smcp_status_t
smcp_variable_node_request_handler(
smcp_variable_node_t node
) {
// TODO: Make this function use less stack space!
smcp_method_t method = smcp_inbound_get_code();
smcp_status_t ret = SMCP_STATUS_NOT_FOUND;
SMCP_NON_RECURSIVE coap_content_type_t content_type;
SMCP_NON_RECURSIVE char* content_ptr;
SMCP_NON_RECURSIVE size_t content_len;
SMCP_NON_RECURSIVE char buffer[SMCP_VARIABLE_MAX_VALUE_LENGTH+1];
SMCP_NON_RECURSIVE coap_content_type_t reply_content_type;
uint8_t key_index = BAD_KEY_INDEX;
size_t value_len;
bool needs_prefix = true;
char* prefix_name = "";
content_type = smcp_inbound_get_content_type();
content_ptr = (char*)smcp_inbound_get_content_ptr();
content_len = smcp_inbound_get_content_len();
reply_content_type = SMCP_CONTENT_TYPE_APPLICATION_FORM_URLENCODED;
require(node, bail);
// Look up the key index.
if(smcp_inbound_peek_option(NULL,&value_len)==COAP_OPTION_URI_PATH) {
if(!value_len) {
needs_prefix = false;
smcp_inbound_next_option(NULL,NULL);
} else for(key_index=0;key_index<BAD_KEY_INDEX;key_index++) {
ret = node->func(node,SMCP_VAR_GET_KEY,key_index,buffer);
require_action(ret==0,bail,ret=SMCP_STATUS_NOT_FOUND);
if(smcp_inbound_option_strequal(COAP_OPTION_URI_PATH, buffer)) {
smcp_inbound_next_option(NULL,NULL);
break;
}
}
}
{
coap_option_key_t key;
const uint8_t* value;
while((key=smcp_inbound_next_option(&value, &value_len))!=COAP_OPTION_INVALID) {
require_action(key!=COAP_OPTION_URI_PATH,bail,ret=SMCP_STATUS_NOT_FOUND);
if(key==COAP_OPTION_URI_QUERY) {
if( method == COAP_METHOD_POST
&& value_len>=2
&& strhasprefix_const((const char*)value,"v=")
) {
DEBUG_PRINTF("variable-node: value is in the query.");
content_type = COAP_CONTENT_TYPE_TEXT_PLAIN;
content_ptr = (char*)value+2;
content_len = value_len-2;
}
// } else if(key==COAP_OPTION_ETAG) {
// } else if(key==COAP_OPTION_IF_MATCH) {
// } else if(key==COAP_OPTION_IF_NONE_MATCH) {
} else if(key==COAP_OPTION_ACCEPT) {
reply_content_type = 0;
if(value_len==1)
reply_content_type = value[0];
else {
// Unsupported type.
}
} else if(COAP_OPTION_IS_CRITICAL(key)) {
ret=SMCP_STATUS_BAD_OPTION;
assert_printf("Unrecognized option %d, \"%s\"",
key,
coap_option_key_to_cstr(key, false)
);
goto bail;
}
}
}
// TODO: Implement me!
if(method == COAP_METHOD_PUT)
method = COAP_METHOD_POST;
if(method == COAP_METHOD_POST) {
require_action(!smcp_inbound_is_dupe(),bail,ret=0);
require_action(
key_index!=BAD_KEY_INDEX,
bail,
ret=SMCP_STATUS_NOT_ALLOWED
);
if(content_type==SMCP_CONTENT_TYPE_APPLICATION_FORM_URLENCODED) {
char* key = NULL;
char* value = NULL;
content_len = 0;
while(
url_form_next_value(
(char**)&content_ptr,
&key,
&value
)
&& key
&& value
) {
if(strequal_const(key, "v")) {
content_ptr = value;
content_len = strlen(value);
break;
}
}
}
// Make sure our content is zero terminated.
((char*)content_ptr)[content_len] = 0;
ret = node->func(node,SMCP_VAR_SET_VALUE,key_index,(char*)content_ptr);
require_noerr(ret,bail);
ret = smcp_outbound_begin_response(COAP_RESULT_204_CHANGED);
require_noerr(ret,bail);
ret = smcp_outbound_send();
require_noerr(ret,bail);
} else if(method == COAP_METHOD_GET) {
if(key_index==BAD_KEY_INDEX) {
char* content_end_ptr;
ret = smcp_outbound_begin_response(COAP_RESULT_205_CONTENT);
require_noerr(ret,bail);
smcp_outbound_add_option_uint(COAP_OPTION_CONTENT_TYPE, COAP_CONTENT_TYPE_APPLICATION_LINK_FORMAT);
ret = smcp_observable_update(&node->observable, SMCP_OBSERVABLE_BROADCAST_KEY);
check_string(ret==0,smcp_status_to_cstr(ret));
content_ptr = smcp_outbound_get_content_ptr(&content_len);
content_end_ptr = content_ptr+content_len;
for(key_index=0;key_index<BAD_KEY_INDEX;key_index++) {
ret = node->func(node,SMCP_VAR_GET_KEY,key_index,buffer);
if(ret) break;
if(content_ptr+2>=content_end_ptr) {
// No more room for content.
break;
}
*content_ptr++ = '<';
if(needs_prefix) {
content_ptr += url_encode_cstr(content_ptr, prefix_name, (content_end_ptr-content_ptr)-1);
content_ptr = stpncpy(content_ptr,"/",MIN(1,(content_end_ptr-content_ptr)-1));
}
content_ptr += url_encode_cstr(content_ptr, buffer, (content_end_ptr-content_ptr)-1);
*content_ptr++ = '>';
ret = node->func(node,SMCP_VAR_GET_VALUE,key_index,buffer);
if(content_ptr+4>=content_end_ptr) {
// No more room for content.
break;
}
if(!ret) {
strcpy(content_ptr,";v=");
content_ptr += 3;
content_ptr += quoted_cstr(content_ptr, buffer, (content_end_ptr-content_ptr)-1);
}
ret = node->func(node,SMCP_VAR_GET_LF_TITLE,key_index,buffer);
if(content_ptr+8>=content_end_ptr) {
// No more room for content.
break;
}
if(!ret) {
strcpy(content_ptr,";title=");
content_ptr += 7;
content_ptr += quoted_cstr(content_ptr, buffer, (content_end_ptr-content_ptr)-1);
}
// Observation flag
if(0==node->func(node,SMCP_VAR_GET_OBSERVABLE,key_index,NULL)) {
content_ptr = stpncpy(content_ptr,";obs",MIN(4,(content_end_ptr-content_ptr)-1));
}
*content_ptr++ = ',';
}
ret = smcp_outbound_set_content_len(content_len-(content_end_ptr-content_ptr));
require_noerr(ret,bail);
ret = smcp_outbound_send();
} else {
size_t replyContentLength = 0;
char *replyContent;
ret = smcp_outbound_begin_response(COAP_RESULT_205_CONTENT);
require_noerr(ret,bail);
if(0==node->func(node,SMCP_VAR_GET_OBSERVABLE,key_index,buffer)) {
ret = smcp_observable_update(&node->observable, key_index);
check_string(ret==0,smcp_status_to_cstr(ret));
}
if(reply_content_type == SMCP_CONTENT_TYPE_APPLICATION_FORM_URLENCODED) {
uint32_t etag;
if(0==node->func(node,SMCP_VAR_GET_MAX_AGE,key_index,buffer)) {
#if HAVE_STRTOL
uint32_t max_age = strtol(buffer,NULL,0)&0xFFFFFF;
#else
uint32_t max_age = atoi(buffer)&0xFFFFFF;
#endif
smcp_outbound_add_option_uint(COAP_OPTION_MAX_AGE, max_age);
}
ret = node->func(node,SMCP_VAR_GET_VALUE,key_index,buffer);
require_noerr(ret,bail);
fasthash_start(0);
fasthash_feed((const uint8_t*)buffer,strlen(buffer));
etag = fasthash_finish_uint32();
smcp_outbound_add_option_uint(COAP_OPTION_CONTENT_TYPE, SMCP_CONTENT_TYPE_APPLICATION_FORM_URLENCODED);
smcp_outbound_add_option_uint(COAP_OPTION_ETAG, etag);
replyContent = smcp_outbound_get_content_ptr(&replyContentLength);
*replyContent++ = 'v';
*replyContent++ = '=';
replyContentLength -= 2;
replyContentLength = url_encode_cstr(
replyContent,
buffer,
replyContentLength
);
ret = smcp_outbound_set_content_len(replyContentLength+2);
} else {
ret = node->func(node,SMCP_VAR_GET_VALUE,key_index,buffer);
require_noerr(ret,bail);
ret = smcp_outbound_append_content(buffer, SMCP_CSTR_LEN);
}
require_noerr(ret,bail);
ret = smcp_outbound_send();
}
} else {
ret = smcp_default_request_handler(
(void*)node
);
check_string(ret == SMCP_STATUS_OK, smcp_status_to_cstr(ret));
}
bail:
check_string(ret == SMCP_STATUS_OK, smcp_status_to_cstr(ret));
return ret;
}
smcp_status_t
smcp_node_route(smcp_node_t node, smcp_request_handler_func* func, void** context) {
smcp_status_t ret = 0;
smcp_t const self = smcp_get_current_instance();
smcp_inbound_reset_next_option();
{
// TODO: Rewrite this to be more efficient.
const uint8_t* prev_option_ptr = self->inbound.this_option;
coap_option_key_t prev_key = 0;
coap_option_key_t key;
const uint8_t* value;
coap_size_t value_len;
while ((key = smcp_inbound_next_option(&value, &value_len)) != COAP_OPTION_INVALID) {
if (key > COAP_OPTION_URI_PATH) {
self->inbound.this_option = prev_option_ptr;
self->inbound.last_option_key = prev_key;
break;
} else if (key == COAP_OPTION_URI_PATH) {
smcp_node_t next = smcp_node_find(
node,
(const char*)value,
(int)value_len
);
if (next) {
node = next;
} else {
self->inbound.this_option = prev_option_ptr;
self->inbound.last_option_key = prev_key;
break;
}
} else if(key==COAP_OPTION_URI_HOST) {
// Skip host at the moment,
// because we don't do virtual hosting yet.
} else if(key==COAP_OPTION_URI_PORT) {
// Skip port at the moment,
// because we don't do virtual hosting yet.
} else if(key==COAP_OPTION_PROXY_URI) {
// Skip the proxy URI for now.
} else if(key==COAP_OPTION_CONTENT_TYPE) {
// Skip.
} else {
if(COAP_OPTION_IS_CRITICAL(key)) {
ret=SMCP_STATUS_BAD_OPTION;
assert_printf("Unrecognized option %d, \"%s\"",
key,
coap_option_key_to_cstr(key, false)
);
goto bail;
}
}
prev_option_ptr = self->inbound.this_option;
prev_key = self->inbound.last_option_key;
}
}
*func = (void*)node->request_handler;
if(node->context) {
*context = node->context;
} else {
*context = (void*)node;
}
bail:
return ret;
}
