Initial QSfera import

Server/services/notifications/pkg/config/parser/parse.go

@@ -0,0 +1,77 @@
+package parser
+
+import (
+	"errors"
+	"fmt"
+	"net/mail"
+	"strings"
+
+	occfg "github.com/qsfera/server/pkg/config"
+	"github.com/qsfera/server/pkg/config/envdecode"
+	"github.com/qsfera/server/pkg/log"
+	"github.com/qsfera/server/pkg/shared"
+	"github.com/qsfera/server/services/notifications/pkg/config"
+	"github.com/qsfera/server/services/notifications/pkg/config/defaults"
+)
+
+// ParseConfig loads configuration from known paths.
+func ParseConfig(cfg *config.Config) error {
+	err := occfg.BindSourcesToStructs(cfg.Service.Name, cfg)
+	if err != nil {
+		return err
+	}
+
+	defaults.EnsureDefaults(cfg)
+
+	// load all env variables relevant to the config in the current context.
+	if err := envdecode.Decode(cfg); err != nil {
+		// no environment variable set for this config is an expected "error"
+		if !errors.Is(err, envdecode.ErrNoTargetFieldsAreSet) {
+			return err
+		}
+	}
+
+	defaults.Sanitize(cfg)
+
+	return Validate(cfg)
+}
+
+func Validate(cfg *config.Config) error {
+	logger := log.Configure(cfg.Service.Name, cfg.Commons, cfg.LogLevel)
+
+	if cfg.Notifications.SMTP.Host != "" {
+		switch cfg.Notifications.SMTP.Encryption {
+		case "tls":
+			logger.Warn().Msg("The smtp_encryption value 'tls' is deprecated. Please use the value 'starttls' instead.")
+		case "ssl":
+			logger.Warn().Msg("The smtp_encryption value 'ssl' is deprecated. Please use the value 'ssltls' instead.")
+		case "starttls", "ssltls", "none":
+			break
+		default:
+			return fmt.Errorf(
+				"unknown value '%s' for 'smtp_encryption' in service %s. Allowed values are 'starttls', 'ssltls' or 'none'",
+				cfg.Notifications.SMTP.Encryption, cfg.Service.Name,
+			)
+		}
+	}
+
+	{
+		if strings.TrimSpace(cfg.Notifications.SMTP.Sender) == "" {
+			return fmt.Errorf("the 'smtp_sender' must be a valid single RFC 5322 address. parsing error: the address cannot be empty")
+		}
+		if s, err := mail.ParseAddress(cfg.Notifications.SMTP.Sender); err == nil {
+			cfg.Notifications.SMTP.Sender = s.String()
+		} else {
+			return fmt.Errorf("the 'smtp_sender' must be a valid single RFC 5322 address. parsing error %w", err)
+		}
+	}
+
+	if cfg.ServiceAccount.ServiceAccountID == "" {
+		return shared.MissingServiceAccountID(cfg.Service.Name)
+	}
+	if cfg.ServiceAccount.ServiceAccountSecret == "" {
+		return shared.MissingServiceAccountSecret(cfg.Service.Name)
+	}
+
+	return nil
+}