Fix DDNS bugs and split up ddns module (#326)

* fix: webhook retry logic
fix: adjust record type based on ipv4 ipv6
refract: move ddns providers to a new module

* refract: move ddns module to pkg/

pkg/ddns/cloudflare.go

@@ -0,0 +1,177 @@
+package ddns
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+)
+
+type ProviderCloudflare struct {
+	Secret string
+}
+
+func (provider ProviderCloudflare) UpdateDomain(domainConfig *DomainConfig) bool {
+	if domainConfig == nil {
+		return false
+	}
+
+	zoneID, err := provider.getZoneID(domainConfig.FullDomain)
+	if err != nil {
+		log.Printf("无法获取 zone ID: %s\n", err)
+		return false
+	}
+
+	// 当IPv4和IPv6同时成功才算作成功
+	var resultV4 = true
+	var resultV6 = true
+	if domainConfig.EnableIPv4 {
+		if !provider.addDomainRecord(zoneID, domainConfig, true) {
+			resultV4 = false
+		}
+	}
+
+	if domainConfig.EnableIpv6 {
+		if !provider.addDomainRecord(zoneID, domainConfig, false) {
+			resultV6 = false
+		}
+	}
+
+	return resultV4 && resultV6
+}
+
+func (provider ProviderCloudflare) addDomainRecord(zoneID string, domainConfig *DomainConfig, isIpv4 bool) bool {
+	record, err := provider.findDNSRecord(zoneID, domainConfig.FullDomain, isIpv4)
+	if err != nil {
+		log.Printf("查找 DNS 记录时出错: %s\n", err)
+		return false
+	}
+
+	if record == nil {
+		// 添加 DNS 记录
+		return provider.createDNSRecord(zoneID, domainConfig, isIpv4)
+	} else {
+		// 更新 DNS 记录
+		return provider.updateDNSRecord(zoneID, record["id"].(string), domainConfig, isIpv4)
+	}
+}
+
+func (provider ProviderCloudflare) getZoneID(domain string) (string, error) {
+	_, realDomain := SplitDomain(domain)
+	url := fmt.Sprintf("https://api.cloudflare.com/client/v4/zones?name=%s", realDomain)
+	body, err := provider.sendRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	var res map[string]interface{}
+	err = json.Unmarshal(body, &res)
+	if err != nil {
+		return "", err
+	}
+
+	result := res["result"].([]interface{})
+	if len(result) > 0 {
+		zoneID := result[0].(map[string]interface{})["id"].(string)
+		return zoneID, nil
+	}
+
+	return "", fmt.Errorf("找不到 Zone ID")
+}
+
+func (provider ProviderCloudflare) findDNSRecord(zoneID string, domain string, isIPv4 bool) (map[string]interface{}, error) {
+	var ipType = "A"
+	if !isIPv4 {
+		ipType = "AAAA"
+	}
+	url := fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%s/dns_records?type=%s&name=%s", zoneID, ipType, domain)
+	body, err := provider.sendRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var res map[string]interface{}
+	err = json.Unmarshal(body, &res)
+	if err != nil {
+		return nil, err
+	}
+
+	result := res["result"].([]interface{})
+	if len(result) > 0 {
+		return result[0].(map[string]interface{}), nil
+	}
+
+	return nil, nil // 没有找到 DNS 记录
+}
+
+func (provider ProviderCloudflare) createDNSRecord(zoneID string, domainConfig *DomainConfig, isIPv4 bool) bool {
+	var ipType = "A"
+	var ipAddr = domainConfig.Ipv4Addr
+	if !isIPv4 {
+		ipType = "AAAA"
+		ipAddr = domainConfig.Ipv6Addr
+	}
+	url := fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%s/dns_records", zoneID)
+	data := map[string]interface{}{
+		"type":    ipType,
+		"name":    domainConfig.FullDomain,
+		"content": ipAddr,
+		"ttl":     60,
+		"proxied": false,
+	}
+	jsonData, _ := json.Marshal(data)
+	_, err := provider.sendRequest("POST", url, jsonData)
+	return err == nil
+}
+
+func (provider ProviderCloudflare) updateDNSRecord(zoneID string, recordID string, domainConfig *DomainConfig, isIPv4 bool) bool {
+	var ipType = "A"
+	var ipAddr = domainConfig.Ipv4Addr
+	if !isIPv4 {
+		ipType = "AAAA"
+		ipAddr = domainConfig.Ipv6Addr
+	}
+	url := fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%s/dns_records/%s", zoneID, recordID)
+	data := map[string]interface{}{
+		"type":    ipType,
+		"name":    domainConfig.FullDomain,
+		"content": ipAddr,
+		"ttl":     60,
+		"proxied": false,
+	}
+	jsonData, _ := json.Marshal(data)
+	_, err := provider.sendRequest("PATCH", url, jsonData)
+	return err == nil
+}
+
+// 以下为辅助方法，如发送 HTTP 请求等
+func (provider ProviderCloudflare) sendRequest(method string, url string, data []byte) ([]byte, error) {
+	client := &http.Client{}
+	req, err := http.NewRequest(method, url, bytes.NewBuffer(data))
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", provider.Secret))
+	req.Header.Add("Content-Type", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer func(Body io.ReadCloser) {
+		err := Body.Close()
+		if err != nil {
+			log.Printf("NEZHA>> 无法关闭HTTP响应体流: %s\n", err.Error())
+		}
+	}(resp.Body)
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return body, nil
+}

pkg/ddns/ddns.go

@@ -0,0 +1,14 @@
+package ddns
+
+type DomainConfig struct {
+	EnableIPv4 bool
+	EnableIpv6 bool
+	FullDomain string
+	Ipv4Addr   string
+	Ipv6Addr   string
+}
+
+type Provider interface {
+	// UpdateDomain Return is updated
+	UpdateDomain(domainConfig *DomainConfig) bool
+}

pkg/ddns/dummy.go

@@ -0,0 +1,7 @@
+package ddns
+
+type ProviderDummy struct{}
+
+func (provider ProviderDummy) UpdateDomain(domainConfig *DomainConfig) bool {
+	return false
+}

pkg/ddns/helper.go

@@ -0,0 +1,61 @@
+package ddns
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+func (provider ProviderWebHook) FormatWebhookString(s string, config *DomainConfig, ipType string) string {
+	if config == nil {
+		return s
+	}
+
+	result := strings.TrimSpace(s)
+	result = strings.Replace(s, "{ip}", config.Ipv4Addr, -1)
+	result = strings.Replace(result, "{domain}", config.FullDomain, -1)
+	result = strings.Replace(result, "{type}", ipType, -1)
+	// remove \r
+	result = strings.Replace(result, "\r", "", -1)
+	return result
+}
+
+func SetStringHeadersToRequest(req *http.Request, headers []string) {
+	if req == nil {
+		return
+	}
+	for _, element := range headers {
+		kv := strings.SplitN(element, ":", 2)
+		if len(kv) == 2 {
+			req.Header.Add(kv[0], kv[1])
+		}
+	}
+}
+
+// SplitDomain 分割域名为前缀和一级域名
+func SplitDomain(domain string) (prefix string, topLevelDomain string) {
+	// 带有二级TLD的一些常见例子，需要特别处理
+	secondLevelTLDs := map[string]bool{
+		".co.uk": true, ".com.cn": true, ".gov.cn": true, ".net.cn": true, ".org.cn": true,
+	}
+
+	// 分割域名为"."的各部分
+	parts := strings.Split(domain, ".")
+
+	// 处理特殊情况，例如 ".co.uk"
+	for i := len(parts) - 2; i > 0; i-- {
+		potentialTLD := fmt.Sprintf(".%s.%s", parts[i], parts[i+1])
+		if secondLevelTLDs[potentialTLD] {
+			if i > 1 {
+				return strings.Join(parts[:i-1], "."), strings.Join(parts[i-1:], ".")
+			}
+			return "", domain // 当域名仅为二级TLD时，无前缀
+		}
+	}
+
+	// 常规处理，查找最后一个"."前的所有内容作为前缀
+	if len(parts) > 2 {
+		return strings.Join(parts[:len(parts)-2], "."), strings.Join(parts[len(parts)-2:], ".")
+	}
+	return "", domain // 当域名不包含子域名时，无前缀
+}

pkg/ddns/webhook.go

@@ -0,0 +1,59 @@
+package ddns
+
+import (
+	"bytes"
+	"log"
+	"net/http"
+	"strings"
+)
+
+type ProviderWebHook struct {
+	URL           string
+	RequestMethod string
+	RequestBody   string
+	RequestHeader string
+}
+
+func (provider ProviderWebHook) UpdateDomain(domainConfig *DomainConfig) bool {
+	if domainConfig == nil {
+		return false
+	}
+
+	if domainConfig.FullDomain == "" {
+		log.Println("NEZHA>> Failed to update an empty domain")
+		return false
+	}
+	updated := false
+	client := &http.Client{}
+	if domainConfig.EnableIPv4 && domainConfig.Ipv4Addr != "" {
+		url := provider.FormatWebhookString(provider.URL, domainConfig, "ipv4")
+		body := provider.FormatWebhookString(provider.RequestBody, domainConfig, "ipv4")
+		header := provider.FormatWebhookString(provider.RequestHeader, domainConfig, "ipv4")
+		headers := strings.Split(header, "\n")
+		req, err := http.NewRequest(provider.RequestMethod, url, bytes.NewBufferString(body))
+		if err == nil && req != nil {
+			SetStringHeadersToRequest(req, headers)
+			if _, err := client.Do(req); err != nil {
+				log.Printf("NEZHA>> Failed to update a domain: %s. Cause by: %s\n", domainConfig.FullDomain, err.Error())
+			} else {
+				updated = true
+			}
+		}
+	}
+	if domainConfig.EnableIpv6 && domainConfig.Ipv6Addr != "" {
+		url := provider.FormatWebhookString(provider.URL, domainConfig, "ipv6")
+		body := provider.FormatWebhookString(provider.RequestBody, domainConfig, "ipv6")
+		header := provider.FormatWebhookString(provider.RequestHeader, domainConfig, "ipv6")
+		headers := strings.Split(header, "\n")
+		req, err := http.NewRequest(provider.RequestMethod, url, bytes.NewBufferString(body))
+		if err == nil && req != nil {
+			SetStringHeadersToRequest(req, headers)
+			if _, err := client.Do(req); err != nil {
+				log.Printf("NEZHA>> Failed to update a domain: %s. Cause by: %s\n", domainConfig.FullDomain, err.Error())
+			} else {
+				updated = true
+			}
+		}
+	}
+	return updated
+}