update image api *os.File to io.Reader (#994)

* update image api *os.File to io.Reader

* update code style

* add reader test

* supplementary reader test

* update the reader in the form builder test

* add commnet

* update comment

* update code style

image.go

@@ -3,8 +3,8 @@ package openai
 import (
 	"bytes"
 	"context"
+	"io"
 	"net/http"
-	"os"
 	"strconv"
 )
 
@@ -134,8 +134,8 @@ func (c *Client) CreateImage(ctx context.Context, request ImageRequest) (respons
 
 // ImageEditRequest represents the request structure for the image API.
 type ImageEditRequest struct {
-	Image          *os.File `json:"image,omitempty"`
+	Image          io.Reader `json:"image,omitempty"`
-	Mask           *os.File `json:"mask,omitempty"`
+	Mask           io.Reader `json:"mask,omitempty"`
 	Prompt         string    `json:"prompt,omitempty"`
 	Model          string    `json:"model,omitempty"`
 	N              int       `json:"n,omitempty"`
@@ -150,15 +150,16 @@ func (c *Client) CreateEditImage(ctx context.Context, request ImageEditRequest)
 	body := &bytes.Buffer{}
 	builder := c.createFormBuilder(body)
 
-	// image
+	// image, filename is not required
-	err = builder.CreateFormFile("image", request.Image)
+	err = builder.CreateFormFileReader("image", request.Image, "")
 	if err != nil {
 		return
 	}
 
 	// mask, it is optional
 	if request.Mask != nil {
-		err = builder.CreateFormFile("mask", request.Mask)
+		// mask, filename is not required
+		err = builder.CreateFormFileReader("mask", request.Mask, "")
 		if err != nil {
 			return
 		}
@@ -206,7 +207,7 @@ func (c *Client) CreateEditImage(ctx context.Context, request ImageEditRequest)
 
 // ImageVariRequest represents the request structure for the image API.
 type ImageVariRequest struct {
-	Image          *os.File `json:"image,omitempty"`
+	Image          io.Reader `json:"image,omitempty"`
 	Model          string    `json:"model,omitempty"`
 	N              int       `json:"n,omitempty"`
 	Size           string    `json:"size,omitempty"`
@@ -220,8 +221,8 @@ func (c *Client) CreateVariImage(ctx context.Context, request ImageVariRequest)
 	body := &bytes.Buffer{}
 	builder := c.createFormBuilder(body)
 
-	// image
+	// image, filename is not required
-	err = builder.CreateFormFile("image", request.Image)
+	err = builder.CreateFormFileReader("image", request.Image, "")
 	if err != nil {
 		return
 	}

image_test.go

@@ -54,13 +54,13 @@ func TestImageFormBuilderFailures(t *testing.T) {
 	}
 
 	mockFailedErr := fmt.Errorf("mock form builder fail")
-	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
+	mockBuilder.mockCreateFormFileReader = func(string, io.Reader, string) error {
 		return mockFailedErr
 	}
 	_, err := client.CreateEditImage(ctx, req)
 	checks.ErrorIs(t, err, mockFailedErr, "CreateImage should return error if form builder fails")
 
-	mockBuilder.mockCreateFormFile = func(name string, _ *os.File) error {
+	mockBuilder.mockCreateFormFileReader = func(name string, _ io.Reader, _ string) error {
 		if name == "mask" {
 			return mockFailedErr
 		}
@@ -119,13 +119,13 @@ func TestVariImageFormBuilderFailures(t *testing.T) {
 	req := ImageVariRequest{}
 
 	mockFailedErr := fmt.Errorf("mock form builder fail")
-	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
+	mockBuilder.mockCreateFormFileReader = func(string, io.Reader, string) error {
 		return mockFailedErr
 	}
 	_, err := client.CreateVariImage(ctx, req)
 	checks.ErrorIs(t, err, mockFailedErr, "CreateVariImage should return error if form builder fails")
 
-	mockBuilder.mockCreateFormFile = func(string, *os.File) error {
+	mockBuilder.mockCreateFormFileReader = func(string, io.Reader, string) error {
 		return nil
 	}
 

internal/form_builder.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"io"
 	"mime/multipart"
+	"net/textproto"
 	"os"
-	"path"
+	"path/filepath"
+	"strings"
 )
 
 type FormBuilder interface {
@@ -30,8 +32,37 @@ func (fb *DefaultFormBuilder) CreateFormFile(fieldname string, file *os.File) er
 	return fb.createFormFile(fieldname, file, file.Name())
 }
 
+var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
+
+func escapeQuotes(s string) string {
+	return quoteEscaper.Replace(s)
+}
+
+// CreateFormFileReader creates a form field with a file reader.
+// The filename in parameters can be an empty string.
+// The filename in Content-Disposition is required, But it can be an empty string.
 func (fb *DefaultFormBuilder) CreateFormFileReader(fieldname string, r io.Reader, filename string) error {
-	return fb.createFormFile(fieldname, r, path.Base(filename))
+	h := make(textproto.MIMEHeader)
+	h.Set(
+		"Content-Disposition",
+		fmt.Sprintf(
+			`form-data; name="%s"; filename="%s"`,
+			escapeQuotes(fieldname),
+			escapeQuotes(filepath.Base(filename)),
+		),
+	)
+
+	fieldWriter, err := fb.writer.CreatePart(h)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(fieldWriter, r)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 func (fb *DefaultFormBuilder) createFormFile(fieldname string, r io.Reader, filename string) error {

internal/form_builder_test.go

@@ -43,3 +43,32 @@ func TestFormBuilderWithClosedFile(t *testing.T) {
 	checks.HasError(t, err, "formbuilder should return error if file is closed")
 	checks.ErrorIs(t, err, os.ErrClosed, "formbuilder should return error if file is closed")
 }
+
+type failingReader struct {
+}
+
+var errMockFailingReaderError = errors.New("mock reader failed")
+
+func (*failingReader) Read([]byte) (int, error) {
+	return 0, errMockFailingReaderError
+}
+
+func TestFormBuilderWithReader(t *testing.T) {
+	file, err := os.CreateTemp(t.TempDir(), "")
+	if err != nil {
+		t.Fatalf("Error creating tmp file: %v", err)
+	}
+	defer file.Close()
+	builder := NewFormBuilder(&failingWriter{})
+	err = builder.CreateFormFileReader("file", file, file.Name())
+	checks.ErrorIs(t, err, errMockFailingWriterError, "formbuilder should return error if writer fails")
+
+	builder = NewFormBuilder(&bytes.Buffer{})
+	reader := &failingReader{}
+	err = builder.CreateFormFileReader("file", reader, "")
+	checks.ErrorIs(t, err, errMockFailingReaderError, "formbuilder should return error if copy reader fails")
+
+	successReader := &bytes.Buffer{}
+	err = builder.CreateFormFileReader("file", successReader, "")
+	checks.NoError(t, err, "formbuilder should not return error")
+}