opencode/packages/opencode/src/plugin/snowflake-cortex.ts at dev · argszero/opencode · GitHub

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import type { Hooks, PluginInput } from "@opencode-ai/plugin"

import { OAUTH_DUMMY_KEY } from "../auth"

import { InstallationVersion } from "@opencode-ai/core/installation/version"

import { OauthCallbackPage } from "@opencode-ai/core/oauth/page"

import { createServer } from "http"

import open from "open"

const OAUTH_CLIENT_ID = "LOCAL_APPLICATION"

const OAUTH_CALLBACK_HOST = "127.0.0.1"

const OAUTH_CALLBACK_PATH = "/"

const OAUTH_TIMEOUT_MS = 5 * 60 * 1000

const ACCESS_TOKEN_REFRESH_SKEW_MS = 120_000

interface PkceCodes {

verifier: string

challenge: string

}

interface TokenResponse {

access_token: string

refresh_token?: string

expires_in?: number

token_type?: string

}

interface PendingOAuth {

account: string

state: string

pkce: PkceCodes

resolve: (tokens: TokenResponse) => void

reject: (error: Error) => void

}

let oauthServer: ReturnType<typeof createServer> | undefined

let pendingOAuth: PendingOAuth | undefined

let oauthServerPort: number | undefined

function normalizeAccount(input: string) {

return input

.trim()

.replace(/^https?:\/\//, "")

.replace(/\.snowflakecomputing\.com\/?$/, "")

.replace(/\/+$/, "")

}

function generateRandomString(length: number) {

const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~"

return Array.from(crypto.getRandomValues(new Uint8Array(length)))

.map((b) => chars[b % chars.length])

.join("")

}

function base64UrlEncode(buffer: ArrayBuffer) {

const binary = String.fromCharCode(...new Uint8Array(buffer))

return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, "")

}

async function generatePKCE(): Promise<PkceCodes> {

const verifier = generateRandomString(64)

const hash = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(verifier))

return {

verifier,

challenge: base64UrlEncode(hash),

}

function callbackUrl() {

if (!oauthServerPort) throw new Error("Snowflake OAuth callback server is not running")

return `http://${OAUTH_CALLBACK_HOST}:${oauthServerPort}${OAUTH_CALLBACK_PATH}`

}

export function oauthScope(role: string | undefined) {

if (!role) return "refresh_token"

return /^[-_A-Za-z0-9]+$/.test(role)

? `refresh_token session:role:${role}`

: `refresh_token session:role-encoded:${encodeURIComponent(role)}`

}

function authHeaders() {

return {

"Content-Type": "application/x-www-form-urlencoded",

Accept: "application/json",

"User-Agent": `opencode/${InstallationVersion}`,

}

function authBasicHeader() {

return `Basic ${Buffer.from(`${OAUTH_CLIENT_ID}:${OAUTH_CLIENT_ID}`).toString("base64")}`

}

function buildAuthorizeUrl(account: string, role: string | undefined, state: string, pkce: PkceCodes) {

const scope = oauthScope(role)

const params = new URLSearchParams({

client_id: OAUTH_CLIENT_ID,

response_type: "code",

redirect_uri: callbackUrl(),

scope,

state,

code_challenge: pkce.challenge,

code_challenge_method: "S256",

})

return `https://${account}.snowflakecomputing.com/oauth/authorize?${params.toString()}`

}

async function exchangeCodeForToken(account: string, code: string, pkce: PkceCodes) {

const response = await fetch(`https://${account}.snowflakecomputing.com/oauth/token-request`, {

method: "POST",

headers: {

...authHeaders(),

Authorization: authBasicHeader(),

body: new URLSearchParams({

grant_type: "authorization_code",

code,

redirect_uri: callbackUrl(),

client_id: OAUTH_CLIENT_ID,

code_verifier: pkce.verifier,

}).toString(),

})

if (!response.ok) {

const detail = await response.text().catch(() => "")

throw new Error(`Snowflake token exchange failed (${response.status})${detail ? `: ${detail}` : ""}`)

}

const token = (await response.json()) as TokenResponse

if (!token.access_token) throw new Error("Snowflake token response did not include access_token")

if (!token.refresh_token) {

throw new Error(

"Snowflake token response did not include refresh_token. Ensure integration issues refresh tokens and scope includes refresh_token.",

)

}

return token

}

async function refreshAccessToken(account: string, refreshToken: string) {

const response = await fetch(`https://${account}.snowflakecomputing.com/oauth/token-request`, {

method: "POST",

headers: {

...authHeaders(),

Authorization: authBasicHeader(),

body: new URLSearchParams({

grant_type: "refresh_token",

refresh_token: refreshToken,

client_id: OAUTH_CLIENT_ID,

}).toString(),

})

if (!response.ok) {

const detail = await response.text().catch(() => "")

throw new Error(`Snowflake token refresh failed (${response.status})${detail ? `: ${detail}` : ""}`)

}

const token = (await response.json()) as TokenResponse

if (!token.access_token) throw new Error("Snowflake refresh response did not include access_token")

return token

}

async function startOAuthServer() {

if (oauthServer) return

oauthServer = createServer((req, res) => {

const host = req.headers.host || `${OAUTH_CALLBACK_HOST}:${oauthServerPort ?? 0}`

const url = new URL(req.url || "/", `http://${host}`)

if (url.pathname !== OAUTH_CALLBACK_PATH) {

res.writeHead(404)

res.end("Not found")

return

}

const state = url.searchParams.get("state")

const code = url.searchParams.get("code")

const error = url.searchParams.get("error")

const errorDescription = url.searchParams.get("error_description")

// CSRF guard: validate state before processing any callback

if (!pendingOAuth || state !== pendingOAuth.state) {

const message = "Invalid state - potential CSRF attack"

pendingOAuth?.reject(new Error(message))

pendingOAuth = undefined

res.writeHead(400, { "Content-Type": "text/html" })

res.end(OauthCallbackPage.error(message, { provider: "Snowflake" }))

return

}

const current = pendingOAuth

pendingOAuth = undefined

if (error) {

const message = errorDescription || error

current.reject(new Error(message))

res.writeHead(200, { "Content-Type": "text/html" })

res.end(OauthCallbackPage.error(message, { provider: "Snowflake" }))

return

}

if (!code) {

const message = "Missing authorization code"

current.reject(new Error(message))

res.writeHead(400, { "Content-Type": "text/html" })

res.end(OauthCallbackPage.error(message, { provider: "Snowflake" }))

return

}

exchangeCodeForToken(current.account, code, current.pkce)

.then((tokens) => current.resolve(tokens))

.catch((err) => current.reject(err instanceof Error ? err : new Error(String(err))))

res.writeHead(200, { "Content-Type": "text/html" })

res.end(OauthCallbackPage.success({ provider: "Snowflake" }))

})

await new Promise<void>((resolve, reject) => {

oauthServer!.listen(0, OAUTH_CALLBACK_HOST, () => {

const address = oauthServer!.address()

if (!address || typeof address === "string") {

reject(new Error("Unable to resolve Snowflake OAuth callback port"))

return

}

oauthServerPort = address.port

resolve()

})

oauthServer!.on("error", reject)

})

}

function stopOAuthServer() {

if (!oauthServer) return

oauthServer.close()

oauthServer = undefined

oauthServerPort = undefined

}

function waitForOAuthCallback(account: string, pkce: PkceCodes, state: string): Promise<TokenResponse> {

if (pendingOAuth) {

pendingOAuth.reject(new Error("Superseded by a newer Snowflake authorize request"))

pendingOAuth = undefined

}

return new Promise((resolve, reject) => {

const timeout = setTimeout(() => {

if (!pendingOAuth) return

pendingOAuth = undefined

stopOAuthServer()

reject(new Error("Snowflake OAuth callback timeout - authorization took too long"))

}, OAUTH_TIMEOUT_MS)

pendingOAuth = {

account,

state,

pkce,

resolve: (tokens) => {

clearTimeout(timeout)

resolve(tokens)

reject: (error) => {

clearTimeout(timeout)

reject(error)

}

})

}

export async function SnowflakeCortexAuthPlugin(_input: PluginInput): Promise<Hooks> {

const prompts = [

{

type: "text" as const,

key: "account",

message: "Snowflake Account Identifier",

placeholder: "myorg-myaccount",

validate: (value: string) => (value && value.trim().length > 0 ? undefined : "Required"),

{

type: "text" as const,

key: "role",

message: "Snowflake Role (optional)",

placeholder: "PUBLIC",

]

return {

auth: {

provider: "snowflake-cortex",

async loader(getAuth, _provider) {

let auth = await getAuth()

if (auth.type !== "oauth") return {}

let refreshPromise:

| Promise<{

access: string

refresh: string

expires: number

| undefined

const oauth = auth as typeof auth & { refresh: string; access: string; expires: number; accountId?: string }

if (oauth.accountId && oauth.refresh && oauth.expires && oauth.expires <= Date.now()) {

try {

const tokens = await refreshAccessToken(oauth.accountId, oauth.refresh)

const refreshedRefresh = tokens.refresh_token || oauth.refresh

const refreshedExpires = Date.now() + (tokens.expires_in ?? 600) * 1000

await _input.client.auth

.set({

path: { id: "snowflake-cortex" },

body: {

type: "oauth",

access: tokens.access_token,

refresh: refreshedRefresh,

expires: refreshedExpires,

...(oauth.accountId && { accountId: oauth.accountId }),

})

.catch(() => {})

} catch {}

}

return {

apiKey: OAUTH_DUMMY_KEY,

async fetch(requestInput: RequestInfo | URL, init?: RequestInit) {

let currentAuth = await getAuth()

if (currentAuth.type !== "oauth") return fetch(requestInput, init)

let currentOauth = currentAuth as typeof currentAuth & {

refresh: string

access: string

expires: number

accountId?: string

}

if (!currentOauth.accountId) throw new Error("Snowflake OAuth auth is missing accountId")

const accountId = currentOauth.accountId

const refresh = async () => {

if (!refreshPromise) {

const refreshToken = currentOauth.refresh

refreshPromise = refreshAccessToken(accountId, refreshToken)

.then(async (tokens) => {

const refreshedRefresh = tokens.refresh_token || refreshToken

const refreshedExpires = Date.now() + (tokens.expires_in ?? 600) * 1000

await _input.client.auth

.set({

path: { id: "snowflake-cortex" },

body: {

type: "oauth",

access: tokens.access_token,

refresh: refreshedRefresh,

expires: refreshedExpires,

...(accountId && { accountId }),

})

.catch(() => {})

return {

access: tokens.access_token,

refresh: refreshedRefresh,

expires: refreshedExpires,

}

})

.finally(() => {

refreshPromise = undefined

})

}

const refreshed = await refreshPromise

currentOauth = { ...currentOauth, ...refreshed }

}

const prepareRequest = () => {

const headers = new Headers(requestInput instanceof Request ? requestInput.headers : undefined)

if (init?.headers) {

const entries =

init.headers instanceof Headers

? init.headers.entries()

: Array.isArray(init.headers)

? init.headers

: Object.entries(init.headers as Record<string, string | undefined>)

for (const [key, value] of entries) {

if (value !== undefined) headers.set(key, String(value))

}

headers.set("authorization", `Bearer ${currentOauth.access}`)

headers.set("User-Agent", `opencode/${InstallationVersion}`)

let body = init?.body

if (body && typeof body === "string") {

try {

const parsed = JSON.parse(body)

if ("max_tokens" in parsed) {

parsed.max_completion_tokens = parsed.max_tokens

delete parsed.max_tokens

body = JSON.stringify(parsed)

}

} catch {}

}

return { ...init, headers, body }

}

const transformResponse = async (response: Response) => {

if (!response.ok && response.status === 400) {

try {

const errorData = await response.clone().json()

const errorMessage = String(errorData.message || errorData.error || "")

if (errorMessage.toLowerCase().includes("conversation complete")) {

return new Response(

JSON.stringify({

choices: [{ finish_reason: "stop", message: { content: "", role: "assistant" } }],

}),

{ status: 200, headers: new Headers({ "content-type": "application/json" }) },

)

}

} catch {}

}

if (response.body && response.headers.get("content-type")?.includes("text/event-stream")) {

const reader = response.body.getReader()

const encoder = new TextEncoder()

const decoder = new TextDecoder()

const stream = new ReadableStream({

async pull(ctrl) {

const { done, value } = await reader.read()

if (done) {

ctrl.close()

return

}

const text = decoder.decode(value, { stream: true })

ctrl.enqueue(encoder.encode(text.replace(/"role"\s*:\s*""/g, '"role":"assistant"')))

cancel() {

reader.cancel()

})

return new Response(stream, { headers: response.headers, status: response.status })

}

return response

}

const expiresSoon =

!currentOauth.expires ||

!currentOauth.access ||

currentOauth.expires - Date.now() <= ACCESS_TOKEN_REFRESH_SKEW_MS

if (expiresSoon) await refresh()

const response = await fetch(requestInput, prepareRequest())

if (response.status === 401) {

await refresh()

return transformResponse(await fetch(requestInput, prepareRequest()))

}

return transformResponse(response)

}

methods: [

{

type: "oauth",

label: "Login with Snowflake (External Browser)",

prompts,

async authorize(inputs = {}) {

const account = normalizeAccount(inputs.account || "")

if (!account) throw new Error("Snowflake account is required")

await startOAuthServer()

const pkce = await generatePKCE()

const state = generateRandomString(64)

const role = (inputs.role || "").trim() || undefined

const url = buildAuthorizeUrl(account, role, state, pkce)

const callbackPromise = waitForOAuthCallback(account, pkce, state)

await open(url).catch(() => undefined)

return {

url,

instructions:

"Complete Snowflake sign-in in your browser. OpenCode will capture the OAuth callback and store the bearer token automatically.",

method: "auto" as const,

async callback() {

try {

const tokens = await callbackPromise

return {

type: "success" as const,

refresh: tokens.refresh_token!,

access: tokens.access_token,

expires: Date.now() + (tokens.expires_in ?? 600) * 1000,

accountId: account,

}

} catch {

return { type: "failed" as const }

} finally {

stopOAuthServer()

}

{

type: "api",

label: "Paste PAT or bearer token manually",

prompts: prompts.filter((item) => item.key === "account"),

}

opencode/packages/opencode/src/plugin/snowflake-cortex.ts at dev · argszero/opencode · GitHub

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