Method getTileLayerInfo

src/openlayers/mapping/WebMap.js:4483–4518

* @private * @function WebMap.prototype.getTileLayerInfo * @description 获取地图服务的信息 * @param {string} url 地图服务的url（没有地图名字） * @param {boolean | undefined} proxy 是否需要代理 * @returns {Promise } 地图服务信息

(url, proxy)

   * @returns {Promise<T | never>} 地图服务信息
   */
  getTileLayerInfo(url, proxy) {
    let that = this,
      epsgCode = that.baseProjection.split('EPSG:')[1];
    let requestUrl = that.getRequestUrl(`${url}/maps.json`, proxy);
    return FetchRequest.get(requestUrl, null, {
      withCredentials: this.isCredentail(url, proxy)
    })
      .then(function (response) {
        return response.json();
      })
      .then(function (mapInfo) {
        let promises = [];
        if (mapInfo) {
          mapInfo.forEach(function (info) {
            let mapUrl = that.getRequestUrl(
              `${info.path}.json?prjCoordSys=${encodeURI(JSON.stringify({ epsgCode: epsgCode }))}`,
              proxy
            );
            let promise = FetchRequest.get(mapUrl, null, {
              withCredentials: that.isCredentail(mapUrl, proxy)
            })
              .then(function (response) {
                return response.json();
              })
              .then(function (restMapInfo) {
                restMapInfo.url = info.path;
                return restMapInfo;
              });
            promises.push(promise);
          });
        }
        return Promise.all(promises).then(function (allRestMaps) {
          return allRestMaps;
        });
      });
  }

  /**
   * 通过 WKT 参数扩展支持多坐标系。