Aligning with OSM usage policies

Added 24 hours cache on Nominatim requests
Added rate limiting on Nominatim requests
Added OpenStreetMap attribution on leaflet map

web/src/components/LeafletMap.tsx

@@ -34,6 +34,7 @@ const LocationMarker = (props: MarkerProps) => {
 
   useEffect(() => {
     map.attributionControl.setPrefix("");
+    map.attributionControl.addAttribution("<a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a>");
     map.locate();
   }, []);
 

web/src/components/MemoEditor/ActionButton/LocationSelector.tsx

@@ -1,6 +1,6 @@
 import { LatLng } from "leaflet";
 import { MapPinIcon, XIcon } from "lucide-react";
-import { useEffect, useState } from "react";
+import { useEffect, useState, useRef } from "react";
 import toast from "react-hot-toast";
 import LeafletMap from "@/components/LeafletMap";
 import { Button } from "@/components/ui/button";
@@ -21,6 +21,12 @@ interface State {
   position?: LatLng;
 }
 
+interface NomatimRateLimit {
+  lastNominatimFetch: Date;
+  nominatimTimeoutId: number | undefined;
+  timeBetweenFetch: number;
+}
+
 const LocationSelector = (props: Props) => {
   const t = useTranslate();
   const [state, setState] = useState<State>({
@@ -28,6 +34,12 @@ const LocationSelector = (props: Props) => {
     placeholder: props.location?.placeholder || "",
     position: props.location ? new LatLng(props.location.latitude, props.location.longitude) : undefined,
   });
+  const rateLimit = useRef<NomatimRateLimit>({
+    lastNominatimFetch: new Date(0),
+    nominatimTimeoutId: undefined,
+    timeBetweenFetch: 1300,
+  });
+
   const [popoverOpen, setPopoverOpen] = useState<boolean>(false);
 
   useEffect(() => {
@@ -63,14 +75,16 @@ const LocationSelector = (props: Props) => {
     }
   }, [popoverOpen]);
 
-  useEffect(() => {
+  const updateReverseGeocoding = () => {
     if (!state.position) {
       setState({ ...state, placeholder: "" });
       return;
     }
 
-    // Fetch reverse geocoding data.
-    fetch(`https://nominatim.openstreetmap.org/reverse?lat=${state.position.lat}&lon=${state.position.lng}&format=json`)
+    fetch(`https://nominatim.openstreetmap.org/reverse?lat=${state.position.lat}&lon=${state.position.lng}&format=json`, {
+      cache: "default",
+      headers: new Headers({ "Cache-Control": "max-age=86400" }),
+    })
       .then((response) => response.json())
       .then((data) => {
         if (data && data.display_name) {
@@ -81,6 +95,16 @@ const LocationSelector = (props: Props) => {
         toast.error("Failed to fetch reverse geocoding data");
         console.error("Failed to fetch reverse geocoding data:", error);
       });
+  }
+
+  useEffect(() => {
+    // Fetch reverse geocoding with rate limits
+    clearTimeout(rateLimit.current.nominatimTimeoutId);
+    const timeLeft = rateLimit.current.timeBetweenFetch - (new Date().getTime() - rateLimit.current.lastNominatimFetch.getTime());
+    rateLimit.current.nominatimTimeoutId = setTimeout(() => {
+      updateReverseGeocoding();
+      rateLimit.current.lastNominatimFetch = new Date();
+    }, timeLeft);
   }, [state.position]);
 
   const onPositionChanged = (position: LatLng) => {