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repost_twitter.erl
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repost_twitter.erl
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%%%=============================================================================
%%% @doc Repost an entry to Twitter
%%%
%%% @author Dmitrii 'Mamut' Dimandt <dmitrii@dmitriid.com>
%%% @copyright 2012 Dmitrii 'Mamut' Dimandt
%%%
%%% @end
%%%=============================================================================
-module(repost_twitter).
-export([repost_function/2]).
-define(CONTENT_TYPE, "application/x-www-form-urlencoded").
-define(TWITTER_URL,
"http://api.twitter.com/1/statuses/update.json?include_entities=true").
%%
%% @doc config should contain the following fields:
%% oauth_consumer_key
%% oauth_token
%% You can obtain these here:
%% https://dev.twitter.com/docs/auth/obtaining-access-tokens
%% The easiest way would be to crate an app for that, see
%% https://dev.twitter.com/apps
%% Auth is described in detail here:
%% https://dev.twitter.com/docs/auth/authorizing-request
%%
repost_function(Config, _Context) ->
Fun = fun(EntryId, Ctxt) ->
repost(Config, EntryId, Ctxt)
end,
Fun.
%%
%% @doc https://dev.twitter.com/docs/auth/authorizing-request
%% https://dev.twitter.com/docs/api/1/post/statuses/update
%%
%% For now, we let Twitter shorten links itself (20-25 characters)
%% We only deal with titles and summaries, since this way we don't
%% have to clean up links and media from entry body
%%
repost(Config, EntryId, Context) ->
ConsumerKey = proplists:get_value(oauth_consumer_key, Config),
ConsumerSecret = proplists:get_value(oauth_consumer_secret, Config),
Token = proplists:get_value(oauth_token, Config),
TokenSecret = proplists:get_value(oauth_token_secret, Config),
Body0 = m_rsc:p(EntryId, summary, Context),
Body = get_text(Body0, Context),
Title0 = m_rsc:p(EntryId, title, Context),
Title = get_text(Title0, Context),
Url = get_url(EntryId, Context),
PostBody = lists:flatten(get_post_body(Title, Body) ++ Url),
Nonce = generate_nonce(EntryId),
SignatureMethod = "HMAC-SHA1",
TimeStamp = z_convert:to_list(
z_datetime:datetime_to_timestamp(
calendar:local_time()) + 3600),
Version = "1.0",
RequestParams = prepare_params([ {"status", PostBody}
, {"include_entities", "true"}
, {"oauth_consumer_key", ConsumerKey}
, {"oauth_nonce", Nonce}
, {"oauth_signature_method", SignatureMethod}
, {"oauth_timestamp", TimeStamp}
, {"oauth_token", Token}
, {"oauth_version", Version}]),
Signature = generate_signature(RequestParams, ConsumerSecret, TokenSecret),
AuthHeader =
generate_auth_header( ConsumerKey, Token, Nonce, SignatureMethod, Signature
, TimeStamp, Version),
io:format("~p", [AuthHeader]),
Payload = list_to_binary(["status=", encode(PostBody)]),
Res = httpc:request( post % method()
, { ?TWITTER_URL % request() = { url
, [{"Authorization", AuthHeader}] % , headers
, ?CONTENT_TYPE % , content-type
, Payload} % , body }
, [] % http_options()
, []), % options()
io:format("~p", [Res]).
get_post_body(Title, Body) ->
z_string:truncate([Title | Body], 114). %% 140 - 25 for link - 1 for ... char
generate_nonce(EntryId) ->
{{Year, Month, Day},{Hour, Minute, Sec}} =
calendar:now_to_universal_time(now()),
Nonce = io_lib:format( "~p~p~p~p~p~p~p"
, [Year, Month, Day, Hour, Minute, Sec, EntryId]),
lists:flatten(Nonce).
generate_signature(Params, ConsumerSecret, TokenSecret) ->
SignatureString = lists:flatten([ "POST&"
, encode("https://api.twitter.com/1/statuses/update.json")
, "&"
, encode(Params)]),
SigningKey = lists:flatten([ encode(ConsumerSecret)
, "&"
, encode(TokenSecret)
]),
Sha = crypto:sha_mac(SigningKey, SignatureString),
binary_to_list(base64:encode(crypto:sha_mac(SigningKey, SignatureString))).
prepare_params(Params) ->
prepare_params(Params, []).
prepare_params([], Acc) ->
Ordlist = orddict:from_list(Acc),
params_to_string(Ordlist);
prepare_params([{Key, Value} | T], Acc) ->
Acc1 = [{encode(Key), encode(Value)} | Acc],
prepare_params(T, Acc1).
params_to_string(Ordlist) ->
KeyValueList =
[lists:flatten([Key, "=", Value]) || {Key, Value} <- Ordlist],
string:join(KeyValueList, "&").
generate_auth_header( ConsumerKey, Token, Nonce, SignatureMethod, Signature
, TimeStamp, Version) ->
lists:flatten([ "OAuth "
, "oauth_consumer_key=\"", encode(ConsumerKey), "\", "
, "oauth_nonce\"", encode(Nonce), "\", "
, "oauth_signature=\"", encode(Signature), "\", "
, "oauth_signature_method=\"", encode(SignatureMethod), "\", "
, "oauth_timestamp=\"", encode(TimeStamp), "\", "
, "oauth_token=\"", encode(Token), "\", "
, "oauth_version=\"", encode(Version), "\""]).
get_text({trans, List}, Context) ->
Language = z_context:language(Context),
Text = proplists:get_value(Language, List, proplists:get_value(en, List, "")),
TextWithMedia = filter_show_media:show_media(Text, Context),
process_text(lists:flatten(z_convert:to_list(TextWithMedia))).
process_text(Text) ->
lists:flatten(process_text(Text, [])).
process_text([], Acc) ->
Acc;
process_text([H|T], Acc) when is_binary(H) ->
process_text(T, [Acc | binary_to_list(H)]);
process_text([H|T], Acc) ->
process_text(T, [Acc | [H]]).
get_url(EntryId, Context) ->
z_context:abs_url( z_convert:to_binary(m_rsc:p(EntryId, page_url, Context))
, Context).
%% Percent encode
%% https://github.com/tim/erlang-percent-encoding/blob/master/src/oauth_uri.erl
%%
-define(is_uppercase_alpha(C), C >= $A, C =< $Z).
-define(is_lowercase_alpha(C), C >= $a, C =< $z).
-define(is_alpha(C), ?is_uppercase_alpha(C); ?is_lowercase_alpha(C)).
-define(is_digit(C), C >= $0, C =< $9).
-define(is_alphanumeric(C), ?is_alpha(C); ?is_digit(C)).
-define(is_unreserved(C), ?is_alphanumeric(C); C =:= $-; C =:= $_; C =:= $.; C =:= $~).
encode(Chars) ->
encode(Chars, []).
encode([], Encoded) ->
lists:flatten(lists:reverse(Encoded));
encode([C|Etc], Encoded) when ?is_unreserved(C) ->
encode(Etc, [C|Encoded]);
encode([C|Etc], Encoded) ->
Value = [io_lib:format("%~s", [z_utils:encode([Char], 16)])
|| Char <- binary_to_list(unicode:characters_to_binary([C]))],
encode(Etc, [lists:flatten(Value)|Encoded]).