Allow passing ArrayBuffer to http.file()

Part of #1020

js/modules/k6/http/file.go

@@ -21,9 +21,12 @@
 package http
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
+
+	"github.com/loadimpact/k6/js/common"
 )
 
 // FileData represents a binary file requiring multipart request encoding
@@ -40,7 +43,7 @@ func escapeQuotes(s string) string {
 }
 
 // File returns a FileData parameter
-func (h *HTTP) File(data []byte, args ...string) FileData {
+func (h *HTTP) File(ctx context.Context, data interface{}, args ...string) FileData {
 	// supply valid default if filename and content-type are not specified
 	fname, ct := fmt.Sprintf("%d", time.Now().UnixNano()), "application/octet-stream"
 
@@ -52,8 +55,13 @@ func (h *HTTP) File(data []byte, args ...string) FileData {
 		}
 	}
 
+	dt, err := common.ToBytes(data)
+	if err != nil {
+		common.Throw(common.GetRuntime(ctx), err)
+	}
+
 	return FileData{
-		Data:        data,
+		Data:        dt,
 		Filename:    fname,
 		ContentType: ct,
 	}

js/modules/k6/http/file_test.go

@@ -0,0 +1,77 @@
+/*
+ *
+ * k6 - a next-generation load testing tool
+ * Copyright (C) 2021 Load Impact
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package http
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/dop251/goja"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/loadimpact/k6/js/common"
+)
+
+func TestHTTPFile(t *testing.T) {
+	t.Parallel()
+	rt := goja.New()
+	input := []byte{104, 101, 108, 108, 111}
+
+	testCases := []struct {
+		input    interface{}
+		args     []string
+		expected FileData
+		expErr   string
+	}{
+		// We can't really test without specifying a filename argument,
+		// as File() calls time.Now(), so we'd need some time freezing/mocking
+		// or refactoring, or to exclude the field from the assertion.
+		{input, []string{"test.bin"},
+			FileData{Data: input, Filename: "test.bin", ContentType: "application/octet-stream"}, ""},
+		{string(input), []string{"test.txt", "text/plain"},
+			FileData{Data: input, Filename: "test.txt", ContentType: "text/plain"}, ""},
+		{rt.NewArrayBuffer(input), []string{"test-ab.bin"},
+			FileData{Data: input, Filename: "test-ab.bin", ContentType: "application/octet-stream"}, ""},
+		{struct{}{}, []string{}, FileData{}, "invalid type struct {}, expected string, []byte or ArrayBuffer"},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(fmt.Sprintf("%T", tc.input), func(t *testing.T) {
+			if tc.expErr != "" {
+				defer func() {
+					err := recover()
+					require.NotNil(t, err)
+					require.IsType(t, &goja.Object{}, err)
+					require.IsType(t, map[string]interface{}{}, err.(*goja.Object).Export())
+					val := err.(*goja.Object).Export().(map[string]interface{})
+					assert.Equal(t, tc.expErr, fmt.Sprintf("%s", val["value"]))
+				}()
+			}
+			h := New()
+			ctx := common.WithRuntime(context.Background(), rt)
+			out := h.File(ctx, tc.input, tc.args...)
+			assert.Equal(t, tc.expected, out)
+		})
+	}
+}