From c4159d895ac399ca55326f7b4ff8bfbf8402e654 Mon Sep 17 00:00:00 2001
From: Jordan <me@jordan.im>
Date: Sat, 4 Feb 2023 23:54:03 -0700
Subject: initial commit

---
 vendor/github.com/emersion/go-sasl/anonymous.go | 56 +++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 vendor/github.com/emersion/go-sasl/anonymous.go

(limited to 'vendor/github.com/emersion/go-sasl/anonymous.go')

diff --git a/vendor/github.com/emersion/go-sasl/anonymous.go b/vendor/github.com/emersion/go-sasl/anonymous.go
new file mode 100644
index 0000000..8ccb817
--- /dev/null
+++ b/vendor/github.com/emersion/go-sasl/anonymous.go
@@ -0,0 +1,56 @@
+package sasl
+
+// The ANONYMOUS mechanism name.
+const Anonymous = "ANONYMOUS"
+
+type anonymousClient struct {
+	Trace string
+}
+
+func (c *anonymousClient) Start() (mech string, ir []byte, err error) {
+	mech = Anonymous
+	ir = []byte(c.Trace)
+	return
+}
+
+func (c *anonymousClient) Next(challenge []byte) (response []byte, err error) {
+	return nil, ErrUnexpectedServerChallenge
+}
+
+// A client implementation of the ANONYMOUS authentication mechanism, as
+// described in RFC 4505.
+func NewAnonymousClient(trace string) Client {
+	return &anonymousClient{trace}
+}
+
+// Get trace information from clients logging in anonymously.
+type AnonymousAuthenticator func(trace string) error
+
+type anonymousServer struct {
+	done bool
+	authenticate AnonymousAuthenticator
+}
+
+func (s *anonymousServer) Next(response []byte) (challenge []byte, done bool, err error) {
+	if s.done {
+		err = ErrUnexpectedClientResponse
+		return
+	}
+
+	// No initial response, send an empty challenge
+	if response == nil {
+		return []byte{}, false, nil
+	}
+
+	s.done = true
+
+	err = s.authenticate(string(response))
+	done = true
+	return
+}
+
+// A server implementation of the ANONYMOUS authentication mechanism, as
+// described in RFC 4505.
+func NewAnonymousServer(authenticator AnonymousAuthenticator) Server {
+	return &anonymousServer{authenticate: authenticator}
+}
-- 
cgit v1.2.3-54-g00ecf