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#include "http.h"
#include "server.h"
#include "worker.h"
#include "client.h"
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
/* HTTP Response */
struct http_response *
http_response_init(struct worker *w, int code, const char *msg) {
/* create object */
struct http_response *r = calloc(1, sizeof(struct http_response));
r->code = code;
r->msg = msg;
r->w = w;
r->keep_alive = 0; /* default */
http_response_set_header(r, "Server", "Webdis");
/* Cross-Origin Resource Sharing, CORS. */
http_response_set_header(r, "Allow", "GET,POST,PUT,OPTIONS");
http_response_set_header(r, "Access-Control-Allow-Origin", "*");
http_response_set_header(r, "Access-Control-Allow-Headers", "*");
return r;
}
void
http_response_set_header(struct http_response *r, const char *k, const char *v) {
int i, pos = r->header_count;
size_t key_sz = strlen(k);
size_t val_sz = strlen(v);
for(i = 0; i < r->header_count; ++i) {
if(strncmp(r->headers[i].key, k, key_sz) == 0) {
pos = i;
/* free old value before replacing it. */
free(r->headers[i].key);
free(r->headers[i].val);
break;
}
}
/* extend array */
if(pos == r->header_count) {
r->headers = realloc(r->headers,
sizeof(struct http_header)*(r->header_count + 1));
r->header_count++;
}
/* copy key */
r->headers[pos].key = calloc(key_sz + 1, 1);
memcpy(r->headers[pos].key, k, key_sz);
r->headers[pos].key_sz = key_sz;
/* copy val */
r->headers[pos].val = calloc(val_sz + 1, 1);
memcpy(r->headers[pos].val, v, val_sz);
r->headers[pos].val_sz = val_sz;
if(!r->chunked && !strcmp(k, "Transfer-Encoding") && !strcmp(v, "chunked")) {
r->chunked = 1;
}
}
void
http_response_set_body(struct http_response *r, const char *body, size_t body_len) {
r->body = body;
r->body_len = body_len;
}
static void
http_response_cleanup(struct http_response *r, int fd, int success) {
int i;
/* cleanup buffer */
free(r->out);
if(!r->keep_alive || !success) {
/* Close fd is client doesn't support Keep-Alive. */
close(fd);
}
/* cleanup response object */
for(i = 0; i < r->header_count; ++i) {
free(r->headers[i].key);
free(r->headers[i].val);
}
free(r->headers);
free(r);
}
static void
http_can_write(int fd, short event, void *p) {
int ret;
struct http_response *r = p;
(void)event;
ret = write(fd, r->out + r->sent, r->out_sz - r->sent);
if(ret > 0)
r->sent += ret;
if(ret <= 0 || r->out_sz - r->sent == 0) { /* error or done */
http_response_cleanup(r, fd, (int)r->out_sz == r->sent ? 1 : 0);
} else { /* reschedule write */
http_schedule_write(fd, r);
}
}
void
http_schedule_write(int fd, struct http_response *r) {
if(r->w) { /* async */
event_set(&r->ev, fd, EV_WRITE, http_can_write, r);
event_base_set(r->w->base, &r->ev);
event_add(&r->ev, NULL);
} else { /* blocking */
http_can_write(fd, 0, r);
}
}
static char *
format_chunk(const char *p, size_t sz, size_t *out_sz) {
char *out, tmp[64];
int chunk_size;
/* calculate format size */
chunk_size = sprintf(tmp, "%x\r\n", (int)sz);
*out_sz = chunk_size + sz + 2;
out = malloc(*out_sz);
memcpy(out, tmp, chunk_size);
memcpy(out + chunk_size, p, sz);
memcpy(out + chunk_size + sz, "\r\n", 2);
return out;
}
void
http_response_write(struct http_response *r, int fd) {
char *p;
int i, ret;
/*r->keep_alive = 0;*/
r->out_sz = sizeof("HTTP/1.x xxx ")-1 + strlen(r->msg) + 2;
r->out = calloc(r->out_sz + 1, 1);
ret = sprintf(r->out, "HTTP/1.%d %d %s\r\n", (r->http_version?1:0), r->code, r->msg);
(void)ret;
p = r->out;
if(!r->chunked) {
if(r->code == 200 && r->body) {
char content_length[10];
sprintf(content_length, "%zd", r->body_len);
http_response_set_header(r, "Content-Length", content_length);
} else {
http_response_set_header(r, "Content-Length", "0");
}
}
for(i = 0; i < r->header_count; ++i) {
/* "Key: Value\r\n" */
size_t header_sz = r->headers[i].key_sz + 2 + r->headers[i].val_sz + 2;
r->out = realloc(r->out, r->out_sz + header_sz);
p = r->out + r->out_sz;
/* add key */
memcpy(p, r->headers[i].key, r->headers[i].key_sz);
p += r->headers[i].key_sz;
/* add ": " */
*(p++) = ':';
*(p++) = ' ';
/* add value */
memcpy(p, r->headers[i].val, r->headers[i].val_sz);
p += r->headers[i].val_sz;
/* add "\r\n" */
*(p++) = '\r';
*(p++) = '\n';
r->out_sz += header_sz;
if(strncasecmp("Connection", r->headers[i].key, r->headers[i].key_sz) == 0 &&
strncasecmp("Keep-Alive", r->headers[i].val, r->headers[i].val_sz) == 0) {
r->keep_alive = 1;
}
}
/* end of headers */
r->out = realloc(r->out, r->out_sz + 2);
memcpy(r->out + r->out_sz, "\r\n", 2);
r->out_sz += 2;
/* append body if there is one. */
if(r->body && r->body_len) {
char *tmp = (char*)r->body;
size_t tmp_len = r->body_len;
if(r->chunked) { /* replace body with formatted chunk */
tmp = format_chunk(r->body, r->body_len, &tmp_len);
}
r->out = realloc(r->out, r->out_sz + tmp_len);
memcpy(r->out + r->out_sz, tmp, tmp_len);
r->out_sz += tmp_len;
if(r->chunked) { /* need to free the chunk */
free(tmp);
}
}
/* send buffer to client */
r->sent = 0;
http_schedule_write(fd, r);
}
static void
http_response_set_connection_header(struct http_client *c, struct http_response *r) {
http_response_set_keep_alive(r, c->keep_alive);
}
/* Adobe flash cross-domain request */
void
http_crossdomain(struct http_client *c) {
struct http_response *resp = http_response_init(NULL, 200, "OK");
char out[] = "<?xml version=\"1.0\"?>\n"
"<!DOCTYPE cross-domain-policy SYSTEM \"http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd\">\n"
"<cross-domain-policy>\n"
"<allow-access-from domain=\"*\" />\n"
"</cross-domain-policy>\n";
resp->http_version = c->http_version;
http_response_set_connection_header(c, resp);
http_response_set_header(resp, "Content-Type", "application/xml");
http_response_set_body(resp, out, sizeof(out)-1);
http_response_write(resp, c->fd);
http_client_reset(c);
}
/* Simple error response */
void
http_send_error(struct http_client *c, short code, const char *msg) {
struct http_response *resp = http_response_init(NULL, code, msg);
resp->http_version = c->http_version;
http_response_set_connection_header(c, resp);
http_response_set_body(resp, NULL, 0);
http_response_write(resp, c->fd);
http_client_reset(c);
}
/**
* Set Connection field, either Keep-Alive or Close.
*/
void
http_response_set_keep_alive(struct http_response *r, int enabled) {
r->keep_alive = enabled;
if(enabled) {
http_response_set_header(r, "Connection", "Keep-Alive");
} else {
http_response_set_header(r, "Connection", "Close");
}
}
/* Response to HTTP OPTIONS */
void
http_send_options(struct http_client *c) {
struct http_response *resp = http_response_init(NULL, 200, "OK");
resp->http_version = c->http_version;
http_response_set_connection_header(c, resp);
http_response_set_header(resp, "Content-Type", "text/html");
http_response_set_header(resp, "Content-Length", "0");
http_response_write(resp, c->fd);
http_client_reset(c);
}
/**
* Write HTTP chunk.
*/
void
http_response_write_chunk(int fd, struct worker *w, const char *p, size_t sz) {
struct http_response *r = http_response_init(w, 0, NULL);
r->keep_alive = 1; /* chunks are always keep-alive */
/* format packet */
r->out = format_chunk(p, sz, &r->out_sz);
/* send async write */
http_schedule_write(fd, r);
}
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