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import json

from http.server import HTTPServer, BaseHTTPRequestHandler

from urllib.parse import urlparse, parse_qs

PORT = 5000

class ApiRequestHandler(BaseHTTPRequestHandler):

def __init__(self, request, client_address, ref_req, api_ref):

self.api = api_ref

super().__init__(request, client_address, ref_req)

def call_api(self, method, path, args):

if path in api.routing[method]:

try:

result = api.routing[method][path](args)

self.send_response(200)

self.end_headers()

self.wfile.write(json.dumps(result, indent=4).encode())

except Exception as e:

self.send_response(500, "Server Error")

self.end_headers()

self.wfile.write(json.dumps({ "error": e.args }, indent=4).encode())

else:

self.send_response(404, "Not Found")

self.end_headers()

self.wfile.write(json.dumps({"error": "not found"}, indent=4).encode())

def do_GET(self):

parsed_url = urlparse(self.path)

path = parsed_url.path

args = parse_qs(parsed_url.query)

for k in args.keys():

if len(args[k]) == 1:

args[k] = args[k][0]

self.call_api("GET", path, args)

def do_POST(self):

parsed_url = urlparse(self.path)

path = parsed_url.path

if self.headers.get("content-type") != "application/json":

self.send_response(400)

self.end_headers()

self.wfile.write(json.dumps({

"error": "posted data must be in json format"

}, indent=4).encode())

else:

data_len = int(self.headers.get("content-length"))

data = self.rfile.read(data_len).decode()

self.call_api("POST", path, json.loads(data))

class API():

def __init__(self):

self.routing = { "GET": { }, "POST": { } }

def get(self, path):

def wrapper(fn):

self.routing["GET"][path] = fn

return fn

return wrapper

def post(self, path):

def wrapper(fn):

self.routing["POST"][path] = fn

return fn

return wrapper

def __call__(self, request, client_address, ref_request):

api_handler = ApiRequestHandler(request, client_address, ref_request, api_ref=self)

return api_handler

api = API()

example_data = {

"items": [

{ "id": 1000, "name": "cat", "description": "cat is meowing" },

{ "id": 1001, "name": "dog", "description": "dog is barking" },

{ "id": 1002, "name": "bird", "description": "bird is singing" }

]

}

@api.get("/")

def index(_):

return {

"name": "Python REST API Example",

"summary": "This is simple REST API architecture with pure Python",

"actions": [ "add", "delete", "list", "search" ],

"version": "1.0.0"

}

@api.get("/list")

def list(_):

return {

"count": len(example_data["items"]),

"items": example_data["items"]

}

@api.get("/search")

def search(args):

q = args.get("q", None)

if q is None:

return { "error": "q parameter required" }

else:

results = []

for item in example_data["items"]:

if item["name"].count(q) > 0:

results.append(item)

return { "count": len(results), "items": results }

@api.post("/add")

def add(args):

id = example_data["items"].copy().pop()["id"] + 1

name = args.get("name", None)

description = args.get("description", None)

if name is None or description is None:

return { "error": "name and description are required parameters" }

else:

item = { "id": id, "name": name, "description": description }

example_data["items"].append(item)

return item

@api.post("/delete")

def delete(args):

id = args.get("id", None)

if id is None:

return { "error": "id parameter required" }

else:

item_deleted = False

for item in example_data["items"]:

if item["id"] == id:

example_data["items"].remove(item)

item_deleted = True

break

if item_deleted:

return { "deleted": id }

else:

return { "error": f"item not found with id {id}" }

if __name__ == "__main__":

httpd = HTTPServer(('', PORT), api)

print(f"Application started at http://127.0.0.1:{PORT}/")

httpd.serve_forever()