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maps.go
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maps.go
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package register
import (
"html"
"regexp"
"strings"
"github.com/go-spatial/geom"
"github.com/go-spatial/tegola/atlas"
"github.com/go-spatial/tegola/config"
"github.com/go-spatial/tegola/provider"
)
func webMercatorMapFromConfigMap(cfg config.Map) (newMap atlas.Map) {
newMap = atlas.NewWebMercatorMap(string(cfg.Name))
newMap.Attribution = SanitizeAttribution(string(cfg.Attribution))
// convert from env package
for i, v := range cfg.Center {
newMap.Center[i] = float64(v)
}
if len(cfg.Bounds) == 4 {
newMap.Bounds = geom.NewExtent(
[2]float64{float64(cfg.Bounds[0]), float64(cfg.Bounds[1])},
[2]float64{float64(cfg.Bounds[2]), float64(cfg.Bounds[3])},
)
}
if cfg.TileBuffer != nil {
newMap.TileBuffer = uint64(*cfg.TileBuffer)
}
return newMap
}
func layerInfosFindByName(infos []provider.LayerInfo, name string) provider.LayerInfo {
if len(infos) == 0 {
return nil
}
for i := range infos {
if infos[i].Name() == name {
return infos[i]
}
}
return nil
}
func atlasLayerFromConfigLayer(cfg *config.MapLayer, mapName string, layerProvider provider.Layerer) (layer atlas.Layer, err error) {
var (
// providerLayer is primary used for error reporting.
providerLayer = string(cfg.ProviderLayer)
ok bool
)
// read the provider's layer names
// don't care about the error.
providerName, layerName, _ := cfg.ProviderLayerName()
layerInfos, err := layerProvider.Layers()
if err != nil {
return layer, ErrFetchingLayerInfo{
Provider: providerName,
Err: err,
}
}
layerInfo := layerInfosFindByName(layerInfos, layerName)
if layerInfo == nil {
return layer, ErrProviderLayerNotRegistered{
MapName: mapName,
ProviderLayer: providerLayer,
Provider: providerName,
}
}
layer.GeomType = layerInfo.GeomType()
if cfg.DefaultTags != nil {
if layer.DefaultTags, ok = cfg.DefaultTags.(map[string]interface{}); !ok {
return layer, ErrDefaultTagsInvalid{
ProviderLayer: providerLayer,
}
}
}
// if layerProvider is not a provider.Tiler this will return nil, so
// no need to check ok, as nil is what we want here.
layer.Provider, _ = layerProvider.(provider.Tiler)
layer.Name = string(cfg.Name)
layer.ProviderLayerName = layerName
layer.DontSimplify = bool(cfg.DontSimplify)
layer.DontClip = bool(cfg.DontClip)
if cfg.MinZoom != nil {
layer.MinZoom = uint(*cfg.MinZoom)
}
if cfg.MaxZoom != nil {
layer.MaxZoom = uint(*cfg.MaxZoom)
}
return layer, nil
}
func selectProvider(name string, mapName string, newMap *atlas.Map, providers map[string]provider.TilerUnion) (provider.Layerer, error) {
if newMap.HasMVTProvider() {
if newMap.MVTProviderName() != name {
return nil, config.ErrMVTDifferentProviders{
Original: newMap.MVTProviderName(),
Current: name,
}
}
return newMap.MVTProvider(), nil
}
if prvd, ok := providers[name]; ok {
// Need to see what type of provider we got.
if prvd.Std != nil {
return prvd.Std, nil
}
if prvd.Mvt == nil {
return nil, ErrProviderNotFound{name}
}
if len(newMap.Layers) != 0 {
return nil, config.ErrMixedProviders{
Map: string(mapName),
}
}
return newMap.SetMVTProvider(name, prvd.Mvt), nil
}
return nil, ErrProviderNotFound{name}
}
// Maps registers maps with with atlas
func Maps(a *atlas.Atlas, maps []config.Map, providers map[string]provider.TilerUnion) error {
var (
layerer provider.Layerer
)
// iterate our maps
for _, m := range maps {
newMap := webMercatorMapFromConfigMap(m)
// iterate our layers
for _, l := range m.Layers {
providerName, _, err := l.ProviderLayerName()
if err != nil {
return ErrProviderLayerInvalid{
ProviderLayer: string(l.ProviderLayer),
Map: string(m.Name),
}
}
// find our layer provider
layerer, err = selectProvider(providerName, string(m.Name), &newMap, providers)
if err != nil {
return err
}
layer, err := atlasLayerFromConfigLayer(&l, string(m.Name), layerer)
if err != nil {
return err
}
newMap.Layers = append(newMap.Layers, layer)
}
a.AddMap(newMap)
}
return nil
}
// Find allow HTML tag
var allowTags = regexp.MustCompile(`<(a\s(.+?)|/a)>`)
// Escapes HTML special characters except allow tags
func SanitizeAttribution(attribution string) string {
result := html.EscapeString(attribution)
tags := allowTags.FindAllString(result, -1)
for _, tag := range tags {
result = strings.Replace(result, tag, html.UnescapeString(tag), 1)
}
return result
}