305 行
8.1 KiB
Go
305 行
8.1 KiB
Go
// htwtxt – hosted twtxt server; see README for copyright and license info
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package main
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import "bufio"
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import "errors"
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import "flag"
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import "github.com/gorilla/mux"
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import "golang.org/x/crypto/bcrypt"
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import "html/template"
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import "io/ioutil"
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import "log"
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import "net/http"
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import "os"
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import "strconv"
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import "strings"
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import "time"
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const loginsFile = "logins.txt"
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const feedsDir = "feeds"
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var dataDir string
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var loginsPath string
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var feedsPath string
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var templ *template.Template
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func createFileIfNotExists(path string) {
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if _, err := os.Stat(path); err != nil {
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file, err := os.Create(path)
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if err != nil {
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log.Fatal("Can't create file: ", err)
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}
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file.Close()
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}
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}
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func appendToFile(path string, msg string) {
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fileWrite, err := os.OpenFile(path, os.O_APPEND|os.O_WRONLY, 0600)
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defer fileWrite.Close()
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if err != nil {
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log.Fatal("Can't open file for appending", err)
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}
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if _, err = fileWrite.WriteString(msg); err != nil {
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log.Fatal("Can't write to file", err)
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}
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}
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func onlyLegalRunes(str string) bool {
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alphabet := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" +
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"0123456789_"
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for _, ru := range str {
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if !(strings.ContainsRune(alphabet, ru)) {
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return false
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}
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}
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return true
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}
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func execTemplate(w http.ResponseWriter, file string, input string) {
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type data struct{ Msg string }
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err := templ.ExecuteTemplate(w, file, data{Msg: input})
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if err != nil {
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log.Fatal("Trouble executing template", err)
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}
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}
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func login(w http.ResponseWriter, r *http.Request) (string, error) {
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name := r.FormValue("name")
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pw := r.FormValue("password")
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loginValid := false
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file, err := os.Open(loginsPath)
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defer file.Close()
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if err != nil {
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log.Fatal("Can't open file for reading", err)
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}
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scanner := bufio.NewScanner(bufio.NewReader(file))
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for {
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if !scanner.Scan() {
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break
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}
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line := scanner.Text()
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tokens := strings.Split(line, " ")
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if len(tokens) == 3 {
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if 0 == strings.Compare(tokens[0], name) &&
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nil == bcrypt.CompareHashAndPassword(
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[]byte(tokens[1]), []byte(pw)) {
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loginValid = true
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}
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}
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}
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if !loginValid {
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execTemplate(w, "error.html", "Bad login.")
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return name, errors.New("")
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}
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return name, nil
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}
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func accountLine(w http.ResponseWriter, r *http.Request,
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checkDupl bool) (string, error) {
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name := r.FormValue("name")
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pw := r.FormValue("new_password")
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pw2 := r.FormValue("new_password2")
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mail := r.FormValue("mail")
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if 0 != strings.Compare(pw, pw2) || 0 == strings.Compare("name", "") ||
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0 == strings.Compare(pw, "") || !onlyLegalRunes(name) ||
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len(name) > 140 {
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execTemplate(w, "error.html", "Invalid values.")
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return "", errors.New("")
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}
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if checkDupl {
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fileRead, err := os.Open(loginsPath)
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defer fileRead.Close()
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if err != nil {
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log.Fatal("Can't open file for reading", err)
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}
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scanner := bufio.NewScanner(bufio.NewReader(fileRead))
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for {
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if !scanner.Scan() {
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break
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}
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line := scanner.Text()
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tokens := strings.Split(line, " ")
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if 0 == strings.Compare(name, tokens[0]) {
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execTemplate(w, "error.html", "Username taken.")
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return "", errors.New("")
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}
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}
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}
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hash, err := bcrypt.GenerateFromPassword([]byte(pw), bcrypt.DefaultCost)
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if err != nil {
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log.Fatal("Can't generate password hash", err)
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}
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return name + " " + string(hash) + " " + mail, nil
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}
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func indexHandler(w http.ResponseWriter, r *http.Request) {
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execTemplate(w, "index.html", "")
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}
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func signUpFormHandler(w http.ResponseWriter, r *http.Request) {
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execTemplate(w, "signupform.html", "")
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}
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func signUpHandler(w http.ResponseWriter, r *http.Request) {
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newLine, err := accountLine(w, r, true)
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if err != nil {
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return
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}
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appendToFile(loginsPath, newLine+"\n")
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execTemplate(w, "feedset.html", "")
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}
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func accountFormHandler(w http.ResponseWriter, r *http.Request) {
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execTemplate(w, "accountform.html", "")
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}
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func accountPostHandler(w http.ResponseWriter, r *http.Request) {
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name, err := login(w, r)
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if err != nil {
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return
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}
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newLine, err := accountLine(w, r, false)
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if err != nil {
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return
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}
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text, err := ioutil.ReadFile(loginsPath)
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if err != nil {
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log.Fatal("Can't read file", err)
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}
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lines := strings.Split(string(text), "\n")
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for i, line := range lines {
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tokens := strings.Split(line, " ")
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if 0 == strings.Compare(name, tokens[0]) {
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lines[i] = newLine
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break
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}
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}
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text = []byte(strings.Join(lines, "\n"))
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tmpFile := "tmp_" + loginsPath
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if err := ioutil.WriteFile(tmpFile, []byte(text), 0600); err != nil {
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log.Fatal("Trouble writing file", err)
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}
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if err := os.Rename(loginsPath, "_"+loginsFile); err != nil {
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log.Fatal("Trouble moving file", err)
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}
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if err := os.Rename(tmpFile, loginsPath); err != nil {
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log.Fatal("Trouble moving file", err)
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}
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if err := os.Remove("_" + loginsPath); err != nil {
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log.Fatal("Trouble removing file", err)
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}
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execTemplate(w, "feedset.html", "")
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}
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func listHandler(w http.ResponseWriter, r *http.Request) {
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file, err := os.Open(loginsPath)
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defer file.Close()
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if err != nil {
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log.Fatal("Can't open file for reading", err)
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}
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scanner := bufio.NewScanner(bufio.NewReader(file))
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var dir []string
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for {
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if !scanner.Scan() {
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break
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}
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line := scanner.Text()
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tokens := strings.Split(line, " ")
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if len(tokens) == 3 {
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dir = append(dir, tokens[0])
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}
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}
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type data struct{ Dir []string }
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err = templ.ExecuteTemplate(w, "list.html", data{Dir: dir})
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if err != nil {
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log.Fatal("Trouble executing template", err)
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}
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}
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func twtxtPostHandler(w http.ResponseWriter, r *http.Request) {
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name, err := login(w, r)
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if err != nil {
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return
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}
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text := r.FormValue("twt")
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twtsFile := feedsPath + "/" + name
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createFileIfNotExists(twtsFile)
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text = strings.Replace(text, "\n", " ", -1)
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appendToFile(twtsFile, time.Now().Format(time.RFC3339)+"\t"+text+"\n")
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http.Redirect(w, r, "/"+feedsDir+"/"+name, 302)
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}
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func twtxtHandler(w http.ResponseWriter, r *http.Request) {
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name := mux.Vars(r)["name"]
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if !onlyLegalRunes(name) {
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execTemplate(w, "error.html", "Bad path.")
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return
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}
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path := feedsPath + "/" + name
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if _, err := os.Stat(path); err != nil {
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execTemplate(w, "error.html", "Empty twtxt for user.")
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return
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}
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http.ServeFile(w, r, path)
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}
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func main() {
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var err error
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portPtr := flag.Int("port", 8000, "port to serve")
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keyPtr := flag.String("key", "", "SSL key file")
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certPtr := flag.String("cert", "", "SSL certificate file")
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templDirPtr := flag.String("templates",
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os.Getenv("GOPATH")+"/src/htwtxt/templates",
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"directory where to expect HTML templates")
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flag.StringVar(&dataDir, "dir", os.Getenv("HOME")+"/htwtxt",
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"directory to store feeds and login data")
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flag.Parse()
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log.Println("Using as templates dir:", *templDirPtr)
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log.Println("Using as data dir:", dataDir)
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loginsPath = dataDir + "/" + loginsFile
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feedsPath = dataDir + "/" + feedsDir
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if ("" == *keyPtr && "" != *certPtr) ||
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("" != *keyPtr && "" == *certPtr) {
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log.Fatal("Expect either both key and certificate or none.")
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}
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if "" != *keyPtr {
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log.Println("Using TLS.")
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if _, err := os.Stat(*certPtr); err != nil {
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log.Fatal("No certificate file found.")
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}
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if _, err := os.Stat(*keyPtr); err != nil {
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log.Fatal("No server key file found.")
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}
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}
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createFileIfNotExists(loginsPath)
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// TODO: Handle err here.
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_ = os.Mkdir(feedsPath, 0700)
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templ, err = template.New("main").ParseGlob(*templDirPtr + "/*.html")
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if err != nil {
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log.Fatal("Can't set up new template: ", err)
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}
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router := mux.NewRouter()
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router.HandleFunc("/", indexHandler)
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router.HandleFunc("/feeds", listHandler).Methods("GET")
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router.HandleFunc("/feeds/", listHandler)
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router.HandleFunc("/account", accountFormHandler).Methods("GET")
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router.HandleFunc("/account", accountPostHandler).Methods("POST")
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router.HandleFunc("/signup", signUpFormHandler).Methods("GET")
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router.HandleFunc("/signup", signUpHandler).Methods("POST")
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router.HandleFunc("/feeds", twtxtPostHandler).Methods("POST")
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router.HandleFunc("/feeds/{name}", twtxtHandler)
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http.Handle("/", router)
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log.Println("serving at port", *portPtr)
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if "" != *keyPtr {
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err = http.ListenAndServeTLS(":"+strconv.Itoa(*portPtr),
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*certPtr, *keyPtr, nil)
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} else {
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err = http.ListenAndServe(":"+strconv.Itoa(*portPtr), nil)
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}
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if err != nil {
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log.Fatal("ListenAndServe: ", err)
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}
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}
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