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A Utilitary package functionalities modules for improve a secure performatic development.
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lib/krug/util/image.util.ex
defmodule Krug.ImageUtil do
@moduledoc """
Utilitary module to work with images.
"""
alias Krug.StringUtil
@doc """
Validates a url relative to a image stored in cloud.
Should be an ```HTTPS``` link and the image should be of type: ```["png","bmp","jpg","jpeg","gif"]```.
Useful to block the use of images that don't are serverd over https protocol
and could break application security.
## Examples
```elixir
iex > url = "www.google.com"
iex > Krug.ImageUtil.validate_url(url)
false
```
```elixir
iex > url = "http://www.google.com"
iex > Krug.ImageUtil.validate_url(url)
false
```
```elixir
iex > url = "https://www.google.com.br"
iex > Krug.ImageUtil.validate_url(url)
false
```
```elixir
iex > url = "https://www.google.com.png"
iex > Krug.ImageUtil.validate_url(url)
true
```
```elixir
iex > url = "https://www.google.com.gif"
iex > Krug.ImageUtil.validate_url(url)
true
```
"""
def validate_url(url) do
url = url |> StringUtil.trim()
cond do
(!(String.contains?(url,"https://")) or !(String.contains?(url,"."))) -> false
(String.length(url) < 13) -> false
(url |> StringUtil.split(":") |> Enum.at(0) != "https") -> false
true -> url |> StringUtil.split(".") |> validate_url_extension()
end
end
defp validate_url_extension(arr) do
ext = Enum.at(arr,length(arr) - 1) |> StringUtil.trim() |> String.downcase()
Enum.member?(["png","bmp","jpg","jpeg","gif"],ext)
end
end