implement directory option

src/detections/detection.rs

@@ -1,13 +1,15 @@
 extern crate chrono;
 extern crate csv;
 
+use std::path::PathBuf;
+
 use crate::detections::print::Message;
 use crate::detections::rule;
 use crate::detections::rule::RuleNode;
 use crate::yaml::ParseYaml;
 
-use chrono::{DateTime, FixedOffset, TimeZone, Utc};
-use evtx::EvtxParser;
+use evtx::err;
+use evtx::{EvtxParser, SerializedEvtxRecord};
 use serde_json::{Error, Value};
 
 const DIRPATH_RULES: &str = "rules";
@@ -21,37 +23,92 @@ impl Detection {
         Detection {}
     }
 
-    pub fn start(&mut self, mut parser: EvtxParser<std::fs::File>) {
-        // serialize from .etvx to jsons
-        let event_records: Vec<Value> = parser
-            .records_json()
-            .filter_map(|result_record| {
-                if result_record.is_err() {
-                    eprintln!("{}", result_record.unwrap_err());
-                    return Option::None;
+    pub fn start(&mut self, evtx_files: Vec<PathBuf>) {
+        if evtx_files.is_empty() {
+            return;
+        }
+
+        // parse rule files
+        let mut selection_rules = self.parse_rule_files();
+        if selection_rules.is_empty() {
+            return;
+        }
+
+        // serialize from evtx files to json
+        let evtx_records = self.serialize_evtx_to_jsons(evtx_files);
+
+        // select rule files and collect message
+        let mut message = Message::new();
+        selection_rules.iter_mut().for_each(|rule| {
+            evtx_records.iter().for_each(|event_record| {
+                if !rule.select(event_record) {
+                    return;
                 }
 
-                //// https://rust-lang-nursery.github.io/rust-cookbook/encoding/complex.html
-                let result_json: Result<Value, Error> =
-                    serde_json::from_str(&result_record.unwrap().data);
+                message.insert(
+                    event_record,
+                    rule.yaml["output"].as_str().unwrap_or("").to_string(),
+                )
+            });
+        });
+
+        // output message
+        message.print();
+    }
+
+    // serialize evtx files to json
+    fn serialize_evtx_to_jsons(&self, evtx_files: Vec<PathBuf>) -> Vec<Value> {
+        return evtx_files
+            .iter()
+            .filter_map(|evtx_file| {
+                // convert to evtx parser
+                match EvtxParser::from_path(evtx_file) {
+                    Ok(parser) => Option::Some(parser),
+                    Err(e) => {
+                        eprintln!("{}", e);
+                        return Option::None;
+                    }
+                }
+            })
+            .map(|mut cur| {
+                let ret: Vec<err::Result<SerializedEvtxRecord<String>>> =
+                    cur.records_json().collect();
+                return ret;
+            })
+            .flatten()
+            .filter_map(|json_record| {
+                // convert from evtx parser to evtx json string records
+                if json_record.is_ok() {
+                    return Option::Some(json_record.unwrap());
+                } else {
+                    eprintln!("{}", json_record.unwrap_err());
+                    return Option::None;
+                }
+            })
+            .filter_map(|json_record| {
+                // serialize json from json string
+                let result_json: Result<Value, Error> = serde_json::from_str(&json_record.data); //// https://rust-lang-nursery.github.io/rust-cookbook/encoding/complex.html
                 if result_json.is_err() {
                     eprintln!("{}", result_json.unwrap_err());
                     return Option::None;
+                } else {
+                    return result_json.ok();
                 }
-                return result_json.ok();
             })
             .collect();
+    }
 
+    fn parse_rule_files(&self) -> Vec<RuleNode> {
         // load rule files
         let mut rulefile_loader = ParseYaml::new();
         let resutl_readdir = rulefile_loader.read_dir(DIRPATH_RULES);
         if resutl_readdir.is_err() {
             eprintln!("{}", resutl_readdir.unwrap_err());
-            return;
+            return vec![];
         }
 
         // parse rule files
-        let mut selection_rules: Vec<RuleNode> = rulefile_loader
+        return rulefile_loader
             .files
             .into_iter()
             .map(|rule_file| rule::parse_rule(rule_file))
@@ -79,23 +136,5 @@ impl Detection {
                 return Option::None;
             })
             .collect();
-
-        // selection rule files and collect message
-        let mut message = Message::new();
-        selection_rules.iter_mut().for_each(|rule| {
-            event_records.iter().for_each(|event_record| {
-                if !rule.select(event_record) {
-                    return;
-                }
-
-                message.insert(
-                    event_record,
-                    rule.yaml["output"].as_str().unwrap_or("").to_string(),
-                )
-            });
-        });
-
-        // output message
-        message.print();
     }
 }