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africastalking.go
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africastalking.go
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package africastalking
import (
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/buger/jsonparser"
"github.com/nyaruka/courier"
"github.com/nyaruka/courier/handlers"
"github.com/nyaruka/courier/utils"
"github.com/pkg/errors"
)
const configIsShared = "is_shared"
var sendURL = "https://api.africastalking.com/version1/messaging"
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.MsgStatusValue{
"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)
err := s.AddReceiveMsgRoute(h, "POST", "receive", h.ReceiveMessage)
if err != nil {
return err
}
return s.AddUpdateStatusRoute(h, "POST", "status", h.StatusMessage)
}
// ReceiveMessage is our HTTP handler function for incoming messages
func (h *handler) ReceiveMessage(channel courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.ReceiveEvent, error) {
// get our params
atMsg := &messageRequest{}
err := handlers.DecodeAndValidateForm(atMsg, r)
if err != nil {
return nil, 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 nil, fmt.Errorf("invalid date format: %s", atMsg.Date)
}
// create our URN
urn := courier.NewTelURNForChannel(atMsg.From, channel)
// build our msg
msg := h.Backend().NewIncomingMsg(channel, urn, atMsg.Text).WithExternalID(atMsg.ID).WithReceivedOn(date)
// and finally queue our message
err = h.Backend().WriteMsg(msg)
if err != nil {
return nil, err
}
return []courier.ReceiveEvent{msg}, courier.WriteMsgSuccess(w, r, msg)
}
// StatusMessage is our HTTP handler function for status updates
func (h *handler) StatusMessage(channel courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.MsgStatus, error) {
// get our params
atStatus := &statusRequest{}
err := handlers.DecodeAndValidateForm(atStatus, r)
if err != nil {
return nil, err
}
msgStatus, found := statusMapping[atStatus.Status]
if !found {
return nil, fmt.Errorf("unknown status '%s', must be one of 'Success','Sent','Buffered','Rejected' or 'Failed'", atStatus.Status)
}
// write our status
status := h.Backend().NewMsgStatusForExternalID(channel, atStatus.ID, msgStatus)
err = h.Backend().WriteMsgStatus(status)
if err != nil {
return nil, err
}
return []courier.MsgStatus{status}, courier.WriteStatusSuccess(w, r, status)
}
// SendMsg sends the passed in message, returning any error
func (h *handler) SendMsg(msg courier.Msg) (courier.MsgStatus, error) {
isSharedStr := msg.Channel().ConfigForKey(configIsShared, false)
isShared, _ := isSharedStr.(bool)
username := msg.Channel().StringConfigForKey(courier.ConfigUsername, "")
if username == "" {
return nil, fmt.Errorf("no username set for AT channel")
}
apiKey := msg.Channel().StringConfigForKey(courier.ConfigAPIKey, "")
if apiKey == "" {
return nil, fmt.Errorf("no API key set for AT channel")
}
// build our request
form := url.Values{
"username": []string{username},
"to": []string{msg.URN().Path()},
"message": []string{courier.GetTextAndAttachments(msg)},
}
// if this isn't shared, include our from
if !isShared {
form["from"] = []string{msg.Channel().Address()}
}
req, err := http.NewRequest(http.MethodPost, sendURL, strings.NewReader(form.Encode()))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("Accept", "application/json")
req.Header.Set("apikey", apiKey)
rr, err := utils.MakeHTTPRequest(req)
// record our status and log
status := h.Backend().NewMsgStatusForID(msg.Channel(), msg.ID(), courier.MsgErrored)
status.AddLog(courier.NewChannelLogFromRR("Message Sent", msg.Channel(), msg.ID(), rr).WithError("Message Send Error", err))
if err != nil {
return status, nil
}
// was this request successful?
msgStatus, _ := jsonparser.GetString([]byte(rr.Body), "SMSMessageData", "Recipients", "[0]", "status")
if msgStatus != "Success" {
return status, errors.Errorf("received non-success status '%s'", msgStatus)
}
// grab the external id if we can
externalID, _ := jsonparser.GetString([]byte(rr.Body), "SMSMessageData", "Recipients", "[0]", "messageId")
status.SetStatus(courier.MsgWired)
status.SetExternalID(externalID)
return status, nil
}