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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ssm"
"github.com/joho/godotenv"
"os"
)
func getSsmParam(ssmSvc *ssm.SSM, keyName string) string {
param, err := ssmSvc.GetParameter(&ssm.GetParameterInput{
Name: &keyName,
WithDecryption: aws.Bool(true),
})
if err != nil {
panic(errors.New(
fmt.Sprintf("Error: %v\nParameter: %s\n", err.Error(), keyName)))
}
value := *param.Parameter.Value
return value
}
func substituteSsmParams(ssmSvc *ssm.SSM, env map[string]string) map[string]string {
var substEnv = make(map[string]string)
for k, v := range env {
if strings.HasPrefix(v, "ssm:") {
newVal := getSsmParam(ssmSvc, v[4:])
substEnv[k] = newVal
} else {
substEnv[k] = v
}
}
return substEnv
}
func main() {
var region string
var srcPath string
flag.StringVar(®ion, "region", os.Getenv("AWS_REGION"), "AWS region")
flag.StringVar(&srcPath, "src", os.Getenv("SRC_PATH"), "Source env file path")
flag.Parse()
if region == "" || srcPath == "" {
flag.PrintDefaults()
os.Exit(1)
}
sess, err := session.NewSession(
&aws.Config{Region: aws.String(region)},
)
if err != nil {
panic(err)
}
ssmSvc := ssm.New(sess)
var env = make(map[string]string)
env, err = godotenv.Read(srcPath)
if err != nil {
panic(err)
}
substEnv := substituteSsmParams(ssmSvc, env)
content, _ := godotenv.Marshal(substEnv)
fmt.Printf("%v\n", content)
}