source/objects/CalDAV/CalDAV.cpp

   1 // CalDAV.cpp - CalDAV Connection Object.
   2 //
   3 // (c) 2016 Xestia Software Development.
   4 //
   5 // This file is part of Xestia Calendar.
   6 //
   7 // Xestia Address Book is free software: you can redistribute it and/or modify
   8 // it under the terms of the GNU General Public License as published by the
   9 // Free Software Foundation, version 3 of the license.
  10 //
  11 // Xestia Address Book is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 // GNU General Public License for more details.
  15 //
  16 // You should have received a copy of the GNU General Public License along
  17 // with Xestia Calendar. If not, see <http://www.gnu.org/licenses/>
  18
  19 #include "CalDAV.h"
  20
  21 using namespace std;
  22
  23 size_t CalDAVReceive(char *ReceivedBuffer, size_t Size, size_t NewMemoryBytes, string *StringPointer)
  24 {
  25
  26         string ReceivedBufferString = "";
  27         ReceivedBufferString.append(ReceivedBuffer, NewMemoryBytes);
  28
  29         StringPointer->append(ReceivedBufferString);
  30
  31         return Size * NewMemoryBytes;
  32
  33 }
  34
  35 size_t CalDAVSend(char *SendBuffer, size_t Size, size_t NewMemoryBytes, void *DataStruct){
  36
  37         struct CalDAVSendData *UploadPtr = (struct CalDAVSendData *)DataStruct;
  38
  39         if (UploadPtr->sizeleft){
  40
  41                 UploadPtr->sizeleft--;
  42                 char CharSend;
  43
  44                 CharSend = (*UploadPtr->readptr)[UploadPtr->seek];
  45
  46                 *SendBuffer = CharSend;
  47
  48                 UploadPtr->seek++;
  49
  50                 return 1;
  51
  52         }
  53
  54         return 0;
  55
  56 }
  57
  58 CalDAV::CalDAV(){
  59
  60         // Setup the objects within the CalDAV connection
  61         // object.
  62
  63         ConnectionHandle = curl_easy_init();
  64
  65 }
  66
  67 CalDAV::~CalDAV(){
  68
  69         // Destory the objects within the CalDAV connection
  70         // object.
  71
  72         curl_easy_cleanup(ConnectionHandle);
  73         ConnectionHandle = nullptr;
  74
  75 }
  76
  77 void CalDAV::SetupConnectionData(CalDAVConnectionData *ConnData){
  78
  79         // Check if ConnData is a nullptr, return if it is.
  80
  81         if (ConnData == nullptr){
  82                 return;
  83         }
  84
  85         // Set the connection settings to the values from ConnData.
  86
  87         ConnectionData = (*ConnData);
  88
  89 }
  90
  91 CalDAVStatus CalDAV::GetConnectionData(){
  92
  93         // Get the current connection settings for the CalDAV
  94         // connection object and return a CalDAVStatus object.
  95
  96         CalDAVStatus ConnectionStatus;
  97
  98         ConnectionStatus.Hostname = ConnectionData.Hostname;
  99         ConnectionStatus.Port = ConnectionData.Port;
 100         ConnectionStatus.Username = ConnectionData.Username;
 101         ConnectionStatus.Prefix = ConnectionData.Prefix;
 102         ConnectionStatus.UseSSL = ConnectionData.UseSSL;
 103         ConnectionStatus.Timeout = ConnectionData.Timeout;
 104
 105         return ConnectionStatus;
 106
 107 }
 108
 109 CalDAVServerResult CalDAV::Connect(){
 110
 111         CalDAVServerResult ServerResult;
 112
 113         string ServerAddress = "";
 114         string ServerUserPass = "";
 115
 116         // Setup the server address.
 117
 118         ServerAddress = BuildServerAddress(&ConnectionData, "/principals/");
 119
 120         // Setup the server password.
 121
 122         ServerUserPass += ConnectionData.Username;
 123         ServerUserPass += ":";
 124         ServerUserPass += ConnectionData.Password;
 125
 126         curl_easy_setopt(ConnectionHandle, CURLOPT_URL, ServerAddress.c_str());
 127         curl_easy_setopt(ConnectionHandle, CURLOPT_USERPWD, ServerUserPass.c_str());
 128         curl_easy_setopt(ConnectionHandle, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
 129         curl_easy_setopt(ConnectionHandle, CURLOPT_FAILONERROR, 1L);
 130         curl_easy_setopt(ConnectionHandle, CURLOPT_TIMEOUT, ConnectionData.Timeout);
 131         curl_easy_setopt(ConnectionHandle, CURLOPT_WRITEFUNCTION, CalDAVOutput);
 132         curl_easy_setopt(ConnectionHandle, CURLOPT_WRITEDATA, &ServerData);
 133         curl_easy_setopt(ConnectionHandle, CURLOPT_WRITEHEADER, &ServerHeader);
 134
 135         // Connect to the CalDAV server.
 136
 137         ServerResult.Code = curl_easy_perform(ConnectionHandle);
 138
 139         // Process the result received from the server.
 140
 141         if (ServerResult.Code != CURLE_OK){
 142
 143                 ServerResult.Result = CALDAVQUERYRESULT_SERVERERROR;
 144
 145         } else {
 146
 147                 ServerResult.Result = CALDAVQUERYRESULT_OK;
 148
 149         }
 150
 151         // Get the HTTP code.
 152
 153         curl_easy_getinfo(ConnectionHandle, CURLINFO_RESPONSE_CODE, &ServerResult.HTTPCode);
 154
 155         return ServerResult;
 156
 157 }
 158
 159 CalDAVServerSupport CalDAV::GetServerSupport(){
 160
 161         CalDAVServerSupport ServerStatus;
 162
 163         // Setup the server connection.
 164
 165         curl_easy_setopt(ConnectionHandle, CURLOPT_CUSTOMREQUEST, "OPTIONS");
 166
 167         CURLcode ServerResult = curl_easy_perform(ConnectionHandle);
 168
 169         if (ServerResult != CURLE_OK){
 170                 return ServerStatus;
 171         }
 172
 173         // Check that the server header has data in,
 174         // otherwise return an "empty" CalDAVServerSupport.
 175
 176         if (ServerHeader.size() == 0){
 177                 return ServerStatus;
 178         }
 179
 180         // Process each line looking for the first DAV header
 181         // line.
 182
 183         bool NewlineMode = true;
 184
 185         string DAVLine;
 186
 187         for (int CharSeek = 0; CharSeek < ServerHeader.size(); CharSeek++){
 188
 189                 if (NewlineMode == true){
 190
 191                         // Check if we have reached the end of the string.
 192
 193                         if (CharSeek >= ServerHeader.size()){
 194
 195                                 break;
 196
 197                         }
 198
 199                         // Check the first four letters to make sure
 200                         // they are 'DAV:'.
 201
 202                         string DAVHeaderCheck = "";
 203
 204                         try {
 205                                 DAVHeaderCheck = ServerHeader.substr(CharSeek, 4);
 206                         }
 207
 208                         catch (out_of_range &oor){
 209                                 break;
 210                         }
 211
 212                         if (DAVHeaderCheck == "DAV:"){
 213
 214                                 CharSeek += 5;
 215
 216                                 for (; CharSeek < ServerHeader.size(); CharSeek++){
 217
 218                                         if (ServerHeader[CharSeek] == '\n'){
 219
 220                                                 break;
 221
 222                                         }
 223
 224                                         DAVLine.push_back(ServerHeader[CharSeek]);
 225
 226                                 }
 227
 228                                 break;
 229
 230                         }
 231
 232                         NewlineMode = false;
 233
 234                 }
 235
 236                 if (ServerHeader[CharSeek] == '\n'){
 237
 238                         NewlineMode = true;
 239
 240                 }
 241
 242         }
 243
 244         // Process the DAV line.
 245
 246         vector<string> DAVLineData;
 247         string DAVSegmentString;
 248
 249         for (int CharSeek = 0; CharSeek < DAVLine.size(); CharSeek++){
 250
 251                 if (DAVLine[CharSeek] == ' '){
 252                         continue;
 253                 }
 254
 255                 if (DAVLine[CharSeek] == ','){
 256
 257                         DAVLineData.push_back(DAVSegmentString);
 258                         DAVSegmentString.clear();
 259                         continue;
 260
 261                 }
 262
 263                 DAVSegmentString += DAVLine[CharSeek];
 264
 265         }
 266
 267         // Process the DAV values and set each value
 268         // to true as required.
 269
 270         for (int DAVItemSeek = 0;
 271                 DAVItemSeek < DAVLineData.size();
 272                 DAVItemSeek++){
 273
 274                 if (DAVLineData.at(DAVItemSeek) == "calendar-access"){
 275
 276                         ServerStatus.BasicSupport = true;
 277
 278                 }
 279
 280         }
 281
 282         return ServerStatus;
 283
 284 }
 285
 286 bool CalDAVObjectValidSettings(CalDAVConnectionData *ConnData){
 287
 288         // Check if the passed CalDAV Connection Data is has
 289         // an address set. Return false if nullptr is used.
 290
 291         if (ConnData == nullptr){
 292
 293                 return false;
 294
 295         }
 296
 297         // Check the server hostname. Return false
 298         // if no value has been set.
 299
 300         if (ConnData->Hostname.size() == 0){
 301
 302                 return false;
 303
 304         }
 305
 306         // Check the server port. Return false if
 307         // no value has been set or the port number
 308         // is less than 1 or higher than 65535.
 309
 310         if (ConnData->Port < 1 || ConnData->Port > 65535){
 311
 312                 return false;
 313
 314         }
 315
 316         // Check the server username. Return false
 317         // if no value has been set.
 318
 319         if (ConnData->Username.size() == 0){
 320
 321                 return false;
 322
 323         }
 324
 325         // Check the server password. Return false
 326         // if no value has been set.
 327
 328         if (ConnData->Password.size() == 0){
 329
 330                 return false;
 331
 332         }
 333
 334         // Cannot check UseSSL: It is either true
 335         // or false.
 336
 337         // Cannot check Prefix: The prefix may need
 338         // to be worked out first.
 339
 340         // No errors were found whilst checking so
 341         // return true.
 342
 343         return true;
 344
 345 }
 346
 347 string BuildServerAddress(CalDAVConnectionData *ConnData, string URIAddress){
 348
 349         string ServerAddress;
 350
 351         // Setup the server address.
 352
 353         if (ConnData->UseSSL == true){
 354                 ServerAddress += "https://";
 355         } else {
 356                 ServerAddress += "http://";
 357         }
 358
 359         ServerAddress += ConnData->Hostname;
 360
 361         // Check if server port is 80, otherwise
 362         // specifiy the port number in the address.
 363
 364         if (ConnData->Port != 80){
 365                 ServerAddress += ":";
 366                 ServerAddress += to_string(ConnData->Port);
 367         }
 368
 369         ServerAddress += URIAddress;
 370
 371         return ServerAddress;
 372
 373 }