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import buildModuleUrl from "./buildModuleUrl.js";
import Check from "./Check.js";
import Credit from "./Credit.js";
import defined from "./defined.js";
import GoogleEarthEnterpriseTileInformation from "./GoogleEarthEnterpriseTileInformation.js";
import isBitSet from "./isBitSet.js";
import loadAndExecuteScript from "./loadAndExecuteScript.js";
import CesiumMath from "./Math.js";
import Request from "./Request.js";
import Resource from "./Resource.js";
import RuntimeError from "./RuntimeError.js";
import TaskProcessor from "./TaskProcessor.js";
function stringToBuffer(str) {
const len = str.length;
const buffer = new ArrayBuffer(len);
const ui8 = new Uint8Array(buffer);
for (let i = 0; i < len; ++i) {
ui8[i] = str.charCodeAt(i);
}
return buffer;
}
// Decodes packet with a key that has been around since the beginning of Google Earth Enterprise
const defaultKey = stringToBuffer(
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);
/**
* <div class="notice">
* To construct GoogleEarthEnterpriseMetadata, call {@link GoogleEarthEnterpriseMetadata.fromUrl}. Do not call the constructor directly.
* </div>
*
* Provides metadata using the Google Earth Enterprise REST API. This is used by the GoogleEarthEnterpriseImageryProvider
* and GoogleEarthEnterpriseTerrainProvider to share metadata requests.
*
* @alias GoogleEarthEnterpriseMetadata
* @constructor
*
* @see GoogleEarthEnterpriseImageryProvider
* @see GoogleEarthEnterpriseTerrainProvider
*
*/
function GoogleEarthEnterpriseMetadata(resourceOrUrl) {
/**
* True if imagery is available.
* @type {boolean}
* @default true
*/
this.imageryPresent = true;
/**
* True if imagery is sent as a protocol buffer, false if sent as plain images. If undefined we will try both.
* @type {boolean|undefined}
* @default undefined
*/
this.protoImagery = undefined;
/**
* True if terrain is available.
* @type {boolean}
* @default true
*/
this.terrainPresent = true;
/**
* Exponent used to compute constant to calculate negative height values.
* @type {number}
* @default 32
*/
this.negativeAltitudeExponentBias = 32;
/**
* Threshold where any numbers smaller are actually negative values. They are multiplied by -2^negativeAltitudeExponentBias.
* @type {number}
* @default EPSILON12
*/
this.negativeAltitudeThreshold = CesiumMath.EPSILON12;
/**
* Dictionary of provider id to copyright strings.
* @type {object}
* @default {}
*/
this.providers = {};
/**
* Key used to decode packets
* @type {ArrayBuffer}
*/
this.key = undefined;
this._resource = undefined;
this._quadPacketVersion = 1;
this._tileInfo = {};
this._subtreePromises = {};
}
Object.defineProperties(GoogleEarthEnterpriseMetadata.prototype, {
/**
* Gets the name of the Google Earth Enterprise server.
* @memberof GoogleEarthEnterpriseMetadata.prototype
* @type {string}
* @readonly
*/
url: {
get: function () {
return this._resource.url;
},
},
/**
* Gets the proxy used for metadata requests.
* @memberof GoogleEarthEnterpriseMetadata.prototype
* @type {Proxy}
* @readonly
*/
proxy: {
get: function () {
return this._resource.proxy;
},
},
/**
* Gets the resource used for metadata requests.
* @memberof GoogleEarthEnterpriseMetadata.prototype
* @type {Resource}
* @readonly
*/
resource: {
get: function () {
return this._resource;
},
},
});
/**
* Creates a metadata object using the Google Earth Enterprise REST API. This is used by the GoogleEarthEnterpriseImageryProvider
* and GoogleEarthEnterpriseTerrainProvider to share metadata requests.
*
* @param {Resource|string} resourceOrUrl The url of the Google Earth Enterprise server hosting the imagery.
*
* @returns {Promise<GoogleEarthEnterpriseMetadata>} A promise which resolves to the created GoogleEarthEnterpriseMetadata instance/
*/
GoogleEarthEnterpriseMetadata.fromUrl = async function (resourceOrUrl) {
//>>includeStart('debug', pragmas.debug);
Check.defined("resourceOrUrl", resourceOrUrl);
//>>includeEnd('debug');
let url = resourceOrUrl;
if (typeof url !== "string" && !(url instanceof Resource)) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.string("resourceOrUrl.url", resourceOrUrl.url);
//>>includeEnd('debug');
url = resourceOrUrl.url;
}
const resource = Resource.createIfNeeded(url);
resource.appendForwardSlash();
const metadata = new GoogleEarthEnterpriseMetadata();
metadata._resource = resource;
try {
await requestDbRoot(metadata);
await metadata.getQuadTreePacket("", metadata._quadPacketVersion);
} catch (error) {
const message = `An error occurred while accessing ${
getMetadataResource(metadata, "", 1).url
}: ${error}`;
throw new RuntimeError(message);
}
return metadata;
};
/**
* Converts a tiles (x, y, level) position into a quadkey used to request an image
* from a Google Earth Enterprise server.
*
* @param {number} x The tile's x coordinate.
* @param {number} y The tile's y coordinate.
* @param {number} level The tile's zoom level.
*
* @see GoogleEarthEnterpriseMetadata#quadKeyToTileXY
*/
GoogleEarthEnterpriseMetadata.tileXYToQuadKey = function (x, y, level) {
let quadkey = "";
for (let i = level; i >= 0; --i) {
const bitmask = 1 << i;
let digit = 0;
// Tile Layout
// ___ ___
//| | |
//| 3 | 2 |
//|-------|
//| 0 | 1 |
//|___|___|
//
if (!isBitSet(y, bitmask)) {
// Top Row
digit |= 2;
if (!isBitSet(x, bitmask)) {
// Right to left
digit |= 1;
}
} else if (isBitSet(x, bitmask)) {
// Left to right
digit |= 1;
}
quadkey += digit;
}
return quadkey;
};
/**
* Converts a tile's quadkey used to request an image from a Google Earth Enterprise server into the
* (x, y, level) position.
*
* @param {string} quadkey The tile's quad key
*
* @see GoogleEarthEnterpriseMetadata#tileXYToQuadKey
*/
GoogleEarthEnterpriseMetadata.quadKeyToTileXY = function (quadkey) {
let x = 0;
let y = 0;
const level = quadkey.length - 1;
for (let i = level; i >= 0; --i) {
const bitmask = 1 << i;
const digit = +quadkey[level - i];
if (isBitSet(digit, 2)) {
// Top Row
if (!isBitSet(digit, 1)) {
// // Right to left
x |= bitmask;
}
} else {
y |= bitmask;
if (isBitSet(digit, 1)) {
// Left to right
x |= bitmask;
}
}
}
return {
x: x,
y: y,
level: level,
};
};
GoogleEarthEnterpriseMetadata.prototype.isValid = function (quadKey) {
let info = this.getTileInformationFromQuadKey(quadKey);
Iif (defined(info)) {
return info !== null;
}
let valid = true;
let q = quadKey;
let last;
while (q.length > 1) {
last = q.substring(q.length - 1);
q = q.substring(0, q.length - 1);
info = this.getTileInformationFromQuadKey(q);
if (defined(info)) {
Iif (!info.hasSubtree() && !info.hasChild(parseInt(last))) {
// We have no subtree or child available at some point in this node's ancestry
valid = false;
}
break;
} else Iif (info === null) {
// Some node in the ancestry was loaded and said there wasn't a subtree
valid = false;
break;
}
}
return valid;
};
const taskProcessor = new TaskProcessor("decodeGoogleEarthEnterprisePacket");
/**
* Retrieves a Google Earth Enterprise quadtree packet.
*
* @param {string} [quadKey=''] The quadkey to retrieve the packet for.
* @param {number} [version=1] The cnode version to be used in the request.
* @param {Request} [request] The request object. Intended for internal use only.
*
* @private
*/
GoogleEarthEnterpriseMetadata.prototype.getQuadTreePacket = function (
quadKey,
version,
request,
) {
version = version ?? 1;
quadKey = quadKey ?? "";
const resource = getMetadataResource(this, quadKey, version, request);
const promise = resource.fetchArrayBuffer();
Iif (!defined(promise)) {
return undefined; // Throttled
}
const tileInfo = this._tileInfo;
const key = this.key;
return promise.then(function (metadata) {
const decodePromise = taskProcessor.scheduleTask(
{
buffer: metadata,
quadKey: quadKey,
type: "Metadata",
key: key,
},
[metadata],
);
return decodePromise.then(function (result) {
let root;
let topLevelKeyLength = -1;
Iif (quadKey !== "") {
// Root tile has no data except children bits, so put them into the tile info
topLevelKeyLength = quadKey.length + 1;
const top = result[quadKey];
root = tileInfo[quadKey];
root._bits |= top._bits;
delete result[quadKey];
}
// Copy the resulting objects into tileInfo
// Make sure we start with shorter quadkeys first, so we know the parents have
// already been processed. Otherwise we can lose ancestorHasTerrain along the way.
const keys = Object.keys(result);
keys.sort(function (a, b) {
return a.length - b.length;
});
const keysLength = keys.length;
for (let i = 0; i < keysLength; ++i) {
const key = keys[i];
const r = result[key];
if (r !== null) {
const info = GoogleEarthEnterpriseTileInformation.clone(result[key]);
const keyLength = key.length;
Iif (keyLength === topLevelKeyLength) {
info.setParent(root);
} else Iif (keyLength > 1) {
const parent = tileInfo[key.substring(0, key.length - 1)];
info.setParent(parent);
}
tileInfo[key] = info;
} else {
tileInfo[key] = null;
}
}
});
});
};
/**
* Populates the metadata subtree down to the specified tile.
*
* @param {number} x The tile X coordinate.
* @param {number} y The tile Y coordinate.
* @param {number} level The tile level.
* @param {Request} [request] The request object. Intended for internal use only.
*
* @returns {Promise<GoogleEarthEnterpriseTileInformation>} A promise that resolves to the tile info for the requested quad key
*
* @private
*/
GoogleEarthEnterpriseMetadata.prototype.populateSubtree = function (
x,
y,
level,
request,
) {
const quadkey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
return populateSubtree(this, quadkey, request);
};
function populateSubtree(that, quadKey, request) {
const tileInfo = that._tileInfo;
let q = quadKey;
let t = tileInfo[q];
// If we have tileInfo make sure sure it is not a node with a subtree that's not loaded
if (defined(t) && (!t.hasSubtree() || t.hasChildren())) {
return t;
}
while (t === undefined && q.length > 1) {
q = q.substring(0, q.length - 1);
t = tileInfo[q];
}
let subtreeRequest;
const subtreePromises = that._subtreePromises;
let promise = subtreePromises[q];
Iif (defined(promise)) {
return promise.then(function () {
// Recursively call this in case we need multiple subtree requests
subtreeRequest = new Request({
throttle: request.throttle,
throttleByServer: request.throttleByServer,
type: request.type,
priorityFunction: request.priorityFunction,
});
return populateSubtree(that, quadKey, subtreeRequest);
});
}
// t is either
// null so one of its parents was a leaf node, so this tile doesn't exist
// exists but doesn't have a subtree to request
// undefined so no parent exists - this shouldn't ever happen once the provider is ready
Iif (!defined(t) || !t.hasSubtree()) {
return Promise.reject(
new RuntimeError(`Couldn't load metadata for tile ${quadKey}`),
);
}
// We need to split up the promise here because when will execute syncronously if getQuadTreePacket
// is already resolved (like in the tests), so subtreePromises will never get cleared out.
// Only the initial request will also remove the promise from subtreePromises.
promise = that.getQuadTreePacket(q, t.cnodeVersion, request);
Iif (!defined(promise)) {
return undefined;
}
subtreePromises[q] = promise;
return promise
.then(function () {
// Recursively call this in case we need multiple subtree requests
subtreeRequest = new Request({
throttle: request.throttle,
throttleByServer: request.throttleByServer,
type: request.type,
priorityFunction: request.priorityFunction,
});
return populateSubtree(that, quadKey, subtreeRequest);
})
.finally(function () {
delete subtreePromises[q];
});
}
/**
* Gets information about a tile
*
* @param {number} x The tile X coordinate.
* @param {number} y The tile Y coordinate.
* @param {number} level The tile level.
* @returns {GoogleEarthEnterpriseTileInformation|undefined} Information about the tile or undefined if it isn't loaded.
*
* @private
*/
GoogleEarthEnterpriseMetadata.prototype.getTileInformation = function (
x,
y,
level,
) {
const quadkey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
return this._tileInfo[quadkey];
};
/**
* Gets information about a tile from a quadKey
*
* @param {string} quadkey The quadkey for the tile
* @returns {GoogleEarthEnterpriseTileInformation|undefined} Information about the tile or undefined if it isn't loaded.
*
* @private
*/
GoogleEarthEnterpriseMetadata.prototype.getTileInformationFromQuadKey =
function (quadkey) {
return this._tileInfo[quadkey];
};
function getMetadataResource(that, quadKey, version, request) {
return that._resource.getDerivedResource({
url: `flatfile?q2-0${quadKey}-q.${version.toString()}`,
request: request,
});
}
let dbrootParser;
let dbrootParserPromise;
function requestDbRoot(that) {
const resource = that._resource.getDerivedResource({
url: "dbRoot.v5",
queryParameters: {
output: "proto",
},
});
if (!defined(dbrootParserPromise)) {
const url = buildModuleUrl("ThirdParty/google-earth-dbroot-parser.js");
const oldValue = window.cesiumGoogleEarthDbRootParser;
dbrootParserPromise = loadAndExecuteScript(url).then(function () {
dbrootParser = window.cesiumGoogleEarthDbRootParser(protobuf);
Iif (defined(oldValue)) {
window.cesiumGoogleEarthDbRootParser = oldValue;
} else {
delete window.cesiumGoogleEarthDbRootParser;
}
});
}
return dbrootParserPromise
.then(function () {
return resource.fetchArrayBuffer();
})
.then(function (buf) {
const encryptedDbRootProto = dbrootParser.EncryptedDbRootProto.decode(
new Uint8Array(buf),
);
let byteArray = encryptedDbRootProto.encryptionData;
let offset = byteArray.byteOffset;
let end = offset + byteArray.byteLength;
const key = (that.key = byteArray.buffer.slice(offset, end));
byteArray = encryptedDbRootProto.dbrootData;
offset = byteArray.byteOffset;
end = offset + byteArray.byteLength;
const dbRootCompressed = byteArray.buffer.slice(offset, end);
return taskProcessor.scheduleTask(
{
buffer: dbRootCompressed,
type: "DbRoot",
key: key,
},
[dbRootCompressed],
);
})
.then(function (result) {
const dbRoot = dbrootParser.DbRootProto.decode(
new Uint8Array(result.buffer),
);
that.imageryPresent = dbRoot.imageryPresent ?? that.imageryPresent;
that.protoImagery = dbRoot.protoImagery;
that.terrainPresent = dbRoot.terrainPresent ?? that.terrainPresent;
if (defined(dbRoot.endSnippet) && defined(dbRoot.endSnippet.model)) {
const model = dbRoot.endSnippet.model;
that.negativeAltitudeExponentBias =
model.negativeAltitudeExponentBias ??
that.negativeAltitudeExponentBias;
that.negativeAltitudeThreshold =
model.compressedNegativeAltitudeThreshold ??
that.negativeAltitudeThreshold;
}
if (defined(dbRoot.databaseVersion)) {
that._quadPacketVersion =
dbRoot.databaseVersion.quadtreeVersion ?? that._quadPacketVersion;
}
const providers = that.providers;
const providerInfo = dbRoot.providerInfo ?? [];
const count = providerInfo.length;
for (let i = 0; i < count; ++i) {
const provider = providerInfo[i];
const copyrightString = provider.copyrightString;
if (defined(copyrightString)) {
providers[provider.providerId] = new Credit(copyrightString.value);
}
}
})
.catch(function () {
// Just eat the error and use the default values.
console.log(`Failed to retrieve ${resource.url}. Using defaults.`);
that.key = defaultKey;
});
}
export default GoogleEarthEnterpriseMetadata;
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