/
response.go
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/
response.go
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/*
*
* k6 - a next-generation load testing tool
* Copyright (C) 2016 Load Impact
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package http
import (
"errors"
"fmt"
"net/url"
"strings"
"github.com/dop251/goja"
"github.com/loadimpact/k6/js/common"
"github.com/loadimpact/k6/js/modules/k6/html"
"github.com/loadimpact/k6/lib/netext/httpext"
)
// Response is a representation of an HTTP response to be returned to the goja VM
type Response struct {
*httpext.Response `js:"-"`
}
func responseFromHttpext(resp *httpext.Response) *Response {
res := Response{resp}
return &res
}
// JSON parses the body of a response as json and returns it to the goja VM
func (res *Response) JSON(selector ...string) goja.Value {
v, err := res.Response.JSON(selector...)
if err != nil {
common.Throw(common.GetRuntime(res.GetCtx()), err)
}
if v == nil {
return goja.Undefined()
}
return common.GetRuntime(res.GetCtx()).ToValue(v)
}
// HTML returns the body as an html.Selection
func (res *Response) HTML(selector ...string) html.Selection {
var body string
switch b := res.Body.(type) {
case []byte:
body = string(b)
case string:
body = b
default:
common.Throw(common.GetRuntime(res.GetCtx()), errors.New("invalid response type"))
}
sel, err := html.HTML{}.ParseHTML(res.GetCtx(), body)
if err != nil {
common.Throw(common.GetRuntime(res.GetCtx()), err)
}
sel.URL = res.URL
if len(selector) > 0 {
sel = sel.Find(selector[0])
}
return sel
}
// SubmitForm parses the body as an html looking for a from and then submitting it
// TODO: document the actual arguments that can be provided
func (res *Response) SubmitForm(args ...goja.Value) (*Response, error) {
rt := common.GetRuntime(res.GetCtx())
formSelector := "form"
submitSelector := "[type=\"submit\"]"
var fields map[string]goja.Value
requestParams := goja.Null()
if len(args) > 0 {
params := args[0].ToObject(rt)
for _, k := range params.Keys() {
switch k {
case "formSelector":
formSelector = params.Get(k).String()
case "submitSelector":
submitSelector = params.Get(k).String()
case "fields":
if rt.ExportTo(params.Get(k), &fields) != nil {
fields = nil
}
case "params":
requestParams = params.Get(k)
}
}
}
form := res.HTML(formSelector)
if form.Size() == 0 {
common.Throw(rt, fmt.Errorf("no form found for selector '%s' in response '%s'", formSelector, res.URL))
}
methodAttr := form.Attr("method")
var requestMethod string
if methodAttr == goja.Undefined() {
// Use GET by default
requestMethod = HTTP_METHOD_GET
} else {
requestMethod = strings.ToUpper(methodAttr.String())
}
responseURL, err := url.Parse(res.URL)
if err != nil {
common.Throw(rt, err)
}
actionAttr := form.Attr("action")
var requestURL *url.URL
if actionAttr == goja.Undefined() {
// Use the url of the response if no action is set
requestURL = responseURL
} else {
actionURL, err := url.Parse(actionAttr.String())
if err != nil {
common.Throw(rt, err)
}
requestURL = responseURL.ResolveReference(actionURL)
}
// Set the body based on the form values
values := form.SerializeObject()
// Set the name + value of the submit button
submit := form.Find(submitSelector)
submitName := submit.Attr("name")
submitValue := submit.Val()
if submitName != goja.Undefined() && submitValue != goja.Undefined() {
values[submitName.String()] = submitValue
}
// Set the values supplied in the arguments, overriding automatically set values
for k, v := range fields {
values[k] = v
}
if requestMethod == HTTP_METHOD_GET {
q := url.Values{}
for k, v := range values {
q.Add(k, v.String())
}
requestURL.RawQuery = q.Encode()
return New().Request(res.GetCtx(), requestMethod, rt.ToValue(requestURL.String()), goja.Null(), requestParams)
}
return New().Request(res.GetCtx(), requestMethod, rt.ToValue(requestURL.String()), rt.ToValue(values), requestParams)
}
// ClickLink parses the body as an html, looks for a link and than makes a request as if the link was
// clicked
func (res *Response) ClickLink(args ...goja.Value) (*Response, error) {
rt := common.GetRuntime(res.GetCtx())
selector := "a[href]"
requestParams := goja.Null()
if len(args) > 0 {
params := args[0].ToObject(rt)
for _, k := range params.Keys() {
switch k {
case "selector":
selector = params.Get(k).String()
case "params":
requestParams = params.Get(k)
}
}
}
responseURL, err := url.Parse(res.URL)
if err != nil {
common.Throw(rt, err)
}
link := res.HTML(selector)
if link.Size() == 0 {
common.Throw(rt, fmt.Errorf("no element found for selector '%s' in response '%s'", selector, res.URL))
}
hrefAttr := link.Attr("href")
if hrefAttr == goja.Undefined() {
common.Throw(rt, fmt.Errorf("no valid href attribute value found on element '%s' in response '%s'", selector, res.URL))
}
hrefURL, err := url.Parse(hrefAttr.String())
if err != nil {
common.Throw(rt, err)
}
requestURL := responseURL.ResolveReference(hrefURL)
return New().Get(res.GetCtx(), rt.ToValue(requestURL.String()), requestParams)
}