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message.go
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message.go
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package token
import (
"bytes"
"fmt"
"html/template"
)
type MessageBuilder interface {
GetMessage(token *CodeToken) (string, error)
}
type SimpleMessage struct{}
func (mb *SimpleMessage) GetMessage(token *CodeToken) (string, error) {
return fmt.Sprintf("Code: %v", token.Value), nil
}
type HTMLTemplateMessage struct {
Tmplt *template.Template
MapToken func(token *CodeToken) interface{}
}
func NewHTMLMessageBuilder(templatePath string, mapTokenFunc func(token *CodeToken) interface{}) (*HTMLTemplateMessage, error) {
tmplt, err := template.ParseFiles(templatePath)
if err != nil {
return nil, err
}
err = testTemplate(tmplt, mapTokenFunc)
if err != nil {
return nil, err
}
return &HTMLTemplateMessage{
Tmplt: tmplt,
MapToken: mapTokenFunc,
}, nil
}
func (mb *HTMLTemplateMessage) GetMessage(token *CodeToken) (string, error) {
buf := bytes.NewBufferString("")
err := mb.Tmplt.Execute(buf, mb.MapToken(token))
if err != nil {
return "", err
}
return buf.String(), nil
}
func testTemplate(tmplt *template.Template, mapTokenFunc func(token *CodeToken) interface{}) error {
tmpToken := CodeToken{}
buf := bytes.NewBufferString("")
err := tmplt.Execute(buf, mapTokenFunc(&tmpToken))
if err != nil {
return fmt.Errorf("error testing template during initialization: %w", err)
}
return nil
}