From e8797a9cbacd06dbf573ac5a343c4c1322c244f3 Mon Sep 17 00:00:00 2001
From: Kevin Delisle <delisle@ca.ibm.com>
Date: Mon, 2 Oct 2017 15:58:12 -0400
Subject: [PATCH] feat(core): App-level configuration method

app.config will bind all first and second level properties for
retrieval via injection or .get methods
---
 packages/core/src/application.ts            | 32 +++++++++++++++++++++
 packages/core/test/unit/application.test.ts | 27 +++++++++++++++++
 2 files changed, 59 insertions(+)

diff --git a/packages/core/src/application.ts b/packages/core/src/application.ts
index 153205341a25..6df5048657b6 100644
--- a/packages/core/src/application.ts
+++ b/packages/core/src/application.ts
@@ -19,6 +19,8 @@ export class Application extends Context {
     // Make options available to other modules as well.
     this.bind(CoreBindings.APPLICATION_CONFIG).to(options);
 
+    this.config(options);
+
     if (options.components) {
       for (const component of options.components) {
         this.component(component);
@@ -161,6 +163,36 @@ export class Application extends Context {
     );
   }
 
+  // tslint:disable-next-line:no-any
+  private config(cfg: {[key: string]: any}) {
+    for (const key in cfg) {
+      const item = cfg[key];
+      // Iterate through the keys one level down (not recursively!)
+      if (item instanceof Object) {
+        for (const subkey in item) {
+          this.bindItemOrClass(`${key}.${subkey}`, item[subkey]);
+        }
+      }
+      this.bindItemOrClass(key, item);
+    }
+  }
+  /**
+   * Helper function for either binding an item or a class, depending.
+   * @private
+   * @param key The key of the configuration element.
+   * @param itemOrClass The item or class to bind.
+   */
+  // tslint:disable-next-line:no-any
+  private bindItemOrClass(key: string, itemOrClass: any) {
+    if (itemOrClass instanceof Function) {
+      this.bind(key)
+        .toClass(itemOrClass)
+        .inScope(BindingScope.SINGLETON);
+    } else {
+      this.bind(key).to(itemOrClass);
+    }
+  }
+
   /**
    * Add a component to this application.
    *
diff --git a/packages/core/test/unit/application.test.ts b/packages/core/test/unit/application.test.ts
index c4d0f542483e..facad401580f 100644
--- a/packages/core/test/unit/application.test.ts
+++ b/packages/core/test/unit/application.test.ts
@@ -26,6 +26,33 @@ describe('Application', () => {
   });
 
   describe('configuration', () => {
+    it('allows bindings to be set via config method', async () => {
+      // tslint:disable-next-line:no-any
+      const samoflange: any = {
+        vertices: 'many',
+        usefulness: 0,
+      };
+      const app = new Application({
+        magicCode: 'foobar',
+        servers: {
+          abc123: FakeServer,
+        },
+        CustomComponentCo: {
+          samoflange: samoflange,
+        },
+      });
+      const code = await app.get('magicCode');
+      const server = (await app.getServer('abc123')) as FakeServer;
+      expect(code).to.equal('foobar');
+      expect(server.constructor.name).to.equal(FakeServer.name);
+      const samo = await app.get('CustomComponentCo.samoflange');
+      for (const key in samo) {
+        expect(samo[key]).to.equal(samoflange[key]);
+      }
+      const vertices = await app.get('CustomComponentCo.samoflange#vertices');
+      expect(vertices).to.equal('many');
+    });
+
     it('allows servers to be provided via config', async () => {
       const name = 'abc123';
       const app = new Application({