feat: add accounts/compare endpoint

[Imod7]

Description

Closes #1591

Adds a new endpoint, accounts/compare, that compares up to 30 SS58 addresses and determines if they are equal which means that they share the same public key. Returns a boolean result along with detailed information for each address queried.

Implementation Notes

• The request should be follow one of these formats :

  • by repeating the addresses key: ?addresses=...&addresses=... or
  • by using the array style key: ?addresses[]=...&addresses[]=... or
  • by using comma-separated values: ?addresses=...,....

• The limit of 30 addresses was set to keep the character count of the request at a reasonable size/not too big.

• The additional function validateAddressQueryParamMiddleware was added to check that the addresses as query parameters were valid.

Sample Request/Response

Example request to check 4 SS58 addresses

http://127.0.0.1:8080/accounts/compare?addresses[]=1jeB5w8XyBADtgmVmwk2stWpTyfTVWEgLo85tF7gYVxnmSw&addresses[]=DJxh51wJYvcY1VhJqhnngRN7SGFZrmH4DuPKFXicFgwMQCT&addresses[]=WfwU3e9TRYo1Bi62SLrvPDe3th8jQeqd3ZnAJTczpUQCNZ8&addresses[]=cTbj3BYqiRXAF7YvyDtJHV4hNqRnbHMoz7umz6vTg4tUjCY

Example response

{
  "areEqual": true,
  "addresses": [
    {
      "ss58Format": "1jeB5w8XyBADtgmVmwk2stWpTyfTVWEgLo85tF7gYVxnmSw",
      "ss58Prefix": "0",
      "network": "polkadot",
      "publicKey": "0x20857206fde63ea508a317a77bc1ca2a795c978533b71fc7bc21d352d832637c"
    },
    {
      "ss58Format": "DJxh51wJYvcY1VhJqhnngRN7SGFZrmH4DuPKFXicFgwMQCT",
      "ss58Prefix": "2",
      "network": "kusama",
      "publicKey": "0x20857206fde63ea508a317a77bc1ca2a795c978533b71fc7bc21d352d832637c"
    },
    {
      "ss58Format": "WfwU3e9TRYo1Bi62SLrvPDe3th8jQeqd3ZnAJTczpUQCNZ8",
      "ss58Prefix": "5",
      "network": "astar",
      "publicKey": "0x20857206fde63ea508a317a77bc1ca2a795c978533b71fc7bc21d352d832637c"
    },
    {
      "ss58Format": "cTbj3BYqiRXAF7YvyDtJHV4hNqRnbHMoz7umz6vTg4tUjCY",
      "ss58Prefix": "6",
      "network": "bifrost",
      "publicKey": "0x20857206fde63ea508a317a77bc1ca2a795c978533b71fc7bc21d352d832637c"
    }
  ]
}

Additional Tests

Tested for:

• Invalid query param names (address, addressA)

  http://127.0.0.1:8080/accounts/compare?address=1jeB5w8XyBADtgmVmwk2stWpTyfTVWEgLo85tF7gYVxnmSw&addressA=DJxh51wJYvcY1VhJqhnngRN7SGFZrmH4DuPKFXicFgwMQCT
  

• No query params

  http://127.0.0.1:8080/accounts/compare
  

• 1 query param

  http://127.0.0.1:8080/accounts/compare?addresses[]=1jeB5w8XyBADtgmVmwk2stWpTyfTVWEgLo85tF7gYVxnmSw
  

• 30 addresses
• > 30 addresses
• Use a valid query param key and an invalid one

   http://127.0.0.1:8080/accounts/compare?addresses[]=1jeB5w8XyBADtgmVmwk2stWpTyfTVWEgLo85tF7gYVxnmSw&addressA=DJxh51wJYvcY1VhJqhnngRN7SGFZrmH4DuPKFXicFgwMQCT
  

• Correct query param name but no address value

  http://127.0.0.1:8080/accounts/compare?addresses[]=
  

[filvecchiato]

LGTM!

[TarikGul]

Very solid! Great Job