mirror of
https://github.com/Luzifer/staticmap.git
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114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
package main
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import (
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"crypto/sha256"
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"fmt"
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"strings"
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staticMap "github.com/Luzifer/go-staticmaps"
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"github.com/golang/geo/s2"
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"github.com/pkg/errors"
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)
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type postMapEnvelope struct {
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Center postMapPoint `json:"center"`
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Zoom int `json:"zoom"`
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Markers postMapMarkers `json:"markers"`
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Width int `json:"width"`
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Height int `json:"height"`
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DisableAttribution bool `json:"disable_attribution"`
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Overlays postMapOverlay `json:"overlays"`
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}
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func (p postMapEnvelope) toGenerateMapConfig() (generateMapConfig, error) {
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result := generateMapConfig{
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Center: p.Center.getPoint(),
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Zoom: p.Zoom,
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Width: p.Width,
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Height: p.Height,
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DisableAttribution: p.DisableAttribution,
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}
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if p.Width > mapMaxX || p.Height > mapMaxY {
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return generateMapConfig{}, errors.Errorf("map size exceeds allowed bounds of %dx%d", mapMaxX, mapMaxY)
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}
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var err error
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if result.Markers, err = p.Markers.toMarkers(); err != nil {
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return generateMapConfig{}, err
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}
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if result.Overlays, err = p.Overlays.toOverlays(); err != nil {
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return generateMapConfig{}, err
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}
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return result, nil
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}
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type postMapMarker struct {
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Size string `json:"size"`
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Color string `json:"color"`
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Coord postMapPoint `json:"coord"`
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}
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func (p postMapMarker) String() string {
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parts := []string{}
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if p.Size != "" {
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parts = append(parts, fmt.Sprintf("size:%s", p.Size))
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}
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if p.Color != "" {
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parts = append(parts, fmt.Sprintf("color:%s", p.Color))
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}
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parts = append(parts, p.Coord.String())
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return strings.Join(parts, "|")
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}
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type postMapMarkers []postMapMarker
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func (p postMapMarkers) toMarkers() ([]marker, error) {
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raw := []string{}
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for _, pm := range p {
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raw = append(raw, pm.String())
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}
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return parseMarkerLocations(raw)
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}
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type postMapPoint struct {
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Lat float64 `json:"lat"`
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Lon float64 `json:"lon"`
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}
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func (p postMapPoint) String() string {
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return fmt.Sprintf("%f,%f", p.Lat, p.Lon)
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}
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func (p postMapPoint) getPoint() s2.LatLng {
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return s2.LatLngFromDegrees(p.Lat, p.Lon)
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}
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type postMapOverlay []string
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func (p postMapOverlay) toOverlays() ([]*staticMap.TileProvider, error) {
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result := []*staticMap.TileProvider{}
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for _, pat := range p {
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for _, v := range []string{`{0}`, `{1}`, `{2}`} {
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if !strings.Contains(pat, v) {
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return nil, errors.Errorf("placeholder %q not found in pattern %q", v, pat)
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}
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}
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pat = strings.NewReplacer(`{0}`, `%[2]d`, `{1}`, `%[3]d`, `{2}`, `%[4]d`).Replace(pat)
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result = append(result, &staticMap.TileProvider{
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Name: fmt.Sprintf("%x", sha256.Sum256([]byte(pat))),
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TileSize: 256, //nolint:gomnd
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URLPattern: pat,
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})
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}
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return result, nil
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}
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