Wordpress identity store (#67)

src/main/java/io/kamax/mxisd/auth/provider/BackendAuthResult.java

@@ -66,7 +66,6 @@ public class BackendAuthResult {
     public void succeed(String id, String type, String displayName) {
         this.success = true;
         this.id = new UserID(type, id);
-        this.profile = new BackendAuthProfile();
         this.profile.displayName = displayName;
     }
 

src/main/java/io/kamax/mxisd/backend/wordpress/WordpressAuthData.java

@@ -0,0 +1,62 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+public class WordpressAuthData {
+
+    public String token;
+    private String userEmail;
+    private String userNicename;
+    private String userDisplayName;
+
+    public String getToken() {
+        return token;
+    }
+
+    public void setToken(String token) {
+        this.token = token;
+    }
+
+    public String getUserEmail() {
+        return userEmail;
+    }
+
+    public void setUserEmail(String userEmail) {
+        this.userEmail = userEmail;
+    }
+
+    public String getUserNicename() {
+        return userNicename;
+    }
+
+    public void setUserNicename(String userNicename) {
+        this.userNicename = userNicename;
+    }
+
+    public String getUserDisplayName() {
+        return userDisplayName;
+    }
+
+    public void setUserDisplayName(String userDisplayName) {
+        this.userDisplayName = userDisplayName;
+    }
+
+}

src/main/java/io/kamax/mxisd/backend/wordpress/WordpressAuthProvider.java

@@ -0,0 +1,68 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+import io.kamax.matrix._MatrixID;
+import io.kamax.mxisd.ThreePid;
+import io.kamax.mxisd.UserIdType;
+import io.kamax.mxisd.auth.provider.AuthenticatorProvider;
+import io.kamax.mxisd.auth.provider.BackendAuthResult;
+import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class WordpressAuthProvider implements AuthenticatorProvider {
+
+    private final Logger log = LoggerFactory.getLogger(WordpressAuthProvider.class);
+
+    private WordpressRestBackend wordpress;
+
+    @Autowired
+    public WordpressAuthProvider(WordpressRestBackend wordpress) {
+        this.wordpress = wordpress;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return wordpress.isEnabled();
+    }
+
+    @Override
+    public BackendAuthResult authenticate(_MatrixID mxid, String password) {
+        try {
+            WordpressAuthData data = wordpress.authenticate(mxid.getLocalPart(), password);
+            BackendAuthResult result = new BackendAuthResult();
+            if (StringUtils.isNotBlank(data.getUserEmail())) {
+                result.withThreePid(new ThreePid("email", data.getUserEmail()));
+            }
+            result.succeed(mxid.getId(), UserIdType.MatrixID.getId(), data.getUserDisplayName());
+            return result;
+        } catch (IllegalArgumentException e) {
+            log.error("Authentication failed for {}: {}", mxid.getId(), e.getMessage());
+            return BackendAuthResult.failure();
+        }
+
+    }
+
+}

src/main/java/io/kamax/mxisd/backend/wordpress/WordpressDirectoryProvider.java

@@ -0,0 +1,112 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+import io.kamax.matrix.MatrixID;
+import io.kamax.mxisd.config.MatrixConfig;
+import io.kamax.mxisd.config.wordpress.WordpressConfig;
+import io.kamax.mxisd.controller.directory.v1.io.UserDirectorySearchResult;
+import io.kamax.mxisd.directory.IDirectoryProvider;
+import io.kamax.mxisd.exception.InternalServerError;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Optional;
+
+@Component
+public class WordpressDirectoryProvider implements IDirectoryProvider {
+
+    private final Logger log = LoggerFactory.getLogger(WordpressDirectoryProvider.class);
+
+    private WordpressConfig cfg;
+    private WordressSqlBackend wordpress;
+    private MatrixConfig mxCfg;
+
+    @Autowired
+    public WordpressDirectoryProvider(WordpressConfig cfg, WordressSqlBackend wordpress, MatrixConfig mxCfg) {
+        this.cfg = cfg;
+        this.wordpress = wordpress;
+        this.mxCfg = mxCfg;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return wordpress.isEnabled();
+    }
+
+    protected void setParameters(PreparedStatement stmt, String searchTerm) throws SQLException {
+        for (int i = 1; i <= stmt.getParameterMetaData().getParameterCount(); i++) {
+            stmt.setString(i, "%" + searchTerm + "%");
+        }
+    }
+
+    protected Optional<UserDirectorySearchResult.Result> processRow(ResultSet rSet) throws SQLException {
+        UserDirectorySearchResult.Result item = new UserDirectorySearchResult.Result();
+        item.setUserId(rSet.getString(1));
+        item.setDisplayName(rSet.getString(2));
+        return Optional.of(item);
+    }
+
+    public UserDirectorySearchResult search(String searchTerm, String query) {
+        try (Connection conn = wordpress.getConnection()) {
+            log.info("Will execute query: {}", query);
+            try (PreparedStatement stmt = conn.prepareStatement(query)) {
+                setParameters(stmt, searchTerm);
+
+                try (ResultSet rSet = stmt.executeQuery()) {
+                    UserDirectorySearchResult result = new UserDirectorySearchResult();
+                    result.setLimited(false);
+
+                    while (rSet.next()) {
+                        processRow(rSet).ifPresent(e -> {
+                            e.setUserId(MatrixID.from(e.getUserId(), mxCfg.getDomain()).valid().getId());
+                            result.addResult(e);
+                        });
+                    }
+
+                    return result;
+                }
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+            throw new InternalServerError(e);
+        }
+    }
+
+    @Override
+    public UserDirectorySearchResult searchByDisplayName(String searchTerm) {
+        log.info("Searching users by display name using '{}'", searchTerm);
+        return search(searchTerm, cfg.getSql().getQuery().getDirectory().get("name"));
+    }
+
+    @Override
+    public UserDirectorySearchResult searchBy3pid(String searchTerm) {
+        log.info("Searching users by 3PID using '{}'", searchTerm);
+        return search(searchTerm, cfg.getSql().getQuery().getDirectory().get("threepid"));
+    }
+
+}

src/main/java/io/kamax/mxisd/backend/wordpress/WordpressRestBackend.java

@@ -0,0 +1,143 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+import com.google.gson.JsonObject;
+import io.kamax.matrix.json.GsonUtil;
+import io.kamax.matrix.json.InvalidJsonException;
+import io.kamax.mxisd.config.wordpress.WordpressConfig;
+import io.kamax.mxisd.util.RestClientUtils;
+import org.apache.commons.lang.StringUtils;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.methods.HttpRequestBase;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.util.EntityUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+
+@Component
+public class WordpressRestBackend {
+
+    private final Logger log = LoggerFactory.getLogger(WordpressRestBackend.class);
+    private final String jsonPath = "/wp-json";
+    private final String jwtPath = "/jwt-auth/v1";
+
+    private WordpressConfig cfg;
+    private CloseableHttpClient client;
+
+    private String jsonEndpoint;
+    private String jwtEndpoint;
+
+    private String token;
+
+    @Autowired
+    public WordpressRestBackend(WordpressConfig cfg, CloseableHttpClient client) {
+        this.cfg = cfg;
+        this.client = client;
+
+        if (!cfg.isEnabled()) {
+            return;
+        }
+
+        jsonEndpoint = cfg.getRest().getBase() + jsonPath;
+        jwtEndpoint = jsonEndpoint + jwtPath;
+        validateConfig();
+    }
+
+    private void validateConfig() {
+        log.info("Validating JWT auth endpoint");
+        try (CloseableHttpResponse res = client.execute(new HttpGet(jwtEndpoint))) {
+            int status = res.getStatusLine().getStatusCode();
+            if (status != 200) {
+                log.warn("JWT auth endpoint check failed: Got status code {}", status);
+                return;
+            }
+
+            String data = EntityUtils.toString(res.getEntity());
+            if (StringUtils.isBlank(data)) {
+                log.warn("JWT auth endpoint check failed: Got no/empty body data");
+            }
+
+            JsonObject body = GsonUtil.parseObj(data);
+            if (!body.has("namespace")) {
+                log.warn("JWT auth endpoint check failed: invalid namespace");
+            }
+
+            log.info("JWT auth endpoint check succeeded");
+        } catch (InvalidJsonException e) {
+            log.warn("JWT auth endpoint check failed: Invalid JSON response: {}", e.getMessage());
+        } catch (IOException e) {
+            log.warn("JWT auth endpoint check failed: Could not read API endpoint: {}", e.getMessage());
+        }
+    }
+
+    public boolean isEnabled() {
+        return cfg.isEnabled();
+    }
+
+    protected WordpressAuthData authenticate(String username, String password) {
+        JsonObject body = new JsonObject();
+        body.addProperty("username", username);
+        body.addProperty("password", password);
+        HttpPost req = RestClientUtils.post(jwtEndpoint + "/token", body);
+        try (CloseableHttpResponse res = client.execute(req)) {
+            int status = res.getStatusLine().getStatusCode();
+            String bodyRes = EntityUtils.toString(res.getEntity());
+            if (status != 200) {
+                throw new IllegalArgumentException(bodyRes);
+            }
+
+            return GsonUtil.get().fromJson(bodyRes, WordpressAuthData.class);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    protected void authenticate() {
+        WordpressAuthData data = authenticate(
+                cfg.getRest().getCredential().getUsername(),
+                cfg.getRest().getCredential().getPassword());
+        log.info("Internal authentication: success, logged in as " + data.getUserNicename());
+        token = data.getToken();
+    }
+
+    protected CloseableHttpResponse runRequest(HttpRequestBase request) throws IOException {
+        request.setHeader("Authorization", "Bearer " + token);
+        return client.execute(request);
+    }
+
+    public CloseableHttpResponse withAuthentication(HttpRequestBase request) throws IOException {
+        CloseableHttpResponse response = runRequest(request);
+        if (response.getStatusLine().getStatusCode() == 403) { //FIXME we should check the JWT expiration time
+            authenticate();
+            response = runRequest(request);
+        }
+
+        return response;
+    }
+
+}

src/main/java/io/kamax/mxisd/backend/wordpress/WordpressThreePidProvider.java

@@ -0,0 +1,114 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+import io.kamax.matrix.MatrixID;
+import io.kamax.matrix._MatrixID;
+import io.kamax.mxisd.ThreePid;
+import io.kamax.mxisd.config.MatrixConfig;
+import io.kamax.mxisd.config.wordpress.WordpressConfig;
+import io.kamax.mxisd.lookup.SingleLookupReply;
+import io.kamax.mxisd.lookup.SingleLookupRequest;
+import io.kamax.mxisd.lookup.ThreePidMapping;
+import io.kamax.mxisd.lookup.provider.IThreePidProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+@Component
+public class WordpressThreePidProvider implements IThreePidProvider {
+
+    private final Logger log = LoggerFactory.getLogger(WordpressThreePidProvider.class);
+
+    private MatrixConfig mxCfg;
+    private WordpressConfig cfg;
+    private WordressSqlBackend wordpress;
+
+    @Autowired
+    public WordpressThreePidProvider(MatrixConfig mxCfg, WordpressConfig cfg, WordressSqlBackend wordpress) {
+        this.mxCfg = mxCfg;
+        this.cfg = cfg;
+        this.wordpress = wordpress;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return wordpress.isEnabled();
+    }
+
+    @Override
+    public boolean isLocal() {
+        return true;
+    }
+
+    @Override
+    public int getPriority() {
+        return 15;
+    }
+
+    protected Optional<_MatrixID> find(ThreePid tpid) {
+        String query = cfg.getSql().getQuery().getThreepid().get(tpid.getMedium());
+        if (Objects.isNull(query)) {
+            return Optional.empty();
+        }
+
+        try (Connection conn = wordpress.getConnection()) {
+            PreparedStatement stmt = conn.prepareStatement(query);
+            stmt.setString(1, tpid.getAddress());
+
+            try (ResultSet rSet = stmt.executeQuery()) {
+                while (rSet.next()) {
+                    String uid = rSet.getString("uid");
+                    log.info("Found match: {}", uid);
+                    return Optional.of(MatrixID.from(uid, mxCfg.getDomain()).valid());
+                }
+
+                log.info("No match found in Wordpress");
+                return Optional.empty();
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public Optional<SingleLookupReply> find(SingleLookupRequest request) {
+        return find(new ThreePid(request.getType(), request.getThreePid())).map(mxid -> new SingleLookupReply(request, mxid));
+    }
+
+    @Override
+    public List<ThreePidMapping> populate(List<ThreePidMapping> mappings) {
+        for (ThreePidMapping tpidMap : mappings) {
+            find(new ThreePid(tpidMap.getMedium(), tpidMap.getValue())).ifPresent(mxid -> tpidMap.setMxid(mxid.getId()));
+        }
+        return mappings;
+    }
+
+}

src/main/java/io/kamax/mxisd/backend/wordpress/WordressSqlBackend.java

@@ -0,0 +1,61 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.backend.wordpress;
+
+import com.mchange.v2.c3p0.ComboPooledDataSource;
+import io.kamax.mxisd.config.wordpress.WordpressConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+@Component
+public class WordressSqlBackend {
+
+    private Logger log = LoggerFactory.getLogger(WordressSqlBackend.class);
+
+    private WordpressConfig cfg;
+
+    private ComboPooledDataSource ds;
+
+    @Autowired
+    public WordressSqlBackend(WordpressConfig cfg) {
+        this.cfg = cfg;
+
+        ds = new ComboPooledDataSource();
+        ds.setJdbcUrl("jdbc:" + cfg.getSql().getType() + ":" + cfg.getSql().getConnection());
+        ds.setMinPoolSize(1);
+        ds.setMaxPoolSize(10);
+        ds.setAcquireIncrement(2);
+    }
+
+    public boolean isEnabled() {
+        return cfg.isEnabled();
+    }
+
+    public Connection getConnection() throws SQLException {
+        return ds.getConnection();
+    }
+
+}

src/main/java/io/kamax/mxisd/config/wordpress/WordpressConfig.java

@@ -0,0 +1,175 @@
+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2018 Kamax Sàrl
+ *
+ * https://www.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.config.wordpress;
+
+import io.kamax.mxisd.exception.ConfigurationException;
+import org.apache.commons.lang.StringUtils;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+import javax.annotation.PostConstruct;
+import java.util.Map;
+
+@Configuration
+@ConfigurationProperties("wordpress")
+public class WordpressConfig {
+
+    public static class Credential {
+
+        private String username;
+        private String password;
+
+        public String getUsername() {
+            return username;
+        }
+
+        public void setUsername(String username) {
+            this.username = username;
+        }
+
+        public String getPassword() {
+            return password;
+        }
+
+        public void setPassword(String password) {
+            this.password = password;
+        }
+
+    }
+
+    public static class Rest {
+
+        private Credential credential = new Credential();
+        private String base;
+
+        public String getBase() {
+            return base;
+        }
+
+        public void setBase(String base) {
+            this.base = base;
+        }
+
+        public Credential getCredential() {
+            return credential;
+        }
+
+        public void setCredential(Credential credential) {
+            this.credential = credential;
+        }
+
+    }
+
+    public static class Query {
+
+        private Map<String, String> threepid;
+        private Map<String, String> directory;
+
+        public Map<String, String> getThreepid() {
+            return threepid;
+        }
+
+        public void setThreepid(Map<String, String> threepid) {
+            this.threepid = threepid;
+        }
+
+        public Map<String, String> getDirectory() {
+            return directory;
+        }
+
+        public void setDirectory(Map<String, String> directory) {
+            this.directory = directory;
+        }
+
+    }
+
+    public static class Sql {
+
+        private String type;
+        private String connection;
+        private Query query;
+
+        public String getType() {
+            return type;
+        }
+
+        public void setType(String type) {
+            this.type = type;
+        }
+
+        public String getConnection() {
+            return connection;
+        }
+
+        public void setConnection(String connection) {
+            this.connection = connection;
+        }
+
+        public Query getQuery() {
+            return query;
+        }
+
+        public void setQuery(Query query) {
+            this.query = query;
+        }
+
+    }
+
+    private boolean enabled;
+    private Rest rest = new Rest();
+    private Sql sql = new Sql();
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    public Rest getRest() {
+        return rest;
+    }
+
+    public void setRest(Rest rest) {
+        this.rest = rest;
+    }
+
+    public Sql getSql() {
+        return sql;
+    }
+
+    public void setSql(Sql sql) {
+        this.sql = sql;
+    }
+
+    @PostConstruct
+    public void build() {
+        if (!isEnabled()) {
+            return;
+        }
+
+        if (StringUtils.isBlank(getRest().getBase())) {
+            throw new ConfigurationException("wordpress.rest.base");
+        }
+    }
+
+}

src/main/java/io/kamax/mxisd/util/RestClientUtils.java

@@ -20,9 +20,7 @@
 
 package io.kamax.mxisd.util;
 
-import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
@@ -31,7 +29,7 @@ import java.nio.charset.StandardCharsets;
 
 public class RestClientUtils {
 
-    private static Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
+    private static Gson gson = GsonUtil.build();
 
     public static HttpPost post(String url, String body) {
         StringEntity entity = new StringEntity(body, StandardCharsets.UTF_8);