[lint] ldsig.py

app/ldsig.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
+"""Ld+json signature."""
 import base64
 import hashlib
-import typing
 from datetime import datetime
 
 import pyld  # type: ignore
@@ -17,10 +17,12 @@ from app.actor import get_public_key
 
 
 
-requests_loader = pyld.documentloader.requests.requests_document_loader()
+requests_loader = pyld.documentloader.requests.requests_document_loader() # type: ignore
 
+def _loader(url, options):
+    if options is None:
+        options = {}
 
-def _loader(url, options={}):
     # See https://github.com/digitalbazaar/pyld/issues/133
     options["headers"]["Accept"] = "application/ld+json"
 
@@ -44,9 +46,9 @@ def _options_hash(doc: ap.RawObject) -> str:
     normalized = jsonld.normalize(
         doc, {"algorithm": "URDNA2015", "format": "application/nquads"}
     )
-    h = hashlib.new("sha256")
-    h.update(normalized.encode("utf-8"))
-    return h.hexdigest()
+    doc_hash = hashlib.new("sha256")
+    doc_hash.update(normalized.encode("utf-8")) # type: ignore
+    return doc_hash.hexdigest()
 
 
 def _doc_hash(doc: ap.RawObject) -> str:
@@ -56,15 +58,16 @@ def _doc_hash(doc: ap.RawObject) -> str:
     normalized = jsonld.normalize(
         doc, {"algorithm": "URDNA2015", "format": "application/nquads"}
     )
-    h = hashlib.new("sha256")
-    h.update(normalized.encode("utf-8"))
-    return h.hexdigest()
+    doc_hash = hashlib.new("sha256")
+    doc_hash.update(normalized.encode("utf-8")) # type: ignore
+    return doc_hash.hexdigest()
 
 
 async def verify_signature(
     db_session: AsyncSession,
     doc: ap.RawObject,
 ) -> bool:
+    """Verify doc ld signature."""
     if "signature" not in doc:
         logger.warning("The object does contain a signature")
         return False
@@ -77,10 +80,11 @@ async def verify_signature(
     signer = PKCS1_v1_5.new(pubkey)
     digest = SHA256.new()
     digest.update(to_be_signed.encode("utf-8"))
-    return signer.verify(digest, base64.b64decode(signature))  # type: ignore
+    return signer.verify(digest, base64.b64decode(signature)) # pylint: disable=not-callable
 
 
 def generate_signature(doc: ap.RawObject, key) -> None:
+    """Generate doc ld signature."""
     options = {
         "type": "RsaSignature2017",
         "creator": doc["actor"] + "#main-key",