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client.c
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client.c
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#include <stdio.h> /* printf, sprintf */
#include <stdlib.h> /* exit, atoi, malloc, free */
#include <unistd.h> /* read, write, close */
#include <string.h> /* memcpy, memset */
#include <sys/socket.h> /* socket, connect */
#include <netinet/in.h> /* struct sockaddr_in, struct sockaddr */
#include <netdb.h> /* struct hostent, gethostbyname */
#include <arpa/inet.h>
#include "helpers.h"
#include "requests.h"
#include "parson/parson.h"
#define SERVER_HOST "34.254.242.81"
#define SERVER_PORT 8080
#define PAYLOAD_TYPE "application/json"
#define PATH_REGISTER "/api/v1/tema/auth/register"
#define PATH_LOGIN "/api/v1/tema/auth/login"
#define PATH_LOGOUT "/api/v1/tema/auth/logout"
#define PATH_ACCESS "/api/v1/tema/library/access"
#define PATH_BOOKS "/api/v1/tema/library/books"
#define MAX_STDIN 256
#define MAX 1000
char* get_user_infos() {
char *username;
char *password;
char *serialized_string;
/* Allocate memory for the data */
username = calloc(MAX_STDIN, sizeof(char));
password = calloc(MAX_STDIN, sizeof(char));
serialized_string = calloc(MAX_STDIN, sizeof(char));
/* Read the username and password */
printf("username=");
fgets(username, MAX_STDIN, stdin);
printf("password=");
fgets(password, MAX_STDIN, stdin);
if (strchr(username, ' ') != NULL) {
return NULL;
}
/* Remove the new line from the end of the strings */
username[strlen(username) - 1] = '\0';
password[strlen(password) - 1] = '\0';
/* Create the JSON object */
JSON_Value *root_value = json_value_init_object();
JSON_Object *root_object = json_value_get_object(root_value);
/* Add the username and password to the JSON object */
json_object_set_string(root_object, "username", username);
json_object_set_string(root_object, "password", password);
/* Convert the JSON object to string */
serialized_string = json_serialize_to_string_pretty(root_value);
/* Free the memory */
free(username);
free(password);
json_value_free(root_value);
return serialized_string;
}
char* get_id() {
char *id;
/* Allocate memory for the data */
id = calloc(MAX_STDIN, sizeof(char));
/* Read the id */
printf("id=");
fgets(id, MAX_STDIN, stdin);
/* Remove the new line from the end of the string */
id[strlen(id) - 1] = '\0';
return id;
}
int main(int argc, char *argv[])
{
char *message;
char *response;
char *command;
char *cookie = NULL;
char *token = NULL;
int sockfd;
while(1) {
/* Read the input from the user */
command = calloc(MAX_STDIN, sizeof(char));
fgets(command, MAX_STDIN, stdin);
/* Open the connection with the server */
sockfd = open_connection(SERVER_HOST, SERVER_PORT, PF_INET, SOCK_STREAM, 0);
/* The program is closing */
if (!strcmp(command, "exit\n")) {
/* Close the connection with the server */
close_connection(sockfd);
break;
/* Perform the registration */
} else if (!strcmp(command, "register\n")) {
char *serialized_string;
/* Get the user infos */
serialized_string = get_user_infos();
if (serialized_string == NULL) {
printf("[ERROR] The username cannot contain spaces!\n");
continue;
}
/* Create the POST request */
message = compute_post_request(
SERVER_HOST,
PATH_REGISTER,
PAYLOAD_TYPE,
&serialized_string, 0,
NULL, NULL);
/* Send the POST request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the username is taken */
if (strstr(response, "{\"error\":\"The username") != NULL) {
printf("[ERROR] The username is taken!\n");
continue;
}
/* Print the response */
printf("User registered successfully!\n");
json_free_serialized_string(serialized_string);
/* Perform login */
} else if (!strcmp(command, "login\n")) {
char *serialized_string;
/* Get the user infos */
serialized_string = get_user_infos();
if (serialized_string == NULL) {
printf("[ERROR] The username cannot contain spaces!\n");
continue;
}
/* Create the POST request */
message = compute_post_request(
SERVER_HOST,
PATH_LOGIN,
PAYLOAD_TYPE,
&serialized_string, 0,
NULL, NULL);
/* Send the POST request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the credentials do not match */
if (strstr(response, "{\"error\":\"Credentials are not good!\"}") != NULL) {
printf("[ERROR] - Log-in failed! The credentials do not match.\n");
continue;
}
/* Print the response */
printf("Welcome!\n");
/* Get the cookie */
cookie = strtok(strstr(response, "Set-Cookie:"), " ");
cookie = strtok(NULL, ";");
token = NULL;
json_free_serialized_string(serialized_string);
/* Perform logout */
} else if (!strcmp(command, "logout\n")) {
/* Create the GET request */
message = compute_get_request(
SERVER_HOST,
PATH_LOGOUT,
NULL,
cookie, token);
/* Send the request to the server */
send_to_server(sockfd, message);
/* Receive the response from the server */
response = receive_from_server(sockfd);
/* Check if the logout was successful */
if (strstr(response, "{\"error\":\"You are not logged in!\"}") != NULL) {
printf("[ERROR] You are not logged in!\n");
continue;
}
/* Print the response */
printf("Goodbye!:( You are now logged out\n");
/* Eliminate the cookie and the token */
cookie = NULL;
token = NULL;
/* Request access to the library */
} else if (!strcmp(command, "enter_library\n")) {
/* Create the GET request */
message = compute_get_request(
SERVER_HOST,
PATH_ACCESS,
NULL,
cookie, NULL);
/* Send the request to the server */
send_to_server(sockfd, message);
/* Receive the response from the server */
response = receive_from_server(sockfd);
/* Check if the access was denied */
if (strstr(response, "{\"error\":\"You are not logged in!\"}") != NULL) {
printf("[ERROR] You did not get access to the library.\n");
continue;
}
/* Print the response */
printf("You get access to the library.\n");
/* Get the token */
token = strtok(strstr(response, "token"), ":");
token = strtok(NULL, "\"");
/* Request all books from the server */
} else if (!strcmp(command, "get_books\n")) {
/* Create the GET request */
message = compute_get_request(
SERVER_HOST,
PATH_BOOKS,
NULL,
cookie, token);
/* Send the request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the client has access to the library */
if (strstr(response, "{\"error\":\"Authorization header is missing!\"}") != NULL) {
printf("[ERROR] You do not have access to the library.\n");
continue;
}
/* Print the wanted result */
char *result = strchr(response, '[');
JSON_Value *root_value = json_parse_string(result);
JSON_Array *root_array = json_value_get_array(root_value);
if (json_array_get_count(root_array) == 0) {
printf("There are no books in the library.\n");
continue;
}
for (int i = 0; i < json_array_get_count(root_array); i++) {
JSON_Object *root_object = json_array_get_object(root_array, i);
const int id = json_object_get_number(root_object, "id");
const char *title = json_object_get_string(root_object, "title");
printf("Book nr. #%d\nid=%d\ntitle=%s\n\n", i + 1, id, title);
}
json_value_free(root_value);
/* Request information about a book */
} else if (!strcmp(command, "get_book\n")) {
char *id;
/* Get the ID from the user */
id = get_id();
/* Check if the user entered the ID */
if (strlen(id) == 0) {
printf("[ERROR] The ID was not entered.\n");
continue;
}
/* Create the access path */
char access_path[50] = "/api/v1/tema/library/books/";
strcat(access_path, id);
/* Create the GET request */
message = compute_get_request(
SERVER_HOST,
access_path,
NULL,
cookie, token);
/* Send the request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the client has access to the library */
if (strstr(response, "{\"error\":\"Authorization header is missing!\"}") != NULL) {
printf("[ERROR] You do not have access to the library.\n");
continue;
}
/* Check if the ID is valid */
if (strstr(response, "{\"error\":\"id is not int!\"}") != NULL) {
printf("[ERROR] The ID is not valid. Try a number.\n");
continue;
}
/* Check if the book was not found */
if (strstr(response, "{\"error\":\"No book was found!\"}") != NULL) {
printf("[ERROR] The book was not found.\n");
continue;
}
/* Print the wanted result */
char *result = strchr(response, '{');
JSON_Value *root_value = json_parse_string(result);
JSON_Object *root_object = json_value_get_object(root_value);
const char *title = json_object_get_string(root_object, "title");
const char *author = json_object_get_string(root_object, "author");
const char *genre = json_object_get_string(root_object, "genre");
const char *publisher = json_object_get_string(root_object, "publisher");
const int page_count = json_object_get_number(root_object, "page_count");
printf("title=%s\n", title);
printf("author=%s\n", author);
printf("genre=%s\n", genre);
printf("publisher=%s\n", publisher);
printf("page_count=%d\n", page_count);
json_value_free(root_value);
free(id);
/* Add a book */
} else if (!strcmp(command, "add_book\n")) {
char *title;
char *author;
char *genre;
char *publisher;
char *page_count;
/* Allocate memory for the data */
title = calloc(MAX_STDIN, sizeof(char));
author = calloc(MAX_STDIN, sizeof(char));
genre = calloc(MAX_STDIN, sizeof(char));
publisher = calloc(MAX_STDIN, sizeof(char));
page_count = calloc(MAX_STDIN, sizeof(char));
/* Read the data from the user */
printf("title=");
fgets(title, MAX_STDIN, stdin);
printf("author=");
fgets(author, MAX_STDIN, stdin);
printf("genre=");
fgets(genre, MAX_STDIN, stdin);
printf("publisher=");
fgets(publisher, MAX_STDIN, stdin);
printf("page_count=");
fgets(page_count, MAX_STDIN, stdin);
/* Check if the user entered all the data */
if (strlen(title) == 1 ||
strlen(author) == 1 ||
strlen(genre) == 1 ||
strlen(publisher) == 1 ||
strlen(page_count) == 1) {
printf("[ERROR] You did not enter all the data.\n");
continue;
}
/* Remove the \n from the end of the string */
title[strlen(title) - 1] = '\0';
author[strlen(author) - 1] = '\0';
genre[strlen(genre) - 1] = '\0';
publisher[strlen(publisher) - 1] = '\0';
page_count[strlen(page_count) - 1] = '\0';
/* Create the json */
JSON_Value *json_value = json_value_init_object();;
JSON_Object *json_object = json_value_get_object(json_value);
json_object_set_string(json_object, "title", title);
json_object_set_string(json_object, "author", author);
json_object_set_string(json_object, "genre", genre);
json_object_set_string(json_object, "publisher", publisher);
json_object_set_string(json_object, "page_count", page_count);
char *serialized_string = json_serialize_to_string_pretty(json_value);
/* Create the POST request */
message = compute_post_request(
SERVER_HOST,
PATH_BOOKS,
PAYLOAD_TYPE,
&serialized_string, 0,
cookie, token);
/* Send the request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the client has access to the library */
if (strstr(response, "{\"error\":\"Authorization header is missing!\"}") != NULL) {
printf("[ERROR] You do not have access to the library.\n");
continue;
}
/* Check if the entered information is incomplete or
does not comply with the formatting. */
if (strstr(response, "{\"error\":\"Something Bad Happened\"}") != NULL) {
printf("[ERROR] The entered information is incomplete or does not comply with the formatting.\n");
continue;
}
/* Print the response */
printf("The book was succesfully added to the library.\n");
json_free_serialized_string(serialized_string);
json_value_free(json_value);
free(title);
free(author);
free(genre);
free(publisher);
free(page_count);
/* Delete a book */
} else if (!strcmp(command, "delete_book\n")) {
char *id;
/* Get the ID from the user */
id = get_id();
/* Check if the user entered the ID */
if (strlen(id) == 0) {
printf("[ERROR] The ID was not entered.\n");
continue;
}
/* Update the access path */
char access_path[50] = "/api/v1/tema/library/books/";
strcat(access_path, id);
/* Create the DELETE request */
message = compute_delete_request(
SERVER_HOST,
access_path,
token);
/* Send the request */
send_to_server(sockfd, message);
/* Receive the response */
response = receive_from_server(sockfd);
/* Check if the client has access to the library */
if (strstr(response, "{\"error\":\"Authorization header is missing!\"}") != NULL) {
printf("[ERROR] You do not have access to the library.\n");
continue;
}
/* Check if the entered information is incomplete or
does not comply with the formatting. */
if (strstr(response, "{\"error\":\"Something Bad Happened\"}") != NULL) {
printf("[ERROR] The entered information is incomplete or does not comply with the formatting.\n");
continue;
}
/* Check if the book was deleted */
if (strstr(response, "{\"error\":\"No book was deleted!\"}") != NULL) {
printf("[ERROR] The book does not exist.\n");
continue;
}
/* Print the response */
printf("The book was successfully deleted from library\n");
free(id);
} else {
printf("[ERROR] Invalid command.\n");
}
/* Close the connection with the server */
close_connection(sockfd);
free(command);
}
return 0;
}