api2/node/time.rs: implement read api

src/api2/node/time.rs

@@ -5,13 +5,34 @@ use crate::api::schema::*;
 use crate::api::router::*;
 use serde_json::{json, Value};
 
+use chrono::prelude::*;
+
+fn read_etc_localtime() -> Result<String, Error> {
+
+    let file = std::fs::File::open("/etc/timezone")?;
+
+    use std::io::{BufRead, BufReader};
+
+    let mut reader = BufReader::new(file);
+
+    let mut line = String::new();
+
+    let _ = reader.read_line(&mut line)?;
+
+    Ok(line.trim().to_owned())
+}
 
 fn get_time(_param: Value, _info: &ApiMethod) -> Result<Value, Error> {
 
+    let datetime = Local::now();
+    let offset = datetime.offset();
+    let time = datetime.timestamp();
+    let localtime = time + (offset.fix().local_minus_utc() as i64);
+
     Ok(json!({
-        "timezone": "Europe/Vienna",
-        "time": 1297163644,
-        "localtime": 1297163644,
+        "timezone": read_etc_localtime()?,
+        "time": time,
+        "localtime": localtime,
     }))
 }