| % Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| % use this file except in compliance with the License. You may obtain a copy of |
| % the License at |
| % |
| % http://www.apache.org/licenses/LICENSE-2.0 |
| % |
| % Unless required by applicable law or agreed to in writing, software |
| % distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| % WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| % License for the specific language governing permissions and limitations under |
| % the License. |
| |
| -module(couch_epi_util). |
| |
| -export([module_version/1, hash/1, md5/1]). |
| |
| module_version(Module) -> |
| Attributes = Module:module_info(attributes), |
| {vsn, VSNs} = lists:keyfind(vsn, 1, Attributes), |
| VSNs. |
| |
| hash(Term) -> |
| <<SigInt:128/integer>> = md5(term_to_binary(Term)), |
| io_lib:format("\"~.36B\"",[SigInt]). |
| |
| md5(Data) -> |
| case erlang:function_exported(crypto, hash, 2) of |
| true -> |
| crypto:hash(md5, Data); |
| false -> |
| crypto:md5(Data) |
| end. |