Retrieves authentication token from environment variable, file, or direct
input.
Priority order: 1) Environment variable, 2) File path, 3) Direct token
string.
This function helps prevent accidental token exposure in code or logs.
Usage
get_token(token = NULL, env_var = "NASA_EARTHDATA_TOKEN")
Arguments
- token
character(1) or NULL. Can be:
NULL: reads from environment variable (recommended)
File path: reads token from file
Token string: uses directly (not recommended for scripts)
- env_var
character(1). Name of environment variable containing token.
Default is "NASA_EARTHDATA_TOKEN"
Value
character(1). The authentication token
