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17 changes: 15 additions & 2 deletions .gitignore
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ebin
deps
.rebar3
_*
.eunit
*.o
*.beam
*.plt
*.swp
*.swo
.erlang.cookie
ebin
log
erl_crash.dump
.rebar
logs
_build
.idea
18 changes: 18 additions & 0 deletions .travis.yml
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sudo: false
language: erlang
install: true
before_script:
- wget https://s3.amazonaws.com/rebar3/rebar3
- chmod +x rebar3
env: PATH=$PATH:.
cache:
directories:
- $HOME/.cache/rebar3/
otp_release:
- 19.3
- 19.0
- 18.3
- 18.0
script:
- rebar3 as test do xref, dialyzer, eunit
- rebar3 as test coveralls send
22 changes: 22 additions & 0 deletions LICENSE
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MIT License

Copyright (c) 2013 Martin Rehfeld
Copyright (c) 2018 elli-lib team

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
100 changes: 64 additions & 36 deletions README.md
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# Basic Authentication Middleware for Elli
# elli_basicauth

Use it together with the [Elli webserver](https://github.com/knutin/elli)
like this:
*Basic authentication middleware for [elli][]*

[![Hex.pm][hex badge]][hex package]
[![Erlang][erlang badge]][erlang downloads]
[![Travis CI][travis badge]][travis builds]
[![Coverage Status][coveralls badge]][coveralls link]

[elli]: https://github.com/elli-lib/elli
[hex badge]: https://img.shields.io/hexpm/v/elli_basicauth.svg
[hex package]: https://hex.pm/packages/elli_basicauth
[erlang badge]: https://img.shields.io/badge/erlang-%E2%89%A518.0-red.svg
[erlang downloads]: http://www.erlang.org/downloads
[travis builds]: https://travis-ci.org/elli-lib/elli_basicauth
[travis badge]: https://travis-ci.org/elli-lib/elli_basicauth.svg
[coveralls badge]: https://coveralls.io/repos/github/elli-lib/elli_basicauth/badge.svg?branch=develop
[coveralls link]: https://coveralls.io/github/elli-lib/elli_basicauth?branch=develop
[license badge]: https://img.shields.io/hexpm/l/elli_basicauth.svg


## Installation

```erlang
-module(my_elli_stuff).
-export([start_link/0, auth_fun/3]).

start_link() ->
BasicauthConfig = [
{auth_fun, fun my_elli_stuff:auth_fun/3},
{auth_realm, <<"Admin Area">>} % optional
],

Config = [
{mods, [
{elli_basicauth, BasicauthConfig},
{elli_example_callback, []}
]}
],

elli:start_link([{callback, elli_middleware},
{callback_args, Config}]).


auth_fun(Req, User, Password) ->
case elli_request:path(Req) of
[<<"protected">>] -> password_check(User, Password);
_ -> ok
end.


password_check(User, Password) ->
case {User, Password} of
{undefined, undefined} -> unauthorized;
{<<"admin">>, <<"secret">>} -> ok;
{User, Password} -> forbidden
end.
{deps, [
{elli, "2.0.2"},
{elli_basicauth, "0.1.0"}
]}.
```


## Example

- Start an Erlang shell with elli and elli_basicauth loaded.

```fish
rebar3 as test shell
```

- Start [elli_basicauth_example](./test/elli_basicauth_example.erl).

```erlang
1> {ok, Pid} = elli_basicauth_example:start_link().
```

- Make requests, e.g. using [HTTPie](https://httpie.org/).
```fish
http :8080/protected
```
```http
HTTP/1.1 401 Unauthorized
Connection: Keep-Alive
Content-Length: 12
WWW-Authenticate: Basic realm="Admin Area"
Unauthorized
```

```fish
http -a user:pass :8080/protected
```
```http
HTTP/1.1 403 Forbidden
Connection: Keep-Alive
Content-Length: 9
Forbidden
```
11 changes: 11 additions & 0 deletions doc/README.md
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# The elli_basicauth application #


## Modules ##


<table width="100%" border="0" summary="list of modules">
<tr><td><a href="elli_basicauth.md" class="module">elli_basicauth</a></td></tr></table>

3 changes: 3 additions & 0 deletions doc/edoc-info
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%% encoding: UTF-8
{application,elli_basicauth}.
{modules,[elli_basicauth]}.
129 changes: 129 additions & 0 deletions doc/elli_basicauth.md
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# Module elli_basicauth #
* [Description](#description)
* [Data Types](#types)
* [Function Index](#index)
* [Function Details](#functions)

Elli basicauth middleware.

Copyright (c) 2013, Martin Rehfeld; 2018, elli-lib team

This middleware provides basic authentication to protect
requests, based on a user-configured authentication function.

__Behaviours:__ [`elli_handler`](https://github.com/elli-lib/elli/blob/develop/doc/elli_handler.md).

__Authors:__ Martin Rehfeld, Eric Bailey.

<a name="types"></a>

## Data Types ##




### <a name="type-auth_fun">auth_fun()</a> ###


__abstract datatype__: `auth_fun()`

A user-configurable authentication function.



### <a name="type-auth_status">auth_status()</a> ###


__abstract datatype__: `auth_status()`

The result of an <code><a href="#type-auth_fun">auth_fun()</a></code>.



### <a name="type-config">config()</a> ###


__abstract datatype__: `config()`

A property list of options.
The configurable options are:



<dt><code>auth_fun</code></dt>




<dd>An <code><a href="#type-auth_fun">auth_fun()</a></code></dd>




<dt><code>auth_realm</code></dt>




<dd>A binary <a href="https://tools.ietf.org.md/rfc1945#section-11">realm</a>.</dd>





### <a name="type-credentials">credentials()</a> ###


<pre><code>
credentials() = {undefined, undefined} | {Username::binary(), Password::binary()}
</code></pre>

<a name="index"></a>

## Function Index ##


<table width="100%" border="1" cellspacing="0" cellpadding="2" summary="function index"><tr><td valign="top"><a href="#default_auth_fun-2">default_auth_fun/2</a></td><td>Default to <code>forbidden</code>, in case of missing <code>auth_fun</code> config.</td></tr><tr><td valign="top"><a href="#handle-2">handle/2</a></td><td>Protect <code>Req</code> based on the configured <code>auth_fun</code>.</td></tr><tr><td valign="top"><a href="#handle_event-3">handle_event/3</a></td><td>No-op to satisfy the <code>elli_handler</code> behaviour.</td></tr></table>


<a name="functions"></a>

## Function Details ##

<a name="default_auth_fun-2"></a>

### default_auth_fun/2 ###

<pre><code>
default_auth_fun(Req, Credentials) -&gt; AuthStatus
</code></pre>

<ul class="definitions"><li><code>Req = <a href="http://raw.github.com/elli-lib/elli/develop/doc/elli.md#type-req">elli:req()</a></code></li><li><code>Credentials = <a href="#type-credentials">credentials()</a></code></li><li><code>AuthStatus = <a href="#type-auth_status">auth_status()</a></code></li></ul>

Default to `forbidden`, in case of missing `auth_fun` config.

<a name="handle-2"></a>

### handle/2 ###

<pre><code>
handle(Req::<a href="http://raw.github.com/elli-lib/elli/develop/doc/elli.md#type-req">elli:req()</a>, Config::<a href="#type-config">config()</a>) -&gt; <a href="http://raw.github.com/elli-lib/elli/develop/doc/elli_handler.md#type-result">elli_handler:result()</a>
</code></pre>
<br />

Protect `Req` based on the configured `auth_fun`.
If none is given, the default authentication is `forbidden`.

<a name="handle_event-3"></a>

### handle_event/3 ###

<pre><code>
handle_event(Event::<a href="http://raw.github.com/elli-lib/elli/develop/doc/elli_handler.md#type-event">elli_handler:event()</a>, Args::list(), Config::<a href="#type-config">config()</a>) -&gt; ok
</code></pre>
<br />

No-op to satisfy the `elli_handler` behaviour. Return `ok`.

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55 changes: 55 additions & 0 deletions doc/stylesheet.css
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/* standard EDoc style sheet */
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
margin-left: .25in;
margin-right: .2in;
margin-top: 0.2in;
margin-bottom: 0.2in;
color: #000000;
background-color: #ffffff;
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margin-left: -0.2in;
}
div.navbar {
background-color: #add8e6;
padding: 0.2em;
}
h2.indextitle {
padding: 0.4em;
background-color: #add8e6;
}
h3.function,h3.typedecl {
background-color: #add8e6;
padding-left: 1em;
}
div.spec {
margin-left: 2em;
background-color: #eeeeee;
}
a.module {
text-decoration:none
}
a.module:hover {
background-color: #eeeeee;
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list-style-type: none;
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list-style-type: none;
background-color: #eeeeee;
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/*
* Minor style tweaks
*/
ul {
list-style-type: square;
}
table {
border-collapse: collapse;
}
td {
padding: 3
}
22 changes: 22 additions & 0 deletions elvis.config
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[
{
elvis,
[
{config,
[#{dirs => ["src"],
filter => "*.erl",
ruleset => erl_files
},
#{dirs => ["."],
filter => "rebar.config",
ruleset => rebar_config
},
#{dirs => ["."],
filter => "elvis.config",
ruleset => elvis_config
}
]
}
]
}
].

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