Define and use an auth context structure

auth/imap.go

@@ -1,6 +1,7 @@
 package auth
 
 import (
+	"context"
 	"log"
 	"net/http"
 
@@ -54,6 +55,12 @@ func (prov *IMAPProvider) doAuth(next http.Handler,
 		return
 	}
 
+	authCtx := AuthContext{
+		AuthMethod: "imap",
+		UserName:   user,
+	}
+	ctx := context.WithValue(r.Context(), AuthCtxKey, &authCtx)
+	r = r.WithContext(ctx)
 	next.ServeHTTP(w, r)
 }
 

auth/interface.go

@@ -4,6 +4,18 @@ import (
 	"net/http"
 )
 
+var AuthCtxKey = &contextKey{"auth"}
+
+type contextKey struct {
+	name string
+}
+
+type AuthContext struct {
+	AuthMethod string
+	UserName   string
+	// TODO more?
+}
+
 // Abstracts the authentication backend for the server.
 type AuthProvider interface {
 	// Returns HTTP middleware for performing authentication.