Add support for 'file' URI scheme to URL-based connectors (#2873)

Add support for the 'file' URI scheme to the URL component catalog connector, the Apache Airflow package connector, and Apache Airflow provider package connector. This enables those connectors to load resources from the local file system, which can lead to significant performance improvements in the Visual Pipeline Editor.

docs/source/user_guide/pipeline-components.md

@@ -59,7 +59,7 @@ Elyra includes connectors for the following component catalog types:
 
    Example: A directory component catalog that is configured using the `/users/jdoe/kubeflow_components/test` path makes all component files in that directory available to Elyra.
 
- - [_URL component catalogs_](#url-component-catalog) provide access to components that are stored on the web and can be retrieved using anonymous HTTP `GET` requests.
+ - [_URL component catalogs_](#url-component-catalog) provide access to components that are stored on the web and can be retrieved using HTTP `GET` requests.
 
     Example: A URL component catalog that is configured using the `http://myserver:myport/mypath/my_component.yaml` URL makes the `my_component.yaml` component file available to Elyra.
 
@@ -395,36 +395,62 @@ Examples (CLI):
 
 The URL component catalog connector provides access to components that are stored on the web:
 - You can specify one or more URL resources.
-- The specified URLs must be retrievable using an HTTP `GET` request.
+- The specified URLs must be retrievable using an HTTP `GET` request. `http`, `https`, and `file` [URI schemes](https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml) are supported.
 - If the resources are secured, provide credentials, such as a user id and password or API key.
 
 Examples (GUI):
- - `https://raw.githubusercontent.com/elyra-ai/examples/main/component-catalog-connectors/kfp-example-components-connector/kfp_examples_connector/resources/filter_text_using_shell_and_grep.yaml`
+ - HTTPS URL
+   ```
+   https://raw.githubusercontent.com/elyra-ai/examples/main/component-catalog-connectors/kfp-example-components-connector/kfp_examples_connector/resources/filter_text_using_shell_and_grep.yaml
+   ```
+ - Local file URL
+   ```
+   file:///absolute/path/to/component.yaml
+   ```
 
 Examples (CLI):
- - `['https://raw.githubusercontent.com/elyra-ai/examples/main/component-catalog-connectors/kfp-example-components-connector/kfp_examples_connector/resources/filter_text_using_shell_and_grep.yaml']`
- - `['<URL_1>','<URL_2>']`
+ - HTTPS URL
+   ```
+   ['https://raw.githubusercontent.com/elyra-ai/examples/main/component-catalog-connectors/kfp-example-components-connector/kfp_examples_connector/resources/filter_text_using_shell_and_grep.yaml']
+   ```
+ - Local file URL
+   ```
+   ['file:///absolute/path/to/component.yaml']
+   ```
+ - Multiple URLs
+   ```
+   ['<URL_1>','<URL_2>']
+   ```
 
 
 #### Apache Airflow package catalog
 
 The [Apache Airflow package catalog connector](https://github.com/elyra-ai/elyra/tree/main/elyra/pipeline/airflow/package_catalog_connector) provides access to operators that are stored in Apache Airflow [built distributions](https://packaging.python.org/en/latest/glossary/#term-built-distribution):
 - Only the [wheel distribution format](https://packaging.python.org/en/latest/glossary/#term-Wheel) is supported.
-- The specified URL must be retrievable using an HTTP `GET` request.
+- The specified URL must be retrievable using an HTTP `GET` request. `http`, `https`, and `file` [URI schemes](https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml) are supported.
 
 Examples:
  - [Apache Airflow](https://pypi.org/project/apache-airflow/) (v1.10.15): 
    ```
    https://files.pythonhosted.org/packages/f0/3a/f5ce74b2bdbbe59c925bb3398ec0781b66a64b8a23e2f6adc7ab9f1005d9/apache_airflow-1.10.15-py2.py3-none-any.whl
+   ```
+ - Local copy of a downloaded Apache Airflow package
+   ```
+   file:///absolute/path/to/apache_airflow-1.10.15-py2.py3-none-any.whl
    ``` 
 
 #### Apache Airflow provider package catalog
 The [Apache Airflow provider package catalog connector](https://github.com/elyra-ai/elyra/tree/main/elyra/pipeline/airflow/provider_package_catalog_connector) provides access to operators that are stored in [Apache Airflow provider packages](https://airflow.apache.org/docs/apache-airflow-providers/):
 - Only the [wheel distribution format](https://packaging.python.org/en/latest/glossary/#term-Wheel) is supported.
-- The specified URL must be retrievable using an HTTP `GET` request.
+- The specified URL must be retrievable using an HTTP `GET` request. `http`, `https`, and `file` [URI schemes](https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml) are supported.
 
 Examples:
  - [apache-airflow-providers-http](https://airflow.apache.org/docs/apache-airflow-providers-http/stable/index.html) (v2.0.2): 
    ```
    https://files.pythonhosted.org/packages/a1/08/91653e9f394cbefe356ac07db809be7e69cc89b094379ad91d6cef3d2bc9/apache_airflow_providers_http-2.0.2-py3-none-any.whl
    ```
+
+ - Local copy of a downloaded provider package
+   ```
+   file:///absolute/path/to/apache_airflow_providers_http-2.0.2-py3-none-any.whl
+   ```

elyra/pipeline/airflow/package_catalog_connector/airflow_package_catalog_connector.py

@@ -26,12 +26,13 @@
 from urllib.parse import urlparse
 import zipfile
 
-from requests import get
+from requests import session
 from requests.auth import HTTPBasicAuth
 
 from elyra.pipeline.catalog_connector import AirflowEntryData
 from elyra.pipeline.catalog_connector import ComponentCatalogConnector
 from elyra.pipeline.catalog_connector import EntryData
+from elyra.util.url import FileTransportAdapter
 
 
 class AirflowPackageCatalogConnector(ComponentCatalogConnector):
@@ -74,20 +75,22 @@ def get_catalog_entries(self, catalog_metadata: Dict[str, Any]) -> List[Dict[str
             )
             return operator_key_list
 
-        # determine whether authentication needs to be performed
-        auth_id = catalog_metadata.get("auth_id")
-        auth_password = catalog_metadata.get("auth_password")
-        if auth_id and auth_password:
-            auth = HTTPBasicAuth(auth_id, auth_password)
-        elif auth_id or auth_password:
-            self.log.error(
-                f"Error. Airflow connector '{catalog_metadata.get('display_name')}' "
-                "is not configured properly. "
-                "Authentication requires a user id and password or API key."
-            )
-            return operator_key_list
-        else:
-            auth = None
+        pr = urlparse(airflow_package_download_url)
+        auth = None
+
+        if pr.scheme != "file":
+            # determine whether authentication needs to be performed
+            auth_id = catalog_metadata.get("auth_id")
+            auth_password = catalog_metadata.get("auth_password")
+            if auth_id and auth_password:
+                auth = HTTPBasicAuth(auth_id, auth_password)
+            elif auth_id or auth_password:
+                self.log.error(
+                    f"Error. Airflow connector '{catalog_metadata.get('display_name')}' "
+                    "is not configured properly. "
+                    "Authentication requires a user id and password or API key."
+                )
+                return operator_key_list
 
         # tmp_archive_dir is used to store the downloaded archive and as working directory
         if hasattr(self, "tmp_archive_dir"):
@@ -100,7 +103,10 @@ def get_catalog_entries(self, catalog_metadata: Dict[str, Any]) -> List[Dict[str
 
             # download archive; abort after 30 seconds
             try:
-                response = get(
+                requests_session = session()
+                if pr.scheme == "file":
+                    requests_session.mount("file://", FileTransportAdapter())
+                response = requests_session.get(
                     airflow_package_download_url,
                     timeout=AirflowPackageCatalogConnector.REQUEST_TIMEOUT,
                     allow_redirects=True,

elyra/pipeline/airflow/provider_package_catalog_connector/airflow_provider_package_catalog_connector.py

@@ -28,12 +28,13 @@
 from urllib.parse import urlparse
 import zipfile
 
-from requests import get
+from requests import session
 from requests.auth import HTTPBasicAuth
 
 from elyra.pipeline.catalog_connector import AirflowEntryData
 from elyra.pipeline.catalog_connector import ComponentCatalogConnector
 from elyra.pipeline.catalog_connector import EntryData
+from elyra.util.url import FileTransportAdapter
 
 
 class AirflowProviderPackageCatalogConnector(ComponentCatalogConnector):
@@ -79,20 +80,22 @@ def get_catalog_entries(self, catalog_metadata: Dict[str, Any]) -> List[Dict[str
             )
             return operator_key_list
 
-        # determine whether authentication needs to be performed
-        auth_id = catalog_metadata.get("auth_id")
-        auth_password = catalog_metadata.get("auth_password")
-        if auth_id and auth_password:
-            auth = HTTPBasicAuth(auth_id, auth_password)
-        elif auth_id or auth_password:
-            self.log.error(
-                f"Error. Airflow provider package connector '{catalog_metadata.get('display_name')}' "
-                "is not configured properly. "
-                "Authentication requires a user id and password or API key."
-            )
-            return operator_key_list
-        else:
-            auth = None
+        pr = urlparse(airflow_provider_package_download_url)
+        auth = None
+
+        if pr.scheme != "file":
+            # determine whether authentication needs to be performed
+            auth_id = catalog_metadata.get("auth_id")
+            auth_password = catalog_metadata.get("auth_password")
+            if auth_id and auth_password:
+                auth = HTTPBasicAuth(auth_id, auth_password)
+            elif auth_id or auth_password:
+                self.log.error(
+                    f"Error. Airflow provider package connector '{catalog_metadata.get('display_name')}' "
+                    "is not configured properly. "
+                    "Authentication requires a user id and password or API key."
+                )
+                return operator_key_list
 
         # tmp_archive_dir is used to store the downloaded archive and as working directory
         if hasattr(self, "tmp_archive_dir"):
@@ -105,7 +108,10 @@ def get_catalog_entries(self, catalog_metadata: Dict[str, Any]) -> List[Dict[str
 
             # download archive
             try:
-                response = get(
+                requests_session = session()
+                if pr.scheme == "file":
+                    requests_session.mount("file://", FileTransportAdapter())
+                response = requests_session.get(
                     airflow_provider_package_download_url,
                     timeout=AirflowProviderPackageCatalogConnector.REQUEST_TIMEOUT,
                     allow_redirects=True,

elyra/pipeline/catalog_connector.py

@@ -26,10 +26,11 @@
 from typing import Dict
 from typing import List
 from typing import Optional
+from urllib.parse import urlparse
 
 from deprecation import deprecated
 from jupyter_core.paths import ENV_JUPYTER_PATH
-from requests import get
+from requests import session
 from requests.auth import HTTPBasicAuth
 from traitlets.config import LoggingConfigurable
 from traitlets.traitlets import default
@@ -40,6 +41,7 @@
 from elyra.pipeline.component import Component
 from elyra.pipeline.component import ComponentParameter
 from elyra.pipeline.runtime_type import RuntimeProcessorType
+from elyra.util.url import FileTransportAdapter
 
 
 class EntryData(object):
@@ -636,24 +638,28 @@ def get_entry_data(
             individual catalog entries
         """
         url = catalog_entry_data.get("url")
-
-        # determine whether authentication needs to be performed
-        auth_id = catalog_metadata.get("auth_id")
-        auth_password = catalog_metadata.get("auth_password")
-        if auth_id and auth_password:
-            auth = HTTPBasicAuth(auth_id, auth_password)
-        elif auth_id or auth_password:
-            self.log.error(
-                f"Error. URL catalog connector '{catalog_metadata.get('display_name')}' "
-                "is not configured properly. "
-                "Authentication requires a user id and password or API key."
-            )
-            return None
-        else:
-            auth = None
+        pr = urlparse(url)
+        auth = None
+
+        if pr.scheme != "file":
+            # determine whether authentication needs to be performed
+            auth_id = catalog_metadata.get("auth_id")
+            auth_password = catalog_metadata.get("auth_password")
+            if auth_id and auth_password:
+                auth = HTTPBasicAuth(auth_id, auth_password)
+            elif auth_id or auth_password:
+                self.log.error(
+                    f"Error. URL catalog connector '{catalog_metadata.get('display_name')}' "
+                    "is not configured properly. "
+                    "Authentication requires a user id and password or API key."
+                )
+                return None
 
         try:
-            res = get(
+            requests_session = session()
+            if pr.scheme == "file":
+                requests_session.mount("file://", FileTransportAdapter())
+            res = requests_session.get(
                 url,
                 timeout=UrlComponentCatalogConnector.REQUEST_TIMEOUT,
                 allow_redirects=True,

elyra/tests/pipeline/airflow/test_airflow_package_connector.py

@@ -15,6 +15,7 @@
 #
 
 import io
+from pathlib import Path
 import zipfile
 
 from elyra.pipeline.airflow.package_catalog_connector.airflow_package_catalog_connector import (
@@ -84,6 +85,31 @@ def test_invalid_download_input(requests_mock):
     assert len(ce) == 0
 
 
+def test_invalid_get_entry_data():
+    """
+    Validate that AirflowPackageCatalogConnector.get_entry_data(...) returns
+    the expected results for invalid inputs
+    """
+    apc = AirflowPackageCatalogConnector(AIRFLOW_SUPPORTED_FILE_TYPES)
+
+    # Test invalid "file://" inputs ...
+    # ... input refers to a directory
+    resource_location = Path(__file__).parent / ".." / "resources" / "components"
+    resource_url = resource_location.as_uri()
+    ce = apc.get_catalog_entries({"airflow_package_download_url": resource_url, "display_name": "file://is-a-dir-test"})
+    assert isinstance(ce, list), resource_url
+    assert len(ce) == 0
+
+    # ... input refers to a non-existing whl file
+    resource_location = Path(__file__).parent / ".." / "resources" / "components" / "no-such.whl"
+    resource_url = resource_location.as_uri()
+    ce = apc.get_catalog_entries(
+        {"airflow_package_download_url": resource_url, "display_name": "file://no-such-file-test"}
+    )
+    assert isinstance(ce, list), resource_url
+    assert len(ce) == 0
+
+
 # -----------------------------------
 # Long running test(s)
 # ----------------------------------