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form.go
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form.go
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package main
import (
"log"
"net"
"net/http"
"strings"
"github.com/microcosm-cc/bluemonday"
)
type FormHandler struct {
Config *Config
FormSubmission FormSubmission
}
type FormSubmission struct {
Id string
Body FormBody
FormCfg FormConfig
UserAgent string
UserIP string
Referrer string
}
func NewFormHandler(conf *Config) *FormHandler {
fh := &FormHandler{Config: conf}
return fh
}
func (fh *FormHandler) handleFormSubmission(w http.ResponseWriter, r *http.Request) {
submission := fh.process(w, r)
if !fh.checkSpam(submission) {
http.Error(w, "Spam detected", http.StatusBadRequest)
return
}
success := fh.sendMail(submission)
if !success {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
}
successRedirect := fh.Config.Global.BaseUrl + "/success.html"
if submission.FormCfg.Redirects.Success != "" {
successRedirect = submission.FormCfg.Redirects.Success
}
http.Redirect(w, r, successRedirect, http.StatusFound)
}
func (fh *FormHandler) getClientIP(r *http.Request) string {
ip := r.Header.Get("X-Forwarded-For")
if ip != "" {
return strings.Split(ip, ",")[0]
}
ip = r.Header.Get("X-Real-IP")
if ip != "" {
return ip
}
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return r.RemoteAddr
}
return ip
}
// process parses the form submission and returns a FormSubmission struct
func (fh *FormHandler) process(w http.ResponseWriter, r *http.Request) FormSubmission {
id := r.URL.Path[1:]
formCfg, exists := fh.Config.Forms[id]
if !exists {
http.NotFound(w, r)
}
if err := r.ParseForm(); err != nil {
log.Println("Failed to parse form:", err)
http.Error(w, "Failed to parse form", http.StatusInternalServerError)
}
fields := make(FormBody)
p := bluemonday.StrictPolicy()
for k, v := range r.Form {
fields[k] = p.Sanitize(v[0])
}
submission := FormSubmission{
Id: id,
Body: fields,
FormCfg: formCfg,
UserAgent: r.UserAgent(),
UserIP: fh.getClientIP(r),
Referrer: r.Referer(),
}
return submission
}
// sendMail sends the form submission as an email
// returns true if the email was sent successfully, false otherwise
func (fh *FormHandler) sendMail(sub FormSubmission) bool {
return buildAndSend(fh.Config, sub) == nil
}