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server.go
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server.go
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package main
import (
"fmt"
"net/http"
"os"
"strings"
vault "github.com/hashicorp/vault/api"
"github.com/labstack/echo/v4"
"github.com/labstack/echo/v4/middleware"
"github.com/spf13/viper"
)
type Client struct {
*vault.Client
Endpoint string `json:"endpoint"`
OrgSecretPath string `json:"org_secret_path"`
RoleID string `json:"role_id"`
SecretID string `json:"secret_id"`
ServiceSecretPath string `json:"service_secret_path"`
ServiceTransitPath string `json:"service_transit_path"`
SpaceSecretPath string `json:"space_secret_path"`
}
func stripFirst(path string) string {
comps := strings.Split(path, "/")
if len(comps) > 2 {
return "/" + strings.Join(comps[2:], "/")
}
return ""
}
func (v *Client) ReadSpaceSecret(path string) (*vault.Secret, error) {
return v.Client.Logical().Read(stripFirst(v.SpaceSecretPath) + "/" + path)
}
func (v *Client) ReadServiceSecret(path string) (*vault.Secret, error) {
return v.Client.Logical().Read(stripFirst(v.ServiceSecretPath) + "/" + path)
}
func (v *Client) ReadServiceTransit(path string) (*vault.Secret, error) {
return v.Client.Logical().Read(stripFirst(v.ServiceTransitPath) + "/" + path)
}
func main() {
var err error
var secret *vault.Secret
viper.SetEnvPrefix("vread")
viper.SetDefault("endpoint", "")
viper.SetDefault("role_id", "")
viper.SetDefault("secret_id", "")
viper.SetDefault("org_secret_path", "")
viper.SetDefault("space_secret_path", "")
viper.SetDefault("service_secret_path", "")
viper.SetDefault("service_transit_path", "")
viper.AutomaticEnv()
var client = Client{
Endpoint: viper.GetString("endpoint"),
RoleID: viper.GetString("role_id"),
SecretID: viper.GetString("secret_id"),
OrgSecretPath: viper.GetString("org_secret_path"),
SpaceSecretPath: viper.GetString("space_secret_path"),
ServiceSecretPath: viper.GetString("service_secret_path"),
ServiceTransitPath: viper.GetString("service_transit_path"),
}
client.Client, err = vault.NewClient(vault.DefaultConfig())
if err != nil {
fmt.Printf("error creating vault client: %v\n", err)
return
}
_ = client.SetAddress(client.Endpoint)
secret, err = client.Logical().Write("auth/approle/login", map[string]interface{}{
"role_id": client.RoleID,
"secret_id": client.SecretID,
})
if err != nil {
fmt.Printf("error authenticating against vault: %v\n", err)
return
}
if secret == nil {
fmt.Printf("login failed\n")
return
}
client.SetToken(secret.Auth.ClientToken)
secret, _ = client.Auth().Token().RenewSelf(1800)
listenString := ":8080"
// Echo instance
e := echo.New()
// Middleware
e.Use(middleware.Logger())
e.Use(middleware.Recover())
// Routes
e.Any("/vault/read/:namespace/:key", vaultReader(client))
if port := os.Getenv("PORT"); port != "" {
listenString = ":" + port
}
e.Logger.Fatal(e.Start(listenString))
}
func vaultReader(client Client) func(ctx echo.Context) error {
return func(c echo.Context) error {
var err error
var secret *vault.Secret
namespace := c.Param("namespace")
key := c.Param("key")
switch namespace {
case "space":
secret, err = client.ReadSpaceSecret(key)
case "service":
secret, err = client.ReadServiceSecret(key)
case "transit":
secret, err = client.ReadServiceTransit(key)
default:
err = fmt.Errorf("unsupported namespace: %s", namespace)
}
if err != nil {
return c.JSON(http.StatusBadRequest, map[string]interface{}{"message": err.Error()})
}
if secret != nil {
return c.JSON(http.StatusOK, secret.Data)
}
return c.JSON(http.StatusNoContent, "{}")
}
}