iGeeky commented on a change in pull request #1095: feature: Add wolf rbac plugin URL: https://github.com/apache/incubator-apisix/pull/1095#discussion_r373767092
########## File path: lua/apisix/plugins/wolf-rbac.lua ########## @@ -0,0 +1,380 @@ + +local core = require("apisix.core") +local ck = require("resty.cookie") +local consumer = require("apisix.consumer") +local json = require("apisix.core.json") +local ngx_re = require("ngx.re") +local cjson = require("cjson") +local http = require("resty.http") +local ipairs = ipairs +local ngx = ngx +local ngx_time = ngx.time +local plugin_name = "wolf-rbac" + + +local schema = { + type = "object", + properties = { + appid = {type = "string"}, + server = { type = 'string'}, + } +} + + +local _M = { + version = 0.1, + priority = 2555, + type = 'auth', + name = plugin_name, + schema = schema, +} + + +local create_consume_cache +do + local consumer_ids = {} + + function create_consume_cache(consumers) + core.table.clear(consumer_ids) + + for _, consumer in ipairs(consumers.nodes) do + core.log.info("consumer node: ", core.json.delay_encode(consumer)) + consumer_ids[consumer.auth_conf.appid] = consumer + end + + return consumer_ids + end + +end -- do + +local token_version = 'V1' +local function create_rbac_token(appid, wolf_token) + return token_version .. "#" .. appid .. "#" .. wolf_token +end + +local function parse_rbac_token(rbac_token) + local res, err = ngx_re.split(rbac_token, "#", nil, nil, 3) + if not res then + return { err=err} + end + + if res[1] ~= token_version then + return { err='invalid rbac token: version'} + end + local appid = res[2] + local wolf_token = res[3] + + return {appid = appid, wolf_token = wolf_token} +end + +local function new_headers() + local t = {} + local lt = {} + local _mt = { + __index = function(t, k) + return rawget(lt, string.lower(k)) + end, + __newindex = function(t, k, v) + rawset(t, k, v) + rawset(lt, string.lower(k), v) + end, + } + return setmetatable(t, _mt) +end + +-- timeout in ms +local function http_req(method, uri, body, myheaders, timeout) + if myheaders == nil then myheaders = new_headers() end + + local httpc = http.new() + if timeout then + httpc:set_timeout(timeout) + end + + local params = {method = method, headers = myheaders, body=body, ssl_verify=false} + local res, err = httpc:request_uri(uri, params) + if err then + core.log.error("FAIL REQUEST [ ",core.json.delay_encode({method=method, uri=uri, body=body, headers=myheaders}), " ] failed! res is nil, err:", err) + return nil, err + end + + return res +end + +local function http_get(uri, myheaders, timeout) + return http_req("GET", uri, nil, myheaders, timeout) +end + +local function http_post(uri, body, myheaders, timeout) + return http_req("POST", uri, body, myheaders, timeout) +end + +local function http_put(uri, body, myheaders, timeout) + return http_req("PUT", uri, body, myheaders, timeout) +end + +function _M.check_schema(conf) + core.log.info("input conf: ", core.json.delay_encode(conf)) + + local ok, err = core.schema.check(schema, conf) + if not ok then + return false, err + end + + if not conf.appid then + conf.appid = 'unset' + end + if not conf.server then + conf.server = 'http://127.0.0.1:10080' + end + + return true +end + + +local function fetch_rbac_token() + local args = ngx.req.get_uri_args() + if args and args.rbac_token then + return args.rbac_token + end + + local headers = ngx.req.get_headers() + if headers.Authorization then + return headers.Authorization + end + if headers['x-rbac-token'] then + return headers['x-rbac-token'] + end + local cookie, err = ck:new() + if not cookie then + return nil, err + end + local val, err = cookie:get("x-rbac-token") + return val, err +end + +local function loadjson(str) + local ok, jso = pcall(function() return cjson.decode(str) end) + if ok then + return jso + else + return nil, jso + end +end + +local function check_url_permission(server, appid, action, resName, clientIP, wolf_token) + local retry_max = 3 + local errmsg = nil; + local userInfo = nil + local res = nil + local err = nil + local access_check_url = server .. "/wolf/rbac/access_check" + local headers = new_headers() + headers["x-rbac-token"] = wolf_token + headers["Content-Type"] = "application/json; charset=utf-8" + local args = { appID = appid, resName = resName, action = action, clientIP=clientIP} + local url = access_check_url .. "?" .. ngx.encode_args(args) + local timeout = 1000 * 10 + + for i = 1, retry_max do + -- TODO: read apisix info. + res, err = http_get(url, headers, timeout) + if err then + errmsg = 'check permission failed!' .. tostring(err) + break + else + core.log.info("check permission request:", url, ", status:", res.status, ",body:", core.json.delay_encode(res.body)) + if res.status < 500 then + break + else + core.log.info("request [curl -v ", url, "] failed! status:", res.status) + if i < retry_max then + ngx.sleep(100) + end + end + end + end + + if err then + core.log.error("fail request: ", url, ", err:", err) + return {status=500, err="request to wolf-server failed, err:" .. tostring(err)} + elseif res.status == 200 or res.status == 401 then + local body, err = loadjson(res.body) + if err then + errmsg = 'check permission failed! parse response json failed!' + core.log.error( "loadjson(", res.body, ") failed! err:", err) + return {status=res.status, err=errmsg} + else + if body.data then + userInfo = body.data.userInfo + end + errmsg = body.reason + return {status=res.status, err=errmsg, userInfo=userInfo} + end + else + return {status=500, err='request to wolf-server failed, status:' .. tostring(res.status)} + end +end + + +function _M.rewrite(conf, ctx) + local url = ctx.var.uri + local action = ctx.var.request_method + local clientIP = core.request.get_ip(ctx) + local permItem = {action=action, url = url, clientIP = clientIP} + + local rbac_token, err = fetch_rbac_token() + if rbac_token == nil then + core.log.info("no permission to access ", core.json.delay_encode(permItem), ", need login!") 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