Special characters such as (“ ”,') gets converted into ? while applying interceptor in retrofit2.While getting response from retrofit2 , i am getting special characters but the interceptor changes the special character to ? and displays ? instead of special characters
Adding retrofit in Interceptor:
CustomRequestInterceptor requestInterceptor = newCustomRequestInterceptor();
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(BuildConfig.DEBUG ? HttpLoggingInterceptor.Level.BODY :
HttpLoggingInterceptor.Level.NONE);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(requestInterceptor);
httpClient.addInterceptor(logging);
Interceptor class(CustomRequestInterceptor.java) for retrofit2:
public class CustomRequestInterceptor implements Interceptor {
private static String newToken;
private String bodyString;
private final String TAG = getClass().getSimpleName();
@Override
public Response intercept(Chain chain) throws IOException {
String token = "";
Request request = chain.request();
RequestBody oldBody = request.body();
Buffer buffer = new Buffer();
oldBody.writeTo(buffer);
String strOldBody = buffer.readUtf8();
Log.i(TAG, "original req " + strOldBody);
MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");
JSONObject jsonObject = new JSONObject();
String decodedStr = decoder(strOldBody.replace("data=", ""));
try {
if (decodedStr != null && decodedStr.equalsIgnoreCase("")) {
token = getRandomNumber();
jsonObject.put("auth_token", token);
} else {
jsonObject = new JSONObject(decodedStr);
token = getRandomNumber();
jsonObject.put("auth_token", token);
}
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
}
Log.i(AppConstants.TAG, "Request JSONObject " + jsonObject.toString());
String strNewBody = "data=" + URLEncoder.encode(Encryption.encryptString(jsonObject.toString()));
Log.i(TAG, "strNewBody " + strNewBody);
RequestBody body = RequestBody.create(mediaType, strNewBody);
Log.i(TAG, "content type is " + body.contentType().toString());
Log.i(TAG, "content length is " + String.valueOf(body.contentLength()));
Log.i(TAG, "method is " + request.method());
request = request.newBuilder().header("Content-Type", body.contentType().toString())
.header("Content-Length", String.valueOf(body.contentLength()))
.method(request.method(), body).build();
Response response = chain.proceed(request);
String responseString = new String(response.body().bytes());
Log.i(TAG, "Response: " + responseString);
String newResponseString = Encryption.decryptString(responseString);
Log.i(TAG, "Response edited: " + URLDecoder.decode(newResponseString));
JSONObject res_JsonObject = new JSONObject();
if (newResponseString.startsWith("{")) {
try {
res_JsonObject = new JSONObject(newResponseString);
String response_token = res_JsonObject.getString("auth_token");
if (response_token.equalsIgnoreCase("" + token)) {
} else {
res_JsonObject.put("status", false);
res_JsonObject.put("message", "Authentication Failed");
Toast.makeText(new AppController().getApplicationContext(), "Authentication Failed", Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
}
}
byte[] ptext = res_JsonObject.toString().getBytes(ISO_8859_1);
String value = new String(ptext, UTF_16);
return response.newBuilder()
.body(ResponseBody.create(response.body().contentType(), value))
.build();
}
public String decoder(String encodedStr) {
try {
return URLDecoder.decode(encodedStr);
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
return encodedStr;
}
}
}
Expected output:
{
"comment": "“hello”"
}
Actual output:
{
"comment": "?hello?"
}
The problem is in the return statement of intercept method, when we call ResponseBody.create(), the responsebody class converts data to UTF-8 format and UTF-8 does not support characters like (“,”) so it gives us "?" sign because we have given response.body().contentType(), so it converts to UTF-8 which is default. The solution is to not to pass response.body().contentType() to create() and give our own contentType. Here is the updated class.
public class CustomRequestInterceptor implements Interceptor {
private static String newToken;
private String bodyString;
private final String TAG = getClass().getSimpleName();
@Override
public Response intercept(Chain chain) throws IOException {
String token = "";
Request request = chain.request();
RequestBody oldBody = request.body();
Buffer buffer = new Buffer();
oldBody.writeTo(buffer);
String strOldBody = buffer.readUtf8();
Log.i(TAG, "original req " + strOldBody);
MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded");
JSONObject jsonObject = new JSONObject();
String decodedStr = decoder(strOldBody.replace("data=", ""));
try {
if (decodedStr != null && decodedStr.equalsIgnoreCase("")) {
token = getRandomNumber();
jsonObject.put("auth_token", token);
} else {
jsonObject = new JSONObject(decodedStr);
token = getRandomNumber();
jsonObject.put("auth_token", token);
}
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
}
Log.i(AppConstants.TAG, "Request JSONObject " + jsonObject.toString());
String strNewBody = "data=" + URLEncoder.encode(Encryption.encryptString(jsonObject.toString()));
Log.i(TAG, "strNewBody " + strNewBody);
RequestBody body = RequestBody.create(mediaType, strNewBody);
Log.i(TAG, "content type is " + body.contentType().toString());
Log.i(TAG, "content length is " + String.valueOf(body.contentLength()));
Log.i(TAG, "method is " + request.method());
request = request.newBuilder().header("Content-Type", body.contentType().toString())
.header("Content-Length", String.valueOf(body.contentLength()))
.method(request.method(), body).build();
Response response = chain.proceed(request);
String responseString = new String(response.body().bytes());
Log.i(TAG, "Response: " + responseString);
String newResponseString = Encryption.decryptString(responseString);
JSONObject res_JsonObject = new JSONObject();
if (newResponseString.startsWith("{")) {
try {
res_JsonObject = new JSONObject(newResponseString);
String response_token = res_JsonObject.getString("auth_token");
if (response_token.equalsIgnoreCase("" + token)) {
} else {
res_JsonObject.put("status", false);
res_JsonObject.put("message", "Authentication Failed");
Toast.makeText(new AppController().getApplicationContext(), "Authentication Failed", Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
}
}
MediaType contentType = MediaType.parse(response.body().contentType() + "; charset=utf-32");
return response.newBuilder()
.body(ResponseBody.create(contentType, newResponseString.getBytes()))
.build();
}
public String decoder(String encodedStr) {
try {
return URLDecoder.decode(encodedStr);
} catch (Exception e) {
Log.e(AppConstants.TAG, "Exception", e);
return encodedStr;
}
}
}