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# Picoweb web pico-framework for MicroPython
# Copyright (c) 2014-2018 Paul Sokolovsky
# SPDX-License-Identifier: MIT
import sys
import gc
import micropython
import utime
import uio
import ure as re
import uerrno
import uasyncio as asyncio
def unquote_plus(s):
# TODO: optimize
s = s.replace("+", " ")
arr = s.split("%")
arr2 = [chr(int(x[:2], 16)) + x[2:] for x in arr[1:]]
return arr[0] + "".join(arr2)
def parse_qs(s):
res = {}
if s:
pairs = s.split("&")
for p in pairs:
vals = [unquote_plus(x) for x in p.split("=", 1)]
if len(vals) == 1:
vals.append(True)
old = res.get(vals[0])
if old is not None:
if not isinstance(old, list):
old = [old]
res[vals[0]] = old
old.append(vals[1])
else:
res[vals[0]] = vals[1]
return res
def get_mime_type(fname):
# Provide minimal detection of important file
# types to keep browsers happy
if fname.endswith(".html"):
return "text/html"
if fname.endswith(".css"):
return "text/css"
if fname.endswith(".png") or fname.endswith(".jpg"):
return "image"
return "text/plain"
def sendstream(writer, f):
buf = bytearray(64)
while True:
l = f.readinto(buf)
if not l:
break
yield from writer.awrite(buf, 0, l)
def jsonify(writer, dict):
import ujson
yield from start_response(writer, "application/json")
yield from writer.awrite(ujson.dumps(dict))
def start_response(writer, content_type="text/html", status="200", headers=None):
yield from writer.awrite("HTTP/1.0 %s NA\r\n" % status)
yield from writer.awrite("Content-Type: ")
yield from writer.awrite(content_type)
if not headers:
yield from writer.awrite("\r\n\r\n")
return
yield from writer.awrite("\r\n")
if isinstance(headers, bytes) or isinstance(headers, str):
yield from writer.awrite(headers)
else:
for k, v in headers.items():
yield from writer.awrite(k)
yield from writer.awrite(": ")
yield from writer.awrite(v)
yield from writer.awrite("\r\n")
yield from writer.awrite("\r\n")
def http_error(writer, status):
yield from start_response(writer, status=status)
yield from writer.awrite(status)
class HTTPRequest:
def __init__(self):
pass
def read_form_data(self):
size = int(self.headers[b"Content-Length"])
data = yield from self.reader.read(size)
form = parse_qs(data.decode())
self.form = form
def parse_qs(self):
form = parse_qs(self.qs)
self.form = form
class WebApp:
def __init__(self, pkg, routes=None):
if routes:
self.url_map = routes
else:
self.url_map = []
if pkg and pkg != "__main__":
self.pkg = pkg.split(".", 1)[0]
else:
self.pkg = None
self.mounts = []
self.inited = False
# Instantiated lazily
self.template_loader = None
self.headers_mode = "parse"
def parse_headers(self, reader):
headers = {}
while True:
l = yield from reader.readline()
if l == b"\r\n":
break
k, v = l.split(b":", 1)
headers[k] = v.strip()
return headers
def _handle(self, reader, writer):
close = True
try:
request_line = yield from reader.readline()
if request_line == b"":
yield from writer.aclose()
return
req = HTTPRequest()
# TODO: bytes vs str
request_line = request_line.decode()
method, path, proto = request_line.split()
path = path.split("?", 1)
qs = ""
if len(path) > 1:
qs = path[1]
path = path[0]
#print("================")
#print(req, writer)
#print(req, (method, path, qs, proto), req.headers)
# Find which mounted subapp (if any) should handle this request
app = self
while True:
found = False
for subapp in app.mounts:
root = subapp.url
#print(path, "vs", root)
if path[:len(root)] == root:
app = subapp
found = True
path = path[len(root):]
if not path.startswith("/"):
path = "/" + path
break
if not found:
break
# We initialize apps on demand, when they really get requests
if not app.inited:
app.init()
# Find handler to serve this request in app's url_map
found = False
for e in app.url_map:
pattern = e[0]
handler = e[1]
extra = {}
if len(e) > 2:
extra = e[2]
if path == pattern:
found = True
break
elif not isinstance(pattern, str):
# Anything which is non-string assumed to be a ducktype
# pattern matcher, whose .match() method is called. (Note:
# Django uses .search() instead, but .match() is more
# efficient and we're not exactly compatible with Django
# URL matching anyway.)
m = pattern.match(path)
if m:
req.url_match = m
found = True
break
if not found:
headers_mode = "skip"
else:
headers_mode = extra.get("headers", self.headers_mode)
if headers_mode == "skip":
while True:
l = yield from reader.readline()
if l == b"\r\n":
break
elif headers_mode == "parse":
req.headers = yield from self.parse_headers(reader)
else:
assert headers_mode == "leave"
if found:
req.method = method
req.path = path
req.qs = qs
req.reader = reader
close = yield from handler(req, writer)
else:
yield from start_response(writer, status="404")
yield from writer.awrite("404\r\n")
#print(req, "After response write")
except Exception as e:
pass
if close is not False:
yield from writer.aclose()
def mount(self, url, app):
"Mount a sub-app at the url of current app."
# Inspired by Bottle. It might seem that dispatching to
# subapps would rather be handled by normal routes, but
# arguably, that's less efficient. Taking into account
# that paradigmatically there's difference between handing
# an action and delegating responisibilities to another
# app, Bottle's way was followed.
app.url = url
self.mounts.append(app)
def route(self, url, **kwargs):
def _route(f):
self.url_map.append((url, f, kwargs))
return f
return _route
def add_url_rule(self, url, func, **kwargs):
# Note: this method skips Flask's "endpoint" argument,
# because it's alleged bloat.
self.url_map.append((url, func, kwargs))
def _load_template(self, tmpl_name):
if self.template_loader is None:
import utemplate.source
self.template_loader = utemplate.source.Loader(self.pkg, "templates")
return self.template_loader.load(tmpl_name)
def render_template(self, writer, tmpl_name, args=()):
tmpl = self._load_template(tmpl_name)
for s in tmpl(*args):
yield from writer.awrite(s)
def render_str(self, tmpl_name, args=()):
#TODO: bloat
tmpl = self._load_template(tmpl_name)
return ''.join(tmpl(*args))
def init(self):
"""Initialize a web application. This is for overriding by subclasses.
This is good place to connect to/initialize a database, for example."""
self.inited = True
def run(self, host="0.0.0.0", port=80, lazy_init=False):
gc.collect()
self.init()
if not lazy_init:
for app in self.mounts:
app.init()
loop = asyncio.get_event_loop()
loop.create_task(asyncio.start_server(self._handle, host, port))
loop.run_forever()
loop.close()