Java tutorial
/* * Copyright 2014-2016 Open Networking Laboratory * * 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 org.onosproject.north.aaa.api.parser.impl; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.JsonToken; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import org.onosproject.north.aaa.api.JsonParserService; import org.onosproject.north.aaa.api.ParseException; import org.onosproject.north.aaa.store.User; import java.io.IOException; import java.io.InputStream; import java.util.HashSet; import java.util.Set; import java.util.regex.Pattern; /** * Parse and build user class object from users.json file. */ public class UserParser implements JsonParserService<User> { private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; @Override public Set<User> parseJson(InputStream stream) throws IOException, ParseException { // begin parsing JSON to Application class ObjectMapper mapper = new ObjectMapper(); JsonNode jsonNode = mapper.readTree(stream); JsonParser jp = jsonNode.traverse(); Set<User> userSet = new HashSet<>(); // continue parsing the token till the end of input is reached while (!jp.isClosed()) { // get the token JsonToken token = jp.nextToken(); // if its the last token then we are done if (token == null) { break; } if (JsonToken.FIELD_NAME.equals(token) && "users".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after users"); } while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } if (JsonToken.START_OBJECT.equals(token)) { User user = jsonToUser(jp); userSet.add(user); } } } } return userSet; } private User jsonToUser(JsonParser jp) throws ParseException, IOException { User.Builder builder = User.builder(); while (true) { JsonToken token = jp.nextToken(); if (JsonToken.END_OBJECT.equals(token)) { // bail out break; } if (JsonToken.FIELD_NAME.equals(token) && "username".equals(jp.getCurrentName())) { jp.nextToken(); builder.buildUsername(jp.getText()); } else if (JsonToken.FIELD_NAME.equals(token) && "password".equals(jp.getCurrentName())) { jp.nextToken(); builder.buildPassword(jp.getText()); } else if (JsonToken.FIELD_NAME.equals(token) && "roles".equals(jp.getCurrentName())) { jp.nextToken(); String roles = jp.getText(); if ("admin".equals(roles) || "user".equals(roles)) { builder.buildRoles(roles); } else { // bail out throw new ParseException("roles must be set to either \"admin\" or \"user\""); } } else if (JsonToken.FIELD_NAME.equals(token) && "switches".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after switches"); } Set<String> switches = new HashSet<>(); while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } switches.add(jp.getText()); } builder.buildSwitches(switches); } else if (JsonToken.FIELD_NAME.equals(token) && "domains".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after domains"); } Set<String> domains = new HashSet<>(); while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } domains.add(jp.getText()); } builder.buildDomains(domains); } else if (JsonToken.FIELD_NAME.equals(token) && "scopes".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after scopes"); } Set<String> scopes = new HashSet<>(); while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } scopes.add(jp.getText()); } builder.buildScopes(scopes); } else if (JsonToken.FIELD_NAME.equals(token) && "email".equals(jp.getCurrentName())) { jp.nextToken(); String email = jp.getText(); // verify email by email regex Pattern emailPattern = Pattern.compile(EMAIL_PATTERN); if (!emailPattern.matcher(email).matches()) { // bail out throw new ParseException("email is not valid"); } builder.buildEmail(email); } } return builder.buildAll(); } }