wehub-resource-sync
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165 lines
4.7 KiB
Python
165 lines
4.7 KiB
Python
"""Interactive Map — geocode addresses and render on an interactive map.
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Accepts plain addresses (or place names), geocodes them via
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OpenStreetMap Nominatim, and renders an interactive Leaflet map.
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Usage:
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fastmcp dev apps map_server.py
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"""
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from __future__ import annotations
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from textwrap import dedent
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import httpx
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from prefab_ui.app import PrefabApp
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from prefab_ui.components import (
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Badge,
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Card,
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Column,
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Embed,
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Heading,
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Muted,
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)
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from prefab_ui.components.data_table import DataTable, DataTableColumn
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from fastmcp import FastMCP
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mcp = FastMCP("Interactive Map")
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NOMINATIM_URL = "https://nominatim.openstreetmap.org/search"
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def _geocode(query: str) -> dict | None:
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"""Geocode an address using OpenStreetMap Nominatim (free, no key)."""
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resp = httpx.get(
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NOMINATIM_URL,
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params={"q": query, "format": "json", "limit": 1},
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headers={"User-Agent": "fastmcp-map-example/1.0"},
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timeout=10,
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)
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results = resp.json()
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if results:
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r = results[0]
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return {
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"name": r.get("display_name", query).split(",")[0],
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"address": query,
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"lat": float(r["lat"]),
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"lng": float(r["lon"]),
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}
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return None
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def _build_map_html(
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locations: list[dict],
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zoom: int,
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) -> str:
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markers_js = ""
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for loc in locations:
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name = str(loc["name"]).replace("\\", "\\\\").replace("'", "\\'")
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markers_js += (
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f"L.marker([{loc['lat']}, {loc['lng']}]).addTo(map).bindPopup('{name}');\n"
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)
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avg_lat = sum(loc["lat"] for loc in locations) / len(locations)
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avg_lng = sum(loc["lng"] for loc in locations) / len(locations)
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return dedent(f"""\
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<link
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rel="stylesheet"
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href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
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/>
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<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
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<style>
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body {{ margin: 0; }}
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#map {{ width: 100%; height: 100vh; }}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<script>
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var map = L.map('map').setView([{avg_lat}, {avg_lng}], {zoom});
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L.tileLayer('https://{{s}}.tile.openstreetmap.org/{{z}}/{{x}}/{{y}}.png', {{
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attribution: '© OpenStreetMap contributors'
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}}).addTo(map);
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{markers_js}
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</script>
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</body>
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</html>
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""")
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@mcp.tool(app=True)
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def show_map(
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locations: list[str] | None = None,
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title: str = "Map",
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zoom: int = 2,
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) -> PrefabApp:
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"""Show locations on an interactive map.
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Accepts addresses, place names, or landmarks. Each location is
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geocoded via OpenStreetMap and displayed as a marker on an
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interactive Leaflet map.
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Args:
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locations: List of addresses or place names. Defaults to
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sample US landmarks if not provided.
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title: Heading for the map.
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zoom: Initial zoom level (1-18, higher = closer).
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"""
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if not locations:
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locations = [
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"Statue of Liberty, New York",
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"Golden Gate Bridge, San Francisco",
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"Space Needle, Seattle",
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"Willis Tower, Chicago",
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"Gateway Arch, St. Louis",
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]
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geocoded = []
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failed = []
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for loc in locations:
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result = _geocode(loc)
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if result:
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geocoded.append(result)
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else:
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failed.append(loc)
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with PrefabApp() as app:
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with Column(gap=4, css_class="p-6"):
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Heading(title)
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Muted(f"{len(geocoded)} locations mapped")
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if failed:
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for f in failed:
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Badge(f"Could not find: {f}", variant="destructive")
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if geocoded:
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map_html = _build_map_html(geocoded, zoom)
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with Card():
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Embed(
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html=map_html,
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width="100%",
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height="500px",
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sandbox="allow-scripts",
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)
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DataTable(
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columns=[
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DataTableColumn(key="name", header="Name", sortable=True),
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DataTableColumn(key="address", header="Address", sortable=True),
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DataTableColumn(key="lat", header="Latitude", sortable=True),
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DataTableColumn(key="lng", header="Longitude", sortable=True),
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],
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rows=geocoded,
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search=True,
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)
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return app
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if __name__ == "__main__":
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mcp.run()
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