Set the session key from an env variable

README.md

@@ -29,12 +29,19 @@ $ echo "CREATE EXTENSION pg_trgm;"|psql trantor
 
 Now you can install Trantor itself:
 ```
-# go get gitlab.com/trantor/trantor
+$ git clone gitlab.com/trantor/trantor
+$ cd trantor
+$ go build
+```
+
+Generate a random session key:
+```
+$ base64 /dev/random | head -c 50
 ```
 
 You can run it (using `/var/lib/trantor` for storage):
 ```
-# $GOPATH/bin/trantor -assets $GOPATH/src/pkg/gitlab.com/trantor/trantor/ -store /var/lib/trantor
+$ SESSION_KEY=<session> ./trantor -store /var/lib/trantor
 ```
 
 The first time you run it, the database will be initialized. To initialize an admin user, include the -set-admin-user and -set-admin-pass variables

lib/session.go

@@ -3,13 +3,14 @@ package trantor
 import (
 	"encoding/hex"
 	"net/http"
+	"os"
 
 	"github.com/gorilla/securecookie"
 	"github.com/gorilla/sessions"
 	"gitlab.com/trantor/trantor/lib/database"
 )
 
-var sesStore = sessions.NewCookieStore(securecookie.GenerateRandomKey(64))
+var sesStore = sessions.NewCookieStore([]byte(os.Getenv("SESSION_KEY")))
 
 type Notification struct {
 	Title string