[Feature] Add `rspamadm template` command

lualib/rspamadm/template.lua

@@ -0,0 +1,129 @@
+--[[
+Copyright (c) 2019, Vsevolod Stakhov <vsevolod@highsecure.ru>
+
+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.
+]]--
+
+local argparse = require "argparse"
+
+
+-- Define command line options
+local parser = argparse()
+    :name "rspamadm template"
+    :description "Apply jinja templates for strings/files"
+    :help_description_margin(30)
+parser:argument "file"
+      :description "File to process"
+      :argname "<file>"
+      :args "*"
+
+parser:flag "-n --no-vars"
+      :description "Don't add Rspamd internal variables"
+parser:option "-e --env"
+      :description "Load additional environment vars from specific file (name=value)"
+      :argname "<filename>"
+      :count "*"
+parser:option "-l --lua-env"
+      :description "Load additional environment vars from specific file (lua source)"
+      :argname "<filename>"
+      :count "*"
+parser:mutex(
+    parser:option "-s --suffix"
+          :description "Store files with the new suffix"
+          :argname "<suffix>",
+    parser:flag "-i --inplace"
+      :description "Replace input file(s)"
+)
+
+local lua_util = require "lua_util"
+
+local function set_env(opts, env)
+  if opts.env then
+    for _,fname in ipairs(opts.env) do
+      for kv in assert(io.open(fname)):lines() do
+        if not kv:match('%s*#.*') then
+          local k,v = kv:match('([^=%s]+)%s*=%s*(.+)')
+
+          if k and v then
+            env[k] = v
+          else
+            io.write(string.format('invalid env line in %s: %s\n', fname, kv))
+          end
+        end
+      end
+    end
+  end
+
+  if opts.lua_env then
+    for _,fname in ipairs(opts.env) do
+      local ret,res_or_err = pcall(loadfile(fname))
+
+      if not ret then
+        io.write(string.format('cannot load %s: %s\n', fname, res_or_err))
+      else
+        if type(res_or_err) == 'table' then
+          for k,v in pairs(res_or_err) do
+            env[k] = lua_util.deepcopy(v)
+          end
+        else
+          io.write(string.format('cannot load %s: not a table\n', fname))
+        end
+      end
+    end
+  end
+end
+
+local function read_file(file)
+  local content
+  if file == '-' then
+    content = io.read("*all")
+  else
+    local f = assert(io.open(file, "rb"))
+    content = f:read("*all")
+    f:close()
+  end
+  return content
+end
+
+local function handler(args)
+  local opts = parser:parse(args)
+  local env = {}
+  set_env(opts, env)
+
+  if not opts.file or #opts.file == 0 then opts.file = {'-'} end
+  for _,fname in ipairs(opts.file) do
+    local content = read_file(fname)
+    local res = lua_util.jinja_template(content, env, opts.no_vars)
+
+    if opts.inplace then
+      local nfile = string.format('%s.new', fname)
+      local out = assert(io.open(nfile, 'w'))
+      out:write(content)
+      out:close()
+      os.rename(nfile, fname)
+    elseif opts.suffix then
+      local nfile = string.format('%s.%s', opts.suffix)
+      local out = assert(io.open(nfile, 'w'))
+      out:write(content)
+      out:close()
+    else
+      io.write(res)
+    end
+  end
+end
+
+return {
+  handler = handler,
+  description = parser._description,
+  name = 'template'
+}