Move login related structs and functions to models/login (#17093)

* Move login related structs and functions to models/login

* Fix test

* Fix lint

* Fix lint

* Fix lint of windows

* Fix lint

* Fix test

* Fix test

* Only load necessary fixtures when preparing unit tests envs

* Fix lint

* Fix test

* Fix test

* Fix error log

* Fix error log

* Fix error log

* remove unnecessary change

* fix error log

* merge main branch

models/db/list_options.go

@@ -0,0 +1,100 @@
+// Copyright 2020 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 db
+
+import (
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+// Paginator is the base for different ListOptions types
+type Paginator interface {
+	GetSkipTake() (skip, take int)
+	GetStartEnd() (start, end int)
+}
+
+// GetPaginatedSession creates a paginated database session
+func GetPaginatedSession(p Paginator) *xorm.Session {
+	skip, take := p.GetSkipTake()
+
+	return x.Limit(take, skip)
+}
+
+// SetSessionPagination sets pagination for a database session
+func SetSessionPagination(sess *xorm.Session, p Paginator) *xorm.Session {
+	skip, take := p.GetSkipTake()
+
+	return sess.Limit(take, skip)
+}
+
+// SetEnginePagination sets pagination for a database engine
+func SetEnginePagination(e Engine, p Paginator) Engine {
+	skip, take := p.GetSkipTake()
+
+	return e.Limit(take, skip)
+}
+
+// ListOptions options to paginate results
+type ListOptions struct {
+	PageSize int
+	Page     int // start from 1
+}
+
+// GetSkipTake returns the skip and take values
+func (opts *ListOptions) GetSkipTake() (skip, take int) {
+	opts.SetDefaultValues()
+	return (opts.Page - 1) * opts.PageSize, opts.PageSize
+}
+
+// GetStartEnd returns the start and end of the ListOptions
+func (opts *ListOptions) GetStartEnd() (start, end int) {
+	start, take := opts.GetSkipTake()
+	end = start + take
+	return
+}
+
+// SetDefaultValues sets default values
+func (opts *ListOptions) SetDefaultValues() {
+	if opts.PageSize <= 0 {
+		opts.PageSize = setting.API.DefaultPagingNum
+	}
+	if opts.PageSize > setting.API.MaxResponseItems {
+		opts.PageSize = setting.API.MaxResponseItems
+	}
+	if opts.Page <= 0 {
+		opts.Page = 1
+	}
+}
+
+// AbsoluteListOptions absolute options to paginate results
+type AbsoluteListOptions struct {
+	skip int
+	take int
+}
+
+// NewAbsoluteListOptions creates a list option with applied limits
+func NewAbsoluteListOptions(skip, take int) *AbsoluteListOptions {
+	if skip < 0 {
+		skip = 0
+	}
+	if take <= 0 {
+		take = setting.API.DefaultPagingNum
+	}
+	if take > setting.API.MaxResponseItems {
+		take = setting.API.MaxResponseItems
+	}
+	return &AbsoluteListOptions{skip, take}
+}
+
+// GetSkipTake returns the skip and take values
+func (opts *AbsoluteListOptions) GetSkipTake() (skip, take int) {
+	return opts.skip, opts.take
+}
+
+// GetStartEnd returns the start and end values
+func (opts *AbsoluteListOptions) GetStartEnd() (start, end int) {
+	return opts.skip, opts.skip + opts.take
+}