Add wikipedia box

Logic/Web/Wikidata.ts

@@ -0,0 +1,89 @@
+import {Utils} from "../../Utils";
+
+
+export interface WikidataResponse {
+
+    id: string,
+    labels: Map<string, string>,
+    descriptions: Map<string, string>,
+    claims: Map<string, Set<string>>,
+    wikisites: Map<string, string>
+    commons: string
+}
+
+/**
+ * Utility functions around wikidata
+ */
+export default class Wikidata {
+
+    private static ParseResponse(entity: any): WikidataResponse {
+        const labels = new Map<string, string>()
+        for (const labelName in entity.labels) {
+            // The labelname is the language code
+            labels.set(labelName, entity.labels[labelName].value)
+        }
+
+        const descr = new Map<string, string>()
+        for (const labelName in entity.descriptions) {
+            // The labelname is the language code
+            descr.set(labelName, entity.descriptions[labelName].value)
+        }
+
+        const sitelinks = new Map<string, string>();
+        for (const labelName in entity.sitelinks) {
+            // labelName is `${language}wiki`
+            const language = labelName.substring(0, labelName.length - 4)
+            const title = entity.sitelinks[labelName].title
+            sitelinks.set(language, title)
+        }
+        
+        const commons = sitelinks.get("commons")
+        sitelinks.delete("commons")
+
+        const claims = new Map<string, Set<string>>();
+        for (const claimId of entity.claims) {
+
+            const claimsList: any[] = entity.claims[claimId]
+            const values = new Set<string>()
+            for (const claim of claimsList) {
+                const value = claim.mainsnak.datavalue.value;
+                values.add(value)
+            }
+            claims.set(claimId, values);
+        }
+
+        return {
+            claims: claims,
+            descriptions: descr,
+            id: entity.id,
+            labels: labels,
+            wikisites: sitelinks,
+            commons: commons
+        }
+    }
+
+    /**
+     * Loads a wikidata page
+     * @returns the entity of the given value
+     */
+    public static async LoadWikidataEntry(value: string | number): Promise<WikidataResponse> {
+        const wikidataUrl = "https://www.wikidata.org/wiki/"
+        if (typeof value === "number") {
+            value = "Q" + value
+        }
+        if (value.startsWith(wikidataUrl)) {
+            value = value.substring(wikidataUrl.length)
+        }
+        if (value.startsWith("http")) {
+            // Probably some random link in the image field - we skip it
+            return undefined
+        }
+        if (!value.startsWith("Q")) {
+            value = "Q" + value
+        }
+        const url = "https://www.wikidata.org/wiki/Special:EntityData/" + value + ".json";
+        const response = await Utils.downloadJson(url)
+        return Wikidata.ParseResponse(response.entities[value]);
+    }
+
+}