How to store picture s in a hyperledger blockchain channel

Question

In my Hyperledger fabric project, I have a scenario where one of the asset is of type (images). How do I handle this asset in chaincode and are there any samples i can refer to (preferebly node.js).

Answer 1

You can hold images as encrypted characters such like base64 in Fabric Network.
That was once mentioned in IBM DeveloperWorks Blog, but I can't find the article.

If you use Hyperledger Composer, I think assigning an image to a property of the asset is useful.

In my case, tx is submitted from node.js server like below.

'use strict'

const util = require('util');
var fs = require('fs');
const readFile = util.promisify(fs.readFile);

const BusinessNetworkConnection = require('composer-client').BusinessNetworkConnection;
this.bizNetworkConnection = new BusinessNetworkConnection();
this.cardName = '<REPLACE_CARD_NAME>';

async function createAsset(imgPath) {
    try {
        // Connect to Fabric Network.
        let definition = await this.bizNetworkConnection.connect(this.cardName)
        let factory = definition.getFactory();

        // Create a new asset which have property for base64 image.
        let newAsset = factory.newResource('com.namespace.your', 'AssetName', 'assetId');
        newAsset.imageBase64 = await readFile(imgPath,'base64');

        // Add the Asset to AssetRegistry.
        let assetRegistry = await this.bizNetworkConnection.getAssetRegistry('com.namespace.your.AssetName');
        await assetRegistry.add(newAsset);
    } catch (err) {
        console.error(err);
    } finally {
        this.bizNetworkConnection.disconnect();
    }
}