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#include "client.h"
#include "http_parser.h"
#include "http.h"
#include "server.h"
#include "worker.h"
#include "websocket.h"
#include "cmd.h"
#include "conf.h"

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <hiredis/hiredis.h>
#include <hiredis/async.h>

#define CHECK_ALLOC(c, ptr) if(!(ptr)) { c->failed_alloc = 1; return -1;}

static int
http_client_on_url(struct http_parser *p, const char *at, size_t sz) {

struct http_client *c = p->data;

CHECK_ALLOC(c, c->path = realloc(c->path, c->path_sz + sz + 1));
memcpy(c->path + c->path_sz, at, sz);
c->path_sz += sz;
c->path[c->path_sz] = 0;

return 0;
}

/*
* Called when the body is parsed.
*/
static int
http_client_on_body(struct http_parser *p, const char *at, size_t sz) {

struct http_client *c = p->data;
return http_client_add_to_body(c, at, sz);
}

int
http_client_add_to_body(struct http_client *c, const char *at, size_t sz) {

CHECK_ALLOC(c, c->body = realloc(c->body, c->body_sz + sz + 1));
memcpy(c->body + c->body_sz, at, sz);
c->body_sz += sz;
c->body[c->body_sz] = 0;

return 0;
}

static int
http_client_on_header_name(struct http_parser *p, const char *at, size_t sz) {

struct http_client *c = p->data;
size_t n = c->header_count;

/* if we're not adding to the same header name as last time, realloc to add one field. */
if(c->last_cb != LAST_CB_KEY) {
n = ++c->header_count;
CHECK_ALLOC(c, c->headers = realloc(c->headers, n * sizeof(struct http_header)));
memset(&c->headers[n-1], 0, sizeof(struct http_header));
}

/* Add data to the current header name. */
CHECK_ALLOC(c, c->headers[n-1].key = realloc(c->headers[n-1].key,
c->headers[n-1].key_sz + sz + 1));
memcpy(c->headers[n-1].key + c->headers[n-1].key_sz, at, sz);
c->headers[n-1].key_sz += sz;
c->headers[n-1].key[c->headers[n-1].key_sz] = 0;

c->last_cb = LAST_CB_KEY;

return 0;
}

static char *
wrap_filename(const char *val, size_t val_len) {

char format[] = "attachment; filename=\"";
size_t sz = sizeof(format) - 1 + val_len + 1;
char *p = calloc(sz + 1, 1);

memcpy(p, format, sizeof(format)-1); /* copy format */
memcpy(p + sizeof(format)-1, val, val_len); /* copy filename */
p[sz-1] = '"';

return p;
}

/*
* Split query string into key/value pairs, process some of them.
*/
static int
http_client_on_query_string(struct http_parser *parser, const char *at, size_t sz) {

struct http_client *c = parser->data;
const char *p = at;

while(p < at + sz) {

const char *key = p, *val;
int key_len, val_len;
char *eq = memchr(key, '=', sz - (p-at));
if(!eq || eq > at + sz) { /* last argument */
break;
} else { /* found an '=' */
char *amp;
val = eq + 1;
key_len = eq - key;
p = eq + 1;

amp = memchr(p, '&', sz - (p-at));
if(!amp || amp > at + sz) {
val_len = at + sz - p; /* last arg */
} else {
val_len = amp - val; /* cur arg */
p = amp + 1;
}

if(key_len == 4 && strncmp(key, "type", 4) == 0) {
c->type = calloc(1 + val_len, 1);
memcpy(c->type, val, val_len);
} else if((key_len == 5 && strncmp(key, "jsonp", 5) == 0)
|| (key_len == 8 && strncmp(key, "callback", 8) == 0)) {
c->jsonp = calloc(1 + val_len, 1);
memcpy(c->jsonp, val, val_len);
} else if(key_len == 3 && strncmp(key, "sep", 3) == 0) {
c->separator = calloc(1 + val_len, 1);
memcpy(c->separator, val, val_len);
} else if(key_len == 8 && strncmp(key, "filename", 8) == 0) {
c->filename = wrap_filename(val, val_len);
}

if(!amp) {
break;
}
}
}
return 0;
}

static int
http_client_on_header_value(struct http_parser *p, const char *at, size_t sz) {

struct http_client *c = p->data;
size_t n = c->header_count;

/* Add data to the current header value. */
CHECK_ALLOC(c, c->headers[n-1].val = realloc(c->headers[n-1].val,
c->headers[n-1].val_sz + sz + 1));
memcpy(c->headers[n-1].val + c->headers[n-1].val_sz, at, sz);
c->headers[n-1].val_sz += sz;
c->headers[n-1].val[c->headers[n-1].val_sz] = 0;

c->last_cb = LAST_CB_VAL;


/* react to some values. */
if(strncmp("Expect", c->headers[n-1].key, c->headers[n-1].key_sz) == 0) {
if(sz == 12 && strncasecmp(at, "100-continue", sz) == 0) {
/* support HTTP file upload */
char http100[] = "HTTP/1.1 100 Continue\r\n\r\n";
int ret = write(c->fd, http100, sizeof(http100)-1);
(void)ret;
}
} else if(strncasecmp("Connection", c->headers[n-1].key, c->headers[n-1].key_sz) == 0) {
if(sz == 10 && strncasecmp(at, "Keep-Alive", sz) == 0) {
c->keep_alive = 1;
}
}

return 0;
}

static int
http_client_on_message_complete(struct http_parser *p) {

struct http_client *c = p->data;

/* keep-alive detection */
if(c->parser.http_major == 1 && c->parser.http_minor == 1) { /* 1.1 */
c->keep_alive = 1;
}
c->http_version = c->parser.http_minor;

if(p->upgrade && c->w->s->cfg->websockets) { /* WebSocket, don't execute just yet */
c->is_websocket = 1;
return 0;
}

/* handle default root object */
if(c->path_sz == 1 && *c->path == '/' && c->w->s->cfg->default_root) { /* replace */
free(c->path);
c->path = strdup(c->w->s->cfg->default_root);
c->path_sz = strlen(c->path);
}


worker_process_client(c);
http_client_reset(c);

return 0;
}

struct http_client *
http_client_new(struct worker *w, int fd, in_addr_t addr) {

struct http_client *c = calloc(1, sizeof(struct http_client));

c->fd = fd;
c->w = w;
c->addr = addr;
c->s = w->s;

/* parser */
http_parser_init(&c->parser, HTTP_REQUEST);
c->parser.data = c;

/* callbacks */
c->settings.on_url = http_client_on_url;
c->settings.on_query_string = http_client_on_query_string;
c->settings.on_body = http_client_on_body;
c->settings.on_message_complete = http_client_on_message_complete;
c->settings.on_header_field = http_client_on_header_name;
c->settings.on_header_value = http_client_on_header_value;

c->last_cb = LAST_CB_NONE;

return c;
}


void
http_client_reset(struct http_client *c) {

int i;

/* headers */
for(i = 0; i < c->header_count; ++i) {
free(c->headers[i].key);
free(c->headers[i].val);
}
free(c->headers);
c->headers = NULL;
c->header_count = 0;

/* other data */
free(c->body); c->body = NULL;
c->body_sz = 0;
free(c->path); c->path = NULL;
c->path_sz = 0;
free(c->type); c->type = NULL;
free(c->jsonp); c->jsonp = NULL;
free(c->filename); c->filename = NULL;
c->request_sz = 0;

/* no last known header callback */
c->last_cb = LAST_CB_NONE;

/* mark as broken if client doesn't support Keep-Alive. */
if(c->keep_alive == 0) {
c->broken = 1;
}
}

void
http_client_free(struct http_client *c) {

http_client_reset(c);
free(c->buffer);
free(c);
}

int
http_client_read(struct http_client *c) {

char buffer[4096];
int ret;

ret = read(c->fd, buffer, sizeof(buffer));
if(ret <= 0) {
/* broken link, free buffer and client object */

/* disconnect pub/sub client if there is one. */
if(c->pub_sub && c->pub_sub->ac) {
struct cmd *cmd = c->pub_sub;

/* disconnect from all channels */
redisAsyncDisconnect(c->pub_sub->ac);
if(c->pub_sub) c->pub_sub->ac = NULL;
c->pub_sub = NULL;

/* delete command object */
cmd_free(cmd);
}

close(c->fd);

http_client_free(c);
return (int)CLIENT_DISCONNECTED;
}

/* save what we've just read */
c->buffer = realloc(c->buffer, c->sz + ret);
if(!c->buffer) {
return (int)CLIENT_OOM;
}
memcpy(c->buffer + c->sz, buffer, ret);
c->sz += ret;

/* keep track of total sent */
c->request_sz += ret;

return ret;
}

int
http_client_remove_data(struct http_client *c, size_t sz) {

char *buffer;
if(c->sz < sz)
return -1;

/* replace buffer */
CHECK_ALLOC(c, buffer = malloc(c->sz - sz));
memcpy(buffer, c->buffer + sz, c->sz - sz);
free(c->buffer);
c->buffer = buffer;
c->sz -= sz;

return 0;
}

int
http_client_execute(struct http_client *c) {

int nparsed = http_parser_execute(&c->parser, &c->settings, c->buffer, c->sz);

if(!c->is_websocket) {
/* removed consumed data, all has been copied already. */
free(c->buffer);
c->buffer = NULL;
c->sz = 0;
}
return nparsed;
}

/*
* Find header value, returns NULL if not found.
*/
const char *
client_get_header(struct http_client *c, const char *key) {

int i;
size_t sz = strlen(key);

for(i = 0; i < c->header_count; ++i) {

if(sz == c->headers[i].key_sz &&
strncasecmp(key, c->headers[i].key, sz) == 0) {
return c->headers[i].val;
}

}

return NULL;
}

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