supertweet.cpp

00001 #include "EthernetNetIf.h"
00002 #include "SimpleSocket.h"
00003 #include <ctype.h>
00004 
00005 void encodeBase64(char *ibuf, char *obuf);
00006 int encodeFormUrl(char *s, char *t);
00007 
00008 void supertweet() {
00009     EthernetNetIf eth;
00010     eth.setup();
00011     ClientSocket client("66.180.175.246", 80); // api.supertweet.net
00012 
00013     char user[16], password[16], message[64] = {};
00014     printf("user => ");
00015     scanf("%s", user);
00016     printf("password => ");
00017     scanf("%s", password);
00018     printf("message => ");
00019     int c = 0;
00020     while (c < ' ' || 0x7E < c)
00021         c = getc(stdin);
00022     ungetc(c, stdin);
00023     for (int i = 0; i < sizeof(message) - 1 && (c = getc(stdin)) >= ' '; i++)
00024         message[i] = c;
00025 
00026     char credential[48], credential2[64], message2[256];
00027 
00028     sprintf(credential, "%s:%s", user, password);
00029     encodeBase64(credential, credential2);
00030     encodeFormUrl(message, message2);
00031 
00032     const char *request =
00033         "POST /1/statuses/update.xml HTTP/1.1\r\n"
00034         "Host: api.supertweet.net\r\n"
00035         "Authorization: Basic %s\r\n"
00036         "Content-Length: %d\r\n"
00037         "Content-Type: application/x-www-form-urlencoded\r\n"
00038         "\r\n"
00039         "status=%s";
00040 
00041     client.printf(request, credential2, strlen(message2) + 7,  message2);
00042     printf(request, credential2, strlen(message2) + 7,  message2);
00043     printf("\n");
00044 
00045     while (client) {
00046         if (client.available()) {
00047             while (client.available()) {
00048                 char response[128] = {};
00049                 client.read(response, sizeof(response) - 1);
00050                 printf("%s", response);
00051             }
00052             client.close();
00053         }
00054     }
00055     printf("\ndone\n");
00056 }
00057 
00058 int encodeFormUrl(char *s, char *t) {
00059     char *head = t;
00060     for (char c; (c = *s) != 0; s++)
00061         switch (c) {
00062             case '\r':
00063                 break;
00064             case ' ' :
00065                 *t++ = '+';
00066                 break;
00067             default:
00068                 t += sprintf(t, isalnum(c) ? "%c" : (c == '\n') ? "\r%c" : "%%%02X", c);
00069         }
00070     *t = '\0';
00071     return t - head;
00072 }
00073 
00074 void encodeBase64(char ibuf[], int length, char *obuf) {
00075     const char BASE64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
00076     int i, j;
00077     for (i = j = 0; j < length; j += 3, i += 4) {
00078         long a = ibuf[j] << 16 | (j + 1 < length ? ibuf[j + 1] << 8 : 0) | (j + 2 < length ? ibuf[j + 2] : 0);
00079         for (int k = 3; k >= 0; k--, a >>= 6)
00080             obuf[i + k] = (j + k - 1) < length ? BASE64[a & 63] : '=';
00081     }
00082     obuf[i] = '\0';
00083 }
00084 
00085 void encodeBase64(char *ibuf, char *obuf) {
00086     encodeBase64(ibuf, strlen(ibuf), obuf);
00087 }