Storm prepare by chunk

As of issue #76, PR #77 and to accomodate issue #64, thus case of "many small" or "really big" files, chunk big files in many blocks and blocks request also in chunks if more than 100 blocks need for the transfer of all files

transferwee.py

@@ -376,27 +376,39 @@ def _storm_prepare(authorization: str, filenames: List[str]) -> Dict[Any, Any]:
     Return the parsed JSON response.
     """
     files_bids = [_storm_prepare_item(f) for f in filenames]
-    j = {
-        "blocks": [i for sublist in files_bids for i in sublist],
-    }
-    requests.options(
-        _storm_urls(authorization)["WETRANSFER_STORM_BLOCK"],
-        headers={
-            "Origin": "https://wetransfer.com",
-            "Access-Control-Request-Method": "POST",
-            "User-Agent": WETRANSFER_USER_AGENT,
-        },
-    )
-    r = requests.post(
-        _storm_urls(authorization)["WETRANSFER_STORM_BLOCK"],
-        json=j,
-        headers={
-            "Authorization": f"Bearer {authorization}",
-            "Origin": "https://wetransfer.com",
-            "User-Agent": WETRANSFER_USER_AGENT,
-        },
-    )
-    return {"files_bids": files_bids, "blocks": r.json()}
+
+    blocks = [i for sublist in files_bids for i in sublist]
+    response = {"ok": True, "data": {"blocks": []}}
+    chunk_size = 100
+    for i in range(0, len(blocks), chunk_size):
+        j = {
+            "blocks": blocks[i : i + chunk_size],
+        }
+        requests.options(
+            _storm_urls(authorization)["WETRANSFER_STORM_BLOCK"],
+            headers={
+                "Origin": "https://wetransfer.com",
+                "Access-Control-Request-Method": "POST",
+                "User-Agent": WETRANSFER_USER_AGENT,
+            },
+        )
+        r = requests.post(
+            _storm_urls(authorization)["WETRANSFER_STORM_BLOCK"],
+            json=j,
+            headers={
+                "Authorization": f"Bearer {authorization}",
+                "Origin": "https://wetransfer.com",
+                "User-Agent": WETRANSFER_USER_AGENT,
+            },
+        )
+
+        r_json = r.json()
+        if not r_json["ok"]:
+            logger.error(r_json)
+        response["ok"] = response["ok"] and r_json["ok"]
+        response["data"]["blocks"] += r_json["data"]["blocks"]
+
+    return {"files_bids": files_bids, "blocks": response}
 
 
 def _storm_finalize_item(