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#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <cjson/cJSON.h>
#include <stdio.h>
#include "http.h"
#include "util.h"
#include "buffer.h"
struct http {
struct request_handler *requests;
size_t req_siz, n_requests;
};
struct request_handler {
char *method;
char *path;
void *data;
request_callback *callback;
};
struct header_item {
char *key;
char *value;
struct header_item *next;
};
bool parse_query(char *path, char **query) {
char *sep = strchr(path, '?');
if (!sep) {
*query = NULL;
return false;
}
*sep = '\0';
*query = strdup(sep + 1);
return true;
}
void add_header(struct header_list *list, char *header, char *value) {
size_t index = hash(header, MAX_HEADERS);
struct header_item to_insert = {0};
struct header_item *item = NULL;
to_insert.key = strdup(header);
to_insert.value = strdup(value);
if (!list->items[index]) {
list->items[index] = malloc(sizeof(struct header_item));
*(list->items[index]) = to_insert;
} else {
item = list->items[index];
while (item->next != NULL) {
item = item->next;
}
item->next = malloc(sizeof(struct header_item));
*(item->next) = to_insert;
}
}
const char *http_get_header(struct request *req, const char *key) {
size_t index = hash(key, MAX_HEADERS);
struct header_item *item = req->header.items[index];
while (item != NULL) {
if (strcmp(item->key, key) == 0) {
return item->value;
}
item = item->next;
}
return NULL;
}
enum parse_result {
PARSE_OK,
PARSE_ERR_UNSUPPORTED_HTTP_VERSION,
PARSE_MALFORMED_INPUT
};
static enum parse_result parse_request(struct request *req, const char *request) {
assert(req);
assert(request);
char *copy = strdup(request);
char *saveptr, *line;
char *path, *query;
char *header;
char *data = strstr(copy, "\r\n\r\n");
if (data) {
*data = '\0';
data += 4;
}
line = strtok_r(copy, "\r\n", &saveptr);
if (sscanf(line, "%ms %ms HTTP/%s", &req->method, &path, req->http_version) != 3) {
free(copy);
free(path);
free(req->method);
return PARSE_MALFORMED_INPUT;
}
if (parse_query(path, &query)) {
req->path = path;
req->query = query;
} else {
req->path = path;
req->query = strdup("");
}
for (line = strtok_r(NULL, "\r\n", &saveptr);
line != NULL && strlen(line) > 0;
line = strtok_r(NULL, "\r\n", &saveptr)) {
header = strchr(line, ':');
if (!header)
continue;
*(header++) = '\0';
while (*header == ' ')
header++;
add_header(&req->header, line, header);
}
if (data)
req->data = strdup(data);
return PARSE_OK;
}
struct buffer *http_build_reply(struct reply *reply) {
assert(reply);
struct buffer *buf = buf_new(NULL);
buf_printf(buf,
"HTTP/1.1 %d %s\r\n"
"Content-Length: %ld\r\n"
"Content-Type: %s\r\n"
"\r\n"
"%s",
reply->status, "OK", strlen(reply->body), "application/json", reply->body);
return buf;
}
struct reply *http_handle_request(struct http *http, struct buffer *req) {
struct request data = {0};
struct reply *ret = NULL;
if (parse_request(&data, req->data) != PARSE_OK) {
// todo: log
return NULL;
}
for (size_t i = 0; i < http->n_requests; i++) {
if (strcmp(data.method, http->requests[i].method) == 0 &&
strcmp(data.path, http->requests[i].path) == 0) {
ret = http->requests[i].callback(&data, http->requests[i].data);
}
}
if (!ret) {
ret = malloc(sizeof(struct reply));
ret->status = 404;
ret->body = strdup("");
}
return ret;
}
struct http *http_init(void) {
struct http *http = malloc(sizeof(struct http));
http->requests = malloc(sizeof(struct request_handler) * 5);
http->n_requests = 0;
http->req_siz = 5;
return http;
}
bool http_register_handler(struct http *http, char *method, char *path,
void *data, request_callback *callback) {
if (http->n_requests + 1 >= http->req_siz) {
http->req_siz += 10;
http->requests = realloc(http->requests,
sizeof(struct request_handler) * http->req_siz);
memset(http->requests, 0,
sizeof(struct request_handler) * (http->req_siz - http->n_requests));
}
struct request_handler *handle = &http->requests[http->n_requests++];
handle->method = strdup(method);
handle->path = strdup(path);
handle->data = data;
handle->callback = callback;
return true;
}
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