cmd: integrate invisible recaptcha into puppeth

cmd/faucet/faucet.html

@@ -77,7 +77,7 @@
 				<div class="row" style="margin-top: 32px;">
 					<div class="col-lg-12">
 						<h3>How does this work?</h3>
-						<p>This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to GitHub accounts. Anyone having a GitHub account may request funds within the permitted limit of <strong>{{.Amount}} Ether(s) / {{.Period}}</strong>.</p>
+						<p>This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to GitHub accounts. Anyone having a GitHub account may request funds within the permitted limit of <strong>{{.Amount}} Ether(s) / {{.Period}}</strong>.{{if .Recaptcha}} The faucet is running invisible reCaptcha protection against bots.{{end}}</p>
 						<p>To request funds, simply create a <a href="https://gist.github.com/" target="_about:blank">GitHub Gist</a> with your Ethereum address pasted into the contents (the file name doesn't matter), copy paste the gists URL into the above input box and fire away! You can track the current pending requests below the input field to see how much you have to wait until your turn comes.</p>
 					</div>
 				</div>
@@ -136,7 +136,6 @@
 					}
 				}
 				server.onclose = function() { setTimeout(reconnect, 3000); };
-				//server.onerror = function() { setTimeout(reconnect, 3000); };
 			}
 			// Establish a websocket connection to the API server
 			reconnect();

cmd/puppeth/module_faucet.go

@@ -54,6 +54,7 @@ CMD [ \
 	"/faucet", "--genesis", "/genesis.json", "--network", "{{.NetworkID}}", "--bootnodes", "{{.Bootnodes}}", "--ethstats", "{{.Ethstats}}",            \
 	"--ethport", "{{.EthPort}}", "--faucet.name", "{{.FaucetName}}", "--faucet.amount", "{{.FaucetAmount}}", "--faucet.minutes", "{{.FaucetMinutes}}", \
 	"--github.user", "{{.GitHubUser}}", "--github.token", "{{.GitHubToken}}", "--account.json", "/account.json", "--account.pass", "/account.pass"     \
+	{{if .CaptchaToken}}, "--captcha.token", "{{.CaptchaToken}}", "--captcha.secret", "{{.CaptchaSecret}}"{{end}}                                      \
 ]`
 
 // faucetComposefile is the docker-compose.yml file required to deploy and maintain
@@ -75,7 +76,9 @@ services:
       - FAUCET_AMOUNT={{.FaucetAmount}}
       - FAUCET_MINUTES={{.FaucetMinutes}}
       - GITHUB_USER={{.GitHubUser}}
-      - GITHUB_TOKEN={{.GitHubToken}}{{if .VHost}}
+      - GITHUB_TOKEN={{.GitHubToken}}
+      - CAPTCHA_TOKEN={{.CaptchaToken}}
+      - CAPTCHA_SECRET={{.CaptchaSecret}}{{if .VHost}}
       - VIRTUAL_HOST={{.VHost}}
       - VIRTUAL_PORT=8080{{end}}
     restart: always
@@ -97,6 +100,8 @@ func deployFaucet(client *sshClient, network string, bootnodes []string, config
 		"EthPort":       config.node.portFull,
 		"GitHubUser":    config.githubUser,
 		"GitHubToken":   config.githubToken,
+		"CaptchaToken":  config.captchaToken,
+		"CaptchaSecret": config.captchaSecret,
 		"FaucetName":    strings.Title(network),
 		"FaucetAmount":  config.amount,
 		"FaucetMinutes": config.minutes,
@@ -113,6 +118,8 @@ func deployFaucet(client *sshClient, network string, bootnodes []string, config
 		"EthName":       config.node.ethstats[:strings.Index(config.node.ethstats, ":")],
 		"GitHubUser":    config.githubUser,
 		"GitHubToken":   config.githubToken,
+		"CaptchaToken":  config.captchaToken,
+		"CaptchaSecret": config.captchaSecret,
 		"FaucetAmount":  config.amount,
 		"FaucetMinutes": config.minutes,
 	})
@@ -142,11 +149,13 @@ type faucetInfos struct {
 	minutes       int
 	githubUser    string
 	githubToken   string
+	captchaToken  string
+	captchaSecret string
 }
 
 // String implements the stringer interface.
 func (info *faucetInfos) String() string {
-	return fmt.Sprintf("host=%s, api=%d, eth=%d, amount=%d, minutes=%d, github=%s, ethstats=%s", info.host, info.port, info.node.portFull, info.amount, info.minutes, info.githubUser, info.node.ethstats)
+	return fmt.Sprintf("host=%s, api=%d, eth=%d, amount=%d, minutes=%d, github=%s, captcha=%v, ethstats=%s", info.host, info.port, info.node.portFull, info.amount, info.minutes, info.githubUser, info.captchaToken != "", info.node.ethstats)
 }
 
 // checkFaucet does a health-check against an faucet server to verify whether
@@ -206,5 +215,7 @@ func checkFaucet(client *sshClient, network string) (*faucetInfos, error) {
 		minutes:       minutes,
 		githubUser:    infos.envvars["GITHUB_USER"],
 		githubToken:   infos.envvars["GITHUB_TOKEN"],
+		captchaToken:  infos.envvars["CAPTCHA_TOKEN"],
+		captchaSecret: infos.envvars["CAPTCHA_SECRET"],
 	}, nil
 }

cmd/puppeth/wizard_faucet.go

@@ -71,7 +71,7 @@ func (w *wizard) deployFaucet() {
 	// Accessing GitHub gists requires API authorization, retrieve it
 	if infos.githubUser != "" {
 		fmt.Println()
-		fmt.Printf("Reused previous (%s) GitHub API authorization (y/n)? (default = yes)\n", infos.githubUser)
+		fmt.Printf("Reuse previous (%s) GitHub API authorization (y/n)? (default = yes)\n", infos.githubUser)
 		if w.readDefaultString("y") != "y" {
 			infos.githubUser, infos.githubToken = "", ""
 		}
@@ -109,6 +109,29 @@ func (w *wizard) deployFaucet() {
 			return
 		}
 	}
+	// Accessing the reCaptcha service requires API authorizations, request it
+	if infos.captchaToken != "" {
+		fmt.Println()
+		fmt.Println("Reuse previous reCaptcha API authorization (y/n)? (default = yes)")
+		if w.readDefaultString("y") != "y" {
+			infos.captchaToken, infos.captchaSecret = "", ""
+		}
+	}
+	if infos.captchaToken == "" {
+		// No previous authorization (or old one discarded)
+		fmt.Println()
+		fmt.Println("Enable reCaptcha protection against robots (y/n)? (default = no)")
+		if w.readDefaultString("n") == "y" {
+			// Captcha protection explicitly requested, read the site and secret keys
+			fmt.Println()
+			fmt.Printf("What is the reCaptcha site key to authenticate human users?\n")
+			infos.captchaToken = w.readString()
+
+			fmt.Println()
+			fmt.Printf("What is the reCaptcha secret key to verify authentications? (won't be echoed)\n")
+			infos.captchaSecret = w.readPassword()
+		}
+	}
 	// Figure out where the user wants to store the persistent data
 	fmt.Println()
 	if infos.node.datadir == "" {