Update base image version to fix sec vuln and renamed Dockerfiles for clarity

docker/Dockerfile.linux.amd64

@@ -1,11 +1,11 @@
-FROM golang:1.22.1-alpine as builder
+FROM golang:1.22.7-alpine as builder
 
 WORKDIR /go/src/drone-email
 COPY . .
 
 RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build
 
-FROM alpine:3.14
+FROM alpine:3.20
 
 RUN apk add --no-cache ca-certificates tzdata
 

docker/Dockerfile.linux.arm64

@@ -1,11 +1,11 @@
-FROM golang:1.22.1-alpine as builder
+FROM golang:1.22.7-alpine as builder
 
 WORKDIR /go/src/drone-email
 COPY . .
 
 RUN GOOS=linux GOARCH=arm GOARM=7 CGO_ENABLED=0 go build
 
-FROM alpine:3.14
+FROM alpine:3.20
 
 RUN apk add --no-cache ca-certificates tzdata
 

go.mod

@@ -1,3 +1,3 @@
 module github.com/drone-plugins/drone-email
 
-go 1.22.1
+go 1.22.7

plugin.go

@@ -118,31 +118,46 @@ type (
 func (p Plugin) Exec() error {
 	var dialer *gomail.Dialer
 
-	if !p.Config.RecipientsOnly {
-		exists := false
-		for _, recipient := range p.Config.Recipients {
-			if recipient == p.Commit.Author.Email {
-				exists = true
-			}
-		}
+	recipientsMap := make(map[string]struct{})
 
-		if !exists {
-			p.Config.Recipients = append(p.Config.Recipients, p.Commit.Author.Email)
+	// Add recipients from the config
+	for _, recipient := range p.Config.Recipients {
+		if recipient == "" {
+			log.Warnf("Skipping empty recipient from config")
+			continue
+		}
+		recipientsMap[recipient] = struct{}{}
+	}
+
+	// Add commit author's email if not already present and RecipientsOnly is false
+	if !p.Config.RecipientsOnly {
+		if p.Commit.Author.Email != "" {
+			recipientsMap[p.Commit.Author.Email] = struct{}{}
+		} else {
+			log.Warn("Commit author email is empty")
 		}
 	}
 
+	// Add recipients from the recipients file
 	if p.Config.RecipientsFile != "" {
 		f, err := os.Open(p.Config.RecipientsFile)
 		if err == nil {
 			scanner := bufio.NewScanner(f)
 			for scanner.Scan() {
-				p.Config.Recipients = append(p.Config.Recipients, scanner.Text())
+				recipient := scanner.Text()
+				if recipient == "" {
+					log.Warnf("Skipping empty recipient from file %s", p.Config.RecipientsFile)
+					continue
+				}
+				recipientsMap[recipient] = struct{}{}
 			}
 		} else {
 			log.Errorf("Could not open RecipientsFile %s: %v", p.Config.RecipientsFile, err)
 		}
 	}
 
+	log.Infof("Recipients: %v", recipientsMap)
+
 	if p.Config.Username == "" && p.Config.Password == "" {
 		dialer = &gomail.Dialer{Host: p.Config.Host, Port: p.Config.Port}
 	} else {
@@ -216,10 +231,7 @@ func (p Plugin) Exec() error {
 
 	// Send emails
 	message := gomail.NewMessage()
-	for _, recipient := range p.Config.Recipients {
-		if len(recipient) == 0 {
-			continue
-		}
+	for recipient := range recipientsMap {
 		message.SetAddressHeader("From", p.Config.FromAddress, p.Config.FromName)
 		message.SetAddressHeader("To", recipient, "")
 		message.SetHeader("Subject", subject)