s3: Support non-AWS S3 providers which do not support request checksums.

(cherry picked from commit aeed907c50)

zerver/lib/upload/s3.py

@@ -56,6 +56,9 @@ if settings.S3_SKIP_PROXY is True:  # nocoverage
 def get_bucket(bucket_name: str, authed: bool = True) -> "Bucket":
     import boto3
 
+    checksum: Literal["when_required", "when_supported"] = (
+        "when_required" if settings.S3_SKIP_CHECKSUM else "when_supported"
+    )
     return boto3.resource(
         "s3",
         aws_access_key_id=settings.S3_KEY if authed else None,
@@ -65,6 +68,7 @@ def get_bucket(bucket_name: str, authed: bool = True) -> "Bucket":
         config=Config(
             signature_version=None if authed else botocore.UNSIGNED,
             s3={"addressing_style": settings.S3_ADDRESSING_STYLE},
+            request_checksum_calculation=checksum,
         ),
     ).Bucket(bucket_name)
 

zerver/management/commands/runtusd.py

@@ -77,4 +77,6 @@ class Command(BaseCommand):
                 env_vars["AWS_REGION"] = boto3.client("s3").meta.region_name
             else:
                 env_vars["AWS_REGION"] = settings.S3_REGION
+            if settings.S3_SKIP_CHECKSUM:
+                env_vars["AWS_REQUEST_CHECKSUM_CALCULATION"] = "when_required"
         os.execvpe("tusd", tusd_args, env_vars)