Add Bitstamp dynamic currency updater

exchanges/bitstamp/bitstamp.go

@@ -46,6 +46,7 @@ const (
 	bitstampAPIXrpWithdrawal      = "xrp_withdrawal"
 	bitstampAPIXrpDeposit         = "xrp_address"
 	bitstampAPIReturnType         = "string"
+	bitstampAPITradingPairsInfo   = "trading-pairs-info"
 )
 
 // Bitstamp is the overarching type across the bitstamp package
@@ -188,6 +189,14 @@ func (b *Bitstamp) GetOrderbook(currency string) (Orderbook, error) {
 	return orderbook, nil
 }
 
+// GetTradingPairs returns a list of trading pairs which Bitstamp
+// currently supports
+func (b *Bitstamp) GetTradingPairs() ([]TradingPair, error) {
+	var result []TradingPair
+	path := fmt.Sprintf("%s/v%s/%s", bitstampAPIURL, bitstampAPIVersion, bitstampAPITradingPairsInfo)
+	return result, common.SendHTTPGetRequest(path, true, b.Verbose, &result)
+}
+
 // GetTransactions returns transaction information
 // value paramater ["time"] = "minute", "hour", "day" will collate your
 // response into time intervals. Implementation of value in test code.