Restore CORS on git smart http protocol (#16496) (#16506)

Backport #16496

Unfortunately the chi changes have resulted in the CORS headers for the
git smart http protocol going missing.

This is mostly because the OPTIONS method is not being handled by
httpBase anymore.

This PR adds a GetOptions, PostOptions and Options methods to web
handler to allow OPTIONS method requests to still reach the httpBase
function.

Fix #16350
Close #16491

Signed-off-by: Andrew Thornton <art27@cantab.net>

2 files changed, 31 insertions, 11 deletions

diff --git a/modules/web/route.go b/modules/web/route.go
index 319d08f598..3c6513da62 100644
--- a/modules/web/route.go
+++ b/modules/web/route.go
@@ -269,6 +269,26 @@ func (r *Route) Get(pattern string, h ...interface{}) {
 	r.R.Get(r.getPattern(pattern), Wrap(middlewares...))
 }
 
+// Options delegate options method
+func (r *Route) Options(pattern string, h ...interface{}) {
+	var middlewares = r.getMiddlewares(h)
+	r.R.Options(r.getPattern(pattern), Wrap(middlewares...))
+}
+
+// GetOptions delegate get and options method
+func (r *Route) GetOptions(pattern string, h ...interface{}) {
+	var middlewares = r.getMiddlewares(h)
+	r.R.Get(r.getPattern(pattern), Wrap(middlewares...))
+	r.R.Options(r.getPattern(pattern), Wrap(middlewares...))
+}
+
+// PostOptions delegate post and options method
+func (r *Route) PostOptions(pattern string, h ...interface{}) {
+	var middlewares = r.getMiddlewares(h)
+	r.R.Post(r.getPattern(pattern), Wrap(middlewares...))
+	r.R.Options(r.getPattern(pattern), Wrap(middlewares...))
+}
+
 // Head delegate head method
 func (r *Route) Head(pattern string, h ...interface{}) {
 	var middlewares = r.getMiddlewares(h)
diff --git a/routers/web/web.go b/routers/web/web.go
index 7a47f479c0..9baef52962 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -1006,17 +1006,17 @@ func RegisterRoutes(m *web.Route) {
 			}, ignSignInAndCsrf, lfsServerEnabled)
 
 			m.Group("", func() {
-				m.Post("/git-upload-pack", repo.ServiceUploadPack)
-				m.Post("/git-receive-pack", repo.ServiceReceivePack)
-				m.Get("/info/refs", repo.GetInfoRefs)
-				m.Get("/HEAD", repo.GetTextFile("HEAD"))
-				m.Get("/objects/info/alternates", repo.GetTextFile("objects/info/alternates"))
-				m.Get("/objects/info/http-alternates", repo.GetTextFile("objects/info/http-alternates"))
-				m.Get("/objects/info/packs", repo.GetInfoPacks)
-				m.Get("/objects/info/{file:[^/]*}", repo.GetTextFile(""))
-				m.Get("/objects/{head:[0-9a-f]{2}}/{hash:[0-9a-f]{38}}", repo.GetLooseObject)
-				m.Get("/objects/pack/pack-{file:[0-9a-f]{40}}.pack", repo.GetPackFile)
-				m.Get("/objects/pack/pack-{file:[0-9a-f]{40}}.idx", repo.GetIdxFile)
+				m.PostOptions("/git-upload-pack", repo.ServiceUploadPack)
+				m.PostOptions("/git-receive-pack", repo.ServiceReceivePack)
+				m.GetOptions("/info/refs", repo.GetInfoRefs)
+				m.GetOptions("/HEAD", repo.GetTextFile("HEAD"))
+				m.GetOptions("/objects/info/alternates", repo.GetTextFile("objects/info/alternates"))
+				m.GetOptions("/objects/info/http-alternates", repo.GetTextFile("objects/info/http-alternates"))
+				m.GetOptions("/objects/info/packs", repo.GetInfoPacks)
+				m.GetOptions("/objects/info/{file:[^/]*}", repo.GetTextFile(""))
+				m.GetOptions("/objects/{head:[0-9a-f]{2}}/{hash:[0-9a-f]{38}}", repo.GetLooseObject)
+				m.GetOptions("/objects/pack/pack-{file:[0-9a-f]{40}}.pack", repo.GetPackFile)
+				m.GetOptions("/objects/pack/pack-{file:[0-9a-f]{40}}.idx", repo.GetIdxFile)
 			}, ignSignInAndCsrf)
 
 			m.Head("/tasks/trigger", repo.TriggerTask)