Move context from modules to services (#29440)

Since `modules/context` has to depend on `models` and many other
packages, it should be moved from `modules/context` to
`services/context` according to design principles. There is no logic
code change on this PR, only move packages.

- Move `code.gitea.io/gitea/modules/context` to
`code.gitea.io/gitea/services/context`
- Move `code.gitea.io/gitea/modules/contexttest` to
`code.gitea.io/gitea/services/contexttest` because of depending on
context
- Move `code.gitea.io/gitea/modules/upload` to
`code.gitea.io/gitea/services/context/upload` because of depending on
context

(cherry picked from commit 29f149bd9f517225a3c9f1ca3fb0a7b5325af696)

Conflicts:
	routers/api/packages/alpine/alpine.go
	routers/api/v1/repo/issue_reaction.go
	routers/install/install.go
	routers/web/admin/config.go
	routers/web/passkey.go
	routers/web/repo/search.go
	routers/web/repo/setting/default_branch.go
	routers/web/user/home.go
	routers/web/user/profile.go
	tests/integration/editor_test.go
	tests/integration/integration_test.go
	tests/integration/mirror_push_test.go
	trivial context conflicts
	also modified all other occurrences in Forgejo specific files

services/context/private.go

@@ -0,0 +1,85 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package context
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"time"
+
+	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/process"
+	"code.gitea.io/gitea/modules/web"
+	web_types "code.gitea.io/gitea/modules/web/types"
+)
+
+// PrivateContext represents a context for private routes
+type PrivateContext struct {
+	*Base
+	Override context.Context
+
+	Repo *Repository
+}
+
+func init() {
+	web.RegisterResponseStatusProvider[*PrivateContext](func(req *http.Request) web_types.ResponseStatusProvider {
+		return req.Context().Value(privateContextKey).(*PrivateContext)
+	})
+}
+
+// Deadline is part of the interface for context.Context and we pass this to the request context
+func (ctx *PrivateContext) Deadline() (deadline time.Time, ok bool) {
+	if ctx.Override != nil {
+		return ctx.Override.Deadline()
+	}
+	return ctx.Base.Deadline()
+}
+
+// Done is part of the interface for context.Context and we pass this to the request context
+func (ctx *PrivateContext) Done() <-chan struct{} {
+	if ctx.Override != nil {
+		return ctx.Override.Done()
+	}
+	return ctx.Base.Done()
+}
+
+// Err is part of the interface for context.Context and we pass this to the request context
+func (ctx *PrivateContext) Err() error {
+	if ctx.Override != nil {
+		return ctx.Override.Err()
+	}
+	return ctx.Base.Err()
+}
+
+var privateContextKey any = "default_private_context"
+
+// GetPrivateContext returns a context for Private routes
+func GetPrivateContext(req *http.Request) *PrivateContext {
+	return req.Context().Value(privateContextKey).(*PrivateContext)
+}
+
+// PrivateContexter returns apicontext as middleware
+func PrivateContexter() func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			base, baseCleanUp := NewBaseContext(w, req)
+			ctx := &PrivateContext{Base: base}
+			defer baseCleanUp()
+			ctx.Base.AppendContextValue(privateContextKey, ctx)
+
+			next.ServeHTTP(ctx.Resp, ctx.Req)
+		})
+	}
+}
+
+// OverrideContext overrides the underlying request context for Done() etc.
+// This function should be used when there is a need for work to continue even if the request has been cancelled.
+// Primarily this affects hook/post-receive and hook/proc-receive both of which need to continue working even if
+// the underlying request has timed out from the ssh/http push
+func OverrideContext(ctx *PrivateContext) (cancel context.CancelFunc) {
+	// We now need to override the request context as the base for our work because even if the request is cancelled we have to continue this work
+	ctx.Override, _, cancel = process.GetManager().AddTypedContext(graceful.GetManager().HammerContext(), fmt.Sprintf("PrivateContext: %s", ctx.Req.RequestURI), process.RequestProcessType, true)
+	return cancel
+}