package/python-flask-expects-json: new package

This commit adds a new package called python-flask-expects-json, which
also to validate the JSON blurbs submitted to a Flask web
application. A runtime test is added as well, making sure that the
package minimally works with an example Flask application.

The files added by this commit are associated both to Nicolas Carrier
and myself in the DEVELOPERS file, as Nicolas is also interested in
this package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

DEVELOPERS

@@ -1982,10 +1982,13 @@ N:	Nicolas Carrier <nicolas.carrier@orolia.com>
 F:	package/bmap-tools/
 F:	package/php-xdebug/
 F:	package/python-augeas/
+F:	package/python-flask-expects-json/
 F:	support/testing/tests/package/sample_bmap_tools.sh
 F:	support/testing/tests/package/sample_python_augeas.py
+F:	support/testing/tests/package/sample_python_flask_expects_json.py
 F:	support/testing/tests/package/test_bmap_tools.py
 F:	support/testing/tests/package/test_python_augeas.py
+F:	support/testing/tests/package/test_python_flask_expects_json.py
 
 N:	Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
 F:	package/libgit2/
@@ -2682,6 +2685,7 @@ F:	package/pkg-generic.mk
 F:	package/python/
 F:	package/python3/
 F:	package/python-augeas/
+F:	package/python-flask-expects-json/
 F:	package/python-mad/
 F:	package/python-serial/
 F:	package/qextserialport/
@@ -2697,8 +2701,10 @@ F:	package/weston/
 F:	support/testing/tests/boot/test_syslinux.py
 F:	support/testing/tests/package/sample_python_augeas.py
 F:	support/testing/tests/package/sample_python_flask.py
+F:	support/testing/tests/package/sample_python_flask_expects_json.py
 F:	support/testing/tests/package/test_python_augeas.py
 F:	support/testing/tests/package/test_python_flask.py
+F:	support/testing/tests/package/test_python_flask_expects_json.py
 F:	toolchain/
 
 N:	Timo Ketola <timo.ketola@exertus.fi>

package/Config.in

@@ -999,6 +999,7 @@ menu "External python modules"
 	source "package/python-flask/Config.in"
 	source "package/python-flask-babel/Config.in"
 	source "package/python-flask-cors/Config.in"
+	source "package/python-flask-expects-json/Config.in"
 	source "package/python-flask-jsonrpc/Config.in"
 	source "package/python-flask-login/Config.in"
 	source "package/python-flask-sqlalchemy/Config.in"

package/python-flask-expects-json/Config.in

@@ -0,0 +1,9 @@
+config BR2_PACKAGE_PYTHON_FLASK_EXPECTS_JSON
+	bool "python-flask-expects-json"
+	select BR2_PACKAGE_PYTHON_FLASK # runtime
+	select BR2_PACKAGE_PYTHON_JSONSCHEMA # runtime
+	help
+	  Decorator for REST endpoints in flask. Validate JSON request
+	  data.
+
+	  https://github.com/fischerfredl/flask-expects-json

package/python-flask-expects-json/python-flask-expects-json.hash

@@ -0,0 +1,5 @@
+# md5, sha256 from https://pypi.org/pypi/flask-expects-json/json
+md5  c1fb8ede58db312d7923212dc97b8ab4  flask-expects-json-1.5.0.tar.gz
+sha256  0087dc3d089f1ac75a1fc0f259f4dbd02bbb9c356e92e1a080f2309e2f75d053  flask-expects-json-1.5.0.tar.gz
+# Locally computed sha256 checksums
+sha256  06154a99fdc664107294a0a5e7e68f776078d075408dd32bbeaa7340fdd39e73  LICENSE.txt

package/python-flask-expects-json/python-flask-expects-json.mk

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-flask-expects-json
+#
+################################################################################
+
+PYTHON_FLASK_EXPECTS_JSON_VERSION = 1.5.0
+PYTHON_FLASK_EXPECTS_JSON_SOURCE = flask-expects-json-$(PYTHON_FLASK_EXPECTS_JSON_VERSION).tar.gz
+PYTHON_FLASK_EXPECTS_JSON_SITE = https://files.pythonhosted.org/packages/4c/4a/9d9d050af700fb3feebd1f8466e73d65ce8b4709f27773e07100b0993451
+PYTHON_FLASK_EXPECTS_JSON_SETUP_TYPE = setuptools
+PYTHON_FLASK_EXPECTS_JSON_LICENSE = MIT
+PYTHON_FLASK_EXPECTS_JSON_LICENSE_FILES = LICENSE.txt
+
+$(eval $(python-package))

support/testing/tests/package/sample_python_flask_expects_json.py

@@ -0,0 +1,18 @@
+from flask import Flask
+from flask_expects_json import expects_json
+app = Flask(__name__)
+
+schema = {
+    'type': 'object',
+    'properties': {
+        'name': {'type': 'string'},
+        'email': {'type': 'string'},
+    },
+    'required': ['name', 'email']
+}
+
+
+@app.route('/', methods=['POST'])
+@expects_json(schema)
+def hello_world():
+    return 'Hello, World!'

support/testing/tests/package/test_python_flask_expects_json.py

@@ -0,0 +1,38 @@
+from tests.package.test_python import TestPythonPackageBase
+import os
+import time
+
+
+class TestPythonPy3FlaskExpectsJson(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_LIBCURL=y
+        BR2_PACKAGE_LIBCURL_CURL=y
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_FLASK=y
+        BR2_PACKAGE_PYTHON_FLASK_EXPECTS_JSON=y
+        """
+    sample_scripts = ["tests/package/sample_python_flask_expects_json.py"]
+    timeout = 60
+
+    def try_json(self, payload, expects):
+        cmd = """curl -s -o /dev/null -w "%%{http_code}\\n" -X POST """
+        cmd += """-H "Content-Type: application/json" -d '%s' http://127.0.0.1:5000""" % payload
+        output, exit_code = self.emulator.run(cmd, timeout=self.timeout)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[-1], str(expects))
+
+    def test_run(self):
+        self.login()
+        self.check_sample_scripts_exist()
+        cmd = "FLASK_APP=%s %s -m flask run > /dev/null 2>&1 &" % (os.path.basename(self.sample_scripts[0]),
+                                                                   self.interpreter)
+        _, exit_code = self.emulator.run(cmd, timeout=self.timeout)
+
+        # Give enough time for the flask server to start up
+        time.sleep(15)
+
+        self.try_json("""{"email": "test", "name": "test"}""", 200)
+        self.try_json("""{"email": "test", "name": 2}""", 400)
+        self.try_json("""{"email": "test"}""", 400)