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--[[
Copyright (c) 2012-2013 Kaarle Ritvanen
See LICENSE file for license details
--]]
require 'acf'
local mnode = acf.model.node
local isinstance = acf.object.isinstance
require 'json'
require 'stringy'
math.randomseed(os.time())
-- TODO shared storage for sessions
-- TODO expire stale sessions
local sessions = {}
return function(env)
local method = env.REQUEST_METHOD
local path = env.REQUEST_URI
local function wrap(code, headers, res)
if not headers then headers = {} end
local ctype
if type(res) == 'table' then
ctype = 'application/json'
res = json.encode(res)
else
ctype = 'text/plain'
if not res then res = '' end
end
headers['Content-Type'] = ctype
return code, headers, coroutine.wrap(
function() coroutine.yield(res) end
)
end
local data
if env.CONTENT_LENGTH then
local success
success, data = pcall(
json.decode,
env.input:read(env.CONTENT_LENGTH)
)
if not success then
return wrap(400, nil, 'Request not in JSON format')
end
end
local sid = tonumber(env.HTTP_X_ACF_AUTH_TOKEN)
local session, user, txn_id
if sid then
session = sessions[sid]
if not session then return wrap(401) end
user = session.user
txn_id = tonumber(env.HTTP_X_ACF_TRANSACTION_ID)
end
local parent_txn
if txn_id then
parent_txn = session.txns[txn_id]
if not parent_txn then
return wrap(400, nil, 'Invalid transaction ID')
end
end
local txn = acf.transaction.start(parent_txn, true)
local function fetch_user(name)
user = name and txn:search('/auth/users')[name]
end
if user then
fetch_user(user)
if not user then return wrap(401) end
end
if path == '/login' then
if method == 'POST' then
if not data.username or not data.password then
return wrap(401)
end
fetch_user(data.username)
if user and user:check_password(data.password) then
local sid
repeat
sid = math.floor(math.random() * 2^32)
until not sessions[sid]
sessions[sid] = {user=data.username, last_txn_id=0, txns={}}
return wrap(204, {['X-ACF-Auth-Token']=sid})
end
return wrap(401)
end
if not user then return wrap(401) end
if method == 'DELETE' then
sessions[sid] = nil
return wrap(204)
end
return wrap(405)
end
if not user then return wrap(401) end
local success, code, hdr, res = acf.call(
function()
if stringy.startswith(path, '/config/') then
path = string.sub(path, 8, -1)
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)
local res
if isinstance(obj, mnode.TreeNode) then
if not mnode.has_permission(obj, user, 'read') then
return 403
end
local node = {}
for k, v in mnode.pairs(obj) do
local readable = true
if isinstance(v, mnode.TreeNode) then
readable = mnode.has_permission(
v,
user,
'read'
)
v = mnode.path(v)
end
if readable then node[k] = v end
end
res = {data=node, meta=mnode.meta(obj)}
elseif mnode.has_permission(parent, user, 'read') then
res = {data=obj, meta=mnode.mmeta(parent, name)}
else return 403 end
return 200, nil, res
end
if method == 'POST' then
local obj = txn:search(path)
if not acf.object.isinstance(obj, acf.model.set.Set) then
-- TODO invoke model-specific actions
return 405
end
if not mnode.has_permission(obj, user, 'create') then
return 403
end
acf.model.set.add(obj, data)
else
local obj = parent[name]
if obj ~= nil and not isinstance(obj, mnode.TreeNode) then
obj = parent
end
if method == 'DELETE' then
if obj == nil then return 404 end
if not mnode.has_permission(obj, user, 'delete') then
return 403
end
parent[name] = nil
elseif method == 'PUT' then
local permission = 'modify'
if obj == nil then
obj = parent
permission = 'create'
end
if not mnode.has_permission(obj, user, permission) then
return 403
end
parent[name] = data
else return 405 end
end
txn:commit()
return 205
end
if path == '/' then
if method == 'GET' then
return 301, {['Location']='/browser/'}
end
if ({DELETE=true, PUT=true})[method] then
if not txn_id then return 405 end
if method == 'PUT' then parent_txn:commit() end
session.txns[txn_id] = nil
return 204
end
if method ~= 'POST' then return 405 end
session.last_txn_id = session.last_txn_id + 1
local txn_id = session.last_txn_id
session.txns[txn_id] = acf.transaction.start(parent_txn)
return 204, {['X-ACF-Transaction-ID']=txn_id}
end
return 404
end
)
if success then return wrap(code, hdr, res) end
if code.conflict then return wrap(409, nil, code.conflict) end
return wrap(422, nil, code)
end
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