First implementation of new config format

- Functionally equivalent to old version at present
- Temperature and Humidity sensors not handled yet
- Moved HTTP handlers around

util/credentials.go

@@ -0,0 +1,20 @@
+package util
+
+import (
+	"gitlab.hamburg.ccc.de/ccchh/spaceapid/config"
+)
+
+// CheckCredentials validates whether a given username/password pair matches an
+// entry in the authDB whose id is present in the validCredentials list
+func CheckCredentials(
+	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID, username, password string,
+) bool {
+	for _, id := range validCredentials {
+		if cred, present := authDB[id]; present {
+			if cred.Username == username && cred.Password == password {
+				return true
+			}
+		}
+	}
+	return false
+}