Added automatic creation of .netrc if none exists to address issue #93

CHANGELOG.md

@@ -4,8 +4,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
+### Fixed
 ### Added
 - Added error messages to inform user if .harmony file is formatted incorrectly or missing a key
+- Added error message if .netrc file is not found and prompt for Earthdata login credentials to create a .netrc in the user's home directory
+- Added note about how to change permission of .netrc file for mac and linux
+### Changed
 
 ## [1.15.2]
 ### Fixed

README.md

@@ -91,7 +91,9 @@ machine urs.earthdata.nasa.gov
     password podaacIsAwesome
 ```
 
-**If the script cannot find the netrc file, you will be prompted to enter the username and password and the script wont be able to generate the CMR token**
+**If the script cannot find the netrc file, you will be prompted to enter the username and password to create one automatically. Without a netrc file the script won't be able to generate the CMR token**
+
+**If using MacOS or Linux you will need to change the permissions of the netrc file by running chmod og-rw .netrc**
 
 
 ## Advanced Usage

subscriber/podaac_access.py

@@ -25,6 +25,8 @@
 import requests
 import tenacity
 from datetime import datetime
+import getpass
+import platform
 
 __version__ = "1.15.2"
 extensions = ["\\.nc", "\\.h5", "\\.zip", "\\.tar.gz", "\\.tiff"]
@@ -64,6 +66,37 @@
 # notebook client in your browser.*
 
 
+def create_netrc_file(response):
+    """
+    Ask the user if they have created an Earthdata login
+    if so:
+    Prompt the user for their username and password
+    Use the credentials to create a .netrc file in the users home directory
+    if not:
+    Prompt the user to create an Earthdata login at the appropriate url
+    """
+    if response.lower() == 'y':
+        login = input('Enter your Earthdata username: ')
+        password = getpass.getpass('Enter your Earthdata password: ')
+        netrc_content = f"machine urs.earthdata.nasa.gov\n" \
+                        f"    login {login}\n" \
+                        f"    password {password}\n"
+
+        home_dir = os.path.expanduser("~")
+        file_path = os.path.join(home_dir, ".netrc")
+
+        with open(file_path, "w") as file:
+            file.write(netrc_content)
+
+        # running this on windows will cause the program to crash and is not necessary
+        if platform.system() != 'Windows':
+            # change .netrc permissions
+            subprocess.run(["chmod", "og-rw", file_path])
+
+    if response.lower() == 'n':
+        logging.info('Go to https://urs.earthdata.nasa.gov/users/new to create an Earthdata login')
+        exit()
+
 def setup_earthdata_login_auth(endpoint):
     """
     Set up the request library so that it authenticates against the given
@@ -76,11 +109,16 @@ def setup_earthdata_login_auth(endpoint):
     """
     try:
         username, _, password = netrc.netrc().authenticators(endpoint)
-    except (FileNotFoundError, TypeError):
-        # FileNotFound = There's no .netrc file
-        # TypeError = The endpoint isn't in the netrc file,
-        #  causing the above to try unpacking None
-        logging.warning("There's no .netrc file or the The endpoint isn't in the netrc file")
+    # FileNotFound = There's no .netrc file
+    except FileNotFoundError:
+        logging.warning("No .netrc file can be found. One will be attempted to be created.")
+        create_netrc_file(input('Do you have an Earthdata login? (y/n): '))
+        username, _, password = netrc.netrc().authenticators(endpoint)
+    # TypeError = The endpoint isn't in the netrc file,
+    #  causing the below to try unpacking None
+    except TypeError:
+        logging.warning("The endpoint isn't in the netrc file or is incorrect")
+
 
     manager = request.HTTPPasswordMgrWithDefaultRealm()
     manager.add_password(None, endpoint, username, password)