com.antonioaltieri.telegram.botapi.requests.TelegramApi Maven / Gradle / Ivy
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package com.antonioaltieri.telegram.botapi.requests;
import com.antonioaltieri.telegram.botapi.requests.ApiException;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
public final class TelegramApi {
public static final String API_URL = "https://api.telegram.org/bot%s/%s";
private final String token;
public TelegramApi(String token) {
this.token = token;
}
private static String createQueryString(Map arguments) throws UnsupportedEncodingException {
StringBuilder stringBuilder = new StringBuilder();
for (Map.Entry entry : arguments.entrySet()) {
stringBuilder.append(URLEncoder.encode(entry.getKey(), "UTF-8"))
.append("=")
.append(URLEncoder.encode(entry.getValue(), "UTF-8"))
.append("&");
}
return stringBuilder.deleteCharAt(stringBuilder.length() - 1).toString();
}
private static String readAll(InputStream input) {
Scanner scanner = new Scanner(input);
scanner.useDelimiter("\\A");
return scanner.hasNext() ? scanner.next() : null;
}
public String makeGetRequest(String method) {
try {
HttpURLConnection connection = buildConnection(method);
connection.setRequestMethod("GET");
connection.setDoInput(true);
return readAll(connection.getInputStream());
} catch (IOException exception) {
throw new ApiException(method, exception);
}
}
public String makePostRequest(String method, Map arguments) {
try {
String query = createQueryString(arguments);
HttpURLConnection connection = buildConnection(method);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-length", String.valueOf(query.length()));
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("User-Agent", "TelegramBots4Java API Agent");
connection.setDoInput(true);
connection.setDoOutput(true);
DataOutputStream output = new DataOutputStream(connection.getOutputStream());
output.write(query.getBytes());
output.close();
return readAll(connection.getInputStream());
} catch (IOException exception) {
throw new ApiException(method, exception);
}
}
public String makeMultipartRequest(String method, Map args, String fieldName, File uploadFile) {
try {
MultipartUtility multipartUtility = new MultipartUtility(buildConnection(method), "UTF-8");
for (Map.Entry entry : args.entrySet())
multipartUtility.addFormField(entry.getKey(), entry.getValue());
multipartUtility.addFilePart(fieldName, uploadFile);
return multipartUtility.finish();
} catch (IOException e) {
throw new ApiException(method, e);
}
}
private HttpURLConnection buildConnection(String methodName) {
try {
HttpURLConnection httpconnection= (HttpURLConnection) new URL(String.format(API_URL, token, methodName)).openConnection();
httpconnection.setConnectTimeout(Integer.MAX_VALUE);
return httpconnection;
} catch (IOException e) {
throw new ApiException(methodName, e);
}
}
private static class MultipartUtility {
private static final String LINE_FEED = "\r\n";
private final String boundary;
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
*
* @param httpURLConnection
* @param charset
* @throws IOException
*/
public MultipartUtility(HttpURLConnection httpURLConnection, String charset)
throws IOException {
this.charset = charset;
// creates a unique boundary based on time stamp
boundary = "===" + System.currentTimeMillis() + "===";
this.httpConn = httpURLConnection;
httpURLConnection.setUseCaches(false);
httpURLConnection.setDoOutput(true); // indicates POST method
httpURLConnection.setDoInput(true);
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
httpURLConnection.setRequestProperty("User-Agent", "TelegramBots4Java API Agent");
httpURLConnection.setRequestProperty("Test", "Bonjour");
outputStream = httpURLConnection.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
/**
* Adds a form field to the request
*
* @param name field name
* @param value field value
*/
public void addFormField(String name, String value) {
writer.append("--" + boundary).append(LINE_FEED);
writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
.append(LINE_FEED);
writer.append("Content-Type: text/plain; charset=" + charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
/**
* Adds a upload file section to the request
*
* @param fieldName name attribute in
* @param uploadFile a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
writer.append("--" + boundary).append(LINE_FEED);
writer.append(
"Content-Disposition: form-data; name=\"" + fieldName
+ "\"; filename=\"" + fileName + "\"")
.append(LINE_FEED);
writer.append(
"Content-Type: "
+ URLConnection.guessContentTypeFromName(fileName))
.append(LINE_FEED);
writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
writer.append(LINE_FEED);
writer.flush();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
/**
* Adds a header field to the request.
*
* @param name - name of the header field
* @param value - value of the header field
*/
public void addHeaderField(String name, String value) {
writer.append(name + ": " + value).append(LINE_FEED);
writer.flush();
}
/**
* Completes the request and receives response from the server.
*
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public String finish() throws IOException {
List response = new ArrayList();
writer.append(LINE_FEED).flush();
writer.append("--" + boundary + "--").append(LINE_FEED);
writer.close();
outputStream.close();
return readAll(httpConn.getInputStream());
}
}
}