add google handler

README.md

@@ -150,6 +150,29 @@ For DNSPod, you need to provide email & password,  and config all the domains &
   "socks5_proxy": ""
 }
 ```
+
+### Config example for Cloudflare
+
+For Cloudflare, you need to provide email & Global API Key as password, and config all the domains & subdomains.
+
+```json
+{
+  "provider": "Cloudflare",
+  "email": "you@example.com",
+  "password": "Global API Key",
+  "domains": [{
+      "domain_name": "example.com",
+      "sub_domains": ["www","test"]
+    },{
+      "domain_name": "example2.com",
+      "sub_domains": ["www","test"]
+    }
+  ],
+  "ip_url": "https://myip.biturl.top",
+  "interval": 300,
+  "socks5_proxy": ""
+}
+```
 ### Config example for AliDNS
 
 For AliDNS, you need to provide `AccessKeyID` & `AccessKeySecret` as `email` & `password`,  and config all the domains & subdomains.

handler/google/google_handler.go

@@ -0,0 +1,115 @@
+package google
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+	"runtime/debug"
+	"strings"
+	"time"
+
+	"github.com/TimothyYe/godns"
+
+	"golang.org/x/net/proxy"
+)
+
+var (
+	// GoogleUrl the API address for Google Domains
+	GoogleUrl = "https://domains.google.com/nic/update"
+)
+
+// Handler struct
+type Handler struct {
+	Configuration *godns.Settings
+}
+
+// SetConfiguration pass dns settings and store it to handler instance
+func (handler *Handler) SetConfiguration(conf *godns.Settings) {
+	handler.Configuration = conf
+}
+
+// DomainLoop the main logic loop
+func (handler *Handler) DomainLoop(domain *godns.Domain, panicChan chan<- godns.Domain) {
+	defer func() {
+		if err := recover(); err != nil {
+			log.Printf("Recovered in %v: %v\n", err, debug.Stack())
+			panicChan <- *domain
+		}
+	}()
+
+	var lastIP string
+
+	for {
+		currentIP, err := godns.GetCurrentIP(handler.Configuration)
+
+		if err != nil {
+			log.Println("get_currentIP:", err)
+			continue
+		}
+		log.Println("currentIP is:", currentIP)
+
+		//check against locally cached IP, if no change, skip update
+		if currentIP == lastIP {
+			log.Printf("IP is the same as cached one. Skip update.\n")
+		} else {
+			lastIP = currentIP
+
+			for _, subDomain := range domain.SubDomains {
+				log.Printf("%s.%s Start to update record IP...\n", subDomain, domain.DomainName)
+				handler.UpdateIP(domain.DomainName, subDomain, currentIP)
+
+				// Send mail notification if notify is enabled
+				if handler.Configuration.Notify.Enabled {
+					log.Print("Sending notification to:", handler.Configuration.Notify.SendTo)
+					if err := godns.SendNotify(handler.Configuration, fmt.Sprintf("%s.%s", subDomain, domain.DomainName), currentIP); err != nil {
+						log.Println("Failed to send notificaiton")
+					}
+				}
+			}
+		}
+		// Sleep with interval
+		log.Printf("Going to sleep, will start next checking in %d seconds...\r\n", handler.Configuration.Interval)
+		time.Sleep(time.Second * time.Duration(handler.Configuration.Interval))
+	}
+
+}
+
+// UpdateIP update subdomain with current IP
+func (handler *Handler) UpdateIP(domain, subDomain, currentIP string) {
+	values := url.Values{}
+	values.Add("hostname", fmt.Sprintf("%s.%s", subDomain, domain))
+	values.Add("username:password", fmt.Sprintf("%s:%s", handler.Configuration.Email, handler.Configuration.Password))
+	values.Add("myip", currentIP)
+
+	client := &http.Client{}
+
+	if handler.Configuration.Socks5Proxy != "" {
+		log.Println("use socks5 proxy:" + handler.Configuration.Socks5Proxy)
+		dialer, err := proxy.SOCKS5("tcp", handler.Configuration.Socks5Proxy, nil, proxy.Direct)
+		if err != nil {
+			log.Println("can't connect to the proxy:", err)
+			return
+		}
+
+		httpTransport := &http.Transport{}
+		client.Transport = httpTransport
+		httpTransport.Dial = dialer.Dial
+	}
+
+	req, _ := http.NewRequest("POST", GoogleUrl, strings.NewReader(values.Encode()))
+	resp, err := client.Do(req)
+
+	if err != nil {
+		log.Println("Request error...")
+		log.Println("Err:", err.Error())
+	} else {
+		body, _ := ioutil.ReadAll(resp.Body)
+		if resp.StatusCode == http.StatusOK {
+			log.Println("Update IP success:", string(body))
+		} else {
+			log.Println("Update IP failed:", string(body))
+		}
+	}
+}

handler/handler.go

@@ -5,6 +5,7 @@ import (
 	"github.com/TimothyYe/godns/handler/alidns"
 	"github.com/TimothyYe/godns/handler/cloudflare"
 	"github.com/TimothyYe/godns/handler/dnspod"
+	"github.com/TimothyYe/godns/handler/google"
 	"github.com/TimothyYe/godns/handler/he"
 )
 
@@ -27,6 +28,8 @@ func CreateHandler(provider string) IHandler {
 		handler = IHandler(&he.Handler{})
 	case godns.ALIDNS:
 		handler = IHandler(&alidns.Handler{})
+	case godns.GOOGLE:
+		handler = IHandler(&google.Handler{})
 	}
 
 	return handler

utils.go

@@ -42,6 +42,8 @@ const (
 	CLOUDFLARE = "Cloudflare"
 	// ALIDNS for AliDNS
 	ALIDNS = "AliDNS"
+	// GOOGLE for Google Domains
+	GOOGLE = "Google"
 )
 
 //GetIPFromInterface gets IP address from the specific interface