Merge pull request #426 from Plaenkler/add-custom-provider

[ADD] Provider Custom

README.md

@@ -26,13 +26,21 @@ The user-friendly interface allows for straightforward secure setup and manageme
 - [x] Supports multiple IP resolvers
 - [x] Deploy as Windows Service
 - [x] Available as Docker Container
+- [x] Custom update URL with check
 
 ## 🏷️ Supported providers
 
 `Strato` `DDNSS` `Dynu` `Aliyun` `NoIP` `DD24` `INWX`
 
 > **Note:** If your DynDNS provider is not listed open an issue and I will integrate it.
 
+### Custom provider
+
+Select the provider **Custom** from the provider list.
+Then enter the user-defined URL in the **URL** field.
+Use the placeholder `<ipv4>` at the point where the IPv4 address is to be inserted.
+In the **“Check”** field, enter a string that will be used for checking to ensure that the update server's response is successful.
+
 ## 📜 Installation guide
 
 ### 🐋 Deploy with Docker

pkg/ddns/providers/custom.go

@@ -0,0 +1,31 @@
+package providers
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+type UpdateCustomRequest struct {
+	Domain string `json:"URL"`
+	Check  string `json:"Check"`
+}
+
+func UpdateCustom(request interface{}, ipAddr string) error {
+	r, ok := request.(*UpdateCustomRequest)
+	if !ok {
+		return fmt.Errorf("invalid request type: %T", request)
+	}
+	if !strings.Contains(r.Domain, "<ipv4>") {
+		return fmt.Errorf("no <ipv4> placeholder found in URL")
+	}
+	r.Domain = strings.Replace(r.Domain, "<ipv4>", ipAddr, -1)
+	resp, err := SendHTTPRequest(http.MethodGet, r.Domain, nil)
+	if err != nil {
+		return err
+	}
+	if !strings.Contains(resp, r.Check) {
+		return fmt.Errorf("check string '%s' not found in response", r.Check)
+	}
+	return nil
+}

pkg/ddns/update.go

@@ -10,6 +10,7 @@ type provider struct {
 }
 
 var updaters = map[string]provider{
+	"Custom":       {Updater: providers.UpdateCustom, Request: providers.UpdateCustomRequest{}},
 	"Strato":       {Updater: providers.UpdateStrato, Request: providers.UpdateStratoRequest{}},
 	"DDNSS":        {Updater: providers.UpdateDDNSS, Request: providers.UpdateDDNSSRequest{}},
 	"Dynu":         {Updater: providers.UpdateDynu, Request: providers.UpdateDynuRequest{}},