Project 4 - Blockchain Udacity Course

In this project, you will build a Star Registry Service that allows users to claim ownership of their favorite star in the night sky.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

What things you need to install the software and how to install them

npm install

Installing

A step by step series of examples that tell you how to get a developmentenv running

Just run the app on the comand line like this

nodejs index.js

And will show this

Listening on port8000

Endpoints

For better test, I recomend use Postman to test this RESTful app, but you can use curl too.

GET /blocks
    Returns a JSON array of all blocks in the chain

GET /blocks/:BLOCK_HEIGHT
    Returns a block at a specific height

POST /block
    Adds a new block to the chain

POST /requestValidation
    This signature proves the users blockchain identity. Upon validation of this identity, the user should be granted access to register a single star.

POST /message-signature/validate
    After receiving the response, users will prove their blockchain identity by signing a message with their wallet. Once they sign this message, the application will validate their request and grant access to register a star.

GET /stars/address:[ADDRESS]
    Get star block(s) by wallet address

GET /stars/hash:[HASH]
    Get star block by hash

POST Block Endpoint

1.Validate Request and signature message

Using post method send your wallet Address

http://localhost:8000/requestValidation

Signature your message in your wallet, then use this to validate it.

http://localhost:8000/message-signature/validate

2 Post a new Star

Post a new block with data payload option to add data to the block body. The block body should support a string of text. The response for the endpoint should provide block object in JSON format.

Example POST response For URL: http://localhost:8000/block

{
"address":"1BkeGFPUC6Ek7xUN6cNFfsfCKMJaWgf7c2",
"star":{
	"dec":"-48º 25' 30.0",
	"ra":"15h 49m 6.0s ",
	"story":"Scorpius Constellation - found using www.google.com/sky"
	}
}

GET Block Endpoint - Getting the blocks by height, hash or address

Configure a GET request using URL path with a block height parameter. The response for the endpoint should provide block object is JSON format.

1 Get Block by Height

URL http://localhost:8000/block/[blockheight]

Example URL path: http://localhost:8000/block/0, where '0' is the block height.

Response The response for the endpoint should provide block object is JSON format.

Example GET Response For URL, http://localhost:8000/block/4

{
    "hash": "cedf417ad2725aa1dcd50d2cea8a37e9b81edd8f05c8a6c2f75c3fe529a23d41",
    "height": 4,
    "body": {
        "address": "1BkeGFPUC6Ek7xUN6cNFfsfCKMJaWgf7c2",
        "star": {
            "dec": "-48º 25' 30.0",
            "ra": "15h 49m 6.0s ",
            "story": "53636f727069757320436f6e7374656c6c6174696f6e202d20666f756e64207573696e67207777772e676f6f676c652e636f6d2f736b79"
        }
    },
    "time": "1545603451",
    "previousBlockHash": "3fa277e4c194ab0b49fbd125e04351974e70b8285af96340dbed640a1579aa97"
}

2 Get block by Address

http://localhost:8000/stars/address:1BkeGFPUC6Ek7xUN6cNFfsfCKMJaWgf7c2

Resṕonse - all the blocks for that Address

{
        "hash": "cedf417ad2725aa1dcd50d2cea8a37e9b81edd8f05c8a6c2f75c3fe529a23d41",
        "height": 4,
        "body": {
            "address": "1BkeGFPUC6Ek7xUN6cNFfsfCKMJaWgf7c2",
            "star": {
                "dec": "-48º 25' 30.0",
                "ra": "15h 49m 6.0s ",
                "story": "53636f727069757320436f6e7374656c6c6174696f6e202d20666f756e64207573696e67207777772e676f6f676c652e636f6d2f736b79",
                "storyDecoded": "Scorpius Constellation - found using www.google.com/sky"
            }
        },
        "time": "1545603451",
        "previousBlockHash": "3fa277e4c194ab0b49fbd125e04351974e70b8285af96340dbed640a1579aa97"
    }

3 Get block by Hash

http://localhost:8000/stars/hash:cedf417ad2725aa1dcd50d2cea8a37e9b81edd8f05c8a6c2f75c3fe529a23d41

Will return the block who contains that hash

{
    "hash": "cedf417ad2725aa1dcd50d2cea8a37e9b81edd8f05c8a6c2f75c3fe529a23d41",
    "height": 4,
    "body": {
        "address": "1BkeGFPUC6Ek7xUN6cNFfsfCKMJaWgf7c2",
        "star": {
            "dec": "-48º 25' 30.0",
            "ra": "15h 49m 6.0s ",
            "story": "53636f727069757320436f6e7374656c6c6174696f6e202d20666f756e64207573696e67207777772e676f6f676c652e636f6d2f736b79",
            "storyDecoded": "Scorpius Constellation - found using www.google.com/sky"
        }
    },
    "time": "1545603451",
    "previousBlockHash": "3fa277e4c194ab0b49fbd125e04351974e70b8285af96340dbed640a1579aa97"
}

Built With - Sources I research for this project:

javascript - Await
Javascript - Promises
Javascript - Javascript
BlockChain - used to see how a full blockchain_project working diference between var and let
javascript - var and let
javascript - var and let

alewerner / project_4