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welcomeMessage.go
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/
welcomeMessage.go
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package messengerbot
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
)
type ctaBase struct {
SettingType string `json:"setting_type"`
ThreadState string `json:"thread_state"`
}
var welcomeMessage = ctaBase{
SettingType: "setting_type",
ThreadState: "new_thread",
}
type cta struct {
ctaBase
CallToActions []*Message `json:"call_to_actions"`
}
type result struct {
Result string `json:"result"`
}
// SetWelcomeMessage sets the message that is sent first. If message is nil or empty the welcome message is not sent.
func (bot *MessengerBot) SetWelcomeMessage(message *Message) error {
cta := &cta{
ctaBase: welcomeMessage,
CallToActions: []*Message{message},
}
if bot.PageId == "" {
return errors.New("PageId is empty")
}
byt, err := json.Marshal(cta)
if err != nil {
return err
}
request, _ := http.NewRequest("POST", fmt.Sprintf(GraphAPI+"%s/thread_settings", bot.PageId), bytes.NewReader(byt))
request.Header.Set("Content-Type", "application/json")
response, err := bot.Client.Do(request)
if response != nil {
defer response.Body.Close()
}
if err != nil {
return err
}
if response.StatusCode != http.StatusOK {
return errors.New("Invalid status code")
}
decoder := json.NewDecoder(response.Body)
result := &result{}
err = decoder.Decode(result)
if err != nil {
return err
}
if result.Result != "Successfully added new_thread's CTAs" {
return errors.New("Something went wrong with setting thread's welcome message, facebook error: " + result.Result)
}
return nil
}