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getProviderName = () => {
    let providerName = "UNKNOWN"

    if(window.web3.currentProvider.constructor.name === "MetamaskInpageProvider")        
        providerName = "METAMASK"

    else if(window.web3.currentProvider.constructor.name === "EthereumProvider")        
        providerName = "MIST"

    else if(window.web3.currentProvider.constructor.name === "o")        
        providerName = "PARITY"

    else if(window.web3.currentProvider.host.indexOf("infura")!==-1) 
        providerName = "INFURA"      

    else if(window.web3.currentProvider.host.indexOf("localhost")!==-1)  
        providerName ="LOCALHOST"

    return providerName
}

// via https://ethereum.stackexchange.com/questions/24266/elegant-way-to-detect-current-provider-int-web3-js