forked from cerc-io/plugeth
261 lines
7.5 KiB
Go
261 lines
7.5 KiB
Go
// Copyright 2019 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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package main
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import (
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"errors"
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"fmt"
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"strconv"
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"strings"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/session"
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"github.com/aws/aws-sdk-go/service/route53"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/dnsdisc"
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"gopkg.in/urfave/cli.v1"
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)
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var (
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route53AccessKeyFlag = cli.StringFlag{
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Name: "access-key-id",
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Usage: "AWS Access Key ID",
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EnvVar: "AWS_ACCESS_KEY_ID",
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}
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route53AccessSecretFlag = cli.StringFlag{
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Name: "access-key-secret",
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Usage: "AWS Access Key Secret",
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EnvVar: "AWS_SECRET_ACCESS_KEY",
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}
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route53ZoneIDFlag = cli.StringFlag{
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Name: "zone-id",
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Usage: "Route53 Zone ID",
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}
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)
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type route53Client struct {
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api *route53.Route53
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zoneID string
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}
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// newRoute53Client sets up a Route53 API client from command line flags.
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func newRoute53Client(ctx *cli.Context) *route53Client {
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akey := ctx.String(route53AccessKeyFlag.Name)
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asec := ctx.String(route53AccessSecretFlag.Name)
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if akey == "" || asec == "" {
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exit(fmt.Errorf("need Route53 Access Key ID and secret proceed"))
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}
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config := &aws.Config{Credentials: credentials.NewStaticCredentials(akey, asec, "")}
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session, err := session.NewSession(config)
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if err != nil {
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exit(fmt.Errorf("can't create AWS session: %v", err))
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}
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return &route53Client{
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api: route53.New(session),
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zoneID: ctx.String(route53ZoneIDFlag.Name),
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}
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}
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// deploy uploads the given tree to Route53.
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func (c *route53Client) deploy(name string, t *dnsdisc.Tree) error {
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if err := c.checkZone(name); err != nil {
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return err
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}
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// Compute DNS changes.
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records := t.ToTXT(name)
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changes, err := c.computeChanges(name, records)
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if err != nil {
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return err
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}
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if len(changes) == 0 {
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log.Info("No DNS changes needed")
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return nil
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}
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// Submit change request.
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log.Info(fmt.Sprintf("Submitting %d changes to Route53", len(changes)))
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batch := new(route53.ChangeBatch)
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batch.SetChanges(changes)
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batch.SetComment(fmt.Sprintf("enrtree update of %s at seq %d", name, t.Seq()))
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req := &route53.ChangeResourceRecordSetsInput{HostedZoneId: &c.zoneID, ChangeBatch: batch}
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resp, err := c.api.ChangeResourceRecordSets(req)
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if err != nil {
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return err
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}
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// Wait for the change to be applied.
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log.Info(fmt.Sprintf("Waiting for change request %s", *resp.ChangeInfo.Id))
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wreq := &route53.GetChangeInput{Id: resp.ChangeInfo.Id}
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return c.api.WaitUntilResourceRecordSetsChanged(wreq)
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}
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// checkZone verifies zone information for the given domain.
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func (c *route53Client) checkZone(name string) (err error) {
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if c.zoneID == "" {
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c.zoneID, err = c.findZoneID(name)
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}
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return err
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}
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// findZoneID searches for the Zone ID containing the given domain.
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func (c *route53Client) findZoneID(name string) (string, error) {
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log.Info(fmt.Sprintf("Finding Route53 Zone ID for %s", name))
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var req route53.ListHostedZonesByNameInput
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for {
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resp, err := c.api.ListHostedZonesByName(&req)
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if err != nil {
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return "", err
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}
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for _, zone := range resp.HostedZones {
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if isSubdomain(name, *zone.Name) {
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return *zone.Id, nil
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}
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}
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if !*resp.IsTruncated {
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break
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}
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req.DNSName = resp.NextDNSName
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req.HostedZoneId = resp.NextHostedZoneId
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}
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return "", errors.New("can't find zone ID for " + name)
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}
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// computeChanges creates DNS changes for the given record.
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func (c *route53Client) computeChanges(name string, records map[string]string) ([]*route53.Change, error) {
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// Convert all names to lowercase.
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lrecords := make(map[string]string, len(records))
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for name, r := range records {
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lrecords[strings.ToLower(name)] = r
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}
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records = lrecords
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// Get existing records.
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existing, err := c.collectRecords(name)
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if err != nil {
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return nil, err
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}
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log.Info(fmt.Sprintf("Found %d TXT records", len(existing)))
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var changes []*route53.Change
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for path, val := range records {
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ttl := 1
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if path != name {
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ttl = 2147483647
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}
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prevRecords, exists := existing[path]
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prevValue := combineTXT(prevRecords)
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if !exists {
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// Entry is unknown, push a new one
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log.Info(fmt.Sprintf("Creating %s = %q", path, val))
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changes = append(changes, newTXTChange("CREATE", path, ttl, splitTXT(val)))
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} else if prevValue != val {
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// Entry already exists, only change its content.
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log.Info(fmt.Sprintf("Updating %s from %q to %q", path, prevValue, val))
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changes = append(changes, newTXTChange("UPSERT", path, ttl, splitTXT(val)))
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} else {
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log.Info(fmt.Sprintf("Skipping %s = %q", path, val))
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}
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}
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// Iterate over the old records and delete anything stale.
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for path, values := range existing {
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if _, ok := records[path]; ok {
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continue
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}
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// Stale entry, nuke it.
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log.Info(fmt.Sprintf("Deleting %s = %q", path, combineTXT(values)))
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changes = append(changes, newTXTChange("DELETE", path, 1, values))
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}
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return changes, nil
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}
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// collectRecords collects all TXT records below the given name.
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func (c *route53Client) collectRecords(name string) (map[string][]string, error) {
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log.Info(fmt.Sprintf("Retrieving existing TXT records on %s (%s)", name, c.zoneID))
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var req route53.ListResourceRecordSetsInput
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req.SetHostedZoneId(c.zoneID)
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existing := make(map[string][]string)
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err := c.api.ListResourceRecordSetsPages(&req, func(resp *route53.ListResourceRecordSetsOutput, last bool) bool {
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for _, set := range resp.ResourceRecordSets {
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if !isSubdomain(*set.Name, name) || *set.Type != "TXT" {
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continue
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}
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name := strings.TrimSuffix(*set.Name, ".")
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for _, rec := range set.ResourceRecords {
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existing[name] = append(existing[name], *rec.Value)
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}
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}
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return true
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})
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return existing, err
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}
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// newTXTChange creates a change to a TXT record.
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func newTXTChange(action, name string, ttl int, values []string) *route53.Change {
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var c route53.Change
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var r route53.ResourceRecordSet
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var rrs []*route53.ResourceRecord
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for _, val := range values {
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rr := new(route53.ResourceRecord)
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rr.SetValue(val)
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rrs = append(rrs, rr)
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}
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r.SetType("TXT")
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r.SetName(name)
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r.SetTTL(int64(ttl))
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r.SetResourceRecords(rrs)
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c.SetAction(action)
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c.SetResourceRecordSet(&r)
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return &c
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}
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// isSubdomain returns true if name is a subdomain of domain.
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func isSubdomain(name, domain string) bool {
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domain = strings.TrimSuffix(domain, ".")
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name = strings.TrimSuffix(name, ".")
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return strings.HasSuffix("."+name, "."+domain)
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}
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// combineTXT concatenates the given quoted strings into a single unquoted string.
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func combineTXT(values []string) string {
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result := ""
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for _, v := range values {
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if v[0] == '"' {
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v = v[1 : len(v)-1]
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}
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result += v
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}
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return result
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}
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// splitTXT splits value into a list of quoted 255-character strings.
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func splitTXT(value string) []string {
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var result []string
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for len(value) > 0 {
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rlen := len(value)
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if rlen > 253 {
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rlen = 253
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}
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result = append(result, strconv.Quote(value[:rlen]))
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value = value[rlen:]
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}
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return result
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}
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