Validate configuration source keys and overrides

internal/config/config.go

@@ -21,6 +21,33 @@ const (
 	NotifyFailureError NotifyFailurePolicy = "error"
 )
 
+const (
+	MissingSourceObservations          = "observations"
+	MissingSourceCurrent               = "current"
+	MissingSourceNarrative             = "narrative"
+	MissingSourceAlerts                = "alerts"
+	MissingSourceDiscussion            = "discussion"
+	MissingSourceWeatherStory          = "weather_story"
+	MissingSourceSPCConvectiveOutlooks = "spc_convective_outlooks"
+)
+
+var supportedMissingSources = map[string]struct{}{
+	MissingSourceObservations:          {},
+	MissingSourceCurrent:               {},
+	MissingSourceNarrative:             {},
+	MissingSourceAlerts:                {},
+	MissingSourceDiscussion:            {},
+	MissingSourceWeatherStory:          {},
+	MissingSourceSPCConvectiveOutlooks: {},
+}
+
+// IsSupportedMissingSource reports whether source accepts a missing-source
+// policy override. Required sources, including hourly, are not configurable.
+func IsSupportedMissingSource(source string) bool {
+	_, ok := supportedMissingSources[source]
+	return ok
+}
+
 type Config struct {
 	WeatherAPI    WeatherAPIConfig        `yaml:"weather_api"`
 	Location      LocationConfig          `yaml:"location"`
@@ -246,7 +273,11 @@ func (c *ReportDistributorConfig) UnmarshalYAML(value *yaml.Node) error {
 }
 
 func (c ReportDistributorConfig) PathTemplatesSet() bool {
-	return c.pathTemplatesSet
+	return c.pathTemplatesSet || c.PathTemplates != nil
+}
+
+func (c ReportConfig) deterministicModulesConfigured() bool {
+	return c.deterministicModulesSet || c.DeterministicModules != nil
 }
 
 func (m *ModuleConfigItem) UnmarshalYAML(value *yaml.Node) error {