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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::{BufReader, Read};
use std::net::IpAddr;
use url::Url;
lazy_static! {
static ref HOST_TABLE: Option<HashMap<String, IpAddr>> = create_host_table();
}
fn create_host_table() -> Option<HashMap<String, IpAddr>> {
//TODO: handle bad file path
let path = match env::var("HOST_FILE") {
Ok(host_file_path) => host_file_path,
Err(_) => return None,
};
let mut file = match File::open(&path) {
Ok(f) => BufReader::new(f),
Err(_) => return None,
};
let mut lines = String::new();
match file.read_to_string(&mut lines) {
Ok(_) => (),
Err(_) => return None,
};
return Some(parse_hostsfile(&lines));
}
pub fn parse_hostsfile(hostsfile_content: &str) -> HashMap<String, IpAddr> {
let mut host_table = HashMap::new();
for line in hostsfile_content.split('\n') {
let ip_host: Vec<&str> = line.trim().split(|c: char| c == ' ' || c == '\t').collect();
if ip_host.len() > 1 {
if let Ok(address) = ip_host[0].parse::<IpAddr>() {
for token in ip_host.iter().skip(1) {
if token.as_bytes()[0] == b'#' {
break;
}
host_table.insert((*token).to_owned(), address);
}
}
}
}
host_table
}
pub fn replace_hosts(url: &Url) -> Url {
HOST_TABLE.as_ref().map_or_else(|| url.clone(), |host_table| {
host_replacement(host_table, url)
})
}
pub fn host_replacement(host_table: &HashMap<String, IpAddr>,
url: &Url) -> Url {
url.domain().and_then(|domain| host_table.get(domain).map(|ip| {
let mut new_url = url.clone();
new_url.set_ip_host(*ip).unwrap();
new_url
})).unwrap_or_else(|| url.clone())
}
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