erlang-oauth

erlang-oauth

An Erlang OAuth 1.0 implementation. Includes functions for generating signatures (client side), verifying signatures (server side), and some convenience functions for making OAuth HTTP requests (client side).

Quick start (client usage)

$ make
...
$ erl -pa ebin -s crypto -s inets
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1> Consumer = {"key", "secret", hmac_sha1}.
...
2> RequestTokenURL = "http://term.ie/oauth/example/request_token.php".
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3> {ok, RequestTokenResponse} = oauth:get(RequestTokenURL, [], Consumer).
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4> RequestTokenParams = oauth:params_decode(RequestTokenResponse).
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5> RequestToken = oauth:token(RequestTokenParams).
...
6> RequestTokenSecret = oauth:token_secret(RequestTokenParams).
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7> AccessTokenURL = "http://term.ie/oauth/example/access_token.php".
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8> {ok, AccessTokenResponse} = oauth:get(AccessTokenURL, [], Consumer, RequestToken, RequestTokenSecret).
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9> AccessTokenParams = oauth:params_decode(AccessTokenResponse).
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10> AccessToken = oauth:token(AccessTokenParams).
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11> AccessTokenSecret = oauth:token_secret(AccessTokenParams).
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12> URL = "http://term.ie/oauth/example/echo_api.php".
...
13> {ok, Response} = oauth:get(URL, [{"hello", "world"}], Consumer, AccessToken, AccessTokenSecret).
...
14> oauth:params_decode(Response).
...

OAuth consumer representation

Consumers are represented using tuples:

{Key::string(), Secret::string(), plaintext}

{Key::string(), Secret::string(), hmac_sha1}

{Key::string(), RSAPrivateKeyPath::string(), rsa_sha1}  % client side

{Key::string(), RSACertificatePath::string(), rsa_sha1}  % server side

OAuth compatibility

This implementation should be compatible with the signature algorithms presented in RFC5849 - The OAuth 1.0 Protocol, and OAuth Core 1.0 Revision A. It is not intended to cover OAuth 2.0.

OTP compatibility

Erlang/OTP R14B or greater.

Rebar compatibility

This implementation should be fully compatible with rebar. Add erlang-oauth as a dependency to your rebar.config file like this:

{deps, [
  {oauth, ".*", {git, "https://github.com/tim/erlang-oauth.git"}}
]}.

Please consult the relevant rebar wiki page for more information.

Other notes

This is not a "plug and play" server implementation. In order to implement OAuth correctly as a provider you have more work to do: token storage, nonce and timestamp verification etc.

This is not a "bells and whistles" HTTP client. If you need fine grained control over your HTTP requests or you prefer to use something other than inets/httpc then you will need to assemble the requests yourself. Use oauth:sign/6 to generate a list of signed OAuth parameters, oauth:uri_params_encode/1 or oauth:header_params_encode/1 to encode the parameters, and then assemble the request using your HTTP client of choice.

The percent encoding/decoding implementations are based on ibrowse

Example client/server code: github.com/tim/erlang-oauth-examples