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still pending, an accepted HTTP status (202) is returned signalling proper verification of the login request is still pending. If the JWT passed to /finishLogin is invalid, an unauthorized HTTP status code is returned (401). After the /finishLogin endpoint is called and the login process is completed, the returned JWT can be used to access other parts of the API. In this case, the /apiTest endpoint is available. It simply returns “It works!” wrapped in a JSON object if the user is logged-in. Grab the full example.21 2.3.1 Running the Example Building and deploying the example is not as straightforward as it may seem due to the nature of Ethereum and current development tools. Here are the steps we used to test the example above. 2.3.1.1 1. Get an Ethereum node client There are several Ethereum node clients. A popular one is go-ethereum22, a client written in Go. Download and install it. Ethereum, as other cryptocurrencies do, has different versions of the blockchain with different parameters. There are essentially two blockchains: the main official blockchain and a test blockchain. The main blockchain never undoes operations once they are confirmed. Since some operations require money, the main blockchain is not ideal for testing. The test blockchain, on the other hand, is much less strict about forks and changes. It is also simpler to mine “Ether”, Ethereum’s currency. We could use the test network for our example here. However, running a client node for any of the public networks is problematic for one reason: to be able to start doing transactions, the client must first verify all previous transactions in the blockchain. That means that bootstrapping a new client node takes quite a bit of time. Fortunately there is an alternative: we can create a new, pristine private Ethereum blockchain to run our tests. To do so, run go-ethereum using the following command line: ./geth --rpc --nat none --dev 2.3.1.2 2. Create a new Ethereum account to mine some Ether The geth command can also be used to interact with a running client. Launch an interactive console connected to the running client: /geth attach ipc:/var/folders/ts/7xznj_p13xb7_5th3w6yjmjm0000gn/T/ethereum_dev_mode/geth.ipc The IPC file mentioned in the command can be found in the output from running the node in our first step. Look for the line that reads: IPC endpoint opened: /var/folders/ts/7xznj_p13xb7_5th3w6yjmjm0000gn/T/ethereum_dev_mode/geth.ipc 21 https://github.com/auth0- blog/ethereum- login- sample 22 https://github.com/ethereum/go- ethereum 44PDF Image | Intro to Ethereum and Smart Contracts
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