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formbuilder.go
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formbuilder.go
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package formbuilder
import (
"errors"
"fmt"
"os"
"strings"
ncommon "github.com/admpub/nging/v3/application/library/common"
"github.com/coscms/forms"
"github.com/coscms/forms/common"
"github.com/coscms/forms/config"
"github.com/coscms/forms/fields"
"github.com/webx-top/db/lib/factory"
"github.com/webx-top/echo"
"github.com/webx-top/echo/middleware/render/driver"
)
var (
ErrJSONConfigFileNameInvalid = errors.New("*.form.json name invalid")
)
func New(ctx echo.Context, model interface{}, options ...Option) *FormBuilder {
f := &FormBuilder{
Forms: forms.NewForms(forms.New()),
on: MethodHooks{},
ctx: ctx,
}
defaultHooks := []MethodHook{
BindModel(ctx, f),
ValidModel(ctx, f),
}
f.OnPost(defaultHooks...)
f.OnPut(defaultHooks...)
f.SetModel(model)
f.Theme = common.BOOTSTRAP
for _, option := range options {
if option == nil {
continue
}
option(ctx, f)
}
f.SetLabelFunc(func(txt string) string {
return ctx.T(txt)
})
f.AddBeforeRender(func() {
nextURL := ctx.Form(ncommon.DefaultNextURLVarName)
if len(nextURL) > 0 {
f.Elements(fields.HiddenField(ncommon.DefaultNextURLVarName).SetValue(nextURL))
}
})
csrfToken, ok := ctx.Get(`csrf`).(string)
if ok {
f.AddBeforeRender(func() {
f.Elements(fields.HiddenField(`csrf`).SetValue(csrfToken))
})
}
ctx.Set(`forms`, f.Forms)
return f
}
// FormBuilder HTML表单构建器
type FormBuilder struct {
*forms.Forms
on MethodHooks
exit bool
err error
ctx echo.Context
configFile string
dbi *factory.DBI
defaults map[string]string
}
// Exited 是否需要退出后续处理。此时一般有err值,用于记录错误原因
func (f *FormBuilder) Exited() bool {
return f.exit
}
// Exit 设置退出标记
func (f *FormBuilder) Exit(exit ...bool) *FormBuilder {
if len(exit) > 0 && !exit[0] {
f.exit = false
} else {
f.exit = true
}
return f
}
// SetError 记录错误
func (f *FormBuilder) SetError(err error) *FormBuilder {
f.err = err
return f
}
// HasError 是否有错误
func (f *FormBuilder) HasError() bool {
return f.err != nil
}
// Error 返回错误值
func (f *FormBuilder) Error() error {
return f.err
}
// ParseConfigFile 解析配置文件 xxx.form.json
func (f *FormBuilder) ParseConfigFile() error {
jsonFile := f.configFile
var cfg *config.Config
renderer := f.ctx.Renderer().(driver.Driver)
jsonFile += `.form.json`
jsonFile = renderer.TmplPath(f.ctx, jsonFile)
if len(jsonFile) == 0 {
return ErrJSONConfigFileNameInvalid
}
b, err := renderer.RawContent(jsonFile)
if err != nil {
if !os.IsNotExist(err) /* && !strings.Contains(err.Error(), `file does not exist`)*/ || renderer.Manager() == nil {
return fmt.Errorf(`read file %s: %w`, jsonFile, err)
}
cfg = f.ToConfig()
var jsonb []byte
jsonb, err = f.ToJSONBlob(cfg)
if err != nil {
return fmt.Errorf(`[form.ToJSONBlob] %s: %w`, jsonFile, err)
}
err = renderer.Manager().SetTemplate(jsonFile, jsonb)
if err != nil {
return fmt.Errorf(`%s: %w`, jsonFile, err)
}
f.ctx.Logger().Infof(f.ctx.T(`生成表单配置文件“%v”成功。`), jsonFile)
} else {
cfg, err = forms.Unmarshal(b, jsonFile)
if err != nil {
return fmt.Errorf(`[forms.Unmarshal] %s: %w`, jsonFile, err)
}
}
if cfg == nil {
cfg = f.NewConfig()
}
defaultValues := f.DefaultValues()
if defaultValues != nil && len(defaultValues) > 0 {
cfg.SetDefaultValue(func(fieldName string) string {
fieldName = strings.Title(fieldName)
val, _ := defaultValues[fieldName]
return val
})
}
f.Init(cfg)
return err
}
// DefaultValues 获取model结构体各个字段在数据库中的默认值
func (f *FormBuilder) DefaultValues() map[string]string {
if f.defaults != nil {
return f.defaults
}
if f.dbi == nil || f.dbi.Fields == nil {
return nil
}
m, ok := f.Model.(factory.Short)
if !ok {
return nil
}
fields, ok := f.dbi.Fields[m.Short_()]
if !ok || fields == nil {
return nil
}
f.defaults = map[string]string{}
for _, info := range fields {
if len(info.DefaultValue) > 0 {
f.defaults[info.GoName] = info.DefaultValue
}
}
return f.defaults
}
// DefaultValue 查询某个结构体字段在数据库中对应的默认值
func (f *FormBuilder) DefaultValue(fieldName string) string {
defaultValues := f.DefaultValues()
if defaultValues == nil {
return ``
}
fieldName = strings.Title(fieldName)
val, _ := defaultValues[fieldName]
return val
}
// RecvSubmission 接收客户端的提交
func (f *FormBuilder) RecvSubmission() error {
method := strings.ToUpper(f.ctx.Method())
if f.err = f.on.Fire(method); f.err != nil {
return f.err
}
f.err = f.on.Fire(`*`)
if f.ctx.Response().Committed() {
f.exit = true
}
return f.err
}
// Generate 生成表单参数
func (f *FormBuilder) Generate() *FormBuilder {
f.ParseFromConfig()
return f
}
// Snippet 表单片段
func (f *FormBuilder) Snippet() *FormBuilder {
f.Config().Template = common.TmplDir(f.Config().Theme) + `/allfields.html`
return f
}