145 lines
3.5 KiB
Go
145 lines
3.5 KiB
Go
package main
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import (
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"bytes"
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"compress/gzip"
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"fmt"
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"io"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"regexp"
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"strings"
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)
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func main() {
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proxy := &httputil.ReverseProxy{
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Rewrite: func(r *httputil.ProxyRequest) {
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host, _ := Yadro2Kernel(r.In.Host, true)
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url, _ := url.Parse("https://" + host)
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r.SetURL(url)
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// We only support gzip decoding
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r.Out.Header.Set("Accept-Encoding", "gzip")
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r.Out.Header.Set("User-Agent", "ядро.орг/1.0")
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},
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ModifyResponse: func(r *http.Response) error {
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// Disable security policy because of the domain restrictions.
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r.Header.Del("Content-Security-Policy")
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// Skip non-html pages.
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contentType := r.Header.Get("Content-Type")
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if !strings.HasPrefix(contentType, "text/") {
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return nil
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}
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r.Header.Set("Content-Type", contentType+";charset=utf-8")
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// Read response body into data. If body is encoded, decode it.
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var data []byte
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switch r.Header.Get("Content-Encoding") {
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case "gzip":
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reader, _ := gzip.NewReader(r.Body)
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data, _ = io.ReadAll(reader)
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r.Body.Close()
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default:
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data, _ = io.ReadAll(r.Body)
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r.Body.Close()
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}
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// Rewrite 30x redirect location
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locHeader := r.Header.Get("Location")
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if locHeader != "" {
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re := regexp.MustCompile(`https?:\/\/[A-Za-z\-\.]*.?kernel\.org\/`)
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r.Header.Set("Location", string(re.ReplaceAllFunc([]byte(locHeader), func(original_raw []byte) []byte {
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kernel := strings.ToLower(string(original_raw))
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kernel = strings.TrimPrefix(kernel, "https://")
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kernel = strings.TrimPrefix(kernel, "http://")
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kernel = strings.TrimPrefix(kernel, "www.")
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kernel = strings.TrimSuffix(kernel, "/")
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yadro, exists := Kernel2Yadro(kernel)
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if !exists {
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fmt.Println("Missing:", kernel)
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return original_raw
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}
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return []byte("http://" + yadro + "/") // TODO: https
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})))
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}
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// Modify the response.
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data = modifyResponse(data)
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// Remove headers that mess with body encoding and set the body.
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r.Header.Del("Content-Encoding")
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r.Header.Del("Content-Length")
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r.Body = io.NopCloser(bytes.NewReader(data))
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return nil
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},
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}
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http.ListenAndServe("0.0.0.0:80", proxy)
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}
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func replaceDomains(response []byte) []byte {
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re := regexp.MustCompile(`(?i)[A-Za-z\-\.]*\.?kernel\.org`)
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response = re.ReplaceAllFunc(response, func(original_raw []byte) []byte {
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kernel := strings.ToLower(string(original_raw))
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// Strip `www.`
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kernel = strings.TrimPrefix(kernel, "www.")
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yadro, exists := Kernel2Yadro(kernel)
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if !exists {
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fmt.Println("Missing:", kernel)
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return original_raw
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}
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return []byte(yadro)
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})
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response = bytes.ReplaceAll(response, []byte("%3F"), []byte("?"))
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response = bytes.ReplaceAll(response, []byte("%26"), []byte("&"))
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response = bytes.ReplaceAll(response, []byte("https"), []byte("http")) // TODO: TEMP
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return response
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}
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func translateWithPromtPuppies(response []byte) []byte {
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// Don't try to translate empty body (30x, etc)
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if len(response) == 0 {
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return response
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}
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req, _ := http.NewRequest("POST", "http://caddy:9000/translate", bytes.NewReader(response))
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req.Header.Add("Content-Type", "text/html")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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fmt.Fprintln(os.Stderr, "Error in first", err)
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return []byte{0}
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}
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response, _ = io.ReadAll(resp.Body)
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resp.Body.Close()
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return response
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}
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func modifyResponse(response []byte) []byte {
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response = translateWithPromtPuppies(response)
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response = replaceDomains(response)
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return response
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}
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