Output reasons for signatures in verbose mode

Potential fix for Issue godaddy#342

tartufo/scanner.py

@@ -384,21 +384,21 @@ def excluded_signatures(self) -> Tuple[str, ...]:
         :returns: The signatures to be excluded from scan results
         """
         if self._excluded_signatures is None:
-            signatures: Set[str] = set()
+            signatures: Set[Dict[str, str]] = []
             deprecated = False
             for signature in tuple(
                 self.global_options.exclude_signatures or []
             ) + tuple(self.config_data.get("exclude_signatures", [])):
                 if isinstance(signature, dict):
                     try:
-                        signatures.add(signature["signature"])
+                        signatures.append(signature)
                     except KeyError as exc:
                         raise types.ConfigException(
                             "Required key signature missing in exclude-signatures"
                         ) from exc
                 elif isinstance(signature, str):
                     deprecated = True
-                    signatures.add(signature)
+                    signatures.append({"signature": signature})
                 else:
                     raise types.ConfigException(
                         f"{type(signature).__name__} signature is illegal in exclude-signatures"
@@ -411,7 +411,7 @@ def excluded_signatures(self) -> Tuple[str, ...]:
                     "reason of excluding the signature'}]",
                     DeprecationWarning,
                 )
-            self._excluded_signatures = tuple(signatures)
+            self._excluded_signatures = list(signatures)
         return self._excluded_signatures
 
     def signature_is_excluded(self, blob: str, file_path: str) -> bool:
@@ -420,10 +420,11 @@ def signature_is_excluded(self, blob: str, file_path: str) -> bool:
         :param blob: The piece of data which is being scanned
         :param file_path: The path and file name for the data being scanned
         """
+        signature = [str(excluded_signature["signature"]) for excluded_signature in self.excluded_signatures]
         return (
             blob
-            in self.excluded_signatures  # Signatures themselves pop up as entropy matches
-            or util.generate_signature(blob, file_path) in self.excluded_signatures
+            in signature  # Signatures themselves pop up as entropy matches
+            or util.generate_signature(blob, file_path) in signature
         )
 
     @staticmethod

tartufo/util.py

@@ -72,7 +72,7 @@ def echo_result(
             "output_dir": str(output_dir) if output_dir else None,
             "excluded_paths": [str(path.pattern) for path in scanner.excluded_paths],
             "excluded_signatures": [
-                str(signature) for signature in scanner.excluded_signatures
+                str(signature["signature"]) for signature in scanner.excluded_signatures
             ],
             "exclude_entropy_patterns": [
                 str(pattern) for pattern in options.exclude_entropy_patterns
@@ -112,7 +112,7 @@ def echo_result(
             click.echo("\nExcluded paths:")
             click.echo("\n".join([str(path) for path in scanner.excluded_paths]))
             click.echo("\nExcluded signatures:")
-            click.echo("\n".join(scanner.excluded_signatures))
+            click.echo("\n".join([str(signature) for signature in scanner.excluded_signatures]))
             click.echo("\nExcluded entropy patterns:")
             click.echo("\n".join(str(path) for path in scanner.excluded_entropy))