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
+}