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import {
Issuer,
type BaseClient,
type UserinfoResponse,
type TokenSet,
custom,
} from "openid-client";
import { addHours, addWeeks } from "date-fns";
import { env } from "$env/dynamic/private";
import { sha256 } from "$lib/utils/sha256";
import { z } from "zod";
import { dev } from "$app/environment";
import type { Cookies } from "@sveltejs/kit";
import { collections } from "$lib/server/database";
import JSON5 from "json5";
import { logger } from "$lib/server/logger";
export interface OIDCSettings {
redirectURI: string;
}
export interface OIDCUserInfo {
token: TokenSet;
userData: UserinfoResponse;
}
const stringWithDefault = (value: string) =>
z
.string()
.default(value)
.transform((el) => (el ? el : value));
export const OIDConfig = z
.object({
CLIENT_ID: stringWithDefault(env.OPENID_CLIENT_ID),
CLIENT_SECRET: stringWithDefault(env.OPENID_CLIENT_SECRET),
PROVIDER_URL: stringWithDefault(env.OPENID_PROVIDER_URL),
SCOPES: stringWithDefault(env.OPENID_SCOPES),
NAME_CLAIM: stringWithDefault(env.OPENID_NAME_CLAIM).refine(
(el) => !["preferred_username", "email", "picture", "sub"].includes(el),
{ message: "nameClaim cannot be one of the restricted keys." }
),
TOLERANCE: stringWithDefault(env.OPENID_TOLERANCE),
RESOURCE: stringWithDefault(env.OPENID_RESOURCE),
ID_TOKEN_SIGNED_RESPONSE_ALG: z.string().optional(),
})
.parse(JSON5.parse(env.OPENID_CONFIG || "{}"));
export const requiresUser = !!OIDConfig.CLIENT_ID && !!OIDConfig.CLIENT_SECRET;
const sameSite = z
.enum(["lax", "none", "strict"])
.default(dev || env.ALLOW_INSECURE_COOKIES === "true" ? "lax" : "none")
.parse(env.COOKIE_SAMESITE === "" ? undefined : env.COOKIE_SAMESITE);
const secure = z
.boolean()
.default(!(dev || env.ALLOW_INSECURE_COOKIES === "true"))
.parse(env.COOKIE_SECURE === "" ? undefined : env.COOKIE_SECURE === "true");
export function refreshSessionCookie(cookies: Cookies, sessionId: string) {
cookies.set(env.COOKIE_NAME, sessionId, {
path: "/",
// So that it works inside the space's iframe
sameSite,
secure,
httpOnly: true,
expires: addWeeks(new Date(), 2),
});
}
export async function findUser(sessionId: string) {
const session = await collections.sessions.findOne({ sessionId });
if (!session) {
return null;
}
return await collections.users.findOne({ _id: session.userId });
}
export const authCondition = (locals: App.Locals) => {
return locals.user
? { userId: locals.user._id }
: { sessionId: locals.sessionId, userId: { $exists: false } };
};
/**
* Generates a CSRF token using the user sessionId. Note that we don't need a secret because sessionId is enough.
*/
export async function generateCsrfToken(sessionId: string, redirectUrl: string): Promise<string> {
const data = {
expiration: addHours(new Date(), 1).getTime(),
redirectUrl,
};
return Buffer.from(
JSON.stringify({
data,
signature: await sha256(JSON.stringify(data) + "##" + sessionId),
})
).toString("base64");
}
async function getOIDCClient(settings: OIDCSettings): Promise<BaseClient> {
const issuer = await Issuer.discover(OIDConfig.PROVIDER_URL);
const client_config: ConstructorParameters<typeof issuer.Client>[0] = {
client_id: OIDConfig.CLIENT_ID,
client_secret: OIDConfig.CLIENT_SECRET,
redirect_uris: [settings.redirectURI],
response_types: ["code"],
[custom.clock_tolerance]: OIDConfig.TOLERANCE || undefined,
id_token_signed_response_alg: OIDConfig.ID_TOKEN_SIGNED_RESPONSE_ALG || undefined,
};
const alg_supported = issuer.metadata["id_token_signing_alg_values_supported"];
if (Array.isArray(alg_supported)) {
client_config.id_token_signed_response_alg ??= alg_supported[0];
}
return new issuer.Client(client_config);
}
export async function getOIDCAuthorizationUrl(
settings: OIDCSettings,
params: { sessionId: string }
): Promise<string> {
const client = await getOIDCClient(settings);
const csrfToken = await generateCsrfToken(params.sessionId, settings.redirectURI);
return client.authorizationUrl({
scope: OIDConfig.SCOPES,
state: csrfToken,
resource: OIDConfig.RESOURCE || undefined,
});
}
export async function getOIDCUserData(
settings: OIDCSettings,
code: string,
iss?: string
): Promise<OIDCUserInfo> {
const client = await getOIDCClient(settings);
const token = await client.callback(settings.redirectURI, { code, iss });
const userData = await client.userinfo(token);
return { token, userData };
}
export async function validateAndParseCsrfToken(
token: string,
sessionId: string
): Promise<{
/** This is the redirect url that was passed to the OIDC provider */
redirectUrl: string;
} | null> {
try {
const { data, signature } = z
.object({
data: z.object({
expiration: z.number().int(),
redirectUrl: z.string().url(),
}),
signature: z.string().length(64),
})
.parse(JSON.parse(token));
const reconstructSign = await sha256(JSON.stringify(data) + "##" + sessionId);
if (data.expiration > Date.now() && signature === reconstructSign) {
return { redirectUrl: data.redirectUrl };
}
} catch (e) {
logger.error(e);
}
return null;
}
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