feat(get): add get command for single value

Author: Josh Newman

README.md

@@ -91,6 +91,28 @@ Global Flags:
       --version         show version
 ```
 
+### `get`
+
+Get a single parameter by path.
+
+```console
+Get parameter value by path
+
+Usage:
+  easy-params get <path> [flags]
+
+Flags:
+  -d, --decrypt   decrypt "SecureString" value (default true)
+  -h, --help      help for get
+
+Global Flags:
+      --config string   config file (default is $HOME/.easy-params.yaml)
+      --load-config     load aws config from ~/.aws/config (default true)
+  -l, --local-time      convert UTC to local time (default true)
+      --region string   AWS region to use
+      --version         show version
+```
+
 ### `put`
 
 Put a parameter to the specified path.

cmd/get.go

@@ -0,0 +1,53 @@
+package cmd
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/aws/aws-sdk-go-v2/service/ssm"
+	"github.com/spf13/cobra"
+)
+
+var getCmd = &cobra.Command{
+	Use:   "get <path>",
+	Short: "Get parameter value by path",
+	Args: func(cmd *cobra.Command, args []string) error {
+		if len(args) == 0 {
+			return errors.New("requires a path")
+		}
+
+		return nil
+	},
+	Run: runGetCmd,
+}
+
+func runGetCmd(cmd *cobra.Command, args []string) {
+	path := fmt.Sprintf("/%s", stripSlash(args[0]))
+	decrypt, _ := cmd.Flags().GetBool("decrypt")
+
+	client := ssm.NewFromConfig(awsConfig)
+
+	out, err := client.GetParameter(context.TODO(), &ssm.GetParameterInput{
+		Name:           &path,
+		WithDecryption: decrypt,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	val := *out.Parameter.Value
+
+	if strings.HasSuffix(val, "\n") {
+		val = strings.TrimSuffix(val, "\n")
+	}
+
+	fmt.Println(val)
+}
+
+func init() {
+	getCmd.Flags().BoolP("decrypt", "d", true, "decrypt \"SecureString\" value")
+
+	rootCmd.AddCommand(getCmd)
+}