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#include <algorithm>
#include <assert.h>
#include <iostream>
#include <fstream>
#include <glog/logging.h>
#include <boost/algorithm/string.hpp>
#include <stdio.h>
#include <string.h>
#ifndef WIN32
#include <sys/time.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include "uscxml/Common.h"
#include "URL.h"
#include "uscxml/config.h"
#include <stdio.h> /* defines FILENAME_MAX */
#ifdef _WIN32
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <io.h>
#include <direct.h>
#define getcwd _getcwd
#else
#include <unistd.h>
#endif
#include <cstdlib> // mkstemp
#ifdef HAS_UNISTD_H
#include <unistd.h> // mkstemp legacy
#endif
namespace uscxml {
URLImpl::~URLImpl() {
if (_localFile.length() > 0)
remove(_localFile.c_str());
}
const bool URLImpl::toAbsoluteCwd() {
char currPath[FILENAME_MAX];
if (!getcwd(currPath, sizeof(currPath))) {
return false;
}
currPath[sizeof(currPath) - 1] = '\0'; /* not really required */
return toAbsolute(std::string("file://" + std::string(currPath) + "/"));
}
std::string URLImpl::getLocalFilename(const std::string& suffix) {
if (_localFile.length() > 0)
return _localFile;
if (_uri.scheme().compare("file") == 0)
return _uri.path();
// try hard to find a temporary directory
const char* tmpDir = NULL;
if (tmpDir == NULL)
tmpDir = getenv("TMPDIR");
if (tmpDir == NULL)
tmpDir = getenv("TMP");
if (tmpDir == NULL)
tmpDir = getenv("TEMP");
if (tmpDir == NULL)
tmpDir = getenv("USERPROFILE");
if (tmpDir == NULL)
tmpDir = "/tmp";
char* tmpl = (char*)malloc(strlen(tmpDir) + 11 + suffix.length());
char* writePtr = tmpl;
memcpy(writePtr, tmpDir, strlen(tmpDir));
writePtr += strlen(tmpDir);
memcpy(writePtr, "scxmlXXXXXX", 11);
writePtr += 11;
memcpy(writePtr, suffix.c_str(), suffix.length());
writePtr += suffix.length();
tmpl[writePtr - tmpl] = 0;
#ifdef _WIN32
_mktemp_s(tmpl, strlen(tmpl) + 1);
int fd = _open(tmpl, _O_CREAT, _S_IREAD | _S_IWRITE);
#else
int fd = mkstemps(tmpl, suffix.length());
#endif
if (fd < 0) {
LOG(ERROR) << "mkstemp " << tmpl << ": " << strerror(errno) << std::endl;
return "";
}
#ifdef WIN32
_close(fd);
#else
close(fd);
#endif
return std::string(tmpl);
}
boost::shared_ptr<URLImpl> URLImpl::toLocalFile(const std::string& content, const std::string& suffix) {
boost::shared_ptr<URLImpl> urlImpl = boost::shared_ptr<URLImpl>(new URLImpl());
urlImpl->_localFile = urlImpl->getLocalFilename(suffix);
urlImpl->_uri = std::string("file://") + urlImpl->_localFile;
std::ofstream file(urlImpl->_localFile.c_str(), std::ios_base::out);
if(file.is_open()) {
file << content;
file.close();
} else {
return boost::shared_ptr<URLImpl>();
}
return urlImpl;
}
const bool URLImpl::toAbsolute(const std::string& baseUrl) {
if (_uri.is_absolute())
return true;
_uri = Arabica::io::URI(baseUrl, _uri.as_string());
if (!_uri.is_absolute())
return false;
return true;
}
const std::string URLImpl::asLocalFile(const std::string& suffix, bool reload) {
// this is already a local file
if (_uri.scheme().compare("file") == 0)
return _uri.path();
if (_localFile.length() > 0 && !reload)
return _localFile;
if (_localFile.length() > 0)
remove(_localFile.c_str());
_localFile = getLocalFilename(suffix);
std::ofstream file(_localFile.c_str(), std::ios_base::out);
if(file.is_open()) {
file << URL(this->shared_from_this());
file.close();
} else {
_localFile = "";
}
return _localFile;
}
std::ostream & operator<<(std::ostream & stream, const URL& url) {
std::string urlString = url.asString();
std::string fileURL = "file://";
// strip file:// to support relative filenames
if(urlString.substr(0, fileURL.size()) == fileURL) {
urlString = urlString.substr(fileURL.size());
#ifdef _WIN32
urlString = urlString.substr(0,1) + ":" + urlString.substr(1);
// std::replace( urlString.begin(), urlString.end(), '/', '\\');
#endif
}
// LOG(ERROR) << "Trying to open " << urlString;
URL_FILE *handle = url_fopen(urlString.c_str(), "r");
if(!handle) {
LOG(ERROR) << "Cannot open URL " << url.asString();
return stream;
}
int nread;
char buffer[256];
do {
nread = url_fread(buffer, 1,sizeof(buffer), handle);
stream.write(buffer, nread);
} while(nread);
url_fclose(handle);
return stream;
}
/* we use a global one for convenience */
CURLM *multi_handle;
/* curl calls this routine to get more data */
static size_t write_callback(char *buffer,
size_t size,
size_t nitems,
void *userp) {
char *newbuff;
size_t rembuff;
URL_FILE *url = (URL_FILE *)userp;
size *= nitems;
rembuff=url->buffer_len - url->buffer_pos; /* remaining space in buffer */
if(size > rembuff) {
/* not enough space in buffer */
newbuff=(char*)realloc(url->buffer,url->buffer_len + (size - rembuff));
if(newbuff==NULL) {
fprintf(stderr,"callback buffer grow failed\n");
size=rembuff;
} else {
/* realloc suceeded increase buffer size*/
url->buffer_len+=size - rembuff;
url->buffer=newbuff;
}
}
memcpy(&url->buffer[url->buffer_pos], buffer, size);
url->buffer_pos += size;
return size;
}
/* use to attempt to fill the read buffer up to requested number of bytes */
static int fill_buffer(URL_FILE *file, size_t want) {
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
struct timeval timeout;
int rc;
/* only attempt to fill buffer if transactions still running and buffer
* doesnt exceed required size already
*/
if((!file->still_running) || (file->buffer_pos > want))
return 0;
/* attempt to fill buffer */
do {
int maxfd = -1;
long curl_timeo = -1;
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_ZERO(&fdexcep);
/* set a suitable timeout to fail on */
timeout.tv_sec = 60; /* 1 minute */
timeout.tv_usec = 0;
curl_multi_timeout(multi_handle, &curl_timeo);
if(curl_timeo >= 0) {
timeout.tv_sec = curl_timeo / 1000;
if(timeout.tv_sec > 1)
timeout.tv_sec = 1;
else
timeout.tv_usec = (curl_timeo % 1000) * 1000;
}
/* get file descriptors from the transfers */
curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
/* In a real-world program you OF COURSE check the return code of the
function calls. On success, the value of maxfd is guaranteed to be
greater or equal than -1. We call select(maxfd + 1, ...), specially
in case of (maxfd == -1), we call select(0, ...), which is basically
equal to sleep. */
rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
switch(rc) {
case -1:
/* select error */
break;
case 0:
default:
/* timeout or readable/writable sockets */
curl_multi_perform(multi_handle, &file->still_running);
break;
}
} while(file->still_running && (file->buffer_pos < want));
return 1;
}
/* use to remove want bytes from the front of a files buffer */
static int use_buffer(URL_FILE *file,int want) {
/* sort out buffer */
if((file->buffer_pos - want) <=0) {
/* ditch buffer - write will recreate */
if(file->buffer)
free(file->buffer);
file->buffer=NULL;
file->buffer_pos=0;
file->buffer_len=0;
} else {
/* move rest down make it available for later */
memmove(file->buffer,
&file->buffer[want],
(file->buffer_pos - want));
file->buffer_pos -= want;
}
return 0;
}
URL_FILE *url_fopen(const char *url,const char *operation) {
/* this code could check for URLs or types in the 'url' and
basicly use the real fopen() for standard files */
URL_FILE *file;
(void)operation;
file = (URL_FILE*)malloc(sizeof(URL_FILE));
if(!file)
return NULL;
memset(file, 0, sizeof(URL_FILE));
if((file->handle.file=fopen(url,operation)))
file->type = CFTYPE_FILE; /* marked as URL */
else {
file->type = CFTYPE_CURL; /* marked as URL */
file->handle.curl = curl_easy_init();
curl_easy_setopt(file->handle.curl, CURLOPT_URL, url);
curl_easy_setopt(file->handle.curl, CURLOPT_WRITEDATA, file);
curl_easy_setopt(file->handle.curl, CURLOPT_VERBOSE, 0L);
curl_easy_setopt(file->handle.curl, CURLOPT_WRITEFUNCTION, write_callback);
if(!multi_handle)
multi_handle = curl_multi_init();
curl_multi_add_handle(multi_handle, file->handle.curl);
/* lets start the fetch */
curl_multi_perform(multi_handle, &file->still_running);
if((file->buffer_pos == 0) && (!file->still_running)) {
/* if still_running is 0 now, we should return NULL */
/* make sure the easy handle is not in the multi handle anymore */
curl_multi_remove_handle(multi_handle, file->handle.curl);
/* cleanup */
curl_easy_cleanup(file->handle.curl);
free(file);
file = NULL;
}
}
return file;
}
int url_fclose(URL_FILE *file) {
int ret=0;/* default is good return */
switch(file->type) {
case CFTYPE_FILE:
ret=fclose(file->handle.file); /* passthrough */
break;
case CFTYPE_CURL:
/* make sure the easy handle is not in the multi handle anymore */
curl_multi_remove_handle(multi_handle, file->handle.curl);
/* cleanup */
curl_easy_cleanup(file->handle.curl);
break;
default: /* unknown or supported type - oh dear */
ret=EOF;
errno=EBADF;
break;
}
if(file->buffer)
free(file->buffer);/* free any allocated buffer space */
free(file);
return ret;
}
int url_feof(URL_FILE *file) {
int ret=0;
switch(file->type) {
case CFTYPE_FILE:
ret=feof(file->handle.file);
break;
case CFTYPE_CURL:
if((file->buffer_pos == 0) && (!file->still_running))
ret = 1;
break;
default: /* unknown or supported type - oh dear */
ret=-1;
errno=EBADF;
break;
}
return ret;
}
size_t url_fread(void *ptr, size_t size, size_t nmemb, URL_FILE *file) {
size_t want;
switch(file->type) {
case CFTYPE_FILE:
want=fread(ptr,size,nmemb,file->handle.file);
break;
case CFTYPE_CURL:
want = nmemb * size;
fill_buffer(file,want);
/* check if theres data in the buffer - if not fill_buffer()
* either errored or EOF */
if(!file->buffer_pos)
return 0;
/* ensure only available data is considered */
if(file->buffer_pos < want)
want = file->buffer_pos;
/* xfer data to caller */
memcpy(ptr, file->buffer, want);
use_buffer(file,want);
want = want / size; /* number of items */
break;
default: /* unknown or supported type - oh dear */
want=0;
errno=EBADF;
break;
}
return want;
}
char *url_fgets(char *ptr, size_t size, URL_FILE *file) {
size_t want = size - 1;/* always need to leave room for zero termination */
size_t loop;
switch(file->type) {
case CFTYPE_FILE:
ptr = fgets(ptr,size,file->handle.file);
break;
case CFTYPE_CURL:
fill_buffer(file,want);
/* check if theres data in the buffer - if not fill either errored or
* EOF */
if(!file->buffer_pos)
return NULL;
/* ensure only available data is considered */
if(file->buffer_pos < want)
want = file->buffer_pos;
/*buffer contains data */
/* look for newline or eof */
for(loop=0; loop < want; loop++) {
if(file->buffer[loop] == '\n') {
want=loop+1;/* include newline */
break;
}
}
/* xfer data to caller */
memcpy(ptr, file->buffer, want);
ptr[want]=0;/* allways null terminate */
use_buffer(file,want);
break;
default: /* unknown or supported type - oh dear */
ptr=NULL;
errno=EBADF;
break;
}
return ptr;/*success */
}
void url_rewind(URL_FILE *file) {
switch(file->type) {
case CFTYPE_FILE:
rewind(file->handle.file); /* passthrough */
break;
case CFTYPE_CURL:
/* halt transaction */
curl_multi_remove_handle(multi_handle, file->handle.curl);
/* restart */
curl_multi_add_handle(multi_handle, file->handle.curl);
/* ditch buffer - write will recreate - resets stream pos*/
if(file->buffer)
free(file->buffer);
file->buffer=NULL;
file->buffer_pos=0;
file->buffer_len=0;
break;
default: /* unknown or supported type - oh dear */
break;
}
}
}
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