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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 regex::Regex;
use std::cell::RefCell;
use std::collections::HashMap;
use std::io::BufRead;
use std::string::String;
use util::resource_files::read_resource_file;
const BLACKLIST_FILE: &'static str = "gatt_blacklist.txt";
const BLACKLIST_FILE_NOT_FOUND: &'static str = "Could not find gatt_blacklist.txt file";
const EXCLUDE_READS: &'static str = "exclude-reads";
const EXCLUDE_WRITES: &'static str = "exclude-writes";
const VALID_UUID_REGEX: &'static str = "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}";
thread_local!(pub static BLUETOOTH_BLACKLIST: RefCell<BluetoothBlacklist> =
RefCell::new(BluetoothBlacklist(parse_blacklist())));
pub fn uuid_is_blacklisted(uuid: &str, exclude_type: Blacklist) -> bool {
BLUETOOTH_BLACKLIST.with(|blist| {
match exclude_type {
Blacklist::All => {
blist.borrow().is_blacklisted(uuid)
},
Blacklist::Reads => {
blist.borrow().is_blacklisted_for_reads(uuid)
}
Blacklist::Writes => {
blist.borrow().is_blacklisted_for_writes(uuid)
}
}
})
}
pub struct BluetoothBlacklist(Option<HashMap<String, Blacklist>>);
#[derive(Eq, PartialEq)]
pub enum Blacklist {
All, // Read and Write
Reads,
Writes,
}
impl BluetoothBlacklist {
// https://webbluetoothcg.github.io/web-bluetooth/#blacklisted
pub fn is_blacklisted(&self, uuid: &str) -> bool {
match self.0 {
Some(ref map) => map.get(uuid).map_or(false, |et| et.eq(&Blacklist::All)),
None => false,
}
}
// https://webbluetoothcg.github.io/web-bluetooth/#blacklisted-for-reads
pub fn is_blacklisted_for_reads(&self, uuid: &str) -> bool {
match self.0 {
Some(ref map) => map.get(uuid).map_or(false, |et| et.eq(&Blacklist::All) ||
et.eq(&Blacklist::Reads)),
None => false,
}
}
// https://webbluetoothcg.github.io/web-bluetooth/#blacklisted-for-writes
pub fn is_blacklisted_for_writes(&self, uuid: &str) -> bool {
match self.0 {
Some(ref map) => map.get(uuid).map_or(false, |et| et.eq(&Blacklist::All) ||
et.eq(&Blacklist::Writes)),
None => false,
}
}
}
// https://webbluetoothcg.github.io/web-bluetooth/#parsing-the-blacklist
fn parse_blacklist() -> Option<HashMap<String, Blacklist>> {
// Step 1 missing, currently we parse ./resources/gatt_blacklist.txt.
let valid_uuid_regex = Regex::new(VALID_UUID_REGEX).unwrap();
let content = read_resource_file(BLACKLIST_FILE).expect(BLACKLIST_FILE_NOT_FOUND);
// Step 3
let mut result = HashMap::new();
// Step 2 and 4
for line in content.lines() {
let line = match line {
Ok(l) => l,
Err(_) => return None,
};
// Step 4.1
if line.is_empty() || line.starts_with('#') {
continue;
}
let mut exclude_type = Blacklist::All;
let mut words = line.split_whitespace();
let uuid = match words.next() {
Some(uuid) => uuid,
None => continue,
};
if !valid_uuid_regex.is_match(uuid) {
return None;
}
match words.next() {
// Step 4.2 We already have an initialized exclude_type variable with Blacklist::All.
None => {},
// Step 4.3
Some(EXCLUDE_READS) => {
exclude_type = Blacklist::Reads;
},
Some(EXCLUDE_WRITES) => {
exclude_type = Blacklist::Writes;
},
// Step 4.4
_ => {
return None;
},
}
// Step 4.5
if result.contains_key(uuid) {
return None;
}
// Step 4.6
result.insert(uuid.to_string(), exclude_type);
}
// Step 5
return Some(result);
}
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