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171 lines (153 loc) · 4.94 KB
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Copy pathrestserver.lua
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171 lines (153 loc) · 4.94 KB
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local restserver = {}
local request = require("wsapi.request")
local response = require("wsapi.response")
local json = require("dkjson")
local unpack = unpack or table.unpack
local function add_resource(self, name, entries)
for _, entry in ipairs(entries) do
local path = ("/" .. name .. "/" .. entry.path):gsub("/+", "/"):gsub("/$", "")
entry.rest_path = path
entry.match_path = path:gsub("{[^:]*:([^}]*)}", "(%1)"):gsub("{[^}]*}", "([^/]+)") .. "$"
path = path:gsub("{[^:]*:([^}]*)}", "%1"):gsub("{[^}]*}", "[^/]+") .. "$"
local methods = self.config.paths[path]
if not methods then
methods = {}
self.config.paths[path] = methods
table.insert(self.config.path_list, path)
end
if methods[entry.method] then
error("A handler for method "..entry.method.." in path "..path.." is already defined.")
end
methods[entry.method] = entry
end
end
local function type_check(tbl, schema)
for k, s in pairs(schema) do
if not tbl[k] and not s.optional then
return nil, "missing field '"..k.."'"
elseif type(tbl[k]) ~= s.type then
return nil, "in field '"..k.."', expected type "..s.type..", got "..type(tbl[k])
elseif s.array and next(tbl[k]) and not tbl[k][1] then
return nil, "in field '"..k.."', expected an array"
end
end
return true
end
local function decode(data, mimetype, schema)
if mimetype == "application/json" then
local tbl = json.decode(data)
if schema then
local ok, err = type_check(tbl, schema)
if not ok then
return nil, err
end
end
return tbl
elseif mimetype == "text/plain" then
return data or ""
elseif not mimetype or mimetype == "*/*" then
return data or ""
else
error("Mimetype "..mimetype.." not supported.")
end
end
local function encode(data, mimetype, schema)
if mimetype == "application/json" then
if schema then
local ok, err = type_check(data, schema)
if not ok then
return nil, err
end
end
return json.encode(data)
elseif mimetype == "text/plain" then
return data or ""
elseif not mimetype then
return data or ""
else
error("Mimetype "..mimetype.." not supported.")
end
end
local function fail(code, msg)
local wres = response.new(code, { ["Content-Type"] = "text/plain" })
wres:write(tostring(code).." "..msg)
return wres:finish()
end
local function match_path(self, path_info)
for _, path in ipairs(self.config.path_list) do
if path_info:match(path) then
return self.config.paths[path]
end
end
end
local function wsapi_handler_with_self(self, wsapi_env)
local wreq = request.new(wsapi_env)
local methods = self.config.paths[wsapi_env.PATH_INFO] or match_path(self, wsapi_env.PATH_INFO)
local entry = methods and methods[wreq.method]
if not entry then
return fail(405, "Method Not Allowed")
end
local input, err
if wreq.method == "POST" then
input, err = decode(wreq.POST.post_data, entry.consumes, entry.input_schema)
elseif wreq.method == "GET" then
input = wreq.GET
elseif wreq.method == "DELETE" then
input = ""
else
error("Other methods not implemented yet.")
end
if not input then
return fail(400, "Bad Request - Your request fails schema validation: "..err)
end
local placeholder_matches = (entry.rest_path ~= entry.match_path) and { wsapi_env.PATH_INFO:match(entry.match_path) } or {}
local ok, res = pcall(entry.handler, input, unpack(placeholder_matches))
if not ok then
return fail(500, "Internal Server Error - Error in application: "..res)
end
if not res then
return fail(500, "Internal Server Error - Server failed to produce a response.")
end
local output, err = encode(res.config.entity, entry.produces, entry.output_schema)
if not output then
return fail(500, "Internal Server Error - Server built a response that fails schema validation: "..err)
end
local wres = response.new(res.config.status, { ["Content-Type"] = entry.produces or "text/plain" })
wres:write(output)
return wres:finish()
end
local function add_setter(self, var)
self[var] = function (self, val)
self.config[var] = val
return self
end
end
function restserver.new()
local server = {
config = {
paths = {},
path_list = {},
},
enable = function(self, plugin_name)
local mod = require(plugin_name)
mod.extend(self)
return self
end,
add_resource = add_resource,
}
add_setter(server, "host")
add_setter(server, "port")
server.wsapi_handler = function(wsapi_env)
return wsapi_handler_with_self(server, wsapi_env)
end
return server
end
function restserver.response()
local res = {
config = {},
}
add_setter(res, "status")
add_setter(res, "entity")
return res
end
return restserver