SuperNET/InstantDEX/exchanges/bitstamp.c

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 * Copyright © 2014-2016 The SuperNET Developers.                             *
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 * See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at                  *
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#define EXCHANGE_NAME "bitstamp"
#define UPDATE prices777_ ## bitstamp
#define SUPPORTS bitstamp ## _supports
#define SIGNPOST bitstamp ## _signpost
#define TRADE bitstamp ## _trade
#define ORDERSTATUS bitstamp ## _orderstatus
#define CANCELORDER bitstamp ## _cancelorder
#define OPENORDERS bitstamp ## _openorders
#define TRADEHISTORY bitstamp ## _tradehistory
#define BALANCES bitstamp ## _balances
#define PARSEBALANCE bitstamp ## _parsebalance
#define WITHDRAW bitstamp ## _withdraw
#define EXCHANGE_AUTHURL "https://www.bitstamp.net/api"
#define CHECKBALANCE bitstamp ## _checkbalance

double UPDATE(struct prices777 *prices,int32_t maxdepth)
{
    if ( prices->url[0] == 0 )
        sprintf(prices->url,"https://www.bitstamp.net/api/order_book/");
    return(prices777_standard("bitstamp",prices->url,prices,0,0,maxdepth,0));
}

int32_t SUPPORTS(char *base,char *rel)
{
    char *baserels[][2] = { {"btc","usd"} };
    return(baserel_polarity(baserels,(int32_t)(sizeof(baserels)/sizeof(*baserels)),base,rel));
}

cJSON *SIGNPOST(void **cHandlep,int32_t dotrade,char **retstrp,struct exchange_info *exchange,char *method,char *payload)
{
    /*signature is a HMAC-SHA256 encoded message containing: nonce, customer ID (can be found here) and API key. The HMAC-SHA256 code must be generated using a secret key that was generated with your API key. This code must be converted to it's hexadecimal representation (64 uppercase characters).Example (Python):
     message = nonce + customer_id + api_key
     signature = hmac.new(API_SECRET, msg=message, digestmod=hashlib.sha256).hexdigest().upper()
     
     key - API key
     signature - signature
     nonce - nonce
     */
    char dest[1025],url[1024],req[1024],hdr1[512],hdr2[512],hdr3[512],hdr4[512],*sig,*data = 0;
    cJSON *json; uint64_t nonce;
    hdr1[0] = hdr2[0] = hdr3[0] = hdr4[0] = 0;
    nonce = exchange_nonce(exchange);
    sprintf(req,"%llu%s%s",(long long)nonce,exchange->userid,exchange->apikey);
    json = 0;
    if ( (sig= hmac_sha256_str(dest,exchange->apisecret,(int32_t)strlen(exchange->apisecret),req)) != 0 )
    {
        //touppercase(sig);
        //printf("req.(%s) sig.(%s)\n",req,sig);
        //sprintf(req,"{\"key\":\"%s\",\"signature\":\"%s\",\"nonce\":%llu%s}",exchange->apikey,sig,(long long)nonce,payload);
        sprintf(req,"key=%s&signature=%s&nonce=%llu%s",exchange->apikey,sig,(long long)nonce,payload);
        //printf("submit.(%s)\n",req);
        sprintf(url,"%s/%s/",EXCHANGE_AUTHURL,method);
        if ( dotrade == 0 )
            data = exchange_would_submit(req,hdr1,hdr2,hdr3,hdr4);
        else if ( (data= curl_post(cHandlep,url,0,req,req,hdr2,hdr3,hdr4)) != 0 )
            json = cJSON_Parse(data);
    }
    if ( retstrp != 0 )
        *retstrp = data;
    else if ( data != 0 )
        free(data);
    return(json);
}

char *PARSEBALANCE(struct exchange_info *exchange,double *balancep,char *coinstr)
{
    char field[128],*itemstr = 0; cJSON *obj,*item;
    *balancep = 0.;
    strcpy(field,coinstr);
    tolowercase(field);
    if ( exchange->balancejson != 0 && (obj= jobj(exchange->balancejson,"return")) != 0 && (item= jobj(obj,"funds")) != 0 )
    {
        *balancep = jdouble(item,field);
        obj = cJSON_CreateObject();
        touppercase(field);
        jaddstr(obj,"base",field);
        jaddnum(obj,"balance",*balancep);
        itemstr = jprint(obj,1);
    }
    if ( itemstr == 0 )
        return(clonestr("{\"error\":\"cant find coin balance\"}"));
    return(itemstr);
}

cJSON *BALANCES(void **cHandlep,struct exchange_info *exchange)
{
    return(SIGNPOST(cHandlep,1,0,exchange,"balance",""));
}

#include "checkbalance.c"

uint64_t TRADE(void **cHandlep,int32_t dotrade,char **retstrp,struct exchange_info *exchange,char *base,char *rel,int32_t dir,double price,double volume)
{
    char payload[1024],url[512],pairstr[512],*extra; cJSON *json; uint64_t txid = 0;
    if ( (extra= *retstrp) != 0 )
        *retstrp = 0;
    if ( (dir= flipstr_for_exchange(exchange,pairstr,"%s%s",dir,&price,&volume,base,rel)) == 0 )
    {
        printf("cant find baserel (%s/%s)\n",base,rel);
        return(0);
    }
    sprintf(url,"%s/%s/",EXCHANGE_AUTHURL,dir>0 ? "buy" : "sell");
    if ( CHECKBALANCE(retstrp,dotrade,exchange,dir,base,rel,price,volume) == 0 && (json= SIGNPOST(cHandlep,dotrade,retstrp,exchange,url,payload)) != 0 )
    {
        // parse json and set txid
        free_json(json);
    }
    return(txid);
}

char *ORDERSTATUS(void **cHandlep,struct exchange_info *exchange,cJSON *argjson,uint64_t quoteid)
{
    char jsonbuf[128];
    sprintf(jsonbuf,"&id=%llu",(long long)quoteid);
    return(jprint(SIGNPOST(cHandlep,1,0,exchange,"order_status",jsonbuf),1));
}

char *CANCELORDER(void **cHandlep,struct exchange_info *exchange,cJSON *argjson,uint64_t quoteid)
{
    char jsonbuf[128];
    sprintf(jsonbuf,"&id=%llu",(long long)quoteid);
    return(jprint(SIGNPOST(cHandlep,1,0,exchange,"cancel_order",jsonbuf),1));
}

char *OPENORDERS(void **cHandlep,struct exchange_info *exchange,cJSON *argjson)
{
    return(jprint(SIGNPOST(cHandlep,1,0,exchange,"open_orders",""),1));
}

char *TRADEHISTORY(void **cHandlep,struct exchange_info *exchange,cJSON *argjson)
{
    return(jprint(SIGNPOST(cHandlep,1,0,exchange,"user_transactions",""),1));
}

char *WITHDRAW(void **cHandlep,struct exchange_info *exchange,cJSON *argjson)
{
    return(clonestr("{\"error\":\"withdraw not yet\"}"));
}

struct exchange_funcs bitstamp_funcs = EXCHANGE_FUNCS(bitstamp,EXCHANGE_NAME);

#undef UPDATE
#undef SUPPORTS
#undef SIGNPOST
#undef TRADE
#undef ORDERSTATUS
#undef CANCELORDER
#undef OPENORDERS
#undef TRADEHISTORY
#undef BALANCES
#undef PARSEBALANCE
#undef WITHDRAW
#undef EXCHANGE_NAME
#undef EXCHANGE_AUTHURL
#undef CHECKBALANCE