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kmpoppe / Additional Links for the openstreetmap.org-sidebar

// ==UserScript==
// @name        Additional Links for the openstreetmap.org-sidebar
// @description This script source is outdated and installation should move to jsDeliver from GitHub.
// @version     12
// @grant       none
// @copyright   2021, https://github.com/joshinils and https://github.com/kmpoppe
// @updateURL   https://cdn.jsdelivr.net/gh/OSM-de/osm-org-greasemonkey@master/osm-org-greasemonkey.user.js
// @installURL  https://cdn.jsdelivr.net/gh/OSM-de/osm-org-greasemonkey@master/osm-org-greasemonkey.user.js
// @downloadURL https://cdn.jsdelivr.net/gh/OSM-de/osm-org-greasemonkey@master/osm-org-greasemonkey.user.js
// @license     MIT
// @icon        https://www.openstreetmap.org/assets/favicon-16x16-474476c1b2381628a81361a9e2bf04b936d21f77c59e84b48c6c69ea376fb6cf.png
// @match https://www.openstreetmap.org/*
// ==/UserScript==

// Mutation observer for URI (Source: https://stackoverflow.com/a/46428962)
var oldHref = document.location.href;
window.onload = function() {
  var config = {
    childList: true,
    subtree: true
  };
  var bodyList = document.querySelector("body");
  var observer = new MutationObserver(function(mutations) {
      mutations.forEach(function(mutation) {
        if (oldHref !== document.location.href) {
          oldHref = document.location.href;
          modifyContent();
        }
      });
    });
  observer.observe(bodyList, config);
};

modifyContent();

function modifyContent() {
  // new DOM objects
  var displayContainer;
  // native DOM objects
  var sidebar_content;
  var navbar_content;
  // other variables
  var thisUrl;
  var loc;
  var objectMatches;
  var mapMatches;
  var iZoom;
  var OsmObject = { id: "", type: "" };
  var OsmMap = { lat: "", lon: "", zoom : "" };

  // get native DOM objects
  sidebar_content = document.getElementById("sidebar_content").getElementsByClassName("browse-section")[0];
  navbar_content = document.getElementsByClassName("primary")[0].getElementsByClassName("btn-group")[0];

  // parse the current URI into RegEx matches
  loc = window.location.toString();
  objectMatches = loc.match(/(changeset|node|way|relation)\/(\d+)/);
  if (objectMatches) {
    OsmObject = {
      id: objectMatches[2],
      type: objectMatches[1]
    };
  }
  mapMatches = loc.match(/#map=(\d+)\/([\-|\d|.]*)\/([\-|\d|.]*)/);
  if (mapMatches) {
    iZoom = parseInt(mapMatches[1]) - 1;
    OsmMap = {
      lat: mapMatches[2],
      lon: mapMatches[3],
      zoom: iZoom.toString()
    };
  }

  // Add links to the sidebar (node, way, relation, changeset)
  if (sidebar_content) {
    displayContainer = document.createElement("div");
    displayContainer.id = "GM-CONTA";
    displayContainer.className = "browse-tag-list";

    // Changesets ONLY
    if (OsmObject.type === "changeset") {
      thisUrl = "https://osmcha.org/changesets/" + OsmObject.id;
      createOrUpdate("GM-OMSCH", displayContainer, thisUrl, "OSMCha for this Changeset");
    }
    // Nodes, Ways, Relations ONLY
    if (new RegExp(["node","way","relation"].join("|")).test(OsmObject.type)) {
      // OSM Deep History
      thisUrl = "https://osmlab.github.io/osm-deep-history/#/" + OsmObject.type + "/" + OsmObject.id;
      createOrUpdate("GM-OMSDH", displayContainer, thisUrl, "OSM Deep History");
      thisUrl = "https://nominatim.openstreetmap.org/ui/details.html?osmtype=" + OsmObject.type.substring(0, 1).toUpperCase() + "&osmid=" + OsmObject.id;
      // Nominatim Details
      createOrUpdate("GM-NOMIN", displayContainer, thisUrl, "Nominatim Details");
    }
    if (!document.getElementById("GM-CONTA")) {
      sidebar_content.parentNode.insertBefore(displayContainer, sidebar_content);
    }
  }

  // Add links to the primary navigation bar
  if (navbar_content) {
    if (loc.includes("#map=")) {
      // Mapillary
      thisUrl = "https://www.mapillary.com/app/?lat=" + OsmMap.lat + "&lng=" + OsmMap.lon + "&z=" + OsmMap.zoom;
      createOrUpdate("GM-MAPIL", navbar_content, thisUrl, "Mapillary", "btn btn-outline-primary");
      // KartaView
      thisUrl = "https://kartaview.org/map/@" + OsmMap.lat + "," + OsmMap.lon + "," + OsmMap.zoom + "z";
      createOrUpdate("GM-KARTA", navbar_content, thisUrl, "KartaView", "btn btn-outline-primary");
    }
  }
}

function createOrUpdate(id, targetObject, thisUrl, text, className = "") {
  var existingAnchor = document.getElementById(id);
  if (existingAnchor) {
    existingAnchor.href = thisUrl;
  } else {
    targetObject.appendChild(
      getAnchorElement(
        id,
        thisUrl,
        text,
        className
      )
    );
  }
}

function getAnchorElement(id, url, text, className = "", target = "_blank") {
  var anchor;
  anchor = document.createElement("a");
  anchor.id = id;
  anchor.target = target;
  anchor.href = url;
  anchor.innerHTML = "<center>" + text + "</center>";
  if (className !== "") {
    anchor.className = className;
  }
  return anchor;
}