OPA for HTTP Authorization

Open Policy Agent[1] is a promising, light weight and very generic policy engine to govern authorization is any type of domain. I found this comparion[2] very attractive in evaluating OPA for a project I am currently working on, where they demonstrate how OPA can cater same functionality defined in RBAC, RBAC with Seperation of Duty, ABAC and XACML.  
Here are the steps to a brief demonstration of OPA used for HTTP API authorization based on the sample [3], taking it another level up.
Running OPA Server First we need to download OPA from [4], based on the operating system we are running on.  For linux, curl -L -o opa https://github.com/open-policy-agent/opa/releases/download/v0.10.3/opa_linux_amd64 Make it executable, chmod 755 ./opa Once done, we can start OPA policy engine as a server.
./opa run --server Define Data and Rules Next we need to load data and authorization rules to the server, so it can make decisions. OPA defines these in files in the format of .rego. Below is a sample …

Useful Commands to Deal with SVN

The commands I came across with, while working with svn in Linux.
  • Find and remove all the .svn folders inside a folder - This is useful when we have checkout the code from a svn repo and want to remove it from version control.
find . -name .svn | xargs rm -rf
  • Add a new folder to version control - When we have a folder that is already under version control and want to add a new one inside it.
svn add
  • Commit the made changes
svn ci -m "a useful message about the commit"
  • Remove some specific folders like target and IDE specific data from version control, but keep the data in our local machine.
svn delete --keep-local <file name> 
  • Check out a particular revision of from SVN when we know the revision number 
svn co -r <revision no.> <path for the checking out folder or file>
  • Save the difference of code to a file
svn diff > <filepath> 

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