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#include "cethcan.h"
#include <event2/http.h>
#include <event2/http_struct.h>
#include <event2/buffer.h>
#include <openssl/sha.h>
#define LONGPOLLMAXWAIT 75 /* sec */
static struct evhttp *evhttp;
static struct can_user *cuhttp;
static struct event *evlongpollclear;
static int evb_json_add(const char *data, size_t size, void *arg)
{
struct evbuffer *buf = arg;
return evbuffer_add(buf, data, size);
}
static void http_json_basic(struct evhttp_request *req, void *arg)
{
struct evkeyvalq *outhdr = evhttp_request_get_output_headers(req);
struct evbuffer *out = evbuffer_new();
evhttp_add_header(outhdr, "Content-Type", "application/json; charset=utf-8");
json_t *jsout = json_object();
can_json(jsout, JSON_NORMAL);
json_dump_callback(jsout, evb_json_add, out, JSON_SORT_KEYS | JSON_INDENT(4));
json_decref(jsout);
evhttp_send_reply(req, 200, "OK", out);
evbuffer_free(out);
}
static void http_json_set(struct evhttp_request *req, void *arg)
{
struct evkeyvalq *outhdr = evhttp_request_get_output_headers(req);
struct evbuffer *out = evbuffer_new();
const char *cmd = evhttp_uri_get_query(req->uri_elems), *set;
char *e = NULL;
unsigned long cmdl, setl;
struct can_message msg;
if (!cmd || !(set = strchr(cmd, '=')) || set == cmd || set[1] == '\0')
goto out_inval;
cmdl = strtoul(cmd, &e, 0);
if (e != set)
goto out_inval;
setl = strtoul(set + 1, &e, 0);
if (*e || setl > 0xff)
goto out_inval;
msg.daddr = CANA_LIGHT_F(0, cmdl);
msg.dlc = 1;
msg.bytes[0] = setl;
can_broadcast(cuhttp, &msg);
evhttp_add_header(outhdr, "Content-Type", "text/plain; charset=utf-8");
evbuffer_add_printf(out, "ok %lu = %lu", cmdl, setl);
evhttp_send_reply(req, 200, "OK", out);
evbuffer_free(out);
return;
out_inval:
evbuffer_add_printf(out, "invalid request.");
evhttp_send_reply(req, 500, "Parameter missing", out);
evbuffer_free(out);
}
static void http_jsonrpc_response(void *arg, struct evbuffer *data)
{
struct evhttp_request *req = arg;
evhttp_send_reply_chunk(req, data);
evhttp_send_reply_end(req);
}
static void http_jsonrpc(struct evhttp_request *req, void *arg)
{
struct evkeyvalq *outhdr = evhttp_request_get_output_headers(req);
struct evbuffer *inp = evhttp_request_get_input_buffer(req);
if (evhttp_request_get_command(req) != EVHTTP_REQ_POST) {
evhttp_send_error(req, 405, "JSON-RPC request must be POSTed");
return;
}
evhttp_add_header(outhdr, "Content-Type", "application/json; charset=utf-8");
evhttp_send_reply_start(req, 200, "OK");
evhttp_request_own(req);
rpc_perform(inp, http_jsonrpc_response, req);
return;
}
static void http_json_bump(struct evhttp_request *req, void *arg)
{
struct evkeyvalq *outhdr = evhttp_request_get_output_headers(req);
struct evbuffer *out = evbuffer_new();
evhttp_add_header(outhdr, "Content-Type", "text/plain; charset=utf-8");
evbuffer_add_printf(out, "OK");
evhttp_send_reply(req, 200, "OK", out);
evbuffer_free(out);
json_bump_longpoll();
}
struct longpoll {
struct longpoll *next;
struct evhttp_request *req;
time_t added;
};
static struct longpoll *longpolls = NULL, **plongpoll = &longpolls;
static size_t longpoll_count = 0;
static char *longpollbuf = NULL;
static size_t longpollbuflen = 0;
static char longpollhash[SHA_DIGEST_LENGTH * 2 + 1] = "";
static void http_json_longpoll(struct evhttp_request *req, void *arg)
{
struct evkeyvalq *outhdr = evhttp_request_get_output_headers(req);
struct evbuffer *out;
struct longpoll *lp;
const char *query;
evhttp_add_header(outhdr, "Content-Type", "application/json; charset=utf-8");
query = evhttp_uri_get_query(evhttp_request_get_evhttp_uri(req));
if (query && !strcmp(query, longpollhash)) {
lprintf("long poll");
evhttp_send_reply_start(req, 200, "OK Long Poll");
evhttp_request_own(req);
lp = calloc(sizeof(*lp), 1);
lp->req = req;
lp->added = time(NULL);
*plongpoll = lp;
plongpoll = &lp->next;
longpoll_count++;
return;
}
out = evbuffer_new();
evbuffer_add(out, longpollbuf, longpollbuflen);
evhttp_send_reply(req, 200, "OK Short Poll", out);
evbuffer_free(out);
}
static void longpoll_updatedata(void)
{
json_t *jsout, *jswrap;
char *data;
unsigned char digest[SHA_DIGEST_LENGTH];
if (longpollbuf)
free(longpollbuf);
jsout = json_object();
can_json(jsout, JSON_LONGPOLL);
data = json_dumps(jsout, JSON_SORT_KEYS | JSON_INDENT(4));
SHA1((unsigned char *)data, strlen(data), digest);
free(data);
for (size_t i = 0; i < SHA_DIGEST_LENGTH; i++)
sprintf(longpollhash + i * 2, "%02x", digest[i]);
jswrap = json_object();
json_object_set_new(jswrap, "data", jsout);
json_object_set_new(jswrap, "ref", json_string(longpollhash));
longpollbuf = json_dumps(jswrap, JSON_SORT_KEYS | JSON_INDENT(4));
longpollbuflen = strlen(longpollbuf);
json_decref(jswrap);
}
void json_bump_longpoll(void)
{
struct longpoll *lp, *lpnext;
struct evbuffer *out;
longpoll_updatedata();
out = evbuffer_new();
for (lp = longpolls; lp; lp = lpnext) {
lpnext = lp->next;
evbuffer_add(out, longpollbuf, longpollbuflen);
evhttp_send_reply_chunk(lp->req, out);
/* send_reply_end calls request_free() */
evhttp_send_reply_end(lp->req);
free(lp);
}
evbuffer_free(out);
longpolls = NULL;
plongpoll = &longpolls;
longpoll_count = 0;
}
static void longpoll_clear(evutil_socket_t foo, short flags, void *arg)
{
struct longpoll *lp;
time_t now = time(NULL);
while (longpolls && longpolls->added < now - LONGPOLLMAXWAIT) {
lp = longpolls;
longpolls = lp->next;
longpoll_count--;
evhttp_send_reply_end(lp->req);
free(lp);
}
}
static void http_can_handler(void *arg, struct can_message *msg)
{
}
void http_init(void)
{
struct timeval tv;
cuhttp = can_register_alloc(NULL, http_can_handler, "http");
evhttp = evhttp_new(ev_base);
evhttp_set_cb(evhttp, "/", http_json_basic, NULL);
evhttp_set_cb(evhttp, "/subcan.json", http_json_basic, NULL);
evhttp_set_cb(evhttp, "/set", http_json_set, NULL);
evhttp_set_cb(evhttp, "/longpoll", http_json_longpoll, NULL);
evhttp_set_cb(evhttp, "/bump", http_json_bump, NULL);
evhttp_set_cb(evhttp, "/jsonrpc", http_jsonrpc, NULL);
evhttp_bind_socket(evhttp, "127.0.0.1", 34999);
longpoll_updatedata();
tv.tv_sec = 30;
tv.tv_usec = 0;
evlongpollclear = event_new(ev_base, -1, EV_PERSIST, longpoll_clear, NULL);
event_add(evlongpollclear, &tv);
}
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