serve 404 when not possible key

TODO

@@ -1,6 +1,5 @@
 cache headers for static assets (and on document GET)
 tests
-add FAVICON (or force 404)
 add feedback for errors to UI - esp. too long
 add about page
 

lib/document_handler.js

@@ -78,6 +78,11 @@ DocumentHandler.prototype.chooseKey = function(callback) {
   }); 
 };
 
+// Return a boolean indicating whether or not something can be a key
+DocumentHandler.potentialKey = function(key) {
+  return key.match(/^[a-zA-Z0-9]+$/);
+};
+
 // Generate a random key
 DocumentHandler.prototype.randomKey = function() {
   var text = '';

lib/static_handler.js

@@ -3,6 +3,8 @@ var fs = require('fs');
 
 var winston = require('winston');
 
+var DocumentHandler = require('./document_handler');
+
 // For serving static assets
 
 var StaticHandler = function(path, cacheAssets) {
@@ -33,27 +35,28 @@ StaticHandler.contentTypeFor = function(ext) {
 
 // Handle a request, and serve back the asset if it exists
 StaticHandler.prototype.handle = function(incPath, response) {
-  // Go to index if not found or /
-  if (!this.availablePaths[incPath]) incPath = this.defaultPath;
-  var filePath = this.basePath + (incPath == '/' ? this.defaultPath : incPath);
-  // And then stream the file back - either from the cache or from source
-  var cached = this.cacheAssets && this.isCached(filePath);
-  var method = cached ? this.serveCached : this.retrieve;
-  // Run!
-  var _this = this;
-  method(filePath, function(error, content) {
-    // Get the content
-    if (content) {
-      var contentType = StaticHandler.contentTypeFor(path.extname(filePath));
-      response.writeHead(200, { 'content-type': contentType });
-      response.end(content, 'utf-8');
-      // Stick it in the cache if its not in there
-      if (!cached && _this.cacheAssets) {
-        StaticHandler.cache[filePath] = content;
-      }
+  // If this is a potential key, show the index - otherwise
+  // bust out a 404
+  if (!this.availablePaths[incPath]) {
+    if (incPath === '/' || DocumentHandler.potentialKey(incPath.substring(1))) {
+      incPath = this.defaultPath;
     }
-    // Or break down and cry
     else {
+      winston.warn('failed to find static asset', { path: incPath });
+      response.writeHead(404, { 'content-type': 'application/json' });
+      response.end(JSON.stringify({ message: 'no such file' }));
+      return;
+    }
+  }
+  // And then stream the file back - either from the cache or from source
+  var filePath = this.basePath + (incPath == '/' ? this.defaultPath : incPath);
+  var cached = this.cacheAssets && this.isCached(filePath);
+  // Go get'er
+  var _this = this;
+  var method = cached ? this.serveCached : this.retrieve;
+  method(filePath, function(error, content) {
+    // detect errors
+    if (error) {
       winston.error('unable to read file', { path: filePath, error: error });
       response.writeHead(500, { 'content-type': 'application/json' });
       response.end(JSON.stringify({ message: 'IO: Unable to read file' }));
@@ -62,6 +65,16 @@ StaticHandler.prototype.handle = function(incPath, response) {
         StaticHandler.cache[filePath] = null;
       }
     }
+    // Get the content
+    else {
+      var contentType = StaticHandler.contentTypeFor(path.extname(filePath));
+      response.writeHead(200, { 'content-type': contentType });
+      response.end(content, 'utf-8');
+      // Stick it in the cache if its not in there
+      if (!cached && _this.cacheAssets) {
+        StaticHandler.cache[filePath] = content;
+      }
+    }
   }); 
 };
 
@@ -71,7 +84,7 @@ StaticHandler.prototype.retrieve = function(filePath, callback) {
   winston.verbose('loading static asset', { path: filePath });
   fs.readFile(filePath, function(error, content) {
     callback(error, content);
-  });    
+  });
 };
 
 // Retrieve from memory cache