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/**
@file rexmpp_http_upload.c
@brief XEP-0363: HTTP file upload
@author defanor <defanor@uberspace.net>
@date 2021
@copyright MIT license.
*/
#include <syslog.h>
#include <string.h>
#include <libgen.h>
#include <errno.h>
#include <stdlib.h>
#include "config.h"
#ifdef HAVE_CURL
#include <curl/curl.h>
#endif
#include "rexmpp.h"
#include "rexmpp_xml.h"
#include "rexmpp_http_upload.h"
#ifdef HAVE_CURL
void rexmpp_upload_task_finish (struct rexmpp_http_upload_task *task) {
task->cb(task->s, task->cb_data, task->get_url);
free(task->fname);
if (task->fh != NULL) {
fclose(task->fh);
}
if (task->content_type != NULL) {
free(task->content_type);
}
if (task->get_url != NULL) {
free(task->get_url);
}
if (task->http_headers != NULL) {
curl_slist_free_all(task->http_headers);
}
free(task);
}
void rexmpp_http_upload_slot_cb (rexmpp_t *s,
void *ptr,
rexmpp_xml_t *request,
rexmpp_xml_t *response,
int success)
{
(void)request;
struct rexmpp_http_upload_task *task = ptr;
if (success) {
rexmpp_xml_t *slot = rexmpp_xml_find_child(response, "urn:xmpp:http:upload:0", "slot");
rexmpp_xml_t *put = rexmpp_xml_find_child(slot, "urn:xmpp:http:upload:0", "put");
rexmpp_xml_t *get = rexmpp_xml_find_child(slot, "urn:xmpp:http:upload:0", "get");
if (put != NULL && get != NULL) {
const char *put_url = rexmpp_xml_find_attr_val(put, "url");
const char *get_url = rexmpp_xml_find_attr_val(get, "url");
if (put_url != NULL && get_url != NULL) {
task->get_url = strdup(get_url);
CURL *ce = curl_easy_init();
curl_easy_setopt(ce, CURLOPT_PRIVATE, task);
curl_easy_setopt(ce, CURLOPT_UPLOAD, 1);
curl_easy_setopt(ce, CURLOPT_READDATA, task->fh);
curl_easy_setopt(ce, CURLOPT_URL, put_url);
curl_easy_setopt(ce, CURLOPT_INFILESIZE, task->fsize);
rexmpp_xml_t *header = rexmpp_xml_first_elem_child(put);
while (header) {
const char *header_name = rexmpp_xml_find_attr_val(header, "name");
if (header_name != NULL) {
const char *header_str = rexmpp_xml_text_child(header);
if (header_str != NULL) {
size_t full_header_str_len =
strlen(header_name) + 3 + strlen(header_str);
char *full_header_str = malloc(full_header_str_len);
if (full_header_str != NULL) {
snprintf(full_header_str, full_header_str_len, "%s: %s",
header_name, header_str);
task->http_headers =
curl_slist_append(task->http_headers, full_header_str);
free(full_header_str);
} else {
rexmpp_log(s, LOG_ERR,
"Failed to allocate memory for a header");
}
}
}
header = rexmpp_xml_next_elem_sibling(header);
}
curl_easy_setopt(ce, CURLOPT_HTTPHEADER, task->http_headers);
curl_multi_add_handle(s->curl_multi, ce);
rexmpp_log(s, LOG_DEBUG, "Uploading %s to %s", task->fname, put_url);
return;
} else {
rexmpp_log(s, LOG_ERR, "Unexpected structure for a HTTP file upload slot.");
}
} else {
rexmpp_log(s, LOG_ERR, "Unexpected structure for a HTTP file upload slot.");
}
} else {
rexmpp_log(s, LOG_ERR, "Failed to obtain a slot for HTTP file upload.");
}
rexmpp_upload_task_finish(task);
}
void rexmpp_http_upload_feature_cb (rexmpp_t *s,
void *ptr,
rexmpp_xml_t *request,
rexmpp_xml_t *response,
int success)
{
(void)response;
struct rexmpp_http_upload_task *task = ptr;
if (! success) {
rexmpp_log(s, LOG_ERR, "No HTTP file upload service found.");
rexmpp_upload_task_finish(task);
return;
}
rexmpp_xml_t *req =
rexmpp_xml_new_elem("request", "urn:xmpp:http:upload:0");
rexmpp_xml_add_attr(req, "filename", task->fname);
char buf[11];
snprintf(buf, 11, "%u", task->fsize);
rexmpp_xml_add_attr(req, "size", buf);
if (task->content_type) {
rexmpp_xml_add_attr(req, "content-type", task->content_type);
}
const char *to = rexmpp_xml_find_attr_val(request, "to");
rexmpp_iq_new(s, "get", to, req, rexmpp_http_upload_slot_cb, task);
}
rexmpp_err_t
rexmpp_http_upload (rexmpp_t *s,
const char *jid,
const char *fname,
size_t fsize,
FILE *fh,
const char *content_type,
http_upload_cb cb,
void *cb_data)
{
if (fname == NULL) {
rexmpp_log(s, LOG_ERR, "No file name is provided");
fclose(fh);
return REXMPP_E_PARAM;
}
struct rexmpp_http_upload_task *task =
malloc(sizeof(struct rexmpp_http_upload_task));
if (task == NULL) {
rexmpp_log(s, LOG_ERR, "Failed to allocate memory for an upload task");
fclose(fh);
return REXMPP_E_MALLOC;
}
task->fname = strdup(fname);
task->fsize = fsize;
task->fh = fh;
task->content_type = content_type ? strdup(content_type) : NULL;
task->get_url = NULL;
task->http_headers = NULL;
task->cb = cb;
task->cb_data = cb_data;
task->s = s;
return rexmpp_disco_find_feature(s, jid, "urn:xmpp:http:upload:0",
rexmpp_http_upload_feature_cb, task, 0, 20);
}
#else
rexmpp_err_t
rexmpp_http_upload (rexmpp_t *s,
const char *jid,
const char *fname,
size_t fsize,
FILE *fh,
const char *content_type,
http_upload_cb cb,
void *cb_data)
{
(void)jid;
(void)fname;
(void)fsize;
(void)content_type;
rexmpp_log(s, LOG_ERR, "rexmpp is built without curl support");
fclose(fh);
cb(s, cb_data, NULL);
return REXMPP_E_OTHER;
}
#endif
rexmpp_err_t
rexmpp_http_upload_path (rexmpp_t *s,
const char *jid,
char *fpath,
const char *content_type,
http_upload_cb cb,
void *cb_data)
{
FILE *fh = fopen(fpath, "rb");
if (fh == NULL) {
rexmpp_log(s, LOG_ERR, "Failed to open %s for reading: %s.\n",
fpath, strerror(errno));
cb(s, cb_data, NULL);
return REXMPP_E_OTHER;
}
char *fname = basename(fpath);
fseek(fh, 0, SEEK_END);
long fsize = ftell(fh);
fseek(fh, 0, SEEK_SET);
return
rexmpp_http_upload(s, jid, fname, fsize, fh, content_type, cb, cb_data);
}
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