Decoding block endpoint response with evidences failed

[yihuang]

$ tendermint version
0.33.4-70a4b5ea

The evidence in block response is a JSON object, while the code expects a base64 encoded string.

The problematic block endpoint response with evidence in it:

{
  "jsonrpc": "2.0",
  "id": -1,
  "result": {
    "block_id": {
      "hash": "649A276C615AD3B922A620ADBE5484DE9D87E2154469AE8F90DC40769350A52B",
      "parts": {
        "total": "1",
        "hash": "D2A0D52E67AAD464122612577AD80049D785BC4DB9D0A992FC143C276B2B65DB"
      }
    },
    "block": {
      "header": {
        "version": {
          "block": "10",
          "app": "0"
        },
        "chain_id": "test-chain-y3m1e6-AB",
        "height": "22",
        "time": "2020-04-28T15:48:20.640286Z",
        "last_block_id": {
          "hash": "B5F14F439A73EBDF8EF5222C957CFE6E15C95EE825C8B22E423464E675278C47",
          "parts": {
            "total": "1",
            "hash": "C5A0FADCFFF5A69D088DE7BB6836C9C5DB7955B549509E548C296D2C099D2D5D"
          }
        },
        "last_commit_hash": "6494B45CF9B18F150FE20D77DBFC598592E4B2B559071FA1E7346274A5AA544F",
        "data_hash": "",
        "validators_hash": "8AE7D181D0574535850924934C0B1B5BBB5E82F29B99B37A4BA6EBC92F0D97C9",
        "next_validators_hash": "8AE7D181D0574535850924934C0B1B5BBB5E82F29B99B37A4BA6EBC92F0D97C9",
        "consensus_hash": "048091BC7DDC283F77BFBF91D73C44DA58C3DF8A9CBC867405D8B7F3DAADA22F",
        "app_hash": "48685380CBC6D4C0B31D9A226912FA6D72B4F0C7B3EE84000222D5AE0469AA8E",
        "last_results_hash": "",
        "evidence_hash": "CBC5FBCE18AE8A6043B9C64F913F708D641E58B811CD1B5BA03D2F6D0054DA0E",
        "proposer_address": "9642515585D8F27423CE1BDDB91CD076862AFC63"
      },
      "data": {
        "txs": null
      },
      "evidence": {
        "evidence": [
          {
            "type": "tendermint/DuplicateVoteEvidence",
            "value": {
              "PubKey": {
                "type": "tendermint/PubKeyEd25519",
                "value": "MjQn17Z4VocTjeHm60JVjPV9A6hUTKYSNDTpQiglXlY="
              },
              "VoteA": {
                "type": 1,
                "height": "21",
                "round": "0",
                "block_id": {
                  "hash": "86EB9FCF52C4A81F2445157B0BF7AFBB107DF156D0853F38A019200F69465883",
                  "parts": {
                    "total": "1",
                    "hash": "B8F7219F14CB9EAA167A4E56FC8D2D4F3545C93A04357B33C34121C801D7E4F2"
                  }
                },
                "timestamp": "2020-04-28T15:48:20.368551Z",
                "validator_address": "0F1F93CC25A6CFC083F54E4DA26F73B7F24DC85B",
                "validator_index": "0",
                "signature": "JDVzUjWVP9qWZJpKmN14FvmS4mXoLnwW7C1UjFtNQrVTQpL+ONg+IkYKGzVTDQtpOcGDbOLC2dbKvY/OToaWDA=="
              },
              "VoteB": {
                "type": 1,
                "height": "21",
                "round": "0",
                "block_id": {
                  "hash": "B5F14F439A73EBDF8EF5222C957CFE6E15C95EE825C8B22E423464E675278C47",
                  "parts": {
                    "total": "1",
                    "hash": "C5A0FADCFFF5A69D088DE7BB6836C9C5DB7955B549509E548C296D2C099D2D5D"
                  }
                },
                "timestamp": "2020-04-28T15:48:20.354851Z",
                "validator_address": "0F1F93CC25A6CFC083F54E4DA26F73B7F24DC85B",
                "validator_index": "0",
                "signature": "gT2fdleX4BUzbAuUDazkbJBJ99HX7YgSTml7rumzWAm4hlOWtBGPe9BmkUF6Ypy8kzgMU/0P0D96KxCts5tpCQ=="
              }
            }
          }
        ]
      },
      "last_commit": {
        "height": "21",
        "round": "0",
        "block_id": {
          "hash": "B5F14F439A73EBDF8EF5222C957CFE6E15C95EE825C8B22E423464E675278C47",
          "parts": {
            "total": "1",
            "hash": "C5A0FADCFFF5A69D088DE7BB6836C9C5DB7955B549509E548C296D2C099D2D5D"
          }
        },
        "signatures": [
          {
            "block_id_flag": 2,
            "validator_address": "0F1F93CC25A6CFC083F54E4DA26F73B7F24DC85B",
            "timestamp": "2020-04-28T15:48:20.640286Z",
            "signature": "XMPZyI/KX9qTS6R3y4zz2tBwHFyII7VqqRj0D9vrLonIJffOsqU2m6Hk0mkcZmce9YUUi0BPHybfGn+li7goDg=="
          },
          {
            "block_id_flag": 2,
            "validator_address": "9642515585D8F27423CE1BDDB91CD076862AFC63",
            "timestamp": "2020-04-28T15:48:20.570401Z",
            "signature": "jieW+dsiGgQUTAG7LjdJQqomvrPyQR707HzOhXlUHaZ73xXRQxSpWXNZvWcqP8LwcNF2+ho5yt6NoAmYoCWPCQ=="
          }
        ]
      }
    }
  }
}