feat: link shoutrrr and initialize services (part 1 of shoutrrr suppo…

…rt) (#633)

.golangci.yaml

@@ -39,6 +39,7 @@ linters:
     - varcheck # deprecated
 
     - cyclop # can detect complicated code, but never leads to actual code changes
+    - funlen # can detect complicated code, but never leads to actual code changes
     - gocognit # can detect complicated code, but never leads to actual code changes
     - maintidx # can detect complicated code, but never leads to actual code changes
 

README.markdown

@@ -13,7 +13,7 @@ A feature-rich and robust Cloudflare DDNS updater with a small footprint. The pr
 
 ### ⚡ Efficiency
 
-- 🤏 The Docker image takes less than 3 MB (after compression).
+- 🤏 The Docker image takes less than 5 MB after compression.
 - 🔁 The Go runtime re-uses existing HTTP connections.
 - 🗃️ Cloudflare API responses are cached to reduce the API usage.
 

go.mod

@@ -4,6 +4,7 @@ go 1.21
 
 require (
 	github.com/cloudflare/cloudflare-go v0.80.0
+	github.com/containrrr/shoutrrr v0.8.0
 	github.com/google/go-querystring v1.1.0
 	github.com/hashicorp/go-retryablehttp v0.7.4
 	github.com/jellydator/ttlcache/v3 v3.1.0
@@ -16,10 +17,14 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fatih/color v1.15.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/sync v0.5.0 // indirect
+	golang.org/x/sys v0.14.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

go.sum

@@ -1,33 +1,50 @@
 github.com/cloudflare/cloudflare-go v0.80.0 h1:BfCFK9gy+2H/R3yjZWzFvWsVXwr2zICCfmAW3brbHpE=
 github.com/cloudflare/cloudflare-go v0.80.0/go.mod h1:gkHQf9xEubaQPEuerBuoinR9P8bf8a05Lq0X6WKy1Oc=
+github.com/containrrr/shoutrrr v0.8.0 h1:mfG2ATzIS7NR2Ec6XL+xyoHzN97H8WPjir8aYzJUSec=
+github.com/containrrr/shoutrrr v0.8.0/go.mod h1:ioyQAyu1LJY6sILuNyKaQaw+9Ttik5QePU8atnAdO2o=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
-github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
+github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
+github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
+github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
+github.com/go-logr/logr v1.2.3/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
+github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
+github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4B2jHnOSGXyyzV8ROjYa2ojvAY6HCGYYfMoC3Ls=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg=
-github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
+github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
+github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9neXJWAZQ=
 github.com/hashicorp/go-cleanhttp v0.5.2/go.mod h1:kO/YDlP8L1346E6Sodw+PrpBSV4/SoxCXGY6BqNFT48=
 github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
 github.com/hashicorp/go-hclog v1.2.0 h1:La19f8d7WIlm4ogzNHB0JGqs5AUDAZ2UfCY4sJXcJdM=
 github.com/hashicorp/go-hclog v1.2.0/go.mod h1:whpDNt7SSdeAju8AWKIWsul05p54N/39EeqMAyrmvFQ=
 github.com/hashicorp/go-retryablehttp v0.7.4 h1:ZQgVdpTdAL7WpMIwLzCfbalOcSUdkDZnpUv3/+BxzFA=
 github.com/hashicorp/go-retryablehttp v0.7.4/go.mod h1:Jy/gPYAdjqffZ/yFGCFV2doI5wjtH1ewM9u8iYVjtX8=
+github.com/jarcoal/httpmock v1.3.0 h1:2RJ8GP0IIaWwcC9Fp2BmVi8Kog3v2Hn7VXM3fTd+nuc=
+github.com/jarcoal/httpmock v1.3.0/go.mod h1:3yb8rc4BI7TCBhFY8ng0gjuLKJNquuDNiPaZjnENuYg=
 github.com/jellydator/ttlcache/v3 v3.1.0 h1:0gPFG0IHHP6xyUyXq+JaD8fwkDCqgqwohXNJBcYE71g=
 github.com/jellydator/ttlcache/v3 v3.1.0/go.mod h1:hi7MGFdMAwZna5n2tuvh63DvFLzVKySzCVW6+0gA2n4=
 github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
 github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
-github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
-github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
-github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/onsi/ginkgo/v2 v2.9.2 h1:BA2GMJOtfGAfagzYtrAlufIP0lq6QERkFmHLMLPwFSU=
+github.com/onsi/ginkgo/v2 v2.9.2/go.mod h1:WHcJJG2dIlcCqVfBAwUCrJxSPFb6v4azBwgxeMeDuts=
+github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
+github.com/onsi/gomega v1.27.6/go.mod h1:PIQNjfQwkP3aQAH7lf7j87O/5FiNr+ZR8+ipb+qQlhg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
@@ -45,13 +62,19 @@ golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
 golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
 golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
-golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/time v0.4.0 h1:Z81tqI5ddIoXDPvVQ7/7CC9TnLM7ubaFG2qXYd5BbYY=
 golang.org/x/time v0.4.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=
+golang.org/x/tools v0.7.0/go.mod h1:4pg6aUX35JBAogB10C9AtvVL+qowtN4pT3CGSQex14s=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=

internal/config/config.go

@@ -9,6 +9,7 @@ import (
 	"github.com/favonia/cloudflare-ddns/internal/domain"
 	"github.com/favonia/cloudflare-ddns/internal/ipnet"
 	"github.com/favonia/cloudflare-ddns/internal/monitor"
+	"github.com/favonia/cloudflare-ddns/internal/notifier"
 	"github.com/favonia/cloudflare-ddns/internal/provider"
 )
 
@@ -29,6 +30,7 @@ type Config struct {
 	DetectionTimeout time.Duration
 	UpdateTimeout    time.Duration
 	Monitors         []monitor.Monitor
+	Notifiers        []notifier.Notifier
 }
 
 // Default gives the default configuration.
@@ -54,5 +56,6 @@ func Default() *Config {
 		UpdateTimeout:    time.Second * 30, //nolint:gomnd
 		DetectionTimeout: time.Second * 5,  //nolint:gomnd
 		Monitors:         nil,
+		Notifiers:        nil,
 	}
 }

internal/config/config_print.go

@@ -10,6 +10,7 @@ import (
 	"github.com/favonia/cloudflare-ddns/internal/domain"
 	"github.com/favonia/cloudflare-ddns/internal/ipnet"
 	"github.com/favonia/cloudflare-ddns/internal/monitor"
+	"github.com/favonia/cloudflare-ddns/internal/notifier"
 	"github.com/favonia/cloudflare-ddns/internal/pp"
 	"github.com/favonia/cloudflare-ddns/internal/provider"
 )
@@ -94,4 +95,11 @@ func (c *Config) Print(ppfmt pp.PP) {
 			item(service+":", "%s", params)
 		}, c.Monitors)
 	}
+
+	if len(c.Notifiers) > 0 {
+		section("Notifiers (via shoutrrr):")
+		notifier.DescribeAll(func(service, params string) {
+			item(service+":", "%s", params)
+		}, c.Notifiers)
+	}
 }

internal/config/config_print_test.go

@@ -4,14 +4,14 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/stretchr/testify/require"
 	"go.uber.org/mock/gomock"
 
 	"github.com/favonia/cloudflare-ddns/internal/config"
 	"github.com/favonia/cloudflare-ddns/internal/domain"
 	"github.com/favonia/cloudflare-ddns/internal/ipnet"
 	"github.com/favonia/cloudflare-ddns/internal/mocks"
 	"github.com/favonia/cloudflare-ddns/internal/monitor"
+	"github.com/favonia/cloudflare-ddns/internal/notifier"
 	"github.com/favonia/cloudflare-ddns/internal/pp"
 )
 
@@ -117,7 +117,9 @@ func TestPrintMaps(t *testing.T) {
 		printItem(innerMockPP, "IP detection:", "5s"),
 		printItem(innerMockPP, "Record updating:", "30s"),
 		mockPP.EXPECT().Infof(pp.EmojiConfig, "Monitors:"),
-		printItem(innerMockPP, "Healthchecks:", "(URL redacted)"),
+		printItem(innerMockPP, "Meow:", "purrrr"),
+		mockPP.EXPECT().Infof(pp.EmojiConfig, "Notifiers (via shoutrrr):"),
+		printItem(innerMockPP, "Snake:", "hissss"),
 	)
 
 	c := config.Default()
@@ -133,10 +135,20 @@ func TestPrintMaps(t *testing.T) {
 	c.Proxied[domain.FQDN("c")] = false
 	c.Proxied[domain.FQDN("d")] = false
 
-	m, ok := monitor.NewHealthchecks(mockPP, "https://user:pass@host/path")
-	require.True(t, ok)
+	m := mocks.NewMockMonitor(mockCtrl)
+	m.EXPECT().Describe(gomock.Any()).
+		DoAndReturn(func(f func(string, string)) {
+			f("Meow", "purrrr")
+		}).AnyTimes()
 	c.Monitors = []monitor.Monitor{m}
 
+	n := mocks.NewMockNotifier(mockCtrl)
+	n.EXPECT().Describe(gomock.Any()).
+		DoAndReturn(func(f func(string, string)) {
+			f("Snake", "hissss")
+		}).AnyTimes()
+	c.Notifiers = []notifier.Notifier{n}
+
 	c.Print(mockPP)
 }
 

internal/config/config_read.go

@@ -29,7 +29,8 @@ func (c *Config) ReadEnv(ppfmt pp.PP) bool {
 		!ReadNonnegDuration(ppfmt, "DETECTION_TIMEOUT", &c.DetectionTimeout) ||
 		!ReadNonnegDuration(ppfmt, "UPDATE_TIMEOUT", &c.UpdateTimeout) ||
 		!ReadAndAppendHealthchecksURL(ppfmt, "HEALTHCHECKS", &c.Monitors) ||
-		!ReadAndAppendUptimeKumaURL(ppfmt, "UPTIMEKUMA", &c.Monitors) {
+		!ReadAndAppendUptimeKumaURL(ppfmt, "UPTIMEKUMA", &c.Monitors) ||
+		!ReadAndAppendShoutrrrURL(ppfmt, "SHOUTRRR", &c.Notifiers) {
 		return false
 	}
 

internal/config/config_read_test.go

@@ -17,16 +17,31 @@ import (
 	"github.com/favonia/cloudflare-ddns/internal/provider"
 )
 
-//nolint:paralleltest // environment variables are global
-func TestReadEnvWithOnlyToken(t *testing.T) {
-	mockCtrl := gomock.NewController(t)
-
+func unsetAll(t *testing.T) {
+	t.Helper()
 	unset(t,
 		"CF_API_TOKEN", "CF_API_TOKEN_FILE", "CF_ACCOUNT_ID",
 		"IP4_PROVIDER", "IP6_PROVIDER",
 		"DOMAINS", "IP4_DOMAINS", "IP6_DOMAINS",
-		"UPDATE_CRON", "UPDATE_ON_START", "DELETE_ON_STOP", "CACHE_EXPIRATION", "TTL", "PROXIED", "DETECTION_TIMEOUT")
+		"UPDATE_CRON",
+		"UPDATE_ON_START",
+		"DELETE_ON_STOP",
+		"CACHE_EXPIRATION",
+		"TTL",
+		"PROXIED",
+		"DETECTION_TIMEOUT",
+		"UPDATE_TIMEOUT",
+		"HEALTHCHECKS",
+		"UPTIMEKUMA",
+		"SHOUTRRR",
+	)
+}
+
+//nolint:paralleltest // environment variables are global
+func TestReadEnvWithOnlyToken(t *testing.T) {
+	mockCtrl := gomock.NewController(t)
 
+	unsetAll(t)
 	store(t, "CF_API_TOKEN", "deadbeaf")
 
 	var cfg config.Config
@@ -55,12 +70,7 @@ func TestReadEnvWithOnlyToken(t *testing.T) {
 func TestReadEnvEmpty(t *testing.T) {
 	mockCtrl := gomock.NewController(t)
 
-	unset(t,
-		"CF_API_TOKEN", "CF_API_TOKEN_FILE", "CF_ACCOUNT_ID",
-		"IP4_PROVIDER", "IP6_PROVIDER",
-		"IP4_POLICY", "IP6_POLICY",
-		"DOMAINS", "IP4_DOMAINS", "IP6_DOMAINS",
-		"UPDATE_CRON", "UPDATE_ON_START", "DELETE_ON_STOP", "CACHE_EXPIRATION", "TTL", "PROXIED", "DETECTION_TIMEOUT")
+	unsetAll(t)
 
 	var cfg config.Config
 	mockPP := mocks.NewMockPP(mockCtrl)

internal/config/env_base.go

@@ -16,6 +16,19 @@ func Getenv(key string) string {
 	return strings.TrimSpace(os.Getenv(key))
 }
 
+// Getenvs reads an environment variable, split it by '\n', and trim the space.
+func Getenvs(key string) []string {
+	rawVals := strings.Split(os.Getenv(key), "\n")
+	vals := make([]string, 0, len(rawVals))
+	for _, v := range rawVals {
+		v = strings.TrimSpace(v)
+		if len(v) > 0 {
+			vals = append(vals, v)
+		}
+	}
+	return vals
+}
+
 // ReadString reads an environment variable as a plain string.
 func ReadString(ppfmt pp.PP, key string, field *string) bool {
 	val := Getenv(key)

internal/config/env_base_test.go

@@ -59,6 +59,29 @@ func TestGetenv(t *testing.T) {
 	}
 }
 
+//nolint:paralleltest // environment vars are global
+func TestGetenvs(t *testing.T) {
+	key := keyPrefix + "VAR"
+	for name, tc := range map[string]struct {
+		set      bool
+		val      string
+		expected []string
+	}{
+		"nil":         {false, "", []string{}},
+		"empty":       {true, "", []string{}},
+		"only-spaces": {true, "\n   \n  \n \t", []string{}},
+		"simple":      {true, "VAL", []string{"VAL"}},
+		"space1":      {true, "    VAL1 \nVAL2    ", []string{"VAL1", "VAL2"}},
+		"space2":      {true, "     VAL1 \n   VAL2 ", []string{"VAL1", "VAL2"}},
+	} {
+		tc := tc
+		t.Run(name, func(t *testing.T) {
+			set(t, key, tc.set, tc.val)
+			require.Equal(t, tc.expected, config.Getenvs(key))
+		})
+	}
+}
+
 //nolint:paralleltest // environment vars are global
 func TestReadString(t *testing.T) {
 	key := keyPrefix + "STRING"

internal/config/env_notifier.go

@@ -0,0 +1,24 @@
+package config
+
+import (
+	"github.com/favonia/cloudflare-ddns/internal/notifier"
+	"github.com/favonia/cloudflare-ddns/internal/pp"
+)
+
+// ReadAndAppendShoutrrrURL reads the URLs separated by the newline.
+func ReadAndAppendShoutrrrURL(ppfmt pp.PP, key string, field *[]notifier.Notifier) bool {
+	vals := Getenvs(key)
+
+	if len(vals) == 0 {
+		return true
+	}
+
+	s, ok := notifier.NewShoutrrr(ppfmt, vals)
+	if !ok {
+		return false
+	}
+
+	// Append the new monitor to the existing list
+	*field = append(*field, s)
+	return true
+}