Merge pull request #101 from miraclesu/valid

Valid

+validation
+==============
+
+validation is a form validation for a data validation and error collecting using Go.
+
+## Installation and tests
+
+Install:
+
+	go get github.com/astaxie/beego/validation
+
+Test:
+
+	go test github.com/astaxie/beego/validation
+
+## Example
+
+Direct Use:
+
+	import (
+		"github.com/astaxie/beego/validation"
+		"log"
+	)
+
+	type User struct {
+		Name string
+		Age int
+	}
+
+	func main() {
+		u := User{"man", 40}
+		valid := validation.Validation{}
+		valid.Required(u.Name, "name")
+		valid.MaxSize(u.Name, 15, "nameMax")
+		valid.Range(u.Age, 0, 140, "age")
+		if valid.HasErrors {
+			// validation does not pass
+			// print invalid message
+			for _, err := range valid.Errors {
+				log.Println(err.Key, err.Message)
+			}
+		}
+		// or use like this
+		if v := valid.Max(u.Age, 140); !v.Ok {
+			log.Println(v.Error.Key, v.Error.Message)
+		}
+	}
+
+Struct Tag Use:
+
+	import (
+		"github.com/astaxie/beego/validation"
+	)
+
+	// validation function follow with "valid" tag
+	// functions divide with ";"
+	// parameters in parentheses "()" and divide with ","
+	type user struct {
+		Id   int
+		Name string `valid:"Required"`
+		Age  int    `valid:"Required;Range(1, 140)"`
+	}
+
+	func main() {
+		valid := Validation{}
+		u := user{Name: "test", Age: 40}
+		b, err := valid.Valid(u)
+		if err != nil {
+			// handle error
+		}
+		if !b {
+			// validation does not pass
+			// blabla...
+		}
+	}
+
+Struct Tag Functions:
+
+	Required
+	Min(min int)
+	Max(max int)
+	Range(min, max int)
+	MinSize(min int)
+	MaxSize(max int)
+	Length(length int)
+	Alpha
+	Numeric
+	AlphaNumeric
+	Match(regexp string)		// does not support yet
+	NoMatch(regexp string)	// does not support yet
+	AlphaDash
+	Email
+	IP
+	Base64
+
+
+## LICENSE
+
+BSD License http://creativecommons.org/licenses/BSD/

+package validation
+
+import (
+	"fmt"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+const (
+	VALIDTAG = "valid"
+)
+
+var (
+	// key: function name
+	// value: the number of parameters
+	funcs = make(Funcs)
+
+	// doesn't belong to validation functions
+	unFuncs = map[string]bool{
+		"Clear":     true,
+		"HasErrors": true,
+		"ErrorMap":  true,
+		"Error":     true,
+		"apply":     true,
+		"Check":     true,
+		"Valid":     true,
+	}
+)
+
+func init() {
+	v := &Validation{}
+	t := reflect.TypeOf(v)
+	for i := 0; i < t.NumMethod(); i++ {
+		m := t.Method(i)
+		if !unFuncs[m.Name] {
+			funcs[m.Name] = m.Func
+		}
+	}
+}
+
+type ValidFunc struct {
+	Name   string
+	Params []interface{}
+}
+
+type Funcs map[string]reflect.Value
+
+func (f Funcs) Call(name string, params ...interface{}) (result []reflect.Value, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = r.(error)
+		}
+	}()
+	if _, ok := f[name]; !ok {
+		err = fmt.Errorf("%s does not exist", name)
+		return
+	}
+	if len(params) != f[name].Type().NumIn() {
+		err = fmt.Errorf("The number of params is not adapted")
+		return
+	}
+	in := make([]reflect.Value, len(params))
+	for k, param := range params {
+		in[k] = reflect.ValueOf(param)
+	}
+	result = f[name].Call(in)
+	return
+}
+
+func isStruct(t reflect.Type) bool {
+	return t.Kind() == reflect.Struct
+}
+
+func isStructPtr(t reflect.Type) bool {
+	return t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Struct
+}
+
+func getValidFuncs(f reflect.StructField) (vfs []ValidFunc, err error) {
+	tag := f.Tag.Get(VALIDTAG)
+	if len(tag) == 0 {
+		return
+	}
+	fs := strings.Split(tag, ";")
+	for _, vfunc := range fs {
+		var vf ValidFunc
+		vf, err = parseFunc(vfunc)
+		if err != nil {
+			return
+		}
+		vfs = append(vfs, vf)
+	}
+	return
+}
+
+func parseFunc(vfunc string) (v ValidFunc, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = r.(error)
+		}
+	}()
+
+	vfunc = strings.TrimSpace(vfunc)
+	start := strings.Index(vfunc, "(")
+	var num int
+
+	// doesn't need parameter valid function
+	if start == -1 {
+		if num, err = numIn(vfunc); err != nil {
+			return
+		}
+		if num != 0 {
+			err = fmt.Errorf("%s require %d parameters", vfunc, num)
+			return
+		}
+		v = ValidFunc{vfunc, []interface{}{vfunc}}
+		return
+	}
+
+	end := strings.Index(vfunc, ")")
+	if end == -1 {
+		err = fmt.Errorf("invalid valid function")
+		return
+	}
+
+	name := strings.TrimSpace(vfunc[:start])
+	if num, err = numIn(name); err != nil {
+		return
+	}
+
+	params := strings.Split(vfunc[start+1:end], ",")
+	// the num of param must be equal
+	if num != len(params) {
+		err = fmt.Errorf("%s require %d parameters", name, num)
+		return
+	}
+
+	tParams, err := trim(name, params)
+	if err != nil {
+		return
+	}
+	v = ValidFunc{name, tParams}
+	return
+}
+
+func numIn(name string) (num int, err error) {
+	fn, ok := funcs[name]
+	if !ok {
+		err = fmt.Errorf("doesn't exsits %s valid function", name)
+		return
+	}
+	// sub *Validation obj and key
+	num = fn.Type().NumIn() - 3
+	return
+}
+
+func trim(name string, s []string) (ts []interface{}, err error) {
+	ts = make([]interface{}, len(s), len(s)+1)
+	fn, ok := funcs[name]
+	if !ok {
+		err = fmt.Errorf("doesn't exsits %s valid function", name)
+		return
+	}
+	for i := 0; i < len(s); i++ {
+		var param interface{}
+		// skip *Validation and obj params
+		if param, err = magic(fn.Type().In(i+2), strings.TrimSpace(s[i])); err != nil {
+			return
+		}
+		ts[i] = param
+	}
+	ts = append(ts, name)
+	return
+}
+
+// modify the parameters's type to adapt the function input parameters' type
+func magic(t reflect.Type, s string) (i interface{}, err error) {
+	switch t.Kind() {
+	case reflect.Int:
+		i, err = strconv.Atoi(s)
+	case reflect.String:
+		i = s
+	case reflect.Ptr:
+		if t.Elem().String() != "regexp.Regexp" {
+			err = fmt.Errorf("does not support %s", t.Elem().String())
+			return
+		}
+		i, err = regexp.Compile(s)
+	default:
+		err = fmt.Errorf("does not support %s", t.Kind().String())
+	}
+	return
+}
+
+func mergeParam(v *Validation, obj interface{}, params []interface{}) []interface{} {
+	return append([]interface{}{v, obj}, params...)
+}

+package validation
+
+import (
+	"reflect"
+	"testing"
+)
+
+type user struct {
+	Id   int
+	Tag  string `valid:"Maxx(aa)"`
+	Name string `valid:"Required"`
+	Age  int    `valid:"Required;Range(1, 140)"`
+}
+
+func TestGetValidFuncs(t *testing.T) {
+	u := user{Name: "test", Age: 1}
+	tf := reflect.TypeOf(u)
+	var vfs []ValidFunc
+	var err error
+
+	f, _ := tf.FieldByName("Id")
+	if vfs, err = getValidFuncs(f); err != nil {
+		t.Fatal(err)
+	}
+	if len(vfs) != 0 {
+		t.Fatal("should get none ValidFunc")
+	}
+
+	f, _ = tf.FieldByName("Tag")
+	if vfs, err = getValidFuncs(f); err.Error() != "doesn't exsits Maxx valid function" {
+		t.Fatal(err)
+	}
+
+	f, _ = tf.FieldByName("Name")
+	if vfs, err = getValidFuncs(f); err != nil {
+		t.Fatal(err)
+	}
+	if len(vfs) != 1 {
+		t.Fatal("should get 1 ValidFunc")
+	}
+	if vfs[0].Name != "Required" && len(vfs[0].Params) != 0 {
+		t.Error("Required funcs should be got")
+	}
+
+	f, _ = tf.FieldByName("Age")
+	if vfs, err = getValidFuncs(f); err != nil {
+		t.Fatal(err)
+	}
+	if len(vfs) != 2 {
+		t.Fatal("should get 2 ValidFunc")
+	}
+	if vfs[0].Name != "Required" && len(vfs[0].Params) != 0 {
+		t.Error("Required funcs should be got")
+	}
+	if vfs[1].Name != "Range" && len(vfs[1].Params) != 2 {
+		t.Error("Range funcs should be got")
+	}
+}
+
+func TestCall(t *testing.T) {
+	u := user{Name: "test", Age: 180}
+	tf := reflect.TypeOf(u)
+	var vfs []ValidFunc
+	var err error
+	f, _ := tf.FieldByName("Age")
+	if vfs, err = getValidFuncs(f); err != nil {
+		t.Fatal(err)
+	}
+	valid := &Validation{}
+	vfs[1].Params = append([]interface{}{valid, u.Age}, vfs[1].Params...)
+	if _, err = funcs.Call(vfs[1].Name, vfs[1].Params...); err != nil {
+		t.Fatal(err)
+	}
+	if len(valid.Errors) != 1 {
+		t.Error("age out of range should be has an error")
+	}
+}

@@ -2,6 +2,7 @@ package validation
 
 
 import (
 import (
 	"fmt"
 	"fmt"
+	"reflect"
 	"regexp"
 	"regexp"
 )
 )
 
 
@@ -175,3 +176,32 @@ func (v *Validation) Check(obj interface{}, checks ...Validator) *ValidationResu
 	}
 	}
 	return result
 	return result
 }
 }
+
+// the obj parameter must be a struct or a struct pointer
+func (v *Validation) Valid(obj interface{}) (b bool, err error) {
+	objT := reflect.TypeOf(obj)
+	objV := reflect.ValueOf(obj)
+	switch {
+	case isStruct(objT):
+	case isStructPtr(objT):
+		objT = objT.Elem()
+		objV = objV.Elem()
+	default:
+		err = fmt.Errorf("%v must be a struct or a struct pointer", obj)
+		return
+	}
+
+	for i := 0; i < objT.NumField(); i++ {
+		var vfs []ValidFunc
+		if vfs, err = getValidFuncs(objT.Field(i)); err != nil {
+			return
+		}
+		for _, vf := range vfs {
+			if _, err = funcs.Call(vf.Name,
+				mergeParam(v, objV.Field(i).Interface(), vf.Params)...); err != nil {
+				return
+			}
+		}
+	}
+	return !v.HasErrors(), nil
+}

@@ -31,7 +31,7 @@ func TestRequired(t *testing.T) {
 		t.Error("empty slice should be false")
 		t.Error("empty slice should be false")
 	}
 	}
 	if !valid.Required([]interface{}{"ok"}, "slice").Ok {
 	if !valid.Required([]interface{}{"ok"}, "slice").Ok {
-		t.Error("slice should  be equal true")
+		t.Error("slice should be true")
 	}
 	}
 }
 }
 
 
@@ -217,3 +217,30 @@ func TestBase64(t *testing.T) {
 		t.Error("\"c3VjaHVhbmdqaUBnbWFpbC5jb20=\" are a valid base64 characters should be true")
 		t.Error("\"c3VjaHVhbmdqaUBnbWFpbC5jb20=\" are a valid base64 characters should be true")
 	}
 	}
 }
 }
+
+func TestValid(t *testing.T) {
+	type user struct {
+		Id   int
+		Name string `valid:"Required"`
+		Age  int    `valid:"Required;Range(1, 140)"`
+	}
+	valid := Validation{}
+
+	u := user{Name: "test", Age: 40}
+	b, err := valid.Valid(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !b {
+		t.Error("validation should be passed")
+	}
+
+	uptr := &user{Name: "test", Age: 180}
+	b, err = valid.Valid(uptr)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if b {
+		t.Error("validation should not be passed")
+	}
+}

@@ -63,7 +63,7 @@ func (m Min) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (m Min) DefaultMessage() string {
 func (m Min) DefaultMessage() string {
-	return fmt.Sprintln("Minimum is", m.Min)
+	return fmt.Sprint("Minimum is ", m.Min)
 }
 }
 
 
 func (m Min) GetKey() string {
 func (m Min) GetKey() string {
@@ -84,7 +84,7 @@ func (m Max) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (m Max) DefaultMessage() string {
 func (m Max) DefaultMessage() string {
-	return fmt.Sprintln("Maximum is", m.Max)
+	return fmt.Sprint("Maximum is ", m.Max)
 }
 }
 
 
 func (m Max) GetKey() string {
 func (m Max) GetKey() string {
@@ -103,7 +103,7 @@ func (r Range) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (r Range) DefaultMessage() string {
 func (r Range) DefaultMessage() string {
-	return fmt.Sprintln("Range is", r.Min.Min, "to", r.Max.Max)
+	return fmt.Sprint("Range is ", r.Min.Min, " to ", r.Max.Max)
 }
 }
 
 
 func (r Range) GetKey() string {
 func (r Range) GetKey() string {
@@ -128,7 +128,7 @@ func (m MinSize) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (m MinSize) DefaultMessage() string {
 func (m MinSize) DefaultMessage() string {
-	return fmt.Sprintln("Minimum size is", m.Min)
+	return fmt.Sprint("Minimum size is ", m.Min)
 }
 }
 
 
 func (m MinSize) GetKey() string {
 func (m MinSize) GetKey() string {
@@ -153,7 +153,7 @@ func (m MaxSize) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (m MaxSize) DefaultMessage() string {
 func (m MaxSize) DefaultMessage() string {
-	return fmt.Sprintln("Maximum size is", m.Max)
+	return fmt.Sprint("Maximum size is ", m.Max)
 }
 }
 
 
 func (m MaxSize) GetKey() string {
 func (m MaxSize) GetKey() string {
@@ -178,7 +178,7 @@ func (l Length) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (l Length) DefaultMessage() string {
 func (l Length) DefaultMessage() string {
-	return fmt.Sprintln("Required length is", l.N)
+	return fmt.Sprint("Required length is ", l.N)
 }
 }
 
 
 func (l Length) GetKey() string {
 func (l Length) GetKey() string {
@@ -202,7 +202,7 @@ func (a Alpha) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (a Alpha) DefaultMessage() string {
 func (a Alpha) DefaultMessage() string {
-	return fmt.Sprintln("Must be valid alpha characters")
+	return fmt.Sprint("Must be valid alpha characters")
 }
 }
 
 
 func (a Alpha) GetKey() string {
 func (a Alpha) GetKey() string {
@@ -226,7 +226,7 @@ func (n Numeric) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (n Numeric) DefaultMessage() string {
 func (n Numeric) DefaultMessage() string {
-	return fmt.Sprintln("Must be valid numeric characters")
+	return fmt.Sprint("Must be valid numeric characters")
 }
 }
 
 
 func (n Numeric) GetKey() string {
 func (n Numeric) GetKey() string {
@@ -250,7 +250,7 @@ func (a AlphaNumeric) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (a AlphaNumeric) DefaultMessage() string {
 func (a AlphaNumeric) DefaultMessage() string {
-	return fmt.Sprintln("Must be valid alpha or numeric characters")
+	return fmt.Sprint("Must be valid alpha or numeric characters")
 }
 }
 
 
 func (a AlphaNumeric) GetKey() string {
 func (a AlphaNumeric) GetKey() string {
@@ -269,7 +269,7 @@ func (m Match) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (m Match) DefaultMessage() string {
 func (m Match) DefaultMessage() string {
-	return fmt.Sprintln("Must match", m.Regexp)
+	return fmt.Sprint("Must match ", m.Regexp)
 }
 }
 
 
 func (m Match) GetKey() string {
 func (m Match) GetKey() string {
@@ -287,7 +287,7 @@ func (n NoMatch) IsSatisfied(obj interface{}) bool {
 }
 }
 
 
 func (n NoMatch) DefaultMessage() string {
 func (n NoMatch) DefaultMessage() string {
-	return fmt.Sprintln("Must not match", n.Regexp)
+	return fmt.Sprint("Must not match ", n.Regexp)
 }
 }
 
 
 func (n NoMatch) GetKey() string {
 func (n NoMatch) GetKey() string {
@@ -302,7 +302,7 @@ type AlphaDash struct {
 }
 }
 
 
 func (a AlphaDash) DefaultMessage() string {
 func (a AlphaDash) DefaultMessage() string {
-	return fmt.Sprintln("Must be valid alpha or numeric or dash(-_) characters")
+	return fmt.Sprint("Must be valid alpha or numeric or dash(-_) characters")
 }
 }
 
 
 func (a AlphaDash) GetKey() string {
 func (a AlphaDash) GetKey() string {
@@ -317,7 +317,7 @@ type Email struct {
 }
 }
 
 
 func (e Email) DefaultMessage() string {
 func (e Email) DefaultMessage() string {
-	return fmt.Sprintln("Must be a valid email address")
+	return fmt.Sprint("Must be a valid email address")
 }
 }
 
 
 func (e Email) GetKey() string {
 func (e Email) GetKey() string {
@@ -332,7 +332,7 @@ type IP struct {
 }
 }
 
 
 func (i IP) DefaultMessage() string {
 func (i IP) DefaultMessage() string {
-	return fmt.Sprintln("Must be a valid ip address")
+	return fmt.Sprint("Must be a valid ip address")
 }
 }
 
 
 func (i IP) GetKey() string {
 func (i IP) GetKey() string {
@@ -347,7 +347,7 @@ type Base64 struct {
 }
 }
 
 
 func (b Base64) DefaultMessage() string {
 func (b Base64) DefaultMessage() string {
-	return fmt.Sprintln("Must be valid base64 characters")
+	return fmt.Sprint("Must be valid base64 characters")
 }
 }
 
 
 func (b Base64) GetKey() string {
 func (b Base64) GetKey() string {