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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
]
@st.cache_data
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()
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