Add debug messages for attribute check failures (#25)

Signed-off-by: Aditya Sirish <[email protected]>

verifier/models.go

@@ -23,6 +23,7 @@ type Constraint struct {
 	Rule           string `yaml:"rule"`
 	AllowIfNoClaim bool   `yaml:"allowIfNoClaim"`
 	Warn           bool   `yaml:"warn"`
+	Debug          string `yaml:"debug"`
 }
 
 type ExpectedStepPredicates struct {

verifier/rules.go

@@ -142,10 +142,18 @@ func applyAttributeRules(env *cel.Env, input interpreter.Activation, rules []Con
 		switch result := out.Value().(type) {
 		case bool:
 			if !result {
+				var message string
+				if r.Debug == "" {
+					message = fmt.Sprintf("verification failed for rule '%s'", r.Rule)
+				} else {
+					message = fmt.Sprintf("%s\nin rule '%s'", r.Debug, r.Rule)
+				}
+
 				if !r.Warn {
-					return fmt.Errorf("verification failed for rule '%s'", r.Rule)
+					return fmt.Errorf(message)
 				}
-				log.Warnf("Rule %s failed.", r.Rule)
+
+				log.Warnf("%s", message)
 			}
 		case error:
 			log.Info(result)

verifier/verifier.go

@@ -266,6 +266,7 @@ func substituteParameters(layout *Layout, parameters map[string]string) (*Layout
 					Rule:           replace(replacer, attributeRule.Rule),
 					AllowIfNoClaim: attributeRule.AllowIfNoClaim,
 					Warn:           attributeRule.Warn,
+					Debug:          replace(replacer, attributeRule.Debug),
 				}
 			}
 		}