File content as of revision 0:632cb8c03ca3:

/*
 * mbed pseudo Comet HTTP Client
 * Copyright (c) 2011 Hiroshi Suga
 * Released under the MIT License: http://mbed.org/license/mit
 */

/** @file
 * @brief pseudo Comet HTTP Client
 */

#include "mbed.h"
#include "EthernetNetIf.h"
#include "TCPSocket.h"
#include "DNSRequest.h"
#include "RingBuffer.h"
#include "CometClient.h"
#include <ctype.h>

#define DEBUG
#include "dbg.h"


static TCPSocket *http;
static volatile int tcp_ready = 0, tcp_readable = 0, tcp_writable = 0;
static volatile int tcp_busy = 0, mode = 0;
static volatile int dns_status = 0;
static Host remote;
static RingBuffer fifo(1500);
static char remoteuri[100];


// Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
int base64enc(const char *input, unsigned int length, char *output, int len) {
  static const char base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  unsigned int c, c1, c2, c3;

  if (len < ((((length-1)/3)+1)<<2)) return -1;
  for(unsigned int i = 0, j = 0; i<length; i+=3,j+=4) {
    c1 = ((((unsigned char)*((unsigned char *)&input[i]))));
    c2 = (length>i+1)?((((unsigned char)*((unsigned char *)&input[i+1])))):0;
    c3 = (length>i+2)?((((unsigned char)*((unsigned char *)&input[i+2])))):0;

    c = ((c1 & 0xFC) >> 2);
    output[j+0] = base64[c];
    c = ((c1 & 0x03) << 4) | ((c2 & 0xF0) >> 4);
    output[j+1] = base64[c];
    c = ((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6);
    output[j+2] = (length>i+1)?base64[c]:'=';
    c = (c3 & 0x3F);
    output[j+3] = (length>i+2)?base64[c]:'=';
  }
  output[(((length-1)/3)+1)<<2] = '\0';
  return 0;
}

// Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
int urlencode(char *str, char *buf, int len) {
  static const char to_hex[] = "0123456789ABCDEF";
//  char *pstr = str, *buf = (char*)malloc(strlen(str) * 3 + 1), *pbuf = buf;
  char *pstr = str, *pbuf = buf;

  if (len < (strlen(str) * 3 + 1)) return -1;
  while (*pstr) {
    if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~') {
      *pbuf++ = *pstr;
    } else if (*pstr == ' ') {
      *pbuf++ = '+';
    } else { 
      *pbuf++ = '%';
      *pbuf++ = to_hex[(*pstr >> 4) & 0x0f];
      *pbuf++ = to_hex[*pstr & 0x0f];
    }
    pstr++;
  }
  *pbuf = '\0';
  return 0;
}


void isr_http (TCPSocketEvent e) {

    DBG("http(%d)\r\n", e);
    switch(e) {
    case TCPSOCKET_CONNECTED:
        tcp_ready = 1;
        tcp_busy = 0;
        mode = 0;
        break;

    case TCPSOCKET_READABLE: //Incoming data
        {
        char buf[1500];
        int i = 0, len;

        len = http->recv(buf, sizeof(buf));
        for (i = 0; i < len; i ++) {
            switch (mode) {
            case 0:
                if (strncmp(buf, "HTTP/", 5) == 0 && atoi(&buf[9]) == 200) {
                    mode = 1;
                }
                break;
            case 1:
            case 2:
                if (buf[i] == '\r') {
                    mode ++;
                } else
                if (buf[i] == '\n') {
                } else {
                    mode = 1;
                }
                break;
            case 3:
                if (buf[i] == 0x7f) {
                    mode = 4;
                }
                break;
            case 4:
                fifo.put(buf[i]);
                break;
            }
        }
        } // Incoming data
        tcp_readable = 1;
        break;

    case TCPSOCKET_WRITEABLE: //We can send data
        tcp_writable = 1;
        break;

    case TCPSOCKET_CONTIMEOUT:
    case TCPSOCKET_CONRST:
    case TCPSOCKET_CONABRT:
    case TCPSOCKET_ERROR:
    case TCPSOCKET_DISCONNECTED:
        http->close();
        tcp_ready = 0;
        tcp_readable = 0;
        tcp_writable = 0;
        tcp_busy = 0;
        break;
    }
}

void createauth (char *user, char *pwd, char *buf, int len) {
    char tmp[80];

    strncpy(buf, "Authorization: Basic ", len);
    snprintf(tmp, sizeof(tmp), "%s:%s", user, pwd);
    base64enc(tmp, strlen(tmp), &buf[strlen(buf)], len - strlen(buf));
    strncat(buf, "\r\n", len - strlen(buf));
}

void isr_dns (DNSReply r) {

    DBG("dns(%d)\r\n", r);
    if (DNS_FOUND) {
        dns_status = 1;
    } else {
        dns_status = -1;
    }
}

void pollComet () {
    Net::poll();

    if (! tcp_ready && ! tcp_busy) {
        tcp_busy = 1;
        openComet(NULL, NULL, NULL, NULL);
    }
}

int recvComet (char *buf, int size) {
    int i, len;

    len = fifo.use();
    if (len == 0) return 0;
    DBG("readComet %d\r\n", len);
    if (len > size) len = size;

    for (i = 0; i < len; i ++) {
        if (fifo.get(&buf[i])) break;
    }
    tcp_readable = 0;
    return len;
}

int sendComet (char *buf) {
    while (tcp_busy) {
        Net::poll();
    }

    tcp_busy = 1;
    if (tcp_ready) {
        DBG("sendComet close\r\n");
        http->close();
    }
    DBG("sendComet open\r\n");
    openComet(NULL, NULL, NULL, buf);
    return 0;
}

int openComet (Host *host, char *uri, char *head, char *body) {
    TCPSocketErr err;
    Timer timeout;
    char buf[1500];

    tcp_busy = 1;
    if (host) {
      http = new TCPSocket;
      http->setOnEvent(isr_http);

      // connect
      if (host->getIp().isNull()) {
        // resolv
        DNSRequest dns;
        dns_status = 0;
        dns.setOnReply(isr_dns);
        if (dns.resolve(host) != DNS_OK) goto exit;
        timeout.reset();
        timeout.start();
        while (timeout.read_ms() < HTTP_TIMEOUT) {
            if (dns_status) break;
            Net::poll();
        }
        timeout.stop();
        if (dns_status <= 0) goto exit;
        DBG("%s [%d.%d.%d.%d]\r\n", host->getName(), (unsigned char)host->getIp()[0], (unsigned char)host->getIp()[1], (unsigned char)host->getIp()[2], (unsigned char)host->getIp()[3]);
      }
      if (! host->getPort()) {
        host->setPort(HTTP_PORT);
      }

      remote = *host;
      strncpy(remoteuri, uri, sizeof(remoteuri));
    } // if (host)

    err = http->connect(remote);
    if (err != TCPSOCKET_OK) goto exit;

    // wait connect
    timeout.reset();
    timeout.start();
    while (timeout.read_ms() < HTTP_TIMEOUT) {
        if (tcp_ready) break;
        Net::poll();
    }
    timeout.stop();
    if (! tcp_ready) goto exit;

    // send request
    http->send("POST ", 5);
    http->send(remoteuri, strlen(remoteuri));
    http->send(" HTTP/1.1\r\nHost: ", 17);
    http->send(remote.getName(), strlen(remote.getName()));
    http->send("\r\n", 2);
    http->send("Connection: close\r\n", 19);
    http->send("Content-type: application/x-www-form-urlencoded\r\n", 49);
    if (head) {
        http->send(head, strlen(head));
    }
    sprintf(buf, "Content-Length: %d\r\n", strlen(body));
    http->send(buf, strlen(buf));
    http->send("\r\n", 2);

    // post method
    if (body) {
        http->send(body, strlen(body));
    }

    Net::poll();
    return 0;

exit:
    http->resetOnEvent();
    http->close();
    delete http;

    return -1;
}