311 lines
8.6 KiB
Elixir
311 lines
8.6 KiB
Elixir
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defmodule MIME do
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@moduledoc """
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Maps MIME types to its file extensions and vice versa.
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MIME types can be extended in your application configuration
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as follows:
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config :mime, :types, %{
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"application/vnd.api+json" => ["json-api"]
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}
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Note that defining a new type will completely override all
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previous extensions. You can use `MIME.extensions/1` to get
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the existing extension to keep when redefining.
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You can also customize the extensions for suffixes. For example,
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the mime type "application/custom+gzip" returns the extension
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`".gz"` because the suffix "gzip" maps to `["gz"]`:
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config :mime, :suffixes, %{
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"gzip" => ["gz"]
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}
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After adding the configuration, MIME needs to be recompiled
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if you are using an Elixir version earlier than v1.15. In such
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cases, it can be done with:
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$ mix deps.clean mime --build
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"""
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types = %{
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"application/atom+xml" => ["atom"],
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"application/epub+zip" => ["epub"],
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"application/gzip" => ["gz"],
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"application/java-archive" => ["jar"],
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"application/javascript" => ["js"],
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"application/json" => ["json"],
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"application/json-patch+json" => ["json-patch"],
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"application/ld+json" => ["jsonld"],
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"application/manifest+json" => ["webmanifest"],
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"application/msword" => ["doc"],
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"application/octet-stream" => ["bin"],
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"application/ogg" => ["ogx"],
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"application/pdf" => ["pdf"],
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"application/postscript" => ["ps", "eps", "ai"],
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"application/rss+xml" => ["rss"],
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"application/rtf" => ["rtf"],
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"application/vnd.amazon.ebook" => ["azw"],
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"application/vnd.api+json" => ["json-api"],
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"application/vnd.apple.installer+xml" => ["mpkg"],
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"application/vnd.etsi.asic-e+zip" => ["asice", "sce"],
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"application/vnd.etsi.asic-s+zip" => ["asics", "scs"],
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"application/vnd.mozilla.xul+xml" => ["xul"],
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"application/vnd.ms-excel" => ["xls"],
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"application/vnd.ms-fontobject" => ["eot"],
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"application/vnd.ms-powerpoint" => ["ppt"],
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"application/vnd.oasis.opendocument.presentation" => ["odp"],
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"application/vnd.oasis.opendocument.spreadsheet" => ["ods"],
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"application/vnd.oasis.opendocument.text" => ["odt"],
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"application/vnd.openxmlformats-officedocument.presentationml.presentation" => ["pptx"],
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"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" => ["xlsx"],
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"application/vnd.openxmlformats-officedocument.wordprocessingml.document" => ["docx"],
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"application/vnd.rar" => ["rar"],
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"application/vnd.visio" => ["vsd"],
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"application/wasm" => ["wasm"],
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"application/x-7z-compressed" => ["7z"],
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"application/x-abiword" => ["abw"],
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"application/x-bzip" => ["bz"],
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"application/x-bzip2" => ["bz2"],
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"application/x-cdf" => ["cda"],
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"application/x-csh" => ["csh"],
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"application/x-freearc" => ["arc"],
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"application/x-httpd-php" => ["php"],
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"application/x-msaccess" => ["mdb"],
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"application/x-sh" => ["sh"],
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"application/x-shockwave-flash" => ["swf"],
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"application/x-tar" => ["tar"],
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"application/xhtml+xml" => ["xhtml"],
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"application/xml" => ["xml"],
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"application/zip" => ["zip"],
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"audio/3gpp" => ["3gp"],
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"audio/3gpp2" => ["3g2"],
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"audio/aac" => ["aac"],
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"audio/midi" => ["mid", "midi"],
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"audio/mpeg" => ["mp3"],
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"audio/ogg" => ["oga"],
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"audio/opus" => ["opus"],
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"audio/wav" => ["wav"],
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"audio/webm" => ["weba"],
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"font/otf" => ["otf"],
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"font/ttf" => ["ttf"],
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"font/woff" => ["woff"],
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"font/woff2" => ["woff2"],
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"image/avif" => ["avif"],
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"image/bmp" => ["bmp"],
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"image/gif" => ["gif"],
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"image/heic" => ["heic"],
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"image/heif" => ["heif"],
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"image/jpeg" => ["jpg", "jpeg"],
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"image/jxl" => ["jxl"],
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"image/png" => ["png"],
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"image/svg+xml" => ["svg", "svgz"],
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"image/tiff" => ["tiff", "tif"],
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"image/vnd.adobe.photoshop" => ["psd"],
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"image/vnd.microsoft.icon" => ["ico"],
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"image/webp" => ["webp"],
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"text/calendar" => ["ics"],
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"text/css" => ["css"],
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"text/csv" => ["csv"],
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"text/html" => ["html", "htm"],
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"text/javascript" => ["js", "mjs"],
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"text/markdown" => ["md", "markdown"],
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"text/plain" => ["txt", "text"],
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"text/xml" => ["xml"],
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"video/3gpp" => ["3gp"],
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"video/3gpp2" => ["3g2"],
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"video/mp2t" => ["ts"],
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"video/mp4" => ["mp4"],
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"video/mpeg" => ["mpeg", "mpg"],
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"video/ogg" => ["ogv"],
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"video/quicktime" => ["mov"],
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"video/webm" => ["webm"],
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"video/x-ms-wmv" => ["wmv"],
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"video/x-msvideo" => ["avi"]
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}
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require Application
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custom_types = Application.compile_env(:mime, :types, %{})
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to_exts = fn map ->
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for {media, exts} <- map, ext <- exts, reduce: %{} do
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acc -> Map.update(acc, ext, media, &[media | List.wrap(&1)])
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end
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end
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all_types = Map.merge(types, custom_types)
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default_exts = %{
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"3g2" => "video/3gpp2",
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"3gp" => "video/3gpp",
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"js" => "text/javascript",
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"xml" => "text/xml"
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}
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custom_exts = Application.compile_env(:mime, :extensions, %{})
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all_exts = Map.merge(to_exts.(all_types), Map.merge(default_exts, custom_exts))
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# https://www.iana.org/assignments/media-type-structured-suffix/media-type-structured-suffix.xhtml
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default_suffixes = %{
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"gzip" => ["gz"],
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"json" => ["json"],
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"xml" => ["xml"],
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"zip" => ["zip"]
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}
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custom_suffixes = Application.compile_env(:mime, :suffixes, %{})
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suffixes = Map.merge(default_suffixes, custom_suffixes)
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@doc """
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Returns the custom types compiled into the MIME module.
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"""
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def compiled_custom_types do
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unquote(Macro.escape(custom_types))
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end
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@doc """
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Returns the extensions associated with a given MIME type.
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## Examples
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iex> MIME.extensions("text/html")
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["html", "htm"]
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iex> MIME.extensions("application/json")
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["json"]
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iex> MIME.extensions("application/vnd.custom+xml")
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["xml"]
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iex> MIME.extensions("foo/bar")
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[]
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"""
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@spec extensions(String.t()) :: [String.t()]
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def extensions(type) do
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mime =
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type
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|> strip_params()
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|> downcase("")
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mime_to_ext(mime) || suffix(mime) || []
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end
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defp suffix(type) do
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case String.split(type, "+") do
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[_type_subtype_without_suffix, suffix] -> suffix_to_ext(suffix)
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_ -> nil
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end
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end
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@default_type "application/octet-stream"
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@doc """
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Returns the MIME type associated with a file extension.
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If no MIME type is known for `file_extension`,
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`#{inspect(@default_type)}` is returned.
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## Examples
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iex> MIME.type("html")
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"text/html"
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iex> MIME.type("foobarbaz")
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#{inspect(@default_type)}
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"""
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@spec type(String.t()) :: String.t()
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def type(file_extension) do
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ext_to_mime(file_extension) || @default_type
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end
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@doc """
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Returns whether an extension has a MIME type registered.
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## Examples
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iex> MIME.has_type?("html")
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true
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iex> MIME.has_type?("foobarbaz")
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false
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"""
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@spec has_type?(String.t()) :: boolean
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def has_type?(file_extension) do
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is_binary(ext_to_mime(file_extension))
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end
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@doc """
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Guesses the MIME type based on the path's extension. See `type/1`.
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## Examples
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iex> MIME.from_path("index.html")
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"text/html"
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"""
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@spec from_path(Path.t()) :: String.t()
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def from_path(path) do
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case Path.extname(path) do
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"." <> ext -> type(downcase(ext, ""))
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_ -> @default_type
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end
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end
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defp strip_params(string) do
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string |> :binary.split(";") |> hd()
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end
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defp downcase(<<h, t::binary>>, acc) when h in ?A..?Z,
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do: downcase(t, <<acc::binary, h + 32>>)
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defp downcase(<<h, t::binary>>, acc), do: downcase(t, <<acc::binary, h>>)
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defp downcase(<<>>, acc), do: acc
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@spec ext_to_mime(String.t()) :: String.t() | nil
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defp ext_to_mime(type)
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for {ext, mimes} <- all_exts do
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case mimes do
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[first | _] ->
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raise """
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extension .#{ext} currently maps to different mime-types: #{inspect(mimes)}
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You must tell us which mime-type is preferred by defining the :extensions \
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configuration. For example:
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config :mime, :extensions, %{
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#{inspect(ext)} => #{inspect(first)}
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}
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"""
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mime ->
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defp ext_to_mime(unquote(ext)), do: unquote(mime)
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end
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end
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defp ext_to_mime(_ext), do: nil
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@spec mime_to_ext(String.t()) :: list(String.t()) | nil
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defp mime_to_ext(type)
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for {type, exts} <- all_types do
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defp mime_to_ext(unquote(type)), do: unquote(List.wrap(exts))
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end
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defp mime_to_ext(_type), do: nil
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@spec suffix_to_ext(String.t()) :: list(String.t()) | nil
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defp suffix_to_ext(suffix)
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for {suffix, exts} <- suffixes do
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defp suffix_to_ext(unquote(suffix)), do: unquote(List.wrap(exts))
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end
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defp suffix_to_ext(_suffix), do: nil
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end
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