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OAuth 2.0 lets users authorize your application to act on their behalf. Corsair handles the entire flow — generating authorization URLs, processing callbacks, storing tokens encrypted, and refreshing them automatically when they expire.

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How it works

  1. You register an OAuth app with the service and get a client_id and client_secret
  2. Corsair generates an authorization URL for the user to visit
  3. After the user approves, the service redirects back with an authorization code
  4. Corsair exchanges the code for access and refresh tokens and stores them encrypted
  5. On every API call, Corsair checks token expiry and refreshes automatically
corsair.ts
import { createCorsair } from "corsair";
import { gmail } from "@corsair-dev/gmail";

export const corsair = createCorsair({
    plugins: [gmail({ authType: "oauth_2" })],
    kek: process.env.CORSAIR_KEK!,
});

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Solo setup

Solo mode connects a single account to your application. Use this for scripts, internal tools, or apps that only ever connect one account.
corsair.ts
export const corsair = createCorsair({
    plugins: [gmail({ authType: "oauth_2" })],
    kek: process.env.CORSAIR_KEK!,
});
Store your OAuth app credentials, then start the flow: 
pnpm corsair setup --plugin=gmail client_id=your-client-id client_secret=your-client-secret
pnpm corsair auth --plugin=gmail
The CLI prints an authorization URL. Open it in a browser, approve, and tokens are stored automatically. After that, all API calls use your connected account:
usage.ts
const messages = await corsair.gmail.api.messages.list({ maxResults: 10 });
Tokens are refreshed automatically when they expire — no intervention needed.

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Multi-tenant setup

In multi-tenant mode, each user connects their own account. You need an OAuth callback route in your application that Corsair processes.
corsair.ts
export const corsair = createCorsair({
    multiTenancy: true,
    plugins: [gmail({ authType: "oauth_2" })],
    kek: process.env.CORSAIR_KEK!,
});

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1. Store your OAuth app credentials

Store your client credentials once — these are shared across all tenants: 
pnpm corsair setup --plugin=gmail client_id=your-client-id client_secret=your-client-secret

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2. Generate the authorization URL

When a user wants to connect their account, redirect them to the authorization URL:
app/api/connect/gmail/route.ts
import { getOAuthUrl } from "corsair";
import { corsair } from "@/server/corsair";
import { redirect } from "next/navigation";

export async function GET(request: Request) {
    const tenantId = getUserIdFromSession(request); // your auth logic

    const url = await getOAuthUrl(corsair, "gmail", { tenantId });
    return redirect(url);
}

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3. Handle the callback

After the user approves, the service redirects to your callback URL. Process it with Corsair:
app/api/oauth/callback/route.ts
import { handleOAuthCallback } from "corsair";
import { corsair } from "@/server/corsair";
import { redirect } from "next/navigation";

export async function GET(request: Request) {
    const url = new URL(request.url);
    const code = url.searchParams.get("code");
    const state = url.searchParams.get("state"); // contains tenantId

    await handleOAuthCallback(corsair, "gmail", { code, state });
    return redirect("/dashboard?connected=gmail");
}
Corsair extracts the tenantId from the state parameter, exchanges the code for tokens, and stores them encrypted for that tenant.

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4. Make API calls per tenant

usage.ts
const tenant = corsair.withTenant("user_abc123");

// Uses user_abc123's connected account
const messages = await tenant.gmail.api.messages.list({ maxResults: 10 });

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Automatic token refresh

OAuth access tokens expire (typically after 1 hour). Corsair checks token expiry before every API call and refreshes automatically using the stored refresh token. Your code never needs to handle token expiry. See Authentication for more details.