Initial commit

vendor/github.com/emersion/go-sasl/xoauth2.go

@@ -0,0 +1,48 @@
+package sasl
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// The XOAUTH2 mechanism name.
+const Xoauth2 = "XOAUTH2"
+
+// An XOAUTH2 error.
+type Xoauth2Error struct {
+	Status string `json:"status"`
+	Schemes string `json:"schemes"`
+	Scope string `json:"scope"`
+}
+
+// Implements error.
+func (err *Xoauth2Error) Error() string {
+	return fmt.Sprintf("XOAUTH2 authentication error (%v)", err.Status)
+}
+
+type xoauth2Client struct {
+	Username string
+	Token string
+}
+
+func (a *xoauth2Client) Start() (mech string, ir []byte, err error) {
+	mech = Xoauth2
+	ir = []byte("user=" + a.Username + "\x01auth=Bearer " + a.Token + "\x01\x01")
+	return
+}
+
+func (a *xoauth2Client) Next(challenge []byte) ([]byte, error) {
+	// Server sent an error response
+	xoauth2Err := &Xoauth2Error{}
+	if err := json.Unmarshal(challenge, xoauth2Err); err != nil {
+		return nil, err
+	} else {
+		return nil, xoauth2Err
+	}
+}
+
+// An implementation of the XOAUTH2 authentication mechanism, as
+// described in https://developers.google.com/gmail/xoauth2_protocol.
+func NewXoauth2Client(username, token string) Client {
+	return &xoauth2Client{username, token}
+}