Adding http basic authentication middleware

Signed-off-by: Vishal Rana <vr@labstack.com>

middleware/auth_test.go

@@ -0,0 +1,58 @@
+package middleware
+
+import (
+	"encoding/base64"
+	"github.com/labstack/echo"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestBasicAuth(t *testing.T) {
+	req, _ := http.NewRequest(echo.POST, "/", nil)
+	res := &echo.Response{Writer: httptest.NewRecorder()}
+	c := echo.NewContext(req, res, echo.New())
+	fn := func(u, p string) bool {
+		if u == "joe" && p == "secret" {
+			return true
+		}
+		return false
+	}
+	b := BasicAuth(fn)
+
+	//-------------------
+	// Valid credentials
+	//-------------------
+
+	auth := Basic + " " + base64.StdEncoding.EncodeToString([]byte("joe:secret"))
+	req.Header.Set(echo.Authorization, auth)
+	if b(c) != nil {
+		t.Error("basic auth should pass")
+	}
+
+	// Case insensitive
+	auth = "basic " + base64.StdEncoding.EncodeToString([]byte("joe:secret"))
+	req.Header.Set(echo.Authorization, auth)
+	if b(c) != nil {
+		t.Error("basic auth should ignore case and pass")
+	}
+
+	//---------------------
+	// Invalid credentials
+	//---------------------
+
+	auth = Basic + "  " + base64.StdEncoding.EncodeToString([]byte(" joe: secret"))
+	req.Header.Set(echo.Authorization, auth)
+	b = BasicAuth(fn)
+	if b(c) == nil {
+		t.Error("basic auth should fail")
+	}
+
+	// Invalid scheme
+	auth = "foo " + base64.StdEncoding.EncodeToString([]byte(" joe: secret"))
+	req.Header.Set(echo.Authorization, auth)
+	b = BasicAuth(fn)
+	if b(c) == nil {
+		t.Error("basic auth should fail for invalid scheme")
+	}
+}