Add projects

backend/internal/translator/common/file_data.go

@@ -0,0 +1,43 @@
+package common
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/router-for-me/CLIProxyAPI/v7/internal/misc"
+)
+
+// NormalizeOpenAIFileData returns the MIME type and raw base64 payload for OpenAI file content.
+func NormalizeOpenAIFileData(filename, fallbackMIMEType, fileData string) (mimeType, data string, ok bool) {
+	if fileData == "" {
+		return "", "", false
+	}
+
+	if fallbackMIMEType == "" {
+		ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(filename), "."))
+		fallbackMIMEType = misc.MimeTypes[ext]
+	}
+	const dataURLPrefix = "data:"
+	if len(fileData) < len(dataURLPrefix) || !strings.EqualFold(fileData[:len(dataURLPrefix)], dataURLPrefix) {
+		if fallbackMIMEType == "" {
+			return "", "", false
+		}
+		return fallbackMIMEType, fileData, true
+	}
+
+	metadata, payload, found := strings.Cut(fileData[len(dataURLPrefix):], ",")
+	if !found || payload == "" {
+		return "", "", false
+	}
+	fields := strings.Split(metadata, ";")
+	mimeType = strings.TrimSpace(fields[0])
+	if mimeType == "" {
+		return "", "", false
+	}
+	for _, field := range fields[1:] {
+		if strings.EqualFold(strings.TrimSpace(field), "base64") {
+			return mimeType, payload, true
+		}
+	}
+	return "", "", false
+}