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use crate::is_null::IsNull;
use jnix::{
jni::{
objects::{JObject, JString},
sys::{jboolean, JNI_FALSE},
},
JnixEnv,
};
use mullvad_types::relay_constraints::{
Constraint, LocationConstraint, RelayConstraintsUpdate, RelaySettingsUpdate,
};
use std::fmt::Debug;
pub trait FromJava<'env> {
type JavaType: 'env;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self;
}
impl<'env> FromJava<'env> for bool {
type JavaType = jboolean;
fn from_java(_: &JnixEnv<'env>, source: Self::JavaType) -> Self {
source != JNI_FALSE
}
}
impl<'env, T> FromJava<'env> for Option<T>
where
T: FromJava<'env>,
T::JavaType: IsNull,
{
type JavaType = T::JavaType;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
if source.is_null() {
None
} else {
Some(T::from_java(env, source))
}
}
}
impl<'env> FromJava<'env> for String {
type JavaType = JString<'env>;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
String::from(
env.get_string(source)
.expect("Failed to convert from Java String"),
)
}
}
impl<'env, T> FromJava<'env> for Constraint<T>
where
T: Clone + Debug + Eq + FromJava<'env>,
T::JavaType: From<JObject<'env>>,
{
type JavaType = JObject<'env>;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
if is_instance_of(env, source, "net/mullvad/mullvadvpn/model/Constraint$Any") {
Constraint::Any
} else if is_instance_of(env, source, "net/mullvad/mullvadvpn/model/Constraint$Only") {
let value = get_object_field(env, source, "value", "Ljava/lang/Object;");
Constraint::Only(T::from_java(env, T::JavaType::from(value)))
} else {
panic!("Invalid Constraint Java sub-class");
}
}
}
impl<'env> FromJava<'env> for LocationConstraint {
type JavaType = JObject<'env>;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
let country_class = "net/mullvad/mullvadvpn/model/LocationConstraint$Country";
let city_class = "net/mullvad/mullvadvpn/model/LocationConstraint$City";
let hostname_class = "net/mullvad/mullvadvpn/model/LocationConstraint$Hostname";
if is_instance_of(env, source, country_class) {
let country = get_string_field(env, source, "countryCode");
LocationConstraint::Country(String::from_java(env, country))
} else if is_instance_of(env, source, city_class) {
let country = get_string_field(env, source, "countryCode");
let city = get_string_field(env, source, "cityCode");
LocationConstraint::City(
String::from_java(env, country),
String::from_java(env, city),
)
} else if is_instance_of(env, source, hostname_class) {
let country = get_string_field(env, source, "countryCode");
let city = get_string_field(env, source, "cityCode");
let hostname = get_string_field(env, source, "hostname");
LocationConstraint::Hostname(
String::from_java(env, country),
String::from_java(env, city),
String::from_java(env, hostname),
)
} else {
panic!("Invalid LocationConstraint Java sub-class");
}
}
}
impl<'env> FromJava<'env> for RelayConstraintsUpdate {
type JavaType = JObject<'env>;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
let location = get_object_field(
env,
source,
"location",
"Lnet/mullvad/mullvadvpn/model/Constraint;",
);
RelayConstraintsUpdate {
location: FromJava::from_java(env, location),
tunnel_protocol: None,
openvpn_constraints: None,
wireguard_constraints: None,
}
}
}
impl<'env> FromJava<'env> for RelaySettingsUpdate {
type JavaType = JObject<'env>;
fn from_java(env: &JnixEnv<'env>, source: Self::JavaType) -> Self {
let custom_tunnel_endpoint_class =
"net/mullvad/mullvadvpn/model/RelaySettingsUpdate$CustomTunnelEndpoint";
let relay_constraints_update_class =
"net/mullvad/mullvadvpn/model/RelaySettingsUpdate$RelayConstraintsUpdate";
if is_instance_of(env, source, custom_tunnel_endpoint_class) {
unimplemented!("Can't specify custom tunnels from Android app");
} else if is_instance_of(env, source, relay_constraints_update_class) {
RelaySettingsUpdate::Normal(RelayConstraintsUpdate::from_java(env, source))
} else {
panic!("Invalid RelaySettingsUpdate Java sub-class");
}
}
}
fn is_instance_of<'env>(
env: &JnixEnv<'env>,
object: JObject<'env>,
class_name: &'static str,
) -> bool {
let class = env.get_class(class_name);
env.is_instance_of(object, &class)
.expect("Failed to check if an object is an instance of a specified class")
}
fn get_string_field<'env>(
env: &JnixEnv<'env>,
object: JObject<'env>,
field_name: &str,
) -> JString<'env> {
JString::from(get_object_field(
env,
object,
field_name,
"Ljava/lang/String;",
))
}
fn get_object_field<'env>(
env: &JnixEnv<'env>,
object: JObject<'env>,
field_name: &str,
field_type: &str,
) -> JObject<'env> {
env.get_field(object, field_name, field_type)
.expect("Failed to get field from object")
.l()
.expect("Field has incorrect Java type")
}
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