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package pushrules
import (
"fmt"
"regexp"
)
// ValidateRule checks the rule for errors. These follow from Sytests
// and the specification.
func ValidateRule(kind Kind, rule *Rule) []error {
var errs []error
if len(rule.RuleID) > 0 && rule.RuleID[:1] == "." {
errs = append(errs, fmt.Errorf("invalid rule ID: rule can not start with a dot"))
}
if !validRuleIDRE.MatchString(rule.RuleID) {
errs = append(errs, fmt.Errorf("invalid rule ID: %s", rule.RuleID))
}
if len(rule.Actions) == 0 {
errs = append(errs, fmt.Errorf("missing actions"))
}
for _, action := range rule.Actions {
errs = append(errs, validateAction(action)...)
}
for _, cond := range rule.Conditions {
errs = append(errs, validateCondition(cond)...)
}
switch kind {
case OverrideKind, UnderrideKind:
// The empty list is allowed, but for JSON-encoding reasons,
// it must not be nil.
if rule.Conditions == nil {
errs = append(errs, fmt.Errorf("missing rule conditions"))
}
case ContentKind:
if rule.Pattern == nil {
errs = append(errs, fmt.Errorf("missing content rule pattern"))
}
if rule.Pattern != nil && *rule.Pattern == "" {
errs = append(errs, fmt.Errorf("missing content rule pattern"))
}
case RoomKind, SenderKind:
// Do nothing.
default:
errs = append(errs, fmt.Errorf("invalid rule kind: %s", kind))
}
return errs
}
// validRuleIDRE is a regexp for valid IDs.
//
// TODO: the specification doesn't seem to say what the rule ID syntax
// is. A Sytest fails if it contains a backslash.
var validRuleIDRE = regexp.MustCompile(`^([^\\]+)$`)
// validateAction returns issues with an Action.
func validateAction(action *Action) []error {
var errs []error
switch action.Kind {
case NotifyAction, DontNotifyAction, CoalesceAction, SetTweakAction:
// Do nothing.
default:
errs = append(errs, fmt.Errorf("invalid rule action kind: %s", action.Kind))
}
return errs
}
// validateCondition returns issues with a Condition.
func validateCondition(cond *Condition) []error {
var errs []error
switch cond.Kind {
case EventMatchCondition, ContainsDisplayNameCondition, RoomMemberCountCondition, SenderNotificationPermissionCondition:
// Do nothing.
default:
errs = append(errs, fmt.Errorf("invalid rule condition kind: %s", cond.Kind))
}
return errs
}
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