cloudflared-mirror/cmd/cloudflared/access/token.go

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package access
import (
"fmt"
"io/ioutil"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
"github.com/cloudflare/cloudflared/cmd/cloudflared/transfer"
"github.com/cloudflare/cloudflared/log"
"github.com/coreos/go-oidc/jose"
"github.com/coreos/go-oidc/oidc"
homedir "github.com/mitchellh/go-homedir"
)
var logger = log.CreateLogger()
// FetchToken will either load a stored token or generate a new one
func FetchToken(appURL *url.URL) (string, error) {
if token, err := getTokenIfExists(appURL); token != "" && err == nil {
return token, nil
}
path, err := generateFilePathForTokenURL(appURL)
if err != nil {
return "", err
}
// this weird parameter is the resource name (token) and the key/value
// we want to send to the transfer service. the key is token and the value
// is blank (basically just the id generated in the transfer service)
const resourceName, key, value = "token", "token", ""
token, err := transfer.Run(appURL, resourceName, key, value, path, true)
if err != nil {
return "", err
}
return string(token), nil
}
// getTokenIfExists will return the token from local storage if it exists
func getTokenIfExists(url *url.URL) (string, error) {
path, err := generateFilePathForTokenURL(url)
if err != nil {
return "", err
}
content, err := ioutil.ReadFile(path)
if err != nil {
return "", err
}
token, err := jose.ParseJWT(string(content))
if err != nil {
return "", err
}
claims, err := token.Claims()
if err != nil {
return "", err
}
ident, err := oidc.IdentityFromClaims(claims)
if err == nil && ident.ExpiresAt.After(time.Now()) {
return token.Encode(), nil
}
return "", err
}
// generateFilePathForTokenURL will return a filepath for given access application url
func generateFilePathForTokenURL(url *url.URL) (string, error) {
configPath, err := homedir.Expand(config.DefaultConfigDirs[0])
if err != nil {
return "", err
}
ok, err := config.FileExists(configPath)
if !ok && err == nil {
// create config directory if doesn't already exist
err = os.Mkdir(configPath, 0700)
}
if err != nil {
return "", err
}
name := strings.Replace(fmt.Sprintf("%s%s-token", url.Hostname(), url.EscapedPath()), "/", "-", -1)
return filepath.Join(configPath, name), nil
}