1 files changed, 45 insertions, 0 deletions
diff --git a/gitlint-core/gitlint/contrib/rules/authors_commit.py b/gitlint-core/gitlint/contrib/rules/authors_commit.py
new file mode 100644
index 0000000..5c4a150
--- /dev/null
+++ b/gitlint-core/gitlint/contrib/rules/authors_commit.py
@@ -0,0 +1,45 @@
+import re
+from pathlib import Path
+from typing import Tuple
+
+from gitlint.rules import CommitRule, RuleViolation
+
+
+class AllowedAuthors(CommitRule):
+    """Enforce that only authors listed in the AUTHORS file are allowed to commit."""
+
+    authors_file_names = ("AUTHORS", "AUTHORS.txt", "AUTHORS.md")
+    parse_authors = re.compile(r"^(?P<name>.*) <(?P<email>.*)>$", re.MULTILINE)
+
+    name = "contrib-allowed-authors"
+
+    id = "CC3"
+
+    @classmethod
+    def _read_authors_from_file(cls, git_ctx) -> Tuple[str, str]:
+        for file_name in cls.authors_file_names:
+            path = Path(git_ctx.repository_path) / file_name
+            if path.exists():
+                authors_file = path
+                break
+        else:
+            raise FileNotFoundError("No AUTHORS file found!")
+
+        authors_file_content = authors_file.read_text("utf-8")
+        authors = re.findall(cls.parse_authors, authors_file_content)
+
+        return set(authors), authors_file.name
+
+    def validate(self, commit):
+        registered_authors, authors_file_name = AllowedAuthors._read_authors_from_file(commit.message.context)
+
+        author = (commit.author_name, commit.author_email.lower())
+
+        if author not in registered_authors:
+            return [
+                RuleViolation(
+                    self.id,
+                    f"Author not in '{authors_file_name}' file: " f'"{commit.author_name} <{commit.author_email}>"',
+                )
+            ]
+        return []