Added a restriction for IANA domain zones. Users cannot mine them from now on.

build.rs

@@ -1,9 +1,67 @@
 extern crate winres;
 
+use std::fs::File;
+use std::path::Path;
+use std::io::Write;
+
+use crypto::digest::Digest;
+use crypto::sha2::Sha256;
+
 fn main() {
     if cfg!(target_os = "windows") {
         let mut res = winres::WindowsResource::new();
         res.set_icon("globe_icon.ico");
         res.compile().unwrap();
     }
+
+    download_iana_zones("iana-tlds.txt", "iana-hashes.txt");
+}
+
+fn download_iana_zones(zones_name: &str, hashes_name: &str) {
+    let response = minreq::get("https://data.iana.org/TLD/tlds-alpha-by-domain.txt").send().expect("Could not make request!");
+
+    let response = response.as_str().expect("Response is not a valid UTF-8!").to_lowercase();
+    let list: Vec<_> = response.split("\n").collect();
+    let mut zones = String::new();
+    let mut hashes = String::new();
+    for string in list {
+        if !string.starts_with("#") && !string.is_empty() {
+            zones.push_str(string);
+            zones.push('\n');
+
+            hashes.push_str(&hash_identity(string));
+            hashes.push('\n');
+        }
+    }
+
+    match File::create(Path::new(zones_name)) {
+        Ok(mut file) => {
+            file.write_all(zones.trim().as_bytes()).expect("Error saving TLDs file!");
+        }
+        Err(e) => { println!("Error opening TLDs file!\n{}", e); }
+    }
+
+    match File::create(Path::new(hashes_name)) {
+        Ok(mut file) => {
+            file.write_all(hashes.trim().as_bytes()).expect("Error saving TLD-hashes file!");
+        }
+        Err(e) => { println!("Error opening TLD-hashes file!\n{}", e); }
+    }
+}
+
+fn hash_identity(identity: &str) -> String {
+    let mut buf: [u8; 32] = [0; 32];
+    let mut digest = Sha256::new();
+    digest.input_str(identity);
+    digest.result(&mut buf);
+    to_hex(&buf)
+}
+
+/// Convert bytes array to HEX format
+pub fn to_hex(buf: &[u8]) -> String {
+    let mut result = String::new();
+    for x in buf.iter() {
+        result.push_str(&format!("{:01$X}", x, 2));
+    }
+    result
 }