From 2527ec2a95093ea2a2c8055851dbb6d8502ac4e8 Mon Sep 17 00:00:00 2001
From: Edward Thomson <ethomson@edwardthomson.com>
Date: Wed, 15 Aug 2018 18:28:35 +0100
Subject: [PATCH] calculator: REST API to perform simple arithmetic

A simple REST API that can perform simple arithmetic, the type that you
might find from a pocket calculator.  (It adds, subtracts, controls and
composes.)
---
 .gitignore                              |   2 +
 LICENSE                                 |  19 ++
 api/controllers/arithmeticController.js |  50 ++++
 api/models/arithmeticModel.js           |   0
 api/routes.js                           |   5 +
 package-lock.json                       | 373 ++++++++++++++++++++++++
 package.json                            |  29 ++
 server.js                               |  12 +
 8 files changed, 490 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 api/controllers/arithmeticController.js
 create mode 100644 api/models/arithmeticModel.js
 create mode 100644 api/routes.js
 create mode 100644 package-lock.json
 create mode 100644 package.json
 create mode 100644 server.js

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..39e1ee9240
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.npm
+node_modules/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..64d49205b4
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) Microsoft Corporation. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/api/controllers/arithmeticController.js b/api/controllers/arithmeticController.js
new file mode 100644
index 0000000000..b67886a8c4
--- /dev/null
+++ b/api/controllers/arithmeticController.js
@@ -0,0 +1,50 @@
+'use strict';
+
+exports.calculate = function(req, res) {
+  req.app.use(function(err, req, res, next) {
+    if (res.headersSent) {
+      return next(err);
+    }
+
+    res.status(400);
+    res.json({ error: err.message });
+  });
+
+  var operations = {
+    'add':      function(a,b) { return +a + +b },
+    'subtract': function(a,b) { return a - b },
+    'multiply': function(a,b) { return a * b },
+    'divide':   function(a,b) { return a / b },
+  };
+
+  // Determine the operation
+
+  if (! req.query.operation) {
+    throw new Error("Unspecified operation");
+  }
+
+  var operation = operations[req.query.operation];
+
+  if (! operation) {
+    throw new Error("Invalid operation: " + req.query.operation);
+  }
+
+  // Validate operands
+
+  if (! req.query.operand1 ||
+      ! req.query.operand1.match(/^(-)?[0-9\.]+$/) ||
+      req.query.operand1.replace(/[-0-9]/g, '').length > 1) {
+    throw new Error("Invalid operand1: " + req.query.operand1);
+  }
+
+  if (! req.query.operand2 ||
+      ! req.query.operand2.match(/^(-)?[0-9\.]+$/) ||
+      req.query.operand2.replace(/[-0-9]/g, '').length > 1) {
+    throw new Error("Invalid operand2: " + req.query.operand2);
+  }
+
+  var operand1 = parseInt(req.query.operand1, 10);
+  var operand2 = parseInt(req.query.operand2, 10);
+
+  res.json({ result: operation(req.query.operand1, req.query.operand2) });
+};
diff --git a/api/models/arithmeticModel.js b/api/models/arithmeticModel.js
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/api/routes.js b/api/routes.js
new file mode 100644
index 0000000000..674f7219e9
--- /dev/null
+++ b/api/routes.js
@@ -0,0 +1,5 @@
+module.exports = function(app) {
+  var arithmetic = require("./controllers/arithmeticController");
+
+  app.route("/arithmetic").get(arithmetic.calculate);
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000000..04805fbfdc
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,373 @@
+{
+  "name": "calculator",
+  "version": "1.0.0",
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+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.18"
+      }
+    },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000000..32532d6eeb
--- /dev/null
+++ b/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "calculator",
+  "version": "1.0.0",
+  "description": "Calculator",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/azure-pipelines-samples/node.js"
+  },
+  "main": "index.js",
+  "scripts": {
+    "start": "node server.js",
+    "build": "exit 0",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "azure",
+    "pipelines",
+    "devops",
+    "vsts",
+    "ci",
+    "cd"
+  ],
+  "author": "Edward Thomson <ethomson@microsoft.com>",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.16.3"
+  },
+  "devDependencies": {}
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000000..3df732c25a
--- /dev/null
+++ b/server.js
@@ -0,0 +1,12 @@
+var express = require('express'),
+  app = express(),
+  port = 3000;
+
+var routes = require("./api/routes");
+routes(app);
+
+if (! module.parent) {
+  app.listen(port);
+}
+
+console.log("Server running on port " + port);