commit 687d174eb525fb1f87e1f9b262704f48babf89a3
Author: Christoffer Müller Madsen <christoffer.m.madsen@thedevcave.net>
Date:   Fri May 26 23:10:41 2017 +0200

    humble beginnings

diff --git a/collab.rb b/collab.rb
new file mode 100644
index 0000000..fe151e2
--- /dev/null
+++ b/collab.rb
@@ -0,0 +1,73 @@
+require 'fileutils'
+
+POSIX_NAME_PREFIX = "emacs"
+
+
+$user_count = 0
+$users = []
+$id_map = {}
+
+
+## User manipulation
+
+class User
+  attr_accessor :id, :path, :posixname
+
+  def to_s
+    "#{@id}, #{@path}"
+  end
+end
+
+def get_user(id)
+  $id_map[id]
+end
+
+def add_user(id)
+  if not system("useradd -m #{POSIX_NAME_PREFIX}#{id}") then
+    raise "User creation failed"
+  end
+  
+  user = User.new
+  user.id = id
+  user.path = "/home/#{POSIX_NAME_PREFIX}#{id}"
+  user.posixname = "#{POSIX_NAME_PREFIX}#{id}"
+  $user_count += 1
+  $users << user
+  $id_map[id] = user
+
+  FileUtils.mkdir "#{user.path}/.ssh"
+  FileUtils.touch "#{user.path}/.ssh/authorized_keys"
+  FileUtils.chown_R user.id, user.id, "#{user.path}/.ssh"
+  
+  user
+end
+
+def remove_user(id)
+  system("userdel -r #{POSIX_NAME_PREFIX}#{id}")
+  $user_count -= 1
+end
+
+## Key manipulation
+
+class SSHKey
+  attr_accessor :cipher, :pubkey, :comment
+
+  def initialize(cipher,pubkey,comment="")
+    @cipher  = cipher
+    @pubkey  = pubkey
+    @comment = comment
+  end
+end
+
+def get_ssh_keys(id)
+  user = get_user(id)
+  extract_ssh_keys("#{user.path}/.ssh/authorized_keys").each do |k|
+    puts k.comment
+  end
+end
+
+def extract_ssh_keys(file)
+  File.open(file,"r") do |f|
+    f.read.split("\n").select{ |line| line[0..2] == "ssh" }.map{ |ks| k = ks.split(" "); SSHKey.new(k[0][4..6], k[1], k[2]) }
+  end
+end