Ethereum wallet web github

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We provide a number of features that attempt to catch a number of potentially costly mistakes that other wallets do not: trying to call a function at an address that isn't actually a contract, sending a token to the token's own contract, specifying a gas limit that is too low. Inspired by popular block explorers, we also give users a window into what potentially will happen when a transaction lands on the blockchain by showing the token transfers all before the transaction is even signed.

Many other Ethereum wallets do not adequately take advantage of the rich information afforded by a smart contract enabled blockchain. We hope that our innovations in wallet design spur new growth and interest into making Ethereum and other EVM-compatible blockchains more usable.

You have to reload the extension in the browser after every build. Both types of browsers have a "reload" button that does this. Enabling the log tracer Our wallet has a special feature that lets users view the probable token transfers emitted by a transaction prior to the transaction actually being sent.

It does not use Saga. We separated it into a new container to reduce clustering the state of the homepage container. TokenChooser container Token Chooser appears when the user wants to select what token the wallet will manage. The Ethereum wallet was designed with a unified design approach in mind. Under the hood, the API for sending Ether and sending tokens is quite different.

So is checking the balance, but they will appear the same on the GUI. To send Ether, we need to use native functions provided by the web3. More on this issue later. Redux and Redux-Saga Using Redux store as a single source of truth greatly benefits the wallet.

GUI actions and user-triggered flows can be relatively easily managed by actions and reducers provided by Redux. Aside from keeping the UI state, the Redux store also holds the key-store object a partially encrypted JavaScript object supplied by eth-lightwallet. This makes the keystore accessible throughout the app by using a selector. Redux-Saga is what makes the entire setup shine. In the case of Ethereum wallet, by using Saga we get a comfortable way to handle asynchronous actions such as rest API calls, keystore actions, Ethereum blockchain calls via web3.

All the requests are cleanly managed in one place, no callback hell, and very intuitive API. When using eth-lightwallet, the password needs to be provided during the initiation of the hd-wallet. If the user wants to generate a new wallet, we will produce the following parameters: We can ask the user to confirm the password and the seed or generate a new set on its behalf.

Alternatively, we can ask the user for their own existing seed and password. Eth-hot-wallet implementation is based on the following code to generate random but human-readable strings: After the user has accepted the password and the seed, we can use the values and generate the new wallet. Hooked Web3 provider has been deprecated, and currently the author recommends the package ethjs-provider-signer as an alternative.

At the moment of writing, there is a bug in ethjs-provider-signer that prevents the display of error messages. Those error messages are critical for this setup to function correctly. Encrypted offline storage The lightwallet keystore vault JSON object is encrypted, and it requires from us an external passwordProvider to safely keep the encryption key. The keystrore object is always encrypted. The app is responsible for safekeeping the password and provides it with any action.

When the wallet is loaded for the first time, it will check if there is a keystore in local storage and will auto load it to Redux state if so. At this point, we can read the public data of the keystore but not the keys. To display public data before the user enters the encryption password, we need an additional operation mode: loaded and locked. In this mode, the wallet will display the addresses and fetch the balances but will not be able to perform operations such as sending transactions or even generating new addresses.

However, to properly integrate it into our saga. Sending erc20 tokens using Web3. Every token deployed on Ethereum is, in fact, a program that corresponds to the eip20 specification. Since the Ethereum virtual machine EVM is Turing complete with some restrictions , every token might have a different implementation even for the same functionality. When we are sending a token on Ethereum, we are interacting with a smart contract. We will promisify the tokenContract.

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We hope that our innovations in wallet design spur new growth and interest into making Ethereum and other EVM-compatible blockchains more usable. You have to reload the extension in the browser after every build. Both types of browsers have a "reload" button that does this. Enabling the log tracer Our wallet has a special feature that lets users view the probable token transfers emitted by a transaction prior to the transaction actually being sent.

To enable this feature, you must be running geth matching your target network with the RPC endpoint enabled on , the default port, and the debug namespace enabled. For this feature, we currently only support Chromium-like browsers. For now, the log tracer only traces a static transaction, a Uniswap swap.

All the requests are cleanly managed in one place, no callback hell, and very intuitive API. When using eth-lightwallet, the password needs to be provided during the initiation of the hd-wallet. If the user wants to generate a new wallet, we will produce the following parameters: We can ask the user to confirm the password and the seed or generate a new set on its behalf. Alternatively, we can ask the user for their own existing seed and password.

Eth-hot-wallet implementation is based on the following code to generate random but human-readable strings: After the user has accepted the password and the seed, we can use the values and generate the new wallet. Hooked Web3 provider has been deprecated, and currently the author recommends the package ethjs-provider-signer as an alternative.

At the moment of writing, there is a bug in ethjs-provider-signer that prevents the display of error messages. Those error messages are critical for this setup to function correctly. Encrypted offline storage The lightwallet keystore vault JSON object is encrypted, and it requires from us an external passwordProvider to safely keep the encryption key.

The keystrore object is always encrypted. The app is responsible for safekeeping the password and provides it with any action. When the wallet is loaded for the first time, it will check if there is a keystore in local storage and will auto load it to Redux state if so. At this point, we can read the public data of the keystore but not the keys.

To display public data before the user enters the encryption password, we need an additional operation mode: loaded and locked. In this mode, the wallet will display the addresses and fetch the balances but will not be able to perform operations such as sending transactions or even generating new addresses.

However, to properly integrate it into our saga. Sending erc20 tokens using Web3. Every token deployed on Ethereum is, in fact, a program that corresponds to the eip20 specification. Since the Ethereum virtual machine EVM is Turing complete with some restrictions , every token might have a different implementation even for the same functionality.

When we are sending a token on Ethereum, we are interacting with a smart contract. We will promisify the tokenContract. Subscribing to Ethereum transaction life-cycle using Web3. The example is provided by another project. It is an important feature and should be used extensively. The new version of Web3. Enter the PromiEvent: A promise combined event emitter. This API is far more informative and elegant than the one provided with 0.

We will see how we can integrate it into our web app with the help of Saga. The motivation is to update the application state Redux store once a change to the transaction state is detected. We need to initialize the new channel and fork a handler: The handler will catch all channel events and will call the appropriate Redux action creator. Once the channel and the handler are both ready and the user initiates the transaction, we need to register to the generated events: In fact, we don't need a new channel for each transaction and can use the same channel for all types of transactions.

The full source code of this example can be found here. Polling Ethereum blockchain and price data using redux-saga There are several ways to watch for blockchain changes. It is possible to use Web3. In eth-hot-wallet, the wallet is polling the blockchain periodically for balance changes and Coinmarketcap API for price changes.