Added delimiter configuration (#34)

basculehttp/constructor.go

@@ -16,10 +16,15 @@ const (
 	// DefaultHeaderName is the http header to get the authorization
 	// information from.
 	DefaultHeaderName = "Authorization"
+
+	// DefaultHeaderDelimiter is the character between the authorization and
+	// its key.
+	DefaultHeaderDelimiter = " "
 )
 
 type constructor struct {
 	headerName      string
+	headerDelimiter string
 	authorizations  map[bascule.Authorization]TokenFactory
 	getLogger       func(context.Context) bascule.Logger
 	onErrorResponse OnErrorResponse
@@ -39,7 +44,7 @@ func (c *constructor) decorate(next http.Handler) http.Handler {
 			return
 		}
 
-		i := strings.IndexByte(authorization, ' ')
+		i := strings.Index(authorization, c.headerDelimiter)
 		if i < 1 {
 			err := errors.New("unexpected authorization header value")
 			c.error(logger, InvalidHeader, authorization, err)
@@ -60,7 +65,7 @@ func (c *constructor) decorate(next http.Handler) http.Handler {
 		}
 
 		ctx := request.Context()
-		token, err := tf.ParseAndValidate(ctx, request, key, authorization[i+1:])
+		token, err := tf.ParseAndValidate(ctx, request, key, authorization[i+len(c.headerDelimiter):])
 		if err != nil {
 			c.error(logger, ParseFailed, authorization, err)
 			WriteResponse(response, http.StatusForbidden, err)
@@ -100,8 +105,14 @@ func WithHeaderName(headerName string) COption {
 	return func(c *constructor) {
 		if len(headerName) > 0 {
 			c.headerName = headerName
-		} else {
-			c.headerName = DefaultHeaderName
+		}
+	}
+}
+
+func WithHeaderDelimiter(delimiter string) COption {
+	return func(c *constructor) {
+		if len(delimiter) > 0 {
+			c.headerDelimiter = delimiter
 		}
 	}
 }
@@ -134,6 +145,7 @@ func WithCErrorResponseFunc(f OnErrorResponse) COption {
 func NewConstructor(options ...COption) func(http.Handler) http.Handler {
 	c := &constructor{
 		headerName:      DefaultHeaderName,
+		headerDelimiter: DefaultHeaderDelimiter,
 		authorizations:  make(map[bascule.Authorization]TokenFactory),
 		getLogger:       bascule.GetDefaultLoggerFunc,
 		onErrorResponse: DefaultOnErrorResponse,

basculehttp/constructor_test.go

@@ -14,8 +14,10 @@ import (
 
 func TestConstructor(t *testing.T) {
 	testHeader := "test header"
+	testDelimiter := "="
 	c := NewConstructor(
 		WithHeaderName(testHeader),
+		WithHeaderDelimiter(testDelimiter),
 		WithTokenFactory("Basic", BasicTokenFactory{"codex": "codex"}),
 		WithCLogger(func(_ context.Context) bascule.Logger {
 			return bascule.Logger(log.NewJSONLogger(log.NewSyncWriter(os.Stdout)))
@@ -24,6 +26,7 @@ func TestConstructor(t *testing.T) {
 	)
 	c2 := NewConstructor(
 		WithHeaderName(""),
+		WithHeaderDelimiter(""),
 		WithCLogger(func(_ context.Context) bascule.Logger { return nil }),
 	)
 	tests := []struct {
@@ -37,7 +40,7 @@ func TestConstructor(t *testing.T) {
 			description:        "Success",
 			constructor:        c,
 			requestHeaderKey:   testHeader,
-			requestHeaderValue: "Basic Y29kZXg6Y29kZXg=",
+			requestHeaderValue: "Basic=Y29kZXg6Y29kZXg=",
 			expectedStatusCode: http.StatusOK,
 		},
 		{
@@ -65,7 +68,7 @@ func TestConstructor(t *testing.T) {
 			description:        "Parse and Validate Error",
 			constructor:        c,
 			requestHeaderKey:   testHeader,
-			requestHeaderValue: "Basic AFJDK",
+			requestHeaderValue: "Basic=AFJDK",
 			expectedStatusCode: http.StatusForbidden,
 		},
 	}