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|
package vault
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"regexp"
"time"
)
// logFatal is defined so log.Fatal calls can be overridden for testing
var logFatal = log.Fatal
// Client -
type Client struct {
Addr *url.URL
Auth AuthStrategy
// The cached auth token
token string
hc *http.Client
}
// AuthStrategy -
type AuthStrategy interface {
fmt.Stringer
GetToken(addr *url.URL) (string, error)
Revokable() bool
}
// NewClient - instantiate a new
func NewClient() *Client {
u := getVaultAddr()
auth := getAuthStrategy()
return &Client{u, auth, "", nil}
}
func getVaultAddr() *url.URL {
vu := os.Getenv("VAULT_ADDR")
if vu == "" {
logFatal("VAULT_ADDR is an unparseable URL!")
return nil
}
u, err := url.Parse(vu)
if err != nil {
logFatal("VAULT_ADDR is an unparseable URL!", err)
return nil
}
return u
}
func getAuthStrategy() AuthStrategy {
if auth := NewAppIDAuthStrategy(); auth != nil {
return auth
}
if auth := NewGitHubAuthStrategy(); auth != nil {
return auth
}
if auth := NewUserPassAuthStrategy(); auth != nil {
return auth
}
if auth := NewTokenAuthStrategy(); auth != nil {
return auth
}
logFatal("No vault auth strategy configured")
return nil
}
// GetHTTPClient returns a client configured w/X-Vault-Token header
func (c *Client) GetHTTPClient() *http.Client {
if c.hc == nil {
c.hc = &http.Client{
Timeout: time.Second * 5,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
c.SetToken(req)
return nil
},
}
}
return c.hc
}
// SetToken adds an X-Vault-Token header to the request
func (c *Client) SetToken(req *http.Request) {
req.Header.Set("X-Vault-Token", c.token)
}
// Do wraps http.Client.Do
func (c *Client) Do(req *http.Request) (*http.Response, error) {
hc := c.GetHTTPClient()
return hc.Do(req)
}
// Login - log in to Vault with the discovered auth backend and save the token
func (c *Client) Login() error {
token, err := c.Auth.GetToken(c.Addr)
if err != nil {
logFatal(err)
return err
}
c.token = token
return nil
}
// RevokeToken - revoke the current auth token - effectively logging out
func (c *Client) RevokeToken() {
// only do it if the auth strategy supports it!
if !c.Auth.Revokable() {
return
}
u := &url.URL{}
*u = *c.Addr
u.Path = "/v1/auth/token/revoke-self"
res, err := requestAndFollow(c, "POST", u, nil)
if err != nil {
log.Println("Error while revoking Vault Token", err)
}
if res.StatusCode != 204 {
log.Printf("Unexpected HTTP status %d on RevokeToken from %s (token was %s)", res.StatusCode, u, c.token)
}
}
func (c *Client) Read(path string) ([]byte, error) {
path = normalizeURLPath(path)
u := &url.URL{}
*u = *c.Addr
u.Path = "/v1" + path
res, err := requestAndFollow(c, "GET", u, nil)
if err != nil {
return nil, err
}
body, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
err = fmt.Errorf("Unexpected HTTP status %d on Read from %s: %s", res.StatusCode, path, body)
return nil, err
}
response := make(map[string]interface{})
err = json.Unmarshal(body, &response)
if err != nil {
log.Println("argh - couldn't decode the response", err)
return nil, err
}
if _, ok := response["data"]; !ok {
return nil, fmt.Errorf("Unexpected HTTP body on Read for %s: %s", path, body)
}
return json.Marshal(response["data"])
}
var rxDupSlashes = regexp.MustCompile(`/{2,}`)
func normalizeURLPath(path string) string {
if len(path) > 0 {
path = rxDupSlashes.ReplaceAllString(path, "/")
}
return path
}
// ReadResponse -
type ReadResponse struct {
Data struct {
Value string `json:"value"`
} `json:"data"`
}
|
