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jasmin.go
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jasmin.go
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package jasmin
import (
"context"
"fmt"
"net/http"
"net/url"
"regexp"
"time"
"github.com/nyaruka/courier/gsm7"
"strings"
"github.com/nyaruka/courier"
"github.com/nyaruka/courier/handlers"
"github.com/nyaruka/courier/utils"
"github.com/nyaruka/gocommon/urns"
)
var idRegex = regexp.MustCompile(`Success \"(.*)\"`)
func init() {
courier.RegisterHandler(newHandler())
}
type handler struct {
handlers.BaseHandler
}
func newHandler() courier.ChannelHandler {
return &handler{handlers.NewBaseHandler(courier.ChannelType("JS"), "Jasmin")}
}
// Initialize is called by the engine once everything is loaded
func (h *handler) Initialize(s courier.Server) error {
h.SetServer(s)
err := s.AddHandlerRoute(h, http.MethodPost, "receive", h.ReceiveMessage)
if err != nil {
return err
}
return s.AddHandlerRoute(h, http.MethodPost, "status", h.ReceiveStatus)
}
type statusRequest struct {
ID string `name:"id" validate:"required"`
Delivered int `name:"dlvrd"`
Err int `name:"err"`
}
// ReceiveStatus is our HTTP handler function for status updates
func (h *handler) ReceiveStatus(ctx context.Context, c courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.Event, error) {
req := &statusRequest{}
err := handlers.DecodeAndValidateForm(req, r)
if err != nil {
return nil, courier.WriteAndLogRequestError(ctx, w, r, c, err)
}
// should have either delivered or err
reqStatus := courier.NilMsgStatus
if req.Delivered == 1 {
reqStatus = courier.MsgDelivered
} else if req.Err == 1 {
reqStatus = courier.MsgFailed
} else {
return nil, courier.WriteAndLogRequestError(ctx, w, r, c, fmt.Errorf("must have either dlvrd or err set to 1"))
}
status := h.Backend().NewMsgStatusForExternalID(c, req.ID, reqStatus)
err = h.Backend().WriteMsgStatus(ctx, status)
if err == courier.ErrMsgNotFound {
return nil, writeJasminACK(w)
}
if err != nil {
return nil, err
}
return []courier.Event{status}, writeJasminACK(w)
}
type moRequest struct {
Content string `name:"content"`
Coding string `name:"coding" validate:"required"`
From string `name:"from" validate:"required"`
To string `name:"to" validate:"required"`
ID string `name:"id" validate:"required"`
}
// ReceiveMessage is our HTTP handler function for incoming messages
func (h *handler) ReceiveMessage(ctx context.Context, c courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.Event, error) {
// get our params
req := &moRequest{}
err := handlers.DecodeAndValidateForm(req, r)
if err != nil {
return nil, courier.WriteAndLogRequestError(ctx, w, r, c, err)
}
// create our URN
urn := urns.NewTelURNForCountry(req.From, c.Country())
// Decode from GSM7 if required
text := string(req.Content)
if req.Coding == "0" {
text = gsm7.Decode([]byte(req.Content))
}
// build our msg
msg := h.Backend().NewIncomingMsg(c, urn, text).WithExternalID(req.ID).WithReceivedOn(time.Now().UTC())
// and finally queue our message
err = h.Backend().WriteMsg(ctx, msg)
if err != nil {
return nil, err
}
return []courier.Event{msg}, writeJasminACK(w)
}
func writeJasminACK(w http.ResponseWriter) error {
w.WriteHeader(200)
_, err := fmt.Fprint(w, "ACK/Jasmin")
return err
}
// 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 JS channel")
}
password := msg.Channel().StringConfigForKey(courier.ConfigPassword, "")
if password == "" {
return nil, fmt.Errorf("no password set for JS channel")
}
sendURL := msg.Channel().StringConfigForKey(courier.ConfigSendURL, "")
if sendURL == "" {
return nil, fmt.Errorf("no send url set for JS channel")
}
callbackDomain := msg.Channel().CallbackDomain(h.Server().Config().Domain)
dlrURL := fmt.Sprintf("https://%s/c/js/%s/status", callbackDomain, msg.Channel().UUID())
// build our request
form := url.Values{
"username": []string{username},
"password": []string{password},
"from": []string{strings.TrimPrefix(msg.Channel().Address(), "+")},
"to": []string{strings.TrimPrefix(msg.URN().Path(), "+")},
"dlr": []string{"yes"},
"dlr-url": []string{dlrURL},
"dlr-level": []string{"2"},
"dlr-method": []string{"POST"},
"coding": []string{"0"},
"content": []string{string(gsm7.Encode(gsm7.ReplaceSubstitutions(handlers.GetTextAndAttachments(msg))))},
}
fullURL, _ := url.Parse(sendURL)
fullURL.RawQuery = form.Encode()
req, _ := http.NewRequest(http.MethodGet, fullURL.String(), nil)
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 {
status.SetStatus(courier.MsgWired)
}
// try to read our external id out
matches := idRegex.FindStringSubmatch(string(rr.Body))
if len(matches) == 2 {
status.SetExternalID(matches[1])
}
return status, nil
}