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/package.go

@@ -0,0 +1,165 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package context
+
+import (
+	"fmt"
+	"net/http"
+
+	"code.gitea.io/gitea/models/organization"
+	packages_model "code.gitea.io/gitea/models/packages"
+	"code.gitea.io/gitea/models/perm"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/templates"
+)
+
+// Package contains owner, access mode and optional the package descriptor
+type Package struct {
+	Owner      *user_model.User
+	AccessMode perm.AccessMode
+	Descriptor *packages_model.PackageDescriptor
+}
+
+type packageAssignmentCtx struct {
+	*Base
+	Doer        *user_model.User
+	ContextUser *user_model.User
+}
+
+// PackageAssignment returns a middleware to handle Context.Package assignment
+func PackageAssignment() func(ctx *Context) {
+	return func(ctx *Context) {
+		errorFn := func(status int, title string, obj any) {
+			err, ok := obj.(error)
+			if !ok {
+				err = fmt.Errorf("%s", obj)
+			}
+			if status == http.StatusNotFound {
+				ctx.NotFound(title, err)
+			} else {
+				ctx.ServerError(title, err)
+			}
+		}
+		paCtx := &packageAssignmentCtx{Base: ctx.Base, Doer: ctx.Doer, ContextUser: ctx.ContextUser}
+		ctx.Package = packageAssignment(paCtx, errorFn)
+	}
+}
+
+// PackageAssignmentAPI returns a middleware to handle Context.Package assignment
+func PackageAssignmentAPI() func(ctx *APIContext) {
+	return func(ctx *APIContext) {
+		paCtx := &packageAssignmentCtx{Base: ctx.Base, Doer: ctx.Doer, ContextUser: ctx.ContextUser}
+		ctx.Package = packageAssignment(paCtx, ctx.Error)
+	}
+}
+
+func packageAssignment(ctx *packageAssignmentCtx, errCb func(int, string, any)) *Package {
+	pkg := &Package{
+		Owner: ctx.ContextUser,
+	}
+	var err error
+	pkg.AccessMode, err = determineAccessMode(ctx.Base, pkg, ctx.Doer)
+	if err != nil {
+		errCb(http.StatusInternalServerError, "determineAccessMode", err)
+		return pkg
+	}
+
+	packageType := ctx.Params("type")
+	name := ctx.Params("name")
+	version := ctx.Params("version")
+	if packageType != "" && name != "" && version != "" {
+		pv, err := packages_model.GetVersionByNameAndVersion(ctx, pkg.Owner.ID, packages_model.Type(packageType), name, version)
+		if err != nil {
+			if err == packages_model.ErrPackageNotExist {
+				errCb(http.StatusNotFound, "GetVersionByNameAndVersion", err)
+			} else {
+				errCb(http.StatusInternalServerError, "GetVersionByNameAndVersion", err)
+			}
+			return pkg
+		}
+
+		pkg.Descriptor, err = packages_model.GetPackageDescriptor(ctx, pv)
+		if err != nil {
+			errCb(http.StatusInternalServerError, "GetPackageDescriptor", err)
+			return pkg
+		}
+	}
+
+	return pkg
+}
+
+func determineAccessMode(ctx *Base, pkg *Package, doer *user_model.User) (perm.AccessMode, error) {
+	if setting.Service.RequireSignInView && (doer == nil || doer.IsGhost()) {
+		return perm.AccessModeNone, nil
+	}
+
+	if doer != nil && !doer.IsGhost() && (!doer.IsActive || doer.ProhibitLogin) {
+		return perm.AccessModeNone, nil
+	}
+
+	// TODO: ActionUser permission check
+	accessMode := perm.AccessModeNone
+	if pkg.Owner.IsOrganization() {
+		org := organization.OrgFromUser(pkg.Owner)
+
+		if doer != nil && !doer.IsGhost() {
+			// 1. If user is logged in, check all team packages permissions
+			var err error
+			accessMode, err = org.GetOrgUserMaxAuthorizeLevel(ctx, doer.ID)
+			if err != nil {
+				return accessMode, err
+			}
+			// If access mode is less than write check every team for more permissions
+			// The minimum possible access mode is read for org members
+			if accessMode < perm.AccessModeWrite {
+				teams, err := organization.GetUserOrgTeams(ctx, org.ID, doer.ID)
+				if err != nil {
+					return accessMode, err
+				}
+				for _, t := range teams {
+					perm := t.UnitAccessMode(ctx, unit.TypePackages)
+					if accessMode < perm {
+						accessMode = perm
+					}
+				}
+			}
+		}
+		if accessMode == perm.AccessModeNone && organization.HasOrgOrUserVisible(ctx, pkg.Owner, doer) {
+			// 2. If user is unauthorized or no org member, check if org is visible
+			accessMode = perm.AccessModeRead
+		}
+	} else {
+		if doer != nil && !doer.IsGhost() {
+			// 1. Check if user is package owner
+			if doer.ID == pkg.Owner.ID {
+				accessMode = perm.AccessModeOwner
+			} else if pkg.Owner.Visibility == structs.VisibleTypePublic || pkg.Owner.Visibility == structs.VisibleTypeLimited { // 2. Check if package owner is public or limited
+				accessMode = perm.AccessModeRead
+			}
+		} else if pkg.Owner.Visibility == structs.VisibleTypePublic { // 3. Check if package owner is public
+			accessMode = perm.AccessModeRead
+		}
+	}
+
+	return accessMode, nil
+}
+
+// PackageContexter initializes a package context for a request.
+func PackageContexter() func(next http.Handler) http.Handler {
+	renderer := templates.HTMLRenderer()
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
+			base, baseCleanUp := NewBaseContext(resp, req)
+			defer baseCleanUp()
+
+			// it is still needed when rendering 500 page in a package handler
+			ctx := NewWebContext(base, renderer, nil)
+			ctx.Base.AppendContextValue(WebContextKey, ctx)
+			next.ServeHTTP(ctx.Resp, ctx.Req)
+		})
+	}
+}