Tutorial Send Document to IPFS

Tutorials - Send Document to IPFS

This guide aims to provide an example of how to register documents in the ipfs node.

Requirements

Node IPFS
Nodejs > 10.x
ipfs-http-client

Install dependencies

Please clone this repository and move to the sample folder.

				
					
$ https://github.com/LACNetNetworks/ipfs.git
$ cd sample

Then install the dependencies

				
					
$ npm install

The following code allows you to register an academy credential in ipfs and then register the ipfs hash in the blockhain.

				
					
const express = require('express');
const ipfsClient = require('ipfs-http-client');

const ipfs = ipfsClient('http://localhost:5001');
const app = express();

app.use(express.json());

app.post('/addCredential', async (req, res) => {
    const data = req.body;
    
    const fileHash = await addFile(data);
    return res.send(`http://localhost:8080/ipfs/${ fileHash }`);
});

const addFile = async (file) => {
    const filesAdded = await ipfs.add(JSON.stringify(file));
    return filesAdded[0].hash;
}
app.listen(3000, () => {
    console.log('Server running on port 3000');
});

We start the server on port 3000.

				
					
$ node index.js

We register our credential in IPFS

				
					
$ curl --location --request POST 'localhost:3000/addCredential' \
--header 'Content-Type: application/json' \
--data-raw '{
	"@context": [
		"https://www.w3.org/2018/credentials/v1",
		"https://www.lacchain.net/credentials/library/education/4e6c312cd8e6b18116fe3fd2e9b6e5df810afe0a716c1c511ef6c19cb8554578/v1"
	],
	"id": "d49ec380-49eb-474f-8128-a572e8b29278",
	"type": [
		"VerifiableCredential",
		"Certificate"
	],
	"issuer": "did:ethr:lacchain:0xadf1702b76419f428014d1386af487b2d8145f83",
	"issuanceDate": "2020-10-21T15:49:00.057Z",
	"expirationDate": "2025-10-21T15:49:00.057Z",
	"credentialSubject": {
		"id": "did:ethr:lacchain:0x48007072061dc756e5a2ecf15cf2c2bcc091de52",
		"givenName": "George",
		"familyName": "Walch",
		"email": "gw@town.org",
		"holds": {
			"category": "Diploma",
			"industry": "Computer Science",
			"skillset": "Blockchain",
			"course": "Introducción a LACChain Besu",
			"description": "Curso introductorio de despliegue de nodos en LACChain Besu para desarrolladores",
			"url": "https://aula.blockchainacademy.cl/p/introduccion-a-lacchain",
			"duration": 40,
			"modality": "virtual",
			"location": null
		}
	},
	"evidence": true,
	"credentialStatus": {
		"id": "0x4185Dab0662ccDa3D3F35779578a4242bb89Db37",
		"type": "SmartContract"
	},
	"proof": [
		{
			"id": "did:ethr:lacchain:0xadf1702b76419f428014d1386af487b2d8145f83",
			"type": "EcdsaSecp256k1Signature2019",
			"proofPurpose": "assertionMethod",
			"verificationMethod": "0x7a746D34754C14EB3eb1F214BD0EA23a1A18Be7A",
			"proofValue": "0x0b8d75810bf30fd221ddd6892e9e50b1c63240aba4767a9af2bfb8d8e5944e7b169f78d99f3174055de5a7fcbb65d1367c900a19302c5409a01d77339001d7181b"
		},
		{
			"id": "did:ethr:lacchain:0xf0c0ee53386b8463ff3e58203d45d982058b7917",
			"type": "EcdsaSecp256k1Signature2019",
			"proofPurpose": "assertionMethod",
			"verificationMethod": "0x7a746D34754C14EB3eb1F214BD0EA23a1A18Be7A",
			"proofValue": "0xb1d3eb341fef023b28a9e62bb6ba66ca5b473872249bd6724afcbc71a0d08a8e5a1fd2a325d5591e1380e94404921b90d6589b9366e9c2c638b2683e7c230fcd1b"
		},
		{
			"id": "did:ethr:lacchain:0xaa799564d54356cc754bd5d126101602f1d01ced",
			"type": "EcdsaSecp256k1Signature2019",
			"proofPurpose": "assertionMethod",
			"verificationMethod": "0x7a746D34754C14EB3eb1F214BD0EA23a1A18Be7A",
			"proofValue": "0x4361ba3b2e1a392858e5a6da1a4a948f1f73107849951e4167d9ad89cc0a35bf593d774e9e3ea9cf3ce2b7133c9c8ae1c6d3c2730ff0ec5c20a602cc1b61f21c1b"
		}
	]
}'

We have as a result the hash ipfs QmVPwyet87XRotrdyj1jrhaoXfiav9dupZsTkWmPuBjhZj which you can check at gateway IPFS http://localhost:8080/ipfs/QmVPwyet87XRotrdyj1jrhaoXfiav9dupZsTkWmPuBjhZj

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