Let's Encryptを使ってセキュアなHTTPS通信を実現しよう！(Go echoの場合)

$ wget https://bootstrap.pypa.io/get-pip.py
$ python get-pip.py

pip install virtualenv

wget https://dl.eff.org/certbot-auto
chmod a+x certbot-auto

./certbot-auto --no-bootstrap
./certbot-auto certonly

How would you like to authenticate with the ACME CA?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 1

Plugins selected: Authenticator standalone, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): address

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(A)gree/(C)ancel: a

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(Y)es/(N)o: y
Please enter in your domain name(s) (comma and/or space separated)  (Enter 'c'
to cancel): server.developerkikikaikaienjoy.work

IMPORTANT NOTES:
 - Your account credentials have been saved in your Certbot
   configuration directory at /etc/letsencrypt. You should make a
   secure backup of this folder now. This configuration directory will
   also contain certificates and private keys obtained by Certbot so
   making regular backups of this folder is ideal.

# ./certbot-auto certonly
...

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/server.developerkikikaikaienjoy.work/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/server.developerkikikaikaienjoy.work/privkey.pem
   Your cert will expire on 2019-04-26. To obtain a new or tweaked
   version of this certificate in the future, simply run certbot-auto
   again. To non-interactively renew *all* of your certificates, run
   "certbot-auto renew"
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

-       e.Start(":80" )
+       e.StartTLS(":443", "/dir_of_pem/fullchain.pem", "/dir_of_pem/privkey.pem")

diff --git a/echo.go b/echo.go
index f0b6284..6d1f714 100644
--- a/echo.go
+++ b/echo.go
@@ -604,13 +604,25 @@ func (e *Echo) Start(address string) error {
        return e.StartServer(e.Server)
 }

+func (e *Echo)generateInstanceOfsTLSConfig() {
+       s := e.TLSServer
+       if s.TLSConfig == nil {
+               s.TLSConfig = new(tls.Config)
+       }
+}
+
+func (e *Echo)SetTLSCipherSuites(cipherSuites []uint16) {
+       e.generateInstanceOfsTLSConfig();
+       e.TLSServer.TLSConfig.CipherSuites = cipherSuites;
+}
+
 // StartTLS starts an HTTPS server.
 func (e *Echo) StartTLS(address string, certFile, keyFile string) (err error) {
        if certFile == "" || keyFile == "" {
                return errors.New("invalid tls configuration")
        }
        s := e.TLSServer
-       s.TLSConfig = new(tls.Config)
+       e.generateInstanceOfsTLSConfig();
        s.TLSConfig.Certificates = make([]tls.Certificate, 1)
        s.TLSConfig.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
        if err != nil {

ssl_session_cache shared:SSL:50m;
ssl_session_timeout 5m;