[Refactor]: Core/API Split (#1506)

Refactors api folder to core, creates firm split between backend code and api frontend.

pkg/utils/file.go

@@ -0,0 +1,81 @@
+package utils
+
+import (
+	"bufio"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"os"
+
+	"github.com/rs/zerolog/log"
+)
+
+func CreateTempFileFromMultipartFile(file *multipart.FileHeader, tempDir string, tempPattern string) (string, error) {
+
+	f, err := file.Open()
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	// Create a temporary file in the requested directory:
+	outputFile, err := os.CreateTemp(tempDir, tempPattern)
+	if err != nil {
+		return "", err
+	}
+	defer outputFile.Close()
+
+	if _, err := io.Copy(outputFile, f); err != nil {
+		log.Debug().Msgf("Audio file copying error %+v - %+v - err %+v", file.Filename, outputFile, err)
+		return "", err
+	}
+
+	return outputFile.Name(), nil
+}
+
+func CreateTempFileFromBase64(base64data string, tempDir string, tempPattern string) (string, error) {
+	if len(base64data) == 0 {
+		return "", fmt.Errorf("base64data empty?")
+	}
+	//base 64 decode the file and write it somewhere
+	// that we will cleanup
+	decoded, err := base64.StdEncoding.DecodeString(base64data)
+	if err != nil {
+		return "", err
+	}
+	// Create a temporary file in the requested directory:
+	outputFile, err := os.CreateTemp(tempDir, tempPattern)
+	if err != nil {
+		return "", err
+	}
+	defer outputFile.Close()
+	// write the base64 result
+	writer := bufio.NewWriter(outputFile)
+	_, err = writer.Write(decoded)
+	if err != nil {
+		return "", err
+	}
+	return outputFile.Name(), nil
+}
+
+func CreateTempFileFromUrl(url string, tempDir string, tempPattern string) (string, error) {
+	// Get the data
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	// Create the file
+	out, err := os.CreateTemp(tempDir, tempPattern)
+	if err != nil {
+		return "", err
+	}
+	defer out.Close()
+
+	// Write the body to file
+	_, err = io.Copy(out, resp.Body)
+	return out.Name(), err
+}