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brightbox_auth.go
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brightbox_auth.go
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// Copyright 2020 Brightbox Systems Ltd
//
// 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 k8ssdk
import (
"context"
"fmt"
"os"
"github.com/brightbox/k8ssdk/cached"
"golang.org/x/oauth2"
"golang.org/x/oauth2/clientcredentials"
klog "k8s.io/klog/v2"
)
const (
defaultClientID = "app-dkmch"
defaultClientSecret = "uogoelzgt0nwawb"
clientEnvVar = "BRIGHTBOX_CLIENT"
clientSecretEnvVar = "BRIGHTBOX_CLIENT_SECRET"
usernameEnvVar = "BRIGHTBOX_USER_NAME"
passwordEnvVar = "BRIGHTBOX_PASSWORD"
accountEnvVar = "BRIGHTBOX_ACCOUNT"
apiURLEnvVar = "BRIGHTBOX_API_URL"
defaultTimeoutSeconds = 10
ValidAcmeDomainStatus = "valid"
)
var infrastructureScope = []string{"infrastructure"}
type authdetails struct {
APIClient string
APISecret string
UserName string
password string
Account string
APIURL string
}
// obtainCloudClient creates a new Brightbox client using details from
// the environment
func obtainCloudClient() (CloudAccess, error) {
klog.V(4).Infof("obtainCloudClient")
config := &authdetails{
APIClient: getenvWithDefault(clientEnvVar,
defaultClientID),
APISecret: getenvWithDefault(clientSecretEnvVar,
defaultClientSecret),
UserName: os.Getenv(usernameEnvVar),
password: os.Getenv(passwordEnvVar),
Account: os.Getenv(accountEnvVar),
APIURL: os.Getenv(apiURLEnvVar),
}
err := config.validateConfig()
if err != nil {
return nil, err
}
return config.authenticatedClient()
}
// Validate account config entries
func (authd *authdetails) validateConfig() error {
klog.V(4).Infof("validateConfig")
if authd.APIClient == defaultClientID &&
authd.APISecret == defaultClientSecret {
if authd.Account == "" {
return fmt.Errorf("must specify Account with User Credentials")
}
} else {
if authd.UserName != "" || authd.password != "" {
return fmt.Errorf("User Credentials not used with API Client")
}
}
return nil
}
// Authenticate the details and return a client
func (authd *authdetails) authenticatedClient() (CloudAccess, error) {
ctx := context.Background()
switch {
case authd.UserName != "" || authd.password != "":
return authd.tokenisedAuth(ctx)
default:
return authd.apiClientAuth(ctx)
}
}
func (authd *authdetails) tokenURL() string {
return authd.APIURL + "/token"
}
func (authd *authdetails) tokenisedAuth(ctx context.Context) (CloudAccess, error) {
conf := oauth2.Config{
ClientID: authd.APIClient,
ClientSecret: authd.APISecret,
Scopes: infrastructureScope,
Endpoint: oauth2.Endpoint{
TokenURL: authd.tokenURL(),
AuthStyle: oauth2.AuthStyleInHeader,
},
}
klog.V(4).Infof("Obtaining authentication for user %s", authd.UserName)
klog.V(4).Infof("Speaking to %s", authd.tokenURL())
token, err := conf.PasswordCredentialsToken(ctx, authd.UserName, authd.password)
if err != nil {
return nil, err
}
klog.V(4).Infof("Refreshing current token as required")
oauthConnection := conf.Client(ctx, token)
return cached.NewClient(authd.APIURL, authd.Account, oauthConnection)
}
func (authd *authdetails) apiClientAuth(ctx context.Context) (CloudAccess, error) {
conf := clientcredentials.Config{
ClientID: authd.APIClient,
ClientSecret: authd.APISecret,
Scopes: infrastructureScope,
TokenURL: authd.tokenURL(),
}
klog.V(4).Infof("Obtaining API client authorisation for client %s", authd.APIClient)
klog.V(4).Infof("Speaking to %s", authd.tokenURL())
oauthConnection := conf.Client(ctx)
return cached.NewClient(authd.APIURL, authd.Account, oauthConnection)
}