@indigo-labs/dexter/build/providers/asset-metadata/token-registry-provider.js

Customizable Typescript SDK for interacting with Cardano DEXs

import axios from 'axios';
import { BaseMetadataProvider } from './base-metadata-provider';
import { appendSlash } from '../../utils';
export class TokenRegistryProvider extends BaseMetadataProvider {
    /**
     * https://input-output-hk.github.io/offchain-metadata-tools/api/latest/
     */
    constructor(requestConfig = {}) {
        super();
        this._requestConfig = requestConfig;
        this._api = axios.create({
            timeout: requestConfig.timeout ?? 5000,
            baseURL: `${appendSlash(requestConfig.proxyUrl)}https://tokens.cardano.org/`,
            headers: {
                'Content-Type': 'application/json',
            },
        });
    }
    /**
     * https://input-output-hk.github.io/offchain-metadata-tools/api/latest/#tag/query/paths/~1metadata~1query/post
     */
    fetch(assets) {
        return this._api.post('/metadata/query', {
            subjects: assets.map((asset) => asset.identifier()),
        }).then((response) => response.data.subjects.map((entry) => {
            return {
                policyId: entry.subject.slice(0, 56),
                nameHex: entry.subject.slice(56),
                decimals: entry.decimals ? Number(entry.decimals.value) : 0,
            };
        }));
    }
}