Add backend files

2 files changed, 112 insertions, 0 deletions

diff --git a/lib/forum.js b/lib/forum.js
new file mode 100644
index 0000000..0253b3d
--- /dev/null
+++ b/lib/forum.js
@@ -0,0 +1,87 @@
+import Koa from 'koa';
+
+import HandleErrors from './middleware/handle_errors.js';
+import KoaSend from 'koa-send';
+import KoaStatic from 'koa-static';
+import Path from 'path';
+
+/**
+ * The Forum class is the main entry point for the backend application.
+ *
+ * @param {tForumBackendConfiguration} config the initialization options to
+ * extend the instance
+ */
+export default class Forum {
+
+  constructor(config) {
+
+    Object.assign(this, config);
+  }
+
+  /**
+   * Initializes the application and starts listening. Also prints a
+   * nice robotic banner with information.
+   */
+  run() {
+
+    this._initializeServer();
+    this._startServer();
+    this._printBanner();
+
+    return Promise.resolve();
+  }
+
+  // Initializes the Koa application and all the handlers.
+
+  _initializeServer() {
+
+    const self = this;
+
+    this._app = new Koa();
+    this._app.use(KoaStatic(this.staticDirectory));
+
+    // Error handler
+
+    this._app.use(HandleErrors);
+
+    this._initializePostsRoutes();
+
+    this._app.use(async function () {
+
+      await KoaSend(this, Path.join(self.staticDirectory, 'index.html'));
+    });
+
+  }
+
+  // Initialize routes for posts
+
+  _initializePostsRoutes() {
+
+    // Under construction
+  }
+
+
+  // Starts listening
+
+  _startServer() {
+
+    this._app.listen(this.port);
+  }
+
+  // Prints the banner.
+
+  _printBanner() {
+
+    console.log('        .');
+    console.log('       /');
+    console.log('    +-----+');
+    console.log(`    | o o |  - Listening Gladly, Try me on port: ${this.port}`);
+    console.log('    +-----+');
+    console.log('  +---------+');
+    console.log(' /|    [][] |\\');
+    console.log(' ||         | |');
+    console.log(' ||         |  \\c');
+    console.log(' ^+---------+');
+    console.log('      (.) ');
+  }
+};
diff --git a/lib/middleware/handle_errors.js b/lib/middleware/handle_errors.js
new file mode 100644
index 0000000..f969676
--- /dev/null
+++ b/lib/middleware/handle_errors.js
@@ -0,0 +1,25 @@
+/**
+ * Middleware to create responses for unhandled errors.
+ */
+export default async function HandleErrors(next) {
+
+  try {
+    await next;
+  }
+  catch (err) {
+    this.status = err.status || 500;
+
+    const response = {
+      error: err.message,
+      status: this.status
+    };
+
+    if (response.status === 401) {
+      response.error === 'Protected resource, use Authorization header to get access';
+    }
+
+    this.body = response;
+
+    this.app.emit('error', err, this);
+  }
+}