func validate()

in registry/registry.go [599:668]
49 lines of code
22 McCabe index (conditional complexity)

func validate(config *configuration.Configuration) error {
	var errs *multierror.Error

	// Validate redirect section.
	if redirectConfig, ok := config.Storage["redirect"]; ok {
		if v, ok := redirectConfig["disable"]; ok {
			if _, ok := v.(bool); !ok {
				errs = multierror.Append(fmt.Errorf("invalid type %[1]T for 'storage.redirect.disable' (boolean)", v))
			}
		}
		if v, ok := redirectConfig["expirydelay"]; ok {
			switch val := v.(type) {
			case time.Duration:
			case string:
				// nolint: revive // max-control-nesting
				if _, err := time.ParseDuration(val); err != nil {
					errs = multierror.Append(fmt.Errorf("%q value for 'storage.redirect.expirydelay' is not a valid duration", val))
				}
			default:
				errs = multierror.Append(fmt.Errorf("invalid type %[1]T for 'storage.redirect.expirydelay' (duration)", v))
			}
		}
	}

	//  Validate and/or Log potential issues with azure `trimlegacyrootprefix` and `legacyrootprefix` configuration options.
	if ac, ok := config.Storage["azure"]; ok {
		var legacyPrefix, legacyPrefixIsBool, trimLegacyPrefix, trimLegacyPrefixIsBool bool

		// assert `trimlegacyrootprefix` can be represented as a boolean
		trimLegacyPrefixI, trimLegacyPrefixExist := ac["trimlegacyrootprefix"]
		if trimLegacyPrefixExist {
			if trimLegacyPrefix, trimLegacyPrefixIsBool = trimLegacyPrefixI.(bool); !trimLegacyPrefixIsBool {
				errs = multierror.Append(fmt.Errorf("invalid type %[1]T for 'storage.azure.trimlegacyrootprefix' (boolean)", trimLegacyPrefix))
			}
		}

		// assert `legacyrootprefix` can be represented as a boolean
		legacyPrefixI, legacyPrefixExist := ac["legacyrootprefix"]
		if legacyPrefixExist {
			if legacyPrefix, legacyPrefixIsBool = legacyPrefixI.(bool); !legacyPrefixIsBool {
				errs = multierror.Append(fmt.Errorf("invalid type %[1]T for 'storage.azure.legacyrootprefix' (boolean)", legacyPrefix))
			}
		}

		switch {
		// both parameters exist, check for conflict:
		case trimLegacyPrefixExist && legacyPrefixExist:
			// while it is allowed to set both configs (as long as they do not conflict), setting only one is sufficient.
			dlog.GetLogger().Warn("Both 'storage.azure.legacyrootprefix' and 'storage.azure.trimlegacyrootprefix' are set. It is recommended to set one or the other, rather than both.")

			// conflict: user explicitly enabled legacyrootprefix but also enabled trimlegacyrootprefix (or disabled both).
			if legacyPrefixIsBool && trimLegacyPrefixIsBool {
				// nolint: revive // max-control-nesting
				if legacyPrefix == trimLegacyPrefix {
					errs = multierror.Append(fmt.Errorf("storage.azure.trimlegacyrootprefix' and  'storage.azure.trimlegacyrootprefix' can not both be %v", legacyPrefix))
				}
			}

		// both parameters do not exist, warn user that we will be using the default (i.e storage.azure.legacyrootprefix=false aka storage.azure.trimlegacyrootprefix=true):
		case !trimLegacyPrefixExist && !legacyPrefixExist:
			dlog.GetLogger().Warn("A configuration parameter for 'storage.azure.legacyrootprefix' or 'storage.azure.trimlegacyrootprefix' was not specified. The azure driver will default to using the standard root prefix: \"/\" ")

		// one parameter does not exist, while the other does
		case !trimLegacyPrefixExist || !legacyPrefixExist:
			// nothing to do here
		}
	}

	return errs.ErrorOrNil()
}