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export type BearerTokenAudience = 'mcp' | 'api2' | (string & {})
export type BearerTokenResponse = {
access_token: string
token_type: 'Bearer'
expires_in: number
scope?: string
}
export type MintBearerTokenOptions = {
allowProcessEnvEndpointFallback?: boolean
endpoint?: string
aud?: BearerTokenAudience | string
/**
* Requested scopes. Must be a subset of the auth key's scope.
*
* If omitted, the token inherits the auth key's scope.
*/
scope?: string[] | string
timeoutMs?: number
}
export type MintBearerTokenResult =
| { ok: true; raw: string; data: BearerTokenResponse }
| { ok: false; error: string }
const tokenErrorSchema = z
.object({
error: z.string(),
message: z.string().optional(),
})
.passthrough()
const tokenSuccessSchema = z
.object({
access_token: z.string().min(1),
token_type: z.literal('Bearer').optional(),
expires_in: z.number(),
scope: z.string().optional(),
})
.passthrough()
const buildBasicAuthHeaderValue = (credentials: { authKey: string; authSecret: string }): string =>
`Basic ${Buffer.from(`${credentials.authKey}:${credentials.authSecret}`, 'utf8').toString('base64')}`
const isLoopbackHost = (hostname: string): boolean =>
hostname === 'localhost' || hostname === '::1' || hostname.startsWith('127.')
type TokenBaseResult = { ok: true; baseUrl: URL } | { ok: false; error: string }
const normalizeTokenBaseEndpoint = (
raw?: string,
allowProcessEnvEndpointFallback = true,
): TokenBaseResult => {
const baseRaw = (
raw ||
(allowProcessEnvEndpointFallback ? process.env.TRANSLOADIT_ENDPOINT : undefined) ||
'https://api2.transloadit.com'
).trim()
let url: URL
try {
url = new URL(baseRaw)
} catch {
return {
ok: false,
error:
'Invalid endpoint URL. Use --endpoint https://api2.transloadit.com (or set TRANSLOADIT_ENDPOINT).',
}
}
if (url.username || url.password) {
return { ok: false, error: 'Endpoint must not include username/password.' }
}
if (url.search || url.hash) {
return { ok: false, error: 'Endpoint must not include query string or hash.' }
}
if (url.protocol !== 'https:') {
if (url.protocol === 'http:' && isLoopbackHost(url.hostname)) {
// Allowed for local development only.
} else {
return {
ok: false,
error:
'Refusing to send credentials to a non-HTTPS endpoint. Use https://... (or http://localhost for local development).',
}
}
}
// If someone pasted the token URL, normalize it back to the API base to avoid /token/token.
const pathLower = url.pathname.toLowerCase()
if (pathLower === '/token' || pathLower === '/token/') {
url.pathname = '/'
}
if (!url.pathname.endsWith('/')) {
url.pathname = `${url.pathname}/`
}
return { ok: true, baseUrl: url }
}
const normalizeScopeInput = (input?: string[] | string): string | undefined => {
if (input == null) return undefined
const raw = Array.isArray(input) ? input.join(' ') : String(input)
const trimmed = raw.trim()
if (!trimmed) return undefined
const parts = trimmed.split(/[\s,]+/).map((p) => p.trim())
const seen = new Set<string>()
const out: string[] = []
for (const part of parts) {
if (!part || seen.has(part)) continue
seen.add(part)
out.push(part)
}
return out.length > 0 ? out.join(' ') : undefined
}
export async function mintBearerTokenWithCredentials(
credentials: { authKey: string; authSecret: string },
options: MintBearerTokenOptions = {},
): Promise<MintBearerTokenResult> {
const endpointResult = normalizeTokenBaseEndpoint(
options.endpoint,
options.allowProcessEnvEndpointFallback,
)
if (!endpointResult.ok) {
return { ok: false, error: endpointResult.error }
}
const url = new URL('token', endpointResult.baseUrl).toString()
const aud = (options.aud ?? 'mcp').trim() || 'mcp'
const scope = normalizeScopeInput(options.scope)
const timeoutMs = options.timeoutMs ?? 15_000
const params = new URLSearchParams({
grant_type: 'client_credentials',
aud,
})
if (scope) params.set('scope', scope)
let res: Response
const controller = new AbortController()
const timeout = setTimeout(() => controller.abort(), timeoutMs)
try {
res = await fetch(url, {
method: 'POST',
// Never follow redirects with Basic Auth credentials.
redirect: 'error',
signal: controller.signal,
headers: {
Authorization: buildBasicAuthHeaderValue(credentials),
Accept: 'application/json',
'Content-Type': 'application/x-www-form-urlencoded',
},
body: params.toString(),
})
} catch (err) {
clearTimeout(timeout)
if (err instanceof Error && err.name === 'AbortError') {
return {
ok: false,
error: `Failed to mint bearer token: request timed out after ${Math.round(timeoutMs / 1000)}s.`,
}
}
const message = err instanceof Error ? err.message : String(err)
return { ok: false, error: `Failed to mint bearer token: ${message}` }
} finally {
clearTimeout(timeout)
}
const text = await res.text()
const trimmed = text.trim()
let parsedJson: unknown = null
try {
parsedJson = trimmed ? JSON.parse(trimmed) : null
} catch {
parsedJson = null
}
if (res.ok) {
if (parsedJson == null) {
return { ok: false, error: 'Token response was not valid JSON.' }
}
const parsed = tokenSuccessSchema.safeParse(parsedJson)
if (!parsed.success) {
return { ok: false, error: 'Token response did not include an access_token.' }
}
const data: BearerTokenResponse = {
...parsed.data,
token_type: parsed.data.token_type ?? 'Bearer',
}
return { ok: true, raw: trimmed, data }
}
const parsedError = tokenErrorSchema.safeParse(parsedJson)
if (parsedError.success) {
return {
ok: false,
error: parsedError.data.message
? `${parsedError.data.error}: ${parsedError.data.message}`
: parsedError.data.error,
}
}
return {
ok: false,
error: `Token request failed (${res.status}): ${trimmed || res.statusText}`,
}
}
|