static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset) { coap_packet_t *const coap_req = (coap_packet_t *)request; if(validate_change) { validate_update_etag(); } PRINTF("/validate GET"); PRINTF("(%s %u)\n", coap_req->type == COAP_TYPE_CON ? "CON" : "NON", coap_req->mid); if((len = coap_get_header_etag(request, &bytes)) > 0 && len == validate_etag_len && memcmp(validate_etag, bytes, len) == 0) { PRINTF("validate "); REST.set_response_status(response, REST.status.NOT_MODIFIED); REST.set_header_etag(response, validate_etag, validate_etag_len); validate_change = 1; PRINTF("### SERVER ACTION ### Resouce will change\n"); } else { /* Code 2.05 CONTENT is default. */ REST.set_header_content_type(response, REST.type.TEXT_PLAIN); REST.set_header_etag(response, validate_etag, validate_etag_len); REST.set_header_max_age(response, 30); REST.set_response_payload( response, buffer, snprintf((char *)buffer, MAX_PLUGFEST_PAYLOAD, "Type: %u\nCode: %u\nMID: %u", coap_req->type, coap_req->code, coap_req->mid)); } }
void mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset) { /* The ETag and Token is copied to the header. */ uint8_t opaque[] = {0x0A, 0xBC, 0xDE}; /* Strings are not copied, so use static string buffers or strings in .text memory (char *str = "string in .text";). */ static char location[] = {'/','f','/','a','?','k','&','e', 0}; /* Getter for the header option Content-Type. If the option is not set, text/plain is returned by default. */ unsigned int content_type = REST.get_header_content_type(request); /* 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. */ uint32_t max_age_and_size = 0; const char *str = NULL; uint32_t observe = 0; const uint8_t *bytes = NULL; uint32_t block_num = 0; uint8_t block_more = 0; uint16_t block_size = 0; const char *query = ""; int len = 0; /* Mirror the received header options in the response payload. Unsupported getters (e.g., rest_get_header_observe() with HTTP) will return 0. */ int strpos = 0; /* snprintf() counts the terminating '\0' to the size parameter. * The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework. * Add +1 to fill the complete buffer, as the payload does not need a terminating '\0'. */ if (content_type!=-1) { strpos += snprintf((char *)buffer, REST_MAX_CHUNK_SIZE+1, "CT %u\n", content_type); } /* Some getters such as for ETag or Location are omitted, as these options should not appear in a request. * Max-Age might appear in HTTP requests or used for special purposes in CoAP. */ if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_max_age(request, &max_age_and_size)) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "MA %lu\n", max_age_and_size); } /* For HTTP this is the Length option, for CoAP it is the Size option. */ if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_length(request, &max_age_and_size)) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "SZ %lu\n", max_age_and_size); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_header_host(request, &str))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UH %.*s\n", len, str); } /* CoAP-specific example: actions not required for normal RESTful Web service. */ #if WITH_COAP > 1 if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_observe(request, &observe)) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Ob %lu\n", observe); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_token(request, &bytes))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "To 0x"); int index = 0; for (index = 0; index<len; ++index) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]); } strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n"); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_etag(request, &bytes))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "ET 0x"); int index = 0; for (index = 0; index<len; ++index) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]); } strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n"); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_uri_path(request, &str))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UP "); strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s\n", len, str); } #if WITH_COAP == 3 if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location(request, &str))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Lo %.*s\n", len, str); } if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */ { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Bl %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size); } #else if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_path(request, &str))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LP %.*s\n", len, str); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_query(request, &str))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LQ %.*s\n", len, str); } 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. */ { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B2 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size); } /* * Critical Block1 option is currently rejected by engine. * if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL)) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B1 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size); } */ #endif /* CoAP > 03 */ #endif /* CoAP-specific example */ if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_query(request, &query))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Qu %.*s\n", len, query); } if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_request_payload(request, &bytes))) { strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s", len, bytes); } if (strpos >= REST_MAX_CHUNK_SIZE) { buffer[REST_MAX_CHUNK_SIZE-1] = 0xBB; /* '»' to indicate truncation */ } REST.set_response_payload(response, buffer, strpos); PRINTF("/mirror options received: %s\n", buffer); /* Set dummy header options for response. Like getters, some setters are not implemented for HTTP and have no effect. */ REST.set_header_content_type(response, REST.type.TEXT_PLAIN); REST.set_header_max_age(response, 17); /* For HTTP, browsers will not re-request the page for 17 seconds. */ REST.set_header_etag(response, opaque, 2); REST.set_header_location(response, location); /* Initial slash is omitted by framework */ REST.set_header_length(response, strpos); /* For HTTP, browsers will not re-request the page for 10 seconds. CoAP action depends on the client. */ /* CoAP-specific example: actions not required for normal RESTful Web service. */ #if WITH_COAP > 1 coap_set_header_uri_host(response, "tiki"); coap_set_header_observe(response, 10); #if WITH_COAP == 3 coap_set_header_block(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */ #else coap_set_header_proxy_uri(response, "ftp://x"); coap_set_header_block2(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */ coap_set_header_block1(response, 23, 0, 16); coap_set_header_accept(response, TEXT_PLAIN); coap_set_header_if_none_match(response); #endif /* CoAP > 03 */ #endif /* CoAP-specific example */ }