From 59b867dc2dfc1ecb0ee703ff44e1be9c5c53cf86 Mon Sep 17 00:00:00 2001
From: KN4CK3R <admin@oldschoolhack.me>
Date: Sat, 26 Mar 2022 10:04:22 +0100
Subject: [PATCH] Add `ContextUser` to http request context (#18798)

This PR adds a middleware which sets a ContextUser (like GetUserByParams before) in a single place which can be used by other methods. For routes which represent a repo or org the respective middlewares set the field too.

Also fix a bug in modules/context/org.go during refactoring.
---
 integrations/api_user_org_perm_test.go |   2 +-
 modules/context/context.go             |   5 +-
 modules/context/org.go                 |   3 +-
 modules/context/repo.go                |   1 +
 routers/api/v1/admin/org.go            |   8 +-
 routers/api/v1/admin/repo.go           |  10 +-
 routers/api/v1/admin/user.go           |  84 +++++++--------
 routers/api/v1/api.go                  |  17 ++-
 routers/api/v1/org/org.go              |  17 +--
 routers/api/v1/user/follower.go        |  42 ++------
 routers/api/v1/user/gpg_key.go         |   6 +-
 routers/api/v1/user/key.go             |   6 +-
 routers/api/v1/user/repo.go            |   6 +-
 routers/api/v1/user/star.go            |   7 +-
 routers/api/v1/user/user.go            |  17 +--
 routers/api/v1/user/watch.go           |   5 +-
 routers/web/feed/profile.go            |  25 +++--
 routers/web/repo/http.go               |  15 +--
 routers/web/user/home.go               |   8 +-
 routers/web/user/profile.go            | 140 ++++++-------------------
 routers/web/web.go                     |  18 +++-
 services/context/user.go               |  62 +++++++++++
 templates/swagger/v1_json.tmpl         |  66 ++++++------
 23 files changed, 247 insertions(+), 323 deletions(-)
 create mode 100644 services/context/user.go

diff --git a/integrations/api_user_org_perm_test.go b/integrations/api_user_org_perm_test.go
index 0dcdbd77adf2..f4047e72bee7 100644
--- a/integrations/api_user_org_perm_test.go
+++ b/integrations/api_user_org_perm_test.go
@@ -133,7 +133,7 @@ func TestUnknowUser(t *testing.T) {
 
 	var apiError api.APIError
 	DecodeJSON(t, resp, &apiError)
-	assert.Equal(t, "GetUserByName", apiError.Message)
+	assert.Equal(t, "user redirect does not exist [name: unknow]", apiError.Message)
 }
 
 func TestUnknowOrganization(t *testing.T) {
diff --git a/modules/context/context.go b/modules/context/context.go
index 6cd503984f54..eb0edef39435 100644
--- a/modules/context/context.go
+++ b/modules/context/context.go
@@ -67,8 +67,9 @@ type Context struct {
 	IsSigned    bool
 	IsBasicAuth bool
 
-	Repo *Repository
-	Org  *Organization
+	ContextUser *user_model.User
+	Repo        *Repository
+	Org         *Organization
 }
 
 // TrHTMLEscapeArgs runs Tr but pre-escapes all arguments with html.EscapeString.
diff --git a/modules/context/org.go b/modules/context/org.go
index a1080fc0fb62..8e292fa1c547 100644
--- a/modules/context/org.go
+++ b/modules/context/org.go
@@ -53,7 +53,7 @@ func HandleOrgAssignment(ctx *Context, args ...bool) {
 	var err error
 	ctx.Org.Organization, err = models.GetOrgByName(orgName)
 	if err != nil {
-		if user_model.IsErrUserNotExist(err) {
+		if models.IsErrOrgNotExist(err) {
 			redirectUserID, err := user_model.LookupUserRedirect(orgName)
 			if err == nil {
 				RedirectToUser(ctx, orgName, redirectUserID)
@@ -68,6 +68,7 @@ func HandleOrgAssignment(ctx *Context, args ...bool) {
 		return
 	}
 	org := ctx.Org.Organization
+	ctx.ContextUser = org.AsUser()
 	ctx.Data["Org"] = org
 
 	teams, err := org.LoadTeams()
diff --git a/modules/context/repo.go b/modules/context/repo.go
index b345decf7e11..ccdc810fb690 100644
--- a/modules/context/repo.go
+++ b/modules/context/repo.go
@@ -439,6 +439,7 @@ func RepoAssignment(ctx *Context) (cancel context.CancelFunc) {
 		}
 	}
 	ctx.Repo.Owner = owner
+	ctx.ContextUser = owner
 	ctx.Data["Username"] = ctx.Repo.Owner.Name
 
 	// redirect link to wiki
diff --git a/routers/api/v1/admin/org.go b/routers/api/v1/admin/org.go
index 4ebfe9863c01..e4850ac49456 100644
--- a/routers/api/v1/admin/org.go
+++ b/routers/api/v1/admin/org.go
@@ -15,7 +15,6 @@ import (
 	"code.gitea.io/gitea/modules/convert"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/web"
-	"code.gitea.io/gitea/routers/api/v1/user"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 )
 
@@ -45,11 +44,8 @@ func CreateOrg(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	form := web.GetForm(ctx).(*api.CreateOrgOption)
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
 
 	visibility := api.VisibleTypePublic
 	if form.Visibility != "" {
@@ -67,7 +63,7 @@ func CreateOrg(ctx *context.APIContext) {
 		Visibility:  visibility,
 	}
 
-	if err := models.CreateOrganization(org, u); err != nil {
+	if err := models.CreateOrganization(org, ctx.ContextUser); err != nil {
 		if user_model.IsErrUserAlreadyExist(err) ||
 			db.IsErrNameReserved(err) ||
 			db.IsErrNameCharsNotAllowed(err) ||
diff --git a/routers/api/v1/admin/repo.go b/routers/api/v1/admin/repo.go
index 467f8a22ffac..712ced89c99e 100644
--- a/routers/api/v1/admin/repo.go
+++ b/routers/api/v1/admin/repo.go
@@ -9,7 +9,6 @@ import (
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/repo"
-	"code.gitea.io/gitea/routers/api/v1/user"
 )
 
 // CreateRepo api for creating a repository
@@ -42,11 +41,8 @@ func CreateRepo(ctx *context.APIContext) {
 	//     "$ref": "#/responses/error"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
-	form := web.GetForm(ctx).(*api.CreateRepoOption)
-	owner := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
 
-	repo.CreateUserRepo(ctx, owner, *form)
+	form := web.GetForm(ctx).(*api.CreateRepoOption)
+
+	repo.CreateUserRepo(ctx, ctx.ContextUser, *form)
 }
diff --git a/routers/api/v1/admin/user.go b/routers/api/v1/admin/user.go
index 677950664d43..da44c23213c6 100644
--- a/routers/api/v1/admin/user.go
+++ b/routers/api/v1/admin/user.go
@@ -73,6 +73,7 @@ func CreateUser(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	form := web.GetForm(ctx).(*api.CreateUserOption)
 
 	u := &user_model.User{
@@ -163,13 +164,10 @@ func EditUser(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
-	form := web.GetForm(ctx).(*api.EditUserOption)
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
 
-	parseAuthSource(ctx, u, form.SourceID, form.LoginName)
+	form := web.GetForm(ctx).(*api.EditUserOption)
+
+	parseAuthSource(ctx, ctx.ContextUser, form.SourceID, form.LoginName)
 	if ctx.Written() {
 		return
 	}
@@ -193,24 +191,24 @@ func EditUser(ctx *context.APIContext) {
 			ctx.Error(http.StatusBadRequest, "PasswordPwned", errors.New("PasswordPwned"))
 			return
 		}
-		if u.Salt, err = user_model.GetUserSalt(); err != nil {
+		if ctx.ContextUser.Salt, err = user_model.GetUserSalt(); err != nil {
 			ctx.Error(http.StatusInternalServerError, "UpdateUser", err)
 			return
 		}
-		if err = u.SetPassword(form.Password); err != nil {
+		if err = ctx.ContextUser.SetPassword(form.Password); err != nil {
 			ctx.InternalServerError(err)
 			return
 		}
 	}
 
 	if form.MustChangePassword != nil {
-		u.MustChangePassword = *form.MustChangePassword
+		ctx.ContextUser.MustChangePassword = *form.MustChangePassword
 	}
 
-	u.LoginName = form.LoginName
+	ctx.ContextUser.LoginName = form.LoginName
 
 	if form.FullName != nil {
-		u.FullName = *form.FullName
+		ctx.ContextUser.FullName = *form.FullName
 	}
 	var emailChanged bool
 	if form.Email != nil {
@@ -225,47 +223,47 @@ func EditUser(ctx *context.APIContext) {
 			return
 		}
 
-		emailChanged = !strings.EqualFold(u.Email, email)
-		u.Email = email
+		emailChanged = !strings.EqualFold(ctx.ContextUser.Email, email)
+		ctx.ContextUser.Email = email
 	}
 	if form.Website != nil {
-		u.Website = *form.Website
+		ctx.ContextUser.Website = *form.Website
 	}
 	if form.Location != nil {
-		u.Location = *form.Location
+		ctx.ContextUser.Location = *form.Location
 	}
 	if form.Description != nil {
-		u.Description = *form.Description
+		ctx.ContextUser.Description = *form.Description
 	}
 	if form.Active != nil {
-		u.IsActive = *form.Active
+		ctx.ContextUser.IsActive = *form.Active
 	}
 	if len(form.Visibility) != 0 {
-		u.Visibility = api.VisibilityModes[form.Visibility]
+		ctx.ContextUser.Visibility = api.VisibilityModes[form.Visibility]
 	}
 	if form.Admin != nil {
-		u.IsAdmin = *form.Admin
+		ctx.ContextUser.IsAdmin = *form.Admin
 	}
 	if form.AllowGitHook != nil {
-		u.AllowGitHook = *form.AllowGitHook
+		ctx.ContextUser.AllowGitHook = *form.AllowGitHook
 	}
 	if form.AllowImportLocal != nil {
-		u.AllowImportLocal = *form.AllowImportLocal
+		ctx.ContextUser.AllowImportLocal = *form.AllowImportLocal
 	}
 	if form.MaxRepoCreation != nil {
-		u.MaxRepoCreation = *form.MaxRepoCreation
+		ctx.ContextUser.MaxRepoCreation = *form.MaxRepoCreation
 	}
 	if form.AllowCreateOrganization != nil {
-		u.AllowCreateOrganization = *form.AllowCreateOrganization
+		ctx.ContextUser.AllowCreateOrganization = *form.AllowCreateOrganization
 	}
 	if form.ProhibitLogin != nil {
-		u.ProhibitLogin = *form.ProhibitLogin
+		ctx.ContextUser.ProhibitLogin = *form.ProhibitLogin
 	}
 	if form.Restricted != nil {
-		u.IsRestricted = *form.Restricted
+		ctx.ContextUser.IsRestricted = *form.Restricted
 	}
 
-	if err := user_model.UpdateUser(u, emailChanged); err != nil {
+	if err := user_model.UpdateUser(ctx.ContextUser, emailChanged); err != nil {
 		if user_model.IsErrEmailAlreadyUsed(err) ||
 			user_model.IsErrEmailCharIsNotSupported(err) ||
 			user_model.IsErrEmailInvalid(err) {
@@ -275,9 +273,9 @@ func EditUser(ctx *context.APIContext) {
 		}
 		return
 	}
-	log.Trace("Account profile updated by admin (%s): %s", ctx.Doer.Name, u.Name)
+	log.Trace("Account profile updated by admin (%s): %s", ctx.Doer.Name, ctx.ContextUser.Name)
 
-	ctx.JSON(http.StatusOK, convert.ToUser(u, ctx.Doer))
+	ctx.JSON(http.StatusOK, convert.ToUser(ctx.ContextUser, ctx.Doer))
 }
 
 // DeleteUser api for deleting a user
@@ -301,17 +299,12 @@ func DeleteUser(ctx *context.APIContext) {
 	//   "422":
 	//     "$ref": "#/responses/validationError"
 
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
+	if ctx.ContextUser.IsOrganization() {
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Errorf("%s is an organization not a user", ctx.ContextUser.Name))
 		return
 	}
 
-	if u.IsOrganization() {
-		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Errorf("%s is an organization not a user", u.Name))
-		return
-	}
-
-	if err := user_service.DeleteUser(u); err != nil {
+	if err := user_service.DeleteUser(ctx.ContextUser); err != nil {
 		if models.IsErrUserOwnRepos(err) ||
 			models.IsErrUserHasOrgs(err) {
 			ctx.Error(http.StatusUnprocessableEntity, "", err)
@@ -320,7 +313,7 @@ func DeleteUser(ctx *context.APIContext) {
 		}
 		return
 	}
-	log.Trace("Account deleted by admin(%s): %s", ctx.Doer.Name, u.Name)
+	log.Trace("Account deleted by admin(%s): %s", ctx.Doer.Name, ctx.ContextUser.Name)
 
 	ctx.Status(http.StatusNoContent)
 }
@@ -351,12 +344,10 @@ func CreatePublicKey(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "422":
 	//     "$ref": "#/responses/validationError"
+
 	form := web.GetForm(ctx).(*api.CreateKeyOption)
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	user.CreateUserPublicKey(ctx, *form, u.ID)
+
+	user.CreateUserPublicKey(ctx, *form, ctx.ContextUser.ID)
 }
 
 // DeleteUserPublicKey api for deleting a user's public key
@@ -386,12 +377,7 @@ func DeleteUserPublicKey(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-
-	if err := asymkey_service.DeletePublicKey(u, ctx.ParamsInt64(":id")); err != nil {
+	if err := asymkey_service.DeletePublicKey(ctx.ContextUser, ctx.ParamsInt64(":id")); err != nil {
 		if asymkey_model.IsErrKeyNotExist(err) {
 			ctx.NotFound()
 		} else if asymkey_model.IsErrKeyAccessDenied(err) {
@@ -401,7 +387,7 @@ func DeleteUserPublicKey(ctx *context.APIContext) {
 		}
 		return
 	}
-	log.Trace("Key deleted by admin(%s): %s", ctx.Doer.Name, u.Name)
+	log.Trace("Key deleted by admin(%s): %s", ctx.Doer.Name, ctx.ContextUser.Name)
 
 	ctx.Status(http.StatusNoContent)
 }
diff --git a/routers/api/v1/api.go b/routers/api/v1/api.go
index 4b3016402674..5ac6fba29be4 100644
--- a/routers/api/v1/api.go
+++ b/routers/api/v1/api.go
@@ -87,6 +87,7 @@ import (
 	"code.gitea.io/gitea/routers/api/v1/settings"
 	"code.gitea.io/gitea/routers/api/v1/user"
 	"code.gitea.io/gitea/services/auth"
+	context_service "code.gitea.io/gitea/services/context"
 	"code.gitea.io/gitea/services/forms"
 
 	_ "code.gitea.io/gitea/routers/api/v1/swagger" // for swagger generation
@@ -156,6 +157,7 @@ func repoAssignment() func(ctx *context.APIContext) {
 			}
 		}
 		ctx.Repo.Owner = owner
+		ctx.ContextUser = owner
 
 		// Get repository.
 		repo, err := repo_model.GetRepositoryByName(owner.ID, repoName)
@@ -441,6 +443,7 @@ func orgAssignment(args ...bool) func(ctx *context.APIContext) {
 				}
 				return
 			}
+			ctx.ContextUser = ctx.Org.Organization.AsUser()
 		}
 
 		if assignTeam {
@@ -636,7 +639,7 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 						Post(bind(api.CreateAccessTokenOption{}), user.CreateAccessToken)
 					m.Combo("/{id}").Delete(user.DeleteAccessToken)
 				}, reqBasicOrRevProxyAuth())
-			})
+			}, context_service.UserAssignmentAPI())
 		})
 
 		m.Group("/users", func() {
@@ -653,7 +656,7 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 				m.Get("/starred", user.GetStarredRepos)
 
 				m.Get("/subscriptions", user.GetWatchedRepos)
-			})
+			}, context_service.UserAssignmentAPI())
 		}, reqToken())
 
 		m.Group("/user", func() {
@@ -669,7 +672,11 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 			m.Get("/followers", user.ListMyFollowers)
 			m.Group("/following", func() {
 				m.Get("", user.ListMyFollowing)
-				m.Combo("/{username}").Get(user.CheckMyFollowing).Put(user.Follow).Delete(user.Unfollow)
+				m.Group("/{username}", func() {
+					m.Get("", user.CheckMyFollowing)
+					m.Put("", user.Follow)
+					m.Delete("", user.Unfollow)
+				}, context_service.UserAssignmentAPI())
 			})
 
 			m.Group("/keys", func() {
@@ -1005,7 +1012,7 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 		m.Group("/users/{username}/orgs", func() {
 			m.Get("", org.ListUserOrgs)
 			m.Get("/{org}/permissions", reqToken(), org.GetUserOrgsPermissions)
-		})
+		}, context_service.UserAssignmentAPI())
 		m.Post("/orgs", reqToken(), bind(api.CreateOrgOption{}), org.Create)
 		m.Get("/orgs", org.GetAll)
 		m.Group("/orgs/{org}", func() {
@@ -1083,7 +1090,7 @@ func Routes(sessioner func(http.Handler) http.Handler) *web.Route {
 					m.Get("/orgs", org.ListUserOrgs)
 					m.Post("/orgs", bind(api.CreateOrgOption{}), admin.CreateOrg)
 					m.Post("/repos", bind(api.CreateRepoOption{}), admin.CreateRepo)
-				})
+				}, context_service.UserAssignmentAPI())
 			})
 			m.Group("/unadopted", func() {
 				m.Get("", admin.ListUnadoptedRepositories)
diff --git a/routers/api/v1/org/org.go b/routers/api/v1/org/org.go
index 63cc0e9d39a6..fcc98f4b7825 100644
--- a/routers/api/v1/org/org.go
+++ b/routers/api/v1/org/org.go
@@ -99,11 +99,7 @@ func ListUserOrgs(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/OrganizationList"
 
-	u := user.GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	listUserOrgs(ctx, u)
+	listUserOrgs(ctx, ctx.ContextUser)
 }
 
 // GetUserOrgsPermissions get user permissions in organization
@@ -132,11 +128,6 @@ func GetUserOrgsPermissions(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	var u *user_model.User
-	if u = user.GetUserByParams(ctx); u == nil {
-		return
-	}
-
 	var o *user_model.User
 	if o = user.GetUserByParamsName(ctx, ":org"); o == nil {
 		return
@@ -144,13 +135,13 @@ func GetUserOrgsPermissions(ctx *context.APIContext) {
 
 	op := api.OrganizationPermissions{}
 
-	if !models.HasOrgOrUserVisible(o, u) {
+	if !models.HasOrgOrUserVisible(o, ctx.ContextUser) {
 		ctx.NotFound("HasOrgOrUserVisible", nil)
 		return
 	}
 
 	org := models.OrgFromUser(o)
-	authorizeLevel, err := org.GetOrgUserMaxAuthorizeLevel(u.ID)
+	authorizeLevel, err := org.GetOrgUserMaxAuthorizeLevel(ctx.ContextUser.ID)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetOrgUserAuthorizeLevel", err)
 		return
@@ -169,7 +160,7 @@ func GetUserOrgsPermissions(ctx *context.APIContext) {
 		op.IsOwner = true
 	}
 
-	op.CanCreateRepository, err = org.CanCreateOrgRepo(u.ID)
+	op.CanCreateRepository, err = org.CanCreateOrgRepo(ctx.ContextUser.ID)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "CanCreateOrgRepo", err)
 		return
diff --git a/routers/api/v1/user/follower.go b/routers/api/v1/user/follower.go
index 063f68519c60..3c81b27f8dad 100644
--- a/routers/api/v1/user/follower.go
+++ b/routers/api/v1/user/follower.go
@@ -82,11 +82,7 @@ func ListFollowers(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/UserList"
 
-	u := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	listUserFollowers(ctx, u)
+	listUserFollowers(ctx, ctx.ContextUser)
 }
 
 func listUserFollowing(ctx *context.APIContext, u *user_model.User) {
@@ -148,11 +144,7 @@ func ListFollowing(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/UserList"
 
-	u := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	listUserFollowing(ctx, u)
+	listUserFollowing(ctx, ctx.ContextUser)
 }
 
 func checkUserFollowing(ctx *context.APIContext, u *user_model.User, followID int64) {
@@ -180,25 +172,21 @@ func CheckMyFollowing(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	target := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	checkUserFollowing(ctx, ctx.Doer, target.ID)
+	checkUserFollowing(ctx, ctx.Doer, ctx.ContextUser.ID)
 }
 
 // CheckFollowing check if one user is following another user
 func CheckFollowing(ctx *context.APIContext) {
-	// swagger:operation GET /users/{follower}/following/{followee} user userCheckFollowing
+	// swagger:operation GET /users/{username}/following/{target} user userCheckFollowing
 	// ---
 	// summary: Check if one user is following another user
 	// parameters:
-	// - name: follower
+	// - name: username
 	//   in: path
 	//   description: username of following user
 	//   type: string
 	//   required: true
-	// - name: followee
+	// - name: target
 	//   in: path
 	//   description: username of followed user
 	//   type: string
@@ -209,15 +197,11 @@ func CheckFollowing(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	u := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
 	target := GetUserByParamsName(ctx, ":target")
 	if ctx.Written() {
 		return
 	}
-	checkUserFollowing(ctx, u, target.ID)
+	checkUserFollowing(ctx, ctx.ContextUser, target.ID)
 }
 
 // Follow follow a user
@@ -235,11 +219,7 @@ func Follow(ctx *context.APIContext) {
 	//   "204":
 	//     "$ref": "#/responses/empty"
 
-	target := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	if err := user_model.FollowUser(ctx.Doer.ID, target.ID); err != nil {
+	if err := user_model.FollowUser(ctx.Doer.ID, ctx.ContextUser.ID); err != nil {
 		ctx.Error(http.StatusInternalServerError, "FollowUser", err)
 		return
 	}
@@ -261,11 +241,7 @@ func Unfollow(ctx *context.APIContext) {
 	//   "204":
 	//     "$ref": "#/responses/empty"
 
-	target := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	if err := user_model.UnfollowUser(ctx.Doer.ID, target.ID); err != nil {
+	if err := user_model.UnfollowUser(ctx.Doer.ID, ctx.ContextUser.ID); err != nil {
 		ctx.Error(http.StatusInternalServerError, "UnfollowUser", err)
 		return
 	}
diff --git a/routers/api/v1/user/gpg_key.go b/routers/api/v1/user/gpg_key.go
index 83122355d017..b211a24a0e0d 100644
--- a/routers/api/v1/user/gpg_key.go
+++ b/routers/api/v1/user/gpg_key.go
@@ -64,11 +64,7 @@ func ListGPGKeys(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/GPGKeyList"
 
-	user := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	listGPGKeys(ctx, user.ID, utils.GetListOptions(ctx))
+	listGPGKeys(ctx, ctx.ContextUser.ID, utils.GetListOptions(ctx))
 }
 
 // ListMyGPGKeys get the GPG key list of the authenticated user
diff --git a/routers/api/v1/user/key.go b/routers/api/v1/user/key.go
index 67ffec723d8a..cc7ee739ce3a 100644
--- a/routers/api/v1/user/key.go
+++ b/routers/api/v1/user/key.go
@@ -151,11 +151,7 @@ func ListPublicKeys(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/PublicKeyList"
 
-	user := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-	listPublicKeys(ctx, user)
+	listPublicKeys(ctx, ctx.ContextUser)
 }
 
 // GetPublicKey get a public key
diff --git a/routers/api/v1/user/repo.go b/routers/api/v1/user/repo.go
index 683c300953f5..0231c8ccbcb9 100644
--- a/routers/api/v1/user/repo.go
+++ b/routers/api/v1/user/repo.go
@@ -78,12 +78,8 @@ func ListUserRepos(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
 
-	user := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
 	private := ctx.IsSigned
-	listUserRepos(ctx, user, private)
+	listUserRepos(ctx, ctx.ContextUser, private)
 }
 
 // ListMyRepos - list the repositories you own or have access to.
diff --git a/routers/api/v1/user/star.go b/routers/api/v1/user/star.go
index 95d3785a82ef..83f97f8f0192 100644
--- a/routers/api/v1/user/star.go
+++ b/routers/api/v1/user/star.go
@@ -62,15 +62,14 @@ func GetStarredRepos(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
 
-	user := GetUserByParams(ctx)
-	private := user.ID == ctx.Doer.ID
-	repos, err := getStarredRepos(user, private, utils.GetListOptions(ctx))
+	private := ctx.ContextUser.ID == ctx.Doer.ID
+	repos, err := getStarredRepos(ctx.ContextUser, private, utils.GetListOptions(ctx))
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "getStarredRepos", err)
 		return
 	}
 
-	ctx.SetTotalCountHeader(int64(user.NumStars))
+	ctx.SetTotalCountHeader(int64(ctx.ContextUser.NumStars))
 	ctx.JSON(http.StatusOK, &repos)
 }
 
diff --git a/routers/api/v1/user/user.go b/routers/api/v1/user/user.go
index 56e6ad887919..e9d871c5c1d5 100644
--- a/routers/api/v1/user/user.go
+++ b/routers/api/v1/user/user.go
@@ -98,18 +98,12 @@ func GetInfo(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	u := GetUserByParams(ctx)
-
-	if ctx.Written() {
-		return
-	}
-
-	if !models.IsUserVisibleToViewer(u, ctx.Doer) {
+	if !models.IsUserVisibleToViewer(ctx.ContextUser, ctx.Doer) {
 		// fake ErrUserNotExist error message to not leak information about existence
 		ctx.NotFound("GetUserByName", user_model.ErrUserNotExist{Name: ctx.Params(":username")})
 		return
 	}
-	ctx.JSON(http.StatusOK, convert.ToUser(u, ctx.Doer))
+	ctx.JSON(http.StatusOK, convert.ToUser(ctx.ContextUser, ctx.Doer))
 }
 
 // GetAuthenticatedUser get current user's information
@@ -145,12 +139,7 @@ func GetUserHeatmapData(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	user := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-
-	heatmap, err := models.GetUserHeatmapDataByUser(user, ctx.Doer)
+	heatmap, err := models.GetUserHeatmapDataByUser(ctx.ContextUser, ctx.Doer)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetUserHeatmapDataByUser", err)
 		return
diff --git a/routers/api/v1/user/watch.go b/routers/api/v1/user/watch.go
index 718a9282ed91..22e76f5ebc0b 100644
--- a/routers/api/v1/user/watch.go
+++ b/routers/api/v1/user/watch.go
@@ -60,9 +60,8 @@ func GetWatchedRepos(ctx *context.APIContext) {
 	//   "200":
 	//     "$ref": "#/responses/RepositoryList"
 
-	user := GetUserByParams(ctx)
-	private := user.ID == ctx.Doer.ID
-	repos, total, err := getWatchedRepos(user, private, utils.GetListOptions(ctx))
+	private := ctx.ContextUser.ID == ctx.Doer.ID
+	repos, total, err := getWatchedRepos(ctx.ContextUser, private, utils.GetListOptions(ctx))
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "getWatchedRepos", err)
 	}
diff --git a/routers/web/feed/profile.go b/routers/web/feed/profile.go
index 32898c6ee74e..61a39755f502 100644
--- a/routers/web/feed/profile.go
+++ b/routers/web/feed/profile.go
@@ -9,19 +9,28 @@ import (
 	"time"
 
 	"code.gitea.io/gitea/models"
-	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/context"
 
 	"github.com/gorilla/feeds"
 )
 
-// ShowUserFeed show user activity as RSS / Atom feed
-func ShowUserFeed(ctx *context.Context, ctxUser *user_model.User, formatType string) {
+// ShowUserFeedRSS show user activity as RSS feed
+func ShowUserFeedRSS(ctx *context.Context) {
+	showUserFeed(ctx, "rss")
+}
+
+// ShowUserFeedAtom show user activity as Atom feed
+func ShowUserFeedAtom(ctx *context.Context) {
+	showUserFeed(ctx, "atom")
+}
+
+// showUserFeed show user activity as RSS / Atom feed
+func showUserFeed(ctx *context.Context, formatType string) {
 	actions, err := models.GetFeeds(ctx, models.GetFeedsOptions{
-		RequestedUser:   ctxUser,
+		RequestedUser:   ctx.ContextUser,
 		Actor:           ctx.Doer,
 		IncludePrivate:  false,
-		OnlyPerformedBy: !ctxUser.IsOrganization(),
+		OnlyPerformedBy: !ctx.ContextUser.IsOrganization(),
 		IncludeDeleted:  false,
 		Date:            ctx.FormString("date"),
 	})
@@ -31,9 +40,9 @@ func ShowUserFeed(ctx *context.Context, ctxUser *user_model.User, formatType str
 	}
 
 	feed := &feeds.Feed{
-		Title:       ctx.Tr("home.feed_of", ctxUser.DisplayName()),
-		Link:        &feeds.Link{Href: ctxUser.HTMLURL()},
-		Description: ctxUser.Description,
+		Title:       ctx.Tr("home.feed_of", ctx.ContextUser.DisplayName()),
+		Link:        &feeds.Link{Href: ctx.ContextUser.HTMLURL()},
+		Description: ctx.ContextUser.Description,
 		Created:     time.Now(),
 	}
 
diff --git a/routers/web/repo/http.go b/routers/web/repo/http.go
index 0207cd7685e5..d149d4f89fa5 100644
--- a/routers/web/repo/http.go
+++ b/routers/web/repo/http.go
@@ -24,7 +24,6 @@ import (
 	"code.gitea.io/gitea/models/perm"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
-	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
@@ -110,19 +109,7 @@ func httpBase(ctx *context.Context) (h *serviceHandler) {
 		reponame = reponame[:len(reponame)-5]
 	}
 
-	owner, err := user_model.GetUserByName(username)
-	if err != nil {
-		if user_model.IsErrUserNotExist(err) {
-			if redirectUserID, err := user_model.LookupUserRedirect(username); err == nil {
-				context.RedirectToUser(ctx, username, redirectUserID)
-			} else {
-				ctx.NotFound(fmt.Sprintf("User %s does not exist", username), nil)
-			}
-		} else {
-			ctx.ServerError("GetUserByName", err)
-		}
-		return
-	}
+	owner := ctx.ContextUser
 	if !owner.IsOrganization() && !owner.IsActive {
 		ctx.PlainText(http.StatusForbidden, "Repository cannot be accessed. You cannot push or open issues/pull-requests.")
 		return
diff --git a/routers/web/user/home.go b/routers/web/user/home.go
index d3810f887d23..e0beb0cbee00 100644
--- a/routers/web/user/home.go
+++ b/routers/web/user/home.go
@@ -756,8 +756,8 @@ func loadRepoByIDs(ctxUser *user_model.User, issueCountByRepo map[int64]int64, u
 }
 
 // ShowSSHKeys output all the ssh keys of user by uid
-func ShowSSHKeys(ctx *context.Context, uid int64) {
-	keys, err := asymkey_model.ListPublicKeys(uid, db.ListOptions{})
+func ShowSSHKeys(ctx *context.Context) {
+	keys, err := asymkey_model.ListPublicKeys(ctx.ContextUser.ID, db.ListOptions{})
 	if err != nil {
 		ctx.ServerError("ListPublicKeys", err)
 		return
@@ -772,8 +772,8 @@ func ShowSSHKeys(ctx *context.Context, uid int64) {
 }
 
 // ShowGPGKeys output all the public GPG keys of user by uid
-func ShowGPGKeys(ctx *context.Context, uid int64) {
-	keys, err := asymkey_model.ListGPGKeys(ctx, uid, db.ListOptions{})
+func ShowGPGKeys(ctx *context.Context) {
+	keys, err := asymkey_model.ListGPGKeys(ctx, ctx.ContextUser.ID, db.ListOptions{})
 	if err != nil {
 		ctx.ServerError("ListGPGKeys", err)
 		return
diff --git a/routers/web/user/profile.go b/routers/web/user/profile.go
index ca8011a6cfde..db2660af6172 100644
--- a/routers/web/user/profile.go
+++ b/routers/web/user/profile.go
@@ -8,7 +8,6 @@ package user
 import (
 	"fmt"
 	"net/http"
-	"path"
 	"strings"
 
 	"code.gitea.io/gitea/models"
@@ -24,121 +23,51 @@ import (
 	"code.gitea.io/gitea/routers/web/org"
 )
 
-// GetUserByName get user by name
-func GetUserByName(ctx *context.Context, name string) *user_model.User {
-	user, err := user_model.GetUserByName(name)
-	if err != nil {
-		if user_model.IsErrUserNotExist(err) {
-			if redirectUserID, err := user_model.LookupUserRedirect(name); err == nil {
-				context.RedirectToUser(ctx, name, redirectUserID)
-			} else {
-				ctx.NotFound("GetUserByName", err)
-			}
-		} else {
-			ctx.ServerError("GetUserByName", err)
-		}
-		return nil
-	}
-	return user
-}
-
-// GetUserByParams returns user whose name is presented in URL paramenter.
-func GetUserByParams(ctx *context.Context) *user_model.User {
-	return GetUserByName(ctx, ctx.Params(":username"))
-}
-
 // Profile render user's profile page
 func Profile(ctx *context.Context) {
-	uname := ctx.Params(":username")
-
-	// Special handle for FireFox requests favicon.ico.
-	if uname == "favicon.ico" {
-		ctx.ServeFile(path.Join(setting.StaticRootPath, "public/img/favicon.png"))
+	if strings.Contains(ctx.Req.Header.Get("Accept"), "application/rss+xml") {
+		feed.ShowUserFeedRSS(ctx)
+		return
+	}
+	if strings.Contains(ctx.Req.Header.Get("Accept"), "application/atom+xml") {
+		feed.ShowUserFeedAtom(ctx)
 		return
 	}
 
-	if strings.HasSuffix(uname, ".png") {
-		ctx.Error(http.StatusNotFound)
-		return
-	}
-
-	isShowKeys := false
-	if strings.HasSuffix(uname, ".keys") {
-		isShowKeys = true
-		uname = strings.TrimSuffix(uname, ".keys")
-	}
-
-	isShowGPG := false
-	if strings.HasSuffix(uname, ".gpg") {
-		isShowGPG = true
-		uname = strings.TrimSuffix(uname, ".gpg")
-	}
-
-	isShowFeed, uname, showFeedType := feed.GetFeedType(uname, ctx.Req)
-
-	ctxUser := GetUserByName(ctx, uname)
-	if ctx.Written() {
-		return
-	}
-
-	if ctxUser.IsOrganization() {
-		// Show Org RSS feed
-		if isShowFeed {
-			feed.ShowUserFeed(ctx, ctxUser, showFeedType)
-			return
-		}
-
+	if ctx.ContextUser.IsOrganization() {
 		org.Home(ctx)
 		return
 	}
 
 	// check view permissions
-	if !models.IsUserVisibleToViewer(ctxUser, ctx.Doer) {
-		ctx.NotFound("user", fmt.Errorf(uname))
-		return
-	}
-
-	// Show SSH keys.
-	if isShowKeys {
-		ShowSSHKeys(ctx, ctxUser.ID)
-		return
-	}
-
-	// Show GPG keys.
-	if isShowGPG {
-		ShowGPGKeys(ctx, ctxUser.ID)
-		return
-	}
-
-	// Show User RSS feed
-	if isShowFeed {
-		feed.ShowUserFeed(ctx, ctxUser, showFeedType)
+	if !models.IsUserVisibleToViewer(ctx.ContextUser, ctx.Doer) {
+		ctx.NotFound("user", fmt.Errorf(ctx.ContextUser.Name))
 		return
 	}
 
 	// advertise feed via meta tag
-	ctx.Data["FeedURL"] = ctxUser.HTMLURL()
+	ctx.Data["FeedURL"] = ctx.ContextUser.HTMLURL()
 
 	// Show OpenID URIs
-	openIDs, err := user_model.GetUserOpenIDs(ctxUser.ID)
+	openIDs, err := user_model.GetUserOpenIDs(ctx.ContextUser.ID)
 	if err != nil {
 		ctx.ServerError("GetUserOpenIDs", err)
 		return
 	}
 
 	var isFollowing bool
-	if ctx.Doer != nil && ctxUser != nil {
-		isFollowing = user_model.IsFollowing(ctx.Doer.ID, ctxUser.ID)
+	if ctx.Doer != nil {
+		isFollowing = user_model.IsFollowing(ctx.Doer.ID, ctx.ContextUser.ID)
 	}
 
-	ctx.Data["Title"] = ctxUser.DisplayName()
+	ctx.Data["Title"] = ctx.ContextUser.DisplayName()
 	ctx.Data["PageIsUserProfile"] = true
-	ctx.Data["Owner"] = ctxUser
+	ctx.Data["Owner"] = ctx.ContextUser
 	ctx.Data["OpenIDs"] = openIDs
 	ctx.Data["IsFollowing"] = isFollowing
 
 	if setting.Service.EnableUserHeatmap {
-		data, err := models.GetUserHeatmapDataByUser(ctxUser, ctx.Doer)
+		data, err := models.GetUserHeatmapDataByUser(ctx.ContextUser, ctx.Doer)
 		if err != nil {
 			ctx.ServerError("GetUserHeatmapDataByUser", err)
 			return
@@ -146,13 +75,13 @@ func Profile(ctx *context.Context) {
 		ctx.Data["HeatmapData"] = data
 	}
 
-	if len(ctxUser.Description) != 0 {
+	if len(ctx.ContextUser.Description) != 0 {
 		content, err := markdown.RenderString(&markup.RenderContext{
 			URLPrefix: ctx.Repo.RepoLink,
 			Metas:     map[string]string{"mode": "document"},
 			GitRepo:   ctx.Repo.GitRepo,
 			Ctx:       ctx,
-		}, ctxUser.Description)
+		}, ctx.ContextUser.Description)
 		if err != nil {
 			ctx.ServerError("RenderString", err)
 			return
@@ -160,10 +89,10 @@ func Profile(ctx *context.Context) {
 		ctx.Data["RenderedDescription"] = content
 	}
 
-	showPrivate := ctx.IsSigned && (ctx.Doer.IsAdmin || ctx.Doer.ID == ctxUser.ID)
+	showPrivate := ctx.IsSigned && (ctx.Doer.IsAdmin || ctx.Doer.ID == ctx.ContextUser.ID)
 
 	orgs, err := models.FindOrgs(models.FindOrgOptions{
-		UserID:         ctxUser.ID,
+		UserID:         ctx.ContextUser.ID,
 		IncludePrivate: showPrivate,
 	})
 	if err != nil {
@@ -226,7 +155,7 @@ func Profile(ctx *context.Context) {
 
 	switch tab {
 	case "followers":
-		items, err := user_model.GetUserFollowers(ctxUser, db.ListOptions{
+		items, err := user_model.GetUserFollowers(ctx.ContextUser, db.ListOptions{
 			PageSize: setting.UI.User.RepoPagingNum,
 			Page:     page,
 		})
@@ -236,9 +165,9 @@ func Profile(ctx *context.Context) {
 		}
 		ctx.Data["Cards"] = items
 
-		total = ctxUser.NumFollowers
+		total = ctx.ContextUser.NumFollowers
 	case "following":
-		items, err := user_model.GetUserFollowing(ctxUser, db.ListOptions{
+		items, err := user_model.GetUserFollowing(ctx.ContextUser, db.ListOptions{
 			PageSize: setting.UI.User.RepoPagingNum,
 			Page:     page,
 		})
@@ -248,10 +177,10 @@ func Profile(ctx *context.Context) {
 		}
 		ctx.Data["Cards"] = items
 
-		total = ctxUser.NumFollowing
+		total = ctx.ContextUser.NumFollowing
 	case "activity":
 		ctx.Data["Feeds"], err = models.GetFeeds(ctx, models.GetFeedsOptions{
-			RequestedUser:   ctxUser,
+			RequestedUser:   ctx.ContextUser,
 			Actor:           ctx.Doer,
 			IncludePrivate:  showPrivate,
 			OnlyPerformedBy: true,
@@ -273,7 +202,7 @@ func Profile(ctx *context.Context) {
 			Keyword:            keyword,
 			OrderBy:            orderBy,
 			Private:            ctx.IsSigned,
-			StarredByID:        ctxUser.ID,
+			StarredByID:        ctx.ContextUser.ID,
 			Collaborate:        util.OptionalBoolFalse,
 			TopicOnly:          topicOnly,
 			Language:           language,
@@ -305,7 +234,7 @@ func Profile(ctx *context.Context) {
 			Keyword:            keyword,
 			OrderBy:            orderBy,
 			Private:            ctx.IsSigned,
-			WatchedByID:        ctxUser.ID,
+			WatchedByID:        ctx.ContextUser.ID,
 			Collaborate:        util.OptionalBoolFalse,
 			TopicOnly:          topicOnly,
 			Language:           language,
@@ -325,7 +254,7 @@ func Profile(ctx *context.Context) {
 			},
 			Actor:              ctx.Doer,
 			Keyword:            keyword,
-			OwnerID:            ctxUser.ID,
+			OwnerID:            ctx.ContextUser.ID,
 			OrderBy:            orderBy,
 			Private:            ctx.IsSigned,
 			Collaborate:        util.OptionalBoolFalse,
@@ -350,24 +279,19 @@ func Profile(ctx *context.Context) {
 	}
 	ctx.Data["Page"] = pager
 
-	ctx.Data["ShowUserEmail"] = len(ctxUser.Email) > 0 && ctx.IsSigned && (!ctxUser.KeepEmailPrivate || ctxUser.ID == ctx.Doer.ID)
+	ctx.Data["ShowUserEmail"] = len(ctx.ContextUser.Email) > 0 && ctx.IsSigned && (!ctx.ContextUser.KeepEmailPrivate || ctx.ContextUser.ID == ctx.Doer.ID)
 
 	ctx.HTML(http.StatusOK, tplProfile)
 }
 
 // Action response for follow/unfollow user request
 func Action(ctx *context.Context) {
-	u := GetUserByParams(ctx)
-	if ctx.Written() {
-		return
-	}
-
 	var err error
 	switch ctx.FormString("action") {
 	case "follow":
-		err = user_model.FollowUser(ctx.Doer.ID, u.ID)
+		err = user_model.FollowUser(ctx.Doer.ID, ctx.ContextUser.ID)
 	case "unfollow":
-		err = user_model.UnfollowUser(ctx.Doer.ID, u.ID)
+		err = user_model.UnfollowUser(ctx.Doer.ID, ctx.ContextUser.ID)
 	}
 
 	if err != nil {
@@ -375,5 +299,5 @@ func Action(ctx *context.Context) {
 		return
 	}
 	// FIXME: We should check this URL and make sure that it's a valid Gitea URL
-	ctx.RedirectToFirst(ctx.FormString("redirect_to"), u.HomeLink())
+	ctx.RedirectToFirst(ctx.FormString("redirect_to"), ctx.ContextUser.HomeLink())
 }
diff --git a/routers/web/web.go b/routers/web/web.go
index b40a43058d42..f4cabaab6e74 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -29,12 +29,14 @@ import (
 	"code.gitea.io/gitea/routers/web/dev"
 	"code.gitea.io/gitea/routers/web/events"
 	"code.gitea.io/gitea/routers/web/explore"
+	"code.gitea.io/gitea/routers/web/feed"
 	"code.gitea.io/gitea/routers/web/org"
 	"code.gitea.io/gitea/routers/web/repo"
 	"code.gitea.io/gitea/routers/web/user"
 	user_setting "code.gitea.io/gitea/routers/web/user/setting"
 	"code.gitea.io/gitea/routers/web/user/setting/security"
 	auth_service "code.gitea.io/gitea/services/auth"
+	context_service "code.gitea.io/gitea/services/context"
 	"code.gitea.io/gitea/services/forms"
 	"code.gitea.io/gitea/services/lfs"
 	"code.gitea.io/gitea/services/mailer"
@@ -496,11 +498,21 @@ func RegisterRoutes(m *web.Route) {
 	// ***** END: Admin *****
 
 	m.Group("", func() {
-		m.Get("/{username}", user.Profile)
+		m.Get("/favicon.ico", func(ctx *context.Context) {
+			ctx.ServeFile(path.Join(setting.StaticRootPath, "public/img/favicon.png"))
+		})
+		m.Group("/{username}", func() {
+			m.Get(".png", func(ctx *context.Context) { ctx.Error(http.StatusNotFound) })
+			m.Get(".keys", user.ShowSSHKeys)
+			m.Get(".gpg", user.ShowGPGKeys)
+			m.Get(".rss", feed.ShowUserFeedRSS)
+			m.Get(".atom", feed.ShowUserFeedAtom)
+			m.Get("", user.Profile)
+		}, context_service.UserAssignmentWeb())
 		m.Get("/attachments/{uuid}", repo.GetAttachment)
 	}, ignSignIn)
 
-	m.Post("/{username}", reqSignIn, user.Action)
+	m.Post("/{username}", reqSignIn, context_service.UserAssignmentWeb(), user.Action)
 
 	if !setting.IsProd {
 		m.Get("/template/*", dev.TemplatePreview)
@@ -1107,7 +1119,7 @@ func RegisterRoutes(m *web.Route) {
 				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)
+			}, ignSignInAndCsrf, context_service.UserAssignmentWeb())
 		})
 	})
 	// ***** END: Repository *****
diff --git a/services/context/user.go b/services/context/user.go
new file mode 100644
index 000000000000..c5efd43782ae
--- /dev/null
+++ b/services/context/user.go
@@ -0,0 +1,62 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/context"
+)
+
+// UserAssignmentWeb returns a middleware to handle context-user assignment for web routes
+func UserAssignmentWeb() func(ctx *context.Context) {
+	return func(ctx *context.Context) {
+		userAssignment(ctx, func(status int, title string, obj interface{}) {
+			err, ok := obj.(error)
+			if !ok {
+				err = fmt.Errorf("%s", obj)
+			}
+			if status == http.StatusNotFound {
+				ctx.NotFound(title, err)
+			} else {
+				ctx.ServerError(title, err)
+			}
+		})
+	}
+}
+
+// UserAssignmentAPI returns a middleware to handle context-user assignment for api routes
+func UserAssignmentAPI() func(ctx *context.APIContext) {
+	return func(ctx *context.APIContext) {
+		userAssignment(ctx.Context, ctx.Error)
+	}
+}
+
+func userAssignment(ctx *context.Context, errCb func(int, string, interface{})) {
+	username := ctx.Params(":username")
+
+	if ctx.IsSigned && ctx.Doer.LowerName == strings.ToLower(username) {
+		ctx.ContextUser = ctx.Doer
+	} else {
+		var err error
+		ctx.ContextUser, err = user_model.GetUserByName(username)
+		if err != nil {
+			if user_model.IsErrUserNotExist(err) {
+				if redirectUserID, err := user_model.LookupUserRedirect(username); err == nil {
+					context.RedirectToUser(ctx, username, redirectUserID)
+				} else if user_model.IsErrUserRedirectNotExist(err) {
+					errCb(http.StatusNotFound, "GetUserByName", err)
+				} else {
+					errCb(http.StatusInternalServerError, "LookupUserRedirect", err)
+				}
+			} else {
+				errCb(http.StatusInternalServerError, "GetUserByName", err)
+			}
+		}
+	}
+}
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 4f2e7dbb1a24..1aec9ec06f0a 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -12087,39 +12087,6 @@
         }
       }
     },
-    "/users/{follower}/following/{followee}": {
-      "get": {
-        "tags": [
-          "user"
-        ],
-        "summary": "Check if one user is following another user",
-        "operationId": "userCheckFollowing",
-        "parameters": [
-          {
-            "type": "string",
-            "description": "username of following user",
-            "name": "follower",
-            "in": "path",
-            "required": true
-          },
-          {
-            "type": "string",
-            "description": "username of followed user",
-            "name": "followee",
-            "in": "path",
-            "required": true
-          }
-        ],
-        "responses": {
-          "204": {
-            "$ref": "#/responses/empty"
-          },
-          "404": {
-            "$ref": "#/responses/notFound"
-          }
-        }
-      }
-    },
     "/users/{username}": {
       "get": {
         "produces": [
@@ -12225,6 +12192,39 @@
         }
       }
     },
+    "/users/{username}/following/{target}": {
+      "get": {
+        "tags": [
+          "user"
+        ],
+        "summary": "Check if one user is following another user",
+        "operationId": "userCheckFollowing",
+        "parameters": [
+          {
+            "type": "string",
+            "description": "username of following user",
+            "name": "username",
+            "in": "path",
+            "required": true
+          },
+          {
+            "type": "string",
+            "description": "username of followed user",
+            "name": "target",
+            "in": "path",
+            "required": true
+          }
+        ],
+        "responses": {
+          "204": {
+            "$ref": "#/responses/empty"
+          },
+          "404": {
+            "$ref": "#/responses/notFound"
+          }
+        }
+      }
+    },
     "/users/{username}/gpg_keys": {
       "get": {
         "produces": [