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100 lines
2.8 KiB
Elixir
100 lines
2.8 KiB
Elixir
defmodule Mobilizon.Service.RichMedia.Favicon do
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@moduledoc """
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Module to fetch favicon information from a website
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Taken and adapted from https://github.com/ricn/favicon
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"""
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require Logger
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alias Mobilizon.Config
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@options [
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max_body: 2_000_000,
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timeout: 10_000,
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recv_timeout: 20_000,
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follow_redirect: true,
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ssl: [{:versions, [:"tlsv1.2"]}]
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]
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@spec fetch(String.t(), Enum.t()) :: {:ok, String.t()} | {:error, any()}
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def fetch(url, options \\ []) do
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user_agent = Keyword.get(options, :user_agent, Config.instance_user_agent())
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headers = [{"User-Agent", user_agent}]
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case Tesla.get(url, headers: headers, opts: @options) do
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{:ok, %{status: code, body: body}} when code in 200..299 ->
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find_favicon_url(url, body, headers)
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{:ok, %{}} ->
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{:error, "Error while fetching the page"}
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{:error, err} ->
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{:error, err}
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end
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end
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@spec find_favicon_url(String.t(), String.t(), Enum.t()) :: {:ok, String.t()} | {:error, any()}
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defp find_favicon_url(url, body, headers) do
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Logger.debug("finding favicon URL for #{url}")
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case find_favicon_link_tag(body) do
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{:ok, tag} ->
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Logger.debug("Found link #{inspect(tag)}")
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{"link", attrs, _} = tag
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{"href", path} =
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Enum.find(attrs, fn {name, _} ->
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name == "href"
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end)
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{:ok, format_url(url, path)}
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_ ->
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find_favicon_in_root(url, headers)
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end
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end
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@spec format_url(String.t(), String.t()) :: String.t()
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defp format_url(url, path) do
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url
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|> URI.parse()
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|> URI.merge(path)
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|> to_string()
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end
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@spec find_favicon_link_tag(String.t()) :: {:ok, tuple()} | {:error, any()}
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defp find_favicon_link_tag(html) do
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with {:ok, html} <- Floki.parse_document(html),
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links <- Floki.find(html, "link"),
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{:link, link} when not is_nil(link) <-
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{:link,
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Enum.find(links, fn {"link", attrs, _} ->
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Enum.any?(attrs, fn {name, value} ->
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name == "rel" && String.contains?(value, "icon") &&
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!String.contains?(value, "-icon-")
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end)
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end)} do
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{:ok, link}
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else
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{:link, nil} -> {:error, "No link found"}
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err -> err
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end
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end
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@spec find_favicon_in_root(String.t(), Enum.t()) :: {:ok, String.t()} | {:error, any()}
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defp find_favicon_in_root(url, headers) do
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uri = URI.parse(url)
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favicon_url = "#{uri.scheme}://#{uri.host}/favicon.ico"
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case Tesla.head(favicon_url, headers: headers, opts: @options) do
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{:ok, %{status: code}} when code in 200..299 ->
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{:ok, favicon_url}
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{:ok, %{}} ->
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{:error, "Error while doing a HEAD request on the favicon"}
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{:error, err} ->
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{:error, err}
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end
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end
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end
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