Update monaihosting download method (#8364)

Related to Project-MONAI/model-zoo#723.

### Description

Currently, bundle download on source "monaihosting" uses fixed download
url according to the function `_get_monaihosting_bundle_url`.
A possible enhancement if to support on bundles that are hosted in
different places.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Yiheng Wang <vennw@nvidia.com>
Co-authored-by: YunLiu <55491388+KumoLiu@users.noreply.github.com>

Author: yiheng-wang-nv

monai/bundle/scripts.py

@@ -15,6 +15,7 @@
 import json
 import os
 import re
+import urllib
 import warnings
 import zipfile
 from collections.abc import Mapping, Sequence
@@ -58,7 +59,7 @@
 validate, _ = optional_import("jsonschema", name="validate")
 ValidationError, _ = optional_import("jsonschema.exceptions", name="ValidationError")
 Checkpoint, has_ignite = optional_import("ignite.handlers", IgniteInfo.OPT_IMPORT_VERSION, min_version, "Checkpoint")
-requests_get, has_requests = optional_import("requests", name="get")
+requests, has_requests = optional_import("requests")
 onnx, _ = optional_import("onnx")
 huggingface_hub, _ = optional_import("huggingface_hub")
 
@@ -206,6 +207,16 @@ def _download_from_monaihosting(download_path: Path, filename: str, version: str
     extractall(filepath=filepath, output_dir=download_path, has_base=True)
 
 
+def _download_from_bundle_info(download_path: Path, filename: str, version: str, progress: bool) -> None:
+    bundle_info = get_bundle_info(bundle_name=filename, version=version)
+    if not bundle_info:
+        raise ValueError(f"Bundle info not found for {filename} v{version}.")
+    url = bundle_info["browser_download_url"]
+    filepath = download_path / f"{filename}_v{version}.zip"
+    download_url(url=url, filepath=filepath, hash_val=None, progress=progress)
+    extractall(filepath=filepath, output_dir=download_path, has_base=True)
+
+
 def _add_ngc_prefix(name: str, prefix: str = "monai_") -> str:
     if name.startswith(prefix):
         return name
@@ -222,7 +233,7 @@ def _get_all_download_files(request_url: str, headers: dict | None = None) -> li
     if not has_requests:
         raise ValueError("requests package is required, please install it.")
     headers = {} if headers is None else headers
-    response = requests_get(request_url, headers=headers)
+    response = requests.get(request_url, headers=headers)
     response.raise_for_status()
     model_info = json.loads(response.text)
 
@@ -266,7 +277,7 @@ def _download_from_ngc_private(
     request_url = _get_ngc_private_bundle_url(model_name=filename, version=version, repo=repo)
     if has_requests:
         headers = {} if headers is None else headers
-        response = requests_get(request_url, headers=headers)
+        response = requests.get(request_url, headers=headers)
         response.raise_for_status()
     else:
         raise ValueError("NGC API requires requests package. Please install it.")
@@ -289,7 +300,7 @@ def _get_ngc_token(api_key, retry=0):
     url = "https://authn.nvidia.com/token?service=ngc"
     headers = {"Accept": "application/json", "Authorization": "ApiKey " + api_key}
     if has_requests:
-        response = requests_get(url, headers=headers)
+        response = requests.get(url, headers=headers)
         if not response.ok:
             # retry 3 times, if failed, raise an error.
             if retry < 3:
@@ -303,14 +314,17 @@ def _get_ngc_token(api_key, retry=0):
 
 def _get_latest_bundle_version_monaihosting(name):
     full_url = f"{MONAI_HOSTING_BASE_URL}/{name.lower()}"
-    requests_get, has_requests = optional_import("requests", name="get")
     if has_requests:
-        resp = requests_get(full_url)
-        resp.raise_for_status()
-    else:
-        raise ValueError("NGC API requires requests package. Please install it.")
-    model_info = json.loads(resp.text)
-    return model_info["model"]["latestVersionIdStr"]
+        resp = requests.get(full_url)
+        try:
+            resp.raise_for_status()
+            model_info = json.loads(resp.text)
+            return model_info["model"]["latestVersionIdStr"]
+        except requests.exceptions.HTTPError:
+            # for monaihosting bundles, if cannot find the version, get from model zoo model_info.json
+            return get_bundle_versions(name)["latest_version"]
+
+    raise ValueError("NGC API requires requests package. Please install it.")
 
 
 def _examine_monai_version(monai_version: str) -> tuple[bool, str]:
@@ -388,14 +402,14 @@ def _get_latest_bundle_version_ngc(name: str, repo: str | None = None, headers:
     version_header = {"Accept-Encoding": "gzip, deflate"}  # Excluding 'zstd' to fit NGC requirements
     if headers:
         version_header.update(headers)
-    resp = requests_get(version_endpoint, headers=version_header)
+    resp = requests.get(version_endpoint, headers=version_header)
     resp.raise_for_status()
     model_info = json.loads(resp.text)
     latest_versions = _list_latest_versions(model_info)
 
     for version in latest_versions:
         file_endpoint = base_url + f"/{name.lower()}/versions/{version}/files/configs/metadata.json"
-        resp = requests_get(file_endpoint, headers=headers)
+        resp = requests.get(file_endpoint, headers=headers)
         metadata = json.loads(resp.text)
         resp.raise_for_status()
         # if the package version is not available or the model is compatible with the package version
@@ -585,7 +599,16 @@ def download(
             name_ver = "_v".join([name_, version_]) if version_ is not None else name_
             _download_from_github(repo=repo_, download_path=bundle_dir_, filename=name_ver, progress=progress_)
         elif source_ == "monaihosting":
-            _download_from_monaihosting(download_path=bundle_dir_, filename=name_, version=version_, progress=progress_)
+            try:
+                _download_from_monaihosting(
+                    download_path=bundle_dir_, filename=name_, version=version_, progress=progress_
+                )
+            except urllib.error.HTTPError:
+                # for monaihosting bundles, if cannot download from default host, download according to bundle_info
+                _download_from_bundle_info(
+                    download_path=bundle_dir_, filename=name_, version=version_, progress=progress_
+                )
+
         elif source_ == "ngc":
             _download_from_ngc(
                 download_path=bundle_dir_,
@@ -792,9 +815,9 @@ def _get_all_bundles_info(
 
         if auth_token is not None:
             headers = {"Authorization": f"Bearer {auth_token}"}
-            resp = requests_get(request_url, headers=headers)
+            resp = requests.get(request_url, headers=headers)
         else:
-            resp = requests_get(request_url)
+            resp = requests.get(request_url)
         resp.raise_for_status()
     else:
         raise ValueError("requests package is required, please install it.")