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| import ast | |
| import json | |
| import streamlit as st | |
| import leafmap.foliumap as leafmap | |
| st.set_page_config(layout="wide") | |
| st.sidebar.info( | |
| """ | |
| - Web App URL: <https://streamlit.gishub.org> | |
| - GitHub repository: <https://github.com/giswqs/streamlit-geospatial> | |
| """ | |
| ) | |
| st.sidebar.title("Contact") | |
| st.sidebar.info( | |
| """ | |
| Qiusheng Wu at [wetlands.io](https://wetlands.io) | [GitHub](https://github.com/giswqs) | [Twitter](https://twitter.com/giswqs) | [YouTube](https://www.youtube.com/@giswqs) | [LinkedIn](https://www.linkedin.com/in/giswqs) | |
| """ | |
| ) | |
| # Define a whitelist of trusted URLs | |
| trusted_urls = [ | |
| "https://services.terrascope.be/wms/v2", | |
| # Add more trusted URLs here | |
| ] | |
| def get_layers(url): | |
| options = leafmap.get_wms_layers(url) | |
| return options | |
| def is_trusted_url(url): | |
| return url in trusted_urls | |
| def app(): | |
| st.title("Web Map Service (WMS)") | |
| st.markdown( | |
| """ | |
| This app is a demonstration of loading Web Map Service (WMS) layers. Simply enter the URL of the WMS service | |
| in the text box below and press Enter to retrieve the layers. Go to https://apps.nationalmap.gov/services to find | |
| some WMS URLs if needed. | |
| """ | |
| ) | |
| row1_col1, row1_col2 = st.columns([3, 1.3]) | |
| width = 800 | |
| height = 600 | |
| layers = None | |
| with row1_col2: | |
| esa_landcover = "https://services.terrascope.be/wms/v2" | |
| url = st.text_input( | |
| "Enter a WMS URL:", value="https://services.terrascope.be/wms/v2" | |
| ) | |
| empty = st.empty() | |
| if url: | |
| if is_trusted_url(url): | |
| options = get_layers(url) | |
| # Process options as needed | |
| else: | |
| st.error( | |
| "The entered URL is not trusted. Please enter a valid WMS URL." | |
| ) | |
| default = None | |
| if url == esa_landcover: | |
| default = "WORLDCOVER_2020_MAP" | |
| layers = empty.multiselect( | |
| "Select WMS layers to add to the map:", options, default=default | |
| ) | |
| add_legend = st.checkbox("Add a legend to the map", value=True) | |
| if default == "WORLDCOVER_2020_MAP": | |
| legend = str(leafmap.builtin_legends["ESA_WorldCover"]) | |
| else: | |
| legend = "" | |
| if add_legend: | |
| legend_text = st.text_area( | |
| "Enter a legend as a dictionary {label: color}", | |
| value=legend, | |
| height=200, | |
| ) | |
| with row1_col1: | |
| m = leafmap.Map(center=(36.3, 0), zoom=2) | |
| if layers is not None: | |
| for layer in layers: | |
| m.add_wms_layer( | |
| url, layers=layer, name=layer, attribution=" ", transparent=True | |
| ) | |
| if add_legend and legend_text: | |
| legend_dict = json.loads(legend_text.replace("'", '"')) | |
| m.add_legend(legend_dict=legend_dict) | |
| m.to_streamlit(height=height) | |
| app() | |