added padding

db.py

@@ -4,6 +4,8 @@ from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
 from sqlalchemy import select
 
+PADDING = 5
+
 engine = create_engine("sqlite:///example.db")
 session = Session(bind=engine)
 
@@ -22,19 +24,19 @@ class File(Base):
     def __repr__(self):
         return f"<File(id={self.id}, extension='{self.extension}', hash='{self.hash}')>"
 
-def to_base36(n: int) -> str:
+def to_base36(n: int, width: int) -> str:
     if n < 0:
         raise ValueError("Only non-negative integers supported")
 
     chars = "0123456789abcdefghijklmnopqrstuvwxyz"
     if n == 0:
-        return "0"
+        return "0".rjust(width, "0")
 
     result = []
     while n > 0:
         n, rem = divmod(n, 36)
         result.append(chars[rem])
-    return "".join(reversed(result))
+    return "".join(reversed(result)).rjust(width, "0")
 
 Base.metadata.create_all(bind=engine)
 
@@ -55,7 +57,7 @@ def file_exists(size: int, hash_value: str) -> bool:
         if existed_file is None:
             return None
 
-        url = f"{to_base36(existed_file.id)}"
+        url = f"{to_base36(existed_file.id, PADDING)}"
         if existed_file.extension:
             url += f".{existed_file.extension}"
 
@@ -75,7 +77,7 @@ def add_file(filename: str, content_type, size: int, hash):
         new_file.hash = hash 
         db.add(new_file)
         db.commit()
-        url = f"{to_base36(new_file.id)}"
+        url = f"{to_base36(new_file.id, PADDING)}"
         if new_file.extension:
             url += f".{new_file.extension}"