82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package main
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import (
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"github.com/hashicorp/consul/api"
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"errors"
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"log"
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"fmt"
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"os"
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"encoding/base64"
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/*"github.com/aws/aws-sdk-go/service/s3"*/
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)
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const consul_addr string = "KV2S3_CONSUL_ADDR"
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const enc_key string = "KV2S3_ENC_KEY"
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const key_exp_bits int = 256
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const key_exp_bytes int = key_exp_bits / 8
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func errIsPanic(err error, format string, a ...interface{}) {
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if err != nil {
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log.Panicf(format, a...)
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}
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}
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func absentIsErr(present bool) error {
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if !present {
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return errors.New("Environement variable is not set.")
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}
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return nil
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}
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func main() {
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log.Println("starting consul kv backup...")
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//--- Ask Consul to Snapshot our KV
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var present bool
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conf := api.DefaultConfig()
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conf.Address, present = os.LookupEnv(consul_addr)
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err := absentIsErr(present)
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errIsPanic(err, "%v env required. %v", consul_addr, err)
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//@FIXME add later support for HTTPS
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options := api.QueryOptions {
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// Prevent from backuping forever silently a desynchronized node
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AllowStale: false,
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}
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consul, err := api.NewClient(conf)
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errIsPanic(err, "Unable to build a new client. %v", err)
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reader, _, err := consul.Snapshot().Save(&options)
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errIsPanic(err, "Snapshot failed. %v", err)
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//--- Get encryption key and check it
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b64_key, present := os.LookupEnv(enc_key)
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err = absentIsErr(present)
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errIsPanic(err, "%v env required. %v", enc_key, err)
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raw_key, err := base64.StdEncoding.DecodeString(b64_key)
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errIsPanic(err, "Unable to decode base64 key. %v", err)
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err = nil
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key_size_bytes := len(raw_key)
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key_size_bits := key_size_bytes
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if key_size_bytes != key_exp_bytes {
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msg := fmt.Sprintf(
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"Key size is %d bits (%d bytes) instead of %d bits (%d bytes).",
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key_size_bits,
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key_size_bytes,
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key_exp_bits,
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key_exp_bytes)
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err = errors.New(msg)
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}
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errIsPanic(err, "We deliberately support only 256 bits (32 bytes) keys. %v", err)
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//--- Encryption
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// Not a simple thing to do it in a streaming manner - is it only a good idea?
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// https://neilmadden.blog/2019/12/30/a-few-comments-on-age/
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// https://moxie.org/2011/12/13/the-cryptographic-doom-principle.html
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}
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