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contiki/apps/twitter/twitter.c

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/*
* Copyright (c) 2009, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Contiki interface to posting Twitter messages
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "contiki-net.h"
#include "shell.h"
#include "twitter.h"
#include <stdio.h>
#include <string.h>
#define MAX_USERNAME_PASSWORD 32
#define MAX_MESSAGE 160
#define MAX_LENGTH 10
struct twitter_state {
unsigned char timer;
struct psock sin, sout;
char lengthstr[MAX_LENGTH];
char base64_username_password[MAX_USERNAME_PASSWORD];
char message[MAX_MESSAGE];
uint8_t inputbuf[UIP_TCP_MSS];
uip_ipaddr_t addr;
};
struct twitter_state conn;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
PROCESS(twitter_process, "Twitter client");
/*---------------------------------------------------------------------------*/
static uint8_t
base64_encode_6bits(uint8_t c)
{
if(c <= 25) {
return c + 'A';
} else if(c <= 51) {
return c - 26 + 'a';
} else if(c <= 61) {
return c - 52 + '0';
} else if(c == 62) {
return '+';
} else if(c == 63) {
return '/';
}
/* This shouldn't happen because only 6 bits of data should be
passed to this function. */
return '=';
}
/*---------------------------------------------------------------------------*/
static void
base64_encode_24bits(const uint8_t inputdata[], char outputdata[], int len)
{
switch(len) {
case 0:
outputdata[0] = outputdata[1] = outputdata[2] = outputdata[3] = '=';
break;
case 1:
outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30)));
outputdata[2] = outputdata[3] = '=';
break;
case 2:
outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30) |
(inputdata[1] >> 4)) & 0x3f);
outputdata[2] = base64_encode_6bits((((inputdata[1] << 2) & 0x3f)));
outputdata[3] = '=';
break;
case 3:
default:
outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30) |
(inputdata[1] >> 4)) & 0x3f);
outputdata[2] = base64_encode_6bits((((inputdata[1] << 2) & 0x3c) |
(inputdata[2] >> 6)) & 0x3f);
outputdata[3] = base64_encode_6bits((inputdata[2]) & 0x3f);
break;
}
}
/*---------------------------------------------------------------------------*/
int
twitter_post(const uint8_t *username_password, const char *msg)
{
int len;
int i, j;
struct twitter_state *s;
process_exit(&twitter_process);
/* s = (struct twitter_state *)memb_alloc(&conns);*/
s = &conn;
if(s == NULL) {
PRINTF("Could not allocate memory for the tweet\n");
return 0;
}
PSOCK_INIT(&s->sin, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
PSOCK_INIT(&s->sout, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
s->timer = 0;
/* dec64 encode username:password pair */
len = strlen((char *)username_password);
j = 0;
for(i = 0; i < len; i += 3) {
base64_encode_24bits(&username_password[i], &s->base64_username_password[j],
len - i);
j += 4;
}
s->base64_username_password[j] = 0;
/* Copy the status message, and avoid the leading whitespace. */
strcpy(s->message, "status=");
strcpy(&s->message[7], msg);
/* PRINTF("username_password '%s'\n", s->base64_username_password);
PRINTF("message '%s'\n", s->message);*/
/* Spawn process to deal with TCP connection */
process_start(&twitter_process, (char *)s);
return 1;
}
/*---------------------------------------------------------------------------*/
static int
handle_output(struct twitter_state *s)
{
PSOCK_BEGIN(&s->sout);
/* Send POST header */
PSOCK_SEND_STR(&s->sout, "POST /statuses/update.json HTTP/1.1\r\n");
/* Send Authorization header */
PSOCK_SEND_STR(&s->sout, "Authorization: Basic ");
PSOCK_SEND_STR(&s->sout, s->base64_username_password);
PSOCK_SEND_STR(&s->sout, "\r\n");
/* Send Agent header */
PSOCK_SEND_STR(&s->sout, "User-Agent: Contiki 2.x\r\n");
PSOCK_SEND_STR(&s->sout, "Host: twitter.com\r\n");
PSOCK_SEND_STR(&s->sout, "Accept: */*\r\n");
/* Send Content length header */
PSOCK_SEND_STR(&s->sout, "Content-Length: ");
snprintf(s->lengthstr, sizeof(s->lengthstr), "%d", strlen(s->message));
PSOCK_SEND_STR(&s->sout, s->lengthstr);
PSOCK_SEND_STR(&s->sout, "\r\n");
/* Send Content type header */
PSOCK_SEND_STR(&s->sout,
"Content-Type: application/x-www-form-urlencoded\r\n\r\n");
/* Send status message */
PSOCK_SEND_STR(&s->sout, s->message);
/* Close connection */
PSOCK_CLOSE(&s->sout);
PSOCK_EXIT(&s->sout);
PSOCK_END(&s->sout);
}
/*---------------------------------------------------------------------------*/
static int
handle_input(struct twitter_state *s)
{
PSOCK_BEGIN(&s->sin);
/* We don't care about input data for now */
PSOCK_END(&s->sin);
}
/*---------------------------------------------------------------------------*/
static void
handle_connection(struct twitter_state *s)
{
handle_input(s);
handle_output(s);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(twitter_process, ev, data)
{
struct twitter_state *s = data;
struct uip_conn *conn;
PROCESS_BEGIN();
/* Lookup host "twitter.com" */
/* XXX for now, just use 128.121.146.228 */
uip_ipaddr(&s->addr, 128,121,146,228);
/* Open a TCP connection to port 80 on twitter.com */
conn = tcp_connect(&s->addr, uip_htons(80), s);
if(conn == NULL) {
PRINTF("Could not open TCP connection\n");
/* memb_free(&conns, s);*/
PROCESS_EXIT();
}
while(1) {
PROCESS_WAIT_EVENT();
if(ev == tcpip_event) {
struct twitter_state *s = (struct twitter_state *)data;
if(uip_closed() || uip_aborted() || uip_timedout()) {
if(uip_closed()) {
PRINTF("Connection closed\n");
} else {
PRINTF("Connection aborted/timedout\n");
}
/* if(s != NULL) {
memb_free(&conns, s);
}*/
PROCESS_EXIT();
} else if(uip_connected()) {
handle_connection(s);
s->timer = 0;
} else if(s != NULL) {
if(uip_poll()) {
++s->timer;
if(s->timer >= 20) {
PRINTF("Timed out due to inactivity\n");
uip_abort();
PROCESS_EXIT();
/* memb_free(&conns, s);*/
}
} else {
s->timer = 0;
}
handle_connection(s);
} else {
PRINTF("Abort because s == NULL\n");
uip_abort();
PROCESS_EXIT();
}
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
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