add interfaces to remove WriterTo

internal/ext/basicreader.go

@@ -0,0 +1,25 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package ext
+
+import (
+	"io"
+)
+
+// Restrict the underlying io.Reader to only exposed the io.Reader interface.
+// Removes the io.WriterTo interface.
+func NewReadCloser(r io.ReadCloser) io.ReadCloser {
+	return basicReadCloser{r}
+}
+
+type basicReadCloser struct {
+	io.ReadCloser
+}
+
+func NewReader(r io.Reader) io.Reader {
+	return basicReader{r}
+}
+
+type basicReader struct {
+	io.Reader
+}

internal/ext/basicreader_test.go

@@ -0,0 +1,30 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package ext
+
+import (
+	"testing"
+	"github.com/stretchr/testify/assert"
+	"strings"
+_	"fmt"
+_	"log"
+	"io"
+)
+
+func TestNewBasicReader(t *testing.T) {
+	testReader := strings.NewReader("some test data")
+	basicReader := NewReader(testReader)
+	assert.NotNil(t, basicReader)
+	_, ok := basicReader.(io.WriterTo)
+	assert.False(t, ok)
+}
+
+func TestNewBasicReadCloser(t *testing.T) {
+	testReader := strings.NewReader("some test data")
+	basicReader := NewReadCloser(io.NopCloser(testReader))
+	assert.NotNil(t, basicReader)
+	_, ok := basicReader.(io.WriterTo)
+	assert.False(t, ok)
+	_, hasCloser := basicReader.(io.Closer)
+	assert.True(t, hasCloser)
+}

internal/ext/stringreader.go

@@ -0,0 +1,16 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package ext
+
+import (
+	"io"
+	"strings"
+)
+
+func NewStringReader(value string) io.Reader {
+	return stringReader{strings.NewReader(value)}
+}
+
+type stringReader struct {
+	io.Reader
+}

internal/ext/stringreader_test.go

@@ -0,0 +1,18 @@
+// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
+
+package ext
+
+import (
+	"testing"
+	"github.com/stretchr/testify/assert"
+_	"fmt"
+_	"log"
+	"io"
+)
+
+func TestNewStringReader(t *testing.T) {
+	basicReader := NewStringReader("some test data")
+	assert.NotNil(t, basicReader)
+	_, ok := basicReader.(io.WriterTo)
+	assert.False(t, ok)
+}