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form.go
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form.go
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package html
import (
"fmt"
"io"
"net/http"
"net/url"
"strings"
"golang.org/x/net/html"
)
func visit(n *html.Node, visitor func(*html.Node)) {
visitor(n)
for c := n.FirstChild; c != nil; c = c.NextSibling {
visit(c, visitor)
}
}
func GetElementsByTagName(root *html.Node, tagName string) []*html.Node {
elements := []*html.Node{}
visit(root, func(n *html.Node) {
if n.Type == html.ElementNode && n.Data == tagName {
elements = append(elements, n)
}
})
return elements
}
func GetAttr(element *html.Node, attrName string) (string, bool) {
for _, attr := range element.Attr {
if attr.Key == attrName {
return attr.Val, true
}
}
return "", false
}
type InputFilterFunc func(inputType, inputName, inputValue string) bool
// NewRequestFromForm builds a request that simulates submitting the given form. It honors:
// Form method (defaults to GET)
// Form action (defaults to currentURL if missing, or currentURL's scheme/host if server-relative)
// Input values from <input name="..." value="..."> elements
// * only the first type="submit" input's value is included
// * only radio and checkbox inputs with the "checked" attribute are included
func NewRequestFromForm(form *html.Node, currentURL *url.URL, filterFunc InputFilterFunc) (*http.Request, error) {
var (
reqMethod string
reqURL *url.URL
reqBody io.Reader
reqHeader http.Header = http.Header{}
err error
)
// Method defaults to GET if empty
if method, _ := GetAttr(form, "method"); len(method) > 0 {
reqMethod = strings.ToUpper(method)
} else {
reqMethod = "GET"
}
// URL defaults to current URL if empty
action, _ := GetAttr(form, "action")
reqURL, err = currentURL.Parse(action)
if err != nil {
return nil, err
}
formData := url.Values{}
if reqMethod == "GET" {
// Start with any existing query params when we're submitting via GET
formData = reqURL.Query()
}
addedSubmit := false
for _, input := range GetElementsByTagName(form, "input") {
if name, ok := GetAttr(input, "name"); ok {
if value, ok := GetAttr(input, "value"); ok {
inputType, _ := GetAttr(input, "type")
// Allow skipping inputs
if filterFunc != nil && !filterFunc(inputType, name, value) {
continue
}
switch inputType {
case "submit":
// If this is a submit input, only add the value of the first one.
// We're simulating submitting the form.
if !addedSubmit {
formData.Add(name, value)
addedSubmit = true
}
case "radio", "checkbox":
if _, checked := GetAttr(input, "checked"); checked {
formData.Add(name, value)
}
default:
formData.Add(name, value)
}
}
}
}
switch reqMethod {
case "GET":
reqURL.RawQuery = formData.Encode()
case "POST":
reqHeader.Set("Content-Type", "application/x-www-form-urlencoded")
reqBody = strings.NewReader(formData.Encode())
default:
return nil, fmt.Errorf("unknown method: %s", reqMethod)
}
req, err := http.NewRequest(reqMethod, reqURL.String(), reqBody)
if err != nil {
return nil, err
}
req.Header = reqHeader
return req, nil
}