nchan_msg_id_t *nchan_subscriber_get_msg_id(ngx_http_request_t *r) {
static nchan_msg_id_t id = NCHAN_ZERO_MSGID;
ngx_str_t *if_none_match;
nchan_loc_conf_t *cf = ngx_http_get_module_loc_conf(r, nchan_module);
int i;
if(!cf->msg_in_etag_only && r->headers_in.if_modified_since != NULL) {
id.time=ngx_http_parse_time(r->headers_in.if_modified_since->value.data, r->headers_in.if_modified_since->value.len);
if_none_match = nchan_subscriber_get_etag(r);
if(if_none_match==NULL) {
id.tagcount=1;
id.tagactive=0;
}
else {
nchan_parse_msg_tag(if_none_match->data, if_none_match->data + if_none_match->len, &id);
}
return &id;
}
else if(cf->msg_in_etag_only && (if_none_match = nchan_subscriber_get_etag(r)) != NULL) {
if(nchan_parse_compound_msgid(&id, if_none_match) == NGX_OK) {
return &id;
}
}
else {
nchan_complex_value_arr_t *alt_msgid_cv_arr = &cf->last_message_id;
u_char buf[128];
ngx_str_t str;
ngx_int_t rc;
int n = alt_msgid_cv_arr->n;
str.len = 0;
str.data = buf;
for(i=0; i < n; i++) {
rc = ngx_http_complex_value_noalloc(r, alt_msgid_cv_arr->cv[i], &str, 128);
if(str.len > 0 && rc == NGX_OK) {
if(nchan_parse_compound_msgid(&id, &str) == NGX_OK) {
return &id;
}
}
}
}
//eh, we didn't find a valid alt_msgid value from variables. use the defaults
id.time = cf->subscriber_start_at_oldest_message ? 0 : -1;
id.tagcount=1;
id.tagactive=0;
id.tag.fixed[0] = 0;
return &id;
}
static ngx_int_t subscribe_intervalpoll_callback(nchan_msg_status_t msg_search_outcome, nchan_msg_t *msg, ngx_http_request_t *r) {
//inefficient, but close enough for now
ngx_str_t *etag;
char *err;
switch(msg_search_outcome) {
case MSG_EXPECTED:
//interval-polling subscriber requests get a 304 with their entity tags preserved.
if (r->headers_in.if_modified_since != NULL) {
r->headers_out.last_modified_time=ngx_http_parse_time(r->headers_in.if_modified_since->value.data, r->headers_in.if_modified_since->value.len);
}
if ((etag=nchan_subscriber_get_etag(r)) != NULL) {
nchan_add_response_header(r, &NCHAN_HEADER_ETAG, etag);
}
nchan_respond_status(r, NGX_HTTP_NOT_MODIFIED, NULL, 1);
break;
case MSG_FOUND:
if(nchan_respond_msg(r, msg, NULL, 1, &err) != NGX_OK) {
nchan_respond_cstring(r, NGX_HTTP_INTERNAL_SERVER_ERROR, &TEXT_PLAIN, err, 1);
}
break;
case MSG_NOTFOUND:
case MSG_EXPIRED:
nchan_respond_status(r, NGX_HTTP_NOT_FOUND, NULL, 1);
break;
default:
nchan_respond_status(r, NGX_HTTP_INTERNAL_SERVER_ERROR, NULL, 1);
return NGX_ERROR;
}
return NGX_DONE;
}
static ngx_int_t nchan_subscriber_get_msg_id(ngx_http_request_t *r, nchan_msg_id_t *id) {
static ngx_str_t last_event_id_header = ngx_string("Last-Event-ID");
ngx_str_t *last_event_id;
ngx_str_t *if_none_match;
if((last_event_id = nchan_get_header_value(r, last_event_id_header)) != NULL) {
u_char *split, *last;
ngx_int_t time;
//"<msg_time>:<msg_tag>"
last = last_event_id->data + last_event_id->len;
if((split = ngx_strlchr(last_event_id->data, last, ':')) != NULL) {
time = ngx_atoi(last_event_id->data, split - last_event_id->data);
split++;
if(time != NGX_ERROR) {
id->time = time;
nchan_parse_msg_tag(split, last, id);
return NGX_OK;
}
}
}
if_none_match = nchan_subscriber_get_etag(r);
id->time=(r->headers_in.if_modified_since == NULL) ? 0 : ngx_http_parse_time(r->headers_in.if_modified_since->value.data, r->headers_in.if_modified_since->value.len);
if(if_none_match==NULL) {
int i;
for(i=0; i< NCHAN_MULTITAG_MAX; i++) {
id->tag[i]=0;
}
id->tagcount=1;
}
else {
nchan_parse_msg_tag(if_none_match->data, if_none_match->data + if_none_match->len, id);
}
return NGX_OK;
}
nchan_msg_id_t *nchan_subscriber_get_msg_id(ngx_http_request_t *r) {
static nchan_msg_id_t id = NCHAN_ZERO_MSGID;
ngx_str_t *if_none_match;
nchan_loc_conf_t *cf = ngx_http_get_module_loc_conf(r, ngx_nchan_module);
nchan_request_ctx_t *ctx = ngx_http_get_module_ctx(r, ngx_nchan_module);
int i;
ngx_int_t rc;
if_none_match = nchan_subscriber_get_etag(r);
if(!cf->msg_in_etag_only && r->headers_in.if_modified_since != NULL) {
id.time=ngx_http_parse_time(r->headers_in.if_modified_since->value.data, r->headers_in.if_modified_since->value.len);
if(id.time <= 0) { //anything before 1-1-1970 is reserved and treated as no msgid provided
set_default_id(cf, &id);
return &id;
}
u_char *first = NULL, *last = NULL;
if(if_none_match != NULL) {
first = if_none_match->data;
last = if_none_match->data + if_none_match->len;
}
if(nchan_parse_msg_tag(first, last, &id, ctx->channel_id_count) == NGX_ERROR) {
return NULL;
}
return &id;
}
else if((cf->msg_in_etag_only || r->headers_in.if_modified_since == NULL) && if_none_match) {
rc = nchan_parse_compound_msgid(&id, if_none_match, ctx->channel_id_count);
if(rc == NGX_OK) {
return &id;
}
else if(rc == NGX_ERROR) {
return NULL;
}
}
else {
nchan_complex_value_arr_t *alt_msgid_cv_arr = &cf->last_message_id;
u_char buf[128];
ngx_str_t str;
int n = alt_msgid_cv_arr->n;
ngx_int_t rc2;
str.len = 0;
str.data = buf;
for(i=0; i < n; i++) {
rc = ngx_http_complex_value_noalloc(r, alt_msgid_cv_arr->cv[i], &str, 128);
if(str.len > 0 && rc == NGX_OK) {
rc2 = nchan_parse_compound_msgid(&id, nchan_urldecode_str(r, &str), ctx->channel_id_count);
if(rc2 == NGX_OK) {
return &id;
}
else if(rc2 == NGX_ERROR) {
return NULL;
}
}
}
}
set_default_id(cf, &id);
return &id;
}
