Implement swaps in Solana

[bbondy]

Possibly with https://docs.jup.ag/jupiter-api-beta/using-the-api-v1

[aman-m1]

Any update/progress here @bbondy?

[bbondy]

Finishing up on Dapps then I believe this is the next biggest Solana item.

[onyb]

Technical spec

Define mojom structs to model the following jup.ag response

Unlike 0x, Jupiter returns several routes in the data array, instead of a single route. The route object in the first index is the most cost-effective one, but we can expose all the other routes for presentational purpose.

⚠️ Amounts and prices in Jupiter are not represented as strings in the JSON response.

API to fetch a quote

This is equivalent to the /swap/v1/price endpoint of 0x API.

Example	SOL -> USDC

API to build a transaction from a quote

This is equivalent to the /swap/v1/quote endpoint of 0x API.

POST https://quote-api.jup.ag/v1/swap
{
  route: routes[0],  // the route object to use
  userPublicKey: "foo" ,  // user public key to be used for the swap
  feeAccount: "xxxx"  // fees will be collected here
}

Response:
Depending on the route, the API will return between 1 to 3 transaction objects. At minimumm, swapTransaction will always be in the JSON response. The transactions must be signed and settled sequentially.

{
  setupTransaction: {...},
  swapTransaction: {...},
  cleanupTransaction: {...},
}

[onyb]

Test plan

1. Test the swap flow on Solana network => demo video in Jupiter desktop integration for Solana swaps brave-core#14298.
2. Check whether fees are received in https://solscan.io/account/8eekKfUAGSJbq3CdA2TmHb8tKuyzd5gtEas3MYAtXzrT.
3. Check whether slippage settings can be changed.
4. Check if UI displays "Insufficient liquidity" error for illiquid pairs. Ex, SOL -> wBAT
5. Verify that 0x swap is free of regressions.

[srirambv]

Verification passed on

Brave	1.44.97 Chromium: 106.0.5249.55 (Official Build) (64-bit)
Revision	4d5f098fca6ab7f4b6b7c240be3d9593c2357709-refs/branch-heads/5249@{#531}
OS	Windows 11 Version 21H2 (Build 22000.978)

• Verified test plan from #19474 (comment)
• Verified Swap flow works as shown in PR
• Verified able to successfully submit transaction for SOL -> USDC with Transaction 1/3 ,Transaction 2/3Transaction 3/3
• Verified able to change slippage charge
• Verified UI displays "Insufficient liquidity" error for illiquid pair SOL -> wBBTC
• Verified able to Swap with 0x without issues BAT -> USDC

Confirmation	Insufficient liquidity