Osmosis analyzer

[Pitasi]

Like for #266, we can implement a smart contract that takes the binary payload representing an osmosis transactions and returns the "data_for_signing" (i.e. the hash to be signed).

Basically we need to reimplement this logic in Rust: https://github.com/warden-protocol/wardenprotocol/blob/2787d9d988d067dce0fafd6d45615837881b0d7f/warden/x/warden/types/v1beta2/sign_method_handler_osmosis.go#L24-L41.

[Pitasi]

steps:

• cp -r contracts/contracts/ethereum-analyzer contracts/contracts/osmosis-analyzer
• rename all ethereum-analyzer occurences into osmosis-analyzer
• change ethereum.rs to osmosis.rs and change the parse(bytes: Binary) to parse the input as a json and return a new struct called OsmosisTransaction
• the OsmosisTransaction struct must have a signature_hash field that is calculated as sha256sum(sorted_json) where sorted_json is the json serialized with all the fields sorted alphabetically by keys and without any extra space in it
• change analyze(input: Binary) in contract.rs to return an AnalyzeResult that contains the signature_hash describe in the previous step

test case:

• add a unit test to osmosis.rs's parse() function with this case: input:

  {
  "chain_id": "osmosis-1",
  "account_number": "2037934",
  "sequence": "0",
  "fee": {
  "gas": "583061",
  "amount": [
    {
      "amount": "259",
      "denom": "ibc/27394FB092D2ECCD56123C74F36E4C1F926001CEADA9CA97EA622B25F41E5EB2"
    }
  ]
  },
  "msgs": [
  {
    "type": "osmosis/poolmanager/swap-exact-amount-in",
    "value": {
      "sender": "osmo16hmn8nh3fn79ce53fxdmp6p7fpp4mdnc3t80dw",
      "routes": [
        {
          "pool_id": "1400",
          "token_out_denom": "uosmo"
        }
      ],
      "token_in": {
        "denom": "ibc/27394FB092D2ECCD56123C74F36E4C1F926001CEADA9CA97EA622B25F41E5EB2",
        "amount": "500000"
      },
      "token_out_min_amount": "4227660"
    }
  }
  ],
  "memo": "FE",
  "timeout_height": "14705680"
  }

expected signature_hash (hex encoded for showing here on github):

858a2e13af1c1d6a89357d2408fa68a6e17fa5a97437c95c44fafae1746bc203

[AzraelSec]

Hello @Pitasi 👋🏻 May I take care of this issue?