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chikka.go
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chikka.go
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package chikka
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/nyaruka/courier/utils"
"github.com/nyaruka/courier"
"github.com/nyaruka/courier/handlers"
"github.com/nyaruka/gocommon/urns"
)
var (
sendURL = "https://post.chikka.com/smsapi/request"
maxMsgLength = 160
)
type handler struct {
handlers.BaseHandler
}
func newHandler() courier.ChannelHandler {
return &handler{handlers.NewBaseHandler(courier.ChannelType("CK"), "Chikka")}
}
func init() {
courier.RegisterHandler(newHandler())
}
// Initialize is called by the engine once everything is loaded
func (h *handler) Initialize(s courier.Server) error {
h.SetServer(s)
return s.AddHandlerRoute(h, http.MethodPost, "receive", h.ReceiveMessage)
}
type moForm struct {
RequestID string `name:"request_id" validate:"required"`
MobileNumber string `name:"mobile_number" validate:"required"`
Message string `name:"message"`
Timestamp float64 `name:"timestamp" validate:"required"`
}
type statusForm struct {
MessageID int64 `name:"message_id" validate:"required"`
Status string `name:"status" validate:"required"`
}
var statusMapping = map[string]courier.MsgStatusValue{
"SENT": courier.MsgSent,
"FAILED": courier.MsgFailed,
}
// ReceiveMessage is our HTTP handler function for incoming messages
func (h *handler) ReceiveMessage(ctx context.Context, channel courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.Event, error) {
err := r.ParseForm()
if err != nil {
return nil, courier.WriteAndLogRequestError(ctx, w, r, channel, err)
}
messageType := r.Form.Get("message_type")
if messageType == "outgoing" {
form := &statusForm{}
err := handlers.DecodeAndValidateForm(form, r)
if err != nil {
return nil, courier.WriteAndLogRequestError(ctx, w, r, channel, err)
}
msgStatus, found := statusMapping[form.Status]
if !found {
return nil, courier.WriteAndLogRequestError(ctx, w, r, channel, fmt.Errorf(`unknown status '%s', must be either 'SENT' or 'FAILED'`, form.Status))
}
// write our status
status := h.Backend().NewMsgStatusForID(channel, courier.NewMsgID(form.MessageID), msgStatus)
err = h.Backend().WriteMsgStatus(ctx, status)
if err == courier.ErrMsgNotFound {
return nil, courier.WriteAndLogStatusMsgNotFound(ctx, w, r, channel)
}
if err != nil {
return nil, err
}
return []courier.Event{status}, courier.WriteStatusSuccess(ctx, w, r, []courier.MsgStatus{status})
} else if messageType == "incoming" {
form := &moForm{}
err := handlers.DecodeAndValidateForm(form, r)
if err != nil {
return nil, courier.WriteAndLogRequestError(ctx, w, r, channel, err)
}
// create our date from the timestamp
date := time.Unix(0, int64(form.Timestamp*1000000000)).UTC()
// create our URN
urn := urns.NewTelURNForCountry(form.MobileNumber, channel.Country())
// build our msg
msg := h.Backend().NewIncomingMsg(channel, urn, form.Message).WithExternalID(form.RequestID).WithReceivedOn(date)
// and finally queue our message
err = h.Backend().WriteMsg(ctx, msg)
if err != nil {
return nil, err
}
return []courier.Event{msg}, courier.WriteMsgSuccess(ctx, w, r, []courier.Msg{msg})
} else {
return nil, courier.WriteAndLogRequestIgnored(ctx, w, r, channel, "unknown message_type request")
}
}
// SendMsg sends the passed in message, returning any error
func (h *handler) SendMsg(ctx context.Context, msg courier.Msg) (courier.MsgStatus, error) {
username := msg.Channel().StringConfigForKey(courier.ConfigUsername, "")
if username == "" {
return nil, fmt.Errorf("no username set for CK channel")
}
password := msg.Channel().StringConfigForKey(courier.ConfigPassword, "")
if password == "" {
return nil, fmt.Errorf("no password set for CK channel")
}
status := h.Backend().NewMsgStatusForID(msg.Channel(), msg.ID(), courier.MsgErrored)
parts := handlers.SplitMsg(handlers.GetTextAndAttachments(msg), maxMsgLength)
for _, part := range parts {
// build our request
form := url.Values{
"message_type": []string{"SEND"},
"mobile_number": []string{strings.TrimLeft(msg.URN().Path(), "+")},
"shortcode": []string{strings.TrimLeft(msg.Channel().Address(), "+")},
"message_id": []string{msg.ID().String()},
"message": []string{part},
"request_cost": []string{"FREE"},
"client_id": []string{username},
"secret_key": []string{password},
}
if !msg.ResponseToID().IsZero() {
form["message_type"] = []string{"REPLY"}
form["request_id"] = []string{msg.ResponseToID().String()}
}
req, _ := http.NewRequest(http.MethodPost, sendURL, strings.NewReader(form.Encode()))
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
rr, err := utils.MakeHTTPRequest(req)
// record our status and log
status.AddLog(courier.NewChannelLogFromRR("Message Sent", msg.Channel(), msg.ID(), rr).WithError("Message Send Error", err))
if err != nil {
return status, nil
}
status.SetStatus(courier.MsgWired)
}
return status, nil
}