keyhub.go

/* Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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 keyhub

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"time"

	"github.com/coreos/go-oidc"

	"golang.org/x/net/context"
	"golang.org/x/oauth2/clientcredentials"

	"github.com/dghubble/sling"
)

type Client struct {
	ID                 string
	Version            *VersionService
	Accounts           *AccountService
	Groups             *GroupService
	Systems            *SystemService
	ClientApplications *ClientApplicationService
	Vaults             *VaultService
	ServiceAccounts    *ServiceAccountService
	LaunchPadTile      *LaunchPadTileService
	VersionErrors      []error
}

// khJsonBodyProvider encodes a JSON tagged struct value as a Body for requests.
// See https://golang.org/pkg/encoding/json/#MarshalIndent for details.
type khJsonBodyProvider struct {
	payload interface{}
}

func (p khJsonBodyProvider) ContentType() string {
	return ""
}

func (p khJsonBodyProvider) Body() (io.Reader, error) {
	buf := &bytes.Buffer{}
	err := json.NewEncoder(buf).Encode(p.payload)
	if err != nil {
		return nil, err
	}
	return buf, nil
}

func NewClientDefault(issuer string, clientID string, clientSecret string) (*Client, error) {
	http.DefaultClient.Transport = http.DefaultTransport

	if http.DefaultClient.Timeout == 0 {
		http.DefaultClient.Timeout = time.Duration(time.Second * 10)
	}

	return NewClient(http.DefaultClient, issuer, clientID, clientSecret)
}

func NewClient(httpClient *http.Client, issuer string, clientID string, clientSecret string) (*Client, error) {

	var err error
	var baseVersionedSupported bool
	var latestVersionedSupported bool

	base := sling.New().Client(httpClient).Base(issuer)

	versionService := newVersionService(base.New().Set("Accept", "application/json").Set("Content-Type", "application/json"))

	newClient := &Client{
		ID:            clientID,
		Version:       versionService,
		VersionErrors: make([]error, 0),
	}

	// Create sling for contract version 60
	baseVersionedSling := base.New()
	baseVersionedSupported, err = versionService.CheckAndUpdateVersionedSling(60, baseVersionedSling)
	if err != nil {
		newClient.VersionErrors = append(newClient.VersionErrors, err)
	}

	// Create sling for contract version 71
	latestVersionedSling := base.New()
	latestVersionedSupported, err = versionService.CheckAndUpdateVersionedSling(0, latestVersionedSling)
	if err != nil {
		newClient.VersionErrors = append(newClient.VersionErrors, err)
	}

	if !(baseVersionedSupported || latestVersionedSupported) {
		return nil, fmt.Errorf("KeyHub %v does not support api contract versions 60 or Latest", versionService.info.KeyhubVersion)
	}

	ctx := oidc.ClientContext(context.Background(), httpClient)
	provider, err := oidc.NewProvider(ctx, issuer)
	if err != nil {
		return nil, err
	}

	var appClientConf = clientcredentials.Config{
		ClientID:     clientID,
		ClientSecret: clientSecret,
		Scopes:       []string{oidc.ScopeOpenID},
		TokenURL:     provider.Endpoint().TokenURL + "?authVault=access",
	}
	oauth2Client := appClientConf.Client(ctx)
	oauth2Client.Timeout = httpClient.Timeout

	oauth2Sling := baseVersionedSling.New().Client(oauth2Client)

	vaultClient := &http.Client{
		Transport: &Transport{
			Base: oauth2Client.Transport,
		},
	}

	if baseVersionedSupported {
		newClient.Accounts = newAccountService(oauth2Sling.New())
		newClient.ClientApplications = newClientApplicationService(oauth2Sling.New())
		newClient.Systems = newSystemService(oauth2Sling.New())
		newClient.LaunchPadTile = newLaunchPadTileService(oauth2Sling.New())
		newClient.ServiceAccounts = NewServiceAccountService(oauth2Sling)
	}

	if latestVersionedSupported {
		newClient.Groups = newGroupService(latestVersionedSling.New().Client(oauth2Client))
		newClient.Vaults = newVaultService(latestVersionedSling.New().Client(vaultClient))
	}

	return newClient, nil

}