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added whitelist to cors docs #1245

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added whitelist to cors docs #1245

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13 changes: 10 additions & 3 deletions docs/docs/security/cors.md
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Expand Up @@ -59,12 +59,19 @@ If your API requires a token to be sent in the `Authorization` header, then the

## CORS Requests and Cookies

If your API uses cookies (for authentication for example), then you should specify it in the hook with the `Access-Control-Allow-Credentials` header.
If your API uses cookies (for authentication for example), then you should specify it in the hook with the `Access-Control-Allow-Credentials` header. You should use a whitelist of allowed origins in this case.

```typescript
@Hook(ctx => response => {
response.setHeader('Access-Control-Allow-Origin', ctx.request.get('Origin') || '*');
response.setHeader('Access-Control-Allow-Credentials', 'true');
const whitelist = ['http://localhost:8000']; // get this data from Config / Env
const origin = ctx.request.get('Origin') || 'null';
if (whitelist.includes(origin)) {
response.setHeader('Access-Control-Allow-Origin', origin);
response.setHeader('Access-Control-Allow-Credentials', 'true');
} else {
response.setHeader('Access-Control-Allow-Origin', '*');
response.setHeader('Access-Control-Allow-Credentials', 'false');
}
})
```

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