add verification submission comment

[ayrat555]

resolves #2575

Motivation

Changelog

• add verification submission comment

[coveralls]

Pull Request Test Coverage Report for Build 1ad0234c-aadd-42a8-b27d-1c19a3fd5308

• 1 of 25 (4.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 78.362%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/explorer/lib/explorer/chain.ex	0	8	0.0%
apps/explorer/lib/explorer/chain/smart_contract.ex	0	16	0.0%

Totals
Change from base Build c4335717-4c12-4c44-923d-4543a849ca4c:	-0.3%
Covered Lines:	5146
Relevant Lines:	6567

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💛 - Coveralls

[vbaranov]

@ayrat555 does the feature check that submission comment was not added previously?

[ayrat555]

@vbaranov we don't save the comment to the DB so the contract will have only one comment

[vbaranov]

@ayrat555 user can copy source code from another verified contract in Blockscout. In this case there will be doubled submission comments. Isn’t it?

[ayrat555]

@vbaranov I added handling of all 4 cases
https://github.com/poanetwork/blockscout/pull/2588/files#diff-1bc9df57fc4a868238834dcfa8cc3520R292

[vbaranov]

@ayrat555

please check on stg all cases.

/address/0xb4bba71e32c3628f0896639da4c5364519a8ca08/contracts
Internal server error

** (exit) an exception was raised:
    ** (FunctionClauseError) no function clause matching in List.replace_at/3
        (elixir) lib/list.ex:637: List.replace_at(["/**\r", " *Submitted for verification at Etherscan.io on 2017-10-17\r", "*/\r", "\r", "pragma solidity ^0.4.11;\r", "/**\r", " * @title ERC20Basic\r", " * @dev Simpler version of ERC20 interface\r", " * @dev see https://github.com/ethereum/EIPs/issues/179\r", " */\r", "contract ERC20Basic {\r", "  uint256 public totalSupply;\r", "  function balanceOf(address who) public constant returns (uint256);\r", "  function transfer(address to, uint256 value) public returns (bool);\r", "  event Transfer(address indexed from, address indexed to, uint256 value);\r", "}\r", "/**\r", " * @title Ownable\r", " * @dev The Ownable contract has an owner address, and provides basic authorization control\r", " * functions, this simplifies the implementation of \"user permissions\".\r", " */\r", "contract Ownable {\r", "  address public owner;\r", "  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\r", "  /**\r", "   * @dev The Ownable constructor sets the original `owner` of the contract to the sender\r", "   * account.\r", "   */\r", "  function Ownable() {\r", "    owner = msg.sender;\r", "  }\r", "  /**\r", "   * @dev Throws if called by any account other than the owner.\r", "   */\r", "  modifier onlyOwner() {\r", "    require(msg.sender == owner);\r", "    _;\r", "  }\r", "  /**\r", "   * @dev Allows the current owner to transfer control of the contract to a newOwner.\r", "   * @param newOwner The address to transfer ownership to.\r", "   */\r", "  function transferOwnership(address newOwner) onlyOwner public {\r", "    require(newOwner != address(0));\r", "    OwnershipTransferred(owner, newOwner);\r", "    owner = newOwner;\r", "  }\r", "}\r", "/**\r", " * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\r", ...], " *Submitted for verification at Etherscan.io on 2017-10-17\r", "* Submitted for verification at blockscout.com on 2019-07-09 11:45:55.418058Z")
        (block_scout_web) lib/block_scout_web/views/address_contract_view.ex:70: BlockScoutWeb.AddressContractView.contract_lines_with_index/2
        (block_scout_web) lib/block_scout_web/templates/address_contract/index.html.eex:69: BlockScoutWeb.AddressContractView."index.html"/1
        (block_scout_web) lib/block_scout_web/templates/layout/app.html.eex:50: BlockScoutWeb.LayoutView."app.html"/1
        (phoenix) lib/phoenix/view.ex:399: Phoenix.View.render_to_iodata/3
        (phoenix) lib/phoenix/controller.ex:729: Phoenix.Controller.__put_render__/5
        (block_scout_web) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint.instrument/4
        (phoenix) lib/phoenix/controller.ex:746: Phoenix.Controller.instrument_render_and_send/4

[ayrat555]

@vbaranov I fixed it

[vbaranov]

@vbaranov I fixed it

@ayrat555 it still causes internal server error. You can check with the address I previously posted. Please check logs of stg application.

[ayrat555]

@vbaranov It loads successfully with staging-mainnet-stg branch