1 files changed, 148 insertions, 0 deletions
diff --git a/vendor/github.com/matterbridge/msgraph.go/msauth/msauth.go b/vendor/github.com/matterbridge/msgraph.go/msauth/msauth.go
new file mode 100644
index 00000000..c2a86985
--- /dev/null
+++ b/vendor/github.com/matterbridge/msgraph.go/msauth/msauth.go
@@ -0,0 +1,148 @@
+// 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
+}