openlayers
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Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.source.WMTS');
goog.require('ol');
goog.require('ol.TileUrlFunction');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.source.TileImage');
goog.require('ol.tilegrid.WMTS');
goog.require('ol.uri');
/**
* @classdesc
* Layer source for tile data from WMTS servers.
*
* @constructor
* @extends {ol.source.TileImage}
* @param {olx.source.WMTSOptions} options WMTS options.
* @api stable
*/
ol.source.WMTS = function(options) {
// TODO: add support for TileMatrixLimits
/**
* @private
* @type {string}
*/
this.version_ = options.version !== undefined ? options.version : '1.0.0';
/**
* @private
* @type {string}
*/
this.format_ = options.format !== undefined ? options.format : 'image/jpeg';
/**
* @private
* @type {!Object}
*/
this.dimensions_ = options.dimensions !== undefined ? options.dimensions : {};
/**
* @private
* @type {string}
*/
this.layer_ = options.layer;
/**
* @private
* @type {string}
*/
this.matrixSet_ = options.matrixSet;
/**
* @private
* @type {string}
*/
this.style_ = options.style;
var urls = options.urls;
if (urls === undefined && options.url !== undefined) {
urls = ol.TileUrlFunction.expandUrl(options.url);
}
// FIXME: should we guess this requestEncoding from options.url(s)
// structure? that would mean KVP only if a template is not provided.
/**
* @private
* @type {ol.source.WMTS.RequestEncoding}
*/
this.requestEncoding_ = options.requestEncoding !== undefined ?
/** @type {ol.source.WMTS.RequestEncoding} */ (options.requestEncoding) :
ol.source.WMTS.RequestEncoding.KVP;
var requestEncoding = this.requestEncoding_;
// FIXME: should we create a default tileGrid?
// we could issue a getCapabilities xhr to retrieve missing configuration
var tileGrid = options.tileGrid;
// context property names are lower case to allow for a case insensitive
// replacement as some services use different naming conventions
var context = {
'layer': this.layer_,
'style': this.style_,
'tilematrixset': this.matrixSet_
};
if (requestEncoding == ol.source.WMTS.RequestEncoding.KVP) {
ol.obj.assign(context, {
'Service': 'WMTS',
'Request': 'GetTile',
'Version': this.version_,
'Format': this.format_
});
}
var dimensions = this.dimensions_;
/**
* @param {string} template Template.
* @return {ol.TileUrlFunctionType} Tile URL function.
*/
function createFromWMTSTemplate(template) {
// TODO: we may want to create our own appendParams function so that params
// order conforms to wmts spec guidance, and so that we can avoid to escape
// special template params
template = (requestEncoding == ol.source.WMTS.RequestEncoding.KVP) ?
ol.uri.appendParams(template, context) :
template.replace(/\{(\w+?)\}/g, function(m, p) {
return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;
});
return (
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {number} pixelRatio Pixel ratio.
* @param {ol.proj.Projection} projection Projection.
* @return {string|undefined} Tile URL.
*/
function(tileCoord, pixelRatio, projection) {
if (!tileCoord) {
return undefined;
} else {
var localContext = {
'TileMatrix': tileGrid.getMatrixId(tileCoord[0]),
'TileCol': tileCoord[1],
'TileRow': -tileCoord[2] - 1
};
ol.obj.assign(localContext, dimensions);
var url = template;
if (requestEncoding == ol.source.WMTS.RequestEncoding.KVP) {
url = ol.uri.appendParams(url, localContext);
} else {
url = url.replace(/\{(\w+?)\}/g, function(m, p) {
return localContext[p];
});
}
return url;
}
});
}
var tileUrlFunction = (urls && urls.length > 0) ?
ol.TileUrlFunction.createFromTileUrlFunctions(
urls.map(createFromWMTSTemplate)) :
ol.TileUrlFunction.nullTileUrlFunction;
ol.source.TileImage.call(this, {
attributions: options.attributions,
cacheSize: options.cacheSize,
crossOrigin: options.crossOrigin,
logo: options.logo,
projection: options.projection,
reprojectionErrorThreshold: options.reprojectionErrorThreshold,
tileClass: options.tileClass,
tileGrid: tileGrid,
tileLoadFunction: options.tileLoadFunction,
tilePixelRatio: options.tilePixelRatio,
tileUrlFunction: tileUrlFunction,
urls: urls,
wrapX: options.wrapX !== undefined ? options.wrapX : false
});
this.setKey(this.getKeyForDimensions_());
};
ol.inherits(ol.source.WMTS, ol.source.TileImage);
/**
* Get the dimensions, i.e. those passed to the constructor through the
* "dimensions" option, and possibly updated using the updateDimensions
* method.
* @return {!Object} Dimensions.
* @api
*/
ol.source.WMTS.prototype.getDimensions = function() {
return this.dimensions_;
};
/**
* Return the image format of the WMTS source.
* @return {string} Format.
* @api
*/
ol.source.WMTS.prototype.getFormat = function() {
return this.format_;
};
/**
* Return the layer of the WMTS source.
* @return {string} Layer.
* @api
*/
ol.source.WMTS.prototype.getLayer = function() {
return this.layer_;
};
/**
* Return the matrix set of the WMTS source.
* @return {string} MatrixSet.
* @api
*/
ol.source.WMTS.prototype.getMatrixSet = function() {
return this.matrixSet_;
};
/**
* Return the request encoding, either "KVP" or "REST".
* @return {ol.source.WMTS.RequestEncoding} Request encoding.
* @api
*/
ol.source.WMTS.prototype.getRequestEncoding = function() {
return this.requestEncoding_;
};
/**
* Return the style of the WMTS source.
* @return {string} Style.
* @api
*/
ol.source.WMTS.prototype.getStyle = function() {
return this.style_;
};
/**
* Return the version of the WMTS source.
* @return {string} Version.
* @api
*/
ol.source.WMTS.prototype.getVersion = function() {
return this.version_;
};
/**
* @private
* @return {string} The key for the current dimensions.
*/
ol.source.WMTS.prototype.getKeyForDimensions_ = function() {
var i = 0;
var res = [];
for (var key in this.dimensions_) {
res[i++] = key + '-' + this.dimensions_[key];
}
return res.join('/');
};
/**
* Update the dimensions.
* @param {Object} dimensions Dimensions.
* @api
*/
ol.source.WMTS.prototype.updateDimensions = function(dimensions) {
ol.obj.assign(this.dimensions_, dimensions);
this.setKey(this.getKeyForDimensions_());
};
/**
* Generate source options from a capabilities object.
* @param {Object} wmtsCap An object representing the capabilities document.
* @param {Object} config Configuration properties for the layer. Defaults for
* the layer will apply if not provided.
*
* Required config properties:
* - layer - {string} The layer identifier.
*
* Optional config properties:
* - matrixSet - {string} The matrix set identifier, required if there is
* more than one matrix set in the layer capabilities.
* - projection - {string} The desired CRS when no matrixSet is specified.
* eg: "EPSG:3857". If the desired projection is not available,
* an error is thrown.
* - requestEncoding - {string} url encoding format for the layer. Default is
* the first tile url format found in the GetCapabilities response.
* - style - {string} The name of the style
* - format - {string} Image format for the layer. Default is the first
* format returned in the GetCapabilities response.
* @return {olx.source.WMTSOptions} WMTS source options object.
* @api
*/
ol.source.WMTS.optionsFromCapabilities = function(wmtsCap, config) {
// TODO: add support for TileMatrixLimits
ol.DEBUG && console.assert(config['layer'],
'config "layer" must not be null');
var layers = wmtsCap['Contents']['Layer'];
var l = ol.array.find(layers, function(elt, index, array) {
return elt['Identifier'] == config['layer'];
});
ol.DEBUG && console.assert(l, 'found a matching layer in Contents/Layer');
ol.DEBUG && console.assert(l['TileMatrixSetLink'].length > 0,
'layer has TileMatrixSetLink');
var tileMatrixSets = wmtsCap['Contents']['TileMatrixSet'];
var idx, matrixSet, matrixLimits;
if (l['TileMatrixSetLink'].length > 1) {
if ('projection' in config) {
idx = ol.array.findIndex(l['TileMatrixSetLink'],
function(elt, index, array) {
var tileMatrixSet = ol.array.find(tileMatrixSets, function(el) {
return el['Identifier'] == elt['TileMatrixSet'];
});
var supportedCRS = tileMatrixSet['SupportedCRS'].replace(/urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3');
var proj1 = ol.proj.get(supportedCRS);
var proj2 = ol.proj.get(config['projection']);
if (proj1 && proj2) {
return ol.proj.equivalent(proj1, proj2);
} else {
return supportedCRS == config['projection'];
}
});
} else {
idx = ol.array.findIndex(l['TileMatrixSetLink'],
function(elt, index, array) {
return elt['TileMatrixSet'] == config['matrixSet'];
});
}
} else {
idx = 0;
}
if (idx < 0) {
idx = 0;
}
matrixSet = /** @type {string} */
(l['TileMatrixSetLink'][idx]['TileMatrixSet']);
matrixLimits = /** @type {Array.<Object>} */
(l['TileMatrixSetLink'][idx]['TileMatrixSetLimits']);
ol.DEBUG && console.assert(matrixSet, 'TileMatrixSet must not be null');
var format = /** @type {string} */ (l['Format'][0]);
if ('format' in config) {
format = config['format'];
}
idx = ol.array.findIndex(l['Style'], function(elt, index, array) {
if ('style' in config) {
return elt['Title'] == config['style'];
} else {
return elt['isDefault'];
}
});
if (idx < 0) {
idx = 0;
}
var style = /** @type {string} */ (l['Style'][idx]['Identifier']);
var dimensions = {};
if ('Dimension' in l) {
l['Dimension'].forEach(function(elt, index, array) {
var key = elt['Identifier'];
var value = elt['Default'];
if (value !== undefined) {
ol.DEBUG && console.assert(ol.array.includes(elt['Value'], value),
'default value contained in values');
} else {
value = elt['Value'][0];
}
ol.DEBUG && console.assert(value !== undefined, 'value could be found');
dimensions[key] = value;
});
}
var matrixSets = wmtsCap['Contents']['TileMatrixSet'];
var matrixSetObj = ol.array.find(matrixSets, function(elt, index, array) {
return elt['Identifier'] == matrixSet;
});
ol.DEBUG && console.assert(matrixSetObj,
'found matrixSet in Contents/TileMatrixSet');
var projection;
if ('projection' in config) {
projection = ol.proj.get(config['projection']);
} else {
projection = ol.proj.get(matrixSetObj['SupportedCRS'].replace(
/urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
}
var wgs84BoundingBox = l['WGS84BoundingBox'];
var extent, wrapX;
if (wgs84BoundingBox !== undefined) {
var wgs84ProjectionExtent = ol.proj.get('EPSG:4326').getExtent();
wrapX = (wgs84BoundingBox[0] == wgs84ProjectionExtent[0] &&
wgs84BoundingBox[2] == wgs84ProjectionExtent[2]);
extent = ol.proj.transformExtent(
wgs84BoundingBox, 'EPSG:4326', projection);
var projectionExtent = projection.getExtent();
if (projectionExtent) {
// If possible, do a sanity check on the extent - it should never be
// bigger than the validity extent of the projection of a matrix set.
if (!ol.extent.containsExtent(projectionExtent, extent)) {
extent = undefined;
}
}
}
var tileGrid = ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet(
matrixSetObj, extent, matrixLimits);
/** @type {!Array.<string>} */
var urls = [];
var requestEncoding = config['requestEncoding'];
requestEncoding = requestEncoding !== undefined ? requestEncoding : '';
ol.DEBUG && console.assert(
ol.array.includes(['REST', 'RESTful', 'KVP', ''], requestEncoding),
'requestEncoding (%s) is one of "REST", "RESTful", "KVP" or ""',
requestEncoding);
if ('OperationsMetadata' in wmtsCap && 'GetTile' in wmtsCap['OperationsMetadata']) {
var gets = wmtsCap['OperationsMetadata']['GetTile']['DCP']['HTTP']['Get'];
ol.DEBUG && console.assert(gets.length >= 1);
for (var i = 0, ii = gets.length; i < ii; ++i) {
var constraint = ol.array.find(gets[i]['Constraint'], function(element) {
return element['name'] == 'GetEncoding';
});
var encodings = constraint['AllowedValues']['Value'];
ol.DEBUG && console.assert(encodings.length >= 1);
if (requestEncoding === '') {
// requestEncoding not provided, use the first encoding from the list
requestEncoding = encodings[0];
}
if (requestEncoding === ol.source.WMTS.RequestEncoding.KVP) {
if (ol.array.includes(encodings, ol.source.WMTS.RequestEncoding.KVP)) {
urls.push(/** @type {string} */ (gets[i]['href']));
}
} else {
break;
}
}
}
if (urls.length === 0) {
requestEncoding = ol.source.WMTS.RequestEncoding.REST;
l['ResourceURL'].forEach(function(element) {
if (element['resourceType'] === 'tile') {
format = element['format'];
urls.push(/** @type {string} */ (element['template']));
}
});
}
ol.DEBUG && console.assert(urls.length > 0, 'At least one URL found');
return {
urls: urls,
layer: config['layer'],
matrixSet: matrixSet,
format: format,
projection: projection,
requestEncoding: requestEncoding,
tileGrid: tileGrid,
style: style,
dimensions: dimensions,
wrapX: wrapX
};
};
/**
* Request encoding. One of 'KVP', 'REST'.
* @enum {string}
*/
ol.source.WMTS.RequestEncoding = {
KVP: 'KVP', // see spec §8
REST: 'REST' // see spec §10
};