Check for boolean true in headers.fields for fetch()

lib/imap.js

@@ -961,19 +961,26 @@ ImapConnection.prototype._fetch = function(which, uids, options, what, cb) {
             headers = wp.headers;
           else if (typeof wp.headers === 'object') {
             if (!Array.isArray(wp.headers.fields)
-                && typeof wp.headers.fields !== 'string')
+                && typeof wp.headers.fields !== 'string'
+                && wp.headers.fields !== true)
               throw new Error('Invalid `fields` property');
             if (Array.isArray(wp.headers.fields))
               headers = wp.headers.fields;
+            else if (wp.headers.fields === true)
+              headers = true;
             else
               headers = [wp.headers.fields];
             if (wp.headers.parse === false)
               parse = false;
           } else
             throw new Error('Invalid `headers` value: ' + wp.headers);
-          key += 'HEADER.FIELDS (';
-          key += headers.join(' ').toUpperCase();
-          key += ')]';
+          if (headers === true)
+            key += 'HEADER]';
+          else {
+            key += 'HEADER.FIELDS (';
+            key += headers.join(' ').toUpperCase();
+            key += ')]';
+          }
         }
       } else if (wp.headersNot) {
         key = pprefix.trim();
@@ -984,19 +991,26 @@ ImapConnection.prototype._fetch = function(which, uids, options, what, cb) {
             headers = wp.headersNot;
           else if (typeof wp.headersNot === 'object') {
             if (!Array.isArray(wp.headersNot.fields)
-                && typeof wp.headersNot.fields !== 'string')
+                && typeof wp.headersNot.fields !== 'string'
+                && wp.headersNot.fields !== true)
               throw new Error('Invalid `fields` property');
             if (Array.isArray(wp.headersNot.fields))
               headers = wp.headersNot.fields;
+            else if (wp.headersNot.fields)
+              headers = true;
             else
               headers = [wp.headersNot.fields];
             if (wp.headersNot.parse === false)
               parse = false;
           } else
             throw new Error('Invalid `headersNot` value: ' + wp.headersNot);
-          key += 'HEADER.FIELDS.NOT (';
-          key += headers.join(' ').toUpperCase();
-          key += ')]';
+          if (headers === true)
+            key += 'HEADER]';
+          else {
+            key += 'HEADER.FIELDS.NOT (';
+            key += headers.join(' ').toUpperCase();
+            key += ')]';
+          }
         }
       }
       if (key) {