feat: notification provider gotify

config.example.yaml

@@ -8,6 +8,12 @@ dns_provider:
   config:
     api_key: <your-api-key>
     base_url: https://api.hosting.ionos.com/dns
+notification_provider:
+  type: gotify
+  config:
+    url: <your-gotify-host>
+    token: <your-token>
+    priority: 0
 domains:
   - tld: example.com
     subdomains:

main.go

@@ -2,13 +2,17 @@ package main
 
 import (
 	"fmt"
+	"time"
+
 	"realdnydns/pkg/changeDetector"
 	"realdnydns/pkg/config"
 	"realdnydns/pkg/dnsProvider"
 	ionos "realdnydns/pkg/dnsProvider/ionos"
 	"realdnydns/pkg/externalIpProvider"
 	plainExternalIpProvider "realdnydns/pkg/externalIpProvider/plain"
-	"time"
+	"realdnydns/pkg/notificationProvider"
+	notificationProviderConsole "realdnydns/pkg/notificationProvider/console"
+	gotify "realdnydns/pkg/notificationProvider/gotify"
 
 	"github.com/go-co-op/gocron"
 )
@@ -50,7 +54,25 @@ func main() {
 		panic(fmt.Errorf("unknown DNS provider: %s", configClient.DNSProvider.Type))
 	}
 
-	changeDetector := changeDetector.New(externalIpProvider, dnsProvider, configClient.Domains)
+	var notificationProvider notificationProvider.NotificationProvider
+	switch configClient.NotificationProvider.Type {
+	case "gotify":
+		var gotifyConfig gotify.NotificationProviderImplGotifyConfig
+		err := configClient.NotificationProvider.ProviderConfig.Decode(&gotifyConfig)
+		if err != nil {
+			panic(err)
+		}
+
+		notificationProvider, err = gotify.New(gotifyConfig)
+		if err != nil {
+			panic(err)
+		}
+	default:
+		// Use default console notification provider
+		notificationProvider = notificationProviderConsole.New()
+	}
+
+	changeDetector := changeDetector.New(externalIpProvider, dnsProvider, notificationProvider, configClient.Domains)
 
 	s := gocron.NewScheduler(time.UTC)
 	s.SingletonMode()

pkg/changeDetector/changeDetector.go

@@ -1,26 +1,31 @@
 package changeDetector
 
 import (
+	"fmt"
 	"realdnydns/pkg/config"
 	"realdnydns/pkg/dnsProvider"
 	"realdnydns/pkg/externalIpProvider"
+	"realdnydns/pkg/notificationProvider"
 )
 
 type ChangeDetector struct {
-	externalIpProvider externalIpProvider.ExternalIpProvider
-	dnsProvider        dnsProvider.DNSProvider
-	domains            []config.DomainConfig
+	externalIpProvider   externalIpProvider.ExternalIpProvider
+	dnsProvider          dnsProvider.DNSProvider
+	notificationProvider notificationProvider.NotificationProvider
+	domains              []config.DomainConfig
 }
 
 func New(
 	externalIpProvider externalIpProvider.ExternalIpProvider,
 	dnsProvider dnsProvider.DNSProvider,
+	notificationProvider notificationProvider.NotificationProvider,
 	domains []config.DomainConfig,
 ) ChangeDetector {
 	return ChangeDetector{
-		externalIpProvider: externalIpProvider,
-		dnsProvider:        dnsProvider,
-		domains:            domains,
+		externalIpProvider:   externalIpProvider,
+		dnsProvider:          dnsProvider,
+		notificationProvider: notificationProvider,
+		domains:              domains,
 	}
 }
 
@@ -40,6 +45,14 @@ func (c *ChangeDetector) DetectAndApplyChanges() (int, error) {
 			}
 
 			if currentRecord.IP != externalIp.String() {
+				err = c.notificationProvider.SendNotification(
+					fmt.Sprintf("Update %s.%s", subdomain, domain.TLD),
+					fmt.Sprintf("The IP of %s has changed from %s to %s", domain.TLD, currentRecord.IP, externalIp.String()),
+				)
+				if err != nil {
+					return numberUpdated, err
+				}
+
 				_, err = c.dnsProvider.UpdateRecord(domain.TLD, subdomain, externalIp, currentRecord.TTL, currentRecord.Prio, currentRecord.Disabled)
 				numberUpdated++
 				if err != nil {

pkg/changeDetector/changeDetector_test.go

@@ -43,6 +43,14 @@ func (m *MockDNSProviderImpl) UpdateRecord(tld string, subdomain string, ip net.
 	}, nil
 }
 
+type MockedNotificationProvider struct{}
+
+type MockedNotificationProviderImpl struct{}
+
+func (m *MockedNotificationProviderImpl) SendNotification(title string, message string) error {
+	return nil
+}
+
 func TestDetectAndApplyChanges(t *testing.T) {
 	t.Run("with changes", testDetectAndApplyChangesWithChanges())
 	t.Run("without changes", testDetectAndApplyChangesWithoutChanges())
@@ -55,15 +63,16 @@ func testDetectAndApplyChangesWithChanges() func(t *testing.T) {
 		}, &MockDNSProviderImpl{
 			GetRecordIpResponse:    "127.0.0.2",
 			UpdateRecordIpResponse: "127.0.0.1",
-		}, []config.DomainConfig{
-			{
-				TLD: "example.com",
-				Subdomains: []string{
-					"test",
-					"@",
+		}, &MockedNotificationProviderImpl{},
+			[]config.DomainConfig{
+				{
+					TLD: "example.com",
+					Subdomains: []string{
+						"test",
+						"@",
+					},
 				},
-			},
-		})
+			})
 
 		numberUpdated, err := changeDetector.DetectAndApplyChanges()
 		if err != nil {
@@ -83,15 +92,16 @@ func testDetectAndApplyChangesWithoutChanges() func(t *testing.T) {
 		}, &MockDNSProviderImpl{
 			GetRecordIpResponse:    "127.0.0.1",
 			UpdateRecordIpResponse: "127.0.0.1",
-		}, []config.DomainConfig{
-			{
-				TLD: "example.com",
-				Subdomains: []string{
-					"test",
-					"@",
+		}, &MockedNotificationProviderImpl{},
+			[]config.DomainConfig{
+				{
+					TLD: "example.com",
+					Subdomains: []string{
+						"test",
+						"@",
+					},
 				},
-			},
-		})
+			})
 
 		numberUpdated, err := changeDetector.DetectAndApplyChanges()
 		if err != nil {

pkg/config/config.go

@@ -12,10 +12,11 @@ type DomainConfig struct {
 }
 
 type Config struct {
-	ExternalIPProvider ExternalIpProviderConfig `yaml:"ip_provider"`
-	DNSProvider        DNSProviderConfig        `yaml:"dns_provider"`
-	Domains            []DomainConfig           `yaml:"domains"`
-	CheckInterval      string                   `yaml:"check_interval"`
+	ExternalIPProvider   ExternalIpProviderConfig   `yaml:"ip_provider"`
+	DNSProvider          DNSProviderConfig          `yaml:"dns_provider"`
+	NotificationProvider NotificationProviderConfig `yaml:"notification_provider,omitempty"`
+	Domains              []DomainConfig             `yaml:"domains"`
+	CheckInterval        string                     `yaml:"check_interval"`
 }
 
 type ExternalIpProviderConfig struct {
@@ -28,6 +29,11 @@ type DNSProviderConfig struct {
 	ProviderConfig yaml.Node `yaml:"config"`
 }
 
+type NotificationProviderConfig struct {
+	Type           string    `yaml:"type"`
+	ProviderConfig yaml.Node `yaml:"config"`
+}
+
 func (c *Config) Load(filePath string) error {
 	err := yaml.Unmarshal([]byte(filePath), c)
 	if err != nil {

pkg/config/config_test.go

@@ -49,6 +49,10 @@ dns_provider:
   config:
     api_key: exampleAPIKey
     base_url: https://example.com
+notification_provider:
+  type: gotify
+  config:
+    url: https://example.com
 domains:
   - tld: example.com
     subdomains:
@@ -56,7 +60,7 @@ domains:
       - www
 check_interval: 0 0 0/6 * * * *`)
 
-		want := c.DNSProvider.Type == "ionos" && c.ExternalIPProvider.Type == "plain"
+		want := c.DNSProvider.Type == "ionos" && c.ExternalIPProvider.Type == "plain" && c.NotificationProvider.Type == "gotify"
 
 		if !want || err != nil {
 			t.Fatalf("DnsProviderName couldn't be properly loaded or unmarshaled, Load() = %v, want %v", err, want)

pkg/notificationProvider/console/console.go

@@ -0,0 +1,16 @@
+package notificationProviderConsole
+
+import (
+	"fmt"
+)
+
+type NotificationProviderImplConsole struct{}
+
+func New() *NotificationProviderImplConsole {
+	return &NotificationProviderImplConsole{}
+}
+
+func (p *NotificationProviderImplConsole) SendNotification(title string, message string) error {
+	fmt.Printf("%s: %s\n", title, message)
+	return nil
+}

pkg/notificationProvider/gotify/gotify.go

@@ -0,0 +1,87 @@
+package notificationProviderGotify
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+type NotificationProviderImplGotifyConfig struct {
+	Url      string `yaml:"url"`
+	Token    string `yaml:"token"`
+	Priority int    `yaml:"priority"`
+}
+
+type NotificationProviderImplGotify struct {
+	Url        url.URL
+	Token      string
+	Priority   int
+	HTTPClient *http.Client
+}
+
+func New(config NotificationProviderImplGotifyConfig) (*NotificationProviderImplGotify, error) {
+	if config.Url == "" {
+		return nil, fmt.Errorf("url is required")
+	}
+
+	url, err := url.Parse(config.Url)
+	if err != nil {
+		return nil, err
+	}
+
+	if config.Token == "" {
+		return nil, fmt.Errorf("token is required")
+	}
+
+	if config.Priority < 0 || config.Priority > 4 {
+		return nil, fmt.Errorf("priority must be between 0 and 4")
+	}
+
+	return &NotificationProviderImplGotify{
+		*url,
+		config.Token,
+		config.Priority,
+		&http.Client{},
+	}, nil
+}
+
+func (p *NotificationProviderImplGotify) SendNotification(title string, message string) error {
+	type GotifyMessage struct {
+		Message  string `json:"message"`
+		Title    string `json:"title"`
+		Priority int    `json:"priority"`
+	}
+
+	messageJson, err := json.Marshal(GotifyMessage{
+		message,
+		title,
+		p.Priority,
+	})
+	if err != nil {
+		return err
+	}
+
+	messageUrl := p.Url
+	messageUrl.JoinPath("message")
+	messageUrl.Query().Add("token", p.Token)
+
+	req, err := http.NewRequest("POST", messageUrl.String(), bytes.NewBuffer(messageJson))
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	res, err := p.HTTPClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	if res.StatusCode != 200 {
+		return fmt.Errorf("unexpected status code: %d", res.StatusCode)
+	}
+
+	return nil
+}

pkg/notificationProvider/gotify/gotify_test.go

@@ -0,0 +1,81 @@
+package notificationProviderGotify_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	gotify "realdnydns/pkg/notificationProvider/gotify"
+)
+
+func TestNew(t *testing.T) {
+	t.Run("URL is required", testNewEmptyUrl())
+	t.Run("Token is required", testNewEmptyToken())
+	t.Run("Priority must be between 0 and 4", testNewInvalidPriority())
+	t.Run("Sends POST request to url", testNewSendsPostRequest())
+}
+
+func testNewEmptyUrl() func(t *testing.T) {
+	return func(t *testing.T) {
+		_, err := gotify.New(gotify.NotificationProviderImplGotifyConfig{
+			Token:    "1234",
+			Priority: 1,
+		})
+
+		if err.Error() != "url is required" {
+			t.Errorf("Expected error 'url is required', got %v", err)
+		}
+	}
+}
+
+func testNewEmptyToken() func(t *testing.T) {
+	return func(t *testing.T) {
+		_, err := gotify.New(gotify.NotificationProviderImplGotifyConfig{
+			Url:      "http://localhost:1234",
+			Priority: 0,
+		})
+
+		if err.Error() != "token is required" {
+			t.Errorf("Expected error 'token is required', got %v", err)
+		}
+	}
+}
+
+func testNewInvalidPriority() func(t *testing.T) {
+	return func(t *testing.T) {
+		_, err := gotify.New(gotify.NotificationProviderImplGotifyConfig{
+			Url:      "http://localhost:1234",
+			Token:    "token",
+			Priority: 5,
+		})
+
+		if err.Error() != "priority must be between 0 and 4" {
+			t.Errorf("Expected error 'priority must be between 0 and 4', got %v", err)
+		}
+	}
+}
+
+func testNewSendsPostRequest() func(t *testing.T) {
+	return func(t *testing.T) {
+		mockServer := httptest.NewServer(http.HandlerFunc(
+			func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(200)
+			},
+		))
+		defer mockServer.Close()
+
+		provider, err := gotify.New(gotify.NotificationProviderImplGotifyConfig{
+			Url:      mockServer.URL,
+			Token:    "1234",
+			Priority: 0,
+		})
+		if err != nil {
+			t.Fatalf("New() returned unexpected error: %v", err)
+		}
+
+		err = provider.SendNotification("title", "message")
+		if err != nil {
+			t.Fatalf("SendNotification() returned unexpected error: %v", err)
+		}
+	}
+}

pkg/notificationProvider/notificationProvider.go

@@ -0,0 +1,5 @@
+package notificationProvider
+
+type NotificationProvider interface {
+	SendNotification(title string, message string) error
+}