add two helper account access levels:

- read only - can't subscribe to more feeds, feed updates are skipped
 - disabled - can't login
define used access levels as UserHelper constants and refactor code to
use them instead of hardcoded numbers

js/App.js

@@ -17,6 +17,9 @@ const App = {
    hotkey_actions: {},
    is_prefs: false,
    LABEL_BASE_INDEX: -1024,
+	UserAccessLevels: {
+		ACCESS_LEVEL_READONLY: -1
+	},
    _translations: {},
    Hash: {
       get: function() {
@@ -76,10 +79,15 @@ const App = {
             </select>
          `
       },
-      select_hash: function(name, value, values = {}, attributes = {}, id = "") {
+      select_hash: function(name, value, values = {}, attributes = {}, id = "", params = {}) {
+			let keys = Object.keys(values);
+
+			if (params.numeric_sort)
+				keys = keys.sort((a,b) => a - b);
+
          return `
             <select name="${name}" dojoType="fox.form.Select" id="${App.escapeHtml(id)}" ${this.attributes_to_string(attributes)}>
-               ${Object.keys(values).map((vk) =>
+               ${keys.map((vk) =>
                      `<option ${vk == value ? 'selected="selected"' : ''} value="${App.escapeHtml(vk)}">${App.escapeHtml(values[vk])}</option>`
                ).join("")}
             </select>

js/CommonDialogs.js

@@ -131,6 +131,9 @@ const	CommonDialogs = {
 											console.log(rc);
 
 											switch (parseInt(rc['code'])) {
+												case 0:
+													dialog.show_error(__("You are already subscribed to this feed."));
+													break;
 												case 1:
 													dialog.hide();
 													Notify.info(__("Subscribed to %s").replace("%s", feed_url));
@@ -175,8 +178,11 @@ const	CommonDialogs = {
 												case 6:
 													dialog.show_error(__("XML validation failed: %s").replace("%s", rc['message']));
 													break;
-												case 0:
-													dialog.show_error(__("You are already subscribed to this feed."));
+												case 7:
+													dialog.show_error(__("Error while creating feed database entry."));
+													break;
+												case 8:
+													dialog.show_error(__("You are not allowed to perform this operation."));
 													break;
 											}
 
@@ -451,6 +457,7 @@ const	CommonDialogs = {
 
 				xhr.json("backend.php", {op: "pref-feeds", method: "editfeed", id: feed_id}, (reply) => {
 					const feed = reply.feed;
+					const is_readonly = reply.user.access_level == App.UserAccessLevels.ACCESS_LEVEL_READONLY;
 
 					// for unsub prompt
 					dialog.feed_title = feed.title;
@@ -524,7 +531,9 @@ const	CommonDialogs = {
 
 									<fieldset>
 										<label>${__("Update interval:")}</label>
-										${App.FormFields.select_hash("update_interval", feed.update_interval, reply.intervals.update)}
+										${App.FormFields.select_hash("update_interval", is_readonly ? -1 : feed.update_interval,
+											reply.intervals.update,
+											{disabled: is_readonly})}
 									</fieldset>
 									<fieldset>
 										<label>${__('Article purging:')}</label>

js/PrefUsers.js

@@ -75,7 +75,7 @@ const	Users = {
 									<fieldset>
 										<label>${__('Access level: ')}</label>
 										${App.FormFields.select_hash("access_level",
-											user.access_level, reply.access_level_names, {disabled: admin_disabled.toString()})}
+											user.access_level, reply.access_level_names, {disabled: admin_disabled.toString()}, "", {numeric_sort: true})}
 
 										${admin_disabled ? App.FormFields.hidden_tag("access_level",
 											user.access_level.toString()) : ''}