Develop Reference

How to use Satang "orders/user" API with java?

I've built java code to use satang "orders/user" api.
But got 405 error.
Please help me.
I've built placeLimitOrder() function.
And used successfully.
Then getUserOrders() function also made with same rult.
But this function got 405 error.
I can't find the reason.
public String getUserOrders (String pair,String limit,String offset,String status,String side)
{
String req="limit="+limit+"&offset="+offset+"&pair="+pair+"&side="+side+"&status="+status;
String operation="orders/user";
String signature=getSignature(req);
URL url = new URL(baseUrl+operation);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setDoOutput( true );
con.setInstanceFollowRedirects( false );
con.setRequestProperty("Authorization", "TDAX-API "+this.key);
con.setRequestProperty("Signature",signature);
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("charset", "utf-8");
con.setRequestProperty("User-Agent", "java client");
con.setUseCaches( false );
JsonObject obj=new JsonObject();
obj.addProperty("limit", limit);
obj.addProperty("offset", offset);
obj.addProperty("pair", pair);
obj.addProperty("side", side);
obj.addProperty("status", status);
String json=obj.toString();
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(json);
wr.flush();
wr.close();
int responseCode=con.getResponseCode();
if(responseCode!=HttpURLConnection.HTTP_OK){
throw new BadResponseException(responseCode);
}
BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder result = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
result.append(line);
}
rd.close();
return result.toString();
}
Following code working well.
I can't find the reason.
public String placeLimitOrder(String amount,String pair,String price,String side) throws IOException, BadResponseException
{
Long lnonce=new Date().getTime();
String nonce=lnonce.toString();
String req="amount="+amount+"&nonce="+nonce+"&pair="+pair+"&price="+price+"&side="+side+"&type=limit";
String operation="orders/";
String signature=getSignature(req);
URL url = new URL(baseUrl+operation);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
con.setDoOutput( true );
con.setInstanceFollowRedirects( false );
con.setRequestProperty("Authorization", "TDAX-API "+this.key);
con.setRequestProperty("Signature",signature);
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("charset", "utf-8");
con.setRequestProperty("User-Agent", "java client");
con.setUseCaches( false );
JsonObject obj=new JsonObject();
obj.addProperty("amount", amount);
obj.addProperty("nonce", nonce);
obj.addProperty("pair", pair);
obj.addProperty("price", price);
obj.addProperty("side", side);
obj.addProperty("type", "limit");
String json=obj.toString();
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(json);
wr.flush();
wr.close();
int responseCode=con.getResponseCode();
if(responseCode!=HttpURLConnection.HTTP_OK){
throw new BadResponseException(responseCode);
}
BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder result = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
result.append(line);
}
rd.close();
return result.toString();
}

public String getUserOrders(String pair,String limit,String offset,String status,String side) throws IOException, BadResponseException
{
String req="limit="+limit+"&offset="+offset+"&pair="+pair+"&side="+side+"&status="+status;
String operation="orders/user?"+req;
String signature=getSignature("");
URL url = new URL(baseUrl+operation);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
con.setDoOutput( true );
con.setInstanceFollowRedirects( false );
con.setRequestProperty("Authorization", "TDAX-API "+this.key);
con.setRequestProperty("Signature",signature);
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("charset", "utf-8");
con.setRequestProperty("User-Agent", "java client");
con.setUseCaches( false );
int responseCode=con.getResponseCode();
if(responseCode!=HttpURLConnection.HTTP_OK){
throw new BadResponseException(responseCode);
}
BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
StringBuilder result = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
result.append(line);
}
rd.close();
return result.toString();
}

So if you are trying to do GET to https://api.tdax.com/api/orders/user
Headers should include:
Signature
Authentication
Query Parameters:
pair
limit
offset
status
side
From your code, it looks like you have put everything to the Signature.
Link to API docs
This is what you should fix:
URL. It should look like:
https://api.tdax.com/api/orders/user?pair=pairValue&limit=limitValue&offset=... add all the parameters and insert values.
Change request method to GET
Double-check your headers (Signature, Authentication).
Error code 405 - "bad request", which means most likely your request URL is bad. After you will fix URL, you should be able to get a different response code like 403/401 which should indicate that something is wrong with signature or authentication. In the best-case scenario, you will get 200 and then try to parse the JSON response.
Also, I don't recommend you to use HttpURLConnection, Generally, it’s NOT recommended to use this class, because the codebase is very old and outdated, it may not supports the new HTTP/2 standard, in fact, it’s really difficult to configure and use this class. Please consider using OkHttp, Apache HttpClient or other libraries.

Sending post using HttpURLConnection

I have a node.js which waits for post with 2 parameters (name and pass):
app.post('/login.html', function (req, res) {
log.info(req.body);
userName = req.body.name;
pass = req.body.pass;
...
}
I'm trying to send post with the 2 parameters via simple java application, but I can't see that it arrive to the node.js.
what am I missing ?
The java code:
public static void main(String[] args) {
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL("http://83.63.118.111:31011/login.html");
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000);
urlConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
urlConnection.setConnectTimeout(10000);
urlConnection.setRequestMethod("POST");
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
OutputStream os = urlConnection.getOutputStream();
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
String str = "name='root'&pass='123456'";
//System.out.print(str);
writer.write(str);
writer.flush();
Thread.sleep(100);
writer.close();
os.close();
}

Your code will close when start send data (send and stop)
You should wait it done.
Add code after writer.flush();
Example get response:
BufferedReader in = new BufferedReader(
new InputStreamReader(urlConnection.getInputStream()));
String inputLine;
StringBuilder response = new StringBuilder();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
or just get responseCode:
int responseCode = urlConnection.getResponseCode();
Your program wait send request success or fail.
I think you use Thread.sleep(100); to wait send request, but it stop your Thread (don't send data to server)
Your code have req.body, Express.js don't have it, need use middleware body-parser.

HttpURLConnection returned different result on Android 5.1 and 4.4 while passing the same params

public static String request(String httpUrl, String httpArg) {
BufferedReader reader = null;
String result = "";
StringBuffer sbf = new StringBuffer();
httpUrl = httpUrl + "?" + httpArg;
try {
URL url = new URL(httpUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("apikey", myAPpiKey);
conn.connect();
if (conn.getResponseCode() == 200) {
InputStream is = conn.getInputStream();
reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
String strRead = null;
while ((strRead = reader.readLine()) != null) {
sbf.append(strRead);
sbf.append("\r\n");
}
reader.close();
result = sbf.toString();
}
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
Above code worked well on Android 5.1 and Android 6.0, and it returned correct result that I want. But when I ran these on Android 4.4, using the same params, it returned different result. I have tried several times, and attached debugger to the process. I found that the connection could be built successfully, and the ResponseCode was also 200.
I guess there must be something wrong with the HttpURLConnection params, so that the server returned different result. Did I set the params in a way that could work on Android 5.1 and 6.0 but not on 4.4? Can anybody tell me where did I do wrong?

Try below code:
URL url = new URL(httpUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setChunkedStreamingMode(0);
conn.setDoInput(true);
conn.setRequestMethod("GET");
conn.setRequestProperty("apikey", myAPpiKey);
if (conn.getResponseCode() == 200) {
InputStream is = conn.getInputStream();
.........
}
It works for me. Hope it will work.

Does threading work, when external applications block each other?

I have two raspberry pi´s uploading content to a webpage from the same router, which occasionally makes them block access for each other. To prevent this in java, you would normally use threads and synchronize, wait/notify and all that - but how can you do that, when the applications don´t know about each others excistens? -
My code looks something like that - and works otherwise as expected.
public void sendStrings(String output) {
String url2 = "http://myhomepage.com";
HttpURLConnection connection = null;
try {
URL obj = new URL(url2);
connection = (HttpURLConnection) obj.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
connection.connect();
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(output);
writer.flush();
writer.close();
InputStream input = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String otherLine;
int responseCode = connection.getResponseCode();
}
catch (IOException e) {
} finally {
connection.disconnect();
}
}

Send formData in openConnection content withReader Grails

update : this is a duplicate,
i'm building a Proxy-custom-tag with grails taglib, per default it makes a get-request, now i'm facing the problem, that it should be able to handle Post-requests too,#
and i'm able to check the request-method and conditionally set the openConnection method to post if necessary, but i dont know how to append the post-params to the request.
here 's my code so far
def wordpressContent = { attrs, body ->
def url
def requestMethod = request.getMethod()
def queryString = request.getQueryString()?'&'+request.getQueryString():''
def content
println "method :"+requestMethod
println "params == "+params // <- inside here are the post-parameters
url = grailsApplication.config.wordpress.server.url+attrs.pageName+'?include=true'+queryString
try {
content = url.toURL().openConnection().with { conn ->
if(requestMethod == 'POST'){
println "Its a POST"
conn.setRequestMethod("POST")
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
// HOW to append the params here ?
}
readTimeout = 6000
if( responseCode != 200 ) {
throw new Exception( 'Not Ok' )
}
conn.content.withReader { r ->
r.text
}
}
}
catch( e ) {
println "exception : "+e
content="<div class='float' style='margin-top:10px;width:850px;background-color:white;border-radius:5px;padding:50px;'>Hier wird gerade gebaut</div>"
}
out << content
}
im very stuck here right now, i found answers saying to use this syntax
Writer wr = new OutputStreamWriter(conn.outputStream)
wr.write(postParams)
wr.flush()
wr.close()
but i dont know how to include that to my existing code,
for any hints thanks in advance
update: my solution was to build up the post-parameter-querystring by iterating over the params object in this pattern "xyz=zyx&abc=cba" and write it to the outputStream like above

// HTTP POST request
private void sendPost() throws Exception {
String url = "https://selfsolve.apple.com/wcResults.do";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
//add request header
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", USER_AGENT);
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
String urlParameters = "sn=C02G8416DRJM&cn=&locale=&caller=&num=12345";
// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + urlParameters);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
}
you are using grails so you can also use groovy HTTPBuilder like below
http://groovy.codehaus.org/modules/http-builder/doc/