Utils - `create_osm_town` create town from OSM relation

3 files changed, 74 insertions, 3 deletions

diff --git a/CHANGES.md b/CHANGES.md
index 2e0e814da..a9a1f52b1 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,11 +1,18 @@
 ---
 title: Ishtar changelog
-date: 2022-07-10
+date: 2022-09-18
 ---
 
 Ishtar changelog
 ================
 
+v3.2.5 - 2022-09-18
+--------------------
+
+### Features ###
+
+- utils - `create_osm_town` create town from OSM relation
+
 v3.2.4 - 2022-09-18
 --------------------
 
diff --git a/ishtar_common/utils.py b/ishtar_common/utils.py
index bfb5d0e32..137f89469 100644
--- a/ishtar_common/utils.py
+++ b/ishtar_common/utils.py
@@ -2162,3 +2162,67 @@ def generate_pdf_preview(item, save=True, tempdir=None, page_number=None):
         django_file = File(preview)
         getattr(item, "image").save("page.jpg", django_file, save=True)
     shutil.rmtree(tempdir)
+
+
+def get_create_merge_town(insee, default):
+    from ishtar_common.model_merging import merge_model_objects
+    Town = apps.get_model("ishtar_common", "Town")
+    q = Town.objects.filter(numero_insee=insee)
+    if q.count() > 1:
+        town = None
+        for t in q.all():
+            if not town:
+                town = t
+            else:
+                merge_model_objects(town, t)
+    else:
+        town, __ = Town.objects.get_or_create(
+            numero_insee=insee, defaults=default
+        )
+    return town
+
+
+OSM_URL = "http://polygons.openstreetmap.fr/get_geojson.py?id={}"
+OSM_REFRESH_URL = "http://polygons.openstreetmap.fr/?id={}"
+OSM_SIMPLIFY = "&params=0.000800-0.000200-0.000200"
+
+
+def create_osm_town(rel_id, name, numero_insee=None):
+    """
+    Create town from OSM relation
+
+    :param rel_id: OSM relation IS
+    :param name: "town" name
+    :param numero_insee: town reference by default OSM[rel_id]
+    :return: town
+    """
+    geojson, retry = None, 0
+    while not geojson and retry < 5:
+        response = requests.get(OSM_URL.format(rel_id))
+        retry += 1
+        try:
+            geojson = response.json()
+        except:
+            requests.get(OSM_REFRESH_URL.format(rel_id))
+            time.sleep(3)
+    if not geojson:
+        print("\nError on: " + OSM_URL.format(rel_id))
+        return
+    if len(geojson) > 50000:
+        response = requests.get(OSM_URL.format(rel_id) + OSM_SIMPLIFY)
+        try:
+            geojson_simplify = response.json()
+            geojson = geojson_simplify
+        except:
+            pass
+    default = {"name": name}
+    if not numero_insee:
+        numero_insee = f"OSM{rel_id}"
+    town = get_create_merge_town(numero_insee, default)
+    geom = GEOSGeometry(str(geojson))
+    if geom.geom_type == "GeometryCollection":
+        geom = geom[0]
+    town.limit = geom
+    town.center = town.limit.centroid
+    town.save()
+    return town
diff --git a/ishtar_common/version.py b/ishtar_common/version.py
index 59dda6a51..adde2c7e9 100644
--- a/ishtar_common/version.py
+++ b/ishtar_common/version.py
@@ -1,5 +1,5 @@
-# 3.2.4
-VERSION = (3, 2, 4)
+# 3.2.5
+VERSION = (3, 2, 5)
 
 
 def get_version():