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/**
*
* Static file server Ulfius callback
*
* Copyright 2017-2018 Nicolas Mora <mail@babelouest.org>
*
* Version 20181110
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* License as published by the Free Software Foundation;
* version 3 of the License.
*
* 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <ulfius.h>
#include "static_file_callback.h"
/**
* Return the filename extension
*/
const char * get_filename_ext(const char *path) {
const char *dot = strrchr(path, '.');
if(!dot || dot == path) return "*";
if (strchr(dot, '?') != NULL) {
*strchr(dot, '?') = '\0';
}
return dot;
}
/**
* Streaming callback function to ease sending large files
*/
static ssize_t callback_static_file_stream(void * cls, uint64_t pos, char * buf, size_t max) {
if (cls != NULL) {
return fread (buf, 1, max, (FILE *)cls);
} else {
return U_STREAM_END;
}
}
/**
* Cleanup FILE* structure when streaming is complete
*/
static void callback_static_file_stream_free(void * cls) {
if (cls != NULL) {
fclose((FILE *)cls);
}
}
/**
* static file callback endpoint
*/
int callback_static_file (const struct _u_request * request, struct _u_response * response, void * user_data) {
size_t length;
FILE * f;
char * file_requested, * file_path, * url_dup_save;
const char * content_type;
/*
* Comment this if statement if you put static files url not in root, like /app
*/
if (response->shared_data != NULL) {
return U_CALLBACK_CONTINUE;
}
if (user_data != NULL && ((struct _static_file_config *)user_data)->files_path != NULL) {
file_requested = o_strdup(request->http_url);
url_dup_save = file_requested;
while (file_requested[0] == '/') {
file_requested++;
}
file_requested += o_strlen(((struct _static_file_config *)user_data)->url_prefix);
while (file_requested[0] == '/') {
file_requested++;
}
if (strchr(file_requested, '#') != NULL) {
*strchr(file_requested, '#') = '\0';
}
if (strchr(file_requested, '?') != NULL) {
*strchr(file_requested, '?') = '\0';
}
if (file_requested == NULL || o_strlen(file_requested) == 0 || 0 == o_strcmp("/", file_requested)) {
o_free(url_dup_save);
url_dup_save = file_requested = o_strdup("index.html");
}
file_path = msprintf("%s/%s", ((struct _static_file_config *)user_data)->files_path, file_requested);
if (access(file_path, F_OK) != -1) {
f = fopen (file_path, "rb");
if (f) {
fseek (f, 0, SEEK_END);
length = ftell (f);
fseek (f, 0, SEEK_SET);
content_type = u_map_get_case(((struct _static_file_config *)user_data)->mime_types, get_filename_ext(file_requested));
if (content_type == NULL) {
content_type = u_map_get(((struct _static_file_config *)user_data)->mime_types, "*");
y_log_message(Y_LOG_LEVEL_WARNING, "Static File Server - Unknown mime type for extension %s", get_filename_ext(file_requested));
}
u_map_put(response->map_header, "Content-Type", content_type);
u_map_copy_into(response->map_header, ((struct _static_file_config *)user_data)->map_header);
if (ulfius_set_stream_response(response, 200, callback_static_file_stream, callback_static_file_stream_free, length, STATIC_FILE_CHUNK, f) != U_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "callback_static_file - Error ulfius_set_stream_response");
}
}
} else {
if (((struct _static_file_config *)user_data)->redirect_on_404 == NULL) {
ulfius_set_string_body_response(response, 404, "File not found");
} else {
ulfius_add_header_to_response(response, "Location", ((struct _static_file_config *)user_data)->redirect_on_404);
response->status = 302;
}
}
o_free(file_path);
o_free(url_dup_save);
return U_CALLBACK_CONTINUE;
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "Static File Server - Error, user_data is NULL or inconsistent");
return U_CALLBACK_ERROR;
}
}
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