diff --git a/sample.config.py b/sample.config.py
index 77cf5cf..ee504b0 100644
--- a/sample.config.py
+++ b/sample.config.py
@@ -3,3 +3,7 @@ mapbox_key = "pk.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
 
 # Access token for Dark Sky
 dark_sky_key = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+
+# Source line. Will be attached to the end of every message
+# This line is necessary for complying with AGPL.
+source = "Source: https://gitlab.com/ceda_ei/sky\n"
diff --git a/schema.sql b/schema.sql
new file mode 100644
index 0000000..bee50fd
--- /dev/null
+++ b/schema.sql
@@ -0,0 +1 @@
+CREATE TABLE IF NOT EXISTS location(name varchar(255) PRIMARY KEY, lat real, lon real);
diff --git a/server.py b/server.py
index fbe3a8b..674f60d 100644
--- a/server.py
+++ b/server.py
@@ -10,16 +10,40 @@ app = Flask(__name__)
 cache_db = sqlite3.connect("cache.sqlite")
 
 
+def get_coordinates(location, geocoder, cache_db):
+    row = cache_db.execute("select lat,lon from location where name = ?;",
+                           (location,)).fetchone()
+
+    if row is not None:
+        return (row[0], row[1])
+
+    loc = geocoder.forward(location)
+    coordinates = loc.geojson()['features'][0]['center']
+    cache_db.execute("insert into location(name, lat, lon) values(?,?,?)",
+                     (location, *coordinates))
+    return tuple(coordinates)
+
+
+def get_weather(coordinates):
+    return coordinates
+
+
+def weather_to_text(text):
+    return str(text)
+
+
 @app.route('/')
 def index():
     text = ("To get the weather for a location, run curl "
-            "https://sky.webionite.com/location. \n"
-            "Source: https://gitlab.com/ceda_ei/sky\n")
+            "https://sky.webionite.com/location. \n" + config.source)
     return text
 
 
 def main(location, geocoder, cache_db):
-    return
+    coordinates = get_coordinates(location, geocoder, cache_db)
+    weather = get_weather(coordinates)
+    text = weather_to_text(weather)
+    return text + "\n" + config.source
 
 
 app.add_url_rule('/<location>', 'location', lambda location: