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.ClientCredential; import java.io.IOException; import java.io.InputStream; import java.util.HashSet; import java.util.Set; import java.util.regex.Pattern; /** * Parse and build client credential class object from clients.json file. */ public class ClientParser implements JsonParserService<ClientCredential> { private static final String URI_PATTERN = "^(https?|ftp|file)://[-a-zA-Z0-9+&@#/" + "%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]"; @Override public Set<ClientCredential> parseJson(InputStream stream) throws IOException, ParseException { ObjectMapper mapper = new ObjectMapper(); JsonNode jsonNode = mapper.readTree(stream); JsonParser jp = jsonNode.traverse(); Set<ClientCredential> clientSet = 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) && "clients".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after clients"); } while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } if (JsonToken.START_OBJECT.equals(token)) { ClientCredential client = jsonToClientCredential(jp); clientSet.add(client); } } } } return clientSet; } public ClientCredential jsonToClientCredential(JsonParser jp) throws ParseException, IOException { ClientCredential.Builder builder = ClientCredential.builder(); while (true) { JsonToken token = jp.nextToken(); if (JsonToken.END_OBJECT.equals(token)) { // bail out break; } if (JsonToken.FIELD_NAME.equals(token) && "appId".equals(jp.getCurrentName())) { jp.nextToken(); builder.buildAppId(jp.getText()); } else if (JsonToken.FIELD_NAME.equals(token) && "grants".equals(jp.getCurrentName())) { token = jp.nextToken(); if (!JsonToken.START_ARRAY.equals(token)) { // bail out throw new ParseException("expected ARRAY after grants"); } Set<String> grants = new HashSet<>(); while (true) { token = jp.nextToken(); if (JsonToken.END_ARRAY.equals(token)) { // bail out break; } grants.add(jp.getText()); } builder.buildGrants(grants); } 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) && "redirectUri".equals(jp.getCurrentName())) { jp.nextToken(); String uri = jp.getText(); // verify uri by uri regex Pattern emailPattern = Pattern.compile(URI_PATTERN); if (!emailPattern.matcher(uri).matches()) { // bail out throw new ParseException("uri is not valid"); } builder.buildRedirectUri(uri); } else if (JsonToken.FIELD_NAME.equals(token) && "clientId".equals(jp.getCurrentName())) { jp.nextToken(); builder.buildClientId(jp.getText()); } else if (JsonToken.FIELD_NAME.equals(token) && "clientSecret".equals(jp.getCurrentName())) { jp.nextToken(); builder.buildClientSecret(jp.getText()); } } return builder.buildAll(); } }