Add "web" Flag for Launching OAuth2l Playground (#103)

This is an experimental feature that will install and launch "oauth2l-web", an interactive web-app version of oauth2l.

integration/golden/no-command.golden

@@ -1 +1 @@
-Please specify one command of: curl, fetch, header, info, reset or test
+Please specify one command of: curl, fetch, header, info, reset, test or web

main.go

@@ -50,6 +50,7 @@ type commandOptions struct {
 	Info   infoOptions   `command:"info" description:"Display info about an OAuth access token."`
 	Test   infoOptions   `command:"test" description:"Tests an OAuth access token. Returns 0 for valid token."`
 	Reset  resetOptions  `command:"reset" description:"Resets the cache."`
+	Web    webOptions    `command:"web"   description:"Launches a local instance of the OAuth2l Playground web app. This feature is experimental."`
 }
 
 // Common options for "fetch", "header", and "curl" commands.
@@ -114,6 +115,12 @@ type resetOptions struct {
 	Cache *string `long:"cache" description:"Path to the credential cache file to remove. Defaults to ~/.oauth2l."`
 }
 
+// Options for "web" command
+type webOptions struct {
+	// Stop the web app
+	Stop bool `long:"stop" description:"Stops the OAuth2l Playground."`
+}
+
 // Reads and returns content of JSON file.
 func readJSON(file string) (string, error) {
 	if file != "" {
@@ -370,6 +377,13 @@ func main() {
 		}
 
 		os.Exit(task(token))
+	} else if cmd == "web" {
+		if opts.Web.Stop {
+			util.WebStop()
+		} else {
+			util.Web()
+		}
+
 	} else if cmd == "reset" {
 		setCacheLocation(opts.Reset.Cache)
 		util.Reset()

util/web.go

@@ -0,0 +1,102 @@
+//
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package util
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"runtime"
+	"strings"
+)
+
+const (
+	defaultServer = "http://localhost:3000/"
+)
+
+var location string = "~/.oauth2l-web"
+
+// Runs the frontend/backend for OAuth2l Playground
+func Web() {
+	_, err := os.Stat("~/.oauth2l-web")
+	if os.IsNotExist(err) {
+		var decision string
+		fmt.Println("The Web feature will be installed in ~/.oauth2l-web. Would you like to change the directory? (y/n)")
+		fmt.Scanln(&decision)
+		decision = strings.ToLower(decision)
+		if decision == "y" || decision == "yes" {
+			fmt.Println("Enter new directory location")
+			fmt.Scanln(&location)
+		}
+		fmt.Println("Installing...")
+		cmd := exec.Command("git", "clone", "https://github.com/googleinterns/oauth2l-web.git", location)
+		clonErr := cmd.Run()
+		if clonErr != nil {
+			log.Fatal(clonErr.Error())
+		} else {
+			fmt.Println("Web feature installed")
+		}
+	}
+	cmd := exec.Command("docker-compose", "up", "-d", "--build")
+	cmd.Dir = location
+
+	dockErr := cmd.Run()
+
+	if dockErr != nil {
+		fmt.Println("Check to see if Docker is running!")
+		log.Fatal(dockErr.Error())
+
+	} else {
+		openWeb()
+	}
+}
+
+// opens the website on the default browser
+func openWeb() error {
+	var cmd string
+
+	switch runtime.GOOS {
+	case "darwin":
+		cmd = "open"
+	case "linux":
+		cmd = "xdg-open"
+	case "windows":
+		cmd = "start"
+	default:
+		cmd = "Not currently supported"
+	}
+
+	return exec.Command(cmd, defaultServer).Start()
+}
+
+// closes the containers and removes stopped containers
+func WebStop() {
+	cmd := exec.Command("docker-compose", "stop")
+	cmd.Dir = location
+	err := cmd.Run()
+	if err != nil {
+		log.Fatal(err.Error())
+	}
+
+	remContainer := exec.Command("docker-compose", "rm", "-f")
+	remContainer.Dir = location
+	remErr := remContainer.Run()
+	if remErr != nil {
+		log.Fatal(err.Error())
+	}
+
+	fmt.Println("OAuth2l Playground was stopped.")
+}