server.c

#include "server.h"
#include "http.h"
#include "file.h"

#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

void *handle_client(void *arg) {
    int client_fd = *((int *)arg);
    char *buffer = (char *)malloc(BUFFER_SIZE * sizeof(char));

    // receive request data from client and store into buffer
    ssize_t bytes_received = recv(client_fd, buffer, BUFFER_SIZE, 0);
    if (bytes_received > 0) {
        // check if request is GET
        regex_t regex;
        regcomp(&regex, "^GET /([^ ]*) HTTP/1", REG_EXTENDED);
        regmatch_t matches[2];

        if (regexec(&regex, buffer, 2, matches, 0) == 0) {
            // extract filename from request and decode URL
            buffer[matches[1].rm_eo] = '\0';
            const char *url_encoded_file_name = buffer + matches[1].rm_so;
            char *file_name = decode_url(url_encoded_file_name);

            // get file extension
            char file_ext[32];
            strcpy(file_ext, get_file_extension(file_name));

            // build HTTP response
            char *response = (char *)malloc(BUFFER_SIZE * 2 * sizeof(char));
            size_t response_len;
            build_http_response(file_name, file_ext, response, &response_len);

            // send HTTP response to client
            send(client_fd, response, response_len, 0);

            free(response);
            free(file_name);
        }
        regfree(&regex);
    }

    close(client_fd);
    free(arg);
    free(buffer);

    return NULL;
}