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linear-security-basics Secure API key management, OAuth best practices, and webhook
verification for Linear integrations.
Trigger: "linear security", "linear API key security",
"linear OAuth", "secure linear", "linear webhook verification",
"linear secrets management", "linear token refresh".
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Use when building authentication UI, customizing sign-in experience,
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Trigger with phrases like "clerk sign-in", "clerk sign-up",
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Implement session management and middleware with Clerk.
Use when managing user sessions, configuring route protection,
or implementing token refresh and custom JWT templates.
Trigger with phrases like "clerk session", "clerk middleware",
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Use when implementing SSO integration, configuring role-based permissions,
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Trigger with phrases like "clerk SSO", "clerk RBAC",
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Métiers associés SOC
Basé sur la classification professionnelle SOC
name linear-security-basics description Secure API key management, OAuth best practices, and webhook
verification for Linear integrations.
Trigger: "linear security", "linear API key security",
"linear OAuth", "secure linear", "linear webhook verification",
"linear secrets management", "linear token refresh".
allowed-tools Read, Write, Edit, Grep version 1.12.0 license MIT author Jeremy Longshore <jeremy@intentsolutions.io> tags ["saas","linear","api","security","authentication"] compatibility Designed for Claude Code, also compatible with Codex and OpenClaw
Linear Security Basics
Overview
Secure authentication patterns for Linear integrations: API key management, OAuth 2.0 with PKCE, token refresh (mandatory for new apps after Oct 2025), webhook HMAC-SHA256 signature verification, and secret rotation.
Prerequisites
Linear account with API access
Understanding of environment variables and secret management
Familiarity with OAuth 2.0 and HMAC concepts
Instructions
Step 1: Secure API Key Storage
import { LinearClient } from "@linear/sdk" ;
const client = new LinearClient ({
apiKey : process.env .LINEAR_API_KEY !,
});
Environment setup:
LINEAR_API_KEY=lin_api_xxxxxxxxxxxxxxxxxxxxxxxxxxxx
LINEAR_WEBHOOK_SECRET=whsec_xxxxxxxxxxxx
.env
.env .*
!.env.example
LINEAR_API_KEY=lin_api_your_key_here
LINEAR_WEBHOOK_SECRET=your_webhook_secret_here
Startup validation:
function validateConfig (void {
const key = process.env .LINEAR_API_KEY ;
if (!key) throw new Error ("LINEAR_API_KEY is required" );
if (!key.startsWith ("lin_api_"
throw
new
Error
"LINEAR_API_KEY has invalid format"
if
length
30
throw
new
Error
"LINEAR_API_KEY appears truncated"
validateConfig
Step 2: OAuth 2.0 with PKCE import express from "express" ;
import crypto from "crypto" ;
const app = express ();
const OAUTH = {
clientId : process.env .LINEAR_CLIENT_ID !,
clientSecret : process.env .LINEAR_CLIENT_SECRET !,
redirectUri : process.env .LINEAR_REDIRECT_URI !,
scopes : ["read" , "write" , "issues:create" ],
};
function generatePKCE (const verifier = crypto.randomBytes (32 ).toString ("base64url" );
const challenge = crypto.createHash ("sha256" ).update (verifier).digest ("base64url" );
return { verifier, challenge };
}
app.get ("/auth/linear" , (req, res ) => {
const state = crypto.randomBytes (16 ).toString ("hex" );
const { verifier, challenge } = generatePKCE ();
req.session !.oauthState = state;
req.session !.codeVerifier = verifier;
const url = new URL ("https://linear.app/oauth/authorize" );
url.searchParams .set ("client_id" , OAUTH .clientId );
url.searchParams .set ("redirect_uri" , OAUTH .redirectUri );
url.searchParams .set ("response_type" , "code" );
url.searchParams .set ("scope" , OAUTH .scopes .join ("," ));
url.searchParams .set ("state" , state);
url.searchParams .set ("code_challenge" , challenge);
url.searchParams .set ("code_challenge_method" , "S256" );
res.redirect (url.toString ());
});
app.get ("/auth/linear/callback" , async (req, res) => {
const { code, state } = req.query ;
if (state !== req.session !.oauthState ) {
return res.status (400 ).json ({ error : "Invalid state parameter" });
}
const response = await fetch ("https://api.linear.app/oauth/token" , {
method : "POST" ,
headers : { "Content-Type" : "application/x-www-form-urlencoded" },
body : new URLSearchParams ({
grant_type : "authorization_code" ,
code : code as string ,
client_id : OAUTH .clientId ,
client_secret : OAUTH .clientSecret ,
redirect_uri : OAUTH .redirectUri ,
code_verifier : req.session !.codeVerifier ,
}),
});
const tokens = await response.json ();
await storeTokens (req.user !.id , {
accessToken : encrypt (tokens.access_token ),
refreshToken : encrypt (tokens.refresh_token ),
expiresAt : new Date (Date .now () + tokens.expires_in * 1000 ),
});
res.redirect ("/dashboard" );
});
Step 3: Token Refresh As of Oct 2025, all new Linear OAuth apps issue refresh tokens. Existing apps must migrate by April 2026.
async function getValidToken (userId : string Promise <string > {
const stored = await getStoredTokens (userId);
if (stored.expiresAt .getTime () - Date .now () < 5 * 60 * 1000 ) {
const response = await fetch ("https://api.linear.app/oauth/token" , {
method : "POST" ,
headers : { "Content-Type" : "application/x-www-form-urlencoded" },
body : new URLSearchParams ({
grant_type : "refresh_token" ,
refresh_token : decrypt (stored.refreshToken ),
client_id : process.env .LINEAR_CLIENT_ID !,
client_secret : process.env .LINEAR_CLIENT_SECRET !,
}),
});
if (!response.ok ) throw new Error (`Token refresh failed: ${response.status} ` );
const tokens = await response.json ();
await storeTokens (userId, {
accessToken : encrypt (tokens.access_token ),
refreshToken : encrypt (tokens.refresh_token ),
expiresAt : new Date (Date .now () + tokens.expires_in * 1000 ),
});
return tokens.access_token ;
}
return decrypt (stored.accessToken );
}
Step 4: Webhook Signature Verification Linear signs every webhook with HMAC-SHA256 using the webhook's signing secret. The signature is in the Linear-Signature header.
import crypto from "crypto" ;
function verifyWebhookSignature (
rawBody : string ,
signature : string ,
secret : string
): boolean {
const expected = crypto
.createHmac ("sha256" , secret)
.update (rawBody)
.digest ("hex" );
try {
return crypto.timingSafeEqual (
Buffer .from (signature),
Buffer .from (expected)
);
} catch {
return false ;
}
}
app.post ("/webhooks/linear" , express.raw ({ type : "*/*" }), (req, res ) => {
const signature = req.headers ["linear-signature" ] as string ;
const rawBody = req.body .toString ();
if (!verifyWebhookSignature (rawBody, signature, process.env .LINEAR_WEBHOOK_SECRET !)) {
return res.status (401 ).json ({ error : "Invalid signature" });
}
const event = JSON .parse (rawBody);
const age = Date .now () - event.webhookTimestamp ;
if (age > 60000 ) {
return res.status (400 ).json ({ error : "Webhook too old" });
}
processEvent (event).catch (console .error );
res.json ({ received : true });
});
Step 5: Secret Rotation
const apiKeys = [
process.env .LINEAR_API_KEY_NEW ,
process.env .LINEAR_API_KEY_OLD ,
].filter (Boolean ) as string [];
async function getWorkingClient (Promise <LinearClient > {
for (const apiKey of apiKeys) {
try {
const client = new LinearClient ({ apiKey });
await client.viewer ;
return client;
} catch {
continue ;
}
}
throw new Error ("No valid Linear API key found" );
}
Security Checklist
Error Handling Error Cause Solution Invalid signatureWebhook secret mismatch Verify LINEAR_WEBHOOK_SECRET in Linear Settings > API > Webhooks invalid_grantRefresh token expired/revoked Re-initiate full OAuth flow Invalid scopeApp not authorized for scope Request only scopes your app needs Authentication requiredToken expired, refresh failed Trigger re-authentication
Examples
Test Webhook Signature Locally import crypto from "crypto" ;
const secret = "test-signing-secret" ;
const payload = JSON .stringify ({
action : "create" ,
type : "Issue" ,
data : { id : "test" , title : "Test" },
webhookTimestamp : Date .now (),
});
const sig = crypto.createHmac ("sha256" , secret).update (payload).digest ("hex" );
console .log (`Signature: ${sig} ` );
console .log (`Valid: ${verifyWebhookSignature(payload, sig, secret)} ` );
Resources 