Initial work

.env.dist

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+TOKEN=sigbvddvujkbsihxhktp
+LED_PIN=18
+TIMES_TO_BLINK=5
+SECONDS_TO_BLINK_ON=2

.gitignore

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+.env

api.py

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+from flask import Flask, request, make_response, abort
+from ledapi import led
+from dotenv import load_dotenv
+import os
+
+load_dotenv()
+app = Flask(__name__)
+
+TOKEN = os.getenv('TOKEN')
+LED_PIN = os.getenv('LED_PIN')
+TIMES_TO_BLINK = os.getenv('TIMES_TO_BLINK')
+SECONDS_TO_BLINK_ON = os.getenv('SECONDS_TO_BLINK_ON')
+
+
+@app.route('/warning-light/<token>', methods=['POST'])
+def warning_light(token):
+    if request.method == 'POST':
+        if token == os.getenv(TOKEN):
+            led.go(LED_PIN, num_times=TIMES_TO_BLINK, seconds_on=SECONDS_TO_BLINK_ON)
+            return make_response(('', 202))
+        else:
+            abort(401)
+    else:
+        abort(501)
+
+
+if __name__ == '__main__':
+    app.run(debug=True, port=5000)

ledapi/led.py

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+import RPi.GPIO as GPIO
+import time
+
+
+def setup(led_pin):
+    # setup
+    GPIO.setmode(GPIO.BOARD)
+    GPIO.setwarnings(False)
+    GPIO.setup(led_pin, GPIO.OUT, initial=GPIO.LOW)
+
+
+def blink_led(led_pin, num_times=1, seconds_on=1):
+    i = 1
+    while i <= num_times:
+        # led on
+        GPIO.output(led_pin, GPIO.HIGH)
+        time.sleep(seconds_on)
+        # led off
+        GPIO.output(led_pin, GPIO.LOW)
+
+
+def tear_down():
+    GPIO.cleanup()
+
+
+def go(led_pin, num_times, seconds_on):
+    setup(led_pin)
+    blink_led(led_pin, num_times=num_times, seconds_on=seconds_on)
+    tear_down()
+
+
+if __name__ == '__main__':
+    go(18, 5, 2)

requirements.txt

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+Click==7.0
+Flask==1.0.2
+itsdangerous==1.1.0
+Jinja2==2.10
+MarkupSafe==1.1.0
+pkg-resources==0.0.0
+RPi.GPIO==0.6.5
+Werkzeug==0.14.1