# Net

Built-in library for network access

#### Example usage

```lua
local net = require("@lune/net")

-- Sending a web request
local response = net.request("https://www.google.com")
print(response.ok)
print(response.statusCode, response.statusMessage)
print(response.headers)

-- Using a JSON web API
local response = net.request({
	url = "https://dummyjson.com/products/add",
	method = "POST",
	headers = { ["Content-Type"] = "application/json" },
	body = net.jsonEncode({
		title = "Cool Pencil",
	})
})
local product = net.jsonDecode(response.body)
print(product.id, "-", product.title)

-- Starting up a webserver
net.serve(8080, function(request)
	return {
		status = 200,
		body = "Echo:\n" .. request.body,
	}
end)
```

## Functions

### request

Sends an HTTP request using the given url and / or parameters, and returns a dictionary that
describes the response received.

Only throws an error if a miscellaneous network or I/O error occurs, never for unsuccessful status
codes.

#### Parameters

-   `config` The URL or request config to use

#### Returns

-   A dictionary representing the response for the request

---

### socket

Connects to a web socket at the given URL.

Throws an error if the server at the given URL does not support web sockets, or if a miscellaneous
network or I/O error occurs.

#### Parameters

-   `url` The URL to connect to

#### Returns

-   A web socket handle

---

### serve

Creates an HTTP server that listens on the given `port`.

This will **_not_** block and will keep listening for requests on the given `port` until the `stop`
function on the returned `ServeHandle` has been called.

#### Parameters

-   `port` The port to use for the server

-   `handlerOrConfig` The handler function or config to use for the server

#### Returns

-   ServeHandle

---

### jsonEncode

Encodes the given value as JSON.

#### Parameters

-   `value` The value to encode as JSON

-   `pretty` If the encoded JSON string should include newlines and spaces. Defaults to false

#### Returns

-   The encoded JSON string

---

### jsonDecode

Decodes the given JSON string into a lua value.

#### Parameters

-   `encoded` The JSON string to decode

#### Returns

-   The decoded lua value

---

### urlEncode

Encodes the given string using URL encoding.

#### Parameters

-   `s` The string to encode

-   `binary` If the string should be treated as binary data and/or is not valid utf-8. Defaults to
    false

#### Returns

-   The encoded string

---

### urlDecode

Decodes the given string using URL decoding.

#### Parameters

-   `s` The string to decode

-   `binary` If the string should be treated as binary data and/or is not valid utf-8. Defaults to
    false

#### Returns

-   The decoded string

---

## Types

### FetchParamsOptions

Extra options for `FetchParams`.

This is a dictionary that may contain one or more of the following values:

-   `decompress` - If the request body should be automatically decompressed when possible. Defaults
    to `true`

---

### FetchParams

Parameters for sending network requests with `net.request`.

This is a dictionary that may contain one or more of the following values:

-   `url` - The URL to send a request to. This is always required
-   `method` - The HTTP method verb, such as `"GET"`, `"POST"`, `"PATCH"`, `"PUT"`, or `"DELETE"`.
    Defaults to `"GET"`
-   `body` - The request body
-   `query` - A table of key-value pairs representing query parameters in the request path
-   `headers` - A table of key-value pairs representing headers
-   `options` - Extra options for things such as automatic decompression of response bodies

---

### FetchResponse

Response type for sending network requests with `net.request`.

This is a dictionary containing the following values:

-   `ok` - If the status code is a canonical success status code, meaning within the range 200 ->
    299
-   `statusCode` - The status code returned for the request
-   `statusMessage` - The canonical status message for the returned status code, such as
    `"Not Found"` for status code 404
-   `headers` - A table of key-value pairs representing headers
-   `body` - The request body, or an empty string if one was not given

---

### ServeRequest

Data type for requests in `net.serve`.

This is a dictionary containing the following values:

-   `path` - The path being requested, relative to the root. Will be `/` if not specified
-   `query` - A table of key-value pairs representing query parameters in the request path
-   `method` - The HTTP method verb, such as `"GET"`, `"POST"`, `"PATCH"`, `"PUT"`, or `"DELETE"`.
    Will always be uppercase
-   `headers` - A table of key-value pairs representing headers
-   `body` - The request body, or an empty string if one was not given

---

### ServeResponse

Response type for requests in `net.serve`.

This is a dictionary that may contain one or more of the following values:

-   `status` - The status code for the request, in the range `100` -> `599`
-   `headers` - A table of key-value pairs representing headers
-   `body` - The response body

---

### ServeConfig

Configuration for `net.serve`.

This may contain one of, or both of the following callbacks:

-   `handleRequest` for handling normal http requests, equivalent to just passing a function to
    `net.serve`
-   `handleWebSocket` for handling web socket requests, which will receive a `WebSocket` object as
    its first and only parameter

---

### ServeHandle

A handle to a currently running web server, containing a single `stop` function to gracefully shut
down the web server.

---

### WebSocket

A reference to a web socket connection.

The web socket may be in either an "open" or a "closed" state, changing its current behavior.

When open:

-   Any function on the socket such as `send`, `next` or `close` can be called without erroring
-   `next` can be called to yield until the next message is received or the socket becomes closed

When closed:

-   `next` will no longer return any message(s) and instead instantly return nil
-   `send` will throw an error stating that the socket has been closed

Once the websocket has been closed, `closeCode` will no longer be nil, and will be populated with a
close code according to the
[WebSocket specification](https://www.iana.org/assignments/websocket/websocket.xhtml). This will be
an integer between 1000 and 4999, where 1000 is the canonical code for normal, error-free closure.

---