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nginx-push-stream-module
Commit f79baac0 authored by Wandenberg Peixoto's avatar Wandenberg Peixoto
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split validate channel code in function ngx_http_push_stream_validate_channels to be reusable

parent 57c6ff7d
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Showing with 86 additions and 63 deletions
include/ngx_http_push_stream_module_subscriber.h
View file @ f79baac0
......@@ -33,7 +33,8 @@ typedef struct {
} ngx_http_push_stream_requested_channel_t;
static ngx_int_t ngx_http_push_stream_subscriber_handler(ngx_http_request_t *r);
ngx_http_push_stream_requested_channel_t * ngx_http_push_stream_parse_channels_ids_from_path(ngx_http_request_t *r, ngx_pool_t *pool);
ngx_http_push_stream_requested_channel_t *ngx_http_push_stream_parse_channels_ids_from_path(ngx_http_request_t *r, ngx_pool_t *pool);
static ngx_int_t ngx_http_push_stream_validate_channels(ngx_http_request_t *r, ngx_http_push_stream_requested_channel_t *channels_ids, ngx_int_t *status_code, ngx_str_t **explain_error_message);
static void ngx_http_push_stream_subscriber_cleanup(ngx_http_push_stream_subscriber_cleanup_t *data);
......
src/ngx_http_push_stream_module_subscriber.c
View file @ f79baac0
......@@ -43,16 +43,13 @@ ngx_http_push_stream_subscriber_handler(ngx_http_request_t *r)
ngx_http_push_stream_subscriber_t *worker_subscriber;
ngx_http_push_stream_requested_channel_t *channels_ids, *cur;
ngx_pool_t *temp_pool;
ngx_uint_t subscribed_channels_qtd = 0;
ngx_uint_t subscribed_broadcast_channels_qtd = 0;
ngx_flag_t is_broadcast_channel;
ngx_http_push_stream_channel_t *channel;
time_t if_modified_since;
ngx_str_t *last_event_id;
ngx_str_t *push_mode;
ngx_flag_t polling, longpolling;
ngx_http_push_stream_main_conf_t *mcf = ngx_http_push_stream_module_main_conf;
ngx_int_t rc;
ngx_int_t status_code;
ngx_str_t *explain_error_message;
// only accept GET method
if (!(r->method & NGX_HTTP_GET)) {
......@@ -75,64 +72,9 @@ ngx_http_push_stream_subscriber_handler(ngx_http_request_t *r)
}
//validate channels: name, length and quantity. check if channel exists when authorized_channels_only is on. check if channel is full of subscribers
cur = channels_ids;
while ((cur = (ngx_http_push_stream_requested_channel_t *) ngx_queue_next(&cur->queue)) != channels_ids) {
// could not be ALL channel or contain wildcard
if ((ngx_memn2cmp(cur->id->data, NGX_HTTP_PUSH_STREAM_ALL_CHANNELS_INFO_ID.data, cur->id->len, NGX_HTTP_PUSH_STREAM_ALL_CHANNELS_INFO_ID.len) == 0) || (ngx_strchr(cur->id->data, '*') != NULL)) {
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_FORBIDDEN, &NGX_HTTP_PUSH_STREAM_NO_CHANNEL_ID_NOT_AUTHORIZED_MESSAGE);
}
// could not have a large size
if ((mcf->max_channel_id_length != NGX_CONF_UNSET_UINT) && (cur->id->len > mcf->max_channel_id_length)) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0, "push stream module: channel id is larger than allowed %d", cur->id->len);
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_BAD_REQUEST, &NGX_HTTP_PUSH_STREAM_TOO_LARGE_CHANNEL_ID_MESSAGE);
}
// count subscribed channel and broadcasts
subscribed_channels_qtd++;
is_broadcast_channel = 0;
if ((mcf->broadcast_channel_prefix.len > 0) && (ngx_strncmp(cur->id->data, mcf->broadcast_channel_prefix.data, mcf->broadcast_channel_prefix.len) == 0)) {
is_broadcast_channel = 1;
subscribed_broadcast_channels_qtd++;
}
// check if channel exists when authorized_channels_only is on
if (cf->authorized_channels_only && !is_broadcast_channel && (((channel = ngx_http_push_stream_find_channel(cur->id, r->connection->log)) == NULL) || (channel->stored_messages == 0))) {
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_FORBIDDEN, &NGX_HTTP_PUSH_STREAM_CANNOT_CREATE_CHANNELS);
}
// check if channel is full of subscribers
if ((mcf->max_subscribers_per_channel != NGX_CONF_UNSET_UINT) && (((channel = ngx_http_push_stream_find_channel(cur->id, r->connection->log)) != NULL) && (channel->subscribers >= mcf->max_subscribers_per_channel))) {
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_FORBIDDEN, &NGX_HTTP_PUSH_STREAM_TOO_SUBSCRIBERS_PER_CHANNEL);
}
}
// check if number of subscribed broadcast channels is acceptable
if ((cf->broadcast_channel_max_qtd != NGX_CONF_UNSET_UINT) && (subscribed_broadcast_channels_qtd > 0) && ((subscribed_broadcast_channels_qtd > cf->broadcast_channel_max_qtd) || (subscribed_broadcast_channels_qtd == subscribed_channels_qtd))) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "push stream module: max subscribed broadcast channels exceeded");
if (ngx_http_push_stream_validate_channels(r, channels_ids, &status_code, &explain_error_message) == NGX_ERROR) {
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_FORBIDDEN, &NGX_HTTP_PUSH_STREAM_TOO_MUCH_BROADCAST_CHANNELS);
}
// create the channels in advance, if doesn't exist, to ensure max number of channels in the server
cur = channels_ids;
while ((cur = (ngx_http_push_stream_requested_channel_t *) ngx_queue_next(&cur->queue)) != channels_ids) {
channel = ngx_http_push_stream_get_channel(cur->id, r->connection->log, cf);
if (channel == NULL) {
ngx_log_error(NGX_LOG_ERR, (r)->connection->log, 0, "push stream module: unable to allocate memory for new channel");
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_INTERNAL_SERVER_ERROR, NULL);
}
if (channel == NGX_HTTP_PUSH_STREAM_NUMBER_OF_CHANNELS_EXCEEDED) {
ngx_log_error(NGX_LOG_ERR, (r)->connection->log, 0, "push stream module: number of channels were exceeded");
ngx_destroy_pool(temp_pool);
return ngx_http_push_stream_send_only_header_response(r, NGX_HTTP_FORBIDDEN, &NGX_HTTP_PUSH_STREAM_NUMBER_OF_CHANNELS_EXCEEDED_MESSAGE);
}
return ngx_http_push_stream_send_only_header_response(r, status_code, explain_error_message);
}
// get control headers
......@@ -423,6 +365,86 @@ ngx_http_push_stream_parse_channels_ids_from_path(ngx_http_request_t *r, ngx_poo
return channels_ids;
}
static ngx_int_t
ngx_http_push_stream_validate_channels(ngx_http_request_t *r, ngx_http_push_stream_requested_channel_t *channels_ids, ngx_int_t *status_code, ngx_str_t **explain_error_message)
{
ngx_http_push_stream_main_conf_t *mcf = ngx_http_push_stream_module_main_conf;
ngx_http_push_stream_loc_conf_t *cf = ngx_http_get_module_loc_conf(r, ngx_http_push_stream_module);
ngx_http_push_stream_requested_channel_t *cur = channels_ids;
ngx_uint_t subscribed_channels_qtd = 0;
ngx_uint_t subscribed_broadcast_channels_qtd = 0;
ngx_flag_t is_broadcast_channel;
ngx_http_push_stream_channel_t *channel;
while ((cur = (ngx_http_push_stream_requested_channel_t *) ngx_queue_next(&cur->queue)) != channels_ids) {
// could not be ALL channel or contain wildcard
if ((ngx_memn2cmp(cur->id->data, NGX_HTTP_PUSH_STREAM_ALL_CHANNELS_INFO_ID.data, cur->id->len, NGX_HTTP_PUSH_STREAM_ALL_CHANNELS_INFO_ID.len) == 0) || (ngx_strchr(cur->id->data, '*') != NULL)) {
*status_code = NGX_HTTP_FORBIDDEN;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_NO_CHANNEL_ID_NOT_AUTHORIZED_MESSAGE;
return NGX_ERROR;
}
// could not have a large size
if ((mcf->max_channel_id_length != NGX_CONF_UNSET_UINT) && (cur->id->len > mcf->max_channel_id_length)) {
ngx_log_error(NGX_LOG_WARN, r->connection->log, 0, "push stream module: channel id is larger than allowed %d", cur->id->len);
*status_code = NGX_HTTP_BAD_REQUEST;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_TOO_LARGE_CHANNEL_ID_MESSAGE;
return NGX_ERROR;
}
// count subscribed channel and broadcasts
subscribed_channels_qtd++;
is_broadcast_channel = 0;
if ((mcf->broadcast_channel_prefix.len > 0) && (ngx_strncmp(cur->id->data, mcf->broadcast_channel_prefix.data, mcf->broadcast_channel_prefix.len) == 0)) {
is_broadcast_channel = 1;
subscribed_broadcast_channels_qtd++;
}
// check if channel exists when authorized_channels_only is on
if (cf->authorized_channels_only && !is_broadcast_channel && (((channel = ngx_http_push_stream_find_channel(cur->id, r->connection->log)) == NULL) || (channel->stored_messages == 0))) {
*status_code = NGX_HTTP_FORBIDDEN;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_CANNOT_CREATE_CHANNELS;
return NGX_ERROR;
}
// check if channel is full of subscribers
if ((mcf->max_subscribers_per_channel != NGX_CONF_UNSET_UINT) && (((channel = ngx_http_push_stream_find_channel(cur->id, r->connection->log)) != NULL) && (channel->subscribers >= mcf->max_subscribers_per_channel))) {
*status_code = NGX_HTTP_FORBIDDEN;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_TOO_SUBSCRIBERS_PER_CHANNEL;
return NGX_ERROR;
}
}
// check if number of subscribed broadcast channels is acceptable
if ((cf->broadcast_channel_max_qtd != NGX_CONF_UNSET_UINT) && (subscribed_broadcast_channels_qtd > 0) && ((subscribed_broadcast_channels_qtd > cf->broadcast_channel_max_qtd) || (subscribed_broadcast_channels_qtd == subscribed_channels_qtd))) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "push stream module: max subscribed broadcast channels exceeded");
*status_code = NGX_HTTP_FORBIDDEN;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_TOO_MUCH_BROADCAST_CHANNELS;
return NGX_ERROR;
}
// create the channels in advance, if doesn't exist, to ensure max number of channels in the server
cur = channels_ids;
while ((cur = (ngx_http_push_stream_requested_channel_t *) ngx_queue_next(&cur->queue)) != channels_ids) {
channel = ngx_http_push_stream_get_channel(cur->id, r->connection->log, cf);
if (channel == NULL) {
ngx_log_error(NGX_LOG_ERR, (r)->connection->log, 0, "push stream module: unable to allocate memory for new channel");
*status_code = NGX_HTTP_INTERNAL_SERVER_ERROR;
*explain_error_message = NULL;
return NGX_ERROR;
}
if (channel == NGX_HTTP_PUSH_STREAM_NUMBER_OF_CHANNELS_EXCEEDED) {
ngx_log_error(NGX_LOG_ERR, (r)->connection->log, 0, "push stream module: number of channels were exceeded");
*status_code = NGX_HTTP_FORBIDDEN;
*explain_error_message = (ngx_str_t *) &NGX_HTTP_PUSH_STREAM_NUMBER_OF_CHANNELS_EXCEEDED_MESSAGE;
return NGX_ERROR;
}
}
return NGX_OK;
}
static void
ngx_http_push_stream_subscriber_cleanup(ngx_http_push_stream_subscriber_cleanup_t *data)
{
......
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