Support custom mime type mapping for text files (#16304)

* Support custom mime type mapping for text files

* Apply suggested change to routers/common/repo.go

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

Author: 3 people

Diff for: integrations/download_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"testing"
 
+	"code.gitea.io/gitea/modules/setting"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -62,3 +63,30 @@ func TestDownloadByIDMediaForSVGUsesSecureHeaders(t *testing.T) {
 	assert.Equal(t, "image/svg+xml", resp.HeaderMap.Get("Content-Type"))
 	assert.Equal(t, "nosniff", resp.HeaderMap.Get("X-Content-Type-Options"))
 }
+
+func TestDownloadRawTextFileWithoutMimeTypeMapping(t *testing.T) {
+	defer prepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+
+	req := NewRequest(t, "GET", "/user2/repo2/raw/branch/master/test.xml")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	assert.Equal(t, "text/plain; charset=utf-8", resp.HeaderMap.Get("Content-Type"))
+}
+
+func TestDownloadRawTextFileWithMimeTypeMapping(t *testing.T) {
+	defer prepareTestEnv(t)()
+	setting.MimeTypeMap.Map[".xml"] = "text/xml"
+	setting.MimeTypeMap.Enabled = true
+
+	session := loginUser(t, "user2")
+
+	req := NewRequest(t, "GET", "/user2/repo2/raw/branch/master/test.xml")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	assert.Equal(t, "text/xml; charset=utf-8", resp.HeaderMap.Get("Content-Type"))
+
+	delete(setting.MimeTypeMap.Map, ".xml")
+	setting.MimeTypeMap.Enabled = false
+}

Diff for: integrations/gitea-repositories-meta/user2/repo2.git/objects/10/32bbf17fbc0d9c95bb5418dabe8f8c99278700

@@ -0,0 +1,2 @@
+x
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+�0Eg�%��":u��􊕦J|������p˭�Q��~%�9ل����G6G� �ͦw(��E4}*���{�)`YƆ�l�e�MJO�ܚ>�����%��^��ݿ�L�!]�N[v#E�6�U~/���0Z��U'�
gpJ5

Diff for: integrations/gitea-repositories-meta/user2/repo2.git/objects/26/f842bcad37fa40a1bb34cbb5ee219ee35d863d

@@ -1 +1 @@
-205ac761f3326a7ebe416e8673760016450b5cec
+1032bbf17fbc0d9c95bb5418dabe8f8c99278700

Diff for: integrations/gitea-repositories-meta/user2/repo2.git/objects/ba/1aed4e2ea2443d76cec241b96be4ec990852ec

@@ -64,16 +64,26 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)
 
 	st := typesniffer.DetectContentType(buf)
 
+	mappedMimeType := ""
+	if setting.MimeTypeMap.Enabled {
+		fileExtension := strings.ToLower(filepath.Ext(name))
+		mappedMimeType = setting.MimeTypeMap.Map[fileExtension]
+	}
 	if st.IsText() || ctx.QueryBool("render") {
 		cs, err := charset.DetectEncoding(buf)
 		if err != nil {
 			log.Error("Detect raw file %s charset failed: %v, using by default utf-8", name, err)
 			cs = "utf-8"
 		}
-		ctx.Resp.Header().Set("Content-Type", "text/plain; charset="+strings.ToLower(cs))
+		if mappedMimeType == "" {
+			mappedMimeType = "text/plain"
+		}
+		ctx.Resp.Header().Set("Content-Type", mappedMimeType+"; charset="+strings.ToLower(cs))
 	} else {
 		ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
-
+		if mappedMimeType != "" {
+			ctx.Resp.Header().Set("Content-Type", mappedMimeType)
+		}
 		if (st.IsImage() || st.IsPDF()) && (setting.UI.SVG.Enabled || !st.IsSvgImage()) {
 			ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename="%s"`, name))
 			if st.IsSvgImage() {
@@ -83,12 +93,6 @@ func ServeData(ctx *context.Context, name string, size int64, reader io.Reader)
 			}
 		} else {
 			ctx.Resp.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, name))
-			if setting.MimeTypeMap.Enabled {
-				fileExtension := strings.ToLower(filepath.Ext(name))
-				if mimetype, ok := setting.MimeTypeMap.Map[fileExtension]; ok {
-					ctx.Resp.Header().Set("Content-Type", mimetype)
-				}
-			}
 		}
 	}