mutil domain support & split with comma

Signed-off-by: jerrylou <gunsluo@gmail.com>

README.md

@@ -69,10 +69,9 @@ docker pull timothyye/godns:1.0
 docker run -d --name godns --restart=always \
 -e EMAIL=your_dnspod_account \
 -e PASSWORD=your_dnspod_password \
--e DOMAIN=your_domain \
--e SUB_DOMAIN=your_sub_domain DOCKER_IMAGE_ID                                                                                              
+-e DOMAINS="your_domain1,your_domain2" DOCKER_IMAGE_ID                                                                                              
 ```
 
 
 
-## Enjoy it!
+## Enjoy it!

settings.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"strings"
 )
 
 type Domain struct {
@@ -41,13 +42,33 @@ func LoadSettings(configPath string, settings *Settings) error {
 	return nil
 }
 
-//LoadDomains -- Load domains from domains json
-func LoadDomains(domainsJson string, domains *[]Domain) error {
+//LoadDomains -- Load domains from domains string
+func LoadDomains(domainsOrginStr string, domains *[]Domain) error {
 
-	err := json.Unmarshal([]byte(domainsJson), domains)
-	if err != nil {
-		fmt.Println("Error occurs while unmarshal domains json, please make sure domains json config correct!")
-		return err
+	domainsMap := make(map[string]*Domain)
+	domainsArray := strings.Split(domainsOrginStr, ",")
+	for _, host := range domainsArray {
+		dotCount := strings.Count(host, ".")
+		if dotCount < 2 {
+			continue
+		}
+		len := len(host)
+		pos := strings.Index(host, ".")
+		subDomain := host[0:pos]
+		domainName := host[pos+1 : len]
+
+		if d, exist := domainsMap[domainName]; exist {
+			d.SubDomains = append(d.SubDomains, subDomain)
+		} else {
+			d := new(Domain)
+			d.DomainName = domainName
+			d.SubDomains = append(d.SubDomains, subDomain)
+			domainsMap[domainName] = d
+		}
+	}
+
+	for _, d := range domainsMap {
+		*domains = append(*domains, *d)
 	}
 
 	return nil