Add file upload on gist creation/edition (#507)

internal/web/handlers/gist/upload.go

@@ -0,0 +1,77 @@
+package gist
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/google/uuid"
+	"github.com/thomiceli/opengist/internal/config"
+	"github.com/thomiceli/opengist/internal/web/context"
+)
+
+func Upload(ctx *context.Context) error {
+	err := ctx.Request().ParseMultipartForm(32 << 20) // 32 MB max
+	if err != nil {
+		return ctx.ErrorRes(400, ctx.Tr("error.bad-request"), err)
+	}
+
+	fileHeader, err := ctx.FormFile("file")
+	if err != nil {
+		return ctx.ErrorRes(400, ctx.Tr("error.no-file-uploaded"), err)
+	}
+
+	file, err := fileHeader.Open()
+	if err != nil {
+		return ctx.ErrorRes(400, ctx.Tr("error.cannot-open-file"), err)
+	}
+	defer file.Close()
+
+	fileUUID, err := uuid.NewRandom()
+	if err != nil {
+		return ctx.ErrorRes(500, "Error generating UUID", err)
+	}
+
+	uploadsDir := filepath.Join(config.GetHomeDir(), "uploads")
+	if err := os.MkdirAll(uploadsDir, 0755); err != nil {
+		return ctx.ErrorRes(500, "Error creating uploads directory", err)
+	}
+
+	filename := fileUUID.String()
+	filePath := filepath.Join(uploadsDir, filename)
+
+	destFile, err := os.Create(filePath)
+	if err != nil {
+		return ctx.ErrorRes(500, "Error creating file", err)
+	}
+	defer destFile.Close()
+
+	if _, err := io.Copy(destFile, file); err != nil {
+		return ctx.ErrorRes(500, "Error saving file", err)
+	}
+
+	return ctx.JSON(200, map[string]string{
+		"uuid":     filename,
+		"filename": fileHeader.Filename,
+	})
+}
+
+func DeleteUpload(ctx *context.Context) error {
+	uuid := ctx.Param("uuid")
+	if uuid == "" {
+		return ctx.ErrorRes(400, ctx.Tr("error.bad-request"), nil)
+	}
+
+	uploadsDir := filepath.Join(config.GetHomeDir(), "uploads")
+	filePath := filepath.Join(uploadsDir, uuid)
+
+	if _, err := os.Stat(filePath); err == nil {
+		if err := os.Remove(filePath); err != nil {
+			return ctx.ErrorRes(500, "Error deleting file", err)
+		}
+	}
+
+	return ctx.JSON(200, map[string]string{
+		"status": "deleted",
+	})
+}