API - support tile server w/ subdomains for static map generation

.env.example

@@ -25,6 +25,7 @@ export SENDER_EMAIL=
 
 # Workouts
 # export TILE_SERVER_URL=
+# export STATICMAP_SUBDOMAINS=
 # export MAP_ATTRIBUTION=
 # export DEFAULT_STATICMAP=False
 # export WEATHER_API_KEY=

fittrackee/config.py

@@ -45,6 +45,7 @@ class BaseConfig:
         'DEFAULT_STATICMAP': (
             os.environ.get('DEFAULT_STATICMAP', 'false').lower() == 'true'
         ),
+        'STATICMAP_SUBDOMAINS': os.environ.get('STATICMAP_SUBDOMAINS', ''),
     }
     TRANSLATIONS_FOLDER = os.path.join(
         current_app.root_path, 'emails/translations'

fittrackee/tests/fixtures/fixtures_app.py

@@ -81,6 +81,8 @@ def app(monkeypatch: pytest.MonkeyPatch) -> Generator:
     monkeypatch.setenv('WEATHER_API_KEY', '')
     if os.getenv('TILE_SERVER_URL'):
         monkeypatch.delenv('TILE_SERVER_URL')
+    if os.getenv('STATICMAP_SUBDOMAINS'):
+        monkeypatch.delenv('STATICMAP_SUBDOMAINS')
     if os.getenv('MAP_ATTRIBUTION'):
         monkeypatch.delenv('MAP_ATTRIBUTION')
     if os.getenv('DEFAULT_STATICMAP'):

fittrackee/tests/workouts/test_utils/test_maps.py

@@ -0,0 +1,63 @@
+from unittest.mock import patch
+
+import pytest
+
+from fittrackee.workouts.utils.maps import get_static_map_tile_server_url
+
+
+class TestGetStaticMapTileServerUrl:
+    @pytest.mark.parametrize(
+        'input_tile_server_url,input_tile_server_subdomains,'
+        'expected_tile_server_url',
+        [
+            (
+                'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+                None,
+                'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            ),
+            (
+                'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+                'a',
+                'https://a.tile.openstreetmap.org/{z}/{x}/{y}.png',
+            ),
+            (
+                'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+                None,
+                'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            ),
+            (
+                'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+                'a',
+                'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
+            ),
+        ],
+    )
+    def test_it_returns_tile_server_url(
+        self,
+        input_tile_server_url: str,
+        input_tile_server_subdomains: str,
+        expected_tile_server_url: str,
+    ) -> None:
+        tile_config = {
+            'URL': input_tile_server_url,
+            'STATICMAP_SUBDOMAINS': input_tile_server_subdomains,
+        }
+
+        assert (
+            get_static_map_tile_server_url(tile_config)
+            == expected_tile_server_url
+        )
+
+    def test_it_returns_tile_server_url_with_random_submain_when_multiple_provided(  # noqa
+        self,
+    ) -> None:
+        tile_config = {
+            'URL': 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+            'STATICMAP_SUBDOMAINS': 'a,b,c',
+        }
+
+        with patch('random.choice', return_value='b'):
+            assert (
+                get_static_map_tile_server_url(tile_config)
+                == 'https://b.tile.openstreetmap.org/{z}/{x}/{y}.png'
+            )

fittrackee/workouts/utils/maps.py

@@ -1,5 +1,6 @@
 import hashlib
-from typing import List
+import random
+from typing import Dict, List
 
 from flask import current_app
 from staticmap import Line, StaticMap
@@ -8,6 +9,15 @@ from fittrackee import VERSION
 from fittrackee.files import get_absolute_file_path
 
 
+def get_static_map_tile_server_url(tile_server_config: Dict) -> str:
+    if tile_server_config['STATICMAP_SUBDOMAINS']:
+        subdomains = tile_server_config['STATICMAP_SUBDOMAINS'].split(',')
+        subdomain = f'{random.choice(subdomains)}.'  # nosec
+    else:
+        subdomain = ''
+    return tile_server_config['URL'].replace('{s}.', subdomain)
+
+
 def generate_map(map_filepath: str, map_data: List) -> None:
     """
     Generate and save map image from map data
@@ -15,8 +25,8 @@ def generate_map(map_filepath: str, map_data: List) -> None:
     m = StaticMap(400, 225, 10)
     m.headers = {'User-Agent': f'FitTrackee v{VERSION}'}
     if not current_app.config['TILE_SERVER']['DEFAULT_STATICMAP']:
-        m.url_template = current_app.config['TILE_SERVER']['URL'].replace(
+        m.url_template = get_static_map_tile_server_url(
-            '{s}.', ''
+            current_app.config['TILE_SERVER']
         )
     line = Line(map_data, '#3388FF', 4)
     m.add_line(line)