group policy: cleanups

* Rename `PolicyId` to `PolicyID`
* Config: policy group policies are now stored inside of a key named
  `policies` instead of `members`
* `EvaluationEnvironment`: introduce builder patter, remove duplication
  between policies and group policies

Signed-off-by: Flavio Castelli <fcastelli@suse.com>

src/api/service.rs

@@ -9,7 +9,7 @@ use tracing::info;
 
 use crate::{
     config::PolicyMode,
-    evaluation::{errors::EvaluationError, EvaluationEnvironment, PolicyId},
+    evaluation::{errors::EvaluationError, EvaluationEnvironment, PolicyID},
     metrics,
 };
 
@@ -34,7 +34,7 @@ pub(crate) fn evaluate(
     request_origin: RequestOrigin,
 ) -> Result<AdmissionResponse, EvaluationError> {
     let start_time = Instant::now();
-    let policy_id: PolicyId = policy_id.parse()?;
+    let policy_id: PolicyID = policy_id.parse()?;
 
     let vanilla_validation_response = match evaluation_environment
         .clone()
@@ -147,7 +147,7 @@ pub(crate) fn evaluate(
 // - A policy might be running in "Monitor" mode, that always
 //   accepts the request (without mutation), logging the answer
 fn validation_response_with_constraints(
-    policy_id: &PolicyId,
+    policy_id: &PolicyID,
     policy_mode: &PolicyMode,
     allowed_to_mutate: bool,
     validation_response: AdmissionResponse,
@@ -204,7 +204,7 @@ mod tests {
     use super::*;
 
     lazy_static! {
-        static ref POLICY_ID: PolicyId = PolicyId::Policy("policy-id".to_string());
+        static ref POLICY_ID: PolicyID = PolicyID::Policy("policy-id".to_string());
     }
 
     fn create_evaluation_environment_that_accepts_request(

src/config.rs

@@ -207,23 +207,23 @@ fn policies(matches: &clap::ArgMatches) -> Result<HashMap<String, PolicyOrPolicy
 
 // Validate the policies and policy groups:
 //  - ensure policy names do not contain a '/' character
-//  - ensure names of policy group members do not contain a '/' character
+//  - ensure names of policy group's policies do not contain a '/' character
 fn validate_policies(policies: &HashMap<String, PolicyOrPolicyGroup>) -> Result<()> {
     for (name, policy) in policies.iter() {
         if name.contains('/') {
             return Err(anyhow!("policy name '{}' contains a '/' character", name));
         }
-        if let PolicyOrPolicyGroup::PolicyGroup { members, .. } = policy {
-            let members_with_invalid_name: Vec<String> = members
+        if let PolicyOrPolicyGroup::PolicyGroup { policies, .. } = policy {
+            let policies_with_invalid_name: Vec<String> = policies
                 .iter()
                 .filter_map(|(id, _)| if id.contains('/') { Some(id) } else { None })
                 .cloned()
                 .collect();
-            if !members_with_invalid_name.is_empty() {
+            if !policies_with_invalid_name.is_empty() {
                 return Err(anyhow!(
-                    "policy group '{}' contains members with invalid names: {:?}",
+                    "policy group '{}' contains policies with invalid names: {:?}",
                     name,
-                    members_with_invalid_name
+                    policies_with_invalid_name
                 ));
             }
         }
@@ -307,7 +307,7 @@ pub enum PolicyOrPolicyGroupSettings {
     PolicyGroup {
         expression: String,
         message: String,
-        members: Vec<String>,
+        policies: Vec<String>,
     },
 }
 
@@ -357,8 +357,7 @@ pub enum PolicyOrPolicyGroup {
         policy_mode: PolicyMode,
         /// The policies that make up for this group
         /// Key is a unique identifier
-        #[serde(rename = "policies")]
-        members: HashMap<String, PolicyGroupMember>,
+        policies: HashMap<String, PolicyGroupMember>,
         /// The expression that is used to evaluate the group of policies
         expression: String,
         /// The message that is returned when the group of policies evaluates to false
@@ -376,12 +375,12 @@ impl PolicyOrPolicyGroup {
             PolicyOrPolicyGroup::PolicyGroup {
                 expression,
                 message,
-                members: policies,
+                policies,
                 ..
             } => Ok(PolicyOrPolicyGroupSettings::PolicyGroup {
                 expression: expression.clone(),
                 message: message.clone(),
-                members: policies.keys().cloned().collect(),
+                policies: policies.keys().cloned().collect(),
             }),
         }
     }

src/evaluation.rs

@@ -7,5 +7,7 @@ pub(crate) mod precompiled_policy;
 #[mockall_double::double]
 pub(crate) use evaluation_environment::EvaluationEnvironment;
 
+pub(crate) use evaluation_environment::EvaluationEnvironmentBuilder;
+
 pub(crate) mod policy_id;
-pub(crate) use policy_id::PolicyId;
+pub(crate) use policy_id::PolicyID;