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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.shelly.internal.api;
  14
  15 import static org.openhab.binding.shelly.internal.ShellyBindingConstants.SHELLY_API_TIMEOUT_MS;
  16 import static org.openhab.binding.shelly.internal.api1.Shelly1ApiJsonDTO.*;
  17 import static org.openhab.binding.shelly.internal.api2.Shelly2ApiJsonDTO.*;
  18 import static org.openhab.binding.shelly.internal.util.ShellyUtils.*;
  19
  20 import java.nio.charset.StandardCharsets;
  21 import java.text.MessageFormat;
  22 import java.util.Base64;
  23 import java.util.Map;
  24 import java.util.concurrent.ExecutionException;
  25 import java.util.concurrent.TimeUnit;
  26 import java.util.concurrent.TimeoutException;
  27
  28 import javax.ws.rs.core.HttpHeaders;
  29
  30 import org.eclipse.jdt.annotation.NonNullByDefault;
  31 import org.eclipse.jdt.annotation.Nullable;
  32 import org.eclipse.jetty.client.HttpClient;
  33 import org.eclipse.jetty.client.api.ContentResponse;
  34 import org.eclipse.jetty.client.api.Request;
  35 import org.eclipse.jetty.client.util.StringContentProvider;
  36 import org.eclipse.jetty.http.HttpFields;
  37 import org.eclipse.jetty.http.HttpHeader;
  38 import org.eclipse.jetty.http.HttpMethod;
  39 import org.eclipse.jetty.http.HttpStatus;
  40 import org.openhab.binding.shelly.internal.api2.Shelly2ApiJsonDTO.Shelly2AuthChallenge;
  41 import org.openhab.binding.shelly.internal.api2.Shelly2ApiJsonDTO.Shelly2AuthRsp;
  42 import org.openhab.binding.shelly.internal.api2.Shelly2ApiJsonDTO.Shelly2RpcBaseMessage;
  43 import org.openhab.binding.shelly.internal.config.ShellyThingConfiguration;
  44 import org.openhab.binding.shelly.internal.handler.ShellyThingInterface;
  45 import org.slf4j.Logger;
  46 import org.slf4j.LoggerFactory;
  47
  48 import com.google.gson.Gson;
  49
  50 /**
  51  * {@link ShellyHttpClient} implements basic HTTP access
  52  *
  53  * @author Markus Michels - Initial contribution
  54  */
  55 @NonNullByDefault
  56 public class ShellyHttpClient {
  57     private final Logger logger = LoggerFactory.getLogger(ShellyHttpClient.class);
  58
  59     public static final String HTTP_HEADER_AUTH = HttpHeaders.AUTHORIZATION;
  60     public static final String HTTP_AUTH_TYPE_BASIC = "Basic";
  61     public static final String HTTP_AUTH_TYPE_DIGEST = "Digest";
  62     public static final String CONTENT_TYPE_JSON = "application/json; charset=UTF-8";
  63     public static final String CONTENT_TYPE_FORM_URLENC = "application/x-www-form-urlencoded";
  64
  65     protected final HttpClient httpClient;
  66     protected ShellyThingConfiguration config = new ShellyThingConfiguration();
  67     protected String thingName;
  68     protected final Gson gson = new Gson();
  69     protected int timeoutErrors = 0;
  70     protected int timeoutsRecovered = 0;
  71     private ShellyDeviceProfile profile;
  72
  73     public ShellyHttpClient(String thingName, ShellyThingInterface thing) {
  74         this(thingName, thing.getThingConfig(), thing.getHttpClient());
  75         this.profile = thing.getProfile();
  76     }
  77
  78     public ShellyHttpClient(String thingName, ShellyThingConfiguration config, HttpClient httpClient) {
  79         profile = new ShellyDeviceProfile();
  80         this.thingName = thingName;
  81         setConfig(thingName, config);
  82         this.httpClient = httpClient;
  83         this.httpClient.setConnectTimeout(SHELLY_API_TIMEOUT_MS);
  84     }
  85
  86     public void initialize() throws ShellyApiException {
  87     }
  88
  89     public void setConfig(String thingName, ShellyThingConfiguration config) {
  90         this.thingName = thingName;
  91         this.config = config;
  92     }
  93
  94     /**
  95      * Submit GET request and return response, check for invalid responses
  96      *
  97      * @param uri: URI (e.g. "/settings")
  98      */
  99     public <T> T callApi(String uri, Class<T> classOfT) throws ShellyApiException {
 100         String json = httpRequest(uri);
 101         return fromJson(gson, json, classOfT);
 102     }
 103
 104     public <T> T postApi(String uri, String data, Class<T> classOfT) throws ShellyApiException {
 105         String json = httpPost(uri, data);
 106         return fromJson(gson, json, classOfT);
 107     }
 108
 109     protected String httpRequest(String uri) throws ShellyApiException {
 110         ShellyApiResult apiResult = new ShellyApiResult();
 111         int retries = 3;
 112         boolean timeout = false;
 113         while (retries > 0) {
 114             try {
 115                 apiResult = innerRequest(HttpMethod.GET, uri, null, "");
 116
 117                 // If call doesn't throw an exception the device is reachable == no timeout
 118                 if (timeout) {
 119                     logger.debug("{}: API timeout #{}/{} recovered ({})", thingName, timeoutErrors, timeoutsRecovered,
 120                             apiResult.getUrl());
 121                     timeoutsRecovered++;
 122                 }
 123                 return apiResult.response; // successful
 124             } catch (ShellyApiException e) {
 125                 if (e.isConnectionError()
 126                         || (!e.isTimeout() && !apiResult.isHttpServerError()) && !apiResult.isNotFound()
 127                         || profile.hasBattery || (retries == 0)) {
 128                     // Sensor in sleep mode or API exception for non-battery device or retry counter expired
 129                     throw e; // non-timeout exception
 130                 }
 131
 132                 timeout = true;
 133                 timeoutErrors++; // count the retries
 134                 logger.debug("{}: API Timeout, retry #{} ({})", thingName, timeoutErrors, e.toString());
 135
 136                 retries--;
 137             }
 138         }
 139         throw new ShellyApiException("API Timeout or inconsistent result"); // successful
 140     }
 141
 142     public String httpPost(String uri, String data) throws ShellyApiException {
 143         return innerRequest(HttpMethod.POST, uri, null, data).response;
 144     }
 145
 146     public String httpPost(@Nullable Shelly2AuthChallenge auth, String data) throws ShellyApiException {
 147         return innerRequest(HttpMethod.POST, SHELLYRPC_ENDPOINT, auth, data).response;
 148     }
 149
 150     private ShellyApiResult innerRequest(HttpMethod method, String uri, @Nullable Shelly2AuthChallenge auth,
 151             String data) throws ShellyApiException {
 152         Request request = null;
 153         String url = "http://" + config.deviceIp + uri;
 154         ShellyApiResult apiResult = new ShellyApiResult(method.toString(), url);
 155
 156         try {
 157             request = httpClient.newRequest(url).method(method.toString()).timeout(SHELLY_API_TIMEOUT_MS,
 158                     TimeUnit.MILLISECONDS);
 159
 160             if (!uri.equals(SHELLY_URL_DEVINFO) && !config.password.isEmpty()) { // not for /shelly or no password
 161                                                                                  // configured
 162                 // Add Auth info
 163                 // Gen 1: Basic Auth
 164                 // Gen 2: Digest Auth
 165                 String authHeader = "";
 166                 if (auth != null) { // only if we received an Auth challenge
 167                     authHeader = formatAuthResponse(uri,
 168                             buildAuthResponse(uri, auth, SHELLY2_AUTHDEF_USER, config.password));
 169                 } else {
 170                     if (!uri.equals(SHELLYRPC_ENDPOINT)) {
 171                         String bearer = config.userId + ":" + config.password;
 172                         authHeader = HTTP_AUTH_TYPE_BASIC + " " + Base64.getEncoder().encodeToString(bearer.getBytes());
 173                     }
 174                 }
 175                 if (!authHeader.isEmpty()) {
 176                     request.header(HTTP_HEADER_AUTH, authHeader);
 177                 }
 178             }
 179             fillPostData(request, data);
 180             logger.trace("{}: HTTP {} {}\n{}\n{}", thingName, method, url, request.getHeaders(), data);
 181
 182             // Do request and get response
 183             ContentResponse contentResponse = request.send();
 184             apiResult = new ShellyApiResult(contentResponse);
 185             apiResult.httpCode = contentResponse.getStatus();
 186             String response = contentResponse.getContentAsString().replace("\t", "").replace("\r\n", "").trim();
 187             logger.trace("{}: HTTP Response {}: {}\n{}", thingName, contentResponse.getStatus(), response,
 188                     contentResponse.getHeaders());
 189
 190             if (response.contains("\"error\":{")) { // Gen2
 191                 Shelly2RpcBaseMessage message = gson.fromJson(response, Shelly2RpcBaseMessage.class);
 192                 if (message != null && message.error != null) {
 193                     apiResult.httpCode = message.error.code;
 194                     apiResult.response = message.error.message;
 195                     if (getInteger(message.error.code) == HttpStatus.UNAUTHORIZED_401) {
 196                         apiResult.authChallenge = getString(message.error.message).replaceAll("\\\"", "\"");
 197                     }
 198                 }
 199             }
 200             HttpFields headers = contentResponse.getHeaders();
 201             String authChallenge = headers.get(HttpHeader.WWW_AUTHENTICATE);
 202             if (!getString(authChallenge).isEmpty()) {
 203                 apiResult.authChallenge = authChallenge;
 204             }
 205
 206             // validate response, API errors are reported as Json
 207             if (apiResult.httpCode != HttpStatus.OK_200) {
 208                 throw new ShellyApiException(apiResult);
 209             }
 210
 211             if (response.isEmpty() || !response.startsWith("{") && !response.startsWith("[") && !url.contains("/debug/")
 212                     && !url.contains("/sta_cache_reset")) {
 213                 throw new ShellyApiException("Unexpected response: " + response);
 214             }
 215         } catch (ExecutionException | InterruptedException | TimeoutException | IllegalArgumentException e) {
 216             ShellyApiException ex = new ShellyApiException(apiResult, e);
 217             if (!ex.isConnectionError() && !ex.isTimeout()) { // will be handled by the caller
 218                 logger.trace("{}: API call returned exception", thingName, ex);
 219             }
 220             throw ex;
 221         }
 222         return apiResult;
 223     }
 224
 225     protected @Nullable Shelly2AuthRsp buildAuthResponse(String uri, @Nullable Shelly2AuthChallenge challenge,
 226             String user, String password) throws ShellyApiException {
 227         if (challenge == null) {
 228             return null; // not required
 229         }
 230         if (!SHELLY2_AUTHTTYPE_DIGEST.equalsIgnoreCase(challenge.authType)
 231                 || !SHELLY2_AUTHALG_SHA256.equalsIgnoreCase(challenge.algorithm)) {
 232             throw new IllegalArgumentException("Unsupported Auth type/algorithm requested by device");
 233         }
 234         Shelly2AuthRsp response = new Shelly2AuthRsp();
 235         response.username = user;
 236         response.realm = challenge.realm;
 237         response.nonce = challenge.nonce;
 238         response.cnonce = Long.toHexString((long) Math.floor(Math.random() * 10e8));
 239         response.nc = "00000001";
 240         response.authType = challenge.authType;
 241         response.algorithm = challenge.algorithm;
 242         String ha1 = sha256(response.username + ":" + response.realm + ":" + password);
 243         String ha2 = sha256(HttpMethod.POST + ":" + uri);// SHELLY2_AUTH_NOISE;
 244         response.response = sha256(
 245                 ha1 + ":" + response.nonce + ":" + response.nc + ":" + response.cnonce + ":" + "auth" + ":" + ha2);
 246         return response;
 247     }
 248
 249     protected String formatAuthResponse(String uri, @Nullable Shelly2AuthRsp rsp) {
 250         return rsp != null ? MessageFormat.format(HTTP_AUTH_TYPE_DIGEST
 251                 + " username=\"{0}\", realm=\"{1}\", uri=\"{2}\", nonce=\"{3}\", cnonce=\"{4}\", nc=\"{5}\", qop=\"auth\",response=\"{6}\", algorithm=\"{7}\", ",
 252                 rsp.username, rsp.realm, uri, rsp.nonce, rsp.cnonce, rsp.nc, rsp.response, rsp.algorithm) : "";
 253     }
 254
 255     /**
 256      * Fill in POST data, set http headers
 257      *
 258      * @param request HTTP request structure
 259      * @param data POST data, might be empty
 260      */
 261     private void fillPostData(Request request, String data) {
 262         boolean json = data.startsWith("{") || data.contains("\": {");
 263         String type = json ? CONTENT_TYPE_JSON : CONTENT_TYPE_FORM_URLENC;
 264         request.header(HttpHeader.CONTENT_TYPE, type);
 265         if (!data.isEmpty()) {
 266             StringContentProvider postData;
 267             postData = new StringContentProvider(type, data, StandardCharsets.UTF_8);
 268             request.content(postData);
 269             // request.header(HttpHeader.CONTENT_LENGTH, Long.toString(postData.getLength()));
 270         }
 271     }
 272
 273     /**
 274      * Format POST body depending on content type (JSON or form encoded)
 275      *
 276      * @param dataMap Field list
 277      * @param json true=JSON format, false=form encoded
 278      * @return formatted body
 279      */
 280     public static String buildPostData(Map<String, String> dataMap, boolean json) {
 281         String data = "";
 282         for (Map.Entry<String, String> e : dataMap.entrySet()) {
 283             data = data + (data.isEmpty() ? "" : json ? ", " : "&");
 284             if (!json) {
 285                 data = data + e.getKey() + "=" + e.getValue();
 286             } else {
 287                 data = data + "\"" + e.getKey() + "\" : \"" + e.getValue() + "\"";
 288             }
 289         }
 290         return json ? "{ " + data + " }" : data;
 291     }
 292
 293     public String getControlUriPrefix(Integer id) {
 294         String uri = "";
 295         if (profile.isLight || profile.isDimmer) {
 296             if (profile.isDuo || profile.isDimmer) {
 297                 // Duo + Dimmer
 298                 uri = SHELLY_URL_CONTROL_LIGHT;
 299             } else {
 300                 // Bulb + RGBW2
 301                 uri = "/" + (profile.inColor ? SHELLY_MODE_COLOR : SHELLY_MODE_WHITE);
 302             }
 303         } else {
 304             // Roller, Relay
 305             uri = SHELLY_URL_CONTROL_RELEAY;
 306         }
 307         uri = uri + "/" + id;
 308         return uri;
 309     }
 310
 311     public int getTimeoutErrors() {
 312         return timeoutErrors;
 313     }
 314
 315     public int getTimeoutsRecovered() {
 316         return timeoutsRecovered;
 317     }
 318
 319     public void postEvent(String device, String index, String event, Map<String, String> parms)
 320             throws ShellyApiException {
 321     }
 322 }