SimpleAsWater Tutorial - Building Online Publication using IPLD

publication.js

/*
PUBLICATION SYSTEM

Adding new Author
An author will have
-> name
-> profile

Creating A Blog
A Blog will have a:
-> author
-> content
-> tags
-> timeOfPublish

Read a Blog

What more we could do with this?
Try Listing all Blogs for an author. 
Send me solution at hi@simpleaswater.com and get SimpleAsWater T-Shirts 

*/

//Initiate ipfs and CID instance
const ipfsClient = require('ipfs-http-client');
const CID = require('cids');

//Connecting ipfs http client instance to local IPFS peer.
const ipfs = new ipfsClient({ host: 'localhost', port: '5001', protocol: 'http' });

//Create an Author
async function addNewAuthor(name) {
    //creating blog author object
    var newAuthor = await ipfs.dag.put({
        name: name,
        profile: "@SimpleAsWater | @TowardsBlockChain, an MIT CIC incubated startup | https://vaibhavsaini.com"
    });

    console.log("Added new Author " + name + ": " + newAuthor);

    return newAuthor;
}

//Creating a Blog
async function createBlog(author, content, tags) {

    //creating blog object
    var post = await ipfs.dag.put({
        author: author,
        content: content,
        tags: tags,
        timeOfPublish: Date()
    });

    //Fetching multihash buffer from cid object.
    const multihash = post.multihash;

    //passing multihash buffer to CID object to convert multihash to a readable format   
    const cids = new CID(1, 'dag-cbor', multihash);

    console.log("Published a new Post by " + author + ": " + cids.toBaseEncodedString());

    return cids.toBaseEncodedString();

}

//Read a blog
async function readBlog(postCID) {
    ipfs.dag.get(postCID, (err, result) => {
        if (err) {
            console.error('Error while reading post: ' + err)
        } else {
            console.log("Post Details\n", result);
            return result;
        }
    });
}


function startPublication() {
    addNewAuthor("vasa").then((newAuthor) => {
        createBlog(newAuthor, "my first post", ["ipfs", "ipld", "vasa", "towardsblockchain"]).then((postCID) => {
            readBlog(postCID);
        })
    });
}

startPublication();