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import {
KickWebhookError,
KickWebhookSignatureError,
validateKickWebhook,
type KickWebhookValidationResult,
} from "./validateWebhook";
import type { ErrorLogEntry } from "./errors/logError";
import type { Env } from "../config/env";
import { getDb, Prisma, type DbClient } from "../prisma";
import {
OAuth2AuthorizationUrl,
Routes,
type RESTPostOAuth2RefreshTokenResult,
} from "kick-api-types/rest";
import type { AppVariables } from "../app/types";
export interface KickBroadcasterAuth {
accountId: string;
accessToken: string;
}
const TOKEN_REFRESH_THRESHOLD_MS = 60_000;
const LOG_PREFIX = "[kick-webhook-middleware]";
const ACCOUNT_CACHE_TTL_SECONDS = 60;
const ACCOUNT_CACHE_TTL_MS = ACCOUNT_CACHE_TTL_SECONDS * 1_000;
const ACCOUNT_CACHE_TAG_PREFIX = "account";
const ACCOUNT_CACHE_TAG_MAX_LENGTH = 64;
type AccountRecord = {
id: string;
accountId: string;
accessToken: string | null;
refreshToken: string | null;
accessTokenExpiresAt: Date | null;
refreshTokenExpiresAt: Date | null;
};
type CachedAccount = {
value: AccountRecord;
expiresAt: number;
};
const accountCache = new Map<string, CachedAccount>();
function getAccountCacheTag(accountId: string): string {
const sanitized = accountId.replace(/[^0-9A-Za-z_]/g, "_");
const maxIdLength = Math.max(
1,
ACCOUNT_CACHE_TAG_MAX_LENGTH - (ACCOUNT_CACHE_TAG_PREFIX.length + 1)
);
const trimmed = sanitized.slice(0, maxIdLength);
const normalized = trimmed || "_";
return `${ACCOUNT_CACHE_TAG_PREFIX}_${normalized}`;
}
async function invalidateAccountCache(
db: DbClient,
accountId: string,
steps?: StepLogger
): Promise<void> {
const cacheTag = getAccountCacheTag(accountId);
const removed = accountCache.delete(accountId);
if (removed) {
steps?.note("Cleared local account cache", {
broadcasterAccountId: accountId,
});
}
if (!db.$accelerate?.invalidate) {
steps?.note("Accelerate invalidate unavailable", { cacheTag });
return;
}
try {
await db.$accelerate.invalidate({ tags: [cacheTag] });
steps?.note("Invalidated account cache", {
broadcasterAccountId: accountId,
cacheTag,
});
} catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
const maybeCode =
typeof error === "object" && error !== null && "code" in error
? (error as { code?: string }).code
: undefined;
if (
(error instanceof Prisma.PrismaClientKnownRequestError ||
maybeCode === "P6003") &&
maybeCode === "P6003"
) {
steps?.note("Accelerate invalidate rate limited", {
broadcasterAccountId: accountId,
cacheTag,
});
console.warn("Accelerate cache invalidation rate limited", {
broadcasterAccountId: accountId,
cacheTag,
});
return;
}
console.warn("Failed to invalidate account cache", {
broadcasterAccountId: accountId,
cacheTag,
error: errorMessage,
});
}
}
type StepHandle = {
id: number;
label: string;
};
type StepLogger = {
start: (label: string, meta?: Record<string, unknown>) => StepHandle;
success: (handle: StepHandle, meta?: Record<string, unknown>) => void;
fail: (handle: StepHandle, error: unknown) => void;
note: (label: string, meta?: Record<string, unknown>) => void;
};
export function formatStepMeta(meta?: Record<string, unknown>): string {
if (!meta) {
return "";
}
const entries = Object.entries(meta).filter(
([, value]) => value !== undefined
);
if (entries.length === 0) {
return "";
}
const formatted = entries.map(([key, value]) => {
if (value === null) {
return `${key}=null`;
}
if (typeof value === "string") {
return `${key}="${value}"`;
}
if (typeof value === "number" || typeof value === "boolean") {
return `${key}=${String(value)}`;
}
if (value instanceof Date) {
return `${key}="${value.toISOString()}"`;
}
return `${key}=${JSON.stringify(value)}`;
});
return ` ${formatted.join(" ")}`;
}
function createStepLogger(prefix: string): StepLogger {
let counter = 1;
const write = (
symbol: string,
handle: StepHandle,
meta?: Record<string, unknown>,
level: "log" | "error" = "log"
) => {
console[level](
`${prefix} #${handle.id} ${symbol} ${handle.label}${formatStepMeta(meta)}`
);
};
return {
start: (label, meta) => {
const handle = { id: counter++, label } satisfies StepHandle;
write("▶", handle, meta);
return handle;
},
success: (handle, meta) => {
write("✓", handle, meta);
},
fail: (handle, error) => {
const meta: Record<string, unknown> =
error instanceof Error
? { name: error.name, message: error.message }
: { error };
write("✗", handle, meta, "error");
},
note: (label, meta) => {
const handle = { id: counter++, label } satisfies StepHandle;
write("•", handle, meta);
},
};
}
function cloneAccountRecord(account: AccountRecord): AccountRecord {
return {
...account,
accessTokenExpiresAt: account.accessTokenExpiresAt
? new Date(account.accessTokenExpiresAt)
: null,
refreshTokenExpiresAt: account.refreshTokenExpiresAt
? new Date(account.refreshTokenExpiresAt)
: null,
};
}
function storeAccountInCache(account: AccountRecord): void {
accountCache.set(account.accountId, {
value: cloneAccountRecord(account),
expiresAt: Date.now() + ACCOUNT_CACHE_TTL_MS,
});
}
function getCachedAccount(accountId: string): AccountRecord | null {
const cached = accountCache.get(accountId);
if (!cached) {
return null;
}
if (cached.expiresAt <= Date.now()) {
accountCache.delete(accountId);
return null;
}
return cloneAccountRecord(cached.value);
}
async function fetchAccountWithCache(
db: DbClient,
accountId: string
): Promise<{ account: AccountRecord | null; fromCache: boolean }> {
const cached = getCachedAccount(accountId);
if (cached) {
return { account: cached, fromCache: true };
}
const record = await db.account.findFirst({
where: { accountId },
select: {
id: true,
accountId: true,
accessToken: true,
refreshToken: true,
accessTokenExpiresAt: true,
refreshTokenExpiresAt: true,
},
});
if (!record) {
return { account: null, fromCache: false };
}
const account = cloneAccountRecord(record as AccountRecord);
storeAccountInCache(account);
return { account, fromCache: false };
}
function clearAccountCacheEntries(accountId?: string): void {
if (typeof accountId === "string") {
accountCache.delete(accountId);
return;
}
accountCache.clear();
}
function isInvalidGrantError(error: unknown): boolean {
if (!(error instanceof Error)) {
return false;
}
return error.message.toLowerCase().includes("invalid_grant");
}
/**
* Creates a Hono middleware that validates Kick webhook requests, persists
* validation failures, and enriches the context with the parsed webhook payload
* and broadcaster authentication state.
*/
export function createKickWebhookValidationMiddleware<
Environment extends {
Bindings: Env;
Variables: AppVariables;
}
>(
recordError: (
env: Environment["Bindings"],
entry: ErrorLogEntry
) => Promise<void>
): MiddlewareHandler<Environment> {
return async (c, next) => {
const steps = createStepLogger(LOG_PREFIX);
const runStep = async <T>(
label: string,
action: () => Promise<T>,
options: {
startMeta?: Record<string, unknown>;
completeMeta?: (result: T) => Record<string, unknown> | undefined;
} = {}
): Promise<T> => {
const handle = steps.start(label, options.startMeta);
try {
const result = await action();
const successMeta = options.completeMeta?.(result);
steps.success(handle, successMeta);
return result;
} catch (error) {
steps.fail(handle, error);
throw error;
}
};
steps.note("Webhook received", {
path: c.req.path,
method: c.req.method,
eventType: c.req.header("Kick-Event-Type") ?? null,
messageId: c.req.header("Kick-Event-Message-Id") ?? null,
});
try {
const result = await runStep(
"Validate Kick webhook",
() => validateKickWebhook(c.req.raw),
{
completeMeta: (payload) => ({
knownType: payload.knownType,
eventType: payload.eventType,
messageId: payload.messageId,
}),
}
);
c.set("kickWebhook", result);
steps.note("Webhook payload stored", { eventType: result.eventType });
const broadcasterAuth = await runStep(
"Resolve broadcaster auth",
() => resolveBroadcasterAuth<Environment>(c, result, steps),
{
completeMeta: (auth) => ({
accountId: auth?.accountId ?? null,
hasAccessToken: Boolean(auth?.accessToken),
}),
}
);
c.set("kickBroadcasterAuth", broadcasterAuth);
steps.note("Broadcaster auth stored", {
registered: Boolean(broadcasterAuth),
});
await runStep("Invoke downstream handlers", () => next());
} catch (error) {
steps.note("Preparing failure context", {
error:
error instanceof Error
? `${error.name}: ${error.message}`
: String(error),
path: c.req.path,
});
await runStep("Record webhook failure", () =>
recordError(c.env, {
message:
error instanceof Error ? error.message : "Unknown webhook error",
status: error instanceof KickWebhookError ? error.status : 500,
context: {
path: c.req.path,
eventType: c.req.header("Kick-Event-Type"),
messageId: c.req.header("Kick-Event-Message-Id"),
},
})
);
if (error instanceof KickWebhookSignatureError) {
console.warn("Rejected Kick webhook", { reason: error.message });
steps.note("Responding with signature failure", {
status: error.status,
});
return c.json({ error: "Unauthorized" }, error.status);
}
if (error instanceof KickWebhookError) {
steps.note("Responding with webhook error", {
status: error.status,
reason: error.message,
});
return c.json({ error: error.message }, error.status);
}
console.error("Unexpected webhook failure", error);
steps.note("Responding with unexpected error", { status: 500 });
return c.json({ error: "Internal Server Error" }, 500);
}
};
}
/**
* Resolves the broadcaster account associated with a validated webhook payload,
* refreshing the access token when necessary.
*/
async function resolveBroadcasterAuth<
Environment extends {
Bindings: Env;
Variables: AppVariables;
}
>(
c: Parameters<MiddlewareHandler<Environment>>[0],
result: KickWebhookValidationResult,
steps?: StepLogger
): Promise<KickBroadcasterAuth | null> {
const idStep = steps?.start("Extract broadcaster account id");
const broadcasterAccountId = extractBroadcasterAccountId(result);
if (steps && idStep) {
steps.success(idStep, {
broadcasterAccountId: broadcasterAccountId ?? null,
});
}
if (!broadcasterAccountId) {
steps?.note("Broadcaster account id missing", {
eventType: result.eventType,
});
return null;
}
steps?.note("Resolving broadcaster account", { broadcasterAccountId });
const databaseUrl = c.env.DATABASE_URL;
if (!databaseUrl) {
steps?.note("Database binding missing");
throw new Error("Missing DATABASE_URL binding");
}
const db = getDb(databaseUrl);
const lookupStep = steps?.start("Lookup broadcaster account", {
broadcasterAccountId,
});
const { account: fetchedAccount, fromCache } = await fetchAccountWithCache(
db,
broadcasterAccountId
);
console.log(
"[account-lookup-result]",
JSON.stringify({ account: fetchedAccount, fromCache })
);
if (steps && lookupStep) {
steps.success(lookupStep, {
found: Boolean(fetchedAccount),
cacheHit: fromCache,
});
}
let account = fetchedAccount;
if (!account) {
steps?.note("Broadcaster account not registered", {
broadcasterAccountId,
});
return null;
}
const now = Date.now();
const accessTokenExpiresAt = account.accessTokenExpiresAt
? new Date(account.accessTokenExpiresAt).getTime()
: null;
const shouldRefresh =
!account.accessToken ||
!accessTokenExpiresAt ||
accessTokenExpiresAt - now <= TOKEN_REFRESH_THRESHOLD_MS;
if (shouldRefresh) {
if (!account.refreshToken) {
steps?.note("Missing refresh token for broadcaster", {
broadcasterAccountId,
});
throw new Error(
`Kick broadcaster account ${account.accountId} is missing a refresh token`
);
}
const clientId = c.env.KICK_CLIENT_ID;
const clientSecret = c.env.KICK_CLIENT_SECRET;
if (!clientId || !clientSecret) {
steps?.note("Missing Kick OAuth client credentials", {
hasClientId: Boolean(clientId),
hasClientSecret: Boolean(clientSecret),
});
throw new Error("Missing Kick OAuth client credentials");
}
const expiresAtMeta =
account.accessTokenExpiresAt == null
? null
: account.accessTokenExpiresAt;
let validationStep: StepHandle | undefined;
let introspection: TokenIntrospectionResult | undefined;
if (steps) {
validationStep = steps.start("Validate refresh token", {
broadcasterAccountId,
});
}
try {
introspection = await validateRefreshToken({
refreshToken: account.refreshToken,
clientId,
clientSecret,
});
if (steps && validationStep) {
const meta: Record<string, unknown> = {
active: introspection.active,
};
if (typeof introspection.exp === "number") {
meta.expiresAt = new Date(introspection.exp * 1000);
}
if (typeof introspection.token_type === "string") {
meta.tokenType = introspection.token_type;
}
steps.success(validationStep, meta);
}
} catch (error) {
if (steps && validationStep) {
steps.fail(validationStep, error);
}
}
if (introspection && !introspection.active) {
const reason =
typeof introspection.error_description === "string"
? introspection.error_description
: typeof introspection.error === "string"
? introspection.error
: "inactive";
throw new Error(
`Kick refresh token for account ${account.accountId} is not active (${reason})`
);
}
let refreshStep: StepHandle | undefined;
if (steps) {
refreshStep = steps.start("Refresh broadcaster access token", {
broadcasterAccountId,
expiresAt: expiresAtMeta,
});
}
let refreshed: RESTPostOAuth2RefreshTokenResult;
try {
refreshed = await refreshAccessToken({
refreshToken: account.refreshToken,
clientId,
clientSecret,
});
} catch (error) {
if (steps && refreshStep) {
steps.fail(refreshStep, error);
}
if (isInvalidGrantError(error)) {
steps?.note("Clearing invalid broadcaster tokens", {
broadcasterAccountId,
});
await db.account.update({
where: { id: account.id },
data: {
accessToken: null,
accessTokenExpiresAt: null,
refreshToken: null,
refreshTokenExpiresAt: null,
},
});
account.accessToken = null;
account.refreshToken = null;
account.accessTokenExpiresAt = null;
account.refreshTokenExpiresAt = null;
await invalidateAccountCache(db, account.accountId, steps);
throw new Error(
`Kick refresh token for account ${account.accountId} is invalid or expired`
);
}
throw error;
}
const refreshedExpiresAt = new Date(
Date.now() + refreshed.expires_in * 1000
);
await db.account.update({
where: { id: account.id },
data: {
accessToken: refreshed.access_token,
accessTokenExpiresAt: refreshedExpiresAt,
refreshToken: refreshed.refresh_token ?? account.refreshToken,
},
});
account.accessToken = refreshed.access_token;
account.refreshToken = refreshed.refresh_token ?? account.refreshToken;
account.accessTokenExpiresAt = refreshedExpiresAt;
await invalidateAccountCache(db, account.accountId, steps);
storeAccountInCache(account);
if (steps && refreshStep) {
steps.success(refreshStep, {
expiresAt: refreshedExpiresAt,
});
}
}
return {
accountId: account.accountId,
accessToken: account.accessToken!,
};
}
function extractBroadcasterAccountId(
result: KickWebhookValidationResult
): string | null {
if (!result.knownType) {
return null;
}
const payload = result.payload;
const broadcasterCandidate = normalizeAccountId(payload.broadcaster?.user_id);
if (broadcasterCandidate) {
return broadcasterCandidate;
}
if (
typeof payload === "object" &&
payload !== null &&
"broadcaster_user_id" in payload
) {
const candidate = normalizeAccountId(
(payload as { broadcaster_user_id?: unknown }).broadcaster_user_id
);
if (candidate) {
return candidate;
}
}
return null;
}
function normalizeAccountId(value: unknown): string | null {
if (typeof value === "number" && Number.isFinite(value)) {
return String(value);
}
if (typeof value === "string" && value.trim().length > 0) {
return value;
}
return null;
}
interface RefreshOptions {
refreshToken: string;
clientId: string;
clientSecret: string;
}
type RefreshTokenValidationOptions = RefreshOptions & {
tokenTypeHint?: "access_token" | "refresh_token";
};
type TokenIntrospectionResult = {
active: boolean;
scope?: string;
token_type?: string;
exp?: number;
client_id?: string;
sub?: string;
error?: string;
error_description?: string;
[key: string]: unknown;
};
async function validateRefreshToken(
options: RefreshTokenValidationOptions
): Promise<TokenIntrospectionResult> {
const url = `${OAuth2AuthorizationUrl}${Routes.TokenIntrospect()}`;
const params = new URLSearchParams({
token: options.refreshToken,
token_type_hint: options.tokenTypeHint ?? "refresh_token",
client_id: options.clientId,
client_secret: options.clientSecret,
});
let encodedCredentials: string | undefined;
if (typeof btoa === "function") {
encodedCredentials = btoa(`${options.clientId}:${options.clientSecret}`);
} else if (typeof Buffer !== "undefined") {
encodedCredentials = Buffer.from(
`${options.clientId}:${options.clientSecret}`,
"utf8"
).toString("base64");
}
const headers: Record<string, string> = {
"Content-Type": "application/x-www-form-urlencoded",
Accept: "application/json",
};
if (encodedCredentials) {
headers.Authorization = `Basic ${encodedCredentials}`;
}
const response = await fetch(url, {
method: "POST",
headers,
body: params.toString(),
});
const rawBody = await safeReadBody(response);
if (!response.ok) {
const detail = extractKickErrorDetail(rawBody);
throw new Error(
`Kick token introspection failed (${response.status}): ${detail}`
);
}
if (!rawBody || rawBody === "<no response body>") {
throw new Error("Kick token introspection returned an empty response");
}
let parsed: unknown;
try {
parsed = JSON.parse(rawBody) as TokenIntrospectionResult;
} catch {
throw new Error("Kick token introspection returned malformed JSON");
}
if (
typeof parsed !== "object" ||
parsed === null ||
typeof (parsed as TokenIntrospectionResult).active !== "boolean"
) {
throw new Error("Kick token introspection returned unexpected payload");
}
return parsed as TokenIntrospectionResult;
}
function extractKickErrorDetail(raw: string): string {
if (!raw) {
return "<empty response body>";
}
if (raw === "<no response body>") {
return raw;
}
try {
const parsed = JSON.parse(raw) as {
error?: unknown;
error_description?: unknown;
};
if (typeof parsed === "object" && parsed !== null) {
if (typeof parsed.error_description === "string") {
return parsed.error_description;
}
if (typeof parsed.error === "string") {
return parsed.error;
}
}
} catch {
// fall through to raw output
}
return raw;
}
async function refreshAccessToken(
options: RefreshOptions
): Promise<RESTPostOAuth2RefreshTokenResult> {
const url = `${OAuth2AuthorizationUrl}${Routes.OAuthRefresh()}`;
const params = new URLSearchParams({
grant_type: "refresh_token",
client_id: options.clientId,
client_secret: options.clientSecret,
refresh_token: options.refreshToken,
});
const response = await fetch(url, {
method: "POST",
headers: {
"Content-Type": "application/x-www-form-urlencoded",
Accept: "application/json",
},
body: params.toString(),
});
if (!response.ok) {
const detail = await safeReadBody(response);
throw new Error(
`Failed to refresh Kick access token (${response.status}): ${detail}`
);
}
const data = (await response.json()) as RESTPostOAuth2RefreshTokenResult;
if (!data?.access_token) {
throw new Error("Kick refresh response did not include an access_token");
}
return data;
}
async function safeReadBody(response: Response): Promise<string> {
try {
return await response.text();
} catch (error) {
console.error("Failed to read Kick refresh response body", error);
return "<no response body>";
}
}
export const __test = {
resolveBroadcasterAuth,
refreshAccessToken,
validateRefreshToken,
extractBroadcasterAccountId,
getAccountCacheTag,
clearAccountCacheEntries,
} as const;
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