Allow the specification to be specified as a URL.

connexion/middleware/main.py

@@ -408,7 +408,11 @@ def add_api(
         if self.middleware_stack is not None:
             raise RuntimeError("Cannot add api after an application has started")
 
-        if isinstance(specification, (pathlib.Path, str)):
+        if isinstance(specification, str) and (
+            specification.startswith("http://") or specification.startswith("https://")
+        ):
+            pass
+        elif isinstance(specification, (pathlib.Path, str)):
             specification = t.cast(pathlib.Path, self.specification_dir / specification)
 
             # Add specification as file to watch for reloading

connexion/spec.py

@@ -8,12 +8,14 @@
 import os
 import pathlib
 import pkgutil
+import tempfile
 import typing as t
 from collections.abc import Mapping
 from urllib.parse import urlsplit
 
 import jinja2
 import jsonschema
+import requests
 import yaml
 from jsonschema import Draft4Validator
 from jsonschema.validators import extend as extend_validator
@@ -158,6 +160,17 @@ def from_file(cls, spec, *, arguments=None, base_uri=""):
         spec = cls._load_spec_from_file(arguments, specification_path)
         return cls.from_dict(spec, base_uri=base_uri)
 
+    @classmethod
+    def from_url(cls, spec, *, arguments=None, base_uri=""):
+        """
+        Takes in a path to a YAML file, and returns a Specification
+        """
+        spec_content = requests.get(spec).content
+        with tempfile.NamedTemporaryFile() as tfile:
+            tfile.write(spec_content)
+            tfile.flush()
+            return cls.from_file(tfile.name, arguments=arguments, base_uri=base_uri)
+
     @staticmethod
     def _get_spec_version(spec):
         try:
@@ -200,6 +213,10 @@ def clone(self):
 
     @classmethod
     def load(cls, spec, *, arguments=None):
+        if isinstance(spec, str) and (
+            spec.startswith("http://") or spec.startswith("https://")
+        ):
+            return cls.from_url(spec, arguments=arguments)
         if not isinstance(spec, dict):
             base_uri = f"{pathlib.Path(spec).parent}{os.sep}"
             return cls.from_file(spec, arguments=arguments, base_uri=base_uri)

tests/test_api.py

@@ -51,6 +51,42 @@ def test_api_base_path_slash():
     assert api.blueprint.url_prefix == ""
 
 
+def test_remote_api():
+    api = FlaskApi(
+        Specification.load(
+            "https://raw.githubusercontent.com/spec-first/connexion/165a915/tests/fixtures/simple/swagger.yaml"
+        ),
+        base_path="/api/v1.0",
+    )
+    assert api.blueprint.name == "/api/v1_0"
+    assert api.blueprint.url_prefix == "/api/v1.0"
+
+    api2 = FlaskApi(
+        Specification.load(
+            "https://raw.githubusercontent.com/spec-first/connexion/165a915/tests/fixtures/simple/swagger.yaml"
+        )
+    )
+    assert api2.blueprint.name == "/v1_0"
+    assert api2.blueprint.url_prefix == "/v1.0"
+
+    api3 = FlaskApi(
+        Specification.load(
+            "https://raw.githubusercontent.com/spec-first/connexion/165a915/tests/fixtures/simple/openapi.yaml"
+        ),
+        base_path="/api/v1.0",
+    )
+    assert api3.blueprint.name == "/api/v1_0"
+    assert api3.blueprint.url_prefix == "/api/v1.0"
+
+    api4 = FlaskApi(
+        Specification.load(
+            "https://raw.githubusercontent.com/spec-first/connexion/165a915/tests/fixtures/simple/openapi.yaml"
+        )
+    )
+    assert api4.blueprint.name == "/v1_0"
+    assert api4.blueprint.url_prefix == "/v1.0"
+
+
 def test_template():
     api1 = FlaskApi(
         Specification.load(