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whatsapp.go
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whatsapp.go
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package whatsapp
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strconv"
"time"
"github.com/buger/jsonparser"
"github.com/nyaruka/courier"
"github.com/nyaruka/courier/handlers"
"github.com/nyaruka/courier/utils"
"github.com/nyaruka/gocommon/urns"
"github.com/pkg/errors"
)
func init() {
courier.RegisterHandler(NewHandler())
}
type handler struct {
handlers.BaseHandler
}
// NewHandler returns a new WhatsApp ready to be registered
func NewHandler() courier.ChannelHandler {
return &handler{handlers.NewBaseHandler(courier.ChannelType("WA"), "WhatsApp")}
}
// 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.UpdateStatus)
}
// {
// "meta": null,
// "payload": {
// "from": "16315555555",
// "message_id": "345b5e14775782",
// "timestamp": "1476225801",
// "message": {
// "address": "1 Hacker Way, Menlo Park, CA 94025",
// "latitude": 37.483253479003906,
// "longitude": -122.14960479736328,
// "has_media": true,
// "text": "This is the media caption.",
// "type": "image"
// }
// },
// "error": false
// }
type waReceive struct {
Payload struct {
From string `json:"from" validate:"required"`
MessageID string `json:"message_id" validate:"required"`
Timestamp string `json:"timestamp" validate:"required"`
Message struct {
HasMedia bool `json:"has_media"`
Address string `json:"address"`
Latitude float64 `json:"latitude"`
Longitude float64 `json:"longitude"`
Text string `json:"text"`
Type string `json:"type" validate:"required"`
} `json:"message" validate:"required"`
} `json:"payload"`
Error bool `json:"error"`
}
// 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) {
waReceive := &waReceive{}
err := handlers.DecodeAndValidateJSON(waReceive, r)
if err != nil {
return nil, courier.WriteError(ctx, w, r, err)
}
// if this is an error, that's an erro
if waReceive.Error {
return nil, courier.WriteError(ctx, w, r, fmt.Errorf("received errored message"))
}
// create our date from the timestamp
ts, err := strconv.ParseInt(waReceive.Payload.Timestamp, 10, 64)
if err != nil {
return nil, courier.WriteError(ctx, w, r, fmt.Errorf("invalid timestamp: %s", waReceive.Payload.Timestamp))
}
date := time.Unix(ts, 0).UTC()
// create our URN
urn, err := urns.NewWhatsAppURN(waReceive.Payload.From)
if err != nil {
return nil, courier.WriteError(ctx, w, r, err)
}
// ignore this if there's no message
if waReceive.Payload.Message.Text == "" {
return nil, courier.WriteAndLogRequestIgnored(ctx, w, r, channel, "ignoring, empty message")
}
// TODO: should we be hitting the API to look up contact information?
// TODO: deal with media messages
// TODO: deal with location messages
// build our msg
msg := h.Backend().NewIncomingMsg(channel, urn, waReceive.Payload.Message.Text).WithReceivedOn(date).WithExternalID(waReceive.Payload.MessageID)
// 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})
}
// {
// "meta": null,
// "payload": {
// "message_id": "157b5e14568e8",
// "to": "16315555555",
// "timestamp": "1476225801",
// "message_status": "read"
// },
// "error": false
// }
type waStatus struct {
Payload struct {
MessageID string `json:"message_id" validate:"required"`
To string `json:"to" validate:"required"`
Timestamp string `json:"timestamp" validate:"required"`
MessageStatus string `json:"message_status" validate:"required"`
} `json:"payload"`
}
var waStatusMapping = map[string]courier.MsgStatusValue{
"sending": courier.MsgWired,
"sent": courier.MsgSent,
"delivered": courier.MsgDelivered,
"read": courier.MsgDelivered,
"failed": courier.MsgFailed,
}
// UpdateStatus is our HTTP handler function for status updates
func (h *handler) UpdateStatus(ctx context.Context, channel courier.Channel, w http.ResponseWriter, r *http.Request) ([]courier.Event, error) {
// get our params
waStatus := &waStatus{}
err := handlers.DecodeAndValidateJSON(waStatus, r)
if err != nil {
return nil, courier.WriteError(ctx, w, r, err)
}
msgStatus, found := waStatusMapping[waStatus.Payload.MessageStatus]
if !found {
return nil, courier.WriteError(
ctx, w, r,
fmt.Errorf("unknown status '%s', must be one of 'sending', 'sent', 'delivered', 'read' or 'failed'", waStatus.Payload.MessageStatus))
}
// if we have no status, then build it from the external (twilio) id
status := h.Backend().NewMsgStatusForExternalID(channel, waStatus.Payload.MessageID, msgStatus)
// write our status
err = h.Backend().WriteMsgStatus(ctx, status)
if err != nil {
return nil, err
}
return []courier.Event{status}, courier.WriteStatusSuccess(ctx, w, r, []courier.MsgStatus{status})
}
// {
// "payload": {
// "to": "16315555555",
// "body": "hello world"
// }
// }
type waPayload struct {
To string `json:"to" validate:"required"`
Body string `json:"body" validate:"required"`
}
// {
// "payload": {
// "message_id": "1015511",
// },
// "error": false
// }
type waSendResponse struct {
Payload struct {
MessageID string `json:"message_id" validate:"required"`
} `json:"payload"`
Error bool `json:"error"`
}
// whatsapp only allows messages up to 4096 chars
const maxMsgLength = 4096
// SendMsg sends the passed in message, returning any error
func (h *handler) SendMsg(ctx context.Context, msg courier.Msg) (courier.MsgStatus, error) {
// get our username and password
username := msg.Channel().StringConfigForKey(courier.ConfigUsername, "")
if username == "" {
return nil, fmt.Errorf("no username set for WA channel")
}
password := msg.Channel().StringConfigForKey(courier.ConfigPassword, "")
if password == "" {
return nil, fmt.Errorf("no password set for WA channel")
}
urlStr := msg.Channel().StringConfigForKey(courier.ConfigBaseURL, "")
if urlStr == "" {
return nil, fmt.Errorf("no base url set for WA channel")
}
url, err := url.Parse(urlStr)
if err != nil {
return nil, fmt.Errorf("invalid base url set for WA channel: %s", err)
}
sendPath, _ := url.Parse("/api/rest_send.php")
sendURL := url.ResolveReference(sendPath).String()
// TODO: figure out sending media
status := h.Backend().NewMsgStatusForID(msg.Channel(), msg.ID(), courier.MsgErrored)
parts := handlers.SplitMsg(msg.Text(), maxMsgLength)
for i, part := range parts {
payload := waPayload{
To: msg.URN().Path(),
Body: part,
}
body := map[string]interface{}{"payload": payload}
jsonBody, err := json.Marshal(body)
if err != nil {
return status, err
}
req, err := http.NewRequest(http.MethodPost, sendURL, bytes.NewReader(jsonBody))
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "application/json")
req.SetBasicAuth(username, password)
rr, err := utils.MakeHTTPRequest(req)
// record our status and log
log := courier.NewChannelLogFromRR("Message Sent", msg.Channel(), msg.ID(), rr).WithError("Message Send Error", err)
status.AddLog(log)
if err != nil {
return status, nil
}
// was this an error?
wasError, err := jsonparser.GetBoolean([]byte(rr.Body), "error")
if err != nil || wasError {
log.WithError("Message Send Error", errors.Errorf("received error from send endpoint"))
return status, nil
}
// grab the id
externalID, err := jsonparser.GetString([]byte(rr.Body), "payload", "message_id")
if err != nil {
log.WithError("Message Send Error", errors.Errorf("unable to get message_id from body"))
return status, nil
}
// if this is our first message, record the external id
if i == 0 {
status.SetExternalID(externalID)
}
// this was wired successfully
status.SetStatus(courier.MsgWired)
}
return status, nil
}