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107 lines
3.1 KiB
Elixir
107 lines
3.1 KiB
Elixir
defmodule PhilomenaProxy.Http do
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@moduledoc """
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HTTP client implementation.
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This applies the Philomena User-Agent header, and optionally proxies traffic through a SOCKS5
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HTTP proxy to allow the application to connect when the local network is restricted.
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If a proxy host is not specified in the configuration, then a proxy is not used and external
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traffic is originated from the same network as application.
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Proxy options are read from environment variables at runtime by Philomena.
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config :philomena,
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proxy_host: System.get_env("PROXY_HOST"),
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"""
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@type url :: String.t()
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@type header_list :: [{String.t(), String.t()}]
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@type body :: binary()
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@type client_options :: keyword()
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@doc ~S"""
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Perform a HTTP GET request.
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## Example
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iex> PhilomenaProxy.Http.get("http://example.com", [{"authorization", "Bearer #{token}"}])
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{:ok, %Tesla.Env{...}}
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iex> PhilomenaProxy.Http.get("http://nonexistent.example.com")
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{:error, %Mint.TransportError{reason: :nxdomain}}
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"""
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@spec get(url(), header_list(), client_options()) :: Tesla.Env.result()
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def get(url, headers \\ [], options \\ []) do
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Tesla.get(client(headers), url, opts: [adapter: adapter_opts(options)])
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end
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@doc ~S"""
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Perform a HTTP HEAD request.
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## Example
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iex> PhilomenaProxy.Http.head("http://example.com", [{"authorization", "Bearer #{token}"}])
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{:ok, %Tesla.Env{...}}
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iex> PhilomenaProxy.Http.head("http://nonexistent.example.com")
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{:error, %Mint.TransportError{reason: :nxdomain}}
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"""
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@spec head(url(), header_list(), client_options()) :: Tesla.Env.result()
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def head(url, headers \\ [], options \\ []) do
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Tesla.head(client(headers), url, opts: [adapter: adapter_opts(options)])
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end
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@doc ~S"""
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Perform a HTTP POST request.
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## Example
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iex> PhilomenaProxy.Http.post("http://example.com", "", [{"authorization", "Bearer #{token}"}])
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{:ok, %Tesla.Env{...}}
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iex> PhilomenaProxy.Http.post("http://nonexistent.example.com", "")
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{:error, %Mint.TransportError{reason: :nxdomain}}
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"""
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@spec post(url(), body(), header_list(), client_options()) :: Tesla.Env.result()
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def post(url, body, headers \\ [], options \\ []) do
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Tesla.post(client(headers), url, body, opts: [adapter: adapter_opts(options)])
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end
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defp adapter_opts(opts) do
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opts = Keyword.merge(opts, max_body: 125_000_000, inet6: true)
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case Application.get_env(:philomena, :proxy_host) do
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nil ->
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opts
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url ->
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Keyword.merge(opts, proxy: proxy_opts(URI.parse(url)))
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end
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end
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defp proxy_opts(%{host: host, port: port, scheme: "https"}),
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do: {:https, host, port, [transport_opts: [inet6: true]]}
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defp proxy_opts(%{host: host, port: port, scheme: "http"}),
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do: {:http, host, port, [transport_opts: [inet6: true]]}
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defp client(headers) do
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Tesla.client(
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[
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{Tesla.Middleware.FollowRedirects, max_redirects: 1},
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{Tesla.Middleware.Headers,
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[
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{"User-Agent",
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"Mozilla/5.0 (X11; Philomena; Linux x86_64; rv:86.0) Gecko/20100101 Firefox/86.0"}
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| headers
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]}
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],
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Tesla.Adapter.Mint
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)
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end
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end
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