openethereum/js/src/redux/providers/imagesReducer.js

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

import { handleActions } from 'redux-actions';
import { bytesToHex } from '../../api/util/format';

const ZERO = '0x0000000000000000000000000000000000000000000000000000000000000000';

const initialState = {
  images: {}
};

export function hashToImageUrl (hashArray) {
  const hash = hashArray ? bytesToHex(hashArray) : ZERO;

  return hash === ZERO ? null : `/api/content/${hash.substr(2)}`;
}

export default handleActions({
  setAddressImage (state, action) {
    const { address, hashArray, converted } = action;

    const image = converted ? hashArray : hashToImageUrl(hashArray);

    return Object.assign({}, state, {
      [address]: image
    });
  }
}, initialState);