This is a library for reading and writing licenses in the same format as [True License] tl for java. True License is written by Christian Schlichtherle and is an open source java library for generating and verifying licenses. My goals and approach were very different to the original library so True License and Truby License will share very little in how they work and are used: I don't know of a way to ship properly obfuscated code in Ruby to allow embedding passwords and keys in an installable, so this is not a way to license programs written in ruby. This is only created to allow me to generate True License files in a Ruby on Rails application, for use in verifying payment for a java-program. Truby License can read license files too, because I wrote that part to figure out how to write them, and I see no reason to throw it out: it is good to be able to inspect and verify a license too.

Because of its intended use being different this library takes a very simplified approach compared to True License.

It has a class TrubyLicense::LicenseData which is an instance of Struct with the following fields

• consumerType, a String
• notBefore, a Time
• notAfter, a Time
• extra, a String
• subject, a String
• holder, a String representing a "distinguished name" see rfc2253
• issued, a Time
• issuer, a String representing a "distinguished name" see rfc2253

These are the fields I use, so those are the ones I have implemented. I think True License has a few more but they were not present in the license files I was generating so they are not here. They should be straightforward to implement should you need to though. Any questions on the code are welcome, just comment on the commit where it was added (you can chose to "blame" a file to find out where a line was committed and comment there).

You instantiate the class TrubyLicense with the parameters password and key, a string and an OpenSSL::PKey::DSA respectively:

require "openssl"

key = OpenSSL::PKey::DSA.new(open('dsa.pem', "rb", &:read))

truby_license = TrubyLicense.new "my secret password", key

Then you can create the license data you want:

ld = TrubyLicense::LicenseData.new
ld.consumerType = "Computer"
ld.notBefore = Time.now
ld.notAfter = 6.months.from_now
ld.extra = {"custom" => "data"}.to_json
ld.subject = "Some subject"
ld.holder = "CN=Valued Customer"
ld.issued = Time.now
ld.issuer = "CN=Einar Boson"

and save the license to a file:

open("license.key", "wb"){ |io| io.write truby_license.serialize_license(ld) }

done. To read it back, you can do

ld_dup = truby_license.deserialize_license(open("license.key", "rb", &:read))

That's it. Please be aware that the LicenseData structure does not check the type of its members and that if they are wrong exceptions may be raised, or the format of the license may become invalid. I may add checks at some point, or you can do it if you need it :)

Copyright (C) 2011 Einar Magnús Boson

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.