Repository navigation
Expand file tree
/
Copy pathrestserver.lua
More file actions
171 lines (153 loc) · 4.94 KB
/
Copy pathrestserver.lua
File metadata and controls
171 lines (153 loc) · 4.94 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
<
8000
div data-line-number="36" class="react-line-number react-code-text" style="padding-right:16px">3637
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
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