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pageparser.go
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/
pageparser.go
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package spider
import (
"bytes"
"github.com/s-rah/onionscan/model"
"github.com/s-rah/onionscan/utils"
"golang.org/x/net/html"
"io"
"net/url"
"strings"
)
func NormalizeURI(uri string, base *url.URL) string {
if strings.HasPrefix("data:", uri) {
return "[embedded document]"
}
ref, err := url.Parse(uri)
if err != nil {
return uri
}
res := base.ResolveReference(ref)
return res.String()
}
func SnapshotResource(response io.Reader) model.Page {
page := model.Page{}
buf := make([]byte, 1024*512) // Read Max 0.5 MB
n, _ := io.ReadFull(response, buf)
page.Snapshot = string(buf[0:n])
return page
}
func SnapshotBinaryResource(response io.Reader) model.Page {
page := model.Page{}
buf := make([]byte, 1024*512) // Read Max 0.5 MB
n, _ := io.ReadFull(response, buf)
page.Raw = buf[0:n]
return page
}
func ParsePage(response io.Reader, base *url.URL, snapshot bool) model.Page {
page := model.Page{}
if snapshot {
buf := make([]byte, 1024*512) // Read Max 0.5 MB
n, _ := io.ReadFull(response, buf)
page.Snapshot = string(buf[0:n])
response = bytes.NewReader(buf[0:n])
}
z := html.NewTokenizer(response)
activeForm := model.Form{}
for {
tt := z.Next()
if tt == html.ErrorToken {
break
}
t := z.Token()
if t.Data == "title" && tt == html.StartTagToken {
tt := z.Next()
if tt == html.TextToken {
page.Title = string(z.Raw())
}
continue
}
if t.Data == "form" && tt == html.StartTagToken {
if activeForm.Action != "" {
page.Forms = append(page.Forms, activeForm)
}
activeForm = model.Form{}
activeForm.Action = NormalizeURI(utils.GetAttribute(t, "action"), base)
}
if t.Data == "input" {
field := model.Field{}
field.Name = utils.GetAttribute(t, "name")
field.Type = utils.GetAttribute(t, "type")
activeForm.Fields = append(activeForm.Fields, field)
}
if t.Data == "img" {
element := model.Element{}
element.Target = NormalizeURI(utils.GetAttribute(t, "src"), base)
element.Class = utils.GetAttribute(t, "class")
element.Title = utils.GetAttribute(t, "alt")
page.Images = append(page.Images, element)
}
if t.Data == "a" && (tt == html.StartTagToken || tt == html.SelfClosingTagToken) {
element := model.Element{}
element.Target = NormalizeURI(utils.GetAttribute(t, "href"), base)
element.Class = utils.GetAttribute(t, "class")
element.Title = utils.GetAttribute(t, "title")
tt := z.Next()
if tt == html.TextToken {
element.Text = string(z.Raw())
}
page.Anchors = append(page.Anchors, element)
continue
}
if t.Data == "link" && (tt == html.StartTagToken || tt == html.SelfClosingTagToken) {
element := model.Element{}
element.Target = NormalizeURI(utils.GetAttribute(t, "href"), base)
element.Class = utils.GetAttribute(t, "rel")
element.Title = utils.GetAttribute(t, "type")
page.Links = append(page.Links, element)
}
if t.Data == "script" && (tt == html.StartTagToken || tt == html.SelfClosingTagToken) {
element := model.Element{}
element.Target = NormalizeURI(utils.GetAttribute(t, "src"), base)
element.Class = utils.GetAttribute(t, "type")
page.Scripts = append(page.Scripts, element)
}
}
if activeForm.Action != "" {
page.Forms = append(page.Forms, activeForm)
}
return page
}