featureserver
Version:
*An open source implementation of the GeoServices specification*
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<h1><a href="../index.html">All files</a> / <a href="index.html">lib</a> server-info-route-handler.js</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const _ = require('lodash')
const { calculateBounds } = require('@terraformer/spatial')
const {
getCollectionCrs,
getGeometryTypeFromGeojson,
normalizeExtent,
normalizeSpatialReference,
normalizeInputData
} = require('./helpers')
const { serverMetadata: serverMetadataDefaults } = require('./defaults')
const {
CURRENT_VERSION,
FULL_VERSION
} = require('./constants')
const debug = process.env.KOOP_LOG_LEVEL === 'debug' || process.env.LOG_LEVEL === 'debug'
function serverMetadata (json, req = {}) {
const {
query = {}
} = req
const { extent, metadata = {}, ...rest } = json
const {
maxRecordCount,
hasStaticData,
copyrightText,
description: providerLayerDescription,
serviceDescription: providerServiceDescription
} = { ...metadata, ...rest }
const spatialReference = getSpatialReference(json, query)
const { layers, tables, relationships } = normalizeInputData(json)
// TODO reproject default extents when non WGS84 CRS is found or passed
const fullExtent = getServiceExtent({ extent, metadata, layers, spatialReference })
const {
currentVersion = CURRENT_VERSION,
fullVersion = FULL_VERSION,
serviceDescription
} = _.get(req, 'app.locals.config.featureServer', {})
return _.defaults({
currentVersion,
fullVersion,
spatialReference,
fullExtent,
initialExtent: fullExtent,
layers: layers.map(layerInfo),
tables: tables.map((json, idx) => {
return tableInfo(json, layers.length + idx)
}),
relationships: relationships.map(relationshipInfo),
supportsRelationshipsResource: relationships && relationships.length > 0,
serviceDescription: serviceDescription || providerServiceDescription || providerLayerDescription,
copyrightText: copyrightText,
maxRecordCount: maxRecordCount || _.get(layers, '[0].metadata.maxRecordCount'),
hasStaticData: typeof hasStaticData === 'boolean' ? hasStaticData : false
}, serverMetadataDefaults)
}
function getServiceExtent ({ extent, metadata = <span class="branch-0 cbranch-no" title="branch not covered" >{},</span> layers, spatialReference = { wkid: 4326, latestWkid: 4326 } }) {
if (extent || metadata.extent) return normalizeExtent(extent || metadata.extent, spatialReference)
return calculateServiceExtentFromLayers(layers, spatialReference)
}
function calculateServiceExtentFromLayers (layers, spatialReference) {
try {
if (layers.length === 0) {
return
}
const layerBounds = layers.filter(layer => {
return _.has(layer, 'features[0]')
}).map(calculateBounds)
<span class="missing-if-branch" title="if path not taken" >I</span>if (layerBounds.length === 0) <span class="cstat-no" title="statement not covered" >return</span>
const { xmins, xmaxs, ymins, ymaxs } = layerBounds.reduce((accumulator, bounds) => {
const [xmin, ymin, xmax, ymax] = bounds
accumulator.xmins.push(xmin)
accumulator.xmaxs.push(xmax)
accumulator.ymins.push(ymin)
accumulator.ymaxs.push(ymax)
return accumulator
}, { xmins: [], xmaxs: [], ymins: [], ymaxs: [] })
return {
xmin: Math.min(...xmins),
xmax: Math.max(...xmaxs),
ymin: Math.min(...ymins),
ymax: Math.max(...ymaxs),
spatialReference
}
} catch (error) {
<span class="cstat-no" title="statement not covered" > if (debug) {</span>
<span class="cstat-no" title="statement not covered" > console.log(`Could not calculate extent from data: ${error.message}`)</span>
}
}
}
function layerInfo (json = <span class="branch-0 cbranch-no" title="branch not covered" >{},</span> defaultId) {
return formatInfo(json, defaultId, 'layer')
}
function tableInfo (json = <span class="branch-0 cbranch-no" title="branch not covered" >{},</span> defaultId) {
return formatInfo(json, defaultId, 'table')
}
function formatInfo (json = <span class="branch-0 cbranch-no" title="branch not covered" >{},</span> defaultId, type) {
const {
metadata: {
id,
name,
minScale = 0,
maxScale = 0,
defaultVisibility
} = {}
} = json
const defaultName = type === 'layer' ? `Layer_${id || defaultId}` : `Table_${id || defaultId}`
return {
id: id || defaultId,
name: name || defaultName,
parentLayerId: -1,
defaultVisibility: defaultVisibility !== false,
subLayerIds: null,
minScale,
maxScale,
geometryType: type === 'layer' ? getGeometryTypeFromGeojson(json) : undefined
}
}
function relationshipInfo (json = <span class="branch-0 cbranch-no" title="branch not covered" >{},</span> relationshipIndex) {
const {
id,
name
} = json
const defaultName = `Relationship_${id || relationshipIndex}`
return {
id: id || relationshipIndex,
name: name || <span class="branch-1 cbranch-no" title="branch not covered" >defaultName</span>
}
}
function getSpatialReference (collection, {
inputCrs,
sourceSR
}) {
if (!inputCrs && !sourceSR && _.isEmpty(collection)) return
const spatialReference = inputCrs || sourceSR || getCollectionCrs(collection)
if (!spatialReference) return
const { latestWkid, wkid, wkt } = normalizeSpatialReference(spatialReference)
<span class="missing-if-branch" title="else path not taken" >E</span>if (wkid) {
return { wkid, latestWkid }
}
<span class="cstat-no" title="statement not covered" > return { wkt }</span>
}
module.exports = serverMetadata
</pre></td></tr></table></pre>
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