mirror of
https://github.com/Luzifer/twitch-bot.git
synced 2024-09-19 18:12:55 +00:00
439 lines
14 KiB
Go
439 lines
14 KiB
Go
package twitch
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import (
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"bytes"
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/gofrs/uuid/v3"
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"github.com/gorilla/mux"
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"github.com/mitchellh/hashstructure/v2"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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"github.com/Luzifer/go_helpers/v2/str"
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)
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const (
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eventSubHeaderMessageID = "Twitch-Eventsub-Message-Id"
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eventSubHeaderMessageType = "Twitch-Eventsub-Message-Type"
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eventSubHeaderMessageSignature = "Twitch-Eventsub-Message-Signature"
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eventSubHeaderMessageTimestamp = "Twitch-Eventsub-Message-Timestamp"
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// eventSubHeaderMessageRetry = "Twitch-Eventsub-Message-Retry"
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// eventSubHeaderSubscriptionType = "Twitch-Eventsub-Subscription-Type"
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// eventSubHeaderSubscriptionVersion = "Twitch-Eventsub-Subscription-Version"
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eventSubMessageTypeVerification = "webhook_callback_verification"
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eventSubMessageTypeRevokation = "revocation"
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// eventSubMessageTypeNotification = "notification"
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eventSubStatusEnabled = "enabled"
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eventSubStatusVerificationPending = "webhook_callback_verification_pending"
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// eventSubStatusAuthorizationRevoked = "authorization_revoked"
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// eventSubStatusFailuresExceeded = "notification_failures_exceeded"
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// eventSubStatusUserRemoved = "user_removed"
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// eventSubStatusVerificationFailed = "webhook_callback_verification_failed"
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EventSubEventTypeChannelFollow = "channel.follow"
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EventSubEventTypeChannelUpdate = "channel.update"
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EventSubEventTypeStreamOffline = "stream.offline"
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EventSubEventTypeStreamOnline = "stream.online"
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EventSubEventTypeChannelPointCustomRewardRedemptionAdd = "channel.channel_points_custom_reward_redemption.add"
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EventSubEventTypeUserAuthorizationRevoke = "user.authorization.revoke"
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)
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type (
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EventSubClient struct {
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apiURL string
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secret string
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secretHandle string
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twitchClient *Client
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subscriptions map[string]*registeredSubscription
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subscriptionsLock sync.RWMutex
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}
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EventSubCondition struct {
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BroadcasterUserID string `json:"broadcaster_user_id,omitempty"`
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CampaignID string `json:"campaign_id,omitempty"`
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CategoryID string `json:"category_id,omitempty"`
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ClientID string `json:"client_id,omitempty"`
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ExtensionClientID string `json:"extension_client_id,omitempty"`
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FromBroadcasterUserID string `json:"from_broadcaster_user_id,omitempty"`
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OrganizationID string `json:"organization_id,omitempty"`
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RewardID string `json:"reward_id,omitempty"`
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ToBroadcasterUserID string `json:"to_broadcaster_user_id,omitempty"`
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UserID string `json:"user_id,omitempty"`
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}
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EventSubEventChannelPointCustomRewardRedemptionAdd struct {
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ID string `json:"id"`
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BroadcasterUserID string `json:"broadcaster_user_id"`
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BroadcasterUserLogin string `json:"broadcaster_user_login"`
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BroadcasterUserName string `json:"broadcaster_user_name"`
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UserID string `json:"user_id"`
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UserLogin string `json:"user_login"`
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UserName string `json:"user_name"`
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UserInput string `json:"user_input"`
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Status string `json:"status"`
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Reward struct {
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ID string `json:"id"`
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Title string `json:"title"`
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Cost int64 `json:"cost"`
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Prompt string `json:"prompt"`
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} `json:"reward"`
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RedeemedAt time.Time `json:"redeemed_at"`
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}
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EventSubEventChannelUpdate struct {
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BroadcasterUserID string `json:"broadcaster_user_id"`
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BroadcasterUserLogin string `json:"broadcaster_user_login"`
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BroadcasterUserName string `json:"broadcaster_user_name"`
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Title string `json:"title"`
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Language string `json:"language"`
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CategoryID string `json:"category_id"`
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CategoryName string `json:"category_name"`
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IsMature bool `json:"is_mature"`
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}
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EventSubEventFollow struct {
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UserID string `json:"user_id"`
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UserLogin string `json:"user_login"`
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UserName string `json:"user_name"`
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BroadcasterUserID string `json:"broadcaster_user_id"`
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BroadcasterUserLogin string `json:"broadcaster_user_login"`
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BroadcasterUserName string `json:"broadcaster_user_name"`
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FollowedAt time.Time `json:"followed_at"`
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}
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EventSubEventStreamOffline struct {
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BroadcasterUserID string `json:"broadcaster_user_id"`
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BroadcasterUserLogin string `json:"broadcaster_user_login"`
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BroadcasterUserName string `json:"broadcaster_user_name"`
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}
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EventSubEventStreamOnline struct {
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ID string `json:"id"`
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BroadcasterUserID string `json:"broadcaster_user_id"`
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BroadcasterUserLogin string `json:"broadcaster_user_login"`
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BroadcasterUserName string `json:"broadcaster_user_name"`
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Type string `json:"type"`
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StartedAt time.Time `json:"started_at"`
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}
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EventSubEventUserAuthorizationRevoke struct {
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ClientID string `json:"client_id"`
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UserID string `json:"user_id"`
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UserLogin string `json:"user_login"`
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UserName string `json:"user_name"`
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}
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eventSubPostMessage struct {
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Challenge string `json:"challenge"`
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Subscription eventSubSubscription `json:"subscription"`
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Event json.RawMessage `json:"event"`
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}
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eventSubSubscription struct {
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ID string `json:"id,omitempty"` // READONLY
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Status string `json:"status,omitempty"` // READONLY
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Type string `json:"type"`
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Version string `json:"version"`
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Cost int64 `json:"cost,omitempty"` // READONLY
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Condition EventSubCondition `json:"condition"`
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Transport eventSubTransport `json:"transport"`
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CreatedAt time.Time `json:"created_at,omitempty"` // READONLY
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}
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eventSubTransport struct {
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Method string `json:"method"`
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Callback string `json:"callback"`
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Secret string `json:"secret"`
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}
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registeredSubscription struct {
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Type string
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Callbacks map[string]func(json.RawMessage) error
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Subscription eventSubSubscription
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}
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)
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func (e EventSubCondition) Hash() (string, error) {
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h, err := hashstructure.Hash(e, hashstructure.FormatV2, &hashstructure.HashOptions{TagName: "json"})
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if err != nil {
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return "", errors.Wrap(err, "hashing struct")
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}
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return fmt.Sprintf("%x", h), nil
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}
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func NewEventSubClient(twitchClient *Client, apiURL, secret, secretHandle string) (*EventSubClient, error) {
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c := &EventSubClient{
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apiURL: apiURL,
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secret: secret,
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secretHandle: secretHandle,
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twitchClient: twitchClient,
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subscriptions: map[string]*registeredSubscription{},
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}
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return c, c.PreFetchSubscriptions(context.Background())
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}
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func (e *EventSubClient) HandleEventsubPush(w http.ResponseWriter, r *http.Request) {
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var (
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body = new(bytes.Buffer)
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keyHandle = mux.Vars(r)["keyhandle"]
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message eventSubPostMessage
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signature = r.Header.Get(eventSubHeaderMessageSignature)
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)
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if keyHandle != e.secretHandle {
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http.Error(w, "deprecated callback used", http.StatusNotFound)
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return
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}
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// Copy body for duplicate processing
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if _, err := io.Copy(body, r.Body); err != nil {
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log.WithError(err).Error("Unable to read hook body")
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return
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}
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// Verify signature
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mac := hmac.New(sha256.New, []byte(e.secret))
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fmt.Fprintf(mac, "%s%s%s", r.Header.Get(eventSubHeaderMessageID), r.Header.Get(eventSubHeaderMessageTimestamp), body.Bytes())
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if cSig := fmt.Sprintf("sha256=%x", mac.Sum(nil)); cSig != signature {
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log.Errorf("Got message signature %s, expected %s", signature, cSig)
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http.Error(w, "Signature verification failed", http.StatusUnauthorized)
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return
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}
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// Read message
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if err := json.NewDecoder(body).Decode(&message); err != nil {
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log.WithError(err).Errorf("Unable to decode eventsub message")
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http.Error(w, errors.Wrap(err, "parsing message").Error(), http.StatusBadRequest)
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return
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}
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logger := log.WithField("type", message.Subscription.Type)
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// If we got a verification request, respond with the challenge
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switch r.Header.Get(eventSubHeaderMessageType) {
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case eventSubMessageTypeRevokation:
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w.WriteHeader(http.StatusNoContent)
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return
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case eventSubMessageTypeVerification:
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logger.Debug("Confirming eventsub subscription")
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w.Write([]byte(message.Challenge))
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return
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}
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logger.Debug("Received notification")
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condHash, err := message.Subscription.Condition.Hash()
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if err != nil {
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logger.WithError(err).Errorf("Unable to hash condition of push")
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http.Error(w, errors.Wrap(err, "hashing condition").Error(), http.StatusBadRequest)
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return
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}
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e.subscriptionsLock.RLock()
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defer e.subscriptionsLock.RUnlock()
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cacheKey := strings.Join([]string{message.Subscription.Type, condHash}, "::")
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reg, ok := e.subscriptions[cacheKey]
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if !ok {
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http.Error(w, "no subscription available", http.StatusBadRequest)
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return
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}
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for _, cb := range reg.Callbacks {
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if err = cb(message.Event); err != nil {
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logger.WithError(err).Error("Handler callback caused error")
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}
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}
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}
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func (e *EventSubClient) PreFetchSubscriptions(ctx context.Context) error {
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e.subscriptionsLock.Lock()
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defer e.subscriptionsLock.Unlock()
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subList, err := e.twitchClient.getEventSubSubscriptions(ctx)
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if err != nil {
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return errors.Wrap(err, "listing existing subscriptions")
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}
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for i := range subList {
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sub := subList[i]
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switch {
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case !str.StringInSlice(sub.Status, []string{eventSubStatusEnabled, eventSubStatusVerificationPending}):
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// Is not an active hook, we don't need to care: It will be
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// confirmed later or will expire but should not be counted
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continue
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case strings.HasPrefix(sub.Transport.Callback, e.apiURL) && sub.Transport.Callback != e.fullAPIurl():
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// Uses the same API URL but with another secret handle: Must
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// have been registered by another instance with another secret
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// so we should be able to deregister it without causing any
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// trouble
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logger := log.WithFields(log.Fields{
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"id": sub.ID,
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"topic": sub.Type,
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})
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logger.Debug("Removing deprecated EventSub subscription")
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if err = e.twitchClient.deleteEventSubSubscription(ctx, sub.ID); err != nil {
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logger.WithError(err).Error("Unable to deregister deprecated EventSub subscription")
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}
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continue
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case sub.Transport.Callback != e.fullAPIurl():
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// Different callback URL: We don't care, it's probably another
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// bot instance with the same client ID
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continue
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}
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condHash, err := sub.Condition.Hash()
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if err != nil {
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return errors.Wrap(err, "hashing condition")
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}
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cacheKey := strings.Join([]string{sub.Type, condHash}, "::")
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e.subscriptions[cacheKey] = ®isteredSubscription{
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Type: sub.Type,
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Callbacks: map[string]func(json.RawMessage) error{},
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Subscription: sub,
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}
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}
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return nil
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}
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func (e *EventSubClient) RegisterEventSubHooks(event string, condition EventSubCondition, callback func(json.RawMessage) error) (func(), error) {
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condHash, err := condition.Hash()
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if err != nil {
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return nil, errors.Wrap(err, "hashing condition")
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}
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var (
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cacheKey = strings.Join([]string{event, condHash}, "::")
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logger = log.WithField("event", event)
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)
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e.subscriptionsLock.RLock()
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_, ok := e.subscriptions[cacheKey]
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e.subscriptionsLock.RUnlock()
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if ok {
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// Subscription already exists
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e.subscriptionsLock.Lock()
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defer e.subscriptionsLock.Unlock()
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logger.Debug("Adding callback to known subscription")
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cbKey := uuid.Must(uuid.NewV4()).String()
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e.subscriptions[cacheKey].Callbacks[cbKey] = callback
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return func() { e.unregisterCallback(cacheKey, cbKey) }, nil
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}
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// Register subscriptions
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ctx, cancel := context.WithTimeout(context.Background(), twitchRequestTimeout)
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defer cancel()
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newSub, err := e.twitchClient.createEventSubSubscription(ctx, eventSubSubscription{
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Type: event,
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Version: "1",
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Condition: condition,
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Transport: eventSubTransport{
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Method: "webhook",
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Callback: e.fullAPIurl(),
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Secret: e.secret,
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},
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})
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if err != nil {
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return nil, errors.Wrap(err, "creating subscription")
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}
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e.subscriptionsLock.Lock()
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defer e.subscriptionsLock.Unlock()
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logger.Debug("Registered new hook")
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cbKey := uuid.Must(uuid.NewV4()).String()
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e.subscriptions[cacheKey] = ®isteredSubscription{
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Type: event,
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Callbacks: map[string]func(json.RawMessage) error{
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cbKey: callback,
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},
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Subscription: *newSub,
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}
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logger.Debug("Registered eventsub subscription")
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return func() { e.unregisterCallback(cacheKey, cbKey) }, nil
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}
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func (e *EventSubClient) fullAPIurl() string {
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return strings.Join([]string{e.apiURL, e.secretHandle}, "/")
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}
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func (e *EventSubClient) unregisterCallback(cacheKey, cbKey string) {
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e.subscriptionsLock.RLock()
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regSub, ok := e.subscriptions[cacheKey]
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e.subscriptionsLock.RUnlock()
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if !ok {
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// That subscription does not exist
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log.WithField("cache_key", cacheKey).Debug("Subscription does not exist, not unregistering")
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return
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}
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if _, ok = regSub.Callbacks[cbKey]; !ok {
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// That callback does not exist
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log.WithFields(log.Fields{
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"cache_key": cacheKey,
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"callback": cbKey,
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}).Debug("Callback does not exist, not unregistering")
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return
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}
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logger := log.WithField("event", regSub.Type)
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delete(regSub.Callbacks, cbKey)
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if len(regSub.Callbacks) > 0 {
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// Still callbacks registered, not removing the subscription
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return
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}
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ctx, cancel := context.WithTimeout(context.Background(), twitchRequestTimeout)
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defer cancel()
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if err := e.twitchClient.deleteEventSubSubscription(ctx, regSub.Subscription.ID); err != nil {
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log.WithError(err).Error("Unable to execute delete subscription request")
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return
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}
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e.subscriptionsLock.Lock()
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defer e.subscriptionsLock.Unlock()
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logger.Debug("Unregistered hook")
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delete(e.subscriptions, cacheKey)
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}
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