implement GET_LIMITS admin rpc

...and label stored usage limits according to their source

lib/commands/admin-rpc.js

@@ -225,6 +225,11 @@ var instanceStatus = function (Env, Server, cb) {
     });
 };
 
+// CryptPad_AsyncStore.rpc.send('ADMIN', ['LIST_LIMITS'], console.log)
+var getLimits = function (Env, Server, cb) {
+    cb(void 0, Env.limits);
+};
+
 var commands = {
     ACTIVE_SESSIONS: getActiveSessions,
     ACTIVE_PADS: getActiveChannelCount,
@@ -241,6 +246,7 @@ var commands = {
 
     ADMIN_DECREE: adminDecree,
     INSTANCE_STATUS: instanceStatus,
+    GET_LIMITS: getLimits,
 };
 
 Admin.command = function (Env, safeKey, data, _cb, Server) {

lib/commands/quota.js

@@ -8,7 +8,7 @@ const Package = require('../../package.json');
 const Https = require("https");
 const Util = require("../common-util");
 
-var validLimitFields = ['limit', 'plan', 'note', 'users'];
+var validLimitFields = ['limit', 'plan', 'note', 'users', 'origin'];
 
 Quota.isValidLimit = function (o) {
     var valid = o && typeof(o) === 'object' &&
@@ -137,7 +137,14 @@ Quota.updateCachedLimits = function (Env, cb) {
         if (err) { return void cb(err); }
         if (!json) { return void cb(); }
 
+        for (var k in json) {
+            if (k.length === 44 && json[k]) {
+                json[k].origin = 'remote';
+            }
+        }
+
         Env.limits = json;
+
         Quota.applyCustomLimits(Env);
         cb();
     });

lib/decrees.js

@@ -106,6 +106,7 @@ commands.SET_QUOTA = function (Env, args) {
         throw new Error("INVALID_ARGS");
     }
 
+    limit.origin = 'decree';
     // map the new limit to the user's unsafeKey
     Env.customLimits[unsafeKey] = limit;
     Env.limits[unsafeKey] = limit;

lib/historyKeeper.js

@@ -79,6 +79,15 @@ module.exports.create = function (config, cb) {
         domain: config.domain
     };
 
+    (function () {
+        var custom = Env.customLimits;
+        for (var k in custom) {
+            if (k.length === 44 && custom[k]) {
+                custom.origin = 'config';
+            }
+        }
+    }());
+
     (function () {
         var pes = config.premiumUploadSize;
         if (!isNaN(pes) && pes >= Env.maxUploadSize) {