Fix context usage (#33554)

Some old code use direct type-casting to get context, it causes
problems.

This PR fixes all legacy problems and use correct `ctx.Value` to get
low-level contexts.

Fix #33518

Author: wxiaoguang

routers/install/install.go

@@ -64,7 +64,7 @@ func Contexter() func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
 			base := context.NewBaseContext(resp, req)
 			ctx := context.NewWebContext(base, rnd, session.GetSession(req))
-			ctx.SetContextValue(context.WebContextKey, ctx)
+			ctx.SetContextValue(context.WebContextKey, ctx) // FIXME: this should be removed because NewWebContext should already set it
 			ctx.Data.MergeFrom(middleware.CommonTemplateContextData())
 			ctx.Data.MergeFrom(reqctx.ContextData{
 				"Title":          ctx.Locale.Tr("install.install"),

routers/private/internal.go

@@ -88,7 +88,7 @@ func Routes() *web.Router {
 		// Fortunately, the LFS handlers are able to handle requests without a complete web context
 		common.AddOwnerRepoGitLFSRoutes(r, func(ctx *context.PrivateContext) {
 			webContext := &context.Context{Base: ctx.Base}
-			ctx.SetContextValue(context.WebContextKey, webContext)
+			ctx.SetContextValue(context.WebContextKey, webContext) // FIXME: this is not ideal but no other way at the moment
 		})
 	})
 

routers/web/web.go

@@ -1637,7 +1637,7 @@ func registerRoutes(m *web.Router) {
 	}
 
 	m.NotFound(func(w http.ResponseWriter, req *http.Request) {
-		ctx := context.GetWebContext(req)
+		ctx := context.GetWebContext(req.Context())
 		defer routing.RecordFuncInfo(ctx, routing.GetFuncInfo(ctx.NotFound, "WebNotFound"))()
 		ctx.NotFound("", nil)
 	})

services/auth/auth.go

@@ -149,7 +149,7 @@ func handleSignIn(resp http.ResponseWriter, req *http.Request, sess SessionStore
 	middleware.SetLocaleCookie(resp, user.Language, 0)
 
 	// force to generate a new CSRF token
-	if ctx := gitea_context.GetWebContext(req); ctx != nil {
+	if ctx := gitea_context.GetWebContext(req.Context()); ctx != nil {
 		ctx.Csrf.PrepareForSessionUser(ctx)
 	}
 }

services/auth/sspi.go

@@ -88,7 +88,7 @@ func (s *SSPI) Verify(req *http.Request, w http.ResponseWriter, store DataStore,
 		store.GetData()["EnableSSPI"] = true
 		// in this case, the Verify function is called in Gitea's web context
 		// FIXME: it doesn't look good to render the page here, why not redirect?
-		gitea_context.GetWebContext(req).HTML(http.StatusUnauthorized, tplSignIn)
+		gitea_context.GetWebContext(req.Context()).HTML(http.StatusUnauthorized, tplSignIn)
 		return nil, err
 	}
 	if outToken != "" {

services/context/context.go

@@ -79,9 +79,9 @@ type webContextKeyType struct{}
 
 var WebContextKey = webContextKeyType{}
 
-func GetWebContext(req *http.Request) *Context {
-	ctx, _ := req.Context().Value(WebContextKey).(*Context)
-	return ctx
+func GetWebContext(ctx context.Context) *Context {
+	webCtx, _ := ctx.Value(WebContextKey).(*Context)
+	return webCtx
 }
 
 // ValidateContext is a special context for form validation middleware. It may be different from other contexts.
@@ -135,6 +135,7 @@ func NewWebContext(base *Base, render Render, session session.Store) *Context {
 	}
 	ctx.TemplateContext = NewTemplateContextForWeb(ctx)
 	ctx.Flash = &middleware.Flash{DataStore: ctx, Values: url.Values{}}
+	ctx.SetContextValue(WebContextKey, ctx)
 	return ctx
 }
 
@@ -165,7 +166,7 @@ func Contexter() func(next http.Handler) http.Handler {
 			ctx.PageData = map[string]any{}
 			ctx.Data["PageData"] = ctx.PageData
 
-			ctx.Base.SetContextValue(WebContextKey, ctx)
+			ctx.Base.SetContextValue(WebContextKey, ctx) // FIXME: this should be removed because NewWebContext should already set it
 			ctx.Csrf = NewCSRFProtector(csrfOpts)
 
 			// get the last flash message from cookie

services/context/package.go

@@ -156,7 +156,7 @@ func PackageContexter() func(next http.Handler) http.Handler {
 			base := NewBaseContext(resp, req)
 			// it is still needed when rendering 500 page in a package handler
 			ctx := NewWebContext(base, renderer, nil)
-			ctx.SetContextValue(WebContextKey, ctx)
+			ctx.SetContextValue(WebContextKey, ctx) // FIXME: this should be removed because NewWebContext should already set it
 			next.ServeHTTP(ctx.Resp, ctx.Req)
 		})
 	}

services/contexttest/context_tests.go

@@ -67,7 +67,7 @@ func MockContext(t *testing.T, reqPath string, opts ...MockContextOption) (*cont
 
 	chiCtx := chi.NewRouteContext()
 	ctx := context.NewWebContext(base, opt.Render, nil)
-	ctx.SetContextValue(context.WebContextKey, ctx)
+	ctx.SetContextValue(context.WebContextKey, ctx) // FIXME: this should be removed because NewWebContext should already set it
 	ctx.SetContextValue(chi.RouteCtxKey, chiCtx)
 	if opt.SessionStore != nil {
 		ctx.SetContextValue(session.MockStoreContextKey, opt.SessionStore)

services/markup/renderhelper.go

@@ -21,8 +21,8 @@ func FormalRenderHelperFuncs() *markup.RenderHelperFuncs {
 				return false
 			}
 
-			giteaCtx, ok := ctx.(*gitea_context.Context)
-			if !ok {
+			giteaCtx := gitea_context.GetWebContext(ctx)
+			if giteaCtx == nil {
 				// when using general context, use user's visibility to check
 				return mentionedUser.Visibility.IsPublic()
 			}

services/markup/renderhelper_codepreview.go

@@ -36,8 +36,8 @@ func renderRepoFileCodePreview(ctx context.Context, opts markup.RenderCodePrevie
 		return "", err
 	}
 
-	webCtx, ok := ctx.Value(gitea_context.WebContextKey).(*gitea_context.Context)
-	if !ok {
+	webCtx := gitea_context.GetWebContext(ctx)
+	if webCtx == nil {
 		return "", fmt.Errorf("context is not a web context")
 	}
 	doer := webCtx.Doer

services/markup/renderhelper_issueicontitle.go

@@ -18,8 +18,8 @@ import (
 )
 
 func renderRepoIssueIconTitle(ctx context.Context, opts markup.RenderIssueIconTitleOptions) (_ template.HTML, err error) {
-	webCtx, ok := ctx.Value(gitea_context.WebContextKey).(*gitea_context.Context)
-	if !ok {
+	webCtx := gitea_context.GetWebContext(ctx)
+	if webCtx == nil {
 		return "", fmt.Errorf("context is not a web context")
 	}