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plugins.go
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plugins.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"time"
"github.com/TykTechnologies/logrus"
"github.com/gorilla/context"
"github.com/mitchellh/mapstructure"
"github.com/robertkrimen/otto"
_ "github.com/robertkrimen/otto/underscore"
)
// Lets the user override and return a response from middleware
type ReturnOverrides struct {
ResponseCode int
ResponseError string
}
// MiniRequestObject is marshalled to JSON string and pased into JSON middleware
type MiniRequestObject struct {
Headers map[string][]string
SetHeaders map[string]string
DeleteHeaders []string
Body string
URL string
Params map[string][]string
AddParams map[string]string
ExtendedParams map[string][]string
DeleteParams []string
ReturnOverrides ReturnOverrides
IgnoreBody bool
}
type VMReturnObject struct {
Request MiniRequestObject
SessionMeta map[string]string
Session SessionState
AuthValue string
}
type nopCloser struct {
io.Reader
}
func (nopCloser) Close() error {
return nil
}
// DynamicMiddleware is a generic middleware that will execute JS code before continuing
type DynamicMiddleware struct {
*TykMiddleware
MiddlewareClassName string
Pre bool
UseSession bool
Auth bool
}
type DynamicMiddlewareConfig struct {
ConfigData map[string]interface{} `mapstructure:"config_data" bson:"config_data" json:"config_data"`
}
func (mw *DynamicMiddleware) GetName() string {
return "DynamicMiddleware"
}
// New lets you do any initialisations for the object can be done here
func (d *DynamicMiddleware) New() {}
func (a *DynamicMiddleware) IsEnabledForSpec() bool {
return true
}
// GetConfig retrieves the configuration from the API config - we user mapstructure for this for simplicity
func (d *DynamicMiddleware) GetConfig() (interface{}, error) {
return nil, nil
}
type configDataDef struct {
ConfigData map[string]interface{} `mapstructure:"config_data" bson:"config_data" json:"config_data"`
}
func jsonConfigData(spec *APISpec) string {
var conf configDataDef
if err := mapstructure.Decode(spec.RawData, &conf); err != nil {
log.Error("Failed to parse configuration data: ", err)
return ""
}
bs, err := json.Marshal(conf)
if err != nil {
log.Error("Failed to encode configuration data: ", err)
return ""
}
return string(bs)
}
// ProcessRequest will run any checks on the request on the way through the system, return an error to have the chain fail
func (d *DynamicMiddleware) ProcessRequest(w http.ResponseWriter, r *http.Request, configuration interface{}) (error, int) {
t1 := time.Now().UnixNano()
// Createthe proxy object
defer r.Body.Close()
originalBody, err := ioutil.ReadAll(r.Body)
if err != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to read request body! ", err)
return nil, 200
}
thisRequestData := MiniRequestObject{
Headers: r.Header,
SetHeaders: make(map[string]string),
DeleteHeaders: make([]string, 0),
Body: string(originalBody),
URL: r.URL.Path,
Params: r.URL.Query(),
AddParams: make(map[string]string),
ExtendedParams: make(map[string][]string),
DeleteParams: make([]string, 0),
IgnoreBody: false,
}
asJsonRequestObj, encErr := json.Marshal(thisRequestData)
if encErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to encode request object for dynamic middleware: ", encErr)
return nil, 200
}
var thisSessionState = SessionState{}
var authHeaderValue = ""
confData := jsonConfigData(d.Spec)
// Encode the session object (if not a pre-process)
if !d.Pre {
if d.UseSession {
thisSessionState = context.Get(r, SessionData).(SessionState)
authHeaderValue = context.Get(r, AuthHeaderValue).(string)
}
}
sessionAsJsonObj, sessEncErr := json.Marshal(thisSessionState)
if sessEncErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to encode session for VM: ", sessEncErr)
return nil, 200
}
// Run the middleware
middlewareClassname := d.MiddlewareClassName
vm := d.Spec.JSVM.VM.Copy()
vm.Interrupt = make(chan func(), 1)
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Debug("Running: ", middlewareClassname)
// buffered, leaving no chance of a goroutine leak since the
// spawned goroutine will send 0 or 1 values.
ret := make(chan otto.Value, 1)
errRet := make(chan error, 1)
go func() {
defer func() {
// the VM executes the panic func that gets it
// to stop, so we must recover here to not crash
// the whole Go program.
recover()
}()
returnRaw, err := vm.Run(middlewareClassname + `.DoProcessRequest(` + string(asJsonRequestObj) + `, ` + string(sessionAsJsonObj) + `, ` + confData + `);`)
ret <- returnRaw
errRet <- err
}()
var returnRaw otto.Value
t := time.NewTimer(d.Spec.JSVM.Timeout)
select {
case returnRaw = <-ret:
if err := <-errRet; err != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to run JS middleware: ", err)
return nil, 200
}
t.Stop()
case <-t.C:
t.Stop()
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("JS middleware timed out after ", d.Spec.JSVM.Timeout)
vm.Interrupt <- func() {
// only way to stop the VM is to send it a func
// that panics.
panic("stop")
}
return nil, 200
}
returnDataStr, _ := returnRaw.ToString()
// Decode the return object
newRequestData := VMReturnObject{}
decErr := json.Unmarshal([]byte(returnDataStr), &newRequestData)
if decErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to decode middleware request data on return from VM: ", decErr)
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Debug(returnDataStr)
return nil, 200
}
// Reconstruct the request parts
if newRequestData.Request.IgnoreBody {
r.ContentLength = int64(len(originalBody))
r.Body = nopCloser{bytes.NewBuffer(originalBody)}
} else {
r.ContentLength = int64(len(newRequestData.Request.Body))
r.Body = nopCloser{bytes.NewBufferString(newRequestData.Request.Body)}
}
r.URL.Path = newRequestData.Request.URL
// Delete and set headers
for _, dh := range newRequestData.Request.DeleteHeaders {
r.Header.Del(dh)
}
for h, v := range newRequestData.Request.SetHeaders {
r.Header.Set(h, v)
}
// Delete and set request parameters
values := r.URL.Query()
for _, k := range newRequestData.Request.DeleteParams {
values.Del(k)
}
for p, v := range newRequestData.Request.AddParams {
values.Set(p, v)
}
for p, v := range newRequestData.Request.ExtendedParams {
for _, val := range v {
values.Add(p, val)
}
}
r.URL.RawQuery = values.Encode()
// Save the sesison data (if modified)
if !d.Pre {
if d.UseSession {
if len(newRequestData.SessionMeta) > 0 {
thisSessionState.MetaData = newRequestData.SessionMeta
d.Spec.SessionManager.UpdateSession(authHeaderValue, thisSessionState, GetLifetime(d.Spec, &thisSessionState))
}
}
}
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Debug("JSVM middleware execution took: (ns) ", time.Now().UnixNano()-t1)
if newRequestData.Request.ReturnOverrides.ResponseCode != 0 {
return errors.New(newRequestData.Request.ReturnOverrides.ResponseError), newRequestData.Request.ReturnOverrides.ResponseCode
}
if d.Auth {
context.Set(r, SessionData, newRequestData.Session)
context.Set(r, AuthHeaderValue, newRequestData.AuthValue)
}
return nil, 200
}
// --- Utility functions during startup to ensure a sane VM is present for each API Def ----
type JSVM struct {
VM *otto.Otto
Timeout time.Duration
}
// Init creates the JSVM with the core library (tyk.js) and sets up a
// default timeout.
func (j *JSVM) Init() {
vm := otto.New()
// Init TykJS namespace, constructors etc.
jscore, _ := ioutil.ReadFile(config.TykJSPath)
vm.Run(jscore)
j.VM = vm
// Add environment API
j.LoadTykJSApi()
j.Timeout = 5 * time.Second
}
// LoadJSPaths will load JS classes and functionality in to the VM by file
func (j *JSVM) LoadJSPaths(paths []string, pathPrefix string) {
tykBundlePath := filepath.Join(config.MiddlewarePath, "bundles")
for _, mwPath := range paths {
if pathPrefix != "" {
mwPath = filepath.Join(tykBundlePath, pathPrefix, mwPath)
}
js, loadErr := ioutil.ReadFile(mwPath)
if loadErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("Failed to load Middleware JS: ", loadErr)
} else {
// No error, load the JS into the VM
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Info("Loading JS File: ", mwPath)
j.VM.Run(js)
}
}
}
type TykJSHttpRequest struct {
Method string
Body string
Headers map[string]string
Domain string
Resource string
FormData map[string]string
}
type TykJSHttpResponse struct {
Code int
Body string
Headers map[string][]string
}
func (j *JSVM) LoadTykJSApi() {
// Enable a log
j.VM.Set("log", func(call otto.FunctionCall) otto.Value {
log.WithFields(logrus.Fields{
"prefix": "jsvm-logmsg",
"type": "log-msg",
}).Info(call.Argument(0).String())
return otto.Value{}
})
j.VM.Set("rawlog", func(call otto.FunctionCall) otto.Value {
rawLog.Print(call.Argument(0).String() + "\n")
return otto.Value{}
})
// Enable the creation of HTTP Requsts
j.VM.Set("TykMakeHttpRequest", func(call otto.FunctionCall) otto.Value {
jsonHRO := call.Argument(0).String()
HRO := TykJSHttpRequest{}
if jsonHRO != "undefined" {
jsonErr := json.Unmarshal([]byte(jsonHRO), &HRO)
if jsonErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("JSVM: Failed to deserialise HTTP Request object")
return otto.Value{}
}
// Make the request
domain := HRO.Domain
data := url.Values{}
for k, v := range HRO.FormData {
data.Set(k, v)
}
u, _ := url.ParseRequestURI(domain)
u.Path = HRO.Resource
urlStr := fmt.Sprintf("%v", u) // "https://api.com/user/"
client := &http.Client{}
var d *string
if HRO.Body != "" {
d = &HRO.Body
} else {
if len(HRO.FormData) > 0 {
thisD := data.Encode()
d = &thisD
} else {
d = nil
}
}
r, _ := http.NewRequest(HRO.Method, urlStr, nil)
if d != nil {
r, _ = http.NewRequest(HRO.Method, urlStr, bytes.NewBufferString(*d))
}
for k, v := range HRO.Headers {
r.Header.Add(k, v)
}
r.Close = true
resp, respErr := client.Do(r)
if respErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("[JSVM]: Request failed: ", respErr)
return otto.Value{}
}
body, _ := ioutil.ReadAll(resp.Body)
tykResp := TykJSHttpResponse{
Code: resp.StatusCode,
Body: string(body),
Headers: resp.Header,
}
retAsStr, _ := json.Marshal(tykResp)
returnVal, retErr := j.VM.ToValue(string(retAsStr))
if retErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("[JSVM]: Failed to encode return value: ", retErr)
return otto.Value{}
}
return returnVal
}
// Nope, return nothing
return otto.Value{}
})
// Expose Setters and Getters in the REST API for a key:
j.VM.Set("TykGetKeyData", func(call otto.FunctionCall) otto.Value {
apiKey := call.Argument(0).String()
apiId := call.Argument(1).String()
byteArray, _ := handleGetDetail(apiKey, apiId)
returnVal, retErr := j.VM.ToValue(string(byteArray))
if retErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("[JSVM]: Failed to encode return value: ", retErr)
return otto.Value{}
}
return returnVal
})
j.VM.Set("TykSetKeyData", func(call otto.FunctionCall) otto.Value {
apiKey := call.Argument(0).String()
encoddedSession := call.Argument(1).String()
suppress_reset := call.Argument(2).String()
newSession := SessionState{}
decErr := json.Unmarshal([]byte(encoddedSession), &newSession)
if decErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("[JSVM]: Failed to decode the sesison data")
return otto.Value{}
}
var dont_reset bool = false
if suppress_reset == "1" {
dont_reset = true
}
doAddOrUpdate(apiKey, newSession, dont_reset)
return otto.Value{}
})
// Batch request method
unsafeBatchHandler := BatchRequestHandler{}
j.VM.Set("TykBatchRequest", func(call otto.FunctionCall) otto.Value {
requestSet := call.Argument(0).String()
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Debug("Batch input is: ", requestSet)
byteArray := unsafeBatchHandler.ManualBatchRequest([]byte(requestSet))
returnVal, retErr := j.VM.ToValue(string(byteArray))
if retErr != nil {
log.WithFields(logrus.Fields{
"prefix": "jsvm",
}).Error("[JSVM]: Failed to encode return value: ", retErr)
return otto.Value{}
}
return returnVal
})
TykReturnFunc := `
function TykJsResponse(response, session_meta) {
return JSON.stringify({Response: response, SessionMeta: session_meta})
};`
j.VM.Run(TykReturnFunc)
}