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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.autofillframework.service.datasource;
import android.content.Context;
import android.content.SharedPreferences;
import android.util.ArraySet;
import com.example.android.autofillframework.service.model.ClientFormData;
import com.google.gson.Gson;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
/**
* Singleton autofill data repository that stores autofill fields to SharedPreferences.
* Disclaimer: you should not store sensitive fields like user data unencrypted. This is done
* here only for simplicity and learning purposes.
*/
public class SharedPrefsAutofillRepository implements AutofillRepository {
private static final String SHARED_PREF_KEY = "com.example.android.autofillframework.service";
private static final String CLIENT_FORM_DATA_KEY = "loginCredentialDatasets";
private static final String DATASET_NUMBER_KEY = "datasetNumber";
private static SharedPrefsAutofillRepository sInstance;
private final SharedPreferences mPrefs;
private SharedPrefsAutofillRepository(Context context) {
mPrefs = context.getApplicationContext()
.getSharedPreferences(SHARED_PREF_KEY, Context.MODE_PRIVATE);
}
public static SharedPrefsAutofillRepository getInstance(Context context) {
if (sInstance == null) {
sInstance = new SharedPrefsAutofillRepository(context);
}
return sInstance;
}
@Override
public HashMap<String, ClientFormData> getClientFormData(List<String> focusedAutofillHints,
List<String> allAutofillHints) {
boolean hasDataForFocusedAutofillHints = false;
HashMap<String, ClientFormData> clientFormDataMap = new HashMap<>();
Set<String> clientFormDataStringSet = getAllAutofillDataStringSet();
for (String clientFormDataString : clientFormDataStringSet) {
ClientFormData clientFormData = new Gson().fromJson(clientFormDataString, ClientFormData.class);
if (clientFormData != null) {
if (clientFormData.helpsWithHints(focusedAutofillHints)) {
// Saved data has data relevant to at least 1 of the hints associated with the
// View in focus.
hasDataForFocusedAutofillHints = true;
}
if (clientFormData.helpsWithHints(allAutofillHints)) {
// Saved data has data relevant to at least 1 of these hints associated with any
// of the Views in the hierarchy.
clientFormDataMap.put(clientFormData.getDatasetName(), clientFormData);
}
}
}
if (hasDataForFocusedAutofillHints) {
return clientFormDataMap;
} else {
return null;
}
}
@Override
public void saveClientFormData(ClientFormData clientFormData) {
String datasetName = "dataset-" + getDatasetNumber();
clientFormData.setDatasetName(datasetName);
Set<String> allAutofillData = getAllAutofillDataStringSet();
allAutofillData.add(new Gson().toJson(clientFormData));
saveAllAutofillDataStringSet(allAutofillData);
incrementDatasetNumber();
}
@Override
public void clear() {
mPrefs.edit().remove(CLIENT_FORM_DATA_KEY).apply();
}
private Set<String> getAllAutofillDataStringSet() {
return mPrefs.getStringSet(CLIENT_FORM_DATA_KEY, new ArraySet<String>());
}
private void saveAllAutofillDataStringSet(Set<String> allAutofillDataStringSet) {
mPrefs.edit().putStringSet(CLIENT_FORM_DATA_KEY, allAutofillDataStringSet).apply();
}
/**
* For simplicity, datasets will be named in the form "dataset-X" where X means
* this was the Xth dataset saved.
*/
private int getDatasetNumber() {
return mPrefs.getInt(DATASET_NUMBER_KEY, 0);
}
/**
* Every time a dataset is saved, this should be called to increment the dataset number.
* (only important for this service's dataset naming scheme).
*/
private void incrementDatasetNumber() {
mPrefs.edit().putInt(DATASET_NUMBER_KEY, getDatasetNumber() + 1).apply();
}
}
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