feat: add env variable support when initiating ONC class

Author: kan-fu

README.md

@@ -60,6 +60,7 @@ The example below uses the `getLocations` method to search for locations that in
 from onc import ONC
 
 onc = ONC("YOUR_TOKEN")
+onc = ONC() # This works if the env variable "ONC_TOKEN" is set
 
 onc.getLocations({"locationName": "Burrard"})
 ```

doc/source/Tutorial/onc_Library_Tutorial.ipynb

@@ -78,6 +78,8 @@
     "\n",
     "to indicate that you want to see verbose messages after running each method, and you want the download directory to be \"./YOUR_DIRECTORY\" instead of the default \"./output\" when calling methods that involve downloading files like `orderDataProduct` and `downloadArchivefile`.\n",
     "\n",
+    "You can also use `onc = ONC()` if you have set the env variable \"ONC_TOKEN\".\n",
+    "\n",
     "For more information, check the API reference of the [ONC](https://oceannetworkscanada.github.io/api-python-client/autoapi/onc/index.html#onc.ONC) class.\n"
    ]
   },

src/onc/onc.py

@@ -2,6 +2,7 @@
 
 import datetime
 import json
+import os
 import re
 from pathlib import Path
 
@@ -20,8 +21,9 @@ class ONC:
 
     Parameters
     ----------
-    token : str
+    token : str | None, default None
         The ONC API token, which could be retrieved at https://data.oceannetworks.ca/Profile once logged in.
+        If None, the token is read from the environment variable ``ONC_TOKEN``.
     production : boolean, default True
         Whether the ONC Production server URL is used for service requests.
 
@@ -44,19 +46,26 @@ class ONC:
     Examples
     --------
     >>> from onc import ONC
+    >>> onc = ONC()  # Only if you set the env variable "ONC_TOKEN" # doctest: +SKIP
     >>> onc = ONC("YOUR_TOKEN_HERE")  # doctest: +SKIP
     >>> onc = ONC("YOUR_TOKEN_HERE", showInfo=True, outPath="onc-files")  # doctest: +SKIP
     """  # noqa: E501
 
     def __init__(
         self,
-        token,
+        token: str | None = None,
         production: bool = True,
         showInfo: bool = False,
         showWarning: bool = False,
         outPath: str | Path = "output",
         timeout: int = 60,
     ):
+        if token is None or token == "":
+            token = os.environ.get("ONC_TOKEN")
+        if token is None or token == "":
+            raise ValueError(
+                "ONC API token is required. Please provide it as the first argument, "
+                "or set it as the environment variable 'ONC_TOKEN'.")
         self.token = re.sub(r"[^a-zA-Z0-9\-]+", "", token)
         self.showInfo = showInfo
         self.showWarning = showWarning

tests/conftest.py

@@ -6,7 +6,6 @@
 from onc import ONC
 
 load_dotenv(override=True)
-token = os.getenv("TOKEN")
 is_prod = os.getenv("ONC_ENV", "PROD") == "PROD"
 
 
@@ -17,7 +16,7 @@ def pytest_configure():
 
 @pytest.fixture
 def requester(tmp_path) -> ONC:
-    return ONC(token, is_prod, outPath=tmp_path)
+    return ONC(production=is_prod, outPath=tmp_path)
 
 
 @pytest.fixture(scope="session")