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Use upstream yaegashi/msgraph.go/msauth (msteams) (#1067)

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vendor/github.com/matterbridge/msgraph.go/LICENSE generated vendored
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70
vendor/github.com/matterbridge/msgraph.go/msauth/README.md generated vendored
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# msauth
## Introduction
Very simple package to authorize applications against [Microsoft identity platform].
It utilizes [v2.0 endpoint] so that it can authorize users using both personal (Microsoft) and organizational (Azure AD) account.
## Usage
### Device authorization grant
- [OAuth 2.0 device authorization grant flow]
```go
const (
tenantID = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
clientID = "YYYYYYYY-YYYY-YYYY-YYYY-YYYYYYYYYYYY"
tokenCachePath = "token_cache.json"
)
var scopes = []string{"openid", "profile", "offline_access", "User.Read", "Files.Read"}
ctx := context.Background()
m := msauth.NewManager()
m.LoadFile(tokenCachePath)
ts, err := m.DeviceAuthorizationGrant(ctx, tenantID, clientID, scopes, nil)
if err != nil {
log.Fatal(err)
}
m.SaveFile(tokenCachePath)
httpClient := oauth2.NewClient(ctx, ts)
...
```
### Client credentials grant
- [OAuth 2.0 client credentials grant flow]
```go
const (
tenantID = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
clientID = "YYYYYYYY-YYYY-YYYY-YYYY-YYYYYYYYYYYY"
clientSecret = "ZZZZZZZZZZZZZZZZZZZZZZZZ"
)
var scopes = []string{msauth.DefaultMSGraphScope}
ctx := context.Background()
m := msauth.NewManager()
ts, err := m.ClientCredentialsGrant(ctx, tenantID, clientID, clientSecret, scopes)
if err != nil {
log.Fatal(err)
}
httpClient := oauth2.NewClient(ctx, ts)
...
```
### Authorization code grant
- [OAuth 2.0 authorization code grant flow]
- Not yet implemented.
[Microsoft identity platform]: https://docs.microsoft.com/en-us/azure/active-directory/develop/
[v2.0 endpoint]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-overview
[OAuth 2.0 device authorization grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-device-code
[OAuth 2.0 client credentials grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow
[OAuth 2.0 authorization code grant flow]: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-auth-code-flow

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vendor/github.com/matterbridge/msgraph.go/msauth/client_credentials_grant.go generated vendored
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package msauth
import (
"context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/clientcredentials"
"golang.org/x/oauth2/microsoft"
)
// ClientCredentialsGrant performs OAuth 2.0 client credentials grant and returns auto-refreshing TokenSource
func (m *Manager) ClientCredentialsGrant(ctx context.Context, tenantID, clientID, clientSecret string, scopes []string) (oauth2.TokenSource, error) {
config := &clientcredentials.Config{
ClientID: clientID,
ClientSecret: clientSecret,
TokenURL: microsoft.AzureADEndpoint(tenantID).TokenURL,
Scopes: scopes,
AuthStyle: oauth2.AuthStyleInParams,
}
var err error
ts := config.TokenSource(ctx)
_, err = ts.Token()
if err != nil {
return nil, err
}
return ts, nil
}

96
vendor/github.com/matterbridge/msgraph.go/msauth/device_authorization_grant.go generated vendored
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package msauth
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/microsoft"
)
const (
deviceCodeGrantType = "urn:ietf:params:oauth:grant-type:device_code"
authorizationPendingError = "authorization_pending"
)
// DeviceCode is returned on device auth initiation
type DeviceCode struct {
DeviceCode string `json:"device_code"`
UserCode string `json:"user_code"`
VerificationURL string `json:"verification_url"`
ExpiresIn int `json:"expires_in"`
Interval int `json:"interval"`
Message string `json:"message"`
}
// DeviceAuthorizationGrant performs OAuth 2.0 device authorization grant and returns auto-refreshing TokenSource
func (m *Manager) DeviceAuthorizationGrant(ctx context.Context, tenantID, clientID string, scopes []string, callback func(*DeviceCode) error) (oauth2.TokenSource, error) {
endpoint := microsoft.AzureADEndpoint(tenantID)
endpoint.AuthStyle = oauth2.AuthStyleInParams
config := &oauth2.Config{
ClientID: clientID,
Endpoint: endpoint,
Scopes: scopes,
}
if t, ok := m.TokenCache[generateKey(tenantID, clientID)]; ok {
tt, err := config.TokenSource(ctx, t).Token()
if err == nil {
return config.TokenSource(ctx, tt), nil
}
if _, ok := err.(*oauth2.RetrieveError); !ok {
return nil, err
}
}
scope := strings.Join(scopes, " ")
res, err := http.PostForm(deviceCodeURL(tenantID), url.Values{"client_id": {clientID}, "scope": {scope}})
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
b, _ := ioutil.ReadAll(res.Body)
return nil, fmt.Errorf("%s: %s", res.Status, string(b))
}
dc := &DeviceCode{}
dec := json.NewDecoder(res.Body)
err = dec.Decode(&dc)
if err != nil {
return nil, err
}
if callback != nil {
err = callback(dc)
if err != nil {
return nil, err
}
} else {
fmt.Fprintln(os.Stderr, dc.Message)
}
values := url.Values{
"client_id": {clientID},
"grant_type": {deviceCodeGrantType},
"device_code": {dc.DeviceCode},
}
interval := dc.Interval
if interval == 0 {
interval = 5
}
for {
time.Sleep(time.Second * time.Duration(interval))
token, err := m.requestToken(ctx, tenantID, clientID, values)
if err == nil {
m.Cache(tenantID, clientID, token)
return config.TokenSource(ctx, token), nil
}
tokenError, ok := err.(*TokenError)
if !ok || tokenError.ErrorObject != authorizationPendingError {
return nil, err
}
}
}

148
vendor/github.com/matterbridge/msgraph.go/msauth/msauth.go generated vendored
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// Package msauth implements a library to authorize against Microsoft identity platform:
// https://docs.microsoft.com/en-us/azure/active-directory/develop/
//
// It utilizes v2.0 endpoint
// so it can authorize users with both personal (Microsoft) and organizational (Azure AD) account.
package msauth
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"sync"
"time"
"golang.org/x/oauth2"
)
const (
// DefaultMSGraphScope is the default scope for MS Graph API
DefaultMSGraphScope = "https://graph.microsoft.com/.default"
endpointURLFormat = "https://login.microsoftonline.com/%s/oauth2/v2.0/%s"
)
// TokenError is returned on failed authentication
type TokenError struct {
ErrorObject string `json:"error"`
ErrorDescription string `json:"error_description"`
}
// Error implements error interface
func (t *TokenError) Error() string {
return fmt.Sprintf("%s: %s", t.ErrorObject, t.ErrorDescription)
}
func generateKey(tenantID, clientID string) string {
return fmt.Sprintf("%s:%s", tenantID, clientID)
}
func deviceCodeURL(tenantID string) string {
return fmt.Sprintf(endpointURLFormat, tenantID, "devicecode")
}
func tokenURL(tenantID string) string {
return fmt.Sprintf(endpointURLFormat, tenantID, "token")
}
type tokenJSON struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int `json:"expires_in"`
}
func (e *tokenJSON) expiry() (t time.Time) {
if v := e.ExpiresIn; v != 0 {
return time.Now().Add(time.Duration(v) * time.Second)
}
return
}
// Manager is oauth2 token cache manager
type Manager struct {
mu sync.Mutex
TokenCache map[string]*oauth2.Token
}
// NewManager returns a new Manager instance
func NewManager() *Manager {
return &Manager{TokenCache: map[string]*oauth2.Token{}}
}
// LoadBytes loads token cache from opaque bytes (it's actually JSON)
func (m *Manager) LoadBytes(b []byte) error {
m.mu.Lock()
defer m.mu.Unlock()
return json.Unmarshal(b, &m.TokenCache)
}
// SaveBytes saves token cache to opaque bytes (it's actually JSON)
func (m *Manager) SaveBytes() ([]byte, error) {
m.mu.Lock()
defer m.mu.Unlock()
return json.Marshal(m.TokenCache)
}
// LoadFile loads token cache from file
func (m *Manager) LoadFile(path string) error {
b, err := ioutil.ReadFile(path)
if err != nil {
return err
}
return m.LoadBytes(b)
}
// SaveFile saves token cache to file
func (m *Manager) SaveFile(path string) error {
b, err := m.SaveBytes()
if err != nil {
return err
}
return ioutil.WriteFile(path, b, 0644)
}
// Cache stores a token into token cache
func (m *Manager) Cache(tenantID, clientID string, token *oauth2.Token) {
m.TokenCache[generateKey(tenantID, clientID)] = token
}
// requestToken requests a token from the token endpoint
// TODO(ctx): use http client from ctx
func (m *Manager) requestToken(ctx context.Context, tenantID, clientID string, values url.Values) (*oauth2.Token, error) {
res, err := http.PostForm(tokenURL(tenantID), values)
if err != nil {
return nil, err
}
defer res.Body.Close()
b, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
if res.StatusCode != http.StatusOK {
var terr *TokenError
err = json.Unmarshal(b, &terr)
if err != nil {
return nil, err
}
return nil, terr
}
var tj *tokenJSON
err = json.Unmarshal(b, &tj)
if err != nil {
return nil, err
}
token := &oauth2.Token{
AccessToken: tj.AccessToken,
TokenType: tj.TokenType,
RefreshToken: tj.RefreshToken,
Expiry: tj.expiry(),
}
if token.AccessToken == "" {
return nil, errors.New("msauth: server response missing access_token")
}
return token, nil
}