Fix heading content to not include stack

fixes #10

Author: dougwilson

HISTORY.md

@@ -1,3 +1,8 @@
+unreleased
+==========
+
+  * Fix heading content to not include stack
+
 1.2.3 / 2014-11-21
 ==================
 

index.js

@@ -19,7 +19,9 @@ var util = require('util')
  * Module variables.
  */
 
+var doubleSpaceGlobalRegExp = /  /g
 var inspect = util.inspect
+var newLineGlobalRegExp = /\n/g
 var toString = Object.prototype.toString
 
 /**
@@ -85,17 +87,25 @@ exports = module.exports = function errorHandler(){
         if (e) return next(e);
         fs.readFile(__dirname + '/public/error.html', 'utf8', function(e, html){
           if (e) return next(e);
-          var stack = String(err.stack || '')
-            .split('\n').slice(1)
-            .map(function(v){ return '<li>' + escapeHtml(v).replace(/  /g, ' &nbsp;') + '</li>'; }).join('');
-            html = html
-              .replace('{style}', style)
-              .replace('{stack}', stack)
-              .replace('{title}', escapeHtml(exports.title))
-              .replace('{statusCode}', res.statusCode)
-              .replace(/\{error\}/g, escapeHtml(stringify(err)).replace(/  /g, ' &nbsp;').replace(/\n/g, '<br>'));
-            res.setHeader('Content-Type', 'text/html; charset=utf-8');
-            res.end(html);
+          var str = stringify(err)
+          var isInspect = !err.stack && String(err) === toString.call(err)
+          var errorHtml = !isInspect
+            ? escapeHtmlBlock(str.split('\n', 1)[0] || 'Error')
+            : 'Error'
+          var stack = !isInspect
+            ? String(str).split('\n').slice(1)
+            : [str]
+          var stackHtml = stack
+            .map(function (v) { return '<li>' + escapeHtmlBlock(v) + '</li>' })
+            .join('')
+          var body = html
+            .replace('{style}', style)
+            .replace('{stack}', stackHtml)
+            .replace('{title}', escapeHtml(exports.title))
+            .replace('{statusCode}', res.statusCode)
+            .replace(/\{error\}/g, errorHtml)
+          res.setHeader('Content-Type', 'text/html; charset=utf-8')
+          res.end(body)
         });
       });
     // json
@@ -119,6 +129,17 @@ exports = module.exports = function errorHandler(){
 
 exports.title = 'Connect';
 
+/**
+ * Escape a block of HTML, preserving whitespace.
+ * @api private
+ */
+
+function escapeHtmlBlock(str) {
+  return escapeHtml(str)
+  .replace(doubleSpaceGlobalRegExp, ' &nbsp;')
+  .replace(newLineGlobalRegExp, '<br>')
+}
+
 /**
  * Stringify a value.
  * @api private

test/test.js

@@ -58,9 +58,9 @@ describe('errorHandler()', function () {
       .get('/')
       .set('Accept', 'text/html')
       .expect('Content-Type', /text\/html/)
-      .expect(/<title>/)
-      .expect(/Error: boom!/)
-      .expect(/ &nbsp; &nbsp;at/)
+      .expect(/<title>Error: boom!<\/title>/)
+      .expect(/<h2><em>500<\/em> Error: boom!<\/h2>/)
+      .expect(/<li> &nbsp; &nbsp;at/)
       .end(done)
     });