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Add index page

pull/5/head
Trevor Slocum 2 years ago
parent
commit
44aa04981e
  1. 4
      README.md
  2. 22
      pkg/gmitohtml/assets.go
  3. 129
      pkg/gmitohtml/convert.go
  4. 153
      pkg/gmitohtml/daemon.go
  5. 4
      pkg/gmitohtml/doc.go

4
README.md

@ -1,8 +1,10 @@
# gmitohtml
[![GoDoc](https://gitlab.com/tslocum/godoc-static/-/raw/master/badge.svg)](https://docs.rocketnine.space/gitlab.com/tslocum/gmitohtml)
[![CI status](https://gitlab.com/tslocum/gmitohtml/badges/master/pipeline.svg)](https://gitlab.com/tslocum/gmitohtml/commits/master)
[![Donate](https://img.shields.io/liberapay/receives/rocketnine.space.svg?logo=liberapay)](https://liberapay.com/rocketnine.space)
[Gemini](https://gemini.circumlunar.space) to HTML conversion tool and daemon
[Gemini](https://gemini.circumlunar.space) to [HTML](https://en.wikipedia.org/wiki/HTML)
conversion tool and daemon
## Download

22
pkg/gmitohtml/assets.go

@ -2,6 +2,28 @@ package gmitohtml
var fs = make(inMemoryFS)
const indexPage = `
<!DOCTYPE html>
<html>
<head>
<title>Xenia</title>
<link rel="stylesheet" href="/assets/style.css"></link>
</head>
<body>
<h1>Welcome to Xenia</h1><br>
<form method="post" action="/">
<input type="text" name="address" placeholder="Address" size="50" autofocus> <input type="submit" value="Go">
</form>
<br>
<ul>
<li><a href="/gemini/gus.guru/">GUS - Gemini Universal Search</a></li>
<li><a href="/gemini/gemini.circumlunar.space/">Gemini protocol</a></li>
<li><a href="https://gitlab.com/tslocum/xenia">Xenia</a></li>
</ul>
</body>
</html>
`
func loadAssets() {
fs["/assets/style.css"] = loadFile("style.css", `
/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */

129
pkg/gmitohtml/convert.go

@ -3,12 +3,8 @@ package gmitohtml
import (
"bufio"
"bytes"
"crypto/tls"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"path"
"strings"
@ -74,6 +70,9 @@ func Convert(page []byte, u string) []byte {
if l >= 7 && bytes.HasPrefix(line, []byte("=> ")) {
split := bytes.SplitN(line[3:], []byte(" "), 2)
if len(split) != 2 {
split = bytes.SplitN(line[3:], []byte("\t"), 2)
}
if len(split) == 2 {
link := append([]byte(`<a href="`), rewriteURL(string(split[0]), parsedURL)...)
link = append(link, []byte(`">`)...)
@ -110,125 +109,3 @@ func Convert(page []byte, u string) []byte {
result = append(result, []byte("\n</body>\n</html>")...)
return result
}
// Fetch downloads and converts a Gemini page.
func fetch(u string, clientCertFile string, clientCertKey string) ([]byte, []byte, error) {
if u == "" {
return nil, nil, ErrInvalidURL
}
requestURL, err := url.ParseRequestURI(u)
if err != nil {
return nil, nil, err
}
if requestURL.Scheme == "" {
requestURL.Scheme = "gemini"
}
host := requestURL.Host
if strings.IndexRune(host, ':') == -1 {
host += ":1965"
}
tlsConfig := &tls.Config{}
conn, err := tls.Dial("tcp", host, tlsConfig)
if err != nil {
return nil, nil, err
}
// Send request header
conn.Write([]byte(requestURL.String() + "\r\n"))
data, err := ioutil.ReadAll(conn)
if err != nil {
return nil, nil, err
}
firstNewLine := -1
l := len(data)
if l > 2 {
for i := 1; i < l; i++ {
if data[i] == '\n' && data[i-1] == '\r' {
firstNewLine = i
break
}
}
}
var header []byte
if firstNewLine > -1 {
header = data[:firstNewLine]
data = data[firstNewLine+1:]
}
if bytes.HasPrefix(header, []byte("text/html")) {
return header, data, nil
}
return header, Convert(data, requestURL.String()), nil
}
func handleRequest(writer http.ResponseWriter, request *http.Request) {
defer request.Body.Close()
if request.URL == nil {
return
}
pathSplit := strings.Split(request.URL.Path, "/")
if len(pathSplit) < 2 || pathSplit[1] != "gemini" {
writer.Write([]byte("Error: invalid protocol, only Gemini is supported"))
return
}
u, err := url.ParseRequestURI("gemini://" + strings.Join(pathSplit[2:], "/"))
if err != nil {
writer.Write([]byte("Error: invalid URL"))
return
}
header, data, err := fetch(u.String(), "", "")
if err != nil {
fmt.Fprintf(writer, "Error: failed to fetch %s: %s", u, err)
return
}
if len(header) > 0 && header[0] == '3' {
split := bytes.SplitN(header, []byte(" "), 2)
if len(split) == 2 {
http.Redirect(writer, request, rewriteURL(string(split[1]), request.URL), http.StatusTemporaryRedirect)
return
}
}
if len(header) > 3 && !bytes.HasPrefix(header[3:], []byte("text/gemini")) {
writer.Header().Set("Content-Type", string(header[3:]))
} else {
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
}
writer.Write(data)
}
func handleAssets(writer http.ResponseWriter, request *http.Request) {
assetLock.Lock()
defer assetLock.Unlock()
writer.Header().Set("Cache-Control", "max-age=86400")
http.FileServer(fs).ServeHTTP(writer, request)
}
// StartDaemon starts the page conversion daemon.
func StartDaemon(address string) error {
loadAssets()
daemonAddress = address
handler := http.NewServeMux()
handler.HandleFunc("/assets/style.css", handleAssets)
handler.HandleFunc("/", handleRequest)
go func() {
log.Fatal(http.ListenAndServe(address, handler))
}()
return nil
}

153
pkg/gmitohtml/daemon.go

@ -0,0 +1,153 @@
package gmitohtml
import (
"bytes"
"crypto/tls"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
)
// Fetch downloads and converts a Gemini page.
func fetch(u string, clientCertFile string, clientCertKey string) ([]byte, []byte, error) {
if u == "" {
return nil, nil, ErrInvalidURL
}
requestURL, err := url.ParseRequestURI(u)
if err != nil {
return nil, nil, err
}
if requestURL.Scheme == "" {
requestURL.Scheme = "gemini"
}
host := requestURL.Host
if strings.IndexRune(host, ':') == -1 {
host += ":1965"
}
tlsConfig := &tls.Config{
// This must be enabled until most sites have transitioned away from
// using self-signed certificates.
InsecureSkipVerify: true,
}
conn, err := tls.Dial("tcp", host, tlsConfig)
if err != nil {
return nil, nil, err
}
// Send request header
conn.Write([]byte(requestURL.String() + "\r\n"))
data, err := ioutil.ReadAll(conn)
if err != nil {
return nil, nil, err
}
firstNewLine := -1
l := len(data)
if l > 2 {
for i := 1; i < l; i++ {
if data[i] == '\n' && data[i-1] == '\r' {
firstNewLine = i
break
}
}
}
var header []byte
if firstNewLine > -1 {
header = data[:firstNewLine]
data = data[firstNewLine+1:]
}
if bytes.HasPrefix(header, []byte("text/html")) {
return header, data, nil
}
return header, Convert(data, requestURL.String()), nil
}
func handleIndex(writer http.ResponseWriter, request *http.Request) {
address := request.FormValue("address")
if address != "" {
http.Redirect(writer, request, rewriteURL(address, request.URL), http.StatusTemporaryRedirect)
return
}
writer.Write([]byte(indexPage))
}
func handleRequest(writer http.ResponseWriter, request *http.Request) {
defer request.Body.Close()
if request.URL == nil {
return
}
if request.URL.Path == "/" {
handleIndex(writer, request)
return
}
pathSplit := strings.Split(request.URL.Path, "/")
if len(pathSplit) < 2 || pathSplit[1] != "gemini" {
writer.Write([]byte("Error: invalid protocol, only Gemini is supported"))
return
}
u, err := url.ParseRequestURI("gemini://" + strings.Join(pathSplit[2:], "/"))
if err != nil {
writer.Write([]byte("Error: invalid URL"))
return
}
header, data, err := fetch(u.String(), "", "")
if err != nil {
fmt.Fprintf(writer, "Error: failed to fetch %s: %s", u, err)
return
}
if len(header) > 0 && header[0] == '3' {
split := bytes.SplitN(header, []byte(" "), 2)
if len(split) == 2 {
http.Redirect(writer, request, rewriteURL(string(split[1]), request.URL), http.StatusTemporaryRedirect)
return
}
}
if len(header) > 3 && !bytes.HasPrefix(header[3:], []byte("text/gemini")) {
writer.Header().Set("Content-Type", string(header[3:]))
} else {
writer.Header().Set("Content-Type", "text/html; charset=utf-8")
}
writer.Write(data)
}
func handleAssets(writer http.ResponseWriter, request *http.Request) {
assetLock.Lock()
defer assetLock.Unlock()
writer.Header().Set("Cache-Control", "max-age=86400")
http.FileServer(fs).ServeHTTP(writer, request)
}
// StartDaemon starts the page conversion daemon.
func StartDaemon(address string) error {
loadAssets()
daemonAddress = address
handler := http.NewServeMux()
handler.HandleFunc("/assets/style.css", handleAssets)
handler.HandleFunc("/", handleRequest)
go func() {
log.Fatal(http.ListenAndServe(address, handler))
}()
return nil
}

4
pkg/gmitohtml/doc.go

@ -0,0 +1,4 @@
/*
Package gmitohtml converts Gemini pages to HTML.
*/
package gmitohtml
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