Added NOTAM module. Fixes #22

README.md

@@ -47,6 +47,13 @@ Aviation weather TAF service access.
 
 * !taf eftp
 
+### NOTAM
+
+Aviation NOTAM data access. Currently supports only Finnish airports - implement other countries where
+data is available.
+
+* !notam efjm
+
 ### Teamup
 
 Can access Teamup ( https://teamup.com/ ) calendar. Teamup has nice API and is easier to set up than Google so

modules/notam.py

@@ -0,0 +1,45 @@
+import urllib.request
+import re
+
+
+class MatrixModule:
+    async def matrix_message(self, bot, room, event):
+        args = event.body.split()
+        if len(args) == 2 and len(args[1]) == 4:
+            icao = args[1].upper()
+            notam = self.get_notam(icao)
+            await bot.send_text(room, notam)
+        else:
+            await bot.send_text(room, 'Usage: !notam <icao code>')
+
+    def help(self):
+        return('NOTAM data access (usage: !notam <icao code>) - Currently Finnish airports only')
+
+# TODO: This handles only finnish airports. Implement support for other countries.
+    def get_notam(self, icao):
+        if not icao.startswith('EF'):
+            return('Only Finnish airports supported currently, sorry.')
+
+        icao_first_letter = icao[2]
+        if icao_first_letter < 'M':
+            notam_url = "https://www.ais.fi/ais/bulletins/envfra.htm"
+        else:
+            notam_url = "https://www.ais.fi/ais/bulletins/envfrm.htm"
+
+        response = urllib.request.urlopen(notam_url)
+        lines = response.readlines()
+        lines = b''.join(lines)
+        lines = lines.decode("ISO-8859-1")
+        # Strip EN-ROUTE from end
+        lines = lines[0:lines.find('<a name="EN-ROUTE">')]
+
+        startpos = lines.find('<a name="' + icao + '">')
+        if startpos > -1:
+            endpos = lines.find('<h3>', startpos)
+            if endpos == -1:
+                endpos = len(lines)
+            notam = lines[startpos:endpos]
+            notam = re.sub('<[^<]+?>', ' ', notam)
+            if len(notam) > 4:
+                return notam
+        return f'Cannot parse notam for {icao} at {notam_url}'