Configurable dir for components and middleware

Add two new options `middlewareRootDir` and `componentRootDir`
allowing users to load middleware and/or components from a custom
place

index.js

@@ -110,6 +110,10 @@ var addInstructionsToBrowserify = require('./lib/bundler');
  * `model-config.json`. Defaults to `appRootDir`.
  * @property {String} [dsRootDir] Directory to use when loading
  * `datasources.json`. Defaults to `appRootDir`.
+ * @property {String} [middlewareRootDir] Directory to use when loading
+ * `middleware.json`. Defaults to `appRootDir`.
+ * @property {String} [componentRootDir] Directory to use when loading
+ * `component-config.json`. Defaults to `appRootDir`.
  * @property {String} [env] Environment type, defaults to `process.env.NODE_ENV`
  * or `development`. Common values are `development`, `staging` and
  * `production`; however the applications are free to use any names.

lib/compiler.js

@@ -52,15 +52,14 @@ module.exports = function compile(options) {
     ConfigLoader.loadDataSources(dsRootDir, env);
   assertIsValidConfig('data source', dataSourcesConfig);
 
-  // not configurable yet
+  var middlewareRootDir = options.middlewareRootDir || appRootDir;
-  var middlewareRootDir = appRootDir;
 
   var middlewareConfig = options.middleware ||
     ConfigLoader.loadMiddleware(middlewareRootDir, env);
   var middlewareInstructions =
     buildMiddlewareInstructions(middlewareRootDir, middlewareConfig);
 
-  var componentRootDir = appRootDir; // not configurable yet
+  var componentRootDir = options.componentRootDir || appRootDir;
   var componentConfig = options.components ||
       ConfigLoader.loadComponents(componentRootDir, env);
   var componentInstructions =

test/compiler.test.js

@@ -1595,6 +1595,39 @@ describe('compiler', function() {
         sourceFileForUrlNotFound);
     });
 
+    it('supports `middlewareRootDir` option', function() {
+      var middlewareJson = {
+        initial: {},
+        custom: {
+          'loopback/server/middleware/url-not-found': {
+            params: 'some-config-data',
+          },
+        },
+      };
+      var customDir = path.resolve(appdir.PATH, 'custom');
+      fs.mkdirsSync(customDir);
+      fs.writeJsonSync(path.resolve(customDir, 'middleware.json'),
+        middlewareJson);
+
+      var instructions = boot.compile({
+        appRootDir: appdir.PATH,
+        middlewareRootDir: path.resolve(appdir.PATH, 'custom'),
+      });
+
+      expect(instructions.middleware).to.eql({
+        phases: ['initial', 'custom'],
+        middleware: [
+          {
+            sourceFile: sourceFileForUrlNotFound,
+            config: {
+              phase: 'custom',
+              params: 'some-config-data',
+            },
+          },
+        ],
+      });
+    });
+
     it('fails when a module middleware cannot be resolved', function() {
       appdir.writeConfigFileSync('middleware.json', {
         final: {
@@ -2238,6 +2271,30 @@ describe('compiler', function() {
       });
     });
 
+    it('supports `componentRootDir` option', function() {
+      var componentJson = {
+        debug: {
+          option: 'value',
+        },
+      };
+      var customDir = path.resolve(appdir.PATH, 'custom');
+      fs.mkdirsSync(customDir);
+      fs.writeJsonSync(
+        path.resolve(customDir, 'component-config.json'), componentJson);
+
+      var instructions = boot.compile({
+        appRootDir: appdir.PATH,
+        componentRootDir: path.resolve(appdir.PATH, 'custom'),
+      });
+      var component = instructions.components[0];
+      expect(component).to.eql({
+        sourceFile: require.resolve('debug'),
+        config: {
+          option: 'value',
+        },
+      });
+    });
+
     it('loads component relative to appRootDir', function() {
       appdir.writeConfigFileSync('./component-config.json', {
         './index': { },