Added BasicAuth to admin handlers. (SommerEngineering/KPIManager#8)

Handlers/AddHandler.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/SommerEngineering/Ocean/ConfigurationDB"
 	"github.com/SommerEngineering/Ocean/Log"
 	LM "github.com/SommerEngineering/Ocean/Log/Meta"
 )
@@ -33,5 +34,5 @@ func AddAdminHandler(pattern string, handler func(http.ResponseWriter, *http.Req
 	}()
 
 	// Add the handler:
-	muxAdmin.HandleFunc(pattern, handler)
+	muxAdmin.HandleFunc(pattern, BasicAuth(handler, `admin`, ConfigurationDB.Read(`AdminWebServerEnabled`), `Please enter your username and password for this site`))
 }

Handlers/BasicAuth.go

@@ -0,0 +1,30 @@
+package Handlers
+
+import (
+	"crypto/subtle"
+	"net/http"
+)
+
+// BasicAuth wraps a handler requiring HTTP basic auth for it using the given
+// username and password and the specified realm, which shouldn't contain quotes.
+//
+// Most web browser display a dialog with something like:
+//
+//    The website says: "<realm>"
+//
+// Which is really stupid so you may want to set the realm to a message rather than
+// an actual realm.
+//
+// Taken from on http://stackoverflow.com/questions/21936332/idiomatic-way-of-requiring-http-basic-auth-in-go/39591234#39591234
+func BasicAuth(handler http.HandlerFunc, username, password, realm string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		user, pass, ok := r.BasicAuth()
+		if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 {
+			w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`)
+			w.WriteHeader(401)
+			w.Write([]byte(http.StatusText(401)))
+			return
+		}
+		handler(w, r)
+	}
+}