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feat: support parsing of system environment variables in yaml

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In order to allow the user to supply environment variables in standard
ways performed in other applications the get_scalar function has been
extended to support defining an environment variable in the format
`${FOO}`. Environment variables can be escaped via defining as `$${FOO}`.
As this handles some additional complexity, a unit test has been  added
to cover this new functionality

Signed-off-by: Daniel Wright <danielwright@bitgo.com>
This commit is contained in:
Daniel Wright 2023-05-22 16:54:56 +10:00 committed by poiana
parent 5ffffeeada
commit 513f122aff
2 changed files with 116 additions and 9 deletions
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72
unit_tests/falco/test_configuration.cpp
View File

@ -101,3 +101,75 @@ TEST(Configuration, modify_yaml_fields)
conf.set_scalar<bool>(key, true);
ASSERT_EQ(conf.get_scalar<bool>(key, false), true);
}
TEST(Configuration, configuration_environment_variables)
{
// Set an environment variable for testing purposes
std::string env_var_value = "envVarValue";
std::string env_var_name = "ENV_VAR";
std::string default_value = "default";
setenv(env_var_name.c_str(), env_var_value.c_str(), 1);
yaml_helper conf;
std::string sample_yaml =
"base_value:\n"
" id: $ENV_VAR\n"
" name: '${ENV_VAR}'\n"
" string: my_string\n"
" invalid: $${ENV_VAR}\n"
" invalid_env: $$ENV_VAR\n"
" escaped: \"${ENV_VAR}\"\n"
" subvalue:\n"
" subvalue2:\n"
" boolean: ${UNSED_XX_X_X_VAR}\n"
"base_value_2:\n"
" sample_list:\n"
" - ${ENV_VAR}\n"
" - ' ${ENV_VAR}'\n"
" - $UNSED_XX_X_X_VAR\n";
conf.load_from_string(sample_yaml);
/* Check if the base values are defined */
ASSERT_TRUE(conf.is_defined("base_value"));
ASSERT_TRUE(conf.is_defined("base_value_2"));
ASSERT_FALSE(conf.is_defined("unknown_base_value"));
/* Test fetching of a regular string without any environment variable */
std::string base_value_string = conf.get_scalar<std::string>("base_value.string", default_value);
ASSERT_EQ(base_value_string, "my_string");
/* Test fetching of escaped environment variable format. Should return the string as-is after stripping the leading `$` */
std::string base_value_invalid = conf.get_scalar<std::string>("base_value.invalid", default_value);
ASSERT_EQ(base_value_invalid, "${ENV_VAR}");
/* Test fetching of invalid escaped environment variable format. Should return the string as-is */
std::string base_value_invalid_env = conf.get_scalar<std::string>("base_value.invalid_env", default_value);
ASSERT_EQ(base_value_invalid_env, "$$ENV_VAR");
/* Test fetching of strings that contain environment variables */
std::string base_value_id = conf.get_scalar<std::string>("base_value.id", default_value);
ASSERT_EQ(base_value_id, "$ENV_VAR"); // Does not follow the `${VAR}` format, so it should be treated as a regular string
std::string base_value_name = conf.get_scalar<std::string>("base_value.name", default_value);
ASSERT_EQ(base_value_name, env_var_value); // Proper environment variable format
std::string base_value_escaped = conf.get_scalar<std::string>("base_value.escaped", default_value);
ASSERT_EQ(base_value_escaped, env_var_value); // Environment variable within quotes
/* Test fetching of an undefined environment variable. Expected to return the default value.*/
std::string unknown_boolean = conf.get_scalar<std::string>("base_value.subvalue.subvalue2.boolean", default_value);
ASSERT_EQ(unknown_boolean, default_value);
/* Test fetching of environment variables from a list */
std::string base_value_2_list_0 = conf.get_scalar<std::string>("base_value_2.sample_list[0]", default_value);
ASSERT_EQ(base_value_2_list_0, env_var_value); // Proper environment variable format
std::string base_value_2_list_1 = conf.get_scalar<std::string>("base_value_2.sample_list[1]", default_value);
ASSERT_EQ(base_value_2_list_1, " ${ENV_VAR}"); // Environment variable preceded by a space, hence treated as a regular string
std::string base_value_2_list_2 = conf.get_scalar<std::string>("base_value_2.sample_list[2]", default_value);
ASSERT_EQ(base_value_2_list_2, "$UNSED_XX_X_X_VAR"); // Does not follow the `${VAR}` format, so should be treated as a regular string
/* Clear the set environment variable after testing */
unsetenv(env_var_name.c_str());
}

35
userspace/falco/yaml_helper.h
View File

@ -72,6 +72,41 @@ public:
get_node(node, key);
if(node.IsDefined())
{
std::string value = node.as<std::string>();
// Helper function to convert string to the desired type T
auto convert_str_to_t = [&default_value](const std::string& str) -> T {
std::stringstream ss(str);
T result;
if (ss >> result) return result;
return default_value;
};
// If the value starts with `$$`, check for a subsequent `{...}`
if (value.size() >= 3 && value[0] == '$' && value[1] == '$')
{
// If after stripping the first `$`, the string format is like `${VAR}`, treat it as a plain string and don't resolve.
if (value[2] == '{' && value[value.size() - 1] == '}')
{
value = value.substr(1);
return convert_str_to_t(value);
}
else return convert_str_to_t(value);
}
// Check if the value is an environment variable reference
if(value.size() >= 2 && value[0] == '$' && value[1] == '{' && value[value.size() - 1] == '}')
{
// Format: ${ENV_VAR_NAME}
std::string env_var = value.substr(2, value.size() - 3);
const char* env_value = std::getenv(env_var.c_str()); // Get the environment variable value
if(env_value) return convert_str_to_t(env_value);
return default_value;
}
// If it's not an environment variable reference, return the value as is
return node.as<T>();
}