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>

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
+}

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

@@ -0,0 +1,2 @@
+x
<01><>K
+<EFBFBD>0Eg<15>%<25><>":u<><16>􊕦J|<7C><><EFBFBD><EFBFBD><1E><>p˭<70>Q<EFBFBD><51>~%

integrations/gitea-repositories-meta/user2/repo2.git/refs/heads/master

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