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client.go
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client.go
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package api
import (
"errors"
"fmt"
"net/http"
"net/url"
"os"
"strings"
"sync"
)
var (
errRedirect = errors.New("redirect")
defaultHTTPClientSetup sync.Once
defaultHTTPClient = &http.Client{}
)
// Config is used to configure the creation of the client.
type Config struct {
// Address is the address of the Vault server. This should be a complete
// URL such as "http://vault.example.com". If you need a custom SSL
// cert or want to enable insecure mode, you need to specify a custom
// HttpClient.
Address string
// HttpClient is the HTTP client to use, which will currently always have the
// same values as http.DefaultClient. This is used to control redirect behavior.
HttpClient *http.Client
}
// DefaultConfig returns a default configuration for the client. It is
// safe to modify the return value of this function.
//
// The default Address is https://127.0.0.1:8200, but this can be overridden by
// setting the `VAULT_ADDR` environment variable.
func DefaultConfig() *Config {
config := &Config{
Address: "https://127.0.0.1:8200",
HttpClient: defaultHTTPClient,
}
if addr := os.Getenv("VAULT_ADDR"); addr != "" {
config.Address = addr
}
return config
}
// Client is the client to the Vault API. Create a client with
// NewClient.
type Client struct {
addr *url.URL
config *Config
token string
}
// NewClient returns a new client for the given configuration.
//
// If the environment variable `VAULT_TOKEN` is present, the token will be
// automatically added to the client. Otherwise, you must manually call
// `SetToken()`.
func NewClient(c *Config) (*Client, error) {
u, err := url.Parse(c.Address)
if err != nil {
return nil, err
}
if c.HttpClient == defaultHTTPClient {
defaultHTTPClientSetup.Do(func() {
// Ensure redirects are not automatically followed
c.HttpClient.CheckRedirect = func(req *http.Request, via []*http.Request) error {
return errRedirect
}
})
}
client := &Client{
addr: u,
config: c,
}
if token := os.Getenv("VAULT_TOKEN"); token != "" {
client.SetToken(token)
}
return client, nil
}
// Token returns the access token being used by this client. It will
// return the empty string if there is no token set.
func (c *Client) Token() string {
return c.token
}
// SetToken sets the token directly. This won't perform any auth
// verification, it simply sets the token properly for future requests.
func (c *Client) SetToken(v string) {
c.token = v
}
// ClearToken deletes the token if it is set or does nothing otherwise.
func (c *Client) ClearToken() {
c.token = ""
}
// NewRequest creates a new raw request object to query the Vault server
// configured for this client. This is an advanced method and generally
// doesn't need to be called externally.
func (c *Client) NewRequest(method, path string) *Request {
req := &Request{
Method: method,
URL: &url.URL{
Scheme: c.addr.Scheme,
Host: c.addr.Host,
Path: path,
},
ClientToken: c.token,
Params: make(map[string][]string),
}
return req
}
// RawRequest performs the raw request given. This request may be against
// a Vault server not configured with this client. This is an advanced operation
// that generally won't need to be called externally.
func (c *Client) RawRequest(r *Request) (*Response, error) {
redirectCount := 0
START:
req, err := r.ToHTTP()
if err != nil {
return nil, err
}
var result *Response
resp, err := c.config.HttpClient.Do(req)
if resp != nil {
result = &Response{Response: resp}
}
if err != nil {
if urlErr, ok := err.(*url.Error); ok && urlErr.Err == errRedirect {
err = nil
} else if strings.Contains(err.Error(), "tls: oversized") {
err = fmt.Errorf(
"%s\n\n"+
"This error usually means that the server is running with TLS disabled\n"+
"but the client is configured to use TLS. Please either enable TLS\n"+
"on the server or run the client with -address set to an address\n"+
"that uses the http protocol:\n\n"+
" vault <command> -address http://<address>\n\n"+
"You can also set the VAULT_ADDR environment variable:\n\n\n"+
" VAULT_ADDR=http://<address> vault <command>\n\n"+
"where <address> is replaced by the actual address to the server.",
err)
}
}
if err != nil {
return result, err
}
// Check for a redirect, only allowing for a single redirect
if (resp.StatusCode == 302 || resp.StatusCode == 307) && redirectCount == 0 {
// Parse the updated location
respLoc, err := resp.Location()
if err != nil {
return result, err
}
// Ensure a protocol downgrade doesn't happen
if req.URL.Scheme == "https" && respLoc.Scheme != "https" {
return result, fmt.Errorf("redirect would cause protocol downgrade")
}
// Update the request
r.URL = respLoc
// Reset the request body if any
if err := r.ResetJSONBody(); err != nil {
return result, err
}
// Retry the request
redirectCount++
goto START
}
if err := result.Error(); err != nil {
return result, err
}
return result, nil
}