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- %% Feel free to use, reuse and abuse the code in this file.
- %% @doc Pastebin handler.
- -module(toppage_handler).
- %% Standard callbacks.
- -export([init/2]).
- -export([allowed_methods/2]).
- -export([content_types_provided/2]).
- -export([content_types_accepted/2]).
- -export([resource_exists/2]).
- %% Custom callbacks.
- -export([create_paste/2]).
- -export([paste_html/2]).
- -export([paste_text/2]).
- init(Req, Opts) ->
- {cowboy_rest, Req, Opts}.
- allowed_methods(Req, State) ->
- {[<<"GET">>, <<"POST">>], Req, State}.
- content_types_provided(Req, State) ->
- {[
- {{<<"text">>, <<"plain">>, []}, paste_text},
- {{<<"text">>, <<"html">>, []}, paste_html}
- ], Req, State}.
- content_types_accepted(Req, State) ->
- {[{{<<"application">>, <<"x-www-form-urlencoded">>, []}, create_paste}],
- Req, State}.
- resource_exists(Req, _State) ->
- case cowboy_req:binding(paste_id, Req) of
- undefined ->
- {true, Req, index};
- PasteID ->
- case valid_path(PasteID) and file_exists(PasteID) of
- true -> {true, Req, PasteID};
- false -> {false, Req, PasteID}
- end
- end.
- create_paste(Req, State) ->
- PasteID = new_paste_id(),
- {ok, [{<<"paste">>, Paste}], Req2} = cowboy_req:read_urlencoded_body(Req),
- ok = file:write_file(full_path(PasteID), Paste),
- case cowboy_req:method(Req2) of
- <<"POST">> ->
- {{true, <<$/, PasteID/binary>>}, Req2, State};
- _ ->
- {true, Req2, State}
- end.
- paste_html(Req, index) ->
- {read_file("index.html"), Req, index};
- paste_html(Req, Paste) ->
- #{lang := Lang} = cowboy_req:match_qs([{lang, [], plain}], Req),
- {format_html(Paste, Lang), Req, Paste}.
- paste_text(Req, index) ->
- {read_file("index.txt"), Req, index};
- paste_text(Req, Paste) ->
- #{lang := Lang} = cowboy_req:match_qs([{lang, [], plain}], Req),
- {format_text(Paste, Lang), Req, Paste}.
- % Private
- read_file(Name) ->
- {ok, Binary} = file:read_file(full_path(Name)),
- Binary.
- full_path(Name) ->
- filename:join([code:priv_dir(rest_pastebin), Name]).
- file_exists(Name) ->
- case file:read_file_info(full_path(Name)) of
- {ok, _Info} -> true;
- {error, _Reason} -> false
- end.
- valid_path(<<>>) -> true;
- valid_path(<<$., _T/binary>>) -> false;
- valid_path(<<$/, _T/binary>>) -> false;
- valid_path(<<_Char, T/binary>>) -> valid_path(T).
- new_paste_id() ->
- Initial = rand:uniform(62) - 1,
- new_paste_id(<<Initial>>, 7).
- new_paste_id(Bin, 0) ->
- Chars = <<"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890">>,
- << <<(binary_part(Chars, B, 1))/binary>> || <<B>> <= Bin >>;
- new_paste_id(Bin, Rem) ->
- Next = rand:uniform(62) - 1,
- new_paste_id(<<Bin/binary, Next>>, Rem - 1).
- format_html(Paste, plain) ->
- Text = escape_html_chars(read_file(Paste)),
- <<"<!DOCTYPE html><html>",
- "<head><title>paste</title></head>",
- "<body><pre><code>", Text/binary, "</code></pre></body></html>\n">>;
- format_html(Paste, Lang) ->
- highlight(full_path(Paste), Lang, "html").
- format_text(Paste, plain) ->
- read_file(Paste);
- format_text(Paste, Lang) ->
- highlight(full_path(Paste), Lang, "ansi").
- highlight(Path, Lang, Type) ->
- Path1 = binary_to_list(Path),
- Lang1 = binary_to_list(Lang),
- os:cmd(["highlight --syntax=", Lang1,
- " --doc-title=paste ",
- " --out-format=", Type,
- " --include-style ", Path1]).
- % Escape some HTML characters that might make a fuss
- escape_html_chars(Bin) ->
- << <<(escape_html_char(B))/binary>> || <<B>> <= Bin >>.
- escape_html_char($<) -> <<"<">>;
- escape_html_char($>) -> <<">">>;
- escape_html_char($&) -> <<"&">>;
- escape_html_char(C) -> <<C>>.
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