[core] Adding toggle for CORS, GZIP in admin/cms configuration (#30)

This PR enables admins to disable/enable CORS and GZIP from within the admin CMS configuration page. Both are enabled by default.

Note: currently, the GZIP implementation is 100% on the fly, for every qualifying API endpoint request. This could add significant CPU usage, but dramatically decreases bandwidth. Will be considering other better implementations, but for now YMMV.

Possible optimizations:
- pooling gzip Writers vs. creating a new one for each response
- caching gzipped responses (in memory? on disk?) 
- enforcing size threshold (only gzip content larger than N bytes) 

1 files changed, 14 insertions, 22 deletions

diff --git a/system/db/init.go b/system/db/init.go
index eaf6d76..9125d3b 100644
--- a/system/db/init.go
+++ b/system/db/init.go
@@ -1,10 +1,8 @@
 package db
 
 import (
-	"encoding/json"
 	"log"
 
-	"github.com/ponzu-cms/ponzu/system/admin/config"
 	"github.com/ponzu-cms/ponzu/system/item"
 
 	"github.com/boltdb/bolt"
@@ -57,32 +55,23 @@ func Init() {
 			}
 		}
 
-		// seed db with configs structure if not present
-		b := tx.Bucket([]byte("__config"))
-		if b.Get([]byte("settings")) == nil {
-			j, err := json.Marshal(&config.Config{})
-			if err != nil {
-				return err
-			}
-
-			err = b.Put([]byte("settings"), j)
-			if err != nil {
-				return err
-			}
-		}
-
-		clientSecret := ConfigCache("client_secret")
-
-		if clientSecret != "" {
-			jwt.Secret([]byte(clientSecret))
-		}
-
 		return nil
 	})
 	if err != nil {
 		log.Fatalln("Coudn't initialize db with buckets.", err)
 	}
 
+	err = LoadCacheConfig()
+	if err != nil {
+		log.Fatalln("Failed to load config cache.", err)
+	}
+
+	clientSecret := ConfigCache("client_secret").(string)
+
+	if clientSecret != "" {
+		jwt.Secret([]byte(clientSecret))
+	}
+
 	// invalidate cache on system start
 	err = InvalidateCache()
 	if err != nil {
@@ -103,6 +92,9 @@ func SystemInitComplete() bool {
 
 	err := store.View(func(tx *bolt.Tx) error {
 		users := tx.Bucket([]byte("__users"))
+		if users == nil {
+			return bolt.ErrBucketNotFound
+		}
 
 		err := users.ForEach(func(k, v []byte) error {
 			complete = true