[core] Add config validation command

- Fix missing field validation for required fields
- Add validation of template fields
- Report all issues in configuration

Signed-off-by: Knut Ahlers <knut@ahlers.me>

README.md

@@ -37,6 +37,7 @@ Supported sub-commands are:
   actor-docs                     Generate markdown documentation for available actors
   api-token <name> <scope...>    Generate an api-token to be entered into the config
   migrate-v2 <old file>          Migrate old (*.json.gz) storage file into new database
+  validate-config                Try to load configuration file and report errors if any
   help                           Prints this help message
 ```
 

action_script.go

@@ -124,10 +124,17 @@ func (a ActorScript) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eve
 func (a ActorScript) IsAsync() bool { return false }
 func (a ActorScript) Name() string  { return "script" }
 
-func (a ActorScript) Validate(attrs *plugins.FieldCollection) (err error) {
-	if cmd, err := attrs.StringSlice("command"); err != nil || len(cmd) == 0 {
+func (a ActorScript) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
+	cmd, err := attrs.StringSlice("command")
+	if err != nil || len(cmd) == 0 {
 		return errors.New("command must be slice of strings with length > 0")
 	}
 
+	for i, el := range cmd {
+		if err = tplValidator(el); err != nil {
+			return errors.Wrapf(err, "validating cmd template (element %d)", i)
+		}
+	}
+
 	return nil
 }

config.go

@@ -357,21 +357,34 @@ func (c *configFile) updateAutoMessagesFromConfig(old *configFile) {
 }
 
 func (c configFile) validateRuleActions() error {
+	var hasError bool
+
 	for _, r := range c.Rules {
 		logger := log.WithField("rule", r.MatcherID())
+
+		if err := r.Validate(validateTemplate); err != nil {
+			logger.WithError(err).Error("Rule reported invalid config")
+			hasError = true
+		}
+
 		for idx, a := range r.Actions {
 			actor, err := getActorByName(a.Type)
 			if err != nil {
 				logger.WithField("index", idx).WithError(err).Error("Cannot get actor by type")
-				return errors.Wrap(err, "getting actor by type")
+				hasError = true
+				continue
 			}
 
-			if err = actor.Validate(a.Attributes); err != nil {
+			if err = actor.Validate(validateTemplate, a.Attributes); err != nil {
 				logger.WithField("index", idx).WithError(err).Error("Actor reported invalid config")
-				return errors.Wrap(err, "validating action attributes")
+				hasError = true
 			}
 		}
 	}
 
+	if hasError {
+		return errors.New("config validation reported errors, see log")
+	}
+
 	return nil
 }

internal/actors/ban/actor.go

@@ -103,7 +103,18 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) { return nil }
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
+	reasonTemplate, err := attrs.String("reason")
+	if err != nil || reasonTemplate == "" {
+		return errors.New("reason must be non-empty string")
+	}
+
+	if err = tplValidator(reasonTemplate); err != nil {
+		return errors.Wrap(err, "validating reason template")
+	}
+
+	return nil
+}
 
 func handleAPIBan(w http.ResponseWriter, r *http.Request) {
 	var (

internal/actors/counter/actor.go

@@ -187,11 +187,17 @@ func (a ActorCounter) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, ev
 func (a ActorCounter) IsAsync() bool { return false }
 func (a ActorCounter) Name() string  { return "counter" }
 
-func (a ActorCounter) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a ActorCounter) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if cn, err := attrs.String("counter"); err != nil || cn == "" {
 		return errors.New("counter name must be non-empty string")
 	}
 
+	for _, field := range []string{"counter", "counter_step", "counter_set"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }
 

internal/actors/delay/actor.go

@@ -69,4 +69,6 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) { return nil }
+func (a actor) Validate(plugins.TemplateValidatorFunc, *plugins.FieldCollection) (err error) {
+	return nil
+}

internal/actors/delete/actor.go

@@ -46,4 +46,6 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) { return nil }
+func (a actor) Validate(plugins.TemplateValidatorFunc, *plugins.FieldCollection) (err error) {
+	return nil
+}

internal/actors/filesay/actor.go

@@ -106,10 +106,15 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return true }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) error {
-	if v, err := attrs.String("source"); err != nil || v == "" {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) error {
+	sourceTpl, err := attrs.String("source")
+	if err != nil || sourceTpl == "" {
 		return errors.New("source is expected to be non-empty string")
 	}
 
+	if err = tplValidator(sourceTpl); err != nil {
+		return errors.Wrap(err, "validating source template")
+	}
+
 	return nil
 }

internal/actors/modchannel/actor.go

@@ -16,6 +16,8 @@ const actorName = "modchannel"
 var (
 	formatMessage plugins.MsgFormatter
 	tcGetter      func(string) (*twitch.Client, error)
+
+	ptrStringEmpty = func(s string) *string { return &s }("")
 )
 
 func Register(args plugins.RegistrationArguments) error {
@@ -67,7 +69,6 @@ type actor struct{}
 
 func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData *plugins.FieldCollection, attrs *plugins.FieldCollection) (preventCooldown bool, err error) {
 	var (
-		ptrStringEmpty = func(v string) *string { return &v }("")
 		game  = attrs.MustString("game", ptrStringEmpty)
 		title = attrs.MustString("title", ptrStringEmpty)
 	)
@@ -115,10 +116,16 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("channel"); err != nil || v == "" {
 		return errors.New("channel must be non-empty string")
 	}
 
+	for _, field := range []string{"channel", "game", "title"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/actors/nuke/actor.go

@@ -28,6 +28,7 @@ var (
 	messageStoreLock sync.RWMutex
 
 	ptrStringDelete = func(v string) *string { return &v }("delete")
+	ptrStringEmpty  = func(s string) *string { return &s }("")
 	ptrString10m    = func(v string) *string { return &v }("10m")
 )
 
@@ -230,10 +231,16 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("match"); err != nil || v == "" {
 		return errors.New("match must be non-empty string")
 	}
 
+	for _, field := range []string{"scan", "action", "match"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/actors/punish/actor.go

@@ -214,7 +214,7 @@ func (a actorPunish) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eve
 func (a actorPunish) IsAsync() bool { return false }
 func (a actorPunish) Name() string  { return actorNamePunish }
 
-func (a actorPunish) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actorPunish) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("user"); err != nil || v == "" {
 		return errors.New("user must be non-empty string")
 	}
@@ -223,6 +223,10 @@ func (a actorPunish) Validate(attrs *plugins.FieldCollection) (err error) {
 		return errors.New("levels must be slice of strings with length > 0")
 	}
 
+	if err = tplValidator(attrs.MustString("user", ptrStringEmpty)); err != nil {
+		return errors.Wrap(err, "validating user template")
+	}
+
 	return nil
 }
 
@@ -247,10 +251,14 @@ func (a actorResetPunish) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule
 func (a actorResetPunish) IsAsync() bool { return false }
 func (a actorResetPunish) Name() string  { return actorNameResetPunish }
 
-func (a actorResetPunish) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actorResetPunish) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("user"); err != nil || v == "" {
 		return errors.New("user must be non-empty string")
 	}
 
+	if err = tplValidator(attrs.MustString("user", ptrStringEmpty)); err != nil {
+		return errors.Wrap(err, "validating user template")
+	}
+
 	return nil
 }

internal/actors/quotedb/actor.go

@@ -173,7 +173,7 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	action := attrs.MustString("action", ptrStringEmpty)
 
 	switch action {
@@ -194,5 +194,11 @@ func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
 		return errors.New("action must be one of add, del or get")
 	}
 
+	for _, field := range []string{"index", "quote", "format"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/actors/raw/actor.go

@@ -12,6 +12,8 @@ const actorName = "raw"
 var (
 	formatMessage plugins.MsgFormatter
 	send          plugins.SendMessageFunc
+
+	ptrStringEmpty = func(s string) *string { return &s }("")
 )
 
 func Register(args plugins.RegistrationArguments) error {
@@ -63,10 +65,14 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("message"); err != nil || v == "" {
 		return errors.New("message must be non-empty string")
 	}
 
+	if err = tplValidator(attrs.MustString("message", ptrStringEmpty)); err != nil {
+		return errors.Wrap(err, "validating message template")
+	}
+
 	return nil
 }

internal/actors/respond/actor.go

@@ -18,6 +18,7 @@ var (
 	send          plugins.SendMessageFunc
 
 	ptrBoolFalse   = func(v bool) *bool { return &v }(false)
+	ptrStringEmpty = func(s string) *string { return &s }("")
 )
 
 func Register(args plugins.RegistrationArguments) error {
@@ -121,10 +122,16 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("message"); err != nil || v == "" {
 		return errors.New("message must be non-empty string")
 	}
 
+	for _, field := range []string{"message", "fallback"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/actors/timeout/actor.go

@@ -82,11 +82,19 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.Duration("duration"); err != nil || v < time.Second {
 		return errors.New("duration must be of type duration greater or equal one second")
 	}
 
+	if v, err := attrs.String("reason"); err != nil || v == "" {
+		return errors.New("reason must be non-empty string")
+	}
+
+	if err = tplValidator(attrs.MustString("reason", ptrStringEmpty)); err != nil {
+		return errors.Wrap(err, "validating reason template")
+	}
+
 	return nil
 }
 

internal/actors/variables/actor.go

@@ -150,11 +150,17 @@ func (a ActorSetVariable) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule
 func (a ActorSetVariable) IsAsync() bool { return false }
 func (a ActorSetVariable) Name() string  { return "setvariable" }
 
-func (a ActorSetVariable) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a ActorSetVariable) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("variable"); err != nil || v == "" {
 		return errors.New("variable name must be non-empty string")
 	}
 
+	for _, field := range []string{"set", "variable"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }
 

internal/actors/whisper/actor.go

@@ -13,6 +13,8 @@ const actorName = "whisper"
 var (
 	botTwitchClient *twitch.Client
 	formatMessage   plugins.MsgFormatter
+
+	ptrStringEmpty = func(s string) *string { return &s }("")
 )
 
 func Register(args plugins.RegistrationArguments) error {
@@ -73,7 +75,7 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("to"); err != nil || v == "" {
 		return errors.New("to must be non-empty string")
 	}
@@ -82,5 +84,11 @@ func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
 		return errors.New("message must be non-empty string")
 	}
 
+	for _, field := range []string{"message", "to"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/apimodules/customevent/actor.go

@@ -13,8 +13,6 @@ import (
 type actor struct{}
 
 func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData *plugins.FieldCollection, attrs *plugins.FieldCollection) (preventCooldown bool, err error) {
-	ptrStringEmpty := func(v string) *string { return &v }("")
-
 	fd, err := formatMessage(attrs.MustString("fields", ptrStringEmpty), m, r, eventData)
 	if err != nil {
 		return false, errors.Wrap(err, "executing fields template")
@@ -51,10 +49,16 @@ func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData
 func (a actor) IsAsync() bool { return false }
 func (a actor) Name() string  { return actorName }
 
-func (a actor) Validate(attrs *plugins.FieldCollection) (err error) {
+func (a actor) Validate(tplValidator plugins.TemplateValidatorFunc, attrs *plugins.FieldCollection) (err error) {
 	if v, err := attrs.String("fields"); err != nil || v == "" {
 		return errors.New("fields is expected to be non-empty string")
 	}
 
+	for _, field := range []string{"fields", "schedule_in"} {
+		if err = tplValidator(attrs.MustString(field, ptrStringEmpty)); err != nil {
+			return errors.Wrapf(err, "validating %s template", field)
+		}
+	}
+
 	return nil
 }

internal/apimodules/customevent/customevent.go

@@ -21,6 +21,8 @@ var (
 	eventCreatorFunc plugins.EventHandlerFunc
 	formatMessage    plugins.MsgFormatter
 	mc               *memoryCache
+
+	ptrStringEmpty = func(s string) *string { return &s }("")
 )
 
 func Register(args plugins.RegistrationArguments) error {

main.go

@@ -179,6 +179,7 @@ func handleSubCommand(args []string) {
 		fmt.Println("  actor-docs                     Generate markdown documentation for available actors")
 		fmt.Println("  api-token <name> <scope...>    Generate an api-token to be entered into the config")
 		fmt.Println("  migrate-v2 <old file>          Migrate old (*.json.gz) storage file into new database")
+		fmt.Println("  validate-config                Try to load configuration file and report errors if any")
 		fmt.Println("  help                           Prints this help message")
 
 	case "migrate-v2":
@@ -197,6 +198,11 @@ func handleSubCommand(args []string) {
 
 		log.Info("v2 storage file was migrated")
 
+	case "validate-config":
+		if err := loadConfig(cfg.Config); err != nil {
+			log.WithError(err).Fatal("loading config")
+		}
+
 	default:
 		handleSubCommand([]string{"help"})
 		log.Fatalf("Unknown sub-command %q", args[0])

msgformatter.go

@@ -86,3 +86,14 @@ func formatMessageFieldUserID(compiledFields *plugins.FieldCollection, m *irc.Me
 func formatMessageFieldUsername(compiledFields *plugins.FieldCollection, m *irc.Message, fields *plugins.FieldCollection) {
 	compiledFields.Set("username", plugins.DeriveUser(m, fields))
 }
+
+func validateTemplate(tplString string) error {
+	// Template in frontend supports newlines, messages do not
+	tplString = stripNewline.ReplaceAllString(tplString, " ")
+
+	_, err := template.
+		New(tplString).
+		Funcs(tplFuncs.GetFuncMap(nil, nil, plugins.NewFieldCollection())).
+		Parse(tplString)
+	return errors.Wrap(err, "parsing template")
+}

plugins/interface.go

@@ -24,7 +24,7 @@ type (
 		// Validate will be called to validate the loaded configuration. It should
 		// return an error if required keys are missing from the AttributeStore
 		// or if keys contain broken configs
-		Validate(*FieldCollection) error
+		Validate(TemplateValidatorFunc, *FieldCollection) error
 	}
 
 	ActorCreationFunc func() Actor
@@ -105,6 +105,8 @@ type (
 	TemplateFuncGetter   func(*irc.Message, *Rule, *FieldCollection) interface{}
 	TemplateFuncRegister func(name string, fg TemplateFuncGetter)
 
+	TemplateValidatorFunc func(raw string) error
+
 	ValidateTokenFunc func(token string, modules ...string) error
 )
 

plugins/rule.go

@@ -193,6 +193,22 @@ func (r *Rule) UpdateFromSubscription() (bool, error) {
 	return true, nil
 }
 
+func (r Rule) Validate(tplValidate TemplateValidatorFunc) error {
+	if r.MatchMessage != nil {
+		if _, err := regexp.Compile(*r.MatchMessage); err != nil {
+			return errors.Wrap(err, "compiling match_message field regex")
+		}
+	}
+
+	if r.DisableOnTemplate != nil {
+		if err := tplValidate(*r.DisableOnTemplate); err != nil {
+			return errors.Wrap(err, "parsing disable_on_template template")
+		}
+	}
+
+	return nil
+}
+
 func (r *Rule) allowExecuteBadgeBlacklist(logger *log.Entry, m *irc.Message, event *string, badges twitch.BadgeCollection, evtData *FieldCollection) bool {
 	for _, b := range r.DisableOn {
 		if badges.Has(b) {