Initial commit

ip/resolver/jsonip/service.go

@@ -0,0 +1,39 @@
+package jsonip
+
+import (
+	"encoding/json"
+	"net"
+	"net/http"
+)
+
+type Service struct {
+	url string
+}
+
+func New() *Service {
+	return &Service{
+		url: "https://jsonip.com",
+	}
+}
+
+func (s Service) Name() string {
+	return "jsonip"
+}
+
+func (s Service) Lookup() (net.IP, error) {
+	resp, err := http.DefaultClient.Get(s.url)
+	if err != nil {
+		return nil, err
+	}
+
+	var v struct {
+		Ip       string `json:"ip"`
+		Location string `json:"geo-ip"`
+		Help     string `json:"API Help"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&v); err != nil {
+		return nil, err
+	}
+
+	return net.ParseIP(v.Ip), err
+}

ip/resolver/jsonip/service_test.go

@@ -0,0 +1,31 @@
+package jsonip
+
+import (
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestService_Name(t *testing.T) {
+	s := Service{}
+
+	assert.Equal(t, "jsonip", s.Name())
+}
+
+func TestService_Lookup(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, err := w.Write([]byte(`{"ip":"211.46.32.214","geo-ip":"https://getjsonip.com/#plus","API Help":"https://getjsonip.com/#docs"}`))
+		assert.NoError(t, err)
+	}))
+	defer server.Close()
+
+	s := Service{url: server.URL}
+
+	ip, err := s.Lookup()
+	assert.NoError(t, err)
+
+	assert.Equal(t, net.IPv4(211, 46, 32, 214), ip)
+}