http-server-in-c/http_stuff.c

#include "http_stuff.h"

http_request* create_http_request() {
    http_request* req = (http_request*)malloc(sizeof(http_request));
    req->method = NULL;
    req->url = NULL;
    req->num_headers = 0;
    req->headers = NULL;
    req->content_type = NULL;
    req->content_length = 0;
    req->body = NULL;
    return req;
}

http_response* create_http_response() {
    http_response* res = (http_response*)malloc(sizeof(http_response));
    res->status_line = NULL;
    res->num_headers = 0;
    res->headers = NULL;
    res->content_type = NULL;
    res->content_length = 0;
    res->body = NULL;
    return res;
}

http_request* free_http_request(http_request* req) {
    free(req->method);
    free(req->url);
    free(req->headers);
    free(req->content_type);
    free(req->body);
    free(req);
    return NULL;
}

http_response* free_http_response(http_response* res) {
    free(res->status_line);
    free(res->headers);
    free(res->content_type);
    free(res->body);
    free(res);
    return NULL;
}

void print_http_request(http_request* req) {
    printf("Method: %s\n", req->method);
    printf("URL: %s\n", req->url);
    printf("Headers:\n");
    for (int i = 0; i < req->num_headers; i++) {
        printf("%s: %s\n", req->headers[i].key, req->headers[i].value);
    }
    printf("Content-Type: %s\n", req->content_type);
    printf("Content-Length: %zu\n", req->content_length);
    printf("Body:\n%s\n", req->body);
}

void print_http_response(http_response* res) {
    printf("Status Line: %s\n", res->status_line);
    printf("Headers:\n");
    for (int i = 0; i < res->num_headers; i++) {
        printf("%s: %s\n", res->headers[i].key, res->headers[i].value);
    }
    printf("Content-Type: %s\n", res->content_type);
    printf("Content-Length: %zu\n", res->content_length);
    printf("Body:\n%s\n", res->body);
}

char* reponse_to_string(http_response* res) {
    int total_length = 0;
    int len_newline = strlen("\r\n");
    int len_crlf = strlen("\r\n\r\n");

    total_length += strlen(res->status_line);
    total_length += len_newline;
    for (int i = 0; i < res->num_headers; i++) {
        total_length += strlen(res->headers[i].key);
        total_length += strlen(": ");
        total_length += strlen(res->headers[i].value);
        total_length += len_newline;
    }
    total_length += strlen(res->content_type);
    total_length += len_crlf;
    total_length += strlen(res->body);
    total_length += len_crlf;
    total_length += 1;  // For null terminator

    char* response = (char*)malloc(total_length);
    strcpy(response, res->status_line);
    for (int i = 0; i < res->num_headers; i++) {
        strcat(response, res->headers[i].key);
        strcat(response, ": ");
        strcat(response, res->headers[i].value);
        strcat(response, "\r\n");
    }
    strcat(response, res->content_type);
    strcat(response, "\r\n\r\n");
    strcat(response, res->body);
    strcat(response, "\r\n\r\n");
    return response;
}

char* get_header_value_request(http_request* req, char* key) {
    for (int i = 0; i < req->num_headers; i++) {
        if (strcmp(req->headers[i].key, key) == 0) {
            return req->headers[i].value;
        }
    }
    return NULL;
}