3. Directory Structure

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1
|-- contracts
2
|-- migrations
3
|-- truffle.js
4
|-- static
5
|-- src
6
    |-- klaytn
7
      |-- caver.js
8
      |-- KlaystagramContract.js
9
    |-- redux
10
    |-- pages
11
      |-- AuthPage.js
12
      |-- FeedPage.js
13
    |-- components
14
      |-- UploadPhoto.js
15
      |-- Feed.js
16
      |-- TransferOwnership.js
17
      |-- ...
18
    |-- styles
19
    |-- utils
20
    |-- index.js
21
    |-- App.js
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contracts/: Contains Solidity contract files.
migrations/: Contains JavaScript files that handle smart contract deployments.
truffle.js: Contains Truffle configurations.
src/klaytn: Contains files that support interaction with the Klaytn.
src/klaytn/caver.js: Instantiates caver-js within the configured settings.
cf) caver-js is a RPC call library which makes connections to the Klaytn node, interacts with the nodes and smart contracts deployed on Klaytn.
src/klaytn/Klaystagram.js: Creates an instance of the contract using the caver-js API. You can interact with the contract through the instance.
src/redux: Creates API functions that interact with the contract and keep track of consequent data.
src/pages: Contains two page files that compose Klaystagram app.
src/pages/AuthPage.js: Contains sign up and login form. You can generate private key in the sign up form and use it to login on the app.
src/pages/FeedPage.js: Reads photo data from the contract and show them to users. Also users can upload their pictures in FeedPage.
src/components: Contains component files that compose page.
src/components/Feed.js: Reads data from contract and displays photos
src/components/UploadPhoto.js: Uploads photo by sending transaction to contract
src/components/TransferOwnership.js: Transfers photo's ownership by sending transaction
src/components: Contains frontend component files.
src/styles: Overall style definition regarding stylesheet
static/: Contains static files, such as images and fonts.
src/index.js: App's index file. ReactDOM.render logic is in here.
src/App.js: App's root component file.
2. Clone Klaystagram BApp
4. Write Klaystagram Smart Contract
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