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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <jni.h>
#include <optional>
#include <string>
#include "base/android/jni_array.h"
#include "base/android/jni_bytebuffer.h"
#include "base/android/jni_string.h"
#include "base/android/scoped_java_ref.h"
#include "base/check.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/values.h"
#include "components/webauthn/json/value_conversions.h"
#include "third_party/blink/public/mojom/webauthn/authenticator.mojom.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "components/webauthn/android/jni_headers/Fido2CredentialRequest_jni.h"
namespace webauthn {
namespace {
// MojoClassToJSON takes a serialized Mojo object and returns a Java String
// containing its JSON representation.
template <typename MojoClass>
static base::android::ScopedJavaLocalRef<jstring> MojoClassToJSON(
JNIEnv* env,
const base::android::JavaParamRef<jobject>& byte_buffer) {
auto span = base::android::JavaByteBufferToSpan(env, byte_buffer.obj());
auto options = MojoClass::New();
CHECK(MojoClass::Deserialize(span.data(), span.size(), &options));
base::Value value = webauthn::ToValue(options);
std::string json;
base::JSONWriter::Write(value, &json);
return base::android::ConvertUTF8ToJavaString(env, json);
}
// MojoClassFromJSON takes a Java String, parses it as JSON, and then parses
// that with `parse_func` to produce a Mojo object whose serialisation is
// returned as a Java byte[].
template <typename MojoClass, typename ParseFuncType>
static base::android::ScopedJavaLocalRef<jbyteArray> MojoClassFromJSON(
JNIEnv* env,
ParseFuncType parse_func,
const base::android::JavaParamRef<jstring>& jjson) {
const std::string json = base::android::ConvertJavaStringToUTF8(env, jjson);
const std::optional<base::Value> parsed =
base::JSONReader::Read(json, base::JSON_PARSE_RFC);
if (!parsed) {
LOG(ERROR) << __func__ << " failed to parse JSON";
return nullptr;
}
const auto pair = parse_func(*parsed);
if (!pair.first) {
LOG(ERROR) << __func__ << " failed to convert JSON: " << pair.second;
return nullptr;
}
return base::android::ToJavaByteArray(env, MojoClass::Serialize(&pair.first));
}
} // namespace
static base::android::ScopedJavaLocalRef<jstring>
JNI_Fido2CredentialRequest_CreateOptionsToJson(
JNIEnv* env,
const base::android::JavaParamRef<jobject>& byte_buffer) {
return MojoClassToJSON<blink::mojom::PublicKeyCredentialCreationOptions>(
env, byte_buffer);
}
static base::android::ScopedJavaLocalRef<jbyteArray>
JNI_Fido2CredentialRequest_MakeCredentialResponseFromJson(
JNIEnv* env,
const base::android::JavaParamRef<jstring>& jjson) {
return MojoClassFromJSON<blink::mojom::MakeCredentialAuthenticatorResponse>(
env, webauthn::MakeCredentialResponseFromValue, jjson);
}
static base::android::ScopedJavaLocalRef<jstring>
JNI_Fido2CredentialRequest_GetOptionsToJson(
JNIEnv* env,
const base::android::JavaParamRef<jobject>& byte_buffer) {
return MojoClassToJSON<blink::mojom::PublicKeyCredentialRequestOptions>(
env, byte_buffer);
}
static base::android::ScopedJavaLocalRef<jbyteArray>
JNI_Fido2CredentialRequest_GetCredentialResponseFromJson(
JNIEnv* env,
const base::android::JavaParamRef<jstring>& jjson) {
return MojoClassFromJSON<blink::mojom::GetAssertionAuthenticatorResponse>(
env, webauthn::GetAssertionResponseFromValue, jjson);
}
} // namespace webauthn
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