From 617c35398a6e8017babd70d0d94150ebab2a4596 Mon Sep 17 00:00:00 2001 From: Alex Vandiver Date: Wed, 3 Jan 2024 20:26:23 +0000 Subject: [PATCH] s3: Only use get_bucket to get to boto3 clients and resources. boto3 has two different modalities of making API calls -- through resources, and through clients. Resources are a higher-level abstraction, and thus more generally useful, but some APIs are only accessible through clients. It is possible to get to a client object from a resource, but not vice versa. Use `get_bucket(...).meta.client` when we need direct access to the client object for more complex API calls; this lets all of the configuration for how to access S3 to sit within `get_bucket`. Client objects are not bound to only one bucket, but we get to them based on the bucket we will be interacting with, for clarity. We removed the cached session object, as it serves no real purpose. --- zerver/lib/upload/s3.py | 46 ++++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 26 deletions(-) diff --git a/zerver/lib/upload/s3.py b/zerver/lib/upload/s3.py index fe2b03737b..7b4099057f 100644 --- a/zerver/lib/upload/s3.py +++ b/zerver/lib/upload/s3.py @@ -8,9 +8,9 @@ from urllib.parse import urljoin, urlsplit, urlunsplit import boto3 import botocore -from boto3.session import Session from botocore.client import Config from django.conf import settings +from mypy_boto3_s3 import S3Client from mypy_boto3_s3.service_resource import Bucket, Object from typing_extensions import override @@ -56,13 +56,17 @@ if settings.S3_SKIP_PROXY is True: # nocoverage botocore.utils.should_bypass_proxies = lambda url: True -def get_bucket(bucket_name: str, session: Optional[Session] = None) -> Bucket: - if session is None: - session = Session(settings.S3_KEY, settings.S3_SECRET_KEY) - bucket = session.resource( - "s3", region_name=settings.S3_REGION, endpoint_url=settings.S3_ENDPOINT_URL +def get_bucket(bucket_name: str, authed: bool = True) -> Bucket: + return boto3.resource( + "s3", + aws_access_key_id=settings.S3_KEY if authed else None, + aws_secret_access_key=settings.S3_SECRET_KEY if authed else None, + region_name=settings.S3_REGION, + endpoint_url=settings.S3_ENDPOINT_URL, + config=Config( + signature_version=None if authed else botocore.UNSIGNED, + ), ).Bucket(bucket_name) - return bucket def upload_image_to_s3( @@ -102,13 +106,7 @@ def upload_image_to_s3( def get_signed_upload_url(path: str, force_download: bool = False) -> str: - client = boto3.client( - "s3", - aws_access_key_id=settings.S3_KEY, - aws_secret_access_key=settings.S3_SECRET_KEY, - region_name=settings.S3_REGION, - endpoint_url=settings.S3_ENDPOINT_URL, - ) + client: S3Client = get_bucket(settings.S3_AUTH_UPLOADS_BUCKET).meta.client # type: ignore[assignment] # https://github.com/youtype/mypy_boto3_builder/issues/239 params = { "Bucket": settings.S3_AUTH_UPLOADS_BUCKET, "Key": path, @@ -126,9 +124,8 @@ def get_signed_upload_url(path: str, force_download: bool = False) -> str: class S3UploadBackend(ZulipUploadBackend): def __init__(self) -> None: - self.session = Session(settings.S3_KEY, settings.S3_SECRET_KEY) - self.avatar_bucket = get_bucket(settings.S3_AVATAR_BUCKET, self.session) - self.uploads_bucket = get_bucket(settings.S3_AUTH_UPLOADS_BUCKET, self.session) + self.avatar_bucket = get_bucket(settings.S3_AVATAR_BUCKET) + self.uploads_bucket = get_bucket(settings.S3_AUTH_UPLOADS_BUCKET) self.public_upload_url_base = self.construct_public_upload_url_base() def delete_file_from_s3(self, path_id: str, bucket: Bucket) -> bool: @@ -162,12 +159,11 @@ class S3UploadBackend(ZulipUploadBackend): # we instead back-compute the URL pattern here. DUMMY_KEY = "dummy_key_ignored" - client = self.session.client( - "s3", - region_name=settings.S3_REGION, - endpoint_url=settings.S3_ENDPOINT_URL, - config=Config(signature_version=botocore.UNSIGNED), - ) + + # We do not access self.avatar_bucket.meta.client directly, + # since that client is auth'd, and we want only the direct + # unauthed endpoint here. + client: S3Client = get_bucket(self.avatar_bucket.name, authed=False).meta.client # type: ignore[assignment] # https://github.com/youtype/mypy_boto3_builder/issues/239 dummy_signed_url = client.generate_presigned_url( ClientMethod="get_object", Params={ @@ -250,9 +246,7 @@ class S3UploadBackend(ZulipUploadBackend): @override def all_message_attachments(self) -> Iterator[Tuple[str, datetime]]: - client = self.session.client( - "s3", region_name=settings.S3_REGION, endpoint_url=settings.S3_ENDPOINT_URL - ) + client = self.uploads_bucket.meta.client paginator = client.get_paginator("list_objects_v2") page_iterator = paginator.paginate(Bucket=self.uploads_bucket.name)