s3: Add a setting for S3 addressing style.

This controls if boto3 attempts to use
`https://bucketname.endpointname/` or `https://endpointname/bucket/`
as its prefix.  See
https://botocore.amazonaws.com/v1/documentation/api/latest/reference/config.html

Fixes: #28424.

zerver/lib/upload/s3.py

@@ -65,6 +65,7 @@ def get_bucket(bucket_name: str, authed: bool = True) -> Bucket:
         endpoint_url=settings.S3_ENDPOINT_URL,
         config=Config(
             signature_version=None if authed else botocore.UNSIGNED,
+            s3={"addressing_style": settings.S3_ADDRESSING_STYLE},
         ),
     ).Bucket(bucket_name)
 

zproject/default_settings.py

@@ -148,6 +148,7 @@ S3_AVATAR_BUCKET = ""
 S3_AUTH_UPLOADS_BUCKET = ""
 S3_REGION: Optional[str] = None
 S3_ENDPOINT_URL: Optional[str] = None
+S3_ADDRESSING_STYLE: Literal["auto", "virtual", "path"] = "auto"
 S3_SKIP_PROXY = True
 S3_UPLOADS_STORAGE_CLASS: Literal[
     "GLACIER_IR",

zproject/prod_settings_template.py

@@ -788,6 +788,7 @@ LOCAL_UPLOADS_DIR = "/home/zulip/uploads"
 # S3_AVATAR_BUCKET = ""
 # S3_REGION = None
 # S3_ENDPOINT_URL = None
+# S3_ADDRESSING_STYLE = "auto"
 # S3_SKIP_PROXY = True
 # S3_UPLOADS_STORAGE_CLASS = "STANDARD"