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vendor/github.com/jinzhu/copier/License

@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Jinzhu
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/jinzhu/copier/README.md

@@ -0,0 +1,132 @@
+# Copier
+
+  I am a copier, I copy everything from one to another
+
+[![test status](https://github.com/jinzhu/copier/workflows/tests/badge.svg?branch=master "test status")](https://github.com/jinzhu/copier/actions)
+
+## Features
+
+* Copy from field to field with same name
+* Copy from method to field with same name
+* Copy from field to method with same name
+* Copy from slice to slice
+* Copy from struct to slice
+* Copy from map to map
+* Enforce copying a field with a tag
+* Ignore a field with a tag
+* Deep Copy
+
+## Usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/jinzhu/copier"
+)
+
+type User struct {
+	Name        string
+	Role        string
+	Age         int32
+	EmployeCode int64 `copier:"EmployeNum"` // specify field name
+
+	// Explicitly ignored in the destination struct.
+	Salary   int
+}
+
+func (user *User) DoubleAge() int32 {
+	return 2 * user.Age
+}
+
+// Tags in the destination Struct provide instructions to copier.Copy to ignore
+// or enforce copying and to panic or return an error if a field was not copied.
+type Employee struct {
+	// Tell copier.Copy to panic if this field is not copied.
+	Name      string `copier:"must"`
+
+	// Tell copier.Copy to return an error if this field is not copied.
+	Age       int32  `copier:"must,nopanic"`
+
+	// Tell copier.Copy to explicitly ignore copying this field.
+	Salary    int    `copier:"-"`
+
+	DoubleAge int32
+	EmployeId int64 `copier:"EmployeNum"` // specify field name
+	SuperRole string
+}
+
+func (employee *Employee) Role(role string) {
+	employee.SuperRole = "Super " + role
+}
+
+func main() {
+	var (
+		user      = User{Name: "Jinzhu", Age: 18, Role: "Admin", Salary: 200000}
+		users     = []User{{Name: "Jinzhu", Age: 18, Role: "Admin", Salary: 100000}, {Name: "jinzhu 2", Age: 30, Role: "Dev", Salary: 60000}}
+		employee  = Employee{Salary: 150000}
+		employees = []Employee{}
+	)
+
+	copier.Copy(&employee, &user)
+
+	fmt.Printf("%#v \n", employee)
+	// Employee{
+	//    Name: "Jinzhu",           // Copy from field
+	//    Age: 18,                  // Copy from field
+	//    Salary:150000,            // Copying explicitly ignored
+	//    DoubleAge: 36,            // Copy from method
+	//    EmployeeId: 0,            // Ignored
+	//    SuperRole: "Super Admin", // Copy to method
+	// }
+
+	// Copy struct to slice
+	copier.Copy(&employees, &user)
+
+	fmt.Printf("%#v \n", employees)
+	// []Employee{
+	//   {Name: "Jinzhu", Age: 18, Salary:0, DoubleAge: 36, EmployeId: 0, SuperRole: "Super Admin"}
+	// }
+
+	// Copy slice to slice
+	employees = []Employee{}
+	copier.Copy(&employees, &users)
+
+	fmt.Printf("%#v \n", employees)
+	// []Employee{
+	//   {Name: "Jinzhu", Age: 18, Salary:0, DoubleAge: 36, EmployeId: 0, SuperRole: "Super Admin"},
+	//   {Name: "jinzhu 2", Age: 30, Salary:0, DoubleAge: 60, EmployeId: 0, SuperRole: "Super Dev"},
+	// }
+
+ 	// Copy map to map
+	map1 := map[int]int{3: 6, 4: 8}
+	map2 := map[int32]int8{}
+	copier.Copy(&map2, map1)
+
+	fmt.Printf("%#v \n", map2)
+	// map[int32]int8{3:6, 4:8}
+}
+```
+
+### Copy with Option
+
+```go
+copier.CopyWithOption(&to, &from, copier.Option{IgnoreEmpty: true, DeepCopy: true})
+```
+
+## Contributing
+
+You can help to make the project better, check out [http://gorm.io/contribute.html](http://gorm.io/contribute.html) for things you can do.
+
+# Author
+
+**jinzhu**
+
+* <http://github.com/jinzhu>
+* <wosmvp@gmail.com>
+* <http://twitter.com/zhangjinzhu>
+
+## License
+
+Released under the [MIT License](https://github.com/jinzhu/copier/blob/master/License).

vendor/github.com/jinzhu/copier/copier.go

@@ -0,0 +1,697 @@
+package copier
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"errors"
+	"fmt"
+	"reflect"
+	"strings"
+	"unicode"
+)
+
+// These flags define options for tag handling
+const (
+	// Denotes that a destination field must be copied to. If copying fails then a panic will ensue.
+	tagMust uint8 = 1 << iota
+
+	// Denotes that the program should not panic when the must flag is on and
+	// value is not copied. The program will return an error instead.
+	tagNoPanic
+
+	// Ignore a destination field from being copied to.
+	tagIgnore
+
+	// Denotes that the value as been copied
+	hasCopied
+
+	// Some default converter types for a nicer syntax
+	String  string  = ""
+	Bool    bool    = false
+	Int     int     = 0
+	Float32 float32 = 0
+	Float64 float64 = 0
+)
+
+// Option sets copy options
+type Option struct {
+	// setting this value to true will ignore copying zero values of all the fields, including bools, as well as a
+	// struct having all it's fields set to their zero values respectively (see IsZero() in reflect/value.go)
+	IgnoreEmpty bool
+	DeepCopy    bool
+	Converters  []TypeConverter
+}
+
+type TypeConverter struct {
+	SrcType interface{}
+	DstType interface{}
+	Fn      func(src interface{}) (interface{}, error)
+}
+
+type converterPair struct {
+	SrcType reflect.Type
+	DstType reflect.Type
+}
+
+// Tag Flags
+type flags struct {
+	BitFlags  map[string]uint8
+	SrcNames  tagNameMapping
+	DestNames tagNameMapping
+}
+
+// Field Tag name mapping
+type tagNameMapping struct {
+	FieldNameToTag map[string]string
+	TagToFieldName map[string]string
+}
+
+// Copy copy things
+func Copy(toValue interface{}, fromValue interface{}) (err error) {
+	return copier(toValue, fromValue, Option{})
+}
+
+// CopyWithOption copy with option
+func CopyWithOption(toValue interface{}, fromValue interface{}, opt Option) (err error) {
+	return copier(toValue, fromValue, opt)
+}
+
+func copier(toValue interface{}, fromValue interface{}, opt Option) (err error) {
+	var (
+		isSlice    bool
+		amount     = 1
+		from       = indirect(reflect.ValueOf(fromValue))
+		to         = indirect(reflect.ValueOf(toValue))
+		converters map[converterPair]TypeConverter
+	)
+
+	// save convertes into map for faster lookup
+	for i := range opt.Converters {
+		if converters == nil {
+			converters = make(map[converterPair]TypeConverter)
+		}
+
+		pair := converterPair{
+			SrcType: reflect.TypeOf(opt.Converters[i].SrcType),
+			DstType: reflect.TypeOf(opt.Converters[i].DstType),
+		}
+
+		converters[pair] = opt.Converters[i]
+	}
+
+	if !to.CanAddr() {
+		return ErrInvalidCopyDestination
+	}
+
+	// Return is from value is invalid
+	if !from.IsValid() {
+		return ErrInvalidCopyFrom
+	}
+
+	fromType, isPtrFrom := indirectType(from.Type())
+	toType, _ := indirectType(to.Type())
+
+	if fromType.Kind() == reflect.Interface {
+		fromType = reflect.TypeOf(from.Interface())
+	}
+
+	if toType.Kind() == reflect.Interface {
+		toType, _ = indirectType(reflect.TypeOf(to.Interface()))
+		oldTo := to
+		to = reflect.New(reflect.TypeOf(to.Interface())).Elem()
+		defer func() {
+			oldTo.Set(to)
+		}()
+	}
+
+	// Just set it if possible to assign for normal types
+	if from.Kind() != reflect.Slice && from.Kind() != reflect.Struct && from.Kind() != reflect.Map && (from.Type().AssignableTo(to.Type()) || from.Type().ConvertibleTo(to.Type())) {
+		if !isPtrFrom || !opt.DeepCopy {
+			to.Set(from.Convert(to.Type()))
+		} else {
+			fromCopy := reflect.New(from.Type())
+			fromCopy.Set(from.Elem())
+			to.Set(fromCopy.Convert(to.Type()))
+		}
+		return
+	}
+
+	if from.Kind() != reflect.Slice && fromType.Kind() == reflect.Map && toType.Kind() == reflect.Map {
+		if !fromType.Key().ConvertibleTo(toType.Key()) {
+			return ErrMapKeyNotMatch
+		}
+
+		if to.IsNil() {
+			to.Set(reflect.MakeMapWithSize(toType, from.Len()))
+		}
+
+		for _, k := range from.MapKeys() {
+			toKey := indirect(reflect.New(toType.Key()))
+			if !set(toKey, k, opt.DeepCopy, converters) {
+				return fmt.Errorf("%w map, old key: %v, new key: %v", ErrNotSupported, k.Type(), toType.Key())
+			}
+
+			elemType := toType.Elem()
+			if elemType.Kind() != reflect.Slice {
+				elemType, _ = indirectType(elemType)
+			}
+			toValue := indirect(reflect.New(elemType))
+			if !set(toValue, from.MapIndex(k), opt.DeepCopy, converters) {
+				if err = copier(toValue.Addr().Interface(), from.MapIndex(k).Interface(), opt); err != nil {
+					return err
+				}
+			}
+
+			for {
+				if elemType == toType.Elem() {
+					to.SetMapIndex(toKey, toValue)
+					break
+				}
+				elemType = reflect.PtrTo(elemType)
+				toValue = toValue.Addr()
+			}
+		}
+		return
+	}
+
+	if from.Kind() == reflect.Slice && to.Kind() == reflect.Slice && fromType.ConvertibleTo(toType) {
+		if to.IsNil() {
+			slice := reflect.MakeSlice(reflect.SliceOf(to.Type().Elem()), from.Len(), from.Cap())
+			to.Set(slice)
+		}
+
+		for i := 0; i < from.Len(); i++ {
+			if to.Len() < i+1 {
+				to.Set(reflect.Append(to, reflect.New(to.Type().Elem()).Elem()))
+			}
+
+			if !set(to.Index(i), from.Index(i), opt.DeepCopy, converters) {
+				// ignore error while copy slice element
+				err = copier(to.Index(i).Addr().Interface(), from.Index(i).Interface(), opt)
+				if err != nil {
+					continue
+				}
+			}
+		}
+		return
+	}
+
+	if fromType.Kind() != reflect.Struct || toType.Kind() != reflect.Struct {
+		// skip not supported type
+		return
+	}
+
+	if from.Kind() == reflect.Slice || to.Kind() == reflect.Slice {
+		isSlice = true
+		if from.Kind() == reflect.Slice {
+			amount = from.Len()
+		}
+	}
+
+	for i := 0; i < amount; i++ {
+		var dest, source reflect.Value
+
+		if isSlice {
+			// source
+			if from.Kind() == reflect.Slice {
+				source = indirect(from.Index(i))
+			} else {
+				source = indirect(from)
+			}
+			// dest
+			dest = indirect(reflect.New(toType).Elem())
+		} else {
+			source = indirect(from)
+			dest = indirect(to)
+		}
+
+		destKind := dest.Kind()
+		initDest := false
+		if destKind == reflect.Interface {
+			initDest = true
+			dest = indirect(reflect.New(toType))
+		}
+
+		// Get tag options
+		flgs, err := getFlags(dest, source, toType, fromType)
+		if err != nil {
+			return err
+		}
+
+		// check source
+		if source.IsValid() {
+			copyUnexportedStructFields(dest, source)
+
+			// Copy from source field to dest field or method
+			fromTypeFields := deepFields(fromType)
+			for _, field := range fromTypeFields {
+				name := field.Name
+
+				// Get bit flags for field
+				fieldFlags, _ := flgs.BitFlags[name]
+
+				// Check if we should ignore copying
+				if (fieldFlags & tagIgnore) != 0 {
+					continue
+				}
+
+				srcFieldName, destFieldName := getFieldName(name, flgs)
+				if fromField := source.FieldByName(srcFieldName); fromField.IsValid() && !shouldIgnore(fromField, opt.IgnoreEmpty) {
+					// process for nested anonymous field
+					destFieldNotSet := false
+					if f, ok := dest.Type().FieldByName(destFieldName); ok {
+						for idx := range f.Index {
+							destField := dest.FieldByIndex(f.Index[:idx+1])
+
+							if destField.Kind() != reflect.Ptr {
+								continue
+							}
+
+							if !destField.IsNil() {
+								continue
+							}
+							if !destField.CanSet() {
+								destFieldNotSet = true
+								break
+							}
+
+							// destField is a nil pointer that can be set
+							newValue := reflect.New(destField.Type().Elem())
+							destField.Set(newValue)
+						}
+					}
+
+					if destFieldNotSet {
+						break
+					}
+
+					toField := dest.FieldByName(destFieldName)
+					if toField.IsValid() {
+						if toField.CanSet() {
+							if !set(toField, fromField, opt.DeepCopy, converters) {
+								if err := copier(toField.Addr().Interface(), fromField.Interface(), opt); err != nil {
+									return err
+								}
+							}
+							if fieldFlags != 0 {
+								// Note that a copy was made
+								flgs.BitFlags[name] = fieldFlags | hasCopied
+							}
+						}
+					} else {
+						// try to set to method
+						var toMethod reflect.Value
+						if dest.CanAddr() {
+							toMethod = dest.Addr().MethodByName(destFieldName)
+						} else {
+							toMethod = dest.MethodByName(destFieldName)
+						}
+
+						if toMethod.IsValid() && toMethod.Type().NumIn() == 1 && fromField.Type().AssignableTo(toMethod.Type().In(0)) {
+							toMethod.Call([]reflect.Value{fromField})
+						}
+					}
+				}
+			}
+
+			// Copy from from method to dest field
+			for _, field := range deepFields(toType) {
+				name := field.Name
+				srcFieldName, destFieldName := getFieldName(name, flgs)
+
+				var fromMethod reflect.Value
+				if source.CanAddr() {
+					fromMethod = source.Addr().MethodByName(srcFieldName)
+				} else {
+					fromMethod = source.MethodByName(srcFieldName)
+				}
+
+				if fromMethod.IsValid() && fromMethod.Type().NumIn() == 0 && fromMethod.Type().NumOut() == 1 && !shouldIgnore(fromMethod, opt.IgnoreEmpty) {
+					if toField := dest.FieldByName(destFieldName); toField.IsValid() && toField.CanSet() {
+						values := fromMethod.Call([]reflect.Value{})
+						if len(values) >= 1 {
+							set(toField, values[0], opt.DeepCopy, converters)
+						}
+					}
+				}
+			}
+		}
+
+		if isSlice && to.Kind() == reflect.Slice {
+			if dest.Addr().Type().AssignableTo(to.Type().Elem()) {
+				if to.Len() < i+1 {
+					to.Set(reflect.Append(to, dest.Addr()))
+				} else {
+					if !set(to.Index(i), dest.Addr(), opt.DeepCopy, converters) {
+						// ignore error while copy slice element
+						err = copier(to.Index(i).Addr().Interface(), dest.Addr().Interface(), opt)
+						if err != nil {
+							continue
+						}
+					}
+				}
+			} else if dest.Type().AssignableTo(to.Type().Elem()) {
+				if to.Len() < i+1 {
+					to.Set(reflect.Append(to, dest))
+				} else {
+					if !set(to.Index(i), dest, opt.DeepCopy, converters) {
+						// ignore error while copy slice element
+						err = copier(to.Index(i).Addr().Interface(), dest.Interface(), opt)
+						if err != nil {
+							continue
+						}
+					}
+				}
+			}
+		} else if initDest {
+			to.Set(dest)
+		}
+
+		err = checkBitFlags(flgs.BitFlags)
+	}
+
+	return
+}
+
+func copyUnexportedStructFields(to, from reflect.Value) {
+	if from.Kind() != reflect.Struct || to.Kind() != reflect.Struct || !from.Type().AssignableTo(to.Type()) {
+		return
+	}
+
+	// create a shallow copy of 'to' to get all fields
+	tmp := indirect(reflect.New(to.Type()))
+	tmp.Set(from)
+
+	// revert exported fields
+	for i := 0; i < to.NumField(); i++ {
+		if tmp.Field(i).CanSet() {
+			tmp.Field(i).Set(to.Field(i))
+		}
+	}
+	to.Set(tmp)
+}
+
+func shouldIgnore(v reflect.Value, ignoreEmpty bool) bool {
+	if !ignoreEmpty {
+		return false
+	}
+
+	return v.IsZero()
+}
+
+func deepFields(reflectType reflect.Type) []reflect.StructField {
+	if reflectType, _ = indirectType(reflectType); reflectType.Kind() == reflect.Struct {
+		fields := make([]reflect.StructField, 0, reflectType.NumField())
+
+		for i := 0; i < reflectType.NumField(); i++ {
+			v := reflectType.Field(i)
+			// PkgPath is the package path that qualifies a lower case (unexported)
+			// field name. It is empty for upper case (exported) field names.
+			// See https://golang.org/ref/spec#Uniqueness_of_identifiers
+			if v.PkgPath == "" {
+				fields = append(fields, v)
+				if v.Anonymous {
+					// also consider fields of anonymous fields as fields of the root
+					fields = append(fields, deepFields(v.Type)...)
+				}
+			}
+		}
+
+		return fields
+	}
+
+	return nil
+}
+
+func indirect(reflectValue reflect.Value) reflect.Value {
+	for reflectValue.Kind() == reflect.Ptr {
+		reflectValue = reflectValue.Elem()
+	}
+	return reflectValue
+}
+
+func indirectType(reflectType reflect.Type) (_ reflect.Type, isPtr bool) {
+	for reflectType.Kind() == reflect.Ptr || reflectType.Kind() == reflect.Slice {
+		reflectType = reflectType.Elem()
+		isPtr = true
+	}
+	return reflectType, isPtr
+}
+
+func set(to, from reflect.Value, deepCopy bool, converters map[converterPair]TypeConverter) bool {
+	if from.IsValid() {
+		if ok, err := lookupAndCopyWithConverter(to, from, converters); err != nil {
+			return false
+		} else if ok {
+			return true
+		}
+
+		if to.Kind() == reflect.Ptr {
+			// set `to` to nil if from is nil
+			if from.Kind() == reflect.Ptr && from.IsNil() {
+				to.Set(reflect.Zero(to.Type()))
+				return true
+			} else if to.IsNil() {
+				// `from`         -> `to`
+				// sql.NullString -> *string
+				if fromValuer, ok := driverValuer(from); ok {
+					v, err := fromValuer.Value()
+					if err != nil {
+						return false
+					}
+					// if `from` is not valid do nothing with `to`
+					if v == nil {
+						return true
+					}
+				}
+				// allocate new `to` variable with default value (eg. *string -> new(string))
+				to.Set(reflect.New(to.Type().Elem()))
+			}
+			// depointer `to`
+			to = to.Elem()
+		}
+
+		if deepCopy {
+			toKind := to.Kind()
+			if toKind == reflect.Interface && to.IsNil() {
+				if reflect.TypeOf(from.Interface()) != nil {
+					to.Set(reflect.New(reflect.TypeOf(from.Interface())).Elem())
+					toKind = reflect.TypeOf(to.Interface()).Kind()
+				}
+			}
+			if from.Kind() == reflect.Ptr && from.IsNil() {
+				return true
+			}
+			if toKind == reflect.Struct || toKind == reflect.Map || toKind == reflect.Slice {
+				return false
+			}
+		}
+
+		if from.Type().ConvertibleTo(to.Type()) {
+			to.Set(from.Convert(to.Type()))
+		} else if toScanner, ok := to.Addr().Interface().(sql.Scanner); ok {
+			// `from`  -> `to`
+			// *string -> sql.NullString
+			if from.Kind() == reflect.Ptr {
+				// if `from` is nil do nothing with `to`
+				if from.IsNil() {
+					return true
+				}
+				// depointer `from`
+				from = indirect(from)
+			}
+			// `from` -> `to`
+			// string -> sql.NullString
+			// set `to` by invoking method Scan(`from`)
+			err := toScanner.Scan(from.Interface())
+			if err != nil {
+				return false
+			}
+		} else if fromValuer, ok := driverValuer(from); ok {
+			// `from`         -> `to`
+			// sql.NullString -> string
+			v, err := fromValuer.Value()
+			if err != nil {
+				return false
+			}
+			// if `from` is not valid do nothing with `to`
+			if v == nil {
+				return true
+			}
+			rv := reflect.ValueOf(v)
+			if rv.Type().AssignableTo(to.Type()) {
+				to.Set(rv)
+			}
+		} else if from.Kind() == reflect.Ptr {
+			return set(to, from.Elem(), deepCopy, converters)
+		} else {
+			return false
+		}
+	}
+
+	return true
+}
+
+// lookupAndCopyWithConverter looks up the type pair, on success the TypeConverter Fn func is called to copy src to dst field.
+func lookupAndCopyWithConverter(to, from reflect.Value, converters map[converterPair]TypeConverter) (copied bool, err error) {
+	pair := converterPair{
+		SrcType: from.Type(),
+		DstType: to.Type(),
+	}
+
+	if cnv, ok := converters[pair]; ok {
+		result, err := cnv.Fn(from.Interface())
+
+		if err != nil {
+			return false, err
+		}
+
+		if result != nil {
+			to.Set(reflect.ValueOf(result))
+		} else {
+			// in case we've got a nil value to copy
+			to.Set(reflect.Zero(to.Type()))
+		}
+
+		return true, nil
+	}
+
+	return false, nil
+}
+
+// parseTags Parses struct tags and returns uint8 bit flags.
+func parseTags(tag string) (flg uint8, name string, err error) {
+	for _, t := range strings.Split(tag, ",") {
+		switch t {
+		case "-":
+			flg = tagIgnore
+			return
+		case "must":
+			flg = flg | tagMust
+		case "nopanic":
+			flg = flg | tagNoPanic
+		default:
+			if unicode.IsUpper([]rune(t)[0]) {
+				name = strings.TrimSpace(t)
+			} else {
+				err = errors.New("copier field name tag must be start upper case")
+			}
+		}
+	}
+	return
+}
+
+// getTagFlags Parses struct tags for bit flags, field name.
+func getFlags(dest, src reflect.Value, toType, fromType reflect.Type) (flags, error) {
+	flgs := flags{
+		BitFlags: map[string]uint8{},
+		SrcNames: tagNameMapping{
+			FieldNameToTag: map[string]string{},
+			TagToFieldName: map[string]string{},
+		},
+		DestNames: tagNameMapping{
+			FieldNameToTag: map[string]string{},
+			TagToFieldName: map[string]string{},
+		},
+	}
+	var toTypeFields, fromTypeFields []reflect.StructField
+	if dest.IsValid() {
+		toTypeFields = deepFields(toType)
+	}
+	if src.IsValid() {
+		fromTypeFields = deepFields(fromType)
+	}
+
+	// Get a list dest of tags
+	for _, field := range toTypeFields {
+		tags := field.Tag.Get("copier")
+		if tags != "" {
+			var name string
+			var err error
+			if flgs.BitFlags[field.Name], name, err = parseTags(tags); err != nil {
+				return flags{}, err
+			} else if name != "" {
+				flgs.DestNames.FieldNameToTag[field.Name] = name
+				flgs.DestNames.TagToFieldName[name] = field.Name
+			}
+		}
+	}
+
+	// Get a list source of tags
+	for _, field := range fromTypeFields {
+		tags := field.Tag.Get("copier")
+		if tags != "" {
+			var name string
+			var err error
+			if _, name, err = parseTags(tags); err != nil {
+				return flags{}, err
+			} else if name != "" {
+				flgs.SrcNames.FieldNameToTag[field.Name] = name
+				flgs.SrcNames.TagToFieldName[name] = field.Name
+			}
+		}
+	}
+	return flgs, nil
+}
+
+// checkBitFlags Checks flags for error or panic conditions.
+func checkBitFlags(flagsList map[string]uint8) (err error) {
+	// Check flag conditions were met
+	for name, flgs := range flagsList {
+		if flgs&hasCopied == 0 {
+			switch {
+			case flgs&tagMust != 0 && flgs&tagNoPanic != 0:
+				err = fmt.Errorf("field %s has must tag but was not copied", name)
+				return
+			case flgs&(tagMust) != 0:
+				panic(fmt.Sprintf("Field %s has must tag but was not copied", name))
+			}
+		}
+	}
+	return
+}
+
+func getFieldName(fieldName string, flgs flags) (srcFieldName string, destFieldName string) {
+	// get dest field name
+	if srcTagName, ok := flgs.SrcNames.FieldNameToTag[fieldName]; ok {
+		destFieldName = srcTagName
+		if destTagName, ok := flgs.DestNames.TagToFieldName[srcTagName]; ok {
+			destFieldName = destTagName
+		}
+	} else {
+		if destTagName, ok := flgs.DestNames.TagToFieldName[fieldName]; ok {
+			destFieldName = destTagName
+		}
+	}
+	if destFieldName == "" {
+		destFieldName = fieldName
+	}
+
+	// get source field name
+	if destTagName, ok := flgs.DestNames.FieldNameToTag[fieldName]; ok {
+		srcFieldName = destTagName
+		if srcField, ok := flgs.SrcNames.TagToFieldName[destTagName]; ok {
+			srcFieldName = srcField
+		}
+	} else {
+		if srcField, ok := flgs.SrcNames.TagToFieldName[fieldName]; ok {
+			srcFieldName = srcField
+		}
+	}
+
+	if srcFieldName == "" {
+		srcFieldName = fieldName
+	}
+	return
+}
+
+func driverValuer(v reflect.Value) (i driver.Valuer, ok bool) {
+
+	if !v.CanAddr() {
+		i, ok = v.Interface().(driver.Valuer)
+		return
+	}
+
+	i, ok = v.Addr().Interface().(driver.Valuer)
+	return
+}

vendor/github.com/jinzhu/copier/errors.go

@@ -0,0 +1,10 @@
+package copier
+
+import "errors"
+
+var (
+	ErrInvalidCopyDestination = errors.New("copy destination is invalid")
+	ErrInvalidCopyFrom        = errors.New("copy from is invalid")
+	ErrMapKeyNotMatch         = errors.New("map's key type doesn't match")
+	ErrNotSupported           = errors.New("not supported")
+)