Catching or conditionally allowing CCIP read attempts

[sealer3]

By default, ethers allows CCIP reads during ENS lookups. In Otterscan, we observed that CCIP reads were also followed during calls to provider.lookupAddress, which resolves the ENS name associated with an address. This presents a privacy issue for our application, since ENS names are looked up by default as users browse with Otterscan. Is there a way to enable CCIP reads for ENS lookups (via provider.resolveName) but disable them for provider.lookupAddress? I see that lookupAddress actually calls an ENS reverse resolver under the hood.

Alternatively - and this might be the more robust route - it would be great if there were a way for us to catch attempted CCIP read attempts which failed because CCIP reads have been disabled. This would let us conditionally allow the read after getting the user's approval. Currently, ethers discards call exceptions during ENS lookup:

ethers.js/src.ts/providers/ens-resolver.ts

Line 253 in 9fd9d41

} catch (error: any) {

If you're interested, I list a few addresses and pages which trigger CCIP reads from reverse lookups: otterscan/otterscan#3330