A really basic, not so safe web server.
Project description
SMDB Web Server
An easy to use, not secured web server, because I don't like the other options, and I like to create my own solutions most of the time.
Table of content
| Section Name |
|---|
| Usage |
| Get handler |
| Put Handler |
| Data |
Usage
To start using this HTTP Server, import the HTMLServer class, and initialize it.
from smdb_web_server import HTMLServer, UrlData
server = HTMLServer("127.0.0.1", 8080, title="Example server")
An smdb_logger can be used, if desired, but not neccesery.
To add a new url path, use the add_url_rule command.
def index_handler(url_data: UrlData) -> str:
...
server.add_url_rule("/", index_handler)
This method will be called with a GET request by default. This can be set as an optional parameter called protocol. For now, only GET and PUT are supported.
Url handlers can be assigned with a decorator as well:
@server.as_url_rule("/help")
def help_handler(url_data: UrlData) -> str:
...
To start the server, use either the serve_forever or the serve_forever_threaded function. The first will be a blocking call, the second will create a new thread.
server.serve_forever_threaded(template_dictionary, static_dictionary, "Example Thread")
Both handlers can fail with KnownError exception, whitch will result in a user controlled return code and reason.
GET handler
This handler can return any string, but it's usefull, if it returns an HTML file as string. This can be a hardcoded HTML code, or a static or dynamic file. For rendering HTML template files, the server has a helper function called render_template_file. This can render an HTML file from a pre setup dictionary.
def index_handler(url_data: UrlData) -> str:
example_list = ["value1", "value2|False", "value3|True"]
return server.render_template("index", page_title="Example Title", example_selector=example_list, button_1="Button 1 name", button_2="Button 2 name")
If you need to just create a list to update an already rendered HTML page's selector, you can use it the following way:
def update(url_data: UrlData):
return server.render_template_list("example_selector", ["value1|True", "value2|False", "value3|False"])
server.add_url_rule("/update", update)
This will result in the following list, if we use the option tag as shown in the template_dictionary in the data paragraph:
<option disabled></option>
<option value="value1" selected>value1</option>
<option value="value2">value2</option>
<option value="value3">value3</option>
This list will be sent as a plaintext response.
Put Handler
This handler can return a simple string. The incoming data will be a bytearray of the body of the request.
from smdb_web_server import Protocol
def put_handler(url_data: UrlData) -> str:
# Do stuff here.
# Either return with string, or fail with KnownError
...
server.add_url_rule("/put", put_handler, Protocol.Put)
Data
Template dictionary
- Keys: The "file name" without extention
- Value: The file's content, or a path in the following format: "PATH|{Relative path to file}"
This dictionary will be used to generate HTML response from the template. Theese templates can have replaceable values with the following format.
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>{{ page_title }}</title>
<link rel="stylesheet" href="/static/style.css">
</head>
<body>
<div class="container">
<h2>Example Header</h2>
<div class="grid-container">
<label for="ExampleSelector">Example Selector:</label>
<select id="ExampleSelector" class="fixed-width">
{{[ example_selector ]}}
</select>
<div class="button-group">
<button id="ExampleButton1">{{ button_1 }}</button>
<button id="ExampleButton2">{{ button_2 }}</button>
</div>
</div>
</div>
<script src="/static/script.js"></script>
</body>
</html>
In this page the {{ page_title }}, the {{ button_1 }} and the {{ button_2 }} will be replaced with one value, and the {{[ ExampleSelector ]}} will be generated using a list.
This dictionary should contain a key-value pair with the value being a repeateable value to fill the {{[ ExampleSelector ]}} place.
selector_values = """<option value="{{VALUE}}"{{SELECTED}}>{{VALUE}}</option>"""
Here, the {{VALUE}} will be replaced by the list's content, and the {{SELECTED}} will be replaced by either the value selected or with an emty string, if the list's value is formatted in the following manner: {value}|True. If the value following the | character is not "True", it will be treated as if it was not present.
You can return a list by calling the render_template_list function by itself, or by rendering a full HTML page by calling render_template, with a list as an argument.
Static dictionary
- Keys: The "file name" without extention
- Value: Either the file's content, or a path in the following format: "PATH|{Relative path to file}"
Static files will be sent automatically, if the correct URL is called. In the Template Dictionary example, the javascript and the css files are loaded from the path /static/{file_name}. This will result in the {file_name} file being served from the dictionary.
KnownError
This error is used to send a usercontrolled response code to the requester. This exception can be used the following way:
from smdb_web_server import KnownError
def fail(_):
raise KnownError("Reason", 405)
Protocol
This is a simple enum class to use with add_url_rule to determine the protocol to be used
Values: Get, Put
UrlData
This dataclass contains the following fields, either filled or containing None:
- fragment:
Stringobject (Data following the#in the URL) - query:
Dictionarywith string keys and values (Data following the?in the URL). The key will be the part following the?or&characters, and the value will be the part after the=sign. If there is no value,Nonewill be used as a value in the dictionary. - data:
Bytesobject (Payload of the request, if available)
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