ifttt.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "mbed.h"
00018 #include "ifttt.h"
00019 #include <string>
00020 
00021 #if 0
00022 #define DBG(x, ...)  printf("[IFTTT : DBG]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__);
00023 #define WARN(x, ...) printf("[IFTTT : WARN]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__);
00024 #define ERR(x, ...)  printf("[IFTTT : ERR]"x" \t[%s,%d]\r\n", ##__VA_ARGS__,__FILE__,__LINE__);
00025 #else
00026 #define DBG(x, ...) //wait_us(10);
00027 #define WARN(x, ...) //wait_us(10);
00028 #define ERR(x, ...)
00029 #endif
00030 
00031 #if 1
00032 #define INFO(x, ...) printf("[IFTTT : INFO]"x" \r\n",##__VA_ARGS__);
00033 #else
00034 #define INFO(x, ...)
00035 #endif
00036 
00037 //
00038 // Initialize object with Event, Key, and valid socket.
00039 // TODO: accept hostname parameter / implement DNS lookup
00040 //
00041 IFTTT::IFTTT(const char * event, const char * key, TCPSocketConnection * s)
00042 {
00043     // Error Check
00044     if(sizeof(event) > IFTTT_MAX_SIZE_EVENTNAME) {
00045         ERR("Given event > IFTTT_MAX_SIZE_EVENTNAME, increase the max event string size in ifttt.h");
00046     }
00047     if(sizeof(key) > IFTTT_MAX_SIZE_SECRETKEY) {
00048         ERR("Given key > IFTTT_MAX_SIZE_SECRETKEY, increase the max secret key string size in ifttt.h");
00049     }
00050     // Copy event name and secret key into object instance
00051     strcpy(this->eventName,event);
00052     strcpy(this->secretKey,key);
00053 
00054     // Set up Socket
00055     if(NULL == s) {
00056         WARN("Given Socket Pointer is NULL, will try opening a socket.");
00057     }
00058     this->socket = s;
00059 
00060     // Set up Host / Port
00061     this->port = IFTTT_PORT;
00062     this->host = IFTTT_IP;
00063     
00064     // Initialize ingredient values to empty strings.
00065     v1 = "";
00066     v2 = "";
00067     v3 = "";
00068 }
00069 
00070 //
00071 // Add ingredients to be sent.
00072 //
00073 bool
00074 IFTTT::addIngredients( char * value1,  char * value2,  char * value3)
00075 {
00076     // update internal pointers. If variable not given then pass an empty string
00077     v1 = (NULL == value1)?"":value1;
00078     v2 = (NULL == value2)?"":value2;
00079     v3 = (NULL == value3)?"":value3;
00080     return true;
00081 }
00082 
00083 //
00084 // This function sends data to maker.ifttt.org via GET query commands
00085 // return true on sucess, false on fail
00086 //
00087 bool IFTTT::get()
00088 {
00089     // Connect to maker.ifttt.org
00090     int retry = 0;
00091     for(retry=0; retry<IFTTT_MAX_RETRY; retry++) {
00092         int ret = this->socket->connect(this->host, this->port);
00093         if(ret == 0) {
00094             DBG("Successfully Connected socket to host");
00095             break ;
00096         }
00097     }
00098     if(retry == IFTTT_MAX_RETRY) {
00099         this->socket->close();
00100         ERR("Could not connect socket to host\r\n");
00101         return false;
00102     }
00103 
00104     // Prep data to send
00105     // TODO: verify / modify data to be query string compliant (convert spaces to '+', convert non-alpha-numberic characters to the proper encoding... etc)
00106     char str[IFTTT_MAX_SIZE_STRING] = {0};
00107     sprintf(str, "GET /trigger/%s/with/key/%s/?value1=%s&value2=%s&value3=%s HTTP/1.1\r\nHost: maker.ifttt.com\r\n\r\n",eventName,secretKey,v1,v2,v3);
00108     DBG("String to send is:\n\r%s",str);
00109 
00110     // Send Data
00111     DBG("Sending GET data...");
00112     int check = 0;
00113     check = this->socket->send_all(str,sizeof(str));
00114     if(check) {
00115         DBG("Sent Sucessfully %d bytes",check);
00116     } else {
00117         ERR("Sending failed");
00118         return false;
00119     }
00120     DBG("Waiting on reply ... \r\n");
00121     int ret = this->socket->receive(str,50);
00122     str[ret]=0;
00123     DBG("Received String : %s",str);
00124     this->socket->close();
00125 
00126     return true;
00127 }
00128 
00129 //
00130 // This function sends JSON encoded data encoded in a POST packet, 
00131 //
00132 bool IFTTT::post()
00133 {
00134     // Connect to maker.ifttt.org
00135     int retry = 0;
00136     for(retry=0; retry<IFTTT_MAX_RETRY; retry++) {
00137         int ret = this->socket->connect(this->host, this->port);
00138         if(ret == 0) {
00139             DBG("Successfully Connected socket to host");
00140             break ;
00141         }
00142     }
00143     if(retry == IFTTT_MAX_RETRY) {
00144         this->socket->close();
00145         ERR("Could not connect socket to host\r\n");
00146         return false;
00147     }
00148 
00149     // Prep data to send, the Assembled POST packet should look like this
00150     //
00151     //
00152     //POST /trigger/<eventName>/with/key/<secretKey> HTTP/1.1
00153     //Host: maker.ifttt.com
00154     //Content-Length: <length of POST data>
00155     //Content-Type: application/json
00156     //
00157     //{"value1":"<v1>","value2":"<v2>","value3":"<v3>"}
00158     //
00159     //
00160     char str[IFTTT_MAX_SIZE_STRING] = {0};
00161     char header[100] = {0};
00162     sprintf(header, "POST /trigger/%s/with/key/%s HTTP/1.1\r\n",eventName,secretKey);
00163     const char * host = "Host: maker.ifttt.com\r\n";
00164     char contentLen[50] = {0};
00165     const char * contentType = "Content-Type: application/json\r\n\r\n";
00166     char valueData [150] = {0};
00167     sprintf(valueData,"{\"value1\":\"%s\",\"value2\":\"%s\",\"value3\":\"%s\"}\r\n",v1,v2,v3);
00168     sprintf(contentLen,"Content-Length: %d\r\n",strlen(valueData));
00169     sprintf(str,"%s%s%s%s%s",header,host,contentLen,contentType,valueData);
00170 
00171     DBG("String to send is:\n\r%s",str);
00172 
00173     // Send Data
00174     DBG("Sending POST data...");
00175     int check = 0;
00176     check = this->socket->send_all(str,strlen(str));
00177     if(check) {
00178         DBG("Sent Sucessfully %d bytes",check);
00179     } else {
00180         ERR("Sending failed");
00181         return false;
00182     }
00183     DBG("Waiting on reply ... \r\n");
00184     int ret = this->socket->receive(str,IFTTT_MAX_SIZE_STRING);
00185     str[ret]=0;
00186     DBG("Received String : %s",str);
00187     this->socket->close();
00188 
00189     return true;
00190 }
00191 
00192 //
00193 // Send trigger and any values associated to maker.ifttt.com
00194 // currently  unsecured (sends over HTTP, not https)
00195 //
00196 bool
00197 IFTTT::trigger(int triggerType)
00198 {
00199     int ret = 0;
00200     switch(triggerType) {
00201         case IFTTT_GET:
00202             DBG("Sending Data as GET request");
00203             ret = get();
00204             break;
00205         case IFTTT_POST:
00206             DBG("Sending Data as POST request");
00207             ret = post();
00208             break;
00209 
00210         default:
00211             WARN("Invalid type, defaulting to sending data as POST request");
00212             ret = post();
00213             break;
00214     }
00215     DBG("Sending Data return code : %d",ret);
00216     if(ret){
00217     INFO("Successfully triggered event: '%s' with v1='%s', v2='%s', v3='%s' !",eventName,v1,v2,v3);
00218     }
00219     return ret;
00220 }