refactor: load geojson defs from published schemas

formats/planning_configuration.py

@@ -184,20 +184,11 @@ platform_schema = {
 region_schema = {
     "type": "object",
     "properties": {
-        "geometry_coordinates": {
-            "type": "array",
-            "example": [
-                [
-                    [-4.1777839187560915, 50.34173405662855],
-                    [-4.1777839187560915, 50.33820949229701],
-                    [-4.143667777943875, 50.33820949229701],
-                    [-4.143667777943875, 50.34173405662855],
-                    [-4.1777839187560915, 50.34173405662855],
-                ]
-            ],
+        "geometry": {
+            "$ref": "https://geojson.org/schema/Polygon.json",
         },
     },
-    "description": "Using GEOJSON, exact 4-point region (rectangle shaped - 5 points)",
+    "description": "GeoJSON Polygon",
 }
 
 squad_metadata_schema = {

generate_schema_config.py

@@ -14,9 +14,11 @@ from formats.alert import alert_schema
 from flasgger import Swagger
 from flask import Flask
 
+import json
 import os
+import re
+import requests
 
-app = Flask(__name__)
 
 url_prefix = os.getenv("URL_PREFIX", "")
 
@@ -103,7 +105,98 @@ swagger_config = {
     },
 }
 
-swag = Swagger(app, config=swagger_config, merge=True)
+
+def resolve_ref(ref): 
+    """
+    Get schema URL, parse JSON 
+    Return None if either fails
+    """
+    try:
+        res = requests.get(ref)
+        if res.status_code == 200:
+            return res.json()
+        else: 
+            return None
+    except (json.JSONDecodeError, ValueError):
+        return None
+        
+
+def rename_ref(ref): 
+    """
+    Convert remote ref URL into a name that can 
+    be used for a local ref in the schema 
+    Remote the URL scheme and replace / with .
+    """
+    # remove url scheme
+    deschemed = re.sub(r"^[htps]*\:*[/]{2}", "", ref)
+    # replace / with . since the name will be in a path
+    return re.sub(r"[/]", ".", deschemed)
+
+
+def nested_replace(source, key, value, replace_with):
+    """
+    Find all instances of a key value pair in a nested 
+    dictionary and replace the value with replace_with
+    """ 
+    for k,v in source.items():
+        if k == key and v == value:
+            source[k] = replace_with
+        elif type(v) is list:
+            for item in v:
+                if type(item) is dict:
+                    nested_replace(item, key, value, replace_with)
+        if type(v) is dict:
+            nested_replace(v, key, value, replace_with)
+
+
+def inject_schema(schema, remote_ref):
+    """
+    Given a parent schema and a remote ref
+    
+    1. get the remote ref schema
+    2. create a local reference name (without path separators)
+    3. insert into components.schemas 
+    4. replace remote references with local references 
+
+    
+    returns True if resolved and injected
+    """ 
+    local_name = rename_ref(remote_ref)
+    local_ref = f"#/components/schemas/{local_name}"
+    ref_schema = resolve_ref(remote_ref)
+    if (ref_schema is not None):
+        nested_replace(schema, "$ref", remote_ref, local_ref)
+        schema["components"]["schemas"][local_name] = ref_schema
+        return True
+    else: 
+        return False    
+
+
+def import_remote_refs():
+    """
+    inject the following remote refs into the schema 
+    and replace the remote refs with local refs
+
+    returns True if all schemas resolved and injected 
+    """
+    ref_imports = [
+        "https://geojson.org/schema/Feature.json",
+        "https://geojson.org/schema/FeatureCollection.json",
+        "https://geojson.org/schema/LineString.json",
+        "https://geojson.org/schema/Point.json",
+        "https://geojson.org/schema/Polygon.json",
+    ]
+
+    return all([
+        inject_schema(swagger_config, ref)
+        for ref in ref_imports
+    ])
+
+
+import_remote_refs()
+
+app = Flask(__name__)
+Swagger(app, config=swagger_config, merge=True)
 
 flask_host = os.getenv(
     "FLASK_HOST", "localhost"

requirements.txt

 Flask
 flask-restx
 flasgger
+requests