added support for wildcard certificates

.gitignore

@@ -13,4 +13,5 @@
 # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
 .glide/
 
-letsencrypt
+letsencrypt
+simplecert

examples/simple/main.go

@@ -14,5 +14,5 @@ func main() {
 		w.Write([]byte("hello"))
 	})
 
-	log.Fatal(simplecert.ListenAndServeTLSLocal(":443", nil, "myawesomewebsite.com"))
+	log.Fatal(simplecert.ListenAndServeTLSLocal(":443", nil, "*.myawesomewebsite.com"))
 }

local.go

@@ -15,6 +15,7 @@ import (
 	"log"
 	"os"
 	"strconv"
+	"strings"
 
 	"github.com/lextoumbourou/goodhosts"
 )
@@ -57,13 +58,21 @@ func createLocalCert(certFilePath, keyFilePath string) {
 	var (
 		newCertFile string
 		newKeyFile  string
+
+		firstDomain = c.Domains[0]
 	)
+
+	if strings.HasPrefix(firstDomain, "*") {
+		firstDomain = strings.TrimPrefix(firstDomain, "*")
+		firstDomain = "_wildcard" + firstDomain
+	}
+
 	if len(c.Domains) > 1 {
-		newCertFile = c.Domains[0] + "+" + strconv.Itoa(len(c.Domains)-1) + ".pem"
-		newKeyFile = c.Domains[0] + "+" + strconv.Itoa(len(c.Domains)-1) + "-key.pem"
+		newCertFile = firstDomain + "+" + strconv.Itoa(len(c.Domains)-1) + ".pem"
+		newKeyFile = firstDomain + "+" + strconv.Itoa(len(c.Domains)-1) + "-key.pem"
 	} else {
-		newCertFile = c.Domains[0] + ".pem"
-		newKeyFile = c.Domains[0] + "-key.pem"
+		newCertFile = firstDomain + ".pem"
+		newKeyFile = firstDomain + "-key.pem"
 	}
 
 	// rename certificate file

simplecert/simplecert.log

@@ -1,10 +0,0 @@
-2019/02/21 17:35:31 [INFO] simplecert: checking if cacheDir simplecert/local exists...
-2019/02/21 17:35:31 [INFO] simplecert: cacheDir does not exist - creating it
-2019/02/21 17:35:31 [INFO] no cached cert found. Creating a new one for local development...
-2019/02/21 17:35:34 [INFO] renaming myawesomewebsite.com.pem to simplecert/local/cert.pem
-2019/02/21 17:35:34 [INFO] renaming myawesomewebsite.com-key.pem to simplecert/local/key.pem
-2019/02/21 17:35:34 starting HTTP Listener on Port 80
-2019/02/21 17:35:34 serving: https://myawesomewebsite.com
-2019/02/21 17:35:45 [INFO] simplecert: checking if cacheDir simplecert/local exists...
-2019/02/21 17:35:45 starting HTTP Listener on Port 80
-2019/02/21 17:35:45 serving: https://myawesomewebsite.com