chore(pkg/provider): JSON marshalable Provider

pkg/provider/provider.go

@@ -5,24 +5,24 @@ import "net/netip"
 const defaultDoTPort uint16 = 853
 
 type Provider struct {
-	Name string
-	DNS  DNSServer
-	DoT  DoTServer
-	DoH  DoHServer
+	Name string    `json:"name"`
+	DNS  DNSServer `json:"dns"`
+	DoT  DoTServer `json:"dot"`
+	DoH  DoHServer `json:"doh"`
 }
 
 type DNSServer struct {
-	IPv4 []netip.Addr
-	IPv6 []netip.Addr
+	IPv4 []netip.Addr `json:"ipv4"`
+	IPv6 []netip.Addr `json:"ipv6"`
 }
 
 type DoTServer struct {
-	IPv4 []netip.Addr
-	IPv6 []netip.Addr
-	Name string // for TLS verification
-	Port uint16
+	IPv4 []netip.Addr `json:"ipv4"`
+	IPv6 []netip.Addr `json:"ipv6"`
+	Name string       `json:"name"` // for TLS verification
+	Port uint16       `json:"port"`
 }
 
 type DoHServer struct {
-	URL string
+	URL string `json:"url"`
 }

pkg/provider/provider_test.go

@@ -0,0 +1,30 @@
+package provider
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_Provider_JSON(t *testing.T) {
+	t.Parallel()
+
+	provider := Google()
+
+	providerJSON, err := json.Marshal(provider)
+	require.NoError(t, err)
+
+	const expectedProviderJSON = `{"name":"Google",` +
+		`"dns":{"ipv4":["8.8.8.8","8.8.4.4"],"ipv6":["2001:4860:4860::8888","2001:4860:4860::8844"]},` +
+		`"dot":{"ipv4":["8.8.8.8","8.8.4.4"],"ipv6":["2001:4860:4860::8888","2001:4860:4860::8844"],` +
+		`"name":"dns.google","port":853},` +
+		`"doh":{"url":"https://dns.google/dns-query"}}`
+	assert.Equal(t, expectedProviderJSON, string(providerJSON))
+
+	var decodedProvider Provider
+	err = json.Unmarshal(providerJSON, &decodedProvider)
+	require.NoError(t, err)
+	assert.Equal(t, provider, decodedProvider)
+}