zcashrpc/zcash_client.go

package zcash2cwtch

import (
	"bytes"
	"encoding/base64"
	"encoding/json"
	"git.openprivacy.ca/openprivacy/libricochet-go/connectivity"
	"git.openprivacy.ca/openprivacy/libricochet-go/log"
	"io/ioutil"
	"net"
	"net/http"
)

type ZcashResult struct {
	Result interface{} `json:"result"`
}

type ZcashClient interface {
	ListReceivedTransactionsByAddress(string) ([]ZcashTransaction, error)
	GetTransaction(string) (Transaction, error)
}

type zcashOnionClient struct {
	client http.Client
	onion  string
	auth   string
}

// NewClient creates a new Zcash rpc client over an onion address
func NewClient(onion string, username, password string, acn connectivity.ACN) ZcashClient {
	zc := new(zcashOnionClient)
	zc.onion = onion
	zc.client = http.Client{
		Transport: &http.Transport{
			Dial: func(network, addr string) (net.Conn, error) {
				conn, _, err := acn.Open(onion)
				return conn, err
			},
		},
	}
	zc.auth = base64.StdEncoding.EncodeToString([]byte(username + ":" + password))
	return zc
}

func (zc *zcashOnionClient) GetTransaction(id string) (Transaction, error) {
	var jsonStr = []byte(`{"jsonrpc": "1.0", "id":"zcash2cwtch", "method": "gettransaction", "params": ["` + id + `"]}`)
	req, err := http.NewRequest("POST", "http://"+zc.onion+".onion:9878", bytes.NewBuffer(jsonStr))
	if err != nil {
		return Transaction{}, err
	}
	req.Header.Add("Authorization", "Basic "+zc.auth)
	log.Debugf("Sending request to zcash server %v", req)
	resp, err := zc.client.Do(req)
	if err != nil {
		return Transaction{}, err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return Transaction{}, err
	}
	log.Debugf("Got response from zcash server %s", body)
	var transaction Transaction
	result := &ZcashResult{Result: &transaction}
	err = json.Unmarshal(body, &result)
	return transaction, err
}

func (zc *zcashOnionClient) ListReceivedTransactionsByAddress(address string) ([]ZcashTransaction, error) {
	var jsonStr = []byte(`{"jsonrpc": "1.0", "id":"zcash2cwtch", "method": "z_listreceivedbyaddress", "params": ["` + address + `"]}`)
	req, err := http.NewRequest("POST", "http://"+zc.onion+".onion:9878", bytes.NewBuffer(jsonStr))
	if err != nil {
		return nil, err
	}
	req.Header.Add("Authorization", "Basic "+zc.auth)
	log.Debugf("Sending request to zcash server %v", req)
	resp, err := zc.client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	log.Debugf("Got response from zcash server %s", body)
	transactions := []ZcashTransaction{}
	result := &ZcashResult{Result: &transactions}
	err = json.Unmarshal(body, &result)
	return transactions, err
}