Move code from module to service (#24287)

The code should not be in `modules/` but `services/`.

Reference:
https://github.com/go-gitea/gitea/pull/24257#discussion_r1174578230

services/auth/middleware.go

@@ -5,9 +5,12 @@ package auth
 
 import (
 	"net/http"
+	"strings"
 
+	"code.gitea.io/gitea/models/auth"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/web/middleware"
 )
 
@@ -58,3 +61,182 @@ func authShared(ctx *context.Context, authMethod Method) error {
 	}
 	return nil
 }
+
+// VerifyOptions contains required or check options
+type VerifyOptions struct {
+	SignInRequired  bool
+	SignOutRequired bool
+	AdminRequired   bool
+	DisableCSRF     bool
+}
+
+// Checks authentication according to options
+func VerifyAuthWithOptions(options *VerifyOptions) func(ctx *context.Context) {
+	return func(ctx *context.Context) {
+		// Check prohibit login users.
+		if ctx.IsSigned {
+			if !ctx.Doer.IsActive && setting.Service.RegisterEmailConfirm {
+				ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
+				ctx.HTML(http.StatusOK, "user/auth/activate")
+				return
+			}
+			if !ctx.Doer.IsActive || ctx.Doer.ProhibitLogin {
+				log.Info("Failed authentication attempt for %s from %s", ctx.Doer.Name, ctx.RemoteAddr())
+				ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
+				ctx.HTML(http.StatusOK, "user/auth/prohibit_login")
+				return
+			}
+
+			if ctx.Doer.MustChangePassword {
+				if ctx.Req.URL.Path != "/user/settings/change_password" {
+					if strings.HasPrefix(ctx.Req.UserAgent(), "git") {
+						ctx.Error(http.StatusUnauthorized, ctx.Tr("auth.must_change_password"))
+						return
+					}
+					ctx.Data["Title"] = ctx.Tr("auth.must_change_password")
+					ctx.Data["ChangePasscodeLink"] = setting.AppSubURL + "/user/change_password"
+					if ctx.Req.URL.Path != "/user/events" {
+						middleware.SetRedirectToCookie(ctx.Resp, setting.AppSubURL+ctx.Req.URL.RequestURI())
+					}
+					ctx.Redirect(setting.AppSubURL + "/user/settings/change_password")
+					return
+				}
+			} else if ctx.Req.URL.Path == "/user/settings/change_password" {
+				// make sure that the form cannot be accessed by users who don't need this
+				ctx.Redirect(setting.AppSubURL + "/")
+				return
+			}
+		}
+
+		// Redirect to dashboard if user tries to visit any non-login page.
+		if options.SignOutRequired && ctx.IsSigned && ctx.Req.URL.RequestURI() != "/" {
+			ctx.Redirect(setting.AppSubURL + "/")
+			return
+		}
+
+		if !options.SignOutRequired && !options.DisableCSRF && ctx.Req.Method == "POST" {
+			ctx.Csrf.Validate(ctx)
+			if ctx.Written() {
+				return
+			}
+		}
+
+		if options.SignInRequired {
+			if !ctx.IsSigned {
+				if ctx.Req.URL.Path != "/user/events" {
+					middleware.SetRedirectToCookie(ctx.Resp, setting.AppSubURL+ctx.Req.URL.RequestURI())
+				}
+				ctx.Redirect(setting.AppSubURL + "/user/login")
+				return
+			} else if !ctx.Doer.IsActive && setting.Service.RegisterEmailConfirm {
+				ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
+				ctx.HTML(http.StatusOK, "user/auth/activate")
+				return
+			}
+		}
+
+		// Redirect to log in page if auto-signin info is provided and has not signed in.
+		if !options.SignOutRequired && !ctx.IsSigned &&
+			len(ctx.GetSiteCookie(setting.CookieUserName)) > 0 {
+			if ctx.Req.URL.Path != "/user/events" {
+				middleware.SetRedirectToCookie(ctx.Resp, setting.AppSubURL+ctx.Req.URL.RequestURI())
+			}
+			ctx.Redirect(setting.AppSubURL + "/user/login")
+			return
+		}
+
+		if options.AdminRequired {
+			if !ctx.Doer.IsAdmin {
+				ctx.Error(http.StatusForbidden)
+				return
+			}
+			ctx.Data["PageIsAdmin"] = true
+		}
+	}
+}
+
+// Checks authentication according to options
+func VerifyAuthWithOptionsAPI(options *VerifyOptions) func(ctx *context.APIContext) {
+	return func(ctx *context.APIContext) {
+		// Check prohibit login users.
+		if ctx.IsSigned {
+			if !ctx.Doer.IsActive && setting.Service.RegisterEmailConfirm {
+				ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
+				ctx.JSON(http.StatusForbidden, map[string]string{
+					"message": "This account is not activated.",
+				})
+				return
+			}
+			if !ctx.Doer.IsActive || ctx.Doer.ProhibitLogin {
+				log.Info("Failed authentication attempt for %s from %s", ctx.Doer.Name, ctx.RemoteAddr())
+				ctx.Data["Title"] = ctx.Tr("auth.prohibit_login")
+				ctx.JSON(http.StatusForbidden, map[string]string{
+					"message": "This account is prohibited from signing in, please contact your site administrator.",
+				})
+				return
+			}
+
+			if ctx.Doer.MustChangePassword {
+				ctx.JSON(http.StatusForbidden, map[string]string{
+					"message": "You must change your password. Change it at: " + setting.AppURL + "/user/change_password",
+				})
+				return
+			}
+		}
+
+		// Redirect to dashboard if user tries to visit any non-login page.
+		if options.SignOutRequired && ctx.IsSigned && ctx.Req.URL.RequestURI() != "/" {
+			ctx.Redirect(setting.AppSubURL + "/")
+			return
+		}
+
+		if options.SignInRequired {
+			if !ctx.IsSigned {
+				// Restrict API calls with error message.
+				ctx.JSON(http.StatusForbidden, map[string]string{
+					"message": "Only signed in user is allowed to call APIs.",
+				})
+				return
+			} else if !ctx.Doer.IsActive && setting.Service.RegisterEmailConfirm {
+				ctx.Data["Title"] = ctx.Tr("auth.active_your_account")
+				ctx.HTML(http.StatusOK, "user/auth/activate")
+				return
+			}
+			if ctx.IsSigned && ctx.IsBasicAuth {
+				if skip, ok := ctx.Data["SkipLocalTwoFA"]; ok && skip.(bool) {
+					return // Skip 2FA
+				}
+				twofa, err := auth.GetTwoFactorByUID(ctx.Doer.ID)
+				if err != nil {
+					if auth.IsErrTwoFactorNotEnrolled(err) {
+						return // No 2FA enrollment for this user
+					}
+					ctx.InternalServerError(err)
+					return
+				}
+				otpHeader := ctx.Req.Header.Get("X-Gitea-OTP")
+				ok, err := twofa.ValidateTOTP(otpHeader)
+				if err != nil {
+					ctx.InternalServerError(err)
+					return
+				}
+				if !ok {
+					ctx.JSON(http.StatusForbidden, map[string]string{
+						"message": "Only signed in user is allowed to call APIs.",
+					})
+					return
+				}
+			}
+		}
+
+		if options.AdminRequired {
+			if !ctx.Doer.IsAdmin {
+				ctx.JSON(http.StatusForbidden, map[string]string{
+					"message": "You have no permission to request for this.",
+				})
+				return
+			}
+			ctx.Data["PageIsAdmin"] = true
+		}
+	}
+}