/
server.go
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/
server.go
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package mocktwilio
import (
"encoding/json"
"fmt"
"io"
"math/rand"
"net/http"
"net/url"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/pkg/errors"
"github.com/target/goalert/notification/twilio"
"github.com/target/goalert/validation/validate"
)
// Config is used to configure the mock server.
type Config struct {
// The SID and token should match values given to the backend
// as the mock server will send and validate signatures.
AccountSID string
AuthToken string
// MinQueueTime determines the minimum amount of time an SMS or voice
// call will sit in the queue before being processed/delivered.
MinQueueTime time.Duration
}
// Server implements the Twilio API for SMS and Voice calls
// via the http.Handler interface.
type Server struct {
mx sync.RWMutex
callbacks map[string]string
smsInCh chan *SMS
callInCh chan *VoiceCall
smsCh chan *SMS
callCh chan *VoiceCall
errs chan error
cfg Config
messages map[string]*SMS
calls map[string]*VoiceCall
msgSvc map[string][]string
mux *http.ServeMux
shutdown chan struct{}
sidSeq uint64
workers sync.WaitGroup
carrierInfo map[string]twilio.CarrierInfo
carrierInfoMx sync.Mutex
}
// NewServer creates a new Server.
func NewServer(cfg Config) *Server {
if cfg.MinQueueTime == 0 {
cfg.MinQueueTime = 100 * time.Millisecond
}
s := &Server{
cfg: cfg,
callbacks: make(map[string]string),
mux: http.NewServeMux(),
messages: make(map[string]*SMS),
calls: make(map[string]*VoiceCall),
msgSvc: make(map[string][]string),
smsCh: make(chan *SMS),
smsInCh: make(chan *SMS),
callCh: make(chan *VoiceCall),
callInCh: make(chan *VoiceCall),
errs: make(chan error, 10000),
shutdown: make(chan struct{}),
carrierInfo: make(map[string]twilio.CarrierInfo),
}
base := "/2010-04-01/Accounts/" + cfg.AccountSID
s.mux.HandleFunc(base+"/Calls.json", s.serveNewCall)
s.mux.HandleFunc(base+"/Messages.json", s.serveNewMessage)
s.mux.HandleFunc(base+"/Calls/", s.serveCallStatus)
s.mux.HandleFunc(base+"/Messages/", s.serveMessageStatus)
s.mux.HandleFunc("/v1/PhoneNumbers/", s.serveLookup)
s.workers.Add(1)
go s.loop()
return s
}
// Errors returns a channel that gets fed all errors when calling
// the backend.
func (s *Server) Errors() chan error {
return s.errs
}
func (s *Server) post(url string, v url.Values) ([]byte, error) {
req, err := http.NewRequest("POST", url, strings.NewReader(v.Encode()))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
req.Header.Set("X-Twilio-Signature", string(twilio.Signature(s.cfg.AuthToken, url, v)))
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode/100 != 2 {
return nil, errors.Errorf("non-2xx response: %s", resp.Status)
}
defer resp.Body.Close()
data, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
if len(data) == 0 && resp.StatusCode != 204 {
return nil, errors.Errorf("non-204 response on empty body: %s", resp.Status)
}
return data, nil
}
func (s *Server) id(prefix string) string {
return fmt.Sprintf("%s%032d", prefix, atomic.AddUint64(&s.sidSeq, 1))
}
// Close will shutdown the server loop.
func (s *Server) Close() error {
close(s.shutdown)
s.workers.Wait()
return nil
}
// wait will wait the specified amount of time, but return
// true if aborted due to shutdown.
func (s *Server) wait(dur time.Duration) bool {
t := time.NewTimer(dur)
defer t.Stop()
select {
case <-t.C:
return false
case <-s.shutdown:
return true
}
}
func (s *Server) loop() {
defer s.workers.Done()
for {
select {
case <-s.shutdown:
return
default:
}
select {
case <-s.shutdown:
return
case sms := <-s.smsInCh:
s.workers.Add(1)
go sms.process()
case vc := <-s.callInCh:
s.workers.Add(1)
go vc.process()
}
}
}
func apiError(status int, w http.ResponseWriter, e *twilio.Exception) {
w.WriteHeader(status)
err := json.NewEncoder(w).Encode(e)
if err != nil {
panic(err)
}
}
// ServeHTTP implements the http.Handler interface for serving [mock] API requests.
func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
s.mux.ServeHTTP(w, req)
}
// SetCarrierInfo will set/update the carrier info (used for the Lookup API) for the given number.
func (s *Server) SetCarrierInfo(number string, info twilio.CarrierInfo) {
s.carrierInfoMx.Lock()
defer s.carrierInfoMx.Unlock()
s.carrierInfo[number] = info
}
// getFromNumber will return a random number from the messaging service if ID is a
// messaging SID, or the value itself otherwise.
func (s *Server) getFromNumber(id string) string {
if !strings.HasPrefix(id, "MG") {
return id
}
s.mx.Lock()
defer s.mx.Unlock()
// select a random number from the message service
if len(s.msgSvc[id]) == 0 {
return ""
}
return s.msgSvc[id][rand.Intn(len(s.msgSvc[id]))]
}
// NewMessagingService registers a new Messaging SID for the given numbers.
func (s *Server) NewMessagingService(url string, numbers ...string) (string, error) {
err := validate.URL("URL", url)
for i, n := range numbers {
err = validate.Many(err, validate.Phone(fmt.Sprintf("Number[%d]", i), n))
}
if err != nil {
return "", err
}
svcID := s.id("MG")
s.mx.Lock()
defer s.mx.Unlock()
for _, num := range numbers {
s.callbacks["SMS:"+num] = url
}
s.msgSvc[svcID] = numbers
return svcID, nil
}
// RegisterSMSCallback will set/update a callback URL for SMS calls made to the given number.
func (s *Server) RegisterSMSCallback(number, url string) error {
err := validate.URL("URL", url)
if err != nil {
return err
}
s.mx.Lock()
defer s.mx.Unlock()
s.callbacks["SMS:"+number] = url
return nil
}
// RegisterVoiceCallback will set/update a callback URL for voice calls made to the given number.
func (s *Server) RegisterVoiceCallback(number, url string) error {
err := validate.URL("URL", url)
if err != nil {
return err
}
s.mx.Lock()
defer s.mx.Unlock()
s.callbacks["VOICE:"+number] = url
return nil
}