From 16f60f6075402a8e600522fcdb8bb3a55c16323b Mon Sep 17 00:00:00 2001
From: Kai Vogelgesang <kai@leafbla.de>
Date: Mon, 12 Sep 2022 00:48:54 +0200
Subject: [PATCH] Fix violation of unmined license (distribution)

---
 frontend/src/pages/mining/Mining.svelte |  25 ++-
 frontend/src/pages/mining/unmined.ts    | 281 ++++--------------------
 frontend/src/stores.ts                  |   4 +-
 server/server/__init__.py               |   5 +-
 server/server/map_tiles.py              |  19 +-
 server/templates/metadata.js            |   8 +-
 server/templates/unmined.js             |   5 +
 7 files changed, 94 insertions(+), 253 deletions(-)
 create mode 100644 server/templates/unmined.js

diff --git a/frontend/src/pages/mining/Mining.svelte b/frontend/src/pages/mining/Mining.svelte
index b8d8ae7..c900cc9 100644
--- a/frontend/src/pages/mining/Mining.svelte
+++ b/frontend/src/pages/mining/Mining.svelte
@@ -1,36 +1,41 @@
 <script lang="ts">
     import Navbar from "../../Navbar.svelte";
+    import { unmined } from "../../stores";
 
     import {
-        Unmined,
+        ol_proxy,
         type UnminedOptions,
         type UnminedRegions,
     } from "./unmined";
 
     export let id = "map";
 
-    let unmined = new Unmined();
-
     type Metadata = {
         properties: UnminedOptions;
         regions: UnminedRegions;
     };
 
-    async function get_metadata() {
+    async function get_unmined() {
+        if ($unmined === null) {
+            let resp = await fetch("map/unmined.js");
+            let code = await resp.text();
+            $unmined = Function("ol", code).call({}, ol_proxy);
+        }
+
         let resp = await fetch("map/metadata.js");
         let code = await resp.text();
-        let meta = Function(code).call({}); // TODO possibly vulnerable to prototype pollution
+        let meta: Metadata = Function(code).call({}); // TODO possibly vulnerable to prototype pollution
         return meta;
     }
 
     function setupMap(node: HTMLDivElement, metadata: Metadata) {
-        unmined.map(node.id, metadata.properties, metadata.regions);
+        $unmined.map(node.id, metadata.properties, metadata.regions);
 
         return {
             destroy() {
-                if (unmined.openlayersMap) {
-                    unmined.openlayersMap.setTarget(null);
-                    unmined.openlayersMap = null;
+                if ($unmined.openlayersMap) {
+                    $unmined.openlayersMap.setTarget(null);
+                    $unmined.openlayersMap = null;
                 }
             },
         };
@@ -39,7 +44,7 @@
 
 <div class="map-outer">
     <Navbar />
-    {#await get_metadata() then metadata}
+    {#await get_unmined() then metadata}
         <div class="map-target" {id} use:setupMap={metadata} />
     {:catch err}
         <div class="container">
diff --git a/frontend/src/pages/mining/unmined.ts b/frontend/src/pages/mining/unmined.ts
index 5fb3693..50d1b3d 100644
--- a/frontend/src/pages/mining/unmined.ts
+++ b/frontend/src/pages/mining/unmined.ts
@@ -1,18 +1,15 @@
+import type OlMap from "ol/Map";
+import type VectorLayer from "ol/layer/Vector";
+import type VectorSource from "ol/source/Vector";
 import { boundingExtent } from "ol/extent";
-import { addCoordinateTransforms, Projection, transform } from "ol/proj";
+import { addCoordinateTransforms, Projection } from "ol/proj";
 import TileGrid from "ol/tilegrid/TileGrid";
-import { Tile } from "ol/layer";
 import XYZ from "ol/source/XYZ";
-import MousePosition from "ol/control/MousePosition";
+import Tile from "ol/layer/Tile";
 import { createStringXY } from "ol/coordinate";
-import OlMap from "ol/Map";
-import { defaults as controlDefaults } from "ol/control/defaults";
-import { Feature, View } from "ol";
-import { Point } from "ol/geom";
-import Style from "ol/style/Style";
-import Icon from "ol/style/Icon";
-import Text from "ol/style/Text";
-import Fill from "ol/style/Fill";
+import MousePosition from "ol/control/MousePosition";
+import { defaults } from "ol/control/defaults";
+import { Map, View } from "ol";
 import SourceVector from "ol/source/Vector";
 import LayerVector from "ol/layer/Vector";
 
@@ -30,227 +27,45 @@ export type UnminedOptions = {
     markers: Array<any>;
 }
 
-export type UnminedRegions = {}[];
+export type UnminedRegions = {
+    x: number,
+    y: number,
+    m: Uint32Array,
+}[];
 
-export class Unmined {
-    
-    openlayersMap: OlMap;
+export type Unmined = {
+    openlayersMap: OlMap,
+    map: (mapId: string, options: UnminedOptions, regions: UnminedRegions) => void,
+    createMarkersLayer: (markers, dataProjection, viewProjection) => VectorLayer<VectorSource>,
+}
 
-    map(mapId: string, options: UnminedOptions, regions: any[]) {
-        const dpiScale = window.devicePixelRatio ?? 1.0;
-
-        const worldMinX = options.minRegionX * 512;
-        const worldMinY = options.minRegionZ * 512;
-        const worldWidth = (options.maxRegionX + 1 - options.minRegionX) * 512;
-        const worldHeight = (options.maxRegionZ + 1 - options.minRegionZ) * 512;
-
-        const worldTileSize = 256;
-
-        const worldMaxZoomFactor = Math.pow(2, options.maxZoom);
-
-        // left, bottom, right, top, Y is negated
-        var mapExtent = boundingExtent([
-            [worldMinX * worldMaxZoomFactor, -(worldMinY + worldHeight) * worldMaxZoomFactor],
-            [(worldMinX + worldWidth) * worldMaxZoomFactor, -worldMinY * worldMaxZoomFactor]]);
-
-        var viewProjection = new Projection({
-            code: 'VIEW',
-            units: 'pixels',
-        });
-
-        var dataProjection = new Projection({
-            code: 'DATA',
-            units: 'pixels',
-        });
-
-        // Coordinate transformation between view and data
-        // OpenLayers Y is positive up, world Y is positive down
-        addCoordinateTransforms(viewProjection, dataProjection,
-            function (coordinate) {
-                return [coordinate[0], -coordinate[1]];
-            },
-            function (coordinate) {
-                return [coordinate[0], -coordinate[1]];
-            });
-
-        const mapZoomLevels = options.maxZoom - options.minZoom;
-        // Resolution for each OpenLayers zoom level        
-        var resolutions = new Array(mapZoomLevels + 1);
-        for (let z = 0; z < mapZoomLevels + 1; ++z) {
-            resolutions[mapZoomLevels - z] = Math.pow(2, z) * dpiScale / worldMaxZoomFactor;
-        }
-
-        var tileGrid = new TileGrid({
-            extent: mapExtent,
-            origin: [0, 0],
-            resolutions: resolutions,
-            tileSize: worldTileSize / dpiScale
-        });
-
-        var unminedLayer =
-            new Tile({
-                source: new XYZ({
-                    projection: viewProjection,
-                    tileGrid: tileGrid,
-                    tilePixelRatio: dpiScale,
-                    tileSize: worldTileSize / dpiScale,
-
-                    tileUrlFunction: function (coordinate) {
-                        const worldZoom = -(mapZoomLevels - coordinate[0]) + options.maxZoom;
-                        const worldZoomFactor = Math.pow(2, worldZoom);
-
-                        const minTileX = Math.floor(worldMinX * worldZoomFactor / worldTileSize);
-                        const minTileY = Math.floor(worldMinY * worldZoomFactor / worldTileSize);
-                        const maxTileX = Math.ceil((worldMinX + worldWidth) * worldZoomFactor / worldTileSize) - 1;
-                        const maxTileY = Math.ceil((worldMinY + worldHeight) * worldZoomFactor / worldTileSize) - 1;
-
-                        const tileX = coordinate[1];
-                        const tileY = coordinate[2];
-
-                        const tileBlockSize = worldTileSize / worldZoomFactor;
-                        const tileBlockPoint = {
-                            x: tileX * tileBlockSize,
-                            z: tileY * tileBlockSize
-                        };
-
-                        const hasTile = function () {
-                            const tileRegionPoint = {
-                                x: Math.floor(tileBlockPoint.x / 512),
-                                z: Math.floor(tileBlockPoint.z / 512)
-                            };
-                            const tileRegionSize = Math.ceil(tileBlockSize / 512);
-
-                            for (let x = tileRegionPoint.x; x < tileRegionPoint.x + tileRegionSize; x++) {
-                                for (let z = tileRegionPoint.z; z < tileRegionPoint.z + tileRegionSize; z++) {
-                                    const group = {
-                                        x: Math.floor(x / 32),
-                                        z: Math.floor(z / 32)
-                                    };
-                                    const regionMap = regions.find(e => e.x == group.x && e.z == group.z);
-                                    if (regionMap) {
-                                        const relX = x - group.x * 32;
-                                        const relZ = z - group.z * 32;
-                                        const inx = relZ * 32 + relX;
-                                        var b = regionMap.m[Math.floor(inx / 32)];
-                                        var bit = inx % 32;
-                                        var found = (b & (1 << bit)) != 0;
-                                        if (found) return true;
-                                    }
-                                }
-                            }
-                            return false;
-                        };
-
-                        if (tileX >= minTileX
-                            && tileY >= minTileY
-                            && tileX <= maxTileX
-                            && tileY <= maxTileY
-                            && hasTile()) {
-                            const z = worldZoom,
-                                yd = Math.floor(tileY / 10),
-                                xd = Math.floor(tileX / 10),
-                                y = tileY,
-                                x = tileX
-                            const url = `map/tiles/zoom.${z}/${xd}/${yd}/tile.${x}.${y}.${options.imageFormat}`
-                            return url;
-                        }
-                        else
-                            return undefined;
-                    }
-                })
-            });
-
-        var mousePositionControl = new MousePosition({
-            coordinateFormat: createStringXY(0),
-            projection: dataProjection
-        });
-
-        var map = new OlMap({
-            target: mapId,
-            controls: controlDefaults().extend([
-                mousePositionControl
-            ]),
-            layers: [
-                unminedLayer,
-                /*
-                new ol.layer.Tile({
-                    source: new ol.source.TileDebug({
-                        tileGrid: unminedTileGrid,
-                        projection: viewProjection
-                    })
-                })
-                */
-
-            ],
-            view: new View({
-                center: [0, 0],
-                extent: mapExtent,
-                projection: viewProjection,
-                resolutions: tileGrid.getResolutions(),
-                maxZoom: mapZoomLevels,
-                zoom: mapZoomLevels - options.maxZoom,
-                constrainResolution: true,
-                showFullExtent: true,
-                constrainOnlyCenter: true
-            })
-        });
-
-        if (options.markers) {
-            var markersLayer = this.createMarkersLayer(options.markers, dataProjection, viewProjection);
-            map.addLayer(markersLayer);
-        }
-
-        if (options.background) {
-            document.getElementById(mapId).style.backgroundColor = options.background;
-
-        }
-
-        this.openlayersMap = map;
-    }
-
-    createMarkersLayer(markers, dataProjection, viewProjection) {
-        var features = [];
-
-        for (var i = 0; i < markers.length; i++) {
-            var item = markers[i];
-            var longitude = item.x;
-            var latitude = item.z;
-
-            var feature = new Feature({
-                geometry: new Point(transform([longitude, latitude], dataProjection, viewProjection))
-            });
-
-            var style = new Style();
-            if (item.image)
-                style.setImage(new Icon({
-                    src: item.image,
-                    anchor: item.imageAnchor,
-                    scale: item.imageScale
-                }));
-
-            if (item.text)
-                style.setText(new Text({
-                    text: item.text,
-                    font: item.font,
-                    offsetX: item.offsetX,
-                    offsetY: item.offsetY,
-                    fill: new Fill({
-                        color: item.textColor
-                    })
-                }));
-
-            feature.setStyle(style);
-
-            features.push(feature);
-        }
-
-        var vectorSource = new SourceVector({
-            features: features
-        });
-
-        var vectorLayer = new LayerVector({
-            source: vectorSource
-        });
-        return vectorLayer;
-    }
-}
\ No newline at end of file
+/** (cursed) proxy variable to provide the fetched unmined script access to `ol.extent.boundingExtent` etc */
+export const ol_proxy = {
+    extent: {
+        boundingExtent: boundingExtent,
+    },
+    proj: {
+        Projection: Projection,
+        addCoordinateTransforms: addCoordinateTransforms,
+    },
+    tilegrid: {
+        TileGrid: TileGrid,
+    },
+    layer: {
+        Tile: Tile,
+        Vector: LayerVector,
+    },
+    source: {
+        XYZ: XYZ,
+        Vector: SourceVector,
+    },
+    control: {
+        MousePosition: MousePosition,
+        defaults: defaults,
+    },
+    coordinate: {
+        createStringXY: createStringXY,
+    },
+    View: View,
+    Map: Map,
+};
\ No newline at end of file
diff --git a/frontend/src/stores.ts b/frontend/src/stores.ts
index 1181e3f..2fdad13 100644
--- a/frontend/src/stores.ts
+++ b/frontend/src/stores.ts
@@ -1,4 +1,5 @@
 import { writable, type Writable } from "svelte/store";
+import type { Unmined } from "./pages/mining/unmined";
 
 type User = {
     name: string,
@@ -6,4 +7,5 @@ type User = {
     picture: string,
 }
 
-export const user: Writable<User | null> = writable(null);
\ No newline at end of file
+export const user: Writable<User | null> = writable(null);
+export const unmined: Writable<Unmined | null> = writable(null);
\ No newline at end of file
diff --git a/server/server/__init__.py b/server/server/__init__.py
index 047e917..b485732 100644
--- a/server/server/__init__.py
+++ b/server/server/__init__.py
@@ -4,13 +4,14 @@ from fastapi.responses import HTMLResponse
 
 from .settings import settings
 from .user import user_auth
-from .map_tiles import map_tiles
+from .map_tiles import map_tiles, map_meta
 from .templates import j2env
 
 app = FastAPI()
 
 app.mount("/user/", user_auth)
-app.mount("/map/", map_tiles)
+app.mount("/map/", map_meta)
+app.mount("/tiles/", map_tiles)
 
 frontend = FastAPI()
 
diff --git a/server/server/map_tiles.py b/server/server/map_tiles.py
index adb8345..2b3175c 100644
--- a/server/server/map_tiles.py
+++ b/server/server/map_tiles.py
@@ -4,17 +4,23 @@ from fastapi.staticfiles import StaticFiles
 from .settings import settings
 from .templates import j2env
 
-map_tiles = FastAPI()
+map_tiles = StaticFiles(directory=f"{settings.unmined_out_path}/tiles")
 
-map_tiles.mount("/tiles/", StaticFiles(directory=f"{settings.unmined_out_path}/tiles"))
+map_meta = FastAPI()
 
 
-class MetadataJsResponse(Response):
+class JsResponse(Response):
     media_type = "text/javascript"
 
 
 MAP_PROPS_FILE = f"{settings.unmined_out_path}/unmined.map.properties.js"
 MAP_REGIONS_FILE = f"{settings.unmined_out_path}/unmined.map.regions.js"
+UNMINED_FILE = f"{settings.unmined_out_path}/unmined.openlayers.js"
+
+with open(UNMINED_FILE, "r") as f:
+    unmined_script = j2env.get_template("unmined.js").render(
+        unmined_file=UNMINED_FILE, unmined_script=f.read()
+    )
 
 
 def parse_metadata():
@@ -31,7 +37,12 @@ def parse_metadata():
     )
 
 
-@map_tiles.get("/metadata.js", response_class=MetadataJsResponse)
+@map_meta.get("/unmined.js", response_class=JsResponse)
+async def get_unmined():
+    return unmined_script
+
+
+@map_meta.get("/metadata.js", response_class=JsResponse)
 async def get_metadata():
     # TODO cache
     return parse_metadata()
diff --git a/server/templates/metadata.js b/server/templates/metadata.js
index 619cafe..47d2961 100644
--- a/server/templates/metadata.js
+++ b/server/templates/metadata.js
@@ -1,8 +1,10 @@
-/* {{props_file}} */
-{{map_props}}
+/* {{ props_file }} */
+{{ map_props }}
+/* end of {{ props_file }} */
 
-/* {{regions_file}} */
+/* {{ regions_file }} */
 {{map_regions}}
+/* end of {{ regions_file }} */
 
 return {
     properties: UnminedMapProperties,
diff --git a/server/templates/unmined.js b/server/templates/unmined.js
new file mode 100644
index 0000000..612b67b
--- /dev/null
+++ b/server/templates/unmined.js
@@ -0,0 +1,5 @@
+/* {{ unmined_file }} */
+{{ unmined_script }}
+/* end of {{ unmined_file }} */
+
+return new Unmined();
\ No newline at end of file