Split migrations folder (#21549)

There are too many files in `models/migrations` folder so that I split
them into sub folders.

models/migrations/v1_16/v189.go

@@ -0,0 +1,112 @@
+// Copyright 2021 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 v1_16 //nolint
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/modules/json"
+
+	"xorm.io/xorm"
+)
+
+func UnwrapLDAPSourceCfg(x *xorm.Engine) error {
+	jsonUnmarshalHandleDoubleEncode := func(bs []byte, v interface{}) error {
+		err := json.Unmarshal(bs, v)
+		if err != nil {
+			ok := true
+			rs := []byte{}
+			temp := make([]byte, 2)
+			for _, rn := range string(bs) {
+				if rn > 0xffff {
+					ok = false
+					break
+				}
+				binary.LittleEndian.PutUint16(temp, uint16(rn))
+				rs = append(rs, temp...)
+			}
+			if ok {
+				if rs[0] == 0xff && rs[1] == 0xfe {
+					rs = rs[2:]
+				}
+				err = json.Unmarshal(rs, v)
+			}
+		}
+		if err != nil && len(bs) > 2 && bs[0] == 0xff && bs[1] == 0xfe {
+			err = json.Unmarshal(bs[2:], v)
+		}
+		return err
+	}
+
+	// LoginSource represents an external way for authorizing users.
+	type LoginSource struct {
+		ID        int64 `xorm:"pk autoincr"`
+		Type      int
+		IsActived bool   `xorm:"INDEX NOT NULL DEFAULT false"`
+		IsActive  bool   `xorm:"INDEX NOT NULL DEFAULT false"`
+		Cfg       string `xorm:"TEXT"`
+	}
+
+	const ldapType = 2
+	const dldapType = 5
+
+	type WrappedSource struct {
+		Source map[string]interface{}
+	}
+
+	// change lower_email as unique
+	if err := x.Sync2(new(LoginSource)); err != nil {
+		return err
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+
+	const batchSize = 100
+	for start := 0; ; start += batchSize {
+		sources := make([]*LoginSource, 0, batchSize)
+		if err := sess.Limit(batchSize, start).Where("`type` = ? OR `type` = ?", ldapType, dldapType).Find(&sources); err != nil {
+			return err
+		}
+		if len(sources) == 0 {
+			break
+		}
+
+		for _, source := range sources {
+			wrapped := &WrappedSource{
+				Source: map[string]interface{}{},
+			}
+			err := jsonUnmarshalHandleDoubleEncode([]byte(source.Cfg), &wrapped)
+			if err != nil {
+				return fmt.Errorf("failed to unmarshal %s: %w", source.Cfg, err)
+			}
+			if wrapped.Source != nil && len(wrapped.Source) > 0 {
+				bs, err := json.Marshal(wrapped.Source)
+				if err != nil {
+					return err
+				}
+				source.Cfg = string(bs)
+				if _, err := sess.ID(source.ID).Cols("cfg").Update(source); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	if _, err := x.SetExpr("is_active", "is_actived").Update(&LoginSource{}); err != nil {
+		return fmt.Errorf("SetExpr Update failed:  %w", err)
+	}
+
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+	if err := base.DropTableColumns(sess, "login_source", "is_actived"); err != nil {
+		return err
+	}
+
+	return sess.Commit()
+}