issue_comments: 1061267615

Built a prototype of that plugin: ```python from datasette import hookimpl from functools import wraps

@hookimpl def asgi_wrapper(datasette): def wrap_with_hashed_urls(app): @wraps(app) async def hashed_urls(scope, receive, send): # Only triggers on pages with a path not starting in /-/ # and where the first page component matches a database name if scope.get("type") != "http": await app(scope, receive, send) return path = scope["path"].lstrip("/") if not path or path.startswith("-/"): await app(scope, receive, send) return potential_database = path.split("/")[0] # It may or may not be already dbname~hash if "~" in potential_database: db_name, hash = potential_database.split("~", 1) else: db_name = potential_database hash = "" # Is db_name a database we have a hash for? try: db = datasette.get_database(db_name) except KeyError: await app(scope, receive, send) return

        if db.hash is not None:
            # TODO: make sure db.hash is documented
            if db.hash[:7] != hash:
                # Send a redirect
                path_bits = path.split("/")
                new_path = "/" + "/".join(["{}-{}".format(db_name, db.hash[:7])] + path_bits[1:])
                if scope.get("query_string"):
                    new_path += "?" + scope["query_string"].decode("latin-1")

                await send({
                    "type": "http.response.start",
                    "status": 302,
                    "headers": [
                        [b"location", new_path.encode("latin1")]
                    ],
                })
                await send({"type": "http.response.body", "body": b""})
                return
            else:
                # Add a far-future cache header
                async def wrapped_send(event):
                    if event["type"] == "http.response.start":
                        original_headers = event.get("headers") or []
                        event = {
                            "type": event["type"],
                            "status": event["status"],
                            "headers": original_headers + [
                                [b"Cache-Control", b"max-age=31536000"]
                            ],
                        }
                    await send(event)

                await app(scope, receive, wrapped_send)
                return

        await app(scope, receive, send)
    return hashed_urls
return wrap_with_hashed_urls

``` One catch: it doesn't affect the way URLs are generated - so every internal link within Datasette links to the non-hash version and then triggers a 302 redirect to the hashed version.