fix private key line number (#231)

Author: omryMen

detect_secrets/plugins/private_key.py

@@ -97,12 +97,24 @@ def analyze_line(
                 self._analyzed_files.add(filename)
             file_content = self.read_file(filename)
             if file_content:
-                output.update(
-                    super().analyze_line(
-                        filename=filename, line=file_content, line_number=1,
-                        context=context, raw_context=raw_context, **kwargs,
-                    ),
+                found_secrets = super().analyze_line(
+                    filename=filename, line=file_content, line_number=1,
+                    context=context, raw_context=raw_context, **kwargs,
                 )
+                updated_secrets = set()
+                for sec in found_secrets:
+                    secret_val = sec.secret_value or ''
+                    line_number = self.find_line_number(file_content, secret_val)
+                    updated_secrets.add(
+                        PotentialSecret(
+                            type=self.secret_type,
+                            filename=sec.filename,
+                            secret=secret_val,
+                            line_number=line_number,
+                            is_verified=sec.is_verified,
+                        ),
+                    )
+                output.update(updated_secrets)
         return output
 
     def analyze_string(self, string: str) -> Generator[str, None, None]:
@@ -129,3 +141,15 @@ def get_file_size(self, file_path: str) -> int:
             return os.path.getsize(file_path)
         except Exception:
             return -1
+
+    def find_line_number(
+            self, file_content: str, substring: str, default_line_number: int = 1,
+    ) -> int:
+        if len(substring) == 0:
+            return default_line_number
+        lines = file_content.splitlines()
+
+        for line_number, line in enumerate(lines, start=1):
+            if substring in line:
+                return line_number
+        return default_line_number