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/**
@mainpage OAuth library functions
\image html libOAuth.png "libOAuth"
@section intro Introduction
liboauth is a collection of POSIX-c functions implementing the <a href="http://oauth.net/">OAuth</a> Core <a href="http://tools.ietf.org/html/rfc5849">RFC 5849</a> standard.
liboauth provides functions to escape and encode parameters according to OAuth specification and offers high-level functionality to sign requests or verify OAuth signatures as well as perform HTTP requests.
liboauth depends on either on the <a href="http://openssl.org/">OpenSSL</a> library or on
<a href="http://www.mozilla.org/projects/security/pki/nss/">NSS</a> (Mozilla's Network Security Services)
, which are used for generating the hash/signature, and optionally <a href="http://curl.haxx.se/libcurl/c/">libcurl</a> for issuing HTTP requests.
The source includes example code and a self-tests based on <a href="http://wiki.oauth.net/TestCases">http://wiki.oauth.net/TestCases</a>. The library has been tested against the http://oauth-sandbox.mediamatic.nl (now offline) and http://term.ie/oauth/example test servers using commandline-cURL, libcurl and a QT4.3.2 QHttp C++ application on win32 (mingw), gnu/Linux and Mac/OSX.
@section installation Installation
The source is debianized. On Debian systems <tt>debian-buildpackage</tt> can be used to compile and <tt>dpkg -i</tt> to install <em>liboauth</em> and <em>liboauth-dev</em> packages.
liboauth uses autotools and libtools. The tar.gz package includes the <tt>configure</tt> script, but if you get the source from the repository, you first need to generate the build environment with something alike:
<tt>aclocal; autoheader; libtoolize --copy; autoconf; automake --gnu --add-missing --copy</tt>. (<i>OSX users use <tt>glibtoolize</tt></i>).
run <tt>./configure</tt> and build liboauth with <tt>make</tt>. see the INSTALL file for further instructions on gnu autotools.
run <tt>./configure --help</tt> for information on optional features (<tt>--disable-curl</tt>, <tt>--disable-libcurl</tt>, <tt>--enable-nss</tt>, <tt>--with-curltimeout[=<int>]</tt>).
If <a href="http://www.stack.nl/~dimitri/doxygen/">Doxygen</a> is available, the documentation can be rendered from the source by calling <tt>make dox</tt>. The http://wiki.oauth.net/TestCases scenarios in the example code can be run with <tt>make check</tt>.
@section usage Usage
Consult \ref oauth.h for a detailed reference of available functions. This documentation is also available as unix manual page: <tt>man 3 oauth</tt>.
See <tt>tests/oauthtest.c</tt> for the self-test code and example. <tt>tests/oauthexample.c</tt> implements a simple hardcoded OAuth-consumer.
If you simply want to calculate the OAuth-signature, all you need is \ref oauth_sign_url.
Future releases might include more elaborate usage information: Feel free to ask questions.
<a href="http://rg42.org/oss/oauth/">oauth-utils</a> includes a command-line OAuth-consumer and signature-verification tool using liboauth.
@section download Download
Download Source: <a href="http://sourceforge.net/projects/liboauth/files/liboauth-@VERSION@.tar.gz/download">liboauth-@VERSION@.tar.gz</a>
<a href="http://liboauth.svn.sourceforge.net/viewvc/liboauth/trunk/ChangeLog?revision=HEAD&view=markup">Changelog</a>.
liboauth is maintained at sourceforge subversion repositories:
<a href="http://liboauth.svn.sourceforge.net/viewvc/liboauth/">Browse Web SVN</a> URL: <tt>https://liboauth.svn.sourceforge.net/svnroot/liboauth/</tt>, and mirrored at the <a href="http://oauth.googlecode.com/svn/code/c/liboauth/">OAuth googlecode repository</a>.
<!--
The development branch is available from <tt>git://rg42.org/liboauth</tt> or download a <a href="http://rg42.org/gitweb/?p=liboauth.git;a=snapshot;h=head">snapshot</a>.
!-->
@section bug Bugs
Send bug reports, patches or suggestions to robin @ gareus . org.
Ask the <a href="http://oauth.net/community/">oauth-community</a> or join the <a href="http://groups.google.com/group/oauth/">mailing list</a> for discussion.
@section license License
The source-code of liboauth can be distributed under <a href="http://www.opensource.org/licenses/mit-license.php">MIT License</a>,
or at your option in terms of the the <a href="http://www.gnu.org/licenses/old-licenses/gpl-2.0.html">GNU General Public License</a>.
Note: OpenSSL is not strictly compatible with the GPL license.
An exemption (to the GPL) allowing to link and redistribute liboauth with the OpenSSL library is is included in the source files.
More information is available in the
<a href="http://liboauth.svn.sourceforge.net/viewvc/liboauth/trunk/README?revision=HEAD&view=markup">README</a>.
You can avoid this whole issue by using NSS instead of OpenSSL, configuring liboauth with <tt>--enable-nss</tt>.
The Debian packaging that comes with the source-code is licensed under the GNU General Public License.
MIT License (source-code):
<pre>
Copyright 2007-2010 Robin Gareus
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.
</pre>
GPL (Debian packaging and alternative source-code license):
<pre>
This package is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This package is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public
License along with this package; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
</pre>
\example tests/oauthtest.c
\example tests/oauthtest2.c
\example tests/oauthexample.c
\example tests/oauthbodyhash.c
\example tests/selftest_wiki.c
*/
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