libravatarserv/README.md

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**libravatarserv** is a simple [libravatar](https://www.libravatar.org/) server.
It is intended to be used as a
[CGI](https://en.wikipedia.org/wiki/Common_Gateway_Interface) program.
Libravatar is a free service and an open specification for hosting profile
images tied to email or OpenID addresses.
## Features
* Avatar delivery based on email addresses
* Default avatar for unknown addresses
* MD5 hashes
* SHA256 hashes
* Variable image size (`s` or `size`)
* Default actions (`d` or `default`): 404, URL, mp/mm
The default behaviour for unknown users is to return a 404 error. If a default
image is put in the avatar directory, that is returned instead. The default
image can not be overriden by adding the parameter `d` or `default` to the URL.
Clients are asked to cache results for up to 1 day to reduce load. This can
apply to negative results as well.
The API is explained in greater detail at the
[Libravar wiki](https://wiki.libravatar.org/api/).
## Usage
Install nginx and
[fcgiwrap](https://www.nginx.com/resources/wiki/start/topics/examples/fcgiwrap/),
copy the [example config](https://schlomp.space/tastytea/libravatarserv/src/branch/master/doc/nginx-example.conf) to the nginx configuration directory and edit it
according to your needs. Other webservers and cgi spawners will also work, of
course.
Add the following DNS records to your nameserver:
```PLAIN
_avatars._tcp.example.com. IN SRV 0 0 80 avatars.example.com
_avatars-sec._tcp.example.com. IN SRV 0 0 443 avatars.example.com
```
`_avatars._tcp.example.com` is for HTTP, `_avatars-sec._tcp.example.com` is for
HTTPS.
libravatarserv looks in each of `${XDG_DATA_DIRS}` for a directory named
`libravatarserv`. You can force a different directory by setting the environment
variable `${LIBRAVATARSERV_DIR}` (until 0.3.0 `${AVATAR_DIR}`).
The image files are named like your email address, no file extension. If you
want to deliver a default image for unknown email addresses, name it `default`.
If you want to support "Mystery persons" (mp/mm) as default avatars, place a
file named `mp` in the avatar dir. You can use the [default libravatar mystery
person](https://seccdn.libravatar.org/mm/512.png), for example.
Test your setup on https://www.libravatar.org/tools/check/.
### Example
The avatar directory could look like this:
```PLAIN
/usr/share/libravatarserv
├── [ 32K] default
├── [ 759] user@example.com
└── [ 16] user+newsletter@example.com -> user@example.com
```
## Install
### Gentoo
Gentoo ebuilds are available via my
[repository](https://schlomp.space/tastytea/overlay).
### Automatically generated packages
Binary packages are generated automatically for each
[release](https://schlomp.space/tastytea/libravatarserv/releases) in the
formats:
* deb
* rpm
* tar.gz
They are generated on Ubuntu Trusty 64 bit.
### From source
#### Dependencies
* C++ compiler (tested: [gcc](https://gcc.gnu.org/) 5/6/7/8,
[clang](https://llvm.org/) 5/6)
* [cmake](https://cmake.org/) (at least 3.2)
* [crypto++](https://cryptopp.com) (tested: 7.0 / 5.6)
* [imagemagick](https://www.imagemagick.org/) (tested: 7.0 / 6.7)
* [libxdg-basedir](http://repo.or.cz/w/libxdg-basedir.git) (tested: 1.2)
#### Compile
```SH
mkdir build
cd build
cmake ..
make
make install
```
##### cmake options
* `-DCMAKE_BUILD_TYPE=Debug` for a debug build
* One of:
* `-DWITH_DEB=YES` to generate a deb-package
* `-DWITH_RPM=YES` to generate an rpm-package
To generate a binary package, execute `make package`
## Contributing
Contributions are always welcome. You can submit them as pull requests or via
email to `tastytea`@`tastytea.de`.
## Contact
See https://tastytea.de/
## License & Copyright
```PLAIN
Copyright © 2018 tastytea <tastytea@tastytea.de>.
License GPLv3: GNU GPL version 3 <https://www.gnu.org/licenses/gpl-3.0.html>.
This program comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
```