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shohu avatar shohu commented on August 29, 2024

Building your first network.

手順

genesis block作成

$ brew tap hyperledger/fabric
$ brew install [email protected]
$ cd first-network/
$ ./byfn.sh generate
Generating certs and genesis block for channel 'mychannel' with CLI timeout of '10' seconds and CLI delay of '3' seconds
Continue? [Y/n] Y
proceeding ...

network起動

$ ./byfn.sh up -l node
: 
===================== Query successful on peer1.org2 on channel 'mychannel' =====================

========= All GOOD, BYFN execution completed ===========


 _____   _   _   ____
| ____| | \ | | |  _ \
|  _|   |  \| | | | | |
| |___  | |\  | | |_| |
|_____| |_| \_| |____/

network確認

$ docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
345482a3b516        bridge              bridge              local
26a5f2507ed8        host                host                local
4c6dd88934d6        net_byfn            bridge              local

備考

cryptogen tool not found. exiting

How do I resolve the error on hyperledger fabric?

$ brew tap hyperledger/fabric
$ brew install [email protected]

で cryptogen をインストール

Failed to reach implicit threshold of 1 sub-policies, required 1 remaining: permission denied

以下でnetworkを削除してから

$ ./byfn.sh down

再度

$ ./byfn.sh up -l node

from estate-sample.

shohu avatar shohu commented on August 29, 2024

How to sign a transaction by an identity's private key

以下手順のtestソース
https://github.com/hyperledger/fabric-sdk-node/blob/release-1.4/test/integration/signTransactionOffline.js

1. unsigned transaction proposalを作成。

この PEM encoded certificate content は、pemファイルの文字列をそのまま入れればOK？

const certPem = '<PEM encoded certificate content>';
const mspId = 'Org1MSP'; // the msp Id for this org

const transactionProposal = {
    fcn: 'move',
    args: ['a', 'b', '100'],
    chaincodeId: 'mychaincodeId',
    channelId: 'mychannel',
};
const { proposal, txId } = channel.generateUnsignedProposal(transactionProposal, mspId, certPem);
// now we have the 'unsigned proposal' for this transaction

2. バイト数計算。 calculate the hash of the transaction proposal bytes.

hashFunctionは sha256D とかにしておけばいいだか。

const proposalBytes = proposal.toBuffer(); // the proposal comes from step 1
const hashFunction = xxxx; // A hash function by the user's desire
const digest = hashFunction(proposalBytes); // calculate the hash of the proposal bytes

3. 署名計算 - calculate the signature for this transaction proposal

// This is a sample code for signing the digest from step 2 with EC.
// Different signature algorithm may have different interfaces

const elliptic = require('elliptic');
const { KEYUTIL } = require('jsrsasign');

const privateKeyPEM = '<The PEM encoded private key>';
const { prvKeyHex } = KEYUTIL.getKey(privateKeyPEM); // convert the pem encoded key to hex encoded private key

const EC = elliptic.ec;
const ecdsaCurve = elliptic.curves['p256'];

const ecdsa = new EC(ecdsaCurve);
const signKey = ecdsa.keyFromPrivate(prvKeyHex, 'hex');
const sig = ecdsa.sign(Buffer.from(digest, 'hex'), signKey);

// now we have the signature, next we should send the signed transaction proposal to the peer
const signature = Buffer.from(sig.toDER());
const signedProposal = {
    signature,
    proposal_bytes: proposalBytes,
};

4. 署名されたProposalをpeerに送信

const sendSignedProposalReq = { signedProposal, targets };
const proposalResponses = await channel.sendSignedProposal(sendSignedProposalReq);
// check the proposal responses, if all good, commit the transaction

5. unsigned transactionを作成

const commitReq = {
    proposalResponses,
    proposal,
};

const commitProposal = await channel.generateUnsignedTransaction(commitReq);

6. transactionを署名

const signedCommitProposal = signProposal(commitProposal);

7. 署名transactionをcommitする

const response = await channel.sendSignedTransaction({
    signedProposal: signedCommitProposal,
    request: commitReq,
});

// response.status should be 'SUCCESS' if the commit succeed

8. ChannelEventHub用の eventhub registrationを作成 - generate an unsigned eventhub registration for the ChannelEventHub.

const unsignedEvent = eh.generateUnsignedRegistration({
    certificate: certPem,
    mspId,
});

9. eventhub registrationを署名 - sign the unsigned eventhub registration with the user's private key

const signedProposal = signProposal(unsignedEvent);
const signedEvent = {
    signature: signedProposal.signature,
    payload: signedProposal.proposal_bytes,
};

10. このChannelEventHubをPeerに登録

channelEventHub.connect({signedEvent});

from estate-sample.

shohu avatar shohu commented on August 29, 2024

Front の Vue を動かす

https://github.com/hyperledger/fabric-sdk-node/blob/release-1.4/test/integration/signTransactionOffline.js

以下ページを参考にした
https://qiita.com/sin_tanaka/items/6d5d9089eb76dda4ce88

1. ネットワーク起動しておく

#9 (comment)

2. Dockerコンテナ作成

Dockerfile

FROM node:8.16

COPY . /front
WORKDIR /front

RUN npm install -g vue vue-cli

docker-compose.yaml

version: '2'

networks:
  basic:
    external:
      name: net_byfn

services:
  front:
    container_name: estatefront
    image: estate/front
    build:
      context: ./front
    tty: true
    ports:
        - 13333:8080
    volumes:
        - ./front:/front
    networks:
        - basic

3. vue sampleアプリ作成

# vue init webpack tutorial_vuejs_todo_management

? Project name todo
? Project description todo
? Author shohu
? Vue build standalone
? Install vue-router? Yes
? Use ESLint to lint your code? Yes
? Pick an ESLint preset Standard
? Set up unit tests Yes
? Pick a test runner jest
? Setup e2e tests with Nightwatch? Yes
? Should we run `npm install` for you after the project has been created? (recommended) npm

4. 起動

./tutorial_vuejs_todo_management/build/webpack.dev.conf.js
に以下を追加。macからcontainerにアクセス可能にするため

  devServer: {
    : 
    host: '0.0.0.0',
    disableHostCheck: true
  },

そのあとに起動

$ npm run dev

5. 確認

http://localhost:13333/#/

スクリーンショット 2019-06-12 16 15 41

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shohu avatar shohu commented on August 29, 2024

Vueでjsを呼び出すところまで

これやったら、fabricのjs呼び出せるか試してみる。

Vue.jsで外部jsファイルを読み込んで関数を呼び出す方法

調査

以下のようにbrowserのconsoleでエラーが出てしまう。
どうも、fsモジュールが fabric 内で使われていてそれが webpack で読み込めないって言われてるっぽい

file.js?7907:152 Uncaught TypeError: existsSync is not a function
    at exports.File.File.loadSync (file.js?7907:152)
    at exports.Provider.Provider.add (provider.js?5961:136)
    at exports.Provider.Provider.file (provider.js?5961:63)
    at Config.reorderFileStores (Config.js?a0b0:71)
    at Object.eval (FabricCAServices.js?47f9:25)
    at eval (FabricCAServices.js:449)
    at Object../node_modules/fabric-ca-client/lib/FabricCAServices.js (app.js:2095)
    at __webpack_require__ (app.js:679)
    at fn (app.js:89)
    at eval (index.js?0171:23)

NodeJS (Webpack): fs.existsSync is not a function

結論

Browserifyで"fs.readFileSync is not a function"

web で fs モジュールはロードできない

node.js ベースのlibは browserでは使えないので、fabric を vue でやるのは無理っぽい。
このため、API側でやる部分とClient側でやる部分をもう少し検討する必要がある。

少なくとも hyperledgerのlib使っているものは api側でやらないといけないようだ。

ただ、

const { proposal, txId } = channel.generateUnsignedProposal(transactionProposal, mspId, certPem);

の時点で秘密鍵をAPI側にわたさなければいけない、、、

備考

sass install

$ npm install sass-loader node-sass --save-dev

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shohu avatar shohu commented on August 29, 2024

ブラウザから呼び出すのは難しいのでモバイル端末ならOK？

Reactnativeならjs使えるっぽいな、、、これならば端末内に 秘密鍵 保持したままCAなどとやりとりできる。
https://qiita.com/takehiro224/items/d60243820b069197e4ba

あ、でもFlutterからjsライブラリ呼び出せるんだ。
Hummingbird: FlutterでWebアプリを作る構想

FlutterからDartライブラリを呼び出すことはもちろん全く問題ない。FlutterからJavaScriptライブラリを呼び出すには、package:jsとdart:jsを利用する。

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