Add whisper 1 support (#117)

* Add whisper 1 support

* Resolve linting issues for audio source files

audio.go

@@ -0,0 +1,100 @@
+package gogpt
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"os"
+)
+
+// Whisper Defines the models provided by OpenAI to use when processing audio with OpenAI.
+const (
+	Whisper1 = "whisper-1"
+)
+
+// AudioRequest represents a request structure for audio API.
+type AudioRequest struct {
+	Model    string
+	FilePath string
+}
+
+// AudioResponse represents a response structure for audio API.
+type AudioResponse struct {
+	Text string `json:"text"`
+}
+
+// CreateTranscription — API call to create a transcription. Returns transcribed text.
+func (c *Client) CreateTranscription(
+	ctx context.Context,
+	request AudioRequest,
+) (response AudioResponse, err error) {
+	response, err = c.callAudioAPI(ctx, request, "transcriptions")
+	return
+}
+
+// CreateTranscription — API call to create a transcription. Returns transcribed text.
+func (c *Client) CreateTranslation(
+	ctx context.Context,
+	request AudioRequest,
+) (response AudioResponse, err error) {
+	response, err = c.callAudioAPI(ctx, request, "translations")
+	return
+}
+
+// callAudioAPI — API call to an audio endpoint.
+func (c *Client) callAudioAPI(
+	ctx context.Context,
+	request AudioRequest,
+	endpointSuffix string,
+) (response AudioResponse, err error) {
+	var formBody bytes.Buffer
+	w := multipart.NewWriter(&formBody)
+
+	if err = audioMultipartForm(request, w); err != nil {
+		return
+	}
+
+	urlSuffix := fmt.Sprintf("/audio/%s", endpointSuffix)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.fullURL(urlSuffix), &formBody)
+	if err != nil {
+		return
+	}
+	req.Header.Add("Content-Type", w.FormDataContentType())
+
+	err = c.sendRequest(req, &response)
+	return
+}
+
+// audioMultipartForm creates a form with audio file contents and the name of the model to use for
+// audio processing.
+func audioMultipartForm(request AudioRequest, w *multipart.Writer) error {
+	f, err := os.Open(request.FilePath)
+	if err != nil {
+		return fmt.Errorf("opening audio file: %w", err)
+	}
+
+	fw, err := w.CreateFormFile("file", f.Name())
+	if err != nil {
+		return fmt.Errorf("creating form file: %w", err)
+	}
+
+	if _, err = io.Copy(fw, f); err != nil {
+		return fmt.Errorf("reading from opened audio file: %w", err)
+	}
+
+	fw, err = w.CreateFormField("model")
+	if err != nil {
+		return fmt.Errorf("creating form field: %w", err)
+	}
+
+	modelName := bytes.NewReader([]byte(request.Model))
+	if _, err = io.Copy(fw, modelName); err != nil {
+		return fmt.Errorf("writing model name: %w", err)
+	}
+	w.Close()
+
+	return nil
+}