S3 - Add IllegalLocationConstraint validation when creating buckets

moto/s3/exceptions.py

@@ -127,6 +127,18 @@ class InvalidRequest(S3ClientError):
         )
 
 
+class IllegalLocationConstraintException(S3ClientError):
+    code = 400
+
+    def __init__(self, *args, **kwargs):
+        super(IllegalLocationConstraintException, self).__init__(
+            "IllegalLocationConstraintException",
+            "The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.",
+            *args,
+            **kwargs
+        )
+
+
 class MalformedXML(S3ClientError):
     code = 400
 

moto/s3/responses.py

@@ -29,6 +29,7 @@ from .exceptions import (
     InvalidPartOrder,
     MalformedXML,
     MalformedACLError,
+    IllegalLocationConstraintException,
     InvalidNotificationARN,
     InvalidNotificationEvent,
     ObjectNotInActiveTierError,
@@ -585,6 +586,15 @@ class ResponseObject(_TemplateEnvironmentMixin, ActionAuthenticatorMixin):
             next_continuation_token = None
         return result_keys, is_truncated, next_continuation_token
 
+    def _body_contains_location_constraint(self, body):
+        if body:
+            try:
+                xmltodict.parse(body)["CreateBucketConfiguration"]["LocationConstraint"]
+                return True
+            except KeyError:
+                pass
+        return False
+
     def _bucket_response_put(
         self, request, body, region_name, bucket_name, querystring
     ):
@@ -680,10 +690,16 @@ class ResponseObject(_TemplateEnvironmentMixin, ActionAuthenticatorMixin):
             return ""
 
         else:
+            # us-east-1, the default AWS region behaves a bit differently
+            # - you should not use it as a location constraint --> it fails
+            # - querying the location constraint returns None
+            # - LocationConstraint has to be specified if outside us-east-1
+            if (
+                region_name != DEFAULT_REGION_NAME
+                and not self._body_contains_location_constraint(body)
+            ):
+                raise IllegalLocationConstraintException()
             if body:
-                # us-east-1, the default AWS region behaves a bit differently
-                # - you should not use it as a location constraint --> it fails
-                # - querying the location constraint returns None
                 try:
                     forced_region = xmltodict.parse(body)["CreateBucketConfiguration"][
                         "LocationConstraint"

moto/s3/utils.py

@@ -37,7 +37,7 @@ def bucket_name_from_url(url):
 
 REGION_URL_REGEX = re.compile(
     r"^https?://(s3[-\.](?P<region1>.+)\.amazonaws\.com/(.+)|"
-    r"(.+)\.s3-(?P<region2>.+)\.amazonaws\.com)/?"
+    r"(.+)\.s3[-\.](?P<region2>.+)\.amazonaws\.com)/?"
 )