mirror of
https://github.com/Luzifer/twitch-bot.git
synced 2024-11-14 11:02:43 +00:00
529 lines
16 KiB
Go
529 lines
16 KiB
Go
package twitch
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"crypto/hmac"
|
|
"crypto/sha256"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/gofrs/uuid/v3"
|
|
"github.com/gorilla/mux"
|
|
"github.com/mitchellh/hashstructure/v2"
|
|
"github.com/pkg/errors"
|
|
log "github.com/sirupsen/logrus"
|
|
|
|
"github.com/Luzifer/go_helpers/v2/str"
|
|
)
|
|
|
|
const (
|
|
eventSubHeaderMessageID = "Twitch-Eventsub-Message-Id"
|
|
eventSubHeaderMessageType = "Twitch-Eventsub-Message-Type"
|
|
eventSubHeaderMessageSignature = "Twitch-Eventsub-Message-Signature"
|
|
eventSubHeaderMessageTimestamp = "Twitch-Eventsub-Message-Timestamp"
|
|
// eventSubHeaderMessageRetry = "Twitch-Eventsub-Message-Retry"
|
|
// eventSubHeaderSubscriptionType = "Twitch-Eventsub-Subscription-Type"
|
|
// eventSubHeaderSubscriptionVersion = "Twitch-Eventsub-Subscription-Version"
|
|
|
|
eventSubMessageTypeVerification = "webhook_callback_verification"
|
|
eventSubMessageTypeRevokation = "revocation"
|
|
// eventSubMessageTypeNotification = "notification"
|
|
|
|
eventSubStatusEnabled = "enabled"
|
|
eventSubStatusVerificationPending = "webhook_callback_verification_pending"
|
|
// eventSubStatusAuthorizationRevoked = "authorization_revoked"
|
|
// eventSubStatusFailuresExceeded = "notification_failures_exceeded"
|
|
// eventSubStatusUserRemoved = "user_removed"
|
|
// eventSubStatusVerificationFailed = "webhook_callback_verification_failed"
|
|
|
|
EventSubEventTypeChannelFollow = "channel.follow"
|
|
EventSubEventTypeChannelRaid = "channel.raid"
|
|
EventSubEventTypeChannelUpdate = "channel.update"
|
|
EventSubEventTypeStreamOffline = "stream.offline"
|
|
EventSubEventTypeStreamOnline = "stream.online"
|
|
|
|
EventSubEventTypeChannelPointCustomRewardRedemptionAdd = "channel.channel_points_custom_reward_redemption.add"
|
|
|
|
EventSubEventTypeUserAuthorizationRevoke = "user.authorization.revoke"
|
|
)
|
|
|
|
type (
|
|
EventSubClient struct {
|
|
apiURL string
|
|
secret string
|
|
secretHandle string
|
|
|
|
twitchClient *Client
|
|
|
|
subscriptions map[string]*registeredSubscription
|
|
subscriptionsLock sync.RWMutex
|
|
}
|
|
|
|
EventSubCondition struct {
|
|
BroadcasterUserID string `json:"broadcaster_user_id,omitempty"`
|
|
CampaignID string `json:"campaign_id,omitempty"`
|
|
CategoryID string `json:"category_id,omitempty"`
|
|
ClientID string `json:"client_id,omitempty"`
|
|
ExtensionClientID string `json:"extension_client_id,omitempty"`
|
|
FromBroadcasterUserID string `json:"from_broadcaster_user_id,omitempty"`
|
|
OrganizationID string `json:"organization_id,omitempty"`
|
|
RewardID string `json:"reward_id,omitempty"`
|
|
ToBroadcasterUserID string `json:"to_broadcaster_user_id,omitempty"`
|
|
UserID string `json:"user_id,omitempty"`
|
|
}
|
|
|
|
EventSubEventChannelPointCustomRewardRedemptionAdd struct {
|
|
ID string `json:"id"`
|
|
BroadcasterUserID string `json:"broadcaster_user_id"`
|
|
BroadcasterUserLogin string `json:"broadcaster_user_login"`
|
|
BroadcasterUserName string `json:"broadcaster_user_name"`
|
|
UserID string `json:"user_id"`
|
|
UserLogin string `json:"user_login"`
|
|
UserName string `json:"user_name"`
|
|
UserInput string `json:"user_input"`
|
|
Status string `json:"status"`
|
|
Reward struct {
|
|
ID string `json:"id"`
|
|
Title string `json:"title"`
|
|
Cost int64 `json:"cost"`
|
|
Prompt string `json:"prompt"`
|
|
} `json:"reward"`
|
|
RedeemedAt time.Time `json:"redeemed_at"`
|
|
}
|
|
|
|
EventSubEventChannelUpdate struct {
|
|
BroadcasterUserID string `json:"broadcaster_user_id"`
|
|
BroadcasterUserLogin string `json:"broadcaster_user_login"`
|
|
BroadcasterUserName string `json:"broadcaster_user_name"`
|
|
Title string `json:"title"`
|
|
Language string `json:"language"`
|
|
CategoryID string `json:"category_id"`
|
|
CategoryName string `json:"category_name"`
|
|
IsMature bool `json:"is_mature"`
|
|
}
|
|
|
|
EventSubEventFollow struct {
|
|
UserID string `json:"user_id"`
|
|
UserLogin string `json:"user_login"`
|
|
UserName string `json:"user_name"`
|
|
BroadcasterUserID string `json:"broadcaster_user_id"`
|
|
BroadcasterUserLogin string `json:"broadcaster_user_login"`
|
|
BroadcasterUserName string `json:"broadcaster_user_name"`
|
|
FollowedAt time.Time `json:"followed_at"`
|
|
}
|
|
|
|
EventSubEventRaid struct {
|
|
FromBroadcasterUserID string `json:"from_broadcaster_user_id"`
|
|
FromBroadcasterUserLogin string `json:"from_broadcaster_user_login"`
|
|
FromBroadcasterUserName string `json:"from_broadcaster_user_name"`
|
|
ToBroadcasterUserID string `json:"to_broadcaster_user_id"`
|
|
ToBroadcasterUserLogin string `json:"to_broadcaster_user_login"`
|
|
ToBroadcasterUserName string `json:"to_broadcaster_user_name"`
|
|
Viewers int64 `json:"viewers"`
|
|
}
|
|
|
|
EventSubEventStreamOffline struct {
|
|
BroadcasterUserID string `json:"broadcaster_user_id"`
|
|
BroadcasterUserLogin string `json:"broadcaster_user_login"`
|
|
BroadcasterUserName string `json:"broadcaster_user_name"`
|
|
}
|
|
|
|
EventSubEventStreamOnline struct {
|
|
ID string `json:"id"`
|
|
BroadcasterUserID string `json:"broadcaster_user_id"`
|
|
BroadcasterUserLogin string `json:"broadcaster_user_login"`
|
|
BroadcasterUserName string `json:"broadcaster_user_name"`
|
|
Type string `json:"type"`
|
|
StartedAt time.Time `json:"started_at"`
|
|
}
|
|
|
|
EventSubEventUserAuthorizationRevoke struct {
|
|
ClientID string `json:"client_id"`
|
|
UserID string `json:"user_id"`
|
|
UserLogin string `json:"user_login"`
|
|
UserName string `json:"user_name"`
|
|
}
|
|
|
|
eventSubPostMessage struct {
|
|
Challenge string `json:"challenge"`
|
|
Subscription eventSubSubscription `json:"subscription"`
|
|
Event json.RawMessage `json:"event"`
|
|
}
|
|
|
|
eventSubSubscription struct {
|
|
ID string `json:"id,omitempty"` // READONLY
|
|
Status string `json:"status,omitempty"` // READONLY
|
|
Type string `json:"type"`
|
|
Version string `json:"version"`
|
|
Cost int64 `json:"cost,omitempty"` // READONLY
|
|
Condition EventSubCondition `json:"condition"`
|
|
Transport eventSubTransport `json:"transport"`
|
|
CreatedAt time.Time `json:"created_at,omitempty"` // READONLY
|
|
}
|
|
|
|
eventSubTransport struct {
|
|
Method string `json:"method"`
|
|
Callback string `json:"callback"`
|
|
Secret string `json:"secret"`
|
|
}
|
|
|
|
registeredSubscription struct {
|
|
Type string
|
|
Callbacks map[string]func(json.RawMessage) error
|
|
Subscription eventSubSubscription
|
|
}
|
|
)
|
|
|
|
func (e EventSubCondition) Hash() (string, error) {
|
|
h, err := hashstructure.Hash(e, hashstructure.FormatV2, &hashstructure.HashOptions{TagName: "json"})
|
|
if err != nil {
|
|
return "", errors.Wrap(err, "hashing struct")
|
|
}
|
|
|
|
return fmt.Sprintf("%x", h), nil
|
|
}
|
|
|
|
func NewEventSubClient(twitchClient *Client, apiURL, secret, secretHandle string) (*EventSubClient, error) {
|
|
c := &EventSubClient{
|
|
apiURL: apiURL,
|
|
secret: secret,
|
|
secretHandle: secretHandle,
|
|
|
|
twitchClient: twitchClient,
|
|
|
|
subscriptions: map[string]*registeredSubscription{},
|
|
}
|
|
|
|
return c, c.PreFetchSubscriptions(context.Background())
|
|
}
|
|
|
|
func (e *EventSubClient) HandleEventsubPush(w http.ResponseWriter, r *http.Request) {
|
|
var (
|
|
body = new(bytes.Buffer)
|
|
keyHandle = mux.Vars(r)["keyhandle"]
|
|
message eventSubPostMessage
|
|
signature = r.Header.Get(eventSubHeaderMessageSignature)
|
|
)
|
|
|
|
if keyHandle != e.secretHandle {
|
|
http.Error(w, "deprecated callback used", http.StatusNotFound)
|
|
return
|
|
}
|
|
|
|
// Copy body for duplicate processing
|
|
if _, err := io.Copy(body, r.Body); err != nil {
|
|
log.WithError(err).Error("Unable to read hook body")
|
|
return
|
|
}
|
|
|
|
// Verify signature
|
|
mac := hmac.New(sha256.New, []byte(e.secret))
|
|
fmt.Fprintf(mac, "%s%s%s", r.Header.Get(eventSubHeaderMessageID), r.Header.Get(eventSubHeaderMessageTimestamp), body.Bytes())
|
|
if cSig := fmt.Sprintf("sha256=%x", mac.Sum(nil)); cSig != signature {
|
|
log.Errorf("Got message signature %s, expected %s", signature, cSig)
|
|
http.Error(w, "Signature verification failed", http.StatusUnauthorized)
|
|
return
|
|
}
|
|
|
|
// Read message
|
|
if err := json.NewDecoder(body).Decode(&message); err != nil {
|
|
log.WithError(err).Errorf("Unable to decode eventsub message")
|
|
http.Error(w, errors.Wrap(err, "parsing message").Error(), http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
logger := log.WithField("type", message.Subscription.Type)
|
|
|
|
// If we got a verification request, respond with the challenge
|
|
switch r.Header.Get(eventSubHeaderMessageType) {
|
|
case eventSubMessageTypeRevokation:
|
|
w.WriteHeader(http.StatusNoContent)
|
|
return
|
|
|
|
case eventSubMessageTypeVerification:
|
|
logger.Debug("Confirming eventsub subscription")
|
|
w.Write([]byte(message.Challenge))
|
|
return
|
|
}
|
|
|
|
logger.Debug("Received notification")
|
|
|
|
condHash, err := message.Subscription.Condition.Hash()
|
|
if err != nil {
|
|
logger.WithError(err).Errorf("Unable to hash condition of push")
|
|
http.Error(w, errors.Wrap(err, "hashing condition").Error(), http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
e.subscriptionsLock.RLock()
|
|
defer e.subscriptionsLock.RUnlock()
|
|
|
|
cacheKey := strings.Join([]string{message.Subscription.Type, condHash}, "::")
|
|
|
|
reg, ok := e.subscriptions[cacheKey]
|
|
if !ok {
|
|
http.Error(w, "no subscription available", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
for _, cb := range reg.Callbacks {
|
|
if err = cb(message.Event); err != nil {
|
|
logger.WithError(err).Error("Handler callback caused error")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (e *EventSubClient) PreFetchSubscriptions(ctx context.Context) error {
|
|
e.subscriptionsLock.Lock()
|
|
defer e.subscriptionsLock.Unlock()
|
|
|
|
subList, err := e.twitchClient.getEventSubSubscriptions(ctx)
|
|
if err != nil {
|
|
return errors.Wrap(err, "listing existing subscriptions")
|
|
}
|
|
|
|
for i := range subList {
|
|
sub := subList[i]
|
|
|
|
switch {
|
|
case !str.StringInSlice(sub.Status, []string{eventSubStatusEnabled, eventSubStatusVerificationPending}):
|
|
// Is not an active hook, we don't need to care: It will be
|
|
// confirmed later or will expire but should not be counted
|
|
continue
|
|
|
|
case strings.HasPrefix(sub.Transport.Callback, e.apiURL) && sub.Transport.Callback != e.fullAPIurl():
|
|
// Uses the same API URL but with another secret handle: Must
|
|
// have been registered by another instance with another secret
|
|
// so we should be able to deregister it without causing any
|
|
// trouble
|
|
logger := log.WithFields(log.Fields{
|
|
"id": sub.ID,
|
|
"topic": sub.Type,
|
|
})
|
|
logger.Debug("Removing deprecated EventSub subscription")
|
|
if err = e.twitchClient.deleteEventSubSubscription(ctx, sub.ID); err != nil {
|
|
logger.WithError(err).Error("Unable to deregister deprecated EventSub subscription")
|
|
}
|
|
continue
|
|
|
|
case sub.Transport.Callback != e.fullAPIurl():
|
|
// Different callback URL: We don't care, it's probably another
|
|
// bot instance with the same client ID
|
|
continue
|
|
}
|
|
|
|
condHash, err := sub.Condition.Hash()
|
|
if err != nil {
|
|
return errors.Wrap(err, "hashing condition")
|
|
}
|
|
|
|
cacheKey := strings.Join([]string{sub.Type, condHash}, "::")
|
|
e.subscriptions[cacheKey] = ®isteredSubscription{
|
|
Type: sub.Type,
|
|
Callbacks: map[string]func(json.RawMessage) error{},
|
|
Subscription: sub,
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (e *EventSubClient) RegisterEventSubHooks(event string, condition EventSubCondition, callback func(json.RawMessage) error) (func(), error) {
|
|
condHash, err := condition.Hash()
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "hashing condition")
|
|
}
|
|
|
|
var (
|
|
cacheKey = strings.Join([]string{event, condHash}, "::")
|
|
logger = log.WithField("event", event)
|
|
)
|
|
|
|
e.subscriptionsLock.RLock()
|
|
_, ok := e.subscriptions[cacheKey]
|
|
e.subscriptionsLock.RUnlock()
|
|
|
|
if ok {
|
|
// Subscription already exists
|
|
e.subscriptionsLock.Lock()
|
|
defer e.subscriptionsLock.Unlock()
|
|
|
|
logger.Debug("Adding callback to known subscription")
|
|
|
|
cbKey := uuid.Must(uuid.NewV4()).String()
|
|
|
|
e.subscriptions[cacheKey].Callbacks[cbKey] = callback
|
|
return func() { e.unregisterCallback(cacheKey, cbKey) }, nil
|
|
}
|
|
|
|
// Register subscriptions
|
|
ctx, cancel := context.WithTimeout(context.Background(), twitchRequestTimeout)
|
|
defer cancel()
|
|
|
|
newSub, err := e.twitchClient.createEventSubSubscription(ctx, eventSubSubscription{
|
|
Type: event,
|
|
Version: "1",
|
|
Condition: condition,
|
|
Transport: eventSubTransport{
|
|
Method: "webhook",
|
|
Callback: e.fullAPIurl(),
|
|
Secret: e.secret,
|
|
},
|
|
})
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "creating subscription")
|
|
}
|
|
|
|
e.subscriptionsLock.Lock()
|
|
defer e.subscriptionsLock.Unlock()
|
|
|
|
logger.Debug("Registered new hook")
|
|
|
|
cbKey := uuid.Must(uuid.NewV4()).String()
|
|
e.subscriptions[cacheKey] = ®isteredSubscription{
|
|
Type: event,
|
|
Callbacks: map[string]func(json.RawMessage) error{
|
|
cbKey: callback,
|
|
},
|
|
Subscription: *newSub,
|
|
}
|
|
|
|
logger.Debug("Registered eventsub subscription")
|
|
|
|
return func() { e.unregisterCallback(cacheKey, cbKey) }, nil
|
|
}
|
|
|
|
func (c *Client) createEventSubSubscription(ctx context.Context, sub eventSubSubscription) (*eventSubSubscription, error) {
|
|
var (
|
|
buf = new(bytes.Buffer)
|
|
resp struct {
|
|
Total int64 `json:"total"`
|
|
Data []eventSubSubscription `json:"data"`
|
|
Pagination struct {
|
|
Cursor string `json:"cursor"`
|
|
} `json:"pagination"`
|
|
}
|
|
)
|
|
|
|
if err := json.NewEncoder(buf).Encode(sub); err != nil {
|
|
return nil, errors.Wrap(err, "assemble subscribe payload")
|
|
}
|
|
|
|
if err := c.request(clientRequestOpts{
|
|
AuthType: authTypeAppAccessToken,
|
|
Body: buf,
|
|
Context: ctx,
|
|
Method: http.MethodPost,
|
|
OKStatus: http.StatusAccepted,
|
|
Out: &resp,
|
|
URL: "https://api.twitch.tv/helix/eventsub/subscriptions",
|
|
}); err != nil {
|
|
return nil, errors.Wrap(err, "executing request")
|
|
}
|
|
|
|
return &resp.Data[0], nil
|
|
}
|
|
|
|
func (c *Client) deleteEventSubSubscription(ctx context.Context, id string) error {
|
|
return errors.Wrap(c.request(clientRequestOpts{
|
|
AuthType: authTypeAppAccessToken,
|
|
Context: ctx,
|
|
Method: http.MethodDelete,
|
|
OKStatus: http.StatusNoContent,
|
|
URL: fmt.Sprintf("https://api.twitch.tv/helix/eventsub/subscriptions?id=%s", id),
|
|
}), "executing request")
|
|
}
|
|
|
|
func (e *EventSubClient) fullAPIurl() string {
|
|
return strings.Join([]string{e.apiURL, e.secretHandle}, "/")
|
|
}
|
|
|
|
func (c *Client) getEventSubSubscriptions(ctx context.Context) ([]eventSubSubscription, error) {
|
|
var (
|
|
out []eventSubSubscription
|
|
params = make(url.Values)
|
|
resp struct {
|
|
Total int64 `json:"total"`
|
|
Data []eventSubSubscription `json:"data"`
|
|
Pagination struct {
|
|
Cursor string `json:"cursor"`
|
|
} `json:"pagination"`
|
|
}
|
|
)
|
|
|
|
for {
|
|
if err := c.request(clientRequestOpts{
|
|
AuthType: authTypeAppAccessToken,
|
|
Context: ctx,
|
|
Method: http.MethodGet,
|
|
OKStatus: http.StatusOK,
|
|
Out: &resp,
|
|
URL: fmt.Sprintf("https://api.twitch.tv/helix/eventsub/subscriptions?%s", params.Encode()),
|
|
}); err != nil {
|
|
return nil, errors.Wrap(err, "executing request")
|
|
}
|
|
|
|
out = append(out, resp.Data...)
|
|
|
|
if resp.Pagination.Cursor == "" {
|
|
break
|
|
}
|
|
|
|
params.Set("after", resp.Pagination.Cursor)
|
|
resp.Pagination.Cursor = "" // Clear from struct as struct is reused
|
|
}
|
|
|
|
return out, nil
|
|
}
|
|
|
|
func (e *EventSubClient) unregisterCallback(cacheKey, cbKey string) {
|
|
e.subscriptionsLock.RLock()
|
|
regSub, ok := e.subscriptions[cacheKey]
|
|
e.subscriptionsLock.RUnlock()
|
|
|
|
if !ok {
|
|
// That subscription does not exist
|
|
log.WithField("cache_key", cacheKey).Debug("Subscription does not exist, not unregistering")
|
|
return
|
|
}
|
|
|
|
if _, ok = regSub.Callbacks[cbKey]; !ok {
|
|
// That callback does not exist
|
|
log.WithFields(log.Fields{
|
|
"cache_key": cacheKey,
|
|
"callback": cbKey,
|
|
}).Debug("Callback does not exist, not unregistering")
|
|
return
|
|
}
|
|
|
|
logger := log.WithField("event", regSub.Type)
|
|
|
|
delete(regSub.Callbacks, cbKey)
|
|
|
|
if len(regSub.Callbacks) > 0 {
|
|
// Still callbacks registered, not removing the subscription
|
|
return
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), twitchRequestTimeout)
|
|
defer cancel()
|
|
|
|
if err := e.twitchClient.deleteEventSubSubscription(ctx, regSub.Subscription.ID); err != nil {
|
|
log.WithError(err).Error("Unable to execute delete subscription request")
|
|
return
|
|
}
|
|
|
|
e.subscriptionsLock.Lock()
|
|
defer e.subscriptionsLock.Unlock()
|
|
|
|
logger.Debug("Unregistered hook")
|
|
|
|
delete(e.subscriptions, cacheKey)
|
|
}
|