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|
package route53
import (
"context"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/fall"
clog "github.com/coredns/coredns/plugin/pkg/log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/defaults"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/aws/aws-sdk-go/service/route53/route53iface"
)
var log = clog.NewWithPlugin("route53")
func init() { plugin.Register("route53", setup) }
// exposed for testing
var f = func(opts session.Options) route53iface.Route53API {
return route53.New(session.Must(session.NewSessionWithOptions(opts)))
}
func setup(c *caddy.Controller) error {
for c.Next() {
keyPairs := map[string]struct{}{}
keys := map[string][]string{}
// Route53 plugin attempts to load AWS credentials following default SDK chaining.
// The order configuration is loaded in is:
// * Static AWS keys set in Corefile (deprecated)
// * Environment Variables
// * Shared Credentials file
// * Shared Configuration file (if AWS_SDK_LOAD_CONFIG is set to truthy value)
// * EC2 Instance Metadata (credentials only)
opts := session.Options{}
var fall fall.F
refresh := time.Duration(1) * time.Minute // default update frequency to 1 minute
args := c.RemainingArgs()
for i := 0; i < len(args); i++ {
parts := strings.SplitN(args[i], ":", 2)
if len(parts) != 2 {
return plugin.Error("route53", c.Errf("invalid zone %q", args[i]))
}
dns, hostedZoneID := parts[0], parts[1]
if dns == "" || hostedZoneID == "" {
return plugin.Error("route53", c.Errf("invalid zone %q", args[i]))
}
if _, ok := keyPairs[args[i]]; ok {
return plugin.Error("route53", c.Errf("conflict zone %q", args[i]))
}
keyPairs[args[i]] = struct{}{}
keys[dns] = append(keys[dns], hostedZoneID)
}
for c.NextBlock() {
switch c.Val() {
case "aws_access_key":
v := c.RemainingArgs()
if len(v) < 2 {
return plugin.Error("route53", c.Errf("invalid access key: '%v'", v))
}
opts.Config.Credentials = credentials.NewStaticCredentials(v[0], v[1], "")
log.Warningf("Save aws_access_key in Corefile has been deprecated, please use other authentication methods instead")
case "aws_endpoint":
if c.NextArg() {
opts.Config.Endpoint = aws.String(c.Val())
} else {
return plugin.Error("route53", c.ArgErr())
}
case "upstream":
c.RemainingArgs() // eats args
case "credentials":
if c.NextArg() {
opts.Profile = c.Val()
} else {
return c.ArgErr()
}
if c.NextArg() {
opts.SharedConfigFiles = []string{c.Val()}
// If AWS_SDK_LOAD_CONFIG is set also load ~/.aws/config to stay consistent
// with default SDK behavior.
if ok, _ := strconv.ParseBool(os.Getenv("AWS_SDK_LOAD_CONFIG")); ok {
opts.SharedConfigFiles = append(opts.SharedConfigFiles, defaults.SharedConfigFilename())
}
}
case "fallthrough":
fall.SetZonesFromArgs(c.RemainingArgs())
case "refresh":
if c.NextArg() {
refreshStr := c.Val()
_, err := strconv.Atoi(refreshStr)
if err == nil {
refreshStr = fmt.Sprintf("%ss", c.Val())
}
refresh, err = time.ParseDuration(refreshStr)
if err != nil {
return plugin.Error("route53", c.Errf("Unable to parse duration: %v", err))
}
if refresh <= 0 {
return plugin.Error("route53", c.Errf("refresh interval must be greater than 0: %q", refreshStr))
}
} else {
return plugin.Error("route53", c.ArgErr())
}
default:
return plugin.Error("route53", c.Errf("unknown property %q", c.Val()))
}
}
client := f(opts)
ctx, cancel := context.WithCancel(context.Background())
h, err := New(ctx, client, keys, refresh)
if err != nil {
cancel()
return plugin.Error("route53", c.Errf("failed to create route53 plugin: %v", err))
}
h.Fall = fall
if err := h.Run(ctx); err != nil {
cancel()
return plugin.Error("route53", c.Errf("failed to initialize route53 plugin: %v", err))
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
h.Next = next
return h
})
c.OnShutdown(func() error { cancel(); return nil })
}
return nil
}
|
