data.put(SMTP_USER, smtpUser);
+            var smtpPass = req.getParameter(SMTP_PASS);
+
+            Integer imapPort = 993;
+            data.put(IMAP_PORT, imapPort);
+
+            Integer smtpPort = 465;
+            data.put(SMTP_PORT, smtpPort);
+
+            if (name == null || name.isBlank() || email == null || email.isBlank()) {
+                data.put(ERROR, "List name and address are required!");
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+            if (!Util.isEmail(email)) {
+                data.put(ERROR, t("List email ({}) is not a valid email address!", email));
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+            if (imapHost == null || imapHost.isBlank() || imapUser == null || imapUser.isBlank() || imapPass == null || imapPass.isBlank()) {
+                data.put(ERROR, "IMAP credentials are required!");
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+
+            try {
+                imapPort = Integer.parseInt(req.getParameter(IMAP_PORT));
+                data.put(IMAP_PORT, imapPort);
+            } catch (NumberFormatException nfe) {
+                data.put(ERROR, t("'{}' is not a proper port number!", req.getParameter(IMAP_PORT)));
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+            if (smtpHost == null || smtpHost.isBlank() || smtpUser == null || smtpUser.isBlank() || smtpPass == null || smtpPass.isBlank()) {
+                data.put(ERROR, "SMTP credentials are required!");
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+            try {
+                smtpPort = Integer.parseInt(req.getParameter(SMTP_PORT));
+                data.put(SMTP_PORT, smtpPort);
+            } catch (NumberFormatException nfe) {
+                data.put(ERROR, t("'{}' is not a proper port number!", req.getParameter(SMTP_PORT)));
+                return loadTemplate(EDIT_LIST, data, resp);
+            }
+
+            list.update(name,email,imapHost,imapPort,imapUser,imapPass,inbox,smtpHost,smtpPort,smtpUser,smtpPass);
+            return loadTemplate(ADMIN,data,resp);
+        } catch (SQLException e) {
+            LOG.warn("Editing list {} by {} failed",list.email(),user.email(),e);
+            return t("Editing list {} by {} failed",list.email(),user.email());
+        }
+    }
+
     private SQLException getCausingException(SQLException sqle) {
         Throwable cause = sqle.getCause();
         while (cause instanceof SQLException){
@@ -230,7 +314,10 @@ public class Web extends TemplateServlet {
 
         if (user != null){
             if (list != null) data.put(LIST,req.getParameter(LIST));
-            //data.put(NOTES,notes);
+            switch (path){
+                case EDIT_LIST:
+                    return editList(req,resp);
+            }
             return loadTemplate(path,data,resp);
         }
         return redirectTo(LOGIN,resp);
@@ -263,6 +350,8 @@ public class Web extends TemplateServlet {
         switch (path){
             case ADD_LIST:
                 return addList(req,resp);
+            case EDIT_LIST:
+                return editList(req,resp);
             case INSPECT:
                 return inspect(req,resp);
             case LOGIN:
@@ -367,7 +456,7 @@ public class Web extends TemplateServlet {
 
         try {
             var user = User.create(email, name, pass);
-            if (firstUser) user.addPermission(User.PERMISSION_ADMIN|User.PERMISSION_CREATE_LISTS);
+            if (firstUser) user.addPermission(PERMISSION_ADMIN|User.PERMISSION_CREATE_LISTS);
             req.getSession().setAttribute("user",user);
             return redirectTo(INDEX,resp);
         } catch (SQLException e) {

static/templates/add_list.st

@@ -9,66 +9,8 @@
     <body id="add_list">
         «navigation()»
         «userinfo()»
-        <h1>Widerhall List Creation</h1>
         «messages()»
-        <form method="POST" action="add_list">
+        <h1>Widerhall List Creation</h1>
-            <fieldset>
+        «list_data_form()»
-                <legend>List configuration</legend>
-                <fieldset>
-                    <legend>Basic data</legend>
-                    <label>
-                        <input type="text" name="name" value="«data.name»" id="name" />
-                        List name
-                    </label>
-                    <label>
-                        <input type="text" name="email" value="«data.email»" id="email" />
-                        List E-Mail Address
-                    </label>
-                </fieldset>
-                <fieldset>
-                    <legend>IMAP protocol</legend>
-                    <label>
-                        <input type="text" name="imap_host" value="«data.imap_host»" id="imap_host" />
-                        Hostname
-                    </label>
-                    <label>
-                        <input type="number" name="imap_port" value="«data.imap_port»" id="imap_port" />
-                        Port
-                    </label>
-                    <label>
-                        <input type="text" name="imap_user" value="«data.imap_user»" id="imap_user" />
-                        Username
-                    </label>
-                    <label>
-                        <input type="password" name="imap_pass" value="«data.imap_pass»" id="imap_pass" />
-                        Password
-                    </label>
-                    <label>
-                        <input type="text" name="inbox" value="«if(data.inbox)»«data.inbox»«else»INBOX«endif»" id="imap_inbox" />
-                        Inbox name
-                    </label>
-                </fieldset>
-                <fieldset>
-                    <legend>SMTP protocol</legend>
-                    <label>
-                        <input type="text" name="smtp_host" value="«data.smtp_host»" id="smtp_host" />
-                        Hostname
-                    </label>
-                    <label>
-                        <input type="number" name="smtp_port" value="«data.smtp_port»" id="smtp_port" />
-                        Port
-                    </label>
-                    <label>
-                        <input type="text" name="smtp_user" value="«data.smtp_user»" id="smtp_user" />
-                        Username
-                    </label>
-                    <label>
-                        <input type="password" name="smtp_pass" value="«data.smtp_pass»" id="smtp_pass" />
-                        Password
-                    </label>
-                </fieldset>
-                <button type="submit">Save new mailing list</button>
-            </fieldset>
-        </form>
     </body>
 </html>

static/templates/css.st

@@ -3,7 +3,7 @@ label {
     margin: 5px 0;
 }
 
-#add_list form,
+form#list_data,
 #login form,
 #register form,
 #subscribe form{

static/templates/edit_list.st

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8" />
+        <script src="jquery"></script>
+        <script src="js"></script>
+        <link rel="stylesheet" href="css" />
+    </head>
+    <body>
+        «navigation()»
+        «userinfo()»
+        «messages()»
+        <h1>Widerhall List Setup</h1>
+        «list_data_form()»
+        «footer()»
+    </body>
+</html>

static/templates/inspect.st

@@ -14,6 +14,7 @@
         <form method="POST">
             <fieldset>
                 <legend>Settings</legend>
+                This page shows configuration options for the mailing list. To edit login credentials, goto <a href="edit_list?list=«data.list»">edit list</a>
                 <fieldset>
                     <legend>Forward permissions</legend>
                     <p>

static/templates/js.st

@@ -110,7 +110,9 @@ function showListOfModeratedLists(data){
             if (list.state[state] > 0) states.push(state);
         }
         $('<td/>').text(states.toString()).appendTo(row);
-
+        if (list.last_error){
+            $('<td/>').html('<span class="error">'+list.last_error+'</span>').appendTo(row);
+        } else $('<td/>').text('-').appendTo(row);
         let select = $('<select/>',{name:addr}).change(function () {
             let action = $(this).children("option:selected").val();
             let list = $(this).attr('name');
@@ -123,11 +125,9 @@ function showListOfModeratedLists(data){
 
         $('<td/>').text(list.imap_host).appendTo(row);
         $('<td/>').text(list.imap_port).appendTo(row);
-        $('<td/>').text(list.imap_user).appendTo(row);
         $('<td/>').text(list.inbox).appendTo(row);
         $('<td/>').text(list.smtp_host).appendTo(row);
         $('<td/>').text(list.smtp_port).appendTo(row);
-        $('<td/>').text(list.smtp_user).appendTo(row);
         row.appendTo('#listlist');
     }
     if (data.user.permissions.includes('create lists')){

static/templates/list_data_form.st

@@ -0,0 +1,59 @@
+<form id="list_data" method="POST">
+    <fieldset>
+        <legend>List configuration</legend>
+        <fieldset>
+            <legend>Basic data</legend>
+            <label>
+                <input type="text" name="name" value="«if(data.name)»«data.name»«else»«data.list.name»«endif»" id="name" />
+                List name
+            </label>
+            <label>
+                <input type="text" name="email" value="«if(data.email)»«data.email»«else»«data.list.email.prefix»@«data.list.email.domain»«endif»" id="email" />
+                List E-Mail Address
+            </label>
+        </fieldset>
+        <fieldset>
+            <legend>IMAP protocol</legend>
+            <label>
+                <input type="text" name="imap_host" value="«if(data.imap_host)»«data.imap_host»«else»«data.list.imap_host»«endif»" id="imap_host" />
+                Hostname
+            </label>
+            <label>
+                <input type="number" name="imap_port" value="«if(data.imap_port)»«data.imap_port»«else»«data.list.imap_port»«endif»" id="imap_port" />
+                Port
+            </label>
+            <label>
+                <input type="text" name="imap_user" value="«if(data.imap_user)»«data.imap_user»«else»«data.list.imap_user»«endif»" id="imap_user" />
+                Username
+            </label>
+            <label>
+                <input type="password" name="imap_pass" value="«data.imap_pass»" id="imap_pass" />
+                Password
+            </label>
+            <label>
+                <input type="text" name="inbox" value="«if(data.inbox)»«data.inbox»«else»INBOX«endif»" id="imap_inbox" />
+                Inbox name
+            </label>
+        </fieldset>
+        <fieldset>
+            <legend>SMTP protocol</legend>
+            <label>
+                <input type="text" name="smtp_host" value="«if(data.smtp_host)»«data.smtp_host»«else»«data.list.smtp_host»«endif»" id="smtp_host" />
+                Hostname
+            </label>
+            <label>
+                <input type="number" name="smtp_port" value="«if(data.smtp_port)»«data.smtp_port»«else»«data.list.smtp_port»«endif»" id="smtp_port" />
+                Port
+            </label>
+            <label>
+                <input type="text" name="smtp_user" value="«if(data.smtp_user)»«data.smtp_user»«else»«data.list.smtp_user»«endif»" id="smtp_user" />
+                Username
+            </label>
+            <label>
+                <input type="password" name="smtp_pass" value="«data.smtp_pass»" id="smtp_pass" />
+                Password
+            </label>
+        </fieldset>
+        <button type="submit">Save mailing list</button>
+    </fieldset>
+</form>

static/templates/listadminlist.st

@@ -10,14 +10,13 @@
             <th>Name</th>
             <th>Address</th>
             <th>State</th>
+            <th>Last error</th>
             <th>Actions</th>
             <th>Host</th>
             <th>Port</th>
-            <th>User</th>
             <th>Inbox</th>
             <th>Host</th>
             <th>Port</th>
-            <th>User</th>
         </tr>
     </table>
     <a href="add_list">Add new mailing list</a>

static/templates/navigation.st

@@ -1,5 +1,9 @@
 <nav>
     <a href="index">Home</a>
     <a href="admin">Administration</a>
-    <!-- a class="button" href="reload" />Reload templates</a -->
+    <script type="text/javascript">
+        if ('«data.user.permissions»'.includes('admin')){
+            $('<a/>',{class:'button',href:'reload'}).text('Reload templates').appendTo($('nav'));
+        }
+    </script>
 </nav>