IonRasterOverlay.h

#pragma once
 
#include <CesiumAsync/IAssetRequest.h>
#include <CesiumAsync/NetworkAssetDescriptor.h>
#include <CesiumAsync/SharedAssetDepot.h>
#include <CesiumGeospatial/Ellipsoid.h>
#include <CesiumRasterOverlays/Library.h>
#include <CesiumRasterOverlays/RasterOverlay.h>
#include <CesiumUtility/SharedAsset.h>
 
#include <chrono>
#include <memory>
#include <optional>
#include <string>
#include <unordered_map>
#include <variant>
#include <vector>
 
namespace CesiumRasterOverlays {

class CESIUMRASTEROVERLAYS_API IonRasterOverlay : public RasterOverlay {
public:
  IonRasterOverlay(
      const std::string& name,
      int64_t ionAssetID,
      const std::string& ionAccessToken,
      const RasterOverlayOptions& overlayOptions = {},
      const std::string& ionAssetEndpointUrl = "https://api.cesium.com/");
  virtual ~IonRasterOverlay() override;

  const std::optional<std::string>& getAssetOptions() const noexcept;

  void setAssetOptions(const std::optional<std::string>& options) noexcept;
 
  virtual CesiumAsync::Future<CreateTileProviderResult> createTileProvider(
      const CreateRasterOverlayTileProviderParameters& parameters)
      const override;
 
protected:
  IonRasterOverlay(
      const std::string& name,
      const std::string& overlayUrl,
      const std::string& ionAccessToken,
      bool needsAuthHeader,
      const RasterOverlayOptions& overlayOptions = {});
 
private:
  std::string _overlayUrl;
  std::string _ionAccessToken;
  bool _needsAuthHeader;
  std::optional<std::string> _assetOptions;
 
  class TileProvider;
 
  struct AssetEndpointAttribution {
    std::string html;
    bool collapsible = true;
  };
 
  struct ExternalAssetEndpoint
      : public CesiumUtility::SharedAsset<ExternalAssetEndpoint> {
    ExternalAssetEndpoint() noexcept = default;
    ~ExternalAssetEndpoint() noexcept = default;
    ExternalAssetEndpoint(const ExternalAssetEndpoint&) noexcept = default;
    ExternalAssetEndpoint(ExternalAssetEndpoint&&) noexcept = default;
 
    std::chrono::steady_clock::time_point requestTime{};
    std::string externalType{};
    std::vector<AssetEndpointAttribution> attributions{};
    std::shared_ptr<CesiumAsync::IAssetRequest> pRequestThatFailed{};

    struct TileMapService {
      std::string url;
      std::string accessToken;
    };

    struct Azure2D {
      std::string url;
      std::string tilesetId;
      std::string key;
    };

    struct Google2D {
      std::string url;
      std::string key;
      std::string session;
      std::string expiry;
      std::string imageFormat;
      uint32_t tileWidth;
      uint32_t tileHeight;
    };

    struct Bing {
      std::string key;
      std::string url;
      std::string mapStyle;
      std::string culture;
    };
 
    std::variant<std::monostate, TileMapService, Azure2D, Google2D, Bing>
        options{};
 
    void parseAzure2DOptions(const rapidjson::Document& ionResponse);
    void parseGoogle2DOptions(const rapidjson::Document& ionResponse);
    void parseBingOptions(const rapidjson::Document& ionResponse);
    void parseTileMapServiceOptions(const rapidjson::Document& ionResponse);
  };
 
  static std::unordered_map<std::string, ExternalAssetEndpoint> endpointCache;
 
  using EndpointDepot = CesiumAsync::SharedAssetDepot<
      ExternalAssetEndpoint,
      CesiumAsync::NetworkAssetDescriptor,
      RasterOverlayExternals>;
 
  static CesiumUtility::IntrusivePointer<EndpointDepot> getEndpointCache();
};
 
} // namespace CesiumRasterOverlays