2017-04-10 16:25:53 -07:00
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// Copyright 2017 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// faucet is a Ether faucet backed by a light client.
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package main
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//go:generate go-bindata -nometadata -o website.go faucet.html
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2018-01-08 04:15:57 -08:00
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//go:generate gofmt -w -s website.go
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2017-04-10 16:25:53 -07:00
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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2017-04-10 16:25:53 -07:00
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"flag"
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"fmt"
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"html/template"
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"io/ioutil"
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"math"
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"math/big"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/accounts/keystore"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/ethclient"
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"github.com/ethereum/go-ethereum/ethstats"
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"github.com/ethereum/go-ethereum/les"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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"github.com/ethereum/go-ethereum/p2p/nat"
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"github.com/ethereum/go-ethereum/params"
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"golang.org/x/net/websocket"
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)
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var (
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genesisFlag = flag.String("genesis", "", "Genesis json file to seed the chain with")
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apiPortFlag = flag.Int("apiport", 8080, "Listener port for the HTTP API connection")
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ethPortFlag = flag.Int("ethport", 30303, "Listener port for the devp2p connection")
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bootFlag = flag.String("bootnodes", "", "Comma separated bootnode enode URLs to seed with")
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netFlag = flag.Uint64("network", 0, "Network ID to use for the Ethereum protocol")
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statsFlag = flag.String("ethstats", "", "Ethstats network monitoring auth string")
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netnameFlag = flag.String("faucet.name", "", "Network name to assign to the faucet")
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payoutFlag = flag.Int("faucet.amount", 1, "Number of Ethers to pay out per user request")
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minutesFlag = flag.Int("faucet.minutes", 1440, "Number of minutes to wait between funding rounds")
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tiersFlag = flag.Int("faucet.tiers", 3, "Number of funding tiers to enable (x3 time, x2.5 funds)")
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accJSONFlag = flag.String("account.json", "", "Key json file to fund user requests with")
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accPassFlag = flag.String("account.pass", "", "Decryption password to access faucet funds")
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captchaToken = flag.String("captcha.token", "", "Recaptcha site key to authenticate client side")
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captchaSecret = flag.String("captcha.secret", "", "Recaptcha secret key to authenticate server side")
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2017-10-23 00:22:23 -07:00
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noauthFlag = flag.Bool("noauth", false, "Enables funding requests without authentication")
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logFlag = flag.Int("loglevel", 3, "Log level to use for Ethereum and the faucet")
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)
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var (
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ether = new(big.Int).Exp(big.NewInt(10), big.NewInt(18), nil)
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)
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func main() {
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// Parse the flags and set up the logger to print everything requested
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flag.Parse()
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log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(*logFlag), log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
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// Construct the payout tiers
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amounts := make([]string, *tiersFlag)
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periods := make([]string, *tiersFlag)
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for i := 0; i < *tiersFlag; i++ {
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// Calculate the amount for the next tier and format it
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amount := float64(*payoutFlag) * math.Pow(2.5, float64(i))
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amounts[i] = fmt.Sprintf("%s Ethers", strconv.FormatFloat(amount, 'f', -1, 64))
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if amount == 1 {
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amounts[i] = strings.TrimSuffix(amounts[i], "s")
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}
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// Calculate the period for the next tier and format it
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period := *minutesFlag * int(math.Pow(3, float64(i)))
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periods[i] = fmt.Sprintf("%d mins", period)
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if period%60 == 0 {
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period /= 60
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periods[i] = fmt.Sprintf("%d hours", period)
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if period%24 == 0 {
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period /= 24
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periods[i] = fmt.Sprintf("%d days", period)
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}
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}
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if period == 1 {
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periods[i] = strings.TrimSuffix(periods[i], "s")
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}
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}
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// Load up and render the faucet website
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tmpl, err := Asset("faucet.html")
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if err != nil {
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log.Crit("Failed to load the faucet template", "err", err)
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}
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website := new(bytes.Buffer)
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err = template.Must(template.New("").Parse(string(tmpl))).Execute(website, map[string]interface{}{
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"Network": *netnameFlag,
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"Amounts": amounts,
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"Periods": periods,
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"Recaptcha": *captchaToken,
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"NoAuth": *noauthFlag,
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})
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if err != nil {
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log.Crit("Failed to render the faucet template", "err", err)
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}
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// Load and parse the genesis block requested by the user
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blob, err := ioutil.ReadFile(*genesisFlag)
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if err != nil {
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log.Crit("Failed to read genesis block contents", "genesis", *genesisFlag, "err", err)
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}
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genesis := new(core.Genesis)
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if err = json.Unmarshal(blob, genesis); err != nil {
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log.Crit("Failed to parse genesis block json", "err", err)
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}
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// Convert the bootnodes to internal enode representations
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var enodes []*discv5.Node
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for _, boot := range strings.Split(*bootFlag, ",") {
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if url, err := discv5.ParseNode(boot); err == nil {
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enodes = append(enodes, url)
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} else {
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log.Error("Failed to parse bootnode URL", "url", boot, "err", err)
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}
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}
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// Load up the account key and decrypt its password
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if blob, err = ioutil.ReadFile(*accPassFlag); err != nil {
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log.Crit("Failed to read account password contents", "file", *accPassFlag, "err", err)
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}
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// Delete trailing newline in password
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pass := strings.TrimSuffix(string(blob), "\n")
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ks := keystore.NewKeyStore(filepath.Join(os.Getenv("HOME"), ".faucet", "keys"), keystore.StandardScryptN, keystore.StandardScryptP)
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if blob, err = ioutil.ReadFile(*accJSONFlag); err != nil {
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log.Crit("Failed to read account key contents", "file", *accJSONFlag, "err", err)
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}
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acc, err := ks.Import(blob, pass, pass)
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if err != nil {
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log.Crit("Failed to import faucet signer account", "err", err)
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}
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ks.Unlock(acc, pass)
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// Assemble and start the faucet light service
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faucet, err := newFaucet(genesis, *ethPortFlag, enodes, *netFlag, *statsFlag, ks, website.Bytes())
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if err != nil {
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log.Crit("Failed to start faucet", "err", err)
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}
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defer faucet.close()
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if err := faucet.listenAndServe(*apiPortFlag); err != nil {
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log.Crit("Failed to launch faucet API", "err", err)
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}
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}
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// request represents an accepted funding request.
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type request struct {
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Avatar string `json:"avatar"` // Avatar URL to make the UI nicer
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Account common.Address `json:"account"` // Ethereum address being funded
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Time time.Time `json:"time"` // Timestamp when the request was accepted
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Tx *types.Transaction `json:"tx"` // Transaction funding the account
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}
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// faucet represents a crypto faucet backed by an Ethereum light client.
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type faucet struct {
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config *params.ChainConfig // Chain configurations for signing
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stack *node.Node // Ethereum protocol stack
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client *ethclient.Client // Client connection to the Ethereum chain
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index []byte // Index page to serve up on the web
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keystore *keystore.KeyStore // Keystore containing the single signer
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account accounts.Account // Account funding user faucet requests
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head *types.Header // Current head header of the faucet
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balance *big.Int // Current balance of the faucet
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nonce uint64 // Current pending nonce of the faucet
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price *big.Int // Current gas price to issue funds with
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conns []*websocket.Conn // Currently live websocket connections
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timeouts map[string]time.Time // History of users and their funding timeouts
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reqs []*request // Currently pending funding requests
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update chan struct{} // Channel to signal request updates
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lock sync.RWMutex // Lock protecting the faucet's internals
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}
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2017-04-25 04:31:15 -07:00
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func newFaucet(genesis *core.Genesis, port int, enodes []*discv5.Node, network uint64, stats string, ks *keystore.KeyStore, index []byte) (*faucet, error) {
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// Assemble the raw devp2p protocol stack
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stack, err := node.New(&node.Config{
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Name: "geth",
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Version: params.VersionWithMeta,
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DataDir: filepath.Join(os.Getenv("HOME"), ".faucet"),
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P2P: p2p.Config{
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NAT: nat.Any(),
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NoDiscovery: true,
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DiscoveryV5: true,
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ListenAddr: fmt.Sprintf(":%d", port),
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MaxPeers: 25,
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BootstrapNodesV5: enodes,
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},
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})
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if err != nil {
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return nil, err
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}
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// Assemble the Ethereum light client protocol
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if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
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cfg := eth.DefaultConfig
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cfg.SyncMode = downloader.LightSync
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cfg.NetworkId = network
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cfg.Genesis = genesis
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return les.New(ctx, &cfg)
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}); err != nil {
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return nil, err
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}
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// Assemble the ethstats monitoring and reporting service'
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if stats != "" {
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if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
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var serv *les.LightEthereum
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ctx.Service(&serv)
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return ethstats.New(stats, nil, serv)
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}); err != nil {
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return nil, err
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}
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}
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// Boot up the client and ensure it connects to bootnodes
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if err := stack.Start(); err != nil {
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return nil, err
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}
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for _, boot := range enodes {
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old, _ := discover.ParseNode(boot.String())
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stack.Server().AddPeer(old)
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}
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// Attach to the client and retrieve and interesting metadatas
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api, err := stack.Attach()
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if err != nil {
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stack.Stop()
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return nil, err
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}
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client := ethclient.NewClient(api)
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return &faucet{
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config: genesis.Config,
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stack: stack,
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client: client,
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index: index,
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keystore: ks,
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account: ks.Accounts()[0],
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timeouts: make(map[string]time.Time),
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update: make(chan struct{}, 1),
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}, nil
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}
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// close terminates the Ethereum connection and tears down the faucet.
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func (f *faucet) close() error {
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return f.stack.Stop()
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}
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// listenAndServe registers the HTTP handlers for the faucet and boots it up
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// for service user funding requests.
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func (f *faucet) listenAndServe(port int) error {
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go f.loop()
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http.HandleFunc("/", f.webHandler)
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http.Handle("/api", websocket.Handler(f.apiHandler))
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return http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
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}
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// webHandler handles all non-api requests, simply flattening and returning the
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// faucet website.
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func (f *faucet) webHandler(w http.ResponseWriter, r *http.Request) {
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w.Write(f.index)
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}
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// apiHandler handles requests for Ether grants and transaction statuses.
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func (f *faucet) apiHandler(conn *websocket.Conn) {
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|
|
// Start tracking the connection and drop at the end
|
2017-10-17 02:08:57 -07:00
|
|
|
defer conn.Close()
|
|
|
|
|
2017-04-10 16:25:53 -07:00
|
|
|
f.lock.Lock()
|
|
|
|
f.conns = append(f.conns, conn)
|
|
|
|
f.lock.Unlock()
|
|
|
|
|
|
|
|
defer func() {
|
|
|
|
f.lock.Lock()
|
|
|
|
for i, c := range f.conns {
|
|
|
|
if c == conn {
|
|
|
|
f.conns = append(f.conns[:i], f.conns[i+1:]...)
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
f.lock.Unlock()
|
|
|
|
}()
|
2017-10-17 02:08:57 -07:00
|
|
|
// Gather the initial stats from the network to report
|
|
|
|
var (
|
|
|
|
head *types.Header
|
|
|
|
balance *big.Int
|
|
|
|
nonce uint64
|
|
|
|
err error
|
|
|
|
)
|
2018-09-21 03:15:09 -07:00
|
|
|
for head == nil || balance == nil {
|
|
|
|
// Retrieve the current stats cached by the faucet
|
|
|
|
f.lock.RLock()
|
|
|
|
if f.head != nil {
|
|
|
|
head = types.CopyHeader(f.head)
|
2017-10-17 02:08:57 -07:00
|
|
|
}
|
2018-09-21 03:15:09 -07:00
|
|
|
if f.balance != nil {
|
|
|
|
balance = new(big.Int).Set(f.balance)
|
|
|
|
}
|
|
|
|
nonce = f.nonce
|
|
|
|
f.lock.RUnlock()
|
2017-04-10 16:25:53 -07:00
|
|
|
|
2018-09-21 03:15:09 -07:00
|
|
|
if head == nil || balance == nil {
|
|
|
|
// Report the faucet offline until initial stats are ready
|
|
|
|
if err = sendError(conn, errors.New("Faucet offline")); err != nil {
|
2017-10-17 02:08:57 -07:00
|
|
|
log.Warn("Failed to send faucet error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
time.Sleep(3 * time.Second)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Send over the initial stats and the latest header
|
|
|
|
if err = send(conn, map[string]interface{}{
|
2018-09-21 03:15:09 -07:00
|
|
|
"funds": new(big.Int).Div(balance, ether),
|
2017-04-10 16:25:53 -07:00
|
|
|
"funded": nonce,
|
|
|
|
"peers": f.stack.Server().PeerCount(),
|
|
|
|
"requests": f.reqs,
|
2017-10-17 02:08:57 -07:00
|
|
|
}, 3*time.Second); err != nil {
|
|
|
|
log.Warn("Failed to send initial stats to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if err = send(conn, head, 3*time.Second); err != nil {
|
|
|
|
log.Warn("Failed to send initial header to client", "err", err)
|
|
|
|
return
|
2017-05-02 03:52:51 -07:00
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
// Keep reading requests from the websocket until the connection breaks
|
|
|
|
for {
|
|
|
|
// Fetch the next funding request and validate against github
|
|
|
|
var msg struct {
|
2017-04-16 09:49:40 -07:00
|
|
|
URL string `json:"url"`
|
2017-05-02 03:52:51 -07:00
|
|
|
Tier uint `json:"tier"`
|
2017-04-16 09:49:40 -07:00
|
|
|
Captcha string `json:"captcha"`
|
2017-04-10 16:25:53 -07:00
|
|
|
}
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = websocket.JSON.Receive(conn, &msg); err != nil {
|
2017-04-10 16:25:53 -07:00
|
|
|
return
|
|
|
|
}
|
2017-10-23 00:22:23 -07:00
|
|
|
if !*noauthFlag && !strings.HasPrefix(msg.URL, "https://gist.github.com/") && !strings.HasPrefix(msg.URL, "https://twitter.com/") &&
|
2017-10-16 06:30:13 -07:00
|
|
|
!strings.HasPrefix(msg.URL, "https://plus.google.com/") && !strings.HasPrefix(msg.URL, "https://www.facebook.com/") {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, errors.New("URL doesn't link to supported services")); err != nil {
|
|
|
|
log.Warn("Failed to send URL error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
continue
|
|
|
|
}
|
2017-05-02 03:52:51 -07:00
|
|
|
if msg.Tier >= uint(*tiersFlag) {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, errors.New("Invalid funding tier requested")); err != nil {
|
|
|
|
log.Warn("Failed to send tier error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-05-02 03:52:51 -07:00
|
|
|
continue
|
|
|
|
}
|
2017-10-16 06:30:13 -07:00
|
|
|
log.Info("Faucet funds requested", "url", msg.URL, "tier", msg.Tier)
|
2017-04-16 09:49:40 -07:00
|
|
|
|
|
|
|
// If captcha verifications are enabled, make sure we're not dealing with a robot
|
|
|
|
if *captchaToken != "" {
|
|
|
|
form := url.Values{}
|
|
|
|
form.Add("secret", *captchaSecret)
|
|
|
|
form.Add("response", msg.Captcha)
|
|
|
|
|
|
|
|
res, err := http.PostForm("https://www.google.com/recaptcha/api/siteverify", form)
|
|
|
|
if err != nil {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, err); err != nil {
|
|
|
|
log.Warn("Failed to send captcha post error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-16 09:49:40 -07:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
var result struct {
|
|
|
|
Success bool `json:"success"`
|
|
|
|
Errors json.RawMessage `json:"error-codes"`
|
|
|
|
}
|
|
|
|
err = json.NewDecoder(res.Body).Decode(&result)
|
|
|
|
res.Body.Close()
|
|
|
|
if err != nil {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, err); err != nil {
|
|
|
|
log.Warn("Failed to send captcha decode error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-16 09:49:40 -07:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
if !result.Success {
|
|
|
|
log.Warn("Captcha verification failed", "err", string(result.Errors))
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, errors.New("Beep-bop, you're a robot!")); err != nil {
|
|
|
|
log.Warn("Failed to send captcha failure to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-16 09:49:40 -07:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
}
|
2017-10-16 06:30:13 -07:00
|
|
|
// Retrieve the Ethereum address to fund, the requesting user and a profile picture
|
|
|
|
var (
|
|
|
|
username string
|
|
|
|
avatar string
|
|
|
|
address common.Address
|
|
|
|
)
|
|
|
|
switch {
|
|
|
|
case strings.HasPrefix(msg.URL, "https://gist.github.com/"):
|
2017-10-29 09:02:33 -07:00
|
|
|
if err = sendError(conn, errors.New("GitHub authentication discontinued at the official request of GitHub")); err != nil {
|
|
|
|
log.Warn("Failed to send GitHub deprecation to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
continue
|
2017-10-16 06:30:13 -07:00
|
|
|
case strings.HasPrefix(msg.URL, "https://twitter.com/"):
|
|
|
|
username, avatar, address, err = authTwitter(msg.URL)
|
|
|
|
case strings.HasPrefix(msg.URL, "https://plus.google.com/"):
|
|
|
|
username, avatar, address, err = authGooglePlus(msg.URL)
|
|
|
|
case strings.HasPrefix(msg.URL, "https://www.facebook.com/"):
|
|
|
|
username, avatar, address, err = authFacebook(msg.URL)
|
2017-10-23 00:22:23 -07:00
|
|
|
case *noauthFlag:
|
|
|
|
username, avatar, address, err = authNoAuth(msg.URL)
|
2017-10-16 06:30:13 -07:00
|
|
|
default:
|
|
|
|
err = errors.New("Something funky happened, please open an issue at https://github.com/ethereum/go-ethereum/issues")
|
2017-04-10 16:25:53 -07:00
|
|
|
}
|
|
|
|
if err != nil {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, err); err != nil {
|
|
|
|
log.Warn("Failed to send prefix error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
continue
|
|
|
|
}
|
2017-10-16 06:30:13 -07:00
|
|
|
log.Info("Faucet request valid", "url", msg.URL, "tier", msg.Tier, "user", username, "address", address)
|
2017-04-16 08:49:06 -07:00
|
|
|
|
2017-04-10 16:25:53 -07:00
|
|
|
// Ensure the user didn't request funds too recently
|
|
|
|
f.lock.Lock()
|
|
|
|
var (
|
|
|
|
fund bool
|
2017-05-02 03:52:51 -07:00
|
|
|
timeout time.Time
|
2017-04-10 16:25:53 -07:00
|
|
|
)
|
2017-10-16 06:30:13 -07:00
|
|
|
if timeout = f.timeouts[username]; time.Now().After(timeout) {
|
2017-04-10 16:25:53 -07:00
|
|
|
// User wasn't funded recently, create the funding transaction
|
2017-05-02 03:52:51 -07:00
|
|
|
amount := new(big.Int).Mul(big.NewInt(int64(*payoutFlag)), ether)
|
|
|
|
amount = new(big.Int).Mul(amount, new(big.Int).Exp(big.NewInt(5), big.NewInt(int64(msg.Tier)), nil))
|
|
|
|
amount = new(big.Int).Div(amount, new(big.Int).Exp(big.NewInt(2), big.NewInt(int64(msg.Tier)), nil))
|
|
|
|
|
2017-11-13 03:47:27 -08:00
|
|
|
tx := types.NewTransaction(f.nonce+uint64(len(f.reqs)), address, amount, 21000, f.price, nil)
|
2018-06-05 03:31:34 -07:00
|
|
|
signed, err := f.keystore.SignTx(f.account, tx, f.config.ChainID)
|
2017-04-10 16:25:53 -07:00
|
|
|
if err != nil {
|
|
|
|
f.lock.Unlock()
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, err); err != nil {
|
|
|
|
log.Warn("Failed to send transaction creation error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
// Submit the transaction and mark as funded if successful
|
|
|
|
if err := f.client.SendTransaction(context.Background(), signed); err != nil {
|
|
|
|
f.lock.Unlock()
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendError(conn, err); err != nil {
|
|
|
|
log.Warn("Failed to send transaction transmission error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
continue
|
|
|
|
}
|
|
|
|
f.reqs = append(f.reqs, &request{
|
2017-10-16 06:30:13 -07:00
|
|
|
Avatar: avatar,
|
|
|
|
Account: address,
|
|
|
|
Time: time.Now(),
|
|
|
|
Tx: signed,
|
2017-04-10 16:25:53 -07:00
|
|
|
})
|
2017-10-16 06:30:13 -07:00
|
|
|
f.timeouts[username] = time.Now().Add(time.Duration(*minutesFlag*int(math.Pow(3, float64(msg.Tier)))) * time.Minute)
|
2017-04-10 16:25:53 -07:00
|
|
|
fund = true
|
|
|
|
}
|
|
|
|
f.lock.Unlock()
|
|
|
|
|
|
|
|
// Send an error if too frequent funding, othewise a success
|
|
|
|
if !fund {
|
2017-12-12 10:05:47 -08:00
|
|
|
if err = sendError(conn, fmt.Errorf("%s left until next allowance", common.PrettyDuration(timeout.Sub(time.Now())))); err != nil { // nolint: gosimple
|
2017-10-17 02:08:57 -07:00
|
|
|
log.Warn("Failed to send funding error to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
continue
|
|
|
|
}
|
2017-10-17 02:08:57 -07:00
|
|
|
if err = sendSuccess(conn, fmt.Sprintf("Funding request accepted for %s into %s", username, address.Hex())); err != nil {
|
|
|
|
log.Warn("Failed to send funding success to client", "err", err)
|
|
|
|
return
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
select {
|
|
|
|
case f.update <- struct{}{}:
|
|
|
|
default:
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-09-21 03:15:09 -07:00
|
|
|
// refresh attempts to retrieve the latest header from the chain and extract the
|
|
|
|
// associated faucet balance and nonce for connectivity caching.
|
|
|
|
func (f *faucet) refresh(head *types.Header) error {
|
|
|
|
// Ensure a state update does not run for too long
|
|
|
|
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
|
|
defer cancel()
|
|
|
|
|
|
|
|
// If no header was specified, use the current chain head
|
|
|
|
var err error
|
|
|
|
if head == nil {
|
|
|
|
if head, err = f.client.HeaderByNumber(ctx, nil); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Retrieve the balance, nonce and gas price from the current head
|
|
|
|
var (
|
|
|
|
balance *big.Int
|
|
|
|
nonce uint64
|
|
|
|
price *big.Int
|
|
|
|
)
|
|
|
|
if balance, err = f.client.BalanceAt(ctx, f.account.Address, head.Number); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
if nonce, err = f.client.NonceAt(ctx, f.account.Address, head.Number); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
if price, err = f.client.SuggestGasPrice(ctx); err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
// Everything succeeded, update the cached stats and eject old requests
|
|
|
|
f.lock.Lock()
|
|
|
|
f.head, f.balance = head, balance
|
|
|
|
f.price, f.nonce = price, nonce
|
|
|
|
for len(f.reqs) > 0 && f.reqs[0].Tx.Nonce() < f.nonce {
|
|
|
|
f.reqs = f.reqs[1:]
|
|
|
|
}
|
|
|
|
f.lock.Unlock()
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2017-04-10 16:25:53 -07:00
|
|
|
// loop keeps waiting for interesting events and pushes them out to connected
|
|
|
|
// websockets.
|
|
|
|
func (f *faucet) loop() {
|
|
|
|
// Wait for chain events and push them to clients
|
|
|
|
heads := make(chan *types.Header, 16)
|
|
|
|
sub, err := f.client.SubscribeNewHead(context.Background(), heads)
|
|
|
|
if err != nil {
|
|
|
|
log.Crit("Failed to subscribe to head events", "err", err)
|
|
|
|
}
|
|
|
|
defer sub.Unsubscribe()
|
|
|
|
|
2018-03-02 01:57:11 -08:00
|
|
|
// Start a goroutine to update the state from head notifications in the background
|
|
|
|
update := make(chan *types.Header)
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
for head := range update {
|
2017-04-10 16:25:53 -07:00
|
|
|
// New chain head arrived, query the current stats and stream to clients
|
2018-09-21 03:15:09 -07:00
|
|
|
timestamp := time.Unix(head.Time.Int64(), 0)
|
|
|
|
if time.Since(timestamp) > time.Hour {
|
|
|
|
log.Warn("Skipping faucet refresh, head too old", "number", head.Number, "hash", head.Hash(), "age", common.PrettyAge(timestamp))
|
|
|
|
continue
|
2017-10-17 02:08:57 -07:00
|
|
|
}
|
2018-09-21 03:15:09 -07:00
|
|
|
if err := f.refresh(head); err != nil {
|
2017-10-17 02:08:57 -07:00
|
|
|
log.Warn("Failed to update faucet state", "block", head.Number, "hash", head.Hash(), "err", err)
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
// Faucet state retrieved, update locally and send to clients
|
2018-09-21 03:15:09 -07:00
|
|
|
f.lock.RLock()
|
|
|
|
log.Info("Updated faucet state", "number", head.Number, "hash", head.Hash(), "age", common.PrettyAge(timestamp), "balance", f.balance, "nonce", f.nonce, "price", f.price)
|
2017-04-10 16:25:53 -07:00
|
|
|
|
2018-09-21 03:15:09 -07:00
|
|
|
balance := new(big.Int).Div(f.balance, ether)
|
|
|
|
peers := f.stack.Server().PeerCount()
|
2017-04-10 16:25:53 -07:00
|
|
|
|
|
|
|
for _, conn := range f.conns {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err := send(conn, map[string]interface{}{
|
2017-04-10 16:25:53 -07:00
|
|
|
"funds": balance,
|
|
|
|
"funded": f.nonce,
|
2018-09-21 03:15:09 -07:00
|
|
|
"peers": peers,
|
2017-04-10 16:25:53 -07:00
|
|
|
"requests": f.reqs,
|
2017-10-17 02:08:57 -07:00
|
|
|
}, time.Second); err != nil {
|
2017-04-10 16:25:53 -07:00
|
|
|
log.Warn("Failed to send stats to client", "err", err)
|
|
|
|
conn.Close()
|
|
|
|
continue
|
|
|
|
}
|
2017-10-17 02:08:57 -07:00
|
|
|
if err := send(conn, head, time.Second); err != nil {
|
2017-04-10 16:25:53 -07:00
|
|
|
log.Warn("Failed to send header to client", "err", err)
|
|
|
|
conn.Close()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
f.lock.RUnlock()
|
2018-03-02 01:57:11 -08:00
|
|
|
}
|
|
|
|
}()
|
|
|
|
// Wait for various events and assing to the appropriate background threads
|
|
|
|
for {
|
|
|
|
select {
|
|
|
|
case head := <-heads:
|
|
|
|
// New head arrived, send if for state update if there's none running
|
|
|
|
select {
|
|
|
|
case update <- head:
|
|
|
|
default:
|
|
|
|
}
|
2017-04-10 16:25:53 -07:00
|
|
|
|
|
|
|
case <-f.update:
|
|
|
|
// Pending requests updated, stream to clients
|
|
|
|
f.lock.RLock()
|
|
|
|
for _, conn := range f.conns {
|
2017-10-17 02:08:57 -07:00
|
|
|
if err := send(conn, map[string]interface{}{"requests": f.reqs}, time.Second); err != nil {
|
2017-04-10 16:25:53 -07:00
|
|
|
log.Warn("Failed to send requests to client", "err", err)
|
|
|
|
conn.Close()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
f.lock.RUnlock()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2017-10-16 06:30:13 -07:00
|
|
|
|
2017-10-17 02:08:57 -07:00
|
|
|
// sends transmits a data packet to the remote end of the websocket, but also
|
|
|
|
// setting a write deadline to prevent waiting forever on the node.
|
|
|
|
func send(conn *websocket.Conn, value interface{}, timeout time.Duration) error {
|
|
|
|
if timeout == 0 {
|
|
|
|
timeout = 60 * time.Second
|
|
|
|
}
|
|
|
|
conn.SetWriteDeadline(time.Now().Add(timeout))
|
|
|
|
return websocket.JSON.Send(conn, value)
|
|
|
|
}
|
|
|
|
|
|
|
|
// sendError transmits an error to the remote end of the websocket, also setting
|
|
|
|
// the write deadline to 1 second to prevent waiting forever.
|
|
|
|
func sendError(conn *websocket.Conn, err error) error {
|
|
|
|
return send(conn, map[string]string{"error": err.Error()}, time.Second)
|
|
|
|
}
|
|
|
|
|
|
|
|
// sendSuccess transmits a success message to the remote end of the websocket, also
|
|
|
|
// setting the write deadline to 1 second to prevent waiting forever.
|
|
|
|
func sendSuccess(conn *websocket.Conn, msg string) error {
|
|
|
|
return send(conn, map[string]string{"success": msg}, time.Second)
|
|
|
|
}
|
|
|
|
|
2017-10-16 06:30:13 -07:00
|
|
|
// authTwitter tries to authenticate a faucet request using Twitter posts, returning
|
|
|
|
// the username, avatar URL and Ethereum address to fund on success.
|
|
|
|
func authTwitter(url string) (string, string, common.Address, error) {
|
|
|
|
// Ensure the user specified a meaningful URL, no fancy nonsense
|
|
|
|
parts := strings.Split(url, "/")
|
|
|
|
if len(parts) < 4 || parts[len(parts)-2] != "status" {
|
|
|
|
return "", "", common.Address{}, errors.New("Invalid Twitter status URL")
|
|
|
|
}
|
|
|
|
// Twitter's API isn't really friendly with direct links. Still, we don't
|
|
|
|
// want to do ask read permissions from users, so just load the public posts and
|
|
|
|
// scrape it for the Ethereum address and profile URL.
|
|
|
|
res, err := http.Get(url)
|
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
defer res.Body.Close()
|
|
|
|
|
2018-02-22 03:20:36 -08:00
|
|
|
// Resolve the username from the final redirect, no intermediate junk
|
|
|
|
parts = strings.Split(res.Request.URL.String(), "/")
|
|
|
|
if len(parts) < 4 || parts[len(parts)-2] != "status" {
|
|
|
|
return "", "", common.Address{}, errors.New("Invalid Twitter status URL")
|
|
|
|
}
|
|
|
|
username := parts[len(parts)-3]
|
|
|
|
|
2017-12-21 04:14:24 -08:00
|
|
|
body, err := ioutil.ReadAll(res.Body)
|
2017-10-16 06:30:13 -07:00
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
address := common.HexToAddress(string(regexp.MustCompile("0x[0-9a-fA-F]{40}").Find(body)))
|
|
|
|
if address == (common.Address{}) {
|
|
|
|
return "", "", common.Address{}, errors.New("No Ethereum address found to fund")
|
|
|
|
}
|
|
|
|
var avatar string
|
|
|
|
if parts = regexp.MustCompile("src=\"([^\"]+twimg.com/profile_images[^\"]+)\"").FindStringSubmatch(string(body)); len(parts) == 2 {
|
|
|
|
avatar = parts[1]
|
|
|
|
}
|
|
|
|
return username + "@twitter", avatar, address, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// authGooglePlus tries to authenticate a faucet request using GooglePlus posts,
|
|
|
|
// returning the username, avatar URL and Ethereum address to fund on success.
|
|
|
|
func authGooglePlus(url string) (string, string, common.Address, error) {
|
|
|
|
// Ensure the user specified a meaningful URL, no fancy nonsense
|
|
|
|
parts := strings.Split(url, "/")
|
|
|
|
if len(parts) < 4 || parts[len(parts)-2] != "posts" {
|
|
|
|
return "", "", common.Address{}, errors.New("Invalid Google+ post URL")
|
|
|
|
}
|
|
|
|
username := parts[len(parts)-3]
|
|
|
|
|
|
|
|
// Google's API isn't really friendly with direct links. Still, we don't
|
|
|
|
// want to do ask read permissions from users, so just load the public posts and
|
|
|
|
// scrape it for the Ethereum address and profile URL.
|
|
|
|
res, err := http.Get(url)
|
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
defer res.Body.Close()
|
|
|
|
|
|
|
|
body, err := ioutil.ReadAll(res.Body)
|
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
address := common.HexToAddress(string(regexp.MustCompile("0x[0-9a-fA-F]{40}").Find(body)))
|
|
|
|
if address == (common.Address{}) {
|
|
|
|
return "", "", common.Address{}, errors.New("No Ethereum address found to fund")
|
|
|
|
}
|
|
|
|
var avatar string
|
|
|
|
if parts = regexp.MustCompile("src=\"([^\"]+googleusercontent.com[^\"]+photo.jpg)\"").FindStringSubmatch(string(body)); len(parts) == 2 {
|
|
|
|
avatar = parts[1]
|
|
|
|
}
|
|
|
|
return username + "@google+", avatar, address, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// authFacebook tries to authenticate a faucet request using Facebook posts,
|
|
|
|
// returning the username, avatar URL and Ethereum address to fund on success.
|
|
|
|
func authFacebook(url string) (string, string, common.Address, error) {
|
|
|
|
// Ensure the user specified a meaningful URL, no fancy nonsense
|
|
|
|
parts := strings.Split(url, "/")
|
|
|
|
if len(parts) < 4 || parts[len(parts)-2] != "posts" {
|
|
|
|
return "", "", common.Address{}, errors.New("Invalid Facebook post URL")
|
|
|
|
}
|
|
|
|
username := parts[len(parts)-3]
|
|
|
|
|
|
|
|
// Facebook's Graph API isn't really friendly with direct links. Still, we don't
|
|
|
|
// want to do ask read permissions from users, so just load the public posts and
|
|
|
|
// scrape it for the Ethereum address and profile URL.
|
|
|
|
res, err := http.Get(url)
|
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
defer res.Body.Close()
|
|
|
|
|
|
|
|
body, err := ioutil.ReadAll(res.Body)
|
|
|
|
if err != nil {
|
|
|
|
return "", "", common.Address{}, err
|
|
|
|
}
|
|
|
|
address := common.HexToAddress(string(regexp.MustCompile("0x[0-9a-fA-F]{40}").Find(body)))
|
|
|
|
if address == (common.Address{}) {
|
|
|
|
return "", "", common.Address{}, errors.New("No Ethereum address found to fund")
|
|
|
|
}
|
|
|
|
var avatar string
|
|
|
|
if parts = regexp.MustCompile("src=\"([^\"]+fbcdn.net[^\"]+)\"").FindStringSubmatch(string(body)); len(parts) == 2 {
|
|
|
|
avatar = parts[1]
|
|
|
|
}
|
|
|
|
return username + "@facebook", avatar, address, nil
|
|
|
|
}
|
2017-10-23 00:22:23 -07:00
|
|
|
|
|
|
|
// authNoAuth tries to interpret a faucet request as a plain Ethereum address,
|
|
|
|
// without actually performing any remote authentication. This mode is prone to
|
|
|
|
// Byzantine attack, so only ever use for truly private networks.
|
|
|
|
func authNoAuth(url string) (string, string, common.Address, error) {
|
|
|
|
address := common.HexToAddress(regexp.MustCompile("0x[0-9a-fA-F]{40}").FindString(url))
|
|
|
|
if address == (common.Address{}) {
|
|
|
|
return "", "", common.Address{}, errors.New("No Ethereum address found to fund")
|
|
|
|
}
|
|
|
|
return address.Hex() + "@noauth", "", address, nil
|
|
|
|
}
|