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/**
*
* Static file server Ulfius callback
*
* Copyright 2017-2020 Nicolas Mora <mail@babelouest.org>
*
* Version 202020616
*
* The MIT License (MIT)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* struct static_file_config must be initialized with proper values
* files_path: path (relative or absolute) to the DocumentRoot folder
* url_prefix: prefix used to access the callback function
* mime_types: a struct _u_map filled with all the mime-types needed for a static file server
* redirect_on_404: redirct uri on error 404, if NULL, send 404
*
* example of mime-types used in Hutch:
* {
* key = ".html"
* value = "text/html"
* },
* {
* key = ".css"
* value = "text/css"
* },
* {
* key = ".js"
* value = "application/javascript"
* },
* {
* key = ".png"
* value = "image/png"
* },
* {
* key = ".jpg"
* value = "image/jpeg"
* },
* {
* key = ".jpeg"
* value = "image/jpeg"
* },
* {
* key = ".ttf"
* value = "font/ttf"
* },
* {
* key = ".woff"
* value = "font/woff"
* },
* {
* key = ".woff2"
* value = "font/woff2"
* },
* {
* key = ".map"
* value = "application/octet-stream"
* },
* {
* key = "*"
* value = "application/octet-stream"
* }
*
*/
#include <orcania.h>
#include <string.h>
#include <ulfius.h>
#include <yder.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) {
(void)(pos);
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, * real_path = NULL;
const char * content_type;
/*
* Comment this if statement if you don't access static files url from root dir, like /app
*/
if (request->callback_position > 0) {
return U_CALLBACK_CONTINUE;
} else 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);
real_path = realpath(file_path, NULL);
if (0 == o_strncmp(((struct _static_file_config *)user_data)->files_path, real_path, o_strlen(((struct _static_file_config *)user_data)->files_path))) {
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;
}
}
} 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);
free(real_path); // realpath uses malloc
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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