feat: Add a SPARQL query to retrieve images from Wikimedia commons

controllers/wikidata.js

@@ -0,0 +1,28 @@
+// Query wikidata with axios
+const axios = require("axios");
+
+function query(sparqlQuery) {
+    const endpoint = 'https://query.wikidata.org/sparql';
+    const fullUrl = endpoint + '?query=' + encodeURIComponent( sparqlQuery );
+    const headers = { 'Accept': 'application/sparql-results+json' };
+    return axios.get(fullUrl, { headers }).then( body => body.data );
+}
+
+function encodeSparqlQuery(species) {
+    let sparqlTemplate = `#defaultView:ImageGrid
+    SELECT ?item ?itemLabel ?pic
+    WHERE
+    {
+    ?item wdt:P225 "${species}" .
+    ?item wdt:P18 ?pic
+    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
+    }`
+    return sparqlTemplate;
+}
+
+
+function getPictures(species) {
+    return query(encodeSparqlQuery(species));
+} 
+
+getPictures("Picus viridis").then((data) => console.log(data.results.bindings));