[翻译]：让 PW-Core 能够适配后端使用的提案（有 50000 CKB+ 的奖励！！）

中文 CKB 开发与技术讨论
2

我运行Node项目十之八九都是编译不通过的（所以，不好测试）：

屏幕截图 2021-03-05 143430
屏幕截图 2021-03-05 1434301397×982 269 KB

所以在此针对 RawProvider简单参与一下。抛砖引玉~ :grinning_face_with_smiling_eyes:

1、更新pw-core/src/hashers/blake2b-hasher.ts的构造函数，以支持传入私钥，其它不变：

constructor(key: string = null) {
    const keyData = !key || key.length === 0 ? null : Buffer.from(key);
    const h = blake2b(
      32,
      keyData,
      null,
      new Uint8Array(Reader.fromRawString('ckb-default-hash').toArrayBuffer())
    );
    super(h);
  }

gist: https://gist.github.com/taurenshaman/86f96ae81a3f26188bffa735218a70c0

2、增加文件：pw-core/src/signers/blake2b-signer.ts

import { Signer, Message } from '.';
import { Blake2bHasher } from '../hashers';
import { Provider } from '../providers';

export class Blake2bSigner extends Signer {

  constructor(public readonly provider: Provider, key: string = null) {
    super(new Blake2bHasher(key));
  }

  signMessage(message: string): Promise<string>{
    return this.provider.sign(message);
  }

  async signMessages(messages: Message[]): Promise<string[]> {
    const sigs = [];
    for (const message of messages) {
      if (
        this.provider.address.toLockScript().toHash() === message.lock.toHash()
      ) {
        sigs.push(await this.provider.sign(message.message));
      } else {
        sigs.push('0x');
      }
    }

    return sigs;
  }

}

gist: https://gist.github.com/taurenshaman/ed4dfd5019ade10e78a2dbacf24ac955

3、增加文件：pw-core/src/providers/raw-provider.ts，基于DummyProvider修改：

import { Provider, Platform } from './provider';
import { Address, AddressType } from '..';
import { Blake2bSigner } from '../signers/blake2b-signer';

export class RawProvider extends Provider {
  secret: string;
  signer: Blake2bSigner;

  sign(message: string): Promise<string> {
    console.log('message', message);
    return this.signer.signMessage(message);
  }

  constructor(secret: string, platform: Platform = Platform.ckb) {
    super(platform);
    this.secret = secret;
    this.signer = new Blake2bSigner(this, secret);
  }

   async init(): Promise<Provider> {
    if (this.platform === Platform.eth) {
      this.address = new Address(
        '0x26C5F390FF2033CbB44377361c63A3Dd2DE3121d',
        AddressType.eth
      );
    } else {
      this.address = new Address(
        'ckt1qyqxpayn272n8km2k08hzldynj992egs0waqnr8zjs',
        AddressType.ckb
      );
    }
    return this;
  }
  
  async close() {
    console.log('do nothing');
  }
}

gist: https://gist.github.com/taurenshaman/de4cb3ce973ac53799723124cb1b703b

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