refactor: split BMC data structures into pkg/bmc package

pkg/bmc/bmc.go

@@ -0,0 +1,45 @@
+package bmc
+
+import (
+	"encoding/json"
+
+	"github.com/OpenCHAMI/magellan/pkg/secrets"
+	"github.com/rs/zerolog/log"
+)
+
+type BMCCredentials struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+func GetBMCCredentials(store secrets.SecretStore, id string) (BMCCredentials, error) {
+	var creds BMCCredentials
+	if uriCreds, err := store.GetSecretByID(id); err != nil {
+		// Specific credentials for URI not found, fetch default.
+		log.Warn().Str("id", id).Msg("specific credentials not found, falling back to default")
+		defaultSecret, err := store.GetSecretByID(secrets.DEFAULT_KEY)
+		if err != nil {
+			// We've exhausted all options, the credentials will be blank unless
+			// overridden by a CLI flag.
+			log.Warn().Str("id", id).Err(err).Msg("no default credentials were set, they will be blank unless overridden by CLI flags")
+		} else {
+			// Default credentials found, use them.
+			if err = json.Unmarshal([]byte(defaultSecret), &creds); err != nil {
+				log.Warn().Str("id", id).Err(err).Msg("failed to unmarshal default secrets store credentials")
+				return creds, err
+			} else {
+				log.Info().Str("id", id).Msg("default credentials found, using")
+			}
+		}
+	} else {
+		// Specific URI credentials found, use them.
+		if err = json.Unmarshal([]byte(uriCreds), &creds); err != nil {
+			log.Warn().Str("id", id).Err(err).Msg("failed to unmarshal specific credentials")
+			return creds, err
+		} else {
+			log.Info().Str("id", id).Msg("specific credentials found, using")
+		}
+	}
+
+	return creds, nil
+}