From e4361842fcdec369fbd4466f2528b2815f504ff9 Mon Sep 17 00:00:00 2001
From: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Date: Sun, 16 Dec 2012 19:10:38 +0200
Subject: initial version

---
 server.lua | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 server.lua

(limited to 'server.lua')

diff --git a/server.lua b/server.lua
new file mode 100644
index 0000000..11bfe55
--- /dev/null
+++ b/server.lua
@@ -0,0 +1,115 @@
+--[[
+Copyright (c) 2012 Kaarle Ritvanen
+See LICENSE file for license details
+--]]
+
+require 'acf'
+local isinstance = acf.object.isinstance
+
+require 'json'
+require 'stringy'
+
+
+local function handle(env, txn, path)
+   local method = env.REQUEST_METHOD
+   local data
+   if env.CONTENT_LENGTH then
+      data = json.decode(env.input:read(env.CONTENT_LENGTH))
+   end
+
+   local parent, name
+   if path ~= '/' then
+      parent = txn:search(acf.path.parent(path))
+      name = acf.path.name(path)
+   end
+
+   if method == 'GET' then
+      local obj = txn:search(path)
+      if obj == nil then return 404 end
+
+      local res
+
+      if isinstance(obj, acf.model.node.TreeNode) then
+	 local node = {}
+	 for _, k in ipairs(acf.model.node.members(obj)) do
+	    local v = obj[k]
+	    if isinstance(v, acf.model.node.TreeNode) then
+	       v = acf.model.node.path(v)
+	    end
+	    node[k] = v
+	 end
+	 res = {data=node, meta=acf.model.node.meta(obj)}
+
+      else res = {data=obj, meta=acf.model.node.mmeta(parent, name)} end
+
+      local function f() coroutine.yield(json.encode(res)) end
+      return 200, {['Content-Type']='application/json'}, coroutine.wrap(f)
+   end
+
+   if method == 'DELETE' then
+      parent[name] = nil
+
+   elseif method == 'PUT' then
+      parent[name] = data
+
+   -- TODO implement POST for invoking object-specific actions
+
+   else return 405 end
+
+   return 200
+end
+
+
+-- TODO implement transactions as threads or store their state in
+-- shared storage
+local last_id = 0
+local txns = {}
+
+
+return function(env)
+	  local method = env.REQUEST_METHOD
+	  local path = env.REQUEST_URI
+
+	  -- TODO login session management
+
+	  local txn_id = tonumber(env.HTTP_X_ACF_TRANSACTION_ID)
+	  local txn
+	  if txn_id then
+	     txn = txns[txn_id]
+	     if not txn then return 404 end
+	  else txn = acf.transaction.start() end
+
+	  if stringy.startswith(path, '/config/') then
+	     -- TODO catch and forward relevant errors to the client
+	     local code, hdr, body = handle(env,
+					    txn,
+					    string.sub(path, 8, -1))
+	     if not txn_id and method ~= 'GET' and code == 200 then
+		txn:commit()
+	     end
+	     return code, hdr, body
+	  end
+
+	  if path == '/' then
+	     if method == 'GET' then return 301, {['Location']='/browser/'} end
+
+	     if not ({DELETE=true, POST=true})[method] then
+		return 405
+	     end
+
+	     if txn_id then
+		if method == 'POST' then txn:commit() end
+		txns[txn_id] = nil
+		return 200
+	     end
+
+	     if method == 'DELETE' then return 405 end
+
+	     last_id = last_id + 1
+	     local txn_id = last_id
+	     txns[txn_id] = txn
+	     return 200, {['X-ACF-Transaction-ID']=txn_id}
+	  end
+
+	  return 404
+       end
-- 
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