fix update and add initialization

.dockerignore

@@ -1,5 +1,3 @@
-node_modules
 .git
 .gitignore
 *.md
-dist

.env.template

@@ -0,0 +1,2 @@
+API_KEY=123
+ZONE_ID=023e105f4ecef8ad9ca31a8372d0c353

.gitignore

@@ -1,130 +1,21 @@
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-lerna-debug.log*
-.pnpm-debug.log*
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
 
-# Diagnostic reports (https://nodejs.org/api/report.html)
-report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+# Test binary, built with `go test -c`
+*.test
 
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
 
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
+# Dependency directories (remove the comment below to include it)
+# vendor/
 
-# Coverage directory used by tools like istanbul
-coverage
-*.lcov
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directories
-node_modules/
-jspm_packages/
-
-# Snowpack dependency directory (https://snowpack.dev/)
-web_modules/
-
-# TypeScript cache
-*.tsbuildinfo
-
-# Optional npm cache directory
-.npm
-
-# Optional eslint cache
-.eslintcache
-
-# Optional stylelint cache
-.stylelintcache
-
-# Microbundle cache
-.rpt2_cache/
-.rts2_cache_cjs/
-.rts2_cache_es/
-.rts2_cache_umd/
-
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
+# Go workspace file
+go.work
 
 # dotenv environment variable files
 .env
-.env.development.local
-.env.test.local
-.env.production.local
-.env.local
-
-# parcel-bundler cache (https://parceljs.org/)
-.cache
-.parcel-cache
-
-# Next.js build output
-.next
-out
-
-# Nuxt.js build / generate output
-.nuxt
-dist
-
-# Gatsby files
-.cache/
-# Comment in the public line in if your project uses Gatsby and not Next.js
-# https://nextjs.org/blog/next-9-1#public-directory-support
-# public
-
-# vuepress build output
-.vuepress/dist
-
-# vuepress v2.x temp and cache directory
-.temp
-.cache
-
-# Docusaurus cache and generated files
-.docusaurus
-
-# Serverless directories
-.serverless/
-
-# FuseBox cache
-.fusebox/
-
-# DynamoDB Local files
-.dynamodb/
-
-# TernJS port file
-.tern-port
-
-# Stores VSCode versions used for testing VSCode extensions
-.vscode-test
-
-# yarn v2
-.yarn/cache
-.yarn/unplugged
-.yarn/build-state.yml
-.yarn/install-state.gz
-.pnp.*

Dockerfile

@@ -1,18 +1,12 @@
-FROM node:slim AS base
-ENV PNPM_HOME="/pnpm"
-ENV PATH="${PNPM_HOME}:${PATH}"
-RUN corepack enable
-COPY . /app
-WORKDIR /app
+FROM golang:1.22
 
-FROM base as prod-deps
-RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --prod --frozen-lockfile
+WORKDIR /usr/src/app
 
-FROM base AS build
-RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
-RUN pnpm run build
+# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
+# COPY go.mod go.sum ./
+# RUN go mod download && go mod verify
 
-FROM base
-COPY --from=prod-deps /app/node_modules /app/node_modules
-COPY --from=build /app/dist /app/dist
-CMD [ "pnpm", "start" ]
+COPY . .
+RUN go build -v -o /usr/local/bin/app ./...
+
+CMD ["app"]

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 mxmlndml
+Copyright (c) 2024 mxmlndml
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,6 +1,60 @@
-# Cloudflare Dynamic DNS
+# Dynamic DNS Updates with Cloudflare
 
-This Docker container provides a simple and efficient solution for dynamic DNS
-updates using Cloudflare DNS. It allows you to automatically update your DNS
-records in Cloudflare at specified intervals, ensuring that your services are
-always accessible through a domain name.
+![cloudflare-dynamic-dns](https://github.com/mxmlndml/cloudflare-dynamic-dns/assets/42516330/d1faa020-e730-4f53-9706-4fe9e9a7bd41)
+
+This Docker container offers a straightforward and efficient solution for
+automating dynamic DNS updates using the Cloudflare DNS service. It empowers you
+to effortlessly update your DNS records in Cloudflare at predefined intervals,
+guaranteeing that your services are consistently accessible through a domain
+name.
+
+## Prerequisites
+
+Before you can use this Docker container, ensure you meet the following
+prerequisites:
+
+- Docker: [Docker installation guide](https://docs.docker.com/get-docker/)
+- Cloudflare DNS:
+  [Cloudflare zone setups guide](https://developers.cloudflare.com/dns/zone-setups/)
+
+## Installation
+
+This script runs as a Docker container, which means installation is as simple as
+pulling the pre-built Docker container and running it with the necessary
+environment variables
+
+```sh
+docker run -d -e API_KEY=123 -e ZONE_ID=023e105f4ecef8ad9ca31a8372d0c353 -e DOMAIN_NAMES=dyndns.example.com,example.com --restart=always mxmlndml/cloudflare-dynamic-dns
+```
+
+Alternatively you can copy the `docker-compose.yml` from this repository into an
+empty directory of your machine, edit the environment variables and start the
+container with `docker compose`
+
+```sh
+docker compose up -d
+```
+
+## Configuration
+
+You can configure this Docker container using environment variables. Here's a
+breakdown of the available configuration variables:
+
+- **`API_KEY`** _required_
+  \
+  Cloudflare API token with `Zone Settings:Read`, `Zone:Read` and `DNS:Edit`
+  permissions
+- **`ZONE_ID`** _required_
+  \
+  Zone ID of your website (in the right sidebar on the overview page of your
+  site)
+- **`DOMAIN_NAMES`** _required_
+  \
+  List of DNS A records that should store your public IP address delimited by a
+  comma (and only a comma)
+- **`INTERVAL`** _defaults to `5`_
+  \
+  Time interval in minutes between DNS updates
+- **`LOG_LEVEL`** _defaults to `INFO`_
+  \
+  Logging level for the container, either `DEBUG`, `INFO`, `WARN` or `ERROR`

cloudflare.go

@@ -0,0 +1,141 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+type dnsRecord struct {
+	id      string
+	content string
+}
+type DNSRecords struct {
+	name string
+	a    dnsRecord
+	aaaa dnsRecord
+}
+
+func setAuthHeader(req *http.Request, apiKey string) {
+	authHeader := fmt.Sprint("bearer ", apiKey)
+	req.Header.Add("Authorization", authHeader)
+}
+
+func GetDNSRecord(zoneID string, domainName string, apiKey string) DNSRecords {
+	dnsRecords := DNSRecords{
+		name: domainName,
+	}
+
+	url := fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%s/dns_records?name=%s", zoneID, domainName)
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		log.Panic("Error creating the request: ", err)
+	}
+	setAuthHeader(req, apiKey)
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Panic("Error loading the response: ", err)
+	}
+
+	defer resp.Body.Close()
+
+	var data struct {
+		Success bool
+		Errors  []struct {
+			Message string
+		}
+		Result []struct {
+			ID      string
+			Content string
+			Type    string
+		}
+	}
+	err = json.NewDecoder(resp.Body).Decode(&data)
+	if err != nil {
+		log.Panic("Error parsing JSON: ", err)
+	}
+	if !data.Success {
+		msg := ""
+		for i, err := range data.Errors {
+			if i != 0 {
+				msg += ", "
+			}
+			msg += err.Message
+		}
+
+		log.Panic("Server responded with error: ", msg)
+	}
+
+	for _, record := range data.Result {
+		switch record.Type {
+		case "A":
+			dnsRecords.a = dnsRecord{id: record.ID, content: record.Content}
+		case "AAAA":
+			dnsRecords.aaaa = dnsRecord{id: record.ID, content: record.Content}
+		}
+	}
+	return dnsRecords
+}
+
+type DNSRecordBody struct {
+	Content string
+	Name    string
+	Type    string
+}
+
+func UpdateDNSRecord(zoneID string, dnsRecordID string, apiKey string, body DNSRecordBody) {
+	var method string
+	var url string
+	if dnsRecordID == "" {
+		method = http.MethodPost
+		url = fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%v/dns_records", zoneID)
+	} else {
+		method = http.MethodPatch
+		url = fmt.Sprintf("https://api.cloudflare.com/client/v4/zones/%v/dns_records/%v", zoneID, dnsRecordID)
+	}
+
+	encodedBody, err := json.Marshal(&body)
+	if err != nil {
+		log.Panic("Error parsing the json body: ", err)
+	}
+
+	req, err := http.NewRequest(method, url, bytes.NewReader(encodedBody))
+	if err != nil {
+		log.Panic("Error creating the request: ", err)
+	}
+	setAuthHeader(req, apiKey)
+	req.Header.Add("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Panic("Error loading the response: ", err)
+	}
+
+	defer resp.Body.Close()
+
+	var data struct {
+		Success bool
+		Errors  []struct {
+			Message string
+		}
+	}
+	err = json.NewDecoder(resp.Body).Decode(&data)
+	if err != nil {
+		log.Fatal("Error parsing JSON: ", err)
+	}
+
+	if !data.Success {
+		msg := ""
+		for i, err := range data.Errors {
+			if i != 0 {
+				msg += ", "
+			}
+			msg += err.Message
+		}
+		log.Panic("Server responded with error: ", msg)
+	}
+}

docker-compose.yml

@@ -1,10 +1,9 @@
 services:
   cloudflare-dynamic-dns:
     image: mxmlndml/cloudflare-dynamic-dns:latest
-    restart: always
     environment:
-      - API_KEY=123
-      - ZONE_ID=023e105f4ecef8ad9ca31a8372d0c353
-      - DOMAIN_NAME=dyndns.example.com
-      - INTERVAL=5
-      - LOG_LEVEL=INFO
+      - "API_KEY=${API_KEY}"
+      - "ZONE_ID=${ZONE_ID}"
+      - "DOMAIN_NAMES=example.com,dyndns.example.com"
+      # - "RECORD_TYPES=A"
+      # - "INTERVAL=5"

env.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func GetAPIKey() string {
+	value, isSet := os.LookupEnv("API_KEY")
+	if !isSet {
+		log.Panic("Missing environment variable 'API_KEY'")
+	}
+
+	return value
+}
+
+func GetZoneID() string {
+	value, isSet := os.LookupEnv("ZONE_ID")
+	if !isSet {
+		log.Panic("Missing environment variable 'ZONE_ID'")
+	}
+
+	return value
+}
+
+func GetDomainNames() []string {
+	value, isSet := os.LookupEnv("DOMAIN_NAMES")
+	if !isSet {
+		log.Panic("Missing environment variable 'DOMAIN_NAMES'")
+	}
+
+	return strings.Split(value, ",")
+}
+
+func UseIPv4() bool {
+	value, isSet := os.LookupEnv("RECORD_TYPES")
+	if !isSet {
+		return true
+	}
+
+	switch value {
+	case "A", "*":
+		return true
+	case "AAAA":
+		return false
+	default:
+		log.Panicf("Unrecognized value '%v' for 'RECORD_TYPES'", value)
+		return false
+	}
+}
+
+func UseIPv6() bool {
+	value, isSet := os.LookupEnv("RECORD_TYPES")
+	if !isSet {
+		return false
+	}
+
+	switch value {
+	case "AAAA", "*":
+		return true
+	case "A":
+		return false
+	default:
+		log.Panicf("Unrecognized value '%v' for 'RECORD_TYPES'", value)
+		return false
+	}
+}
+
+func GetInterval() int {
+	value, isSet := os.LookupEnv("INTERVAL")
+
+	if !isSet {
+		return 5
+	}
+
+	interval, err := strconv.Atoi(value)
+	if err != nil {
+		log.Panic("Error converting 'INTERVAL' to integer: ", err)
+	}
+
+	return interval
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/mxmlndml/cloudflare-dynamic-dns
+
+go 1.22.0

main.go

@@ -0,0 +1,132 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+	"time"
+)
+
+type publicIP struct {
+	v4 string
+	v6 string
+}
+
+func getPublicIP() publicIP {
+	var publicIP publicIP
+	var wg sync.WaitGroup
+
+	if UseIPv4() {
+		wg.Add(1)
+		go func() {
+			publicIP.v4 = GetPublicIP(4)
+			wg.Done()
+		}()
+	}
+
+	if UseIPv6() {
+		wg.Add(1)
+		go func() {
+			publicIP.v6 = GetPublicIP(6)
+			wg.Done()
+		}()
+	}
+
+	wg.Wait()
+	return publicIP
+}
+
+func getDNSRecords() []DNSRecords {
+	apiKey := GetAPIKey()
+	zoneID := GetZoneID()
+	domainNames := GetDomainNames()
+	ch := make(chan DNSRecords, len(domainNames))
+	defer close(ch)
+
+	for _, domainName := range domainNames {
+		go func() {
+			ch <- GetDNSRecord(zoneID, domainName, apiKey)
+		}()
+	}
+
+	var dnsRecords []DNSRecords
+	for i := 0; i < len(domainNames); i++ {
+		dnsRecord := <-ch
+		dnsRecords = append(dnsRecords, dnsRecord)
+	}
+
+	return dnsRecords
+}
+
+func initialize() {
+	fmt.Println("  _______             _______               ___                       _       ___  _  ______")
+	fmt.Println(" / ___/ /__  __ _____/ / _/ /__ ________   / _ \\__ _____  ___ ___ _  (_)___  / _ \\/ |/ / __/")
+	fmt.Println("/ /__/ / _ \\/ // / _  / _/ / _ `/ __/ -_) / // / // / _ \\/ _ `/  ' \\/ / __/ / // /    /\\ \\  ")
+	fmt.Println("\\___/_/\\___/\\_,_/\\_,_/_//_/\\_,_/_/  \\__/ /____/\\_, /_//_/\\_,_/_/_/_/_/\\__/ /____/_/|_/___/  ")
+	fmt.Println("                                              /___/                                         ")
+
+	var recordType string
+	if UseIPv4() && UseIPv6() {
+		recordType = "A and AAAA"
+	} else if UseIPv4() {
+		recordType = "A"
+	} else if UseIPv6() {
+		recordType = "AAAA"
+	}
+
+	domainNames := strings.Join(GetDomainNames(), ", ")
+
+	interval := GetInterval()
+
+	fmt.Printf("Updating %v records of %v every %v minutes\n\n", recordType, domainNames, interval)
+}
+
+func main() {
+	initialize()
+
+	for {
+		var publicIP publicIP
+		var dnsRecords []DNSRecords
+		var wg sync.WaitGroup
+
+		// concurrently fetch public ip and dns records
+		wg.Add(2)
+		go func() {
+			publicIP = getPublicIP()
+			wg.Done()
+		}()
+		go func() {
+			dnsRecords = getDNSRecords()
+			wg.Done()
+		}()
+		wg.Wait()
+
+		// concurrently create/update dns entries if their content is not current public ip
+		apiKey := GetAPIKey()
+		zoneID := GetZoneID()
+		for _, dnsRecord := range dnsRecords {
+			if UseIPv4() && publicIP.v4 != dnsRecord.a.content {
+				wg.Add(1)
+
+				go func() {
+					UpdateDNSRecord(zoneID, dnsRecord.a.id, apiKey, DNSRecordBody{Type: "A", Name: dnsRecord.name, Content: publicIP.v4})
+					log.Printf("Set DNS A record %v to %v", dnsRecord.name, publicIP.v4)
+					wg.Done()
+				}()
+			}
+			if UseIPv6() && publicIP.v6 != dnsRecord.aaaa.content {
+				wg.Add(1)
+
+				go func() {
+					UpdateDNSRecord(zoneID, dnsRecord.aaaa.id, apiKey, DNSRecordBody{Type: "AAAA", Name: dnsRecord.name, Content: publicIP.v6})
+					log.Printf("Set DNS AAAA record %v to %v", dnsRecord.name, publicIP.v6)
+					wg.Done()
+				}()
+			}
+		}
+		wg.Wait()
+
+		time.Sleep(time.Duration(GetInterval()) * time.Minute)
+	}
+}

package.json

@@ -1,18 +0,0 @@
-{
-  "name": "cloudflare-dynamic-dns",
-  "version": "0.1.0",
-  "description": "",
-  "main": "dist/index.js",
-  "scripts": {
-    "build": "rimraf ./dist && tsc",
-    "start": "pnpm build && node ."
-  },
-  "keywords": [],
-  "author": "",
-  "license": "MIT",
-  "devDependencies": {
-    "@types/node": "^20.2.5",
-    "rimraf": "^5.0.1",
-    "typescript": "^5.0.4"
-  }
-}

pnpm-lock.yaml

@@ -1,258 +0,0 @@
-lockfileVersion: '6.0'
-
-devDependencies:
-  '@types/node':
-    specifier: ^20.2.5
-    version: 20.2.5
-  rimraf:
-    specifier: ^5.0.1
-    version: 5.0.1
-  typescript:
-    specifier: ^5.0.4
-    version: 5.0.4
-
-packages:
-
-  /@isaacs/cliui@8.0.2:
-    resolution: {integrity: sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==}
-    engines: {node: '>=12'}
-    dependencies:
-      string-width: 5.1.2
-      string-width-cjs: /string-width@4.2.3
-      strip-ansi: 7.1.0
-      strip-ansi-cjs: /strip-ansi@6.0.1
-      wrap-ansi: 8.1.0
-      wrap-ansi-cjs: /wrap-ansi@7.0.0
-    dev: true
-
-  /@pkgjs/parseargs@0.11.0:
-    resolution: {integrity: sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==}
-    engines: {node: '>=14'}
-    requiresBuild: true
-    dev: true
-    optional: true
-
-  /@types/node@20.2.5:
-    resolution: {integrity: sha512-JJulVEQXmiY9Px5axXHeYGLSjhkZEnD+MDPDGbCbIAbMslkKwmygtZFy1X6s/075Yo94sf8GuSlFfPzysQrWZQ==}
-    dev: true
-
-  /ansi-regex@5.0.1:
-    resolution: {integrity: sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==}
-    engines: {node: '>=8'}
-    dev: true
-
-  /ansi-regex@6.0.1:
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-    engines: {node: '>=12'}
-    dev: true
-
-  /ansi-styles@4.3.0:
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-    engines: {node: '>=8'}
-    dependencies:
-      color-convert: 2.0.1
-    dev: true
-
-  /ansi-styles@6.2.1:
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-    engines: {node: '>=12'}
-    dev: true
-
-  /balanced-match@1.0.2:
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-    dev: true
-
-  /brace-expansion@2.0.1:
-    resolution: {integrity: sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==}
-    dependencies:
-      balanced-match: 1.0.2
-    dev: true
-
-  /color-convert@2.0.1:
-    resolution: {integrity: sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==}
-    engines: {node: '>=7.0.0'}
-    dependencies:
-      color-name: 1.1.4
-    dev: true
-
-  /color-name@1.1.4:
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-    dev: true
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-      shebang-command: 2.0.0
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-    dev: true
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-    dev: true
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-    dev: true
-
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-    engines: {node: '>=14'}
-    dependencies:
-      cross-spawn: 7.0.3
-      signal-exit: 4.0.2
-    dev: true
-
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-    resolution: {integrity: sha512-U/rnDpXJGF414QQQZv5uVsabTVxMSwzS5CH0p3DRCIV6ownl4f7PzGnkGmvlum2wB+9RlJWJZ6ACU1INnBqiPA==}
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-    hasBin: true
-    dependencies:
-      foreground-child: 3.1.1
-      jackspeak: 2.2.1
-      minimatch: 9.0.1
-      minipass: 6.0.2
-      path-scurry: 1.9.2
-    dev: true
-
-  /is-fullwidth-code-point@3.0.0:
-    resolution: {integrity: sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==}
-    engines: {node: '>=8'}
-    dev: true
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-    dev: true
-
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-    engines: {node: '>=14'}
-    dependencies:
-      '@isaacs/cliui': 8.0.2
-    optionalDependencies:
-      '@pkgjs/parseargs': 0.11.0
-    dev: true
-
-  /lru-cache@9.1.1:
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-    engines: {node: 14 || >=16.14}
-    dev: true
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-    engines: {node: '>=16 || 14 >=14.17'}
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-    dev: true
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-    engines: {node: '>=16 || 14 >=14.17'}
-    dev: true
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-    engines: {node: '>=8'}
-    dev: true
-
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-    resolution: {integrity: sha512-qSDLy2aGFPm8i4rsbHd4MNyTcrzHFsLQykrtbuGRknZZCBBVXSv2tSCDN2Cg6Rt/GFRw8GoW9y9Ecw5rIPG1sg==}
-    engines: {node: '>=16 || 14 >=14.17'}
-    dependencies:
-      lru-cache: 9.1.1
-      minipass: 6.0.2
-    dev: true
-
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-    resolution: {integrity: sha512-OfFZdwtd3lZ+XZzYP/6gTACubwFcHdLRqS9UX3UwpU2dnGQYkPFISRwvM3w9IiB2w7bW5qGo/uAwE4SmXXSKvg==}
-    engines: {node: '>=14'}
-    hasBin: true
-    dependencies:
-      glob: 10.2.6
-    dev: true
-
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-    engines: {node: '>=8'}
-    dependencies:
-      shebang-regex: 3.0.0
-    dev: true
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-    engines: {node: '>=8'}
-    dev: true
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-    engines: {node: '>=14'}
-    dev: true
-
-  /string-width@4.2.3:
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-    engines: {node: '>=8'}
-    dependencies:
-      emoji-regex: 8.0.0
-      is-fullwidth-code-point: 3.0.0
-      strip-ansi: 6.0.1
-    dev: true
-
-  /string-width@5.1.2:
-    resolution: {integrity: sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==}
-    engines: {node: '>=12'}
-    dependencies:
-      eastasianwidth: 0.2.0
-      emoji-regex: 9.2.2
-      strip-ansi: 7.1.0
-    dev: true
-
-  /strip-ansi@6.0.1:
-    resolution: {integrity: sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==}
-    engines: {node: '>=8'}
-    dependencies:
-      ansi-regex: 5.0.1
-    dev: true
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-    resolution: {integrity: sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==}
-    engines: {node: '>=12'}
-    dependencies:
-      ansi-regex: 6.0.1
-    dev: true
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-    engines: {node: '>=12.20'}
-    hasBin: true
-    dev: true
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-    engines: {node: '>= 8'}
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-    dependencies:
-      isexe: 2.0.0
-    dev: true
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-    engines: {node: '>=10'}
-    dependencies:
-      ansi-styles: 4.3.0
-      string-width: 4.2.3
-      strip-ansi: 6.0.1
-    dev: true
-
-  /wrap-ansi@8.1.0:
-    resolution: {integrity: sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==}
-    engines: {node: '>=12'}
-    dependencies:
-      ansi-styles: 6.2.1
-      string-width: 5.1.2
-      strip-ansi: 7.1.0
-    dev: true

public_ip.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+)
+
+func GetPublicIP(version int8) string {
+	url := fmt.Sprintf("https://ipv%d.icanhazip.com", version)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		log.Panic("Failed to get public IP: ", err)
+	}
+
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+
+	return strings.TrimSpace(string(body))
+}

src/cloudflare.ts

@@ -1,80 +0,0 @@
-type CFResponse = {
-  result: {
-    content: string;
-    name: string;
-    type: string;
-    id: string;
-  }[];
-  errors: {
-    code: number;
-    message: string;
-  }[];
-  success: boolean;
-};
-
-const getDnsRecord = async (
-  zoneIdentifier: string,
-  name: string,
-  type: string,
-  apiKey: string,
-): Promise<{ content: string; id: string }> => {
-  const url =
-    `https://api.cloudflare.com/client/v4/zones/${zoneIdentifier}/dns_records?name=${name}&type=${type}`;
-  const headers = {
-    Authorization: `bearer ${apiKey}`,
-  };
-
-  const response = await fetch(url, { headers });
-  const json: CFResponse = await response.json();
-
-  if (json.success) {
-    return (({ content, id }) => ({ content, id }))(json.result[0]);
-  }
-
-  const error = json.errors.reduce(
-    (message, error) => `${message}${error.message}. `,
-    "",
-  );
-  throw new Error(
-    `failed to get dns ${type.toLowerCase()} record '${name}'. ${error}`,
-  );
-};
-
-const patchDnsRecord = async (
-  zoneIdentifier: string,
-  identifier: string,
-  apiKey: string,
-  content: string,
-  name: string,
-  type: string,
-) => {
-  const url =
-    `https://api.cloudflare.com/client/v4/zones/${zoneIdentifier}/dns_records/${identifier}`;
-  const method = "PATCH";
-  const headers = {
-    Authorization: `bearer ${apiKey}`,
-    "Content-Type": "application/json",
-  };
-  const body = JSON.stringify({
-    content,
-    name,
-    type,
-  });
-
-  const response = await fetch(url, { method, headers, body });
-  const json: CFResponse = await response.json();
-
-  if (json.success) {
-    return;
-  }
-
-  const error = json.errors.reduce(
-    (message, error) => `${message}${error.message}. `,
-    "",
-  );
-  throw new Error(
-    `failed to patch dns ${type.toLowerCase} record '${name}'. ${error}`,
-  );
-};
-
-export { getDnsRecord, patchDnsRecord };

src/getPublicIp.ts

@@ -1,98 +0,0 @@
-import { Resolver } from "dns/promises";
-import * as log from "./log";
-
-const OPEN_DNS = {
-  RESOLVER: "resolver1.opendns.com",
-  MYIP: "myip.opendns.com",
-};
-const HTTPS_URLS = [
-  "https://ipv4.icanhazip.com",
-  "https://ifconfig.me/ip",
-  "https://myexternalip.com/raw",
-  "https://ipecho.net/plain",
-];
-
-let dnsServers: string[] = [];
-
-// get public ipv4 address via dns
-const dns = async (): Promise<string> => {
-  const resolver = new Resolver();
-
-  // set resolver to opendns
-  if (dnsServers.length === 0) {
-    // cache dns server ip
-    dnsServers = await resolver.resolve4(OPEN_DNS.RESOLVER);
-    log.debug(`cached resolver ip address '${dnsServers[0]}'`);
-  }
-  resolver.setServers(dnsServers);
-
-  // get public ip via opendns dns lookup
-  const [publicIp] = await resolver.resolve4(OPEN_DNS.MYIP);
-  log.debug(`determined public ip address '${publicIp}' via dns`);
-
-  return publicIp;
-};
-
-const https = async (): Promise<string> => {
-  const messages: string[] = [];
-
-  const requests = HTTPS_URLS.map(async (url: string): Promise<Response> => {
-    try {
-      const response = await fetch(url);
-
-      if (response.ok) {
-        return response;
-      }
-      throw new Error(response.statusText);
-    } catch (error) {
-      const message =
-        `failed to fetch public ip address via https from '${url}'`;
-      messages.push(message);
-      throw new Error(message);
-    }
-  });
-
-  try {
-    const response = await Promise.any(requests);
-    const publicIp = (await response.text()).replace("\n", "");
-    log.debug(
-      `determined public ip address '${publicIp}' via https using '${response.url}'`,
-    );
-    return publicIp;
-  } catch (error) {
-    messages.forEach((message) => log.warn(message));
-    throw new Error((error as Error).message);
-  }
-};
-
-const getPublicIp = async () => {
-  let ip = "";
-  try {
-    log.debug("determine public ip address via dns");
-    ip = await dns();
-  } catch (error) {
-    if (dnsServers.length === 0) {
-      log.warn(`dns resolution of '${OPEN_DNS.RESOLVER}' timed out`);
-    } else {
-      log.warn(
-        `dns resolution of '${OPEN_DNS.MYIP}' via '${dnsServers[0]}' timed out`,
-      );
-      dnsServers = [];
-      log.debug("reset cached dns servers");
-    }
-    log.debug("fall back to https");
-
-    try {
-      log.debug("determine public ip address via https");
-      ip = await https();
-    } catch (error) {
-      throw new Error(
-        "failed to determine public ip address via dns and https",
-      );
-    }
-  }
-
-  return ip;
-};
-
-export default getPublicIp;

src/index.ts

@@ -1,58 +0,0 @@
-import { getDnsRecord, patchDnsRecord } from "./cloudflare";
-import getPublicIp from "./getPublicIp";
-import * as log from "./log";
-
-const { ZONE_ID, DOMAIN_NAME, API_KEY, INTERVAL } = process.env;
-
-if (ZONE_ID === undefined) {
-  log.error("could not access environment variable 'ZONE_ID'");
-}
-if (DOMAIN_NAME === undefined) {
-  log.error("could not access environment variable 'DOMAIN_NAME'");
-}
-if (API_KEY === undefined) {
-  log.error("could not access environment variable 'API_KEY'");
-}
-if (
-  ZONE_ID === undefined || DOMAIN_NAME === undefined || API_KEY === undefined
-) {
-  process.exit(1);
-}
-
-const dynamicDns = async () => {
-  try {
-    const [publicIp, dnsRecord] = await Promise.all([
-      getPublicIp(),
-      getDnsRecord(ZONE_ID, DOMAIN_NAME, "A", API_KEY),
-    ]);
-
-    if (publicIp === dnsRecord.content) {
-      log.info(`public ip address remained at '${publicIp}', no patch needed`);
-      log.info(`checking again in ${INTERVAL} minutes\n`);
-      return;
-    }
-
-    log.info(
-      `public ip address changed from '${dnsRecord.content}' to '${publicIp}'`,
-    );
-    await patchDnsRecord(
-      ZONE_ID,
-      dnsRecord.id,
-      API_KEY,
-      publicIp,
-      DOMAIN_NAME,
-      "A",
-    );
-    log.info("patched dns entry");
-    log.info(`checking again in ${INTERVAL} minutes\n`);
-  } catch (error) {
-    log.error((error as Error).message);
-    log.info(`retrying in ${INTERVAL} minutes\n`);
-  }
-};
-
-dynamicDns();
-setInterval(
-  dynamicDns,
-  Number.parseInt(INTERVAL === undefined ? "5" : INTERVAL) * 60 * 1000,
-);

src/log.ts

@@ -1,50 +0,0 @@
-const STYLES = {
-  RESET: "\x1b[0m",
-  DEBUG: "\x1b[37m",
-  INFO: "\x1b[34m",
-  WARN: "\x1b[33m",
-  ERROR: "\x1b[31m",
-};
-
-let LOG_LEVEL = process.env.LOG_LEVEL || "INFO";
-
-if (!["DEBUG", "INFO", "WARN", "ERROR"].includes(LOG_LEVEL)) {
-  console.warn(
-    `${STYLES.WARN}[WARN]\tunknown log level '${LOG_LEVEL}', proceeding with log level 'INFO'${STYLES.RESET}`,
-  );
-  LOG_LEVEL = "INFO";
-}
-
-const debug = (...data: string[]) => {
-  if (!["DEBUG"].includes(LOG_LEVEL)) {
-    return;
-  }
-  const message = `${STYLES.DEBUG}[DEBUG]\t${data.join(" ")}${STYLES.RESET}`;
-  console.debug(message);
-};
-
-const info = (...data: string[]) => {
-  if (!["DEBUG", "INFO"].includes(LOG_LEVEL)) {
-    return;
-  }
-  const message = `${STYLES.INFO}[INFO]\t${data.join(" ")}${STYLES.RESET}`;
-  console.info(message);
-};
-
-const warn = (...data: string[]) => {
-  if (!["DEBUG", "INFO", "WARN"].includes(LOG_LEVEL)) {
-    return;
-  }
-  const message = `${STYLES.WARN}[WARN]\t${data.join(" ")}${STYLES.RESET}`;
-  console.warn(message);
-};
-
-const error = (...data: string[]) => {
-  if (!["DEBUG", "INFO", "WARN", "ERROR"].includes(LOG_LEVEL)) {
-    return;
-  }
-  const message = `${STYLES.ERROR}[ERROR]\t${data.join(" ")}${STYLES.RESET}`;
-  console.error(message);
-};
-
-export { debug, error, info, warn };

tsconfig.json

@@ -1,109 +0,0 @@
-{
-  "compilerOptions": {
-    /* Visit https://aka.ms/tsconfig to read more about this file */
-
-    /* Projects */
-    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
-    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
-    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
-    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
-    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
-    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
-
-    /* Language and Environment */
-    "target": "ES2021",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
-    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
-    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
-    // "experimentalDecorators": true,                   /* Enable experimental support for legacy experimental decorators. */
-    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
-    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
-    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
-    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
-    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
-    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
-    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
-    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
-
-    /* Modules */
-    "module": "commonjs",                                /* Specify what module code is generated. */
-    "rootDir": "./src",                                  /* Specify the root folder within your source files. */
-    // "moduleResolution": "node10",                     /* Specify how TypeScript looks up a file from a given module specifier. */
-    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
-    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
-    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
-    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
-    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
-    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
-    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
-    // "allowImportingTsExtensions": true,               /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
-    // "resolvePackageJsonExports": true,                /* Use the package.json 'exports' field when resolving package imports. */
-    // "resolvePackageJsonImports": true,                /* Use the package.json 'imports' field when resolving imports. */
-    // "customConditions": [],                           /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
-    // "resolveJsonModule": true,                        /* Enable importing .json files. */
-    // "allowArbitraryExtensions": true,                 /* Enable importing files with any extension, provided a declaration file is present. */
-    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
-
-    /* JavaScript Support */
-    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
-    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
-    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
-
-    /* Emit */
-    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
-    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
-    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
-    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
-    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
-    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
-    "outDir": "./dist",                                   /* Specify an output folder for all emitted files. */
-    // "removeComments": true,                           /* Disable emitting comments. */
-    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
-    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
-    // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types. */
-    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
-    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
-    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
-    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
-    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
-    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
-    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
-    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
-    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
-    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
-    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
-    // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
-
-    /* Interop Constraints */
-    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
-    // "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
-    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
-    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
-    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
-    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
-
-    /* Type Checking */
-    "strict": true,                                      /* Enable all strict type-checking options. */
-    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
-    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
-    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
-    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
-    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
-    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
-    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
-    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
-    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
-    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
-    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
-    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
-    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
-    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
-    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
-    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
-    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
-    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
-
-    /* Completeness */
-    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
-    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
-  }
-}