Connecting to a db using REST interface: Cannot connect
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26-10-2019 - |
Question
I am trying to connect to a mongodb through mongolabs REST interface in the android app I'm developing, but it is not connecting, and instead it is throwing an exception (or at least i think it is). I am not familiar with backends, so if I am making a fatal rookie's mistake, please forgive me. This is the logcat
01-10 16:28:50.377: W/System.err(630): javax.net.ssl.SSLException: hostname in certificate didn't match: != OR OR >01-10 16:28:50.377: W/System.err(630): at org.apache.http.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:185) 01-10 >16:28:50.388: W/System.err(630): at org.apache.http.conn.ssl.BrowserCompatHostnameVerifier.verify(BrowserCompatHostnameVerifier.java:54)
Below is the part of MongoLabHelper class i wrote to access the database and get items like names
HttpClient client;
JSONObject db;
MongoLabHelper() throws ClientProtocolException, IOException, JSONException{
client = new DefaultHttpClient();
HttpGet request = new HttpGet("https://api.mongolab.com/api/1/databases/breadcrumbs/collections/crumbs?apiKey=xxxxxxxxxxxxx");
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
InputStream in = entity.getContent();
String json = in.toString();
db = new JSONObject(json);
}
public String getName(String name) throws JSONException {
JSONObject doc = db.getJSONObject(name);
return doc.getString("name");
}
and here is part the class it is used in
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String name = "Crumb Not Available";
MongoLabHelper help;
try {
help = new MongoLabHelper();
name = help.getName("Chipotle");
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
setContentView(R.layout.breadcrumb);
TextView crumbName = (TextView) findViewById(R.id.crumb_name);
crumbName.setText(name);
Solution
You actually need to explicitly setup the HttpClient to handle SSL. I believe this stackoverflow thread has the information you need:
I'll copy the relevant bit of code from the thread for convenience:
private HttpClient createHttpClient()
{
HttpParams params = new BasicHttpParams();
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setContentCharset(params, HTTP.DEFAULT_CONTENT_CHARSET);
HttpProtocolParams.setUseExpectContinue(params, true);
SchemeRegistry schReg = new SchemeRegistry();
schReg.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
schReg.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));
ClientConnectionManager conMgr = new ThreadSafeClientConnManager(params, schReg);
return new DefaultHttpClient(conMgr, params);
}
OTHER TIPS
As a helper;
I've also implemented Android library to abstract MongoLab communication.
The main goal is to make an easy to use a library that leverages the power of Mongo in the cloud, directly from Android applications!
Note: I've also included custom ACRA reporter that uses MongoLab.
here is the first version (I'll keep extending):
-> https://github.com/wareninja/mongolab-sdk
You have an example here from an application http://lolapriego.com/blog/?p=16
or you can take a look at this Gist where you can see how to make http request in Android
public class CustomHttpClient {
/** The time it takes for our client to timeout */
public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds
/** Single instance of our HttpClient */
private static HttpClient mHttpClient;
/**
* Get our single instance of our HttpClient object.
*
* @return an HttpClient object with connection parameters set
*/
private static HttpClient getHttpClient() {
if (mHttpClient == null) {
mHttpClient = new DefaultHttpClient();
final HttpParams params = mHttpClient.getParams();
HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
}
return mHttpClient;
}
/**
* Performs an HTTP Post request to the specified url with the
* specified parameters.
*
* @param url The web address to post the request to
* @param postParameters The parameters to send via the request
* @return The result of the request
* @throws Exception
*/
public static String executeHttpPost(String url, JSONObject json) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
request.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF-8")));
request.setHeader( "Content-Type", "application/json");
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP GET request to the specified url.
*
* @param url The web address to post the request to
* @return The result of the request
* @throws Exception
*/
public static String executeHttpGet(String url) throws Exception {
BufferedReader in = null;
String data = null;
try {
HttpClient client = getHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
response.getStatusLine().getStatusCode();
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while ((l = in.readLine()) !=null){
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
} finally{
if (in != null){
try{
in.close();
return data;
}catch (Exception e){
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP DELETE request to the specified url.
*
* @param url The web address to post the request to
* @return The result of the request
* @throws Exception
*/
public static String executeHttpDelete(String url) throws Exception {
BufferedReader in = null;
String data = null;
try {
HttpClient client = getHttpClient();
HttpDelete request = new HttpDelete();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
response.getStatusLine().getStatusCode();
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.separator");
while ((l = in.readLine()) !=null){
sb.append(l + nl);
}
in.close();
data = sb.toString();
return data;
} finally{
if (in != null){
try{
in.close();
return data;
}catch (Exception e){
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP Put request to the specified url with the
* specified parameters.
*
* @param url The web address to post the request to
* @param putParameters The parameters to send via the request
* @return The result of the request
* @throws Exception
*/
public static String executeHttpPut(String url, JSONObject json) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpPut request = new HttpPut(url);
request.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF-8")));
request.setHeader( "Content-Type", "application/json");
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}