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handler.go
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handler.go
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package africastalking
import (
"fmt"
"net/http"
"time"
"github.com/nyaruka/courier"
"github.com/nyaruka/courier/handlers"
)
func init() {
courier.RegisterHandler(NewHandler())
}
type handler struct {
handlers.BaseHandler
}
// NewHandler returns a new Africa's Talking handler
func NewHandler() courier.ChannelHandler {
return &handler{handlers.NewBaseHandler(courier.ChannelType("AT"), "Africas Talking")}
}
type messageRequest struct {
ID string `validate:"required" name:"id"`
Text string `validate:"required" name:"text"`
From string `validate:"required" name:"from"`
To string `validate:"required" name:"to"`
Date string `validate:"required" name:"date"`
}
type statusRequest struct {
ID string `validate:"required" name:"id"`
Status string `validate:"required" name:"status"`
}
var statusMapping = map[string]courier.MsgStatus{
"Success": courier.MsgDelivered,
"Sent": courier.MsgSent,
"Buffered": courier.MsgSent,
"Rejected": courier.MsgFailed,
"Failed": courier.MsgFailed,
}
// Initialize is called by the engine once everything is loaded
func (h *handler) Initialize(s courier.Server) error {
h.SetServer(s)
route := s.AddChannelRoute(h, "POST", "receive", h.ReceiveMessage)
if route.GetError() != nil {
return route.GetError()
}
route = s.AddChannelRoute(h, "POST", "status", h.StatusMessage)
return route.GetError()
}
// ReceiveMessage is our HTTP handler function for incoming messages
func (h *handler) ReceiveMessage(channel courier.Channel, w http.ResponseWriter, r *http.Request) error {
// get our params
atMsg := &messageRequest{}
err := handlers.DecodeAndValidateForm(atMsg, r)
if err != nil {
return err
}
// create our date from the timestamp
// 2017-05-03T06:04:45Z
date, err := time.Parse("2006-01-02T15:04:05Z", atMsg.Date)
if err != nil {
return fmt.Errorf("invalid date format: %s", atMsg.Date)
}
// create our URN
urn := courier.NewTelURNForChannel(atMsg.From, channel)
// build our msg
msg := courier.NewIncomingMsg(channel, urn, atMsg.Text).WithExternalID(atMsg.ID).WithReceivedOn(date)
// and finally queue our message
err = h.Server().WriteMsg(msg)
if err != nil {
return err
}
return courier.WriteReceiveSuccess(w, msg)
}
// StatusMessage is our HTTP handler function for status updates
func (h *handler) StatusMessage(channel courier.Channel, w http.ResponseWriter, r *http.Request) error {
// get our params
atStatus := &statusRequest{}
err := handlers.DecodeAndValidateForm(atStatus, r)
if err != nil {
return err
}
msgStatus, found := statusMapping[atStatus.Status]
if !found {
return fmt.Errorf("unknown status '%s', must be one of 'Success','Sent','Buffered','Rejected' or 'Failed'", atStatus.Status)
}
// write our status
status := courier.NewStatusUpdateForExternalID(channel, atStatus.ID, msgStatus)
defer status.Release()
err = h.Server().WriteMsgStatus(status)
if err != nil {
return err
}
return courier.WriteStatusSuccess(w, status)
}