Connection: ensure non-empty seqno/uid lists

lib/Connection.js

@@ -484,8 +484,11 @@ Connection.prototype.expunge = function(uids, cb) {
   if (uids !== undefined) {
     if (!Array.isArray(uids))
       uids = [uids];
-
     validateUIDList(uids);
+
+    if (uids.length === 0)
+      throw new Error('Empty uid list');
+
     uids = uids.join(',');
 
     if (!this.serverSupports('UIDPLUS'))
@@ -560,6 +563,12 @@ Connection.prototype._store = function(which, uids, cfg, cb) {
     uids = [uids];
   validateUIDList(uids);
 
+  if (uids.length === 0) {
+    throw new Error('Empty '
+                    + (which === '' ? 'sequence number' : 'uid')
+                    + 'list');
+  }
+
   if ((!Array.isArray(items) && typeof items !== 'string')
       || (Array.isArray(items) && items.length === 0))
     throw new Error((isFlags ? 'Flags' : 'Keywords')
@@ -602,8 +611,14 @@ Connection.prototype._copy = function(which, uids, boxTo, cb) {
 
   if (!Array.isArray(uids))
     uids = [uids];
-
   validateUIDList(uids);
+
+  if (uids.length === 0) {
+    throw new Error('Empty '
+                    + (which === '' ? 'sequence number' : 'uid')
+                    + 'list');
+  }
+
   boxTo = escape(utf7.encode(''+boxTo));
 
   this._enqueue(which + 'COPY ' + uids.join(',') + ' "' + boxTo + '"', cb);
@@ -620,8 +635,14 @@ Connection.prototype._move = function(which, uids, boxTo, cb) {
   if (this.serverSupports('MOVE')) {
     if (!Array.isArray(uids))
       uids = [uids];
-
     validateUIDList(uids);
+
+    if (uids.length === 0) {
+      throw new Error('Empty '
+                      + (which === '' ? 'sequence number' : 'uid')
+                      + 'list');
+    }
+
     uids = uids.join(',');
     boxTo = escape(utf7.encode(''+boxTo));
 
@@ -703,6 +724,13 @@ Connection.prototype._fetch = function(which, uids, options) {
   if (!Array.isArray(uids))
     uids = [uids];
   validateUIDList(uids);
+
+  if (uids.length === 0) {
+    throw new Error('Empty '
+                    + (which === '' ? 'sequence number' : 'uid')
+                    + 'list');
+  }
+
   uids = uids.join(',');
 
   var cmd = which + 'FETCH ' + uids + ' (',
@@ -791,6 +819,12 @@ Connection.prototype._storeLabels = function(which, uids, labels, mode, cb) {
     uids = [uids];
   validateUIDList(uids);
 
+  if (uids.length === 0) {
+    throw new Error('Empty '
+                    + (which === '' ? 'sequence number' : 'uid')
+                    + 'list');
+  }
+
   if ((!Array.isArray(labels) && typeof labels !== 'string')
       || (Array.isArray(labels) && labels.length === 0))
     throw new Error('labels argument must be a string or a non-empty Array');
@@ -1814,6 +1848,8 @@ function buildSearchQuery(options, extensions, info, isOrChild) {
             throw new Error('Incorrect number of arguments for search option: '
                             + criteria);
           validateUIDList(args);
+          if (args.length === 0)
+            throw new Error('Empty uid list');
           searchargs += modifier + criteria + ' ' + args.join(',');
         break;
         // Extensions ==========================================================
@@ -1862,9 +1898,11 @@ function buildSearchQuery(options, extensions, info, isOrChild) {
           // last hope it's a seqno set
           // http://tools.ietf.org/html/rfc3501#section-6.4.4
           var seqnos = (args ? [criteria].concat(args) : [criteria]);
-          if (!validateUIDList(seqnos, true))
+          if (!validateUIDList(seqnos, true)) {
+            if (seqnos.length === 0)
+              throw new Error('Empty sequence number list');
             searchargs += modifier + seqnos.join(',');
-          else
+          } else
             throw new Error('Unexpected search option: ' + criteria);
       }
     }