Initialise first version code

Author: SRV332003

.env

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+AUTH_SECRET=your_secret
+AUTH_EXPIRES_IN=1d
+
+MAIL_HOST=smtp.mailtrap.io
+MAIL_PORT=2525
+MAIL_USER=your_user
+MAIL_PASS=your_pass
+

.gitignore

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+FROM golang:1.22.4 AS builder
+
+ARG VERSION=dev
+WORKDIR /app
+
+
+# {{ENV}}
+ENV AUTH_SECRET {AUTH_SECRET}
+ENV AUTH_EXPIRES_IN {AUTH_EXPIRES_IN}
+ENV MAIL_HOST {MAIL_HOST}
+ENV MAIL_PORT {MAIL_PORT}
+ENV MAIL_USER {MAIL_USER}
+ENV MAIL_PASS {MAIL_PASS}
+# {{END ENV}}
+
+RUN go install github.com/swaggo/swag/cmd/swag@latest
+COPY . .
+ENV PATH=$PATH:/go/bin
+RUN make build
+CMD ["./strive_backend"]

Dockerfile

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+build:
+	go build
+	cp docker-env ~/go/bin/docker-env

Makefile

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+FROM golang:1.22.4 AS builder
+
+ARG VERSION=dev
+WORKDIR /app
+# {{ENV}}
+ENV AUTH_SECRET {AUTH_SECRET}
+ENV AUTH_EXPIRES_IN {AUTH_EXPIRES_IN}
+ENV MAIL_HOST {MAIL_HOST}
+ENV MAIL_PORT {MAIL_PORT}
+ENV MAIL_USER {MAIL_USER}
+ENV MAIL_PASS {MAIL_PASS}
+# {{END ENV}}
+
+RUN go install github.com/swaggo/swag/cmd/swag@latest
+COPY . .
+ENV PATH=$PATH:/go/bin
+RUN make build
+CMD ["./strive_backend"] .

docker-env

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+module github.com/SRV332003/docker-env
+
+go 1.22.4

docker.template

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+package handlers
+
+import "os"
+
+func CreateTemplate(dockerfile string) error {
+	// open dockerfile in read mode
+	file, err := os.OpenFile(dockerfile, os.O_RDONLY, 0644)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	// create a new file in write mode
+	newFile, err := os.Create("Docker.template")
+	if err != nil {
+		return err
+	}
+	defer newFile.Close()
+
+	// copy the content of dockerfile to newFile
+	_, err = file.WriteTo(newFile)
+	if err != nil {
+		return err
+	}
+
+	return nil
+
+}

go.mod

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+package handlers
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+)
+
+func UpdateEnvs(envfile string, Dockerfile string) error {
+	// open envfile in read mode
+	file, err := os.OpenFile(envfile, os.O_RDONLY, 0644)
+	if err != nil {
+		return err
+	}
+
+	// read the content of envfile
+	fileinfo, err := file.Stat()
+	content := make([]byte, fileinfo.Size())
+	_, err = file.Read(content)
+	if err != nil {
+		return err
+	}
+
+	// parse key value pairs from envfile
+	envs := strings.Split(string(content), "\n")
+	envKeys := make([]string, 0)
+	for _, env := range envs {
+		if env != "" || env != "\n" || env[0] != '#' {
+			keyValue := strings.Split(env, "=")
+			if len(keyValue) != 2 {
+				continue
+			}
+
+			line := "ENV " + keyValue[0] + " {" + keyValue[0] + "}"
+
+			envKeys = append(envKeys, line)
+		}
+	}
+
+	// open Dockerfile in read & write mode
+	dockerfile, err := os.OpenFile(Dockerfile, os.O_RDWR, 0644)
+	if err != nil {
+		return err
+	}
+
+	// search for {{.ENV}} in Dockerfile
+	fileinfo, err = dockerfile.Stat()
+	content = make([]byte, fileinfo.Size())
+	_, err = dockerfile.Read(content)
+	if err != nil {
+		return err
+	}
+
+	// prepare keys to replace {{.ENV}} in Dockerfile
+	replaceText := strings.Join(envKeys, "\n")
+	replaceText = replaceText + "\n"
+	replaceText = "\n\n# {{ENV}}\n" + replaceText + "# {{END ENV}}\n\n"
+
+	// search for {{.ENV}} in Dockerfile
+
+	re := regexp.MustCompile(`\n*#\s*{{ENV}}(\D|\d)*#\s*{{END ENV}}\n*`)
+	match := string(re.Find(content))
+
+	if match == "" {
+		log.Println("{{.ENV}} not used previously in Dockerfile")
+		re = regexp.MustCompile(`\n*#\s*{{ENV}}`)
+		match = string(re.Find(content))
+		fmt.Println(match)
+		if match == "" {
+			return fmt.Errorf("{{.ENV}} not found in Dockerfile")
+		}
+	}
+
+	// replace {{.ENV}} with key value pairs from envfile
+	newContent := strings.Replace(string(content), match, replaceText, 1)
+
+	// clear the contents of the Dockerfile
+	err = dockerfile.Truncate(0)
+	if err != nil {
+		return err
+	}
+
+	// write the new content to Dockerfile
+	_, err = dockerfile.WriteAt([]byte(newContent), 0)
+	if err != nil {
+		return err
+	}
+
+	return nil
+
+}

handlers/createTemplate.go

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+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/SRV332003/docker-env/handlers"
+)
+
+func main() {
+	// get cli arguments
+	args := os.Args
+	if len(args) > 2 {
+		fmt.Println("Usage: docker-env <envfile> <Dockerfile>")
+		fmt.Println("Default values are .env and Dockerfile")
+
+		os.Exit(1)
+	}
+	if len(args) == 1 {
+		args = append(args, ".env", "Dockerfile")
+	}
+
+	if len(args) == 2 {
+		args = append(args, "Dockerfile")
+	}
+
+	fmt.Println("Creating Dockerfile template")
+	err := handlers.UpdateEnvs(args[1], args[2])
+	if err != nil {
+		fmt.Println(err)
+	}
+
+}