From f4c3f1e15e6d726c1f9a9bf1a953036a563e5cc6 Mon Sep 17 00:00:00 2001
From: Pierre-Olivier Mercier <nemunaire@nemunai.re>
Date: Mon, 21 Nov 2022 12:02:36 +0100
Subject: [PATCH] sync: Create empty file for nginx gzip-static module

---
 admin/static.go              |  1 +
 admin/sync/exercice_files.go | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/admin/static.go b/admin/static.go
index c91e17b2..09cff9d3 100644
--- a/admin/static.go
+++ b/admin/static.go
@@ -101,6 +101,7 @@ func declareStaticRoutes(router *gin.RouterGroup, cfg *settings.Settings, baseUR
 	})
 
 	router.GET("/files/*_", func(c *gin.Context) {
+		// TODO: handle .gz file here
 		http.ServeFile(c.Writer, c.Request, path.Join(fic.FilesDir, strings.TrimPrefix(c.Request.URL.Path, path.Join(baseURL, "files"))))
 	})
 	router.GET("/submissions/*_", func(c *gin.Context) {
diff --git a/admin/sync/exercice_files.go b/admin/sync/exercice_files.go
index 84cf8c61..00623228 100644
--- a/admin/sync/exercice_files.go
+++ b/admin/sync/exercice_files.go
@@ -4,7 +4,9 @@ import (
 	"bufio"
 	"encoding/hex"
 	"fmt"
+	"log"
 	"net/http"
+	"os"
 	"path"
 	"strings"
 	"unicode"
@@ -173,12 +175,32 @@ func SyncExerciceFiles(i Importer, exercice *fic.Exercice, exceptions *CheckExce
 		} else if f.(*fic.EFile).Size == 0 {
 			errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("imported file is empty!")))
 		} else {
+			file := f.(*fic.EFile)
+
 			// Call checks hooks
 			for _, h := range hooks.fileHooks {
-				for _, e := range h(f.(*fic.EFile), exceptions) {
+				for _, e := range h(file, exceptions) {
 					errs = append(errs, NewFileError(exercice, fname, e))
 				}
 			}
+
+			// Create empty non-gziped file for nginx gzip-static module
+			if len(file.ChecksumShown) > 0 && strings.HasSuffix(file.Name, ".gz") {
+				file.Name = strings.TrimSuffix(file.Name, ".gz")
+				file.Path = strings.TrimSuffix(file.Path, ".gz")
+
+				fd, err := os.Create(path.Join(fic.FilesDir, file.Path))
+				if err == nil {
+					fd.Close()
+
+					_, err = file.Update()
+					if err != nil {
+						log.Println("Unable to update file after .gz removal:", err.Error())
+					}
+				} else {
+					log.Printf("Unable to create %q: %s", file.Path, err)
+				}
+			}
 		}
 	}
 	return