1 files changed, 107 insertions, 0 deletions
diff --git a/apps/oauth/src/oauth.erl b/apps/oauth/src/oauth.erl
new file mode 100644
index 00000000..866655c9
--- /dev/null
+++ b/apps/oauth/src/oauth.erl
@@ -0,0 +1,107 @@
+-module(oauth).
+
+-export(
+  [ get/5
+  , header/1
+  , post/5
+  , signature/5
+  , signature_base_string/3
+  , signed_params/6
+  , token/1
+  , token_secret/1
+  , uri/2
+  , verify/6
+  ]).
+
+
+get(URL, ExtraParams, Consumer, Token, TokenSecret) ->
+  SignedParams = signed_params("GET", URL, ExtraParams, Consumer, Token, TokenSecret),
+  oauth_http:get(uri(URL, SignedParams)).
+
+post(URL, ExtraParams, Consumer, Token, TokenSecret) ->
+  SignedParams = signed_params("POST", URL, ExtraParams, Consumer, Token, TokenSecret),
+  oauth_http:post(URL, oauth_uri:params_to_string(SignedParams)).
+
+uri(Base, []) ->
+  Base;
+uri(Base, Params) ->
+  lists:concat([Base, "?", oauth_uri:params_to_string(Params)]).
+
+header(Params) ->
+  {"Authorization", "OAuth " ++ oauth_uri:params_to_header_string(Params)}.
+
+token(Params) ->
+  proplists:get_value("oauth_token", Params).
+
+token_secret(Params) ->
+  proplists:get_value("oauth_token_secret", Params).
+
+verify(Signature, HttpMethod, URL, Params, Consumer, TokenSecret) ->
+  case signature_method(Consumer) of
+    plaintext ->
+      oauth_plaintext:verify(Signature, consumer_secret(Consumer), TokenSecret);
+    hmac_sha1 ->
+      BaseString = signature_base_string(HttpMethod, URL, Params),
+      oauth_hmac_sha1:verify(Signature, BaseString, consumer_secret(Consumer), TokenSecret);
+    rsa_sha1 ->
+      BaseString = signature_base_string(HttpMethod, URL, Params),
+      oauth_rsa_sha1:verify(Signature, BaseString, consumer_secret(Consumer))
+  end.
+
+signed_params(HttpMethod, URL, ExtraParams, Consumer, Token, TokenSecret) ->
+  Params = token_param(Token, params(Consumer, ExtraParams)),
+  [{"oauth_signature", signature(HttpMethod, URL, Params, Consumer, TokenSecret)}|Params].
+
+signature(HttpMethod, URL, Params, Consumer, TokenSecret) ->
+  case signature_method(Consumer) of
+    plaintext ->
+      oauth_plaintext:signature(consumer_secret(Consumer), TokenSecret);
+    hmac_sha1 ->
+      BaseString = signature_base_string(HttpMethod, URL, Params),
+      oauth_hmac_sha1:signature(BaseString, consumer_secret(Consumer), TokenSecret);
+    rsa_sha1 ->
+      BaseString = signature_base_string(HttpMethod, URL, Params),
+      oauth_rsa_sha1:signature(BaseString, consumer_secret(Consumer))
+  end.
+
+signature_base_string(HttpMethod, URL, Params) ->
+  NormalizedURL = oauth_uri:normalize(URL),
+  NormalizedParams = oauth_uri:params_to_string(lists:sort(Params)),
+  oauth_uri:calate("&", [HttpMethod, NormalizedURL, NormalizedParams]).
+
+token_param("", Params) ->
+  Params;
+token_param(Token, Params) ->
+  [{"oauth_token", Token}|Params].
+
+params(Consumer, Params) ->
+  Nonce = base64:encode_to_string(crypto:rand_bytes(32)), % cf. ruby-oauth
+  params(Consumer, oauth_unix:timestamp(), Nonce, Params).
+
+params(Consumer, Timestamp, Nonce, Params) ->
+  [ {"oauth_version", "1.0"}
+  , {"oauth_nonce", Nonce}
+  , {"oauth_timestamp", integer_to_list(Timestamp)}
+  , {"oauth_signature_method", signature_method_string(Consumer)}
+  , {"oauth_consumer_key", consumer_key(Consumer)}
+  | Params
+  ].
+
+signature_method_string(Consumer) ->
+  case signature_method(Consumer) of
+    plaintext ->
+      "PLAINTEXT";
+    hmac_sha1 ->
+      "HMAC-SHA1";
+    rsa_sha1 ->
+      "RSA-SHA1"
+  end.
+
+signature_method(_Consumer={_, _, Method}) ->
+  Method.
+
+consumer_secret(_Consumer={_, Secret, _}) ->
+  Secret.
+
+consumer_key(_Consumer={Key, _, _}) ->
+  Key.