Blacklisted items are removed when calling getServices/Characteristics/Descriptors.

components/bluetooth_traits/Cargo.toml

@@ -11,5 +11,7 @@ path = "lib.rs"
 
 [dependencies]
 ipc-channel = "0.5"
+regex = "0.1.43"
 serde = "0.8"
 serde_derive = "0.8"
+util = {path = "../util"}

components/bluetooth_traits/blacklist.rs

@@ -0,0 +1,124 @@
+/* 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);
+}

components/bluetooth_traits/lib.rs

@@ -5,9 +5,12 @@
 #![feature(proc_macro)]
 
 extern crate ipc_channel;
+extern crate regex;
 #[macro_use]
 extern crate serde_derive;
+extern crate util;
 
+pub mod blacklist;
 pub mod scanfilter;
 
 use ipc_channel::ipc::IpcSender;