CoinTools Update: Adding Cryptocompare Source + Context Shortcut

Introduction to CoinTools

CoinTools is a powerful, lightweight Chrome Extension for Cryptocurrency fans! It can be installed via Chrome Webstore:

https://chrome.google.com/webstore/detail/coin-tools/fmglcggbdcbkpkfapngjobfeakehpcgj

For Opera browsers, the workaround is to first install Chrome Extension Gadget.

And similarly for Firefox, you can install Chrome Store Foxified before you install CoinTools.

New Features of CoinTools v0.0.15.1

This commit adds the following features:

• Adding Cryptocompare API as a backup source so that it is more robust and supports less popular fiats such as NGN.
• Add Context Shortcuts for a few useful Cryptocurrency websites.

Screenshots of CoinTools v0.0.15.1

Single Fiat Command to Local Currency

cointools-general

History Graph from Cryptocompare

cointools-history-conversion-rate

Context Shortcuts

cointools-charts-context

Robust Cryptocompare

In this version, we have added the cryptocompare source, which is returned as a Javascript Promise.

// getting conversion from cryptocompare
const getPriceCC = (a, b) => {
    a = a.toUpperCase();
    b = b.toUpperCase();
    let api = "https://min-api.cryptocompare.com/data/price?fsym=" + a + "&tsyms=" + b;
    return new Promise((resolve, reject) => {
        fetch(api, {mode: 'cors'})
        .then(validateResponse)
        .then(readResponseAsJSON)
        .then(function(result) {
            if (result[b]) {
                resolve(result[b]);
            } else {
                reject("invalid pairs: " + a + ", " + b);
            }
        }).catch(function(error) {
            logit(get_text("request_failed", "Request failed") + ': ' + api + ": " + error);
            reject(error);
        });
    });    
}

For example, when coinmarketcap fails, the tool will go to cryptocompare:

// ajax calling API to return the price of USD for coin
const getPriceOfUSD = (coin) => {
    return new Promise((resolve, reject) => {
        let api = "https://api.coinmarketcap.com/v1/ticker/" + coin + '/';
        fetch(api, {mode: 'cors'})
        .then(validateResponse)
        .then(readResponseAsJSON)
        .then(function(result) {
            if (result[0].price_usd) {
                resolve(result[0].price_usd);
            } else {
                getPriceCC(coin, 'USD').then((res) => {
                    resolve(res);
                }).catch(function(error) {
                    reject(error);
                });
            }
        }).catch(function(error) {
            getPriceCC(coin, 'USD').then((res) => {
                resolve(res);
            }).catch(function(error) {
                logit(get_text("request_failed", "Request failed") + ': ' + api + ": " + error);
                reject(error);
            });            
        });
    });
}

Technology

Javascript that runs in the Chrome Browser (ES6)

Contribution

Fully Opensource: https://github.com/DoctorLai/CoinTools
Submit a PR or a issue if you found a bug.

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