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Copy pathweb_env.go
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187 lines (164 loc) · 4.64 KB
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/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package env
import (
"context"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"regexp"
"strings"
"time"
"github.com/dgrijalva/jwt-go"
)
const (
webEnvScheme = "env"
webEnvSchemeSecure = "env+tls"
)
var (
globalRootCAs *x509.CertPool
)
// RegisterGlobalCAs register the global root CAs
func RegisterGloba
B682
lCAs(CAs *x509.CertPool) {
globalRootCAs = CAs
}
var (
hostKeys = regexp.MustCompile("^(https?://)(.*?):(.*?)@(.*?)$")
)
func fetchHTTPConstituentParts(u *url.URL) (username string, password string, envURL string, err error) {
envURL = u.String()
if hostKeys.MatchString(envURL) {
parts := hostKeys.FindStringSubmatch(envURL)
if len(parts) != 5 {
return "", "", "", errors.New("invalid arguments")
}
username = parts[2]
password = parts[3]
envURL = fmt.Sprintf("%s%s", parts[1], parts[4])
}
if username == "" && password == "" && u.User != nil {
username = u.User.Username()
password, _ = u.User.Password()
}
return username, password, envURL, nil
}
func getEnvValueFromHTTP(urlStr, envKey string) (string, string, string, error) {
u, err := url.Parse(urlStr)
if err != nil {
return "", "", "", err
}
switch u.Scheme {
case webEnvScheme:
u.Scheme = "http"
case webEnvSchemeSecure:
u.Scheme = "https"
default:
return "", "", "", errors.New("invalid arguments")
}
username, password, envURL, err := fetchHTTPConstituentParts(u)
if err != nil {
return "", "", "", err
}
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, envURL+"?key="+envKey, nil)
if err != nil {
return "", "", "", err
}
claims := &jwt.StandardClaims{
ExpiresAt: int64(15 * time.Minute),
Issuer: username,
Subject: envKey,
}
token := jwt.NewWithClaims(jwt.SigningMethodHS512, claims)
ss, err := token.SignedString([]byte(password))
if err != nil {
return "", "", "", err
}
req.Header.Set("Authorization", "Bearer "+ss)
clnt := &http.Client{
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 3 * time.Second,
KeepAlive: 5 * time.Second,
}).DialContext,
ResponseHeaderTimeout: 3 * time.Second,
TLSHandshakeTimeout: 3 * time.Second,
ExpectContinueTimeout: 3 * time.Second,
TLSClientConfig: &tls.Config{
RootCAs: globalRootCAs,
},
// Go net/http automatically unzip if content-type is
// gzip disable this feature, as we are always interested
// in raw stream.
DisableCompression: true,
},
}
resp, err := clnt.Do(req)
if err != nil {
return "", "", "", err
}
envValueBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", "", "", err
}
return string(envValueBytes), username, password, nil
}
// Environ returns a copy of strings representing the
// environment, in the form "key=value".
func Environ() []string {
return os.Environ()
}
// LookupEnv retrieves the value of the environment variable
// named by the key. If the variable is present in the
// environment the value (which may be empty) is returned
// and the boolean is true. Otherwise the returned value
// will be empty and the boolean will be false.
//
// Additionally if the input is env://username:password@remote:port/
// to fetch ENV values for the env value from a remote server.
// In this case, it also returns the credentials username and password
func LookupEnv(key string) (string, string, string, bool) {
v, ok := os.LookupEnv(key)
if ok && strings.HasPrefix(v, webEnvScheme) {
// If env value starts with `env*://`
// continue to parse and fetch from remote
var err error
v, user, pwd, err := getEnvValueFromHTTP(strings.TrimSpace(v), key)
if err != nil {
env, eok := os.LookupEnv("_" + key)
if eok {
// fallback to cached value if-any.
return env, user, pwd, eok
}
}
// Set the ENV value to _env value,
// this value is a fallback in-case of
// server restarts when webhook server
// is down.
os.Setenv("_"+key, v)
return v, user, pwd, true
}
return v, "", "", ok
}