Add CCIP-Read Tunneling

[adraffy]

• added utils/ccipTunnel.ts and tests
  • exposes ccipReadTunnel()

---

Usage:

// <meta http-equiv="Content-Security-Policy" content="connect-src 'self' <batchGateway>;">
createClient({
   ccipRead: ccipReadTunnel({ batchGateways: [<batchGateway>] })
});

→ routes ALL CCIP-Read OffchainLookup requests through <batchGateway>.

---

Note: CCIP-Read is not ENS-specific.

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commit: 6fb38ab

[jxom]

one small nit

[adraffy]

Oh cool, does the idea make sense? It could technically be an external library since the code is independent but I think it's actually useful for frontend applications (and will get use as there's an increased desire to lock frontends down) and the new code is only a small addition.

I have a matching solution for ethers for solving the same problem (CSP).

---

This will be standardized as part of ENSIP-21 but I'm thinking about writing an ERC, since it's actually a security improvement on ERC-3668 (although ENSIP-21 itself was too, and I didn't write one.)

[adraffy]

I was unsure what to put here.

Basically, the batch gateway failed to fetch all of the URLs, so it's not clear which one gets the blame.