src/map/wmts.cpp

   1 #include <QXmlStreamReader>
   2 #include <QFile>
   3 #include <QFileInfo>
   4 #include <QEventLoop>
   5 #include <QTextStream>
   6 #include <QStringList>
   7 #include <QtAlgorithms>
   8 #include <QXmlStreamReader>
   9 #include "downloader.h"
  10 #include "pcs.h"
  11 #include "crs.h"
  12 #include "wmts.h"
  13
  14
  15 WMTS::TileMatrix WMTS::tileMatrix(QXmlStreamReader &reader)
  16 {
  17         TileMatrix matrix;
  18
  19         while (reader.readNextStartElement()) {
  20                 if (reader.name() == "Identifier")
  21                         matrix.id = reader.readElementText();
  22                 else if (reader.name() == "ScaleDenominator")
  23                         matrix.scaleDenominator = reader.readElementText().toDouble();
  24                 else if (reader.name() == "TopLeftCorner") {
  25                         QString str = reader.readElementText();
  26                         QTextStream ts(&str);
  27                         ts >> matrix.topLeft.rx() >> matrix.topLeft.ry();
  28                 } else if (reader.name() == "TileWidth")
  29                         matrix.tile.setWidth(reader.readElementText().toInt());
  30                 else if (reader.name() == "TileHeight")
  31                         matrix.tile.setHeight(reader.readElementText().toInt());
  32                 else if (reader.name() == "MatrixWidth")
  33                         matrix.matrix.setWidth(reader.readElementText().toInt());
  34                 else if (reader.name() == "MatrixHeight")
  35                         matrix.matrix.setHeight(reader.readElementText().toInt());
  36                 else
  37                         reader.skipCurrentElement();
  38         }
  39
  40         if (!matrix.isValid())
  41                 reader.raiseError("Invalid TileMatrix definition");
  42
  43         return matrix;
  44 }
  45
  46 void WMTS::tileMatrixSet(QXmlStreamReader &reader, CTX &ctx)
  47 {
  48         QString id, crs;
  49         QSet<TileMatrix> matrixes;
  50
  51         while (reader.readNextStartElement()) {
  52                 if (reader.name() == "Identifier")
  53                         id = reader.readElementText();
  54                 else if (reader.name() == "SupportedCRS")
  55                         crs = reader.readElementText();
  56                 else if (reader.name() == "TileMatrix")
  57                         matrixes.insert(tileMatrix(reader));
  58                 else
  59                         reader.skipCurrentElement();
  60         }
  61
  62         if (id == ctx.setup.set()) {
  63                 ctx.crs = crs;
  64                 _matrixes = matrixes;
  65         }
  66 }
  67
  68 WMTS::MatrixLimits WMTS::tileMatrixLimits(QXmlStreamReader &reader)
  69 {
  70         MatrixLimits limits;
  71
  72         while (reader.readNextStartElement()) {
  73                 if (reader.name() == "TileMatrix")
  74                         limits.id = reader.readElementText();
  75                 else if (reader.name() == "MinTileRow")
  76                         limits.rect.setTop(reader.readElementText().toInt());
  77                 else if (reader.name() == "MaxTileRow")
  78                         limits.rect.setBottom(reader.readElementText().toInt());
  79                 else if (reader.name() == "MinTileCol")
  80                         limits.rect.setLeft(reader.readElementText().toInt());
  81                 else if (reader.name() == "MaxTileCol")
  82                         limits.rect.setRight(reader.readElementText().toInt());
  83                 else
  84                         reader.skipCurrentElement();
  85         }
  86
  87         if (!limits.isValid())
  88                 reader.raiseError("Invalid TileMatrixLimits definition");
  89
  90         return limits;
  91 }
  92
  93 QSet<WMTS::MatrixLimits> WMTS::tileMatrixSetLimits(QXmlStreamReader &reader)
  94 {
  95         QSet<MatrixLimits> limits;
  96
  97         while (reader.readNextStartElement()) {
  98                 if (reader.name() == "TileMatrixLimits")
  99                         limits.insert(tileMatrixLimits(reader));
 100                 else
 101                         reader.skipCurrentElement();
 102         }
 103
 104         return limits;
 105 }
 106
 107 void WMTS::tileMatrixSetLink(QXmlStreamReader &reader, CTX &ctx)
 108 {
 109         QString id;
 110         QSet<MatrixLimits> limits;
 111
 112         while (reader.readNextStartElement()) {
 113                 if (reader.name() == "TileMatrixSet")
 114                         id = reader.readElementText();
 115                 else if (reader.name() == "TileMatrixSetLimits")
 116                         limits = tileMatrixSetLimits(reader);
 117                 else
 118                         reader.skipCurrentElement();
 119         }
 120
 121         if (id == ctx.setup.set()) {
 122                 ctx.hasSet = true;
 123                 _limits = limits;
 124         }
 125 }
 126
 127 RectC WMTS::wgs84BoundingBox(QXmlStreamReader &reader)
 128 {
 129         Coordinates topLeft, bottomRight;
 130
 131         while (reader.readNextStartElement()) {
 132                 if (reader.name() == "LowerCorner") {
 133                         QString str = reader.readElementText();
 134                         QTextStream(&str) >> topLeft.rlon() >> bottomRight.rlat();
 135                 } else if (reader.name() == "UpperCorner") {
 136                         QString str = reader.readElementText();
 137                         QTextStream(&str) >> bottomRight.rlon() >> topLeft.rlat();
 138                 } else
 139                         reader.skipCurrentElement();
 140         }
 141
 142         return RectC(topLeft, bottomRight);
 143 }
 144
 145 QString WMTS::style(QXmlStreamReader &reader)
 146 {
 147         QString id;
 148
 149         while (reader.readNextStartElement()) {
 150                 if (reader.name() == "Identifier")
 151                         id = reader.readElementText();
 152                 else
 153                         reader.skipCurrentElement();
 154         }
 155
 156         return id;
 157 }
 158
 159 void WMTS::layer(QXmlStreamReader &reader, CTX &ctx)
 160 {
 161         QString id, tpl;
 162         RectC bounds;
 163         QStringList formats, styles;
 164
 165         while (reader.readNextStartElement()) {
 166                 if (reader.name() == "Identifier")
 167                         id = reader.readElementText();
 168                 else if (reader.name() == "TileMatrixSetLink")
 169                         tileMatrixSetLink(reader, ctx);
 170                 else if (reader.name() == "WGS84BoundingBox")
 171                         bounds = wgs84BoundingBox(reader);
 172                 else if (reader.name() == "ResourceURL") {
 173                         const QXmlStreamAttributes &attr = reader.attributes();
 174                         if (attr.value("resourceType") == "tile")
 175                                 tpl = attr.value("template").toString();
 176                         reader.skipCurrentElement();
 177                 } else if (reader.name() == "Style")
 178                         styles.append(style(reader));
 179                 else if (reader.name() == "Format")
 180                         formats.append(reader.readElementText());
 181                 else
 182                         reader.skipCurrentElement();
 183         }
 184
 185         if (id == ctx.setup.layer()) {
 186                 ctx.hasLayer = true;
 187                 _bounds = bounds;
 188                 if (ctx.setup.rest())
 189                         _tileUrl = tpl;
 190                 if (styles.contains(ctx.setup.style()) || ctx.setup.style().isEmpty())
 191                         ctx.hasStyle = true;
 192                 if (formats.contains(ctx.setup.format()))
 193                         ctx.hasFormat = true;
 194         }
 195 }
 196
 197 void WMTS::contents(QXmlStreamReader &reader, CTX &ctx)
 198 {
 199         while (reader.readNextStartElement()) {
 200                 if (reader.name() == "TileMatrixSet")
 201                         tileMatrixSet(reader, ctx);
 202                 else if (reader.name() == "Layer")
 203                         layer(reader, ctx);
 204                 else
 205                         reader.skipCurrentElement();
 206         }
 207 }
 208
 209 void WMTS::capabilities(QXmlStreamReader &reader, CTX &ctx)
 210 {
 211         while (reader.readNextStartElement()) {
 212                 if (reader.name() == "Contents")
 213                         contents(reader, ctx);
 214                 else
 215                         reader.skipCurrentElement();
 216         }
 217 }
 218
 219 bool WMTS::parseCapabilities(const QString &path, const Setup &setup)
 220 {
 221         QFile file(path);
 222         CTX ctx(setup);
 223         QXmlStreamReader reader;
 224
 225         if (!file.open(QFile::ReadOnly | QFile::Text)) {
 226                 _errorString = file.errorString();
 227                 return false;
 228         }
 229
 230         reader.setDevice(&file);
 231         if (reader.readNextStartElement()) {
 232                 if (reader.name() == "Capabilities")
 233                         capabilities(reader, ctx);
 234                 else
 235                         reader.raiseError("Not a Capabilities XML file");
 236         }
 237         if (reader.error()) {
 238                 _errorString = QString("%1:%2: %3").arg(path).arg(reader.lineNumber())
 239                   .arg(reader.errorString());
 240                 return false;
 241         }
 242
 243         if (!ctx.hasLayer) {
 244                 _errorString = ctx.setup.layer() + ": layer not provided";
 245                 return false;
 246         }
 247         if (!ctx.hasStyle) {
 248                 _errorString = ctx.setup.style() + ": style not provided";
 249                 return false;
 250         }
 251         if (!ctx.setup.rest() && !ctx.hasFormat) {
 252                 _errorString = ctx.setup.format() + ": format not provided";
 253                 return false;
 254         }
 255         if (!ctx.hasSet) {
 256                 _errorString = ctx.setup.set() + ": set not provided";
 257                 return false;
 258         }
 259         if (ctx.crs.isNull()) {
 260                 _errorString = "Missing CRS definition";
 261                 return false;
 262         }
 263         _projection = CRS::projection(ctx.crs);
 264         if (!_projection.isValid()) {
 265                 _errorString = ctx.crs + ": unknown CRS";
 266                 return false;
 267         }
 268         if (_matrixes.isEmpty()) {
 269                 _errorString = "No usable tile matrix found";
 270                 return false;
 271         }
 272         if (ctx.setup.rest() && _tileUrl.isNull()) {
 273                 _errorString = "Missing tile URL template";
 274                 return false;
 275         }
 276
 277         return true;
 278 }
 279
 280 bool WMTS::getCapabilities(const QString &url, const QString &file,
 281   const Authorization &authorization)
 282 {
 283         Downloader d;
 284         QList<Download> dl;
 285
 286         dl.append(Download(url, file));
 287
 288         QEventLoop wait;
 289         QObject::connect(&d, SIGNAL(finished()), &wait, SLOT(quit()));
 290         if (d.get(dl, authorization))
 291                 wait.exec();
 292
 293         if (QFileInfo(file).exists())
 294                 return true;
 295         else {
 296                 _errorString = "Error downloading capabilities XML file";
 297                 return false;
 298         }
 299 }
 300
 301 WMTS::WMTS(const QString &file, const WMTS::Setup &setup) : _valid(false)
 302 {
 303         QString capaUrl = setup.rest() ? setup.url() :
 304           QString("%1%2service=WMTS&Version=1.0.0&request=GetCapabilities")
 305           .arg(setup.url(), setup.url().contains('?') ? "&" : "?");
 306
 307         if (!QFileInfo(file).exists())
 308                 if (!getCapabilities(capaUrl, file, setup.authorization()))
 309                         return;
 310         if (!parseCapabilities(file, setup))
 311                 return;
 312
 313         QString style = setup.style().isEmpty() ? "default" : setup.style();
 314         if (!setup.rest()) {
 315                 _tileUrl = QString("%1%2service=WMTS&Version=1.0.0&request=GetTile"
 316                   "&Format=%3&Layer=%4&Style=%5&TileMatrixSet=%6&TileMatrix=$z"
 317                   "&TileRow=$y&TileCol=$x").arg(setup.url(),
 318                   setup.url().contains('?') ? "&" : "?" , setup.format(),
 319                   setup.layer(), style, setup.set());
 320                 for (int i = 0; i < setup.dimensions().size(); i++) {
 321                         const QPair<QString, QString> &dim = setup.dimensions().at(i);
 322                         _tileUrl.append(QString("&%1=%2").arg(dim.first, dim.second));
 323                 }
 324         } else {
 325                 _tileUrl.replace("{Style}", style, Qt::CaseInsensitive);
 326                 _tileUrl.replace("{TileMatrixSet}", setup.set(), Qt::CaseInsensitive);
 327                 _tileUrl.replace("{TileMatrix}", "$z", Qt::CaseInsensitive);
 328                 _tileUrl.replace("{TileRow}", "$y", Qt::CaseInsensitive);
 329                 _tileUrl.replace("{TileCol}", "$x", Qt::CaseInsensitive);
 330                 for (int i = 0; i < setup.dimensions().size(); i++) {
 331                         const QPair<QString, QString> &dim = setup.dimensions().at(i);
 332                         _tileUrl.replace(QString("{%1}").arg(dim.first), dim.second,
 333                           Qt::CaseInsensitive);
 334                 }
 335         }
 336
 337         _valid = true;
 338 }
 339
 340 QList<WMTS::Zoom> WMTS::zooms() const
 341 {
 342         QList<Zoom> zooms;
 343         QSet<TileMatrix>::const_iterator mi;
 344         QSet<MatrixLimits>::const_iterator li;
 345
 346         for (mi = _matrixes.constBegin(); mi != _matrixes.constEnd(); ++mi) {
 347                 if ((li = _limits.find(MatrixLimits(mi->id))) == _limits.constEnd())
 348                         zooms.append(Zoom(mi->id, mi->scaleDenominator, mi->topLeft,
 349                           mi->tile, mi->matrix, QRect()));
 350                 else
 351                         zooms.append(Zoom(mi->id, mi->scaleDenominator, mi->topLeft,
 352                           mi->tile, mi->matrix, li->rect));
 353         }
 354
 355         qSort(zooms);
 356
 357         return zooms;
 358 }
 359
 360 #ifndef QT_NO_DEBUG
 361 QDebug operator<<(QDebug dbg, const WMTS::Setup &setup)
 362 {
 363         dbg.nospace() << "Setup(" << setup.url() << ", " << setup.layer() << ", "
 364           << setup.set() << ", " << setup.style() << ", " << setup.format() << ", "
 365           << setup.rest() << ")";
 366         return dbg.space();
 367 }
 368
 369 QDebug operator<<(QDebug dbg, const WMTS::Zoom &zoom)
 370 {
 371         dbg.nospace() << "Zoom(" << zoom.id() << ", " << zoom.scaleDenominator()
 372           << ", " << zoom.topLeft() << ", " << zoom.tile() << ", " << zoom.matrix()
 373           << ", " << zoom.limits() << ")";
 374         return dbg.space();
 375 }
 376 #endif // QT_NO_DEBUG