/
HTTP.cpp
1396 lines (1311 loc) · 28.7 KB
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HTTP.cpp
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/**
* Powder Toy - HTTP Library
*
* Copyright (c) 2008 - 2010 Stanislaw Skowronek.
* Copyright (c) 2010 Simon Robertshaw
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include "common/String.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#ifndef WIN
#include <sys/param.h>
#endif
#if !defined(MACOSX) && !defined(BSD)
#include <malloc.h>
#endif
#include <ctime>
#ifdef WIN
#define _WIN32_WINNT 0x0501
//#include <iphlpapi.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <unistd.h>
#include <cerrno>
#include <fcntl.h>
#include <csignal>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#include "Config.h"
#include "Misc.h"
#include "HTTP.h"
#include "../MD5.h"
#include "Platform.h"
#ifdef WIN
#define PERROR SOCKET_ERROR
#define PERRNO WSAGetLastError()
#define PEAGAIN WSAEWOULDBLOCK
#define PEINTR WSAEINTR
#define PEINPROGRESS WSAEINPROGRESS
#define PEALREADY WSAEALREADY
#define PCLOSE closesocket
#else
#define PERROR -1
#define PERRNO errno
#define PEAGAIN EAGAIN
#define PEINTR EINTR
#define PEINPROGRESS EINPROGRESS
#define PEALREADY EALREADY
#define PCLOSE close
#endif
#ifdef _MSC_VER
#include <BaseTsd.h> //for SSIZE_T
typedef SSIZE_T ssize_t;
#endif
char * userAgent;
static int http_up = 0;
static int http_use_proxy = 0;
static struct sockaddr_in http_proxy;
static char * eatwhitespace(char * s)
{
while(*s)
{
if(!(*s == ' ' || *s == '\t'))
break;
s++;
}
return s;
}
static int splituri(const char *uri, char **host, char **path)
{
const char *q;
char *x,*y;
if (!strncmp(uri, "http://", 7))
uri += 7;
q = strchr(uri, '/');
if (!q)
q = uri + strlen(uri);
x = (char *)malloc(q-uri+1);
if (*q)
y = mystrdup(q);
else
{
y = mystrdup("/");
}
strncpy(x, uri, q-uri);
x[q-uri] = 0;
if (q==uri || x[q-uri-1]==':')
{
free(x);
free(y);
return 1;
}
*host = x;
*path = y;
return 0;
}
static char *getserv(char *host)
{
char *q, *x = mystrdup(host);
q = strchr(x, ':');
if (q)
*q = 0;
return x;
}
static char *getport(char *host)
{
char *p, *q;
q = strchr(host, ':');
if (q)
p = mystrdup(q+1);
else
p = mystrdup("80");
return p;
}
static int resolve(char *dns, char *srv, struct sockaddr_in *addr)
{
struct addrinfo hnt, *res = 0;
if (http_use_proxy)
{
memcpy(addr, &http_proxy, sizeof(struct sockaddr_in));
return 0;
}
memset(&hnt, 0, sizeof(hnt));
hnt.ai_family = AF_INET;
hnt.ai_socktype = SOCK_STREAM;
if (getaddrinfo(dns, srv, &hnt, &res))
return 1;
if (res)
{
if (res->ai_family != AF_INET)
{
freeaddrinfo(res);
return 1;
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
return 0;
}
return 1;
}
void http_init(char *proxy)
{
char *host, *port;
#ifdef WIN
WSADATA wsadata;
if (!WSAStartup(MAKEWORD(2,2), &wsadata))
http_up = 1;
#else
signal(SIGPIPE, SIG_IGN);
http_up = 1;
#endif
if (proxy)
{
host = getserv(proxy);
port = getport(proxy);
if (resolve(host, port, &http_proxy))
http_up = 0;
else
http_use_proxy = 1;
free(host);
free(port);
}
ByteString newUserAgent = ByteString::Build("PowderToy/", SAVE_VERSION, ".", MINOR_VERSION, " (", IDENT_PLATFORM, "; ", IDENT_BUILD, "; M", MOD_ID, ") TPTPP/", SAVE_VERSION, ".", MINOR_VERSION, ".", BUILD_NUM, IDENT_RELTYPE, ".", SNAPSHOT_ID);
userAgent = new char[newUserAgent.length()+1];
std::copy(newUserAgent.begin(), newUserAgent.end(), userAgent);
userAgent[newUserAgent.length()] = 0;
//"User-Agent: PowderToy/%d.%d (%s; %s; M%d) TPTPP/%d.%d.%d%s.%d\n", SAVE_VERSION, MINOR_VERSION, IDENT_PLATFORM, IDENT_BUILD, 0, SAVE_VERSION, MINOR_VERSION, BUILD_NUM, IDENT_RELTYPE, SNAPSHOT_ID
//User-Agent: PowderToy/94.1 (MACOSX; 342; M0) TPTPP/94.1.342R.0
}
void http_done(void)
{
#ifdef WIN
WSACleanup();
#endif
http_up = 0;
}
#define CHUNK 4096
#define HTS_STRT 0
#define HTS_RSLV 1
#define HTS_CONN 2
#define HTS_IDLE 3
#define HTS_XMIT 4
#define HTS_RECV 5
#define HTS_DONE 6
struct http_ctx
{
int state;
time_t last;
int keep;
int ret;
char *host, *path;
char *thdr;
int thlen;
char *txd;
int txdl;
struct sockaddr_in addr;
char *tbuf;
int tlen, tptr;
char *hbuf;
int hlen, hptr;
char *rbuf;
int rlen, rptr;
int chunked, chunkhdr, rxtogo, contlen, cclose;
int fd;
char *fdhost;
};
void *http_async_req_start(void *ctx, const char *uri, const char *data, int dlen, int keep)
{
struct http_ctx *cx = (http_ctx *)ctx;
if (cx && time(NULL) - cx->last > http_timeout)
{
http_force_close(ctx);
http_async_req_close(ctx);
ctx = NULL;
}
if (!ctx)
{
ctx = calloc(1, sizeof(struct http_ctx));
cx = (http_ctx *)ctx;
cx->fd = PERROR;
}
if (!cx->hbuf)
{
cx->hbuf = (char *)malloc(256);
cx->hlen = 256;
}
if (!http_up)
{
cx->ret = 604;
cx->state = HTS_DONE;
return ctx;
}
if (cx->state!=HTS_STRT && cx->state!=HTS_IDLE)
{
fprintf(stderr, "HTTP: unclean request restart state.\n");
exit(1);
}
cx->keep = keep;
cx->ret = 600;
if (splituri(uri, &cx->host, &cx->path))
{
cx->ret = 601;
cx->state = HTS_DONE;
return ctx;
}
if (http_use_proxy)
{
free(cx->path);
cx->path = mystrdup(uri);
}
if (cx->fdhost && strcmp(cx->host, cx->fdhost))
{
free(cx->fdhost);
cx->fdhost = NULL;
PCLOSE(cx->fd);
cx->fd = PERROR;
cx->state = HTS_STRT;
}
if (data)
{
if (!dlen)
dlen = strlen(data);
cx->txd = (char *)malloc(dlen);
memcpy(cx->txd, data, dlen);
cx->txdl = dlen;
}
else
cx->txdl = 0;
cx->contlen = 0;
cx->chunked = 0;
cx->chunkhdr = 0;
cx->rxtogo = 0;
cx->cclose = 0;
cx->tptr = 0;
cx->tlen = 0;
cx->last = time(NULL);
return ctx;
}
void http_async_add_header(void *ctx, const char *name, const char *data)
{
struct http_ctx *cx = (http_ctx *)ctx;
cx->thdr = (char *)realloc(cx->thdr, cx->thlen + strlen(name) + strlen(data) + 5);
cx->thlen += sprintf(cx->thdr+cx->thlen, "%s: %s\r\n", name, data);
}
static void process_header(struct http_ctx *cx, char *str)
{
char *p;
if (cx->chunkhdr)
{
p = strchr(str, ';');
if (p)
*p = 0;
cx->rxtogo = strtoul(str, NULL, 16);
cx->chunkhdr = 0;
if (!cx->rxtogo)
cx->chunked = 0;
}
if (!str[0])
{
cx->rxtogo = cx->contlen;
cx->chunkhdr = cx->chunked;
if (!cx->contlen && !cx->chunked && cx->ret!=100)
cx->state = HTS_DONE;
return;
}
if (!strncmp(str, "http/", 5))
{
p = strchr(str, ' ');
if (!p)
{
cx->ret = 603;
cx->state = HTS_DONE;
return;
}
p++;
cx->ret = atoi(p);
return;
}
if (!strncmp(str, "content-length: ", 16))
{
str = eatwhitespace(str+16);
cx->contlen = atoi(str);
return;
}
if (!strncmp(str, "transfer-encoding: ", 19))
{
str = eatwhitespace(str+19);
if(!strncmp(str, "chunked", 8))
{
cx->chunked = 1;
}
return;
}
if (!strncmp(str, "connection: ", 12))
{
str = eatwhitespace(str+12);
if(!strncmp(str, "close", 6))
{
cx->cclose = 1;
}
return;
}
}
static void process_byte(struct http_ctx *cx, char ch)
{
if (cx->rxtogo)
{
cx->rxtogo--;
if (!cx->rbuf)
{
cx->rbuf = (char *)malloc(256);
cx->rlen = 256;
}
if (cx->rptr >= cx->rlen-1)
{
cx->rlen *= 2;
cx->rbuf = (char *)realloc(cx->rbuf, cx->rlen);
}
cx->rbuf[cx->rptr++] = ch;
if (!cx->rxtogo && !cx->chunked)
cx->state = HTS_DONE;
}
else
{
if (ch == '\n')
{
cx->hbuf[cx->hptr] = 0;
process_header(cx, cx->hbuf);
cx->hptr = 0;
}
else if (ch != '\r')
{
if (cx->hptr >= cx->hlen-1)
{
cx->hlen *= 2;
cx->hbuf = (char *)realloc(cx->hbuf, cx->hlen);
}
cx->hbuf[cx->hptr++] = tolower(ch);
}
}
}
int http_async_req_status(void *ctx)
{
struct http_ctx *cx = (http_ctx *)ctx;
char *dns,*srv,buf[CHUNK];
int tmp, i;
time_t now = time(NULL);
#ifdef WIN
unsigned long tmp2;
#endif
switch (cx->state)
{
case HTS_STRT:
dns = getserv(cx->host);
srv = getport(cx->host);
if (resolve(dns, srv, &cx->addr))
{
free(dns);
free(srv);
cx->state = HTS_DONE;
cx->ret = 602;
return 1;
}
free(dns);
free(srv);
cx->state = HTS_RSLV;
return 0;
case HTS_RSLV:
cx->state = HTS_CONN;
cx->last = now;
return 0;
case HTS_CONN:
if (cx->fd == PERROR)
{
cx->fd = socket(AF_INET, SOCK_STREAM, 0);
if (cx->fd == PERROR)
goto fail;
cx->fdhost = mystrdup(cx->host);
#ifdef WIN
tmp2 = 1;
if (ioctlsocket(cx->fd, FIONBIO, &tmp2) == SOCKET_ERROR)
goto fail;
#else
tmp = fcntl(cx->fd, F_GETFL);
if (tmp < 0)
goto fail;
if (fcntl(cx->fd, F_SETFL, tmp|O_NONBLOCK) < 0)
goto fail;
#endif
}
if (!connect(cx->fd, (struct sockaddr *)&cx->addr, sizeof(cx->addr)))
cx->state = HTS_IDLE;
#ifdef WIN
else if (PERRNO==WSAEISCONN)
cx->state = HTS_IDLE;
#endif
#if defined(MACOSX) || defined(BSD)
else if (PERRNO==EISCONN)
cx->state = HTS_IDLE;
#endif
else if (PERRNO!=PEINPROGRESS && PERRNO!=PEALREADY
#ifdef WIN
&& PERRNO!=PEAGAIN && PERRNO!=WSAEINVAL
#endif
)
goto fail;
if (now-cx->last>http_timeout)
goto timeout;
return 0;
case HTS_IDLE:
if (cx->txdl)
{
// generate POST
cx->tbuf = (char *)malloc(strlen(cx->host) + strlen(cx->path) + 132 + strlen(userAgent) + cx->txdl + cx->thlen);
cx->tptr = 0;
cx->tlen = 0;
cx->tlen += sprintf(cx->tbuf+cx->tlen, "POST %s HTTP/1.1\r\n", cx->path);
cx->tlen += sprintf(cx->tbuf+cx->tlen, "Host: %s\r\n", cx->host);
if (!cx->keep)
cx->tlen += sprintf(cx->tbuf+cx->tlen, "Connection: close\r\n");
if (cx->thdr)
{
memcpy(cx->tbuf+cx->tlen, cx->thdr, cx->thlen);
cx->tlen += cx->thlen;
free(cx->thdr);
cx->thdr = NULL;
cx->thlen = 0;
}
cx->tlen += sprintf(cx->tbuf+cx->tlen, "Content-Length: %d\r\n", cx->txdl);
cx->tlen += sprintf(cx->tbuf+cx->tlen, "User-Agent: %s\r\n", userAgent);
cx->tlen += sprintf(cx->tbuf+cx->tlen, "\r\n");
memcpy(cx->tbuf+cx->tlen, cx->txd, cx->txdl);
cx->tlen += cx->txdl;
free(cx->txd);
cx->txd = NULL;
cx->txdl = 0;
}
else
{
// generate GET
cx->tbuf = (char *)malloc(strlen(cx->host) + strlen(cx->path) + 98 + strlen(userAgent) + cx->thlen);
cx->tptr = 0;
cx->tlen = 0;
cx->tlen += sprintf(cx->tbuf+cx->tlen, "GET %s HTTP/1.1\r\n", cx->path);
cx->tlen += sprintf(cx->tbuf+cx->tlen, "Host: %s\r\n", cx->host);
if (cx->thdr)
{
memcpy(cx->tbuf+cx->tlen, cx->thdr, cx->thlen);
cx->tlen += cx->thlen;
free(cx->thdr);
cx->thdr = NULL;
cx->thlen = 0;
}
if (!cx->keep)
cx->tlen += sprintf(cx->tbuf+cx->tlen, "Connection: close\r\n");
cx->tlen += sprintf(cx->tbuf+cx->tlen, "User-Agent: %s\r\n", userAgent);
cx->tlen += sprintf(cx->tbuf+cx->tlen, "\r\n");
}
cx->state = HTS_XMIT;
cx->last = now;
return 0;
case HTS_XMIT:
tmp = send(cx->fd, cx->tbuf+cx->tptr, cx->tlen-cx->tptr, 0);
if (tmp==PERROR && PERRNO!=PEAGAIN && PERRNO!=PEINTR)
goto fail;
if (tmp!=PERROR && tmp)
{
cx->tptr += tmp;
if (cx->tptr == cx->tlen)
{
cx->tptr = 0;
cx->tlen = 0;
if (cx->tbuf)
{
free(cx->tbuf);
cx->tbuf = NULL;
}
cx->state = HTS_RECV;
}
cx->last = now;
}
if (now-cx->last>http_timeout)
goto timeout;
return 0;
case HTS_RECV:
tmp = recv(cx->fd, buf, CHUNK, 0);
if (tmp==PERROR && PERRNO!=PEAGAIN && PERRNO!=PEINTR)
goto fail;
if (tmp!=PERROR && tmp)
{
for (i=0; i<tmp; i++)
{
process_byte(cx, buf[i]);
if (cx->state == HTS_DONE)
return 1;
}
cx->last = now;
}
if (now-cx->last>http_timeout)
goto timeout;
return 0;
case HTS_DONE:
return 1;
}
return 0;
fail:
cx->ret = 600;
cx->state = HTS_DONE;
return 1;
timeout:
cx->ret = 605;
cx->state = HTS_DONE;
return 1;
}
char *http_async_req_stop(void *ctx, int *ret, int *len)
{
struct http_ctx *cx = (http_ctx *)ctx;
char *rxd;
if (cx->state != HTS_DONE)
while (!http_async_req_status(ctx))
Platform::Millisleep(1);
if (cx->host)
{
free(cx->host);
cx->host = NULL;
}
if (cx->path)
{
free(cx->path);
cx->path = NULL;
}
if (cx->txd)
{
free(cx->txd);
cx->txd = NULL;
cx->txdl = 0;
}
if (cx->tbuf)
{
free(cx->tbuf);
cx->tbuf = NULL;
}
if (cx->hbuf)
{
free(cx->hbuf);
cx->hbuf = NULL;
}
if (cx->thdr)
{
free(cx->thdr);
cx->thdr = NULL;
cx->thlen = 0;
}
if (ret)
*ret = cx->ret;
if (len)
*len = cx->rptr;
if (cx->rbuf)
cx->rbuf[cx->rptr] = 0;
rxd = cx->rbuf;
cx->rbuf = NULL;
cx->rlen = 0;
cx->rptr = 0;
cx->contlen = 0;
if (!cx->keep)
http_async_req_close(ctx);
else if (cx->cclose)
{
PCLOSE(cx->fd);
cx->fd = PERROR;
if (cx->fdhost)
{
free(cx->fdhost);
cx->fdhost = NULL;
}
cx->state = HTS_STRT;
}
else
cx->state = HTS_IDLE;
return rxd;
}
void http_async_get_length(void *ctx, int *total, int *done)
{
struct http_ctx *cx = (http_ctx *)ctx;
if (done)
*done = cx->rptr;
if (total)
*total = cx->contlen;
}
void http_force_close(void *ctx)
{
struct http_ctx *cx = (struct http_ctx*)ctx;
cx->state = HTS_DONE;
}
void http_async_req_close(void *ctx)
{
struct http_ctx *cx = (http_ctx *)ctx;
void *tmp;
if (cx->host)
{
cx->keep = 1;
tmp = http_async_req_stop(ctx, NULL, NULL);
free(tmp);
}
free(cx->fdhost);
PCLOSE(cx->fd);
free(ctx);
}
char *http_simple_get(const char *uri, int *ret, int *len)
{
void *ctx = http_async_req_start(NULL, uri, NULL, 0, 0);
if (!ctx)
{
if (ret)
*ret = 600;
if (len)
*len = 0;
return NULL;
}
return http_async_req_stop(ctx, ret, len);
}
void http_auth_headers(void *ctx, const char *user, const char *pass, const char *session_id)
{
char *tmp;
int i;
unsigned char hash[16];
struct md5_context md5;
if (user && strlen(user))
{
if (pass)
{
md5_init(&md5);
md5_update(&md5, (unsigned char *)user, strlen(user));
md5_update(&md5, (unsigned char *)"-", 1);
md5_update(&md5, (unsigned char *)pass, strlen(pass));
md5_final(hash, &md5);
tmp = (char *)malloc(33);
for (i=0; i<16; i++)
{
tmp[i*2] = hexChars[hash[i]>>4];
tmp[i*2+1] = hexChars[hash[i]&15];
}
tmp[32] = 0;
http_async_add_header(ctx, "X-Auth-Hash", tmp);
free(tmp);
}
if (session_id && strlen(session_id))
{
http_async_add_header(ctx, "X-Auth-User-Id", user);
http_async_add_header(ctx, "X-Auth-Session-Key", session_id);
}
else
{
http_async_add_header(ctx, "X-Auth-User", user);
}
}
}
char *http_auth_get(const char *uri, const char *user, const char *pass, const char *session_id, int *ret, int *len)
{
void *ctx = http_async_req_start(NULL, uri, NULL, 0, 0);
if (!ctx)
{
if (ret)
*ret = 600;
if (len)
*len = 0;
return NULL;
}
http_auth_headers(ctx, user, pass, session_id);
return http_async_req_stop(ctx, ret, len);
}
char *http_simple_post(const char *uri, const char *data, int dlen, int *ret, int *len)
{
void *ctx = http_async_req_start(NULL, uri, data, dlen, 0);
if (!ctx)
{
if (ret)
*ret = 600;
if (len)
*len = 0;
return NULL;
}
return http_async_req_stop(ctx, ret, len);
}
const char *http_ret_text(int ret)
{
switch (ret)
{
case 0:
return "Status code 0 (bug?)";
case 100:
return "Continue";
case 101:
return "Switching Protocols";
case 102:
return "Processing";
case 200:
return "OK";
case 201:
return "Created";
case 202:
return "Accepted";
case 203:
return "Non-Authoritative Information";
case 204:
return "No Content";
case 205:
return "Reset Content";
case 206:
return "Partial Content";
case 207:
return "Multi-Status";
case 300:
return "Multiple Choices";
case 301:
return "Moved Permanently";
case 302:
return "Found";
case 303:
return "See Other";
case 304:
return "Not Modified";
case 305:
return "Use Proxy";
case 306:
return "Switch Proxy";
case 307:
return "Temporary Redirect";
case 400:
return "Bad Request";
case 401:
return "Unauthorized";
case 402:
return "Payment Required";
case 403:
return "Forbidden";
case 404:
return "Not Found";
case 405:
return "Method Not Allowed";
case 406:
return "Not Acceptable";
case 407:
return "Proxy Authentication Required";
case 408:
return "Request Timeout";
case 409:
return "Conflict";
case 410:
return "Gone";
case 411:
return "Length Required";
case 412:
return "Precondition Failed";
case 413:
return "Request Entity Too Large";
case 414:
return "Request URI Too Long";
case 415:
return "Unsupported Media Type";
case 416:
return "Requested Range Not Satisfiable";
case 417:
return "Expectation Failed";
case 418:
return "I'm a teapot";
case 422:
return "Unprocessable Entity";
case 423:
return "Locked";
case 424:
return "Failed Dependency";
case 425:
return "Unordered Collection";
case 426:
return "Upgrade Required";
case 444:
return "No Response";
case 450:
return "Blocked by Windows Parental Controls";
case 499:
return "Client Closed Request";
case 500:
return "Internal Server Error";
case 501:
return "Not Implemented";
case 502:
return "Bad Gateway";
case 503:
return "Service Unavailable";
case 504:
return "Gateway Timeout";
case 505:
return "HTTP Version Not Supported";
case 506:
return "Variant Also Negotiates";
case 507:
return "Insufficient Storage";
case 509:
return "Bandwidth Limit Exceeded";
case 510:
return "Not Extended";
case 600:
return "Internal Client Error";
case 601:
return "Unsupported Protocol";
case 602:
return "Server Not Found";
case 603:
return "Malformed Response";
case 604:
return "Network Not Available";
case 605:
return "Request Timed Out";
default:
return "Unknown Status Code";
}
}
// Find the boundary used in the multipart POST request
// the boundary is a string that never appears in any of the parts, ex. 'A92'
// keeps looking recursively until it finds one
ByteString FindBoundary(std::map<ByteString, ByteString> parts, ByteString boundary)
{
// we only look for a-zA-Z0-9 chars
unsigned int map[62];
size_t blen = boundary.length();
std::fill(&map[0], &map[62], 0);
for (std::map<ByteString, ByteString>::iterator iter = parts.begin(); iter != parts.end(); iter++)
{
// loop through every character in each part and search for the substring, adding 1 to map for every character found (character after the substring)
for (ssize_t j = 0; j < (ssize_t)((*iter).second.length()-blen); j++)
if (!blen || (*iter).second.Substr(j, blen) == boundary)
{
unsigned char ch = (*iter).second[j+blen];
if (ch >= '0' && ch <= '9')
map[ch-'0']++;
else if (ch >= 'A' && ch <= 'Z')
map[ch-'A'+10]++;
else if (ch >= 'a' && ch <= 'z')
map[ch-'a'+36]++;
}
}
// find which next character occurs the least (preferably it occurs 0 times which means we have a match)
unsigned int lowest = 0;
for (unsigned int i = 1; i < 62; i++)
{
if (!map[lowest])
break;
if (map[i] < map[lowest])
lowest = i;
}
// add the least frequent character to our boundary
if (lowest < 10)
boundary += '0'+lowest;
else if (lowest < 36)
boundary += 'A'+(lowest-10);
else
boundary += 'a'+(lowest-36);
if (map[lowest])
return FindBoundary(parts, boundary);
else
return boundary;
}
// Generates a MIME multipart message to be used in POST requests
// see https://en.wikipedia.org/wiki/MIME#Multipart_messages
// this function used in Request class, and eventually all http requests
ByteString GetMultipartMessage(std::map<ByteString, ByteString> parts, ByteString boundary)
{
ByteStringBuilder data;
// loop through each part, adding it
for (std::map<ByteString, ByteString>::iterator iter = parts.begin(); iter != parts.end(); iter++)
{
ByteString name = (*iter).first;
ByteString value = (*iter).second;
data << "--" << boundary << "\r\n";
data << "Content-transfer-encoding: binary" << "\r\n";
// colon p
if (ByteString::Split split = name.SplitBy(':'))
{
// used to upload files (save data)
data << "content-disposition: form-data; name=\"" << split.Before() << "\"";