178 lines
9.7 KiB
C
178 lines
9.7 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* Example resource
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include <string.h>
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#include "rest-engine.h"
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#include "er-coap.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#define PRINTLLADDR(lladdr) PRINTF("[%02x:%02x:%02x:%02x:%02x:%02x]", (lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3], (lladdr)->addr[4], (lladdr)->addr[5])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(addr)
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#endif
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static void res_any_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
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/* This resource mirrors the incoming request. It shows how to access the options and how to set them for the response. */
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RESOURCE(res_mirror,
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"title=\"Returns your decoded message\";rt=\"Debug\"",
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res_any_handler,
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res_any_handler,
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res_any_handler,
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res_any_handler);
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static void
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res_any_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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/* The ETag and Token is copied to the header. */
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uint8_t opaque[] = { 0x0A, 0xBC, 0xDE };
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/* Strings are not copied, so use static string buffers or strings in .text memory (char *str = "string in .text";). */
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static char location[] = { '/', 'f', '/', 'a', '?', 'k', '&', 'e', 0 };
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/* No default my be assumed for the Content-Format. (Unsigned -1 means all bits set.) */
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unsigned int content_format = -1;
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/* The other getters copy the value (or string/array pointer) to the given pointers and return 1 for success or the length of strings/arrays. */
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uint32_t longint = 0;
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const char *str = NULL;
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const uint8_t *bytes = NULL;
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uint32_t block_num = 0;
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uint8_t block_more = 0;
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uint16_t block_size = 0;
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int len = 0;
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/* Mirror the received header options in the response payload. Unsupported getters (e.g., rest_get_header_observe() with HTTP) will return 0. */
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int strpos = 0;
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/* snprintf() counts the terminating '\0' to the size parameter.
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* The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework.
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* Add +1 to fill the complete buffer, as the payload does not need a terminating '\0'. */
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if(REST.get_header_content_type(request, &content_format)) {
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strpos += snprintf((char *)buffer, REST_MAX_CHUNK_SIZE + 1, "CF %u\n", content_format);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = REST.get_header_accept(request, &content_format))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "Ac %u\n", content_format);
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/* Some getters such as for ETag or Location are omitted, as these options should not appear in a request.
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* Max-Age might appear in HTTP requests or used for special purposes in CoAP. */
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && REST.get_header_max_age(request, &longint)) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "MA %lu\n", longint);
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/* For HTTP this is the Length option, for CoAP it is the Size option. */
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && REST.get_header_length(request, &longint)) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "SZ %lu\n", longint);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = REST.get_header_host(request, &str))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "UH %.*s\n", len, str);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = REST.get_url(request, &str))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "UP %.*s\n", len, str);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = REST.get_query(request, &str))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "UQ %.*s\n", len, str);
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/* Undefined request options for debugging: actions not required for normal RESTful Web service. */
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_path(request, &str))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "LP %.*s\n", len, str);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_query(request, &str))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "LQ %.*s\n", len, str);
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/* CoAP-specific example: actions not required for normal RESTful Web service. */
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}
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coap_packet_t *const coap_pkt = (coap_packet_t *)request;
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if(strpos <= REST_MAX_CHUNK_SIZE && coap_pkt->token_len > 0) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "To 0x");
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int index = 0;
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for(index = 0; index < coap_pkt->token_len; ++index) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "%02X", coap_pkt->token[index]);
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}
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "\n");
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && IS_OPTION(coap_pkt, COAP_OPTION_OBSERVE)) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "Ob %lu\n", coap_pkt->observe);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && IS_OPTION(coap_pkt, COAP_OPTION_ETAG)) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "ET 0x");
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int index = 0;
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for(index = 0; index < coap_pkt->etag_len; ++index) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "%02X", coap_pkt->etag[index]);
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}
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "\n");
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && coap_get_header_block2(request, &block_num, &block_more, &block_size, NULL)) { /* This getter allows NULL pointers to get only a subset of the block parameters. */
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "B2 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL)) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "B1 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
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}
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if(strpos <= REST_MAX_CHUNK_SIZE && (len = REST.get_request_payload(request, &bytes))) {
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strpos += snprintf((char *)buffer + strpos, REST_MAX_CHUNK_SIZE - strpos + 1, "%.*s", len, bytes);
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}
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if(strpos >= REST_MAX_CHUNK_SIZE) {
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buffer[REST_MAX_CHUNK_SIZE - 1] = 0xBB; /* '»' to indicate truncation */
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}
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REST.set_response_payload(response, buffer, strpos);
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PRINTF("/mirror options received: %s\n", buffer);
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/* Set dummy header options for response. Like getters, some setters are not implemented for HTTP and have no effect. */
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REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
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REST.set_header_max_age(response, 17); /* For HTTP, browsers will not re-request the page for 17 seconds. */
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REST.set_header_etag(response, opaque, 2);
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REST.set_header_location(response, location); /* Initial slash is omitted by framework */
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REST.set_header_length(response, strpos); /* For HTTP, browsers will not re-request the page for 10 seconds. CoAP action depends on the client. */
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/* CoAP-specific example: actions not required for normal RESTful Web service. */
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coap_set_header_uri_host(response, "tiki");
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coap_set_header_observe(response, 10);
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coap_set_header_proxy_uri(response, "ftp://x");
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coap_set_header_block2(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */
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coap_set_header_block1(response, 23, 0, 16);
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coap_set_header_accept(response, TEXT_PLAIN);
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coap_set_header_if_none_match(response);
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}
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