site.go
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package main import ( "errors" "fmt" "io/ioutil" "log" "net/http" "net/url" "os" "path/filepath" "strings" "text/template" "time" "git.j3s.sh/vore/lib" "git.j3s.sh/vore/reaper" "git.j3s.sh/vore/rss" "git.j3s.sh/vore/sqlite" "golang.org/x/crypto/bcrypt" ) type Site struct { // title of the website title string // contains every single feed reaper *reaper.Reaper // site database handle db *sqlite.DB } // New returns a fully populated & ready for action Site func New() *Site { title := "vore" db := sqlite.New(title + ".db") s := Site{ title: title, reaper: reaper.New(db), db: db, } return &s } // rootHandler is our "wildcard handler", so in addition to // serving /, it also acts as a router for a few arbitrary // patterns that can't be registered at starttime // this includes /<username>, static files, and 404 func (s *Site) rootHandler(w http.ResponseWriter, r *http.Request) { if r.URL.Path == "/" { s.indexHandler(w, r) return } // handles /<username> if s.db.UserExists(strings.TrimPrefix(r.URL.Path, "/")) { s.userHandler(w, r) return } // handles static files file := filepath.Join("files", "static", strings.TrimPrefix(r.URL.Path, "/")) if _, err := os.Stat(file); !errors.Is(err, os.ErrNotExist) { http.ServeFile(w, r, file) return } // 404 http.NotFound(w, r) } func (s *Site) indexHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET") { return } if s.loggedIn(r) { http.Redirect(w, r, "/"+s.username(r), http.StatusSeeOther) return } s.renderPage(w, r, "index", nil) } func (s *Site) changelogHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET") { return } s.renderPage(w, r, "changelog", nil) } func (s *Site) loginHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET", "POST") { return } if r.Method == "GET" { if s.loggedIn(r) { http.Redirect(w, r, "/", http.StatusSeeOther) } else { s.renderPage(w, r, "login", nil) } } if r.Method == "POST" { username := r.FormValue("username") password := r.FormValue("password") err := s.login(w, username, password) if err != nil { s.renderErr(w, err.Error(), http.StatusUnauthorized) return } http.Redirect(w, r, "/", http.StatusSeeOther) } } // TODO: make this take a POST only in accordance w/ some spec func (s *Site) logoutHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET", "POST") { return } http.SetCookie(w, &http.Cookie{ Name: "session_token", Value: "", }) http.Redirect(w, r, "/", http.StatusSeeOther) } func (s *Site) registerHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "POST") { return } username := r.FormValue("username") password := r.FormValue("password") err := s.register(username, password) if err != nil { s.renderErr(w, err.Error(), http.StatusInternalServerError) return } err = s.login(w, username, password) if err != nil { s.renderErr(w, err.Error(), http.StatusInternalServerError) return } http.Redirect(w, r, "/", http.StatusSeeOther) } func (s *Site) userHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET") { return } username := strings.TrimPrefix(r.URL.Path, "/") items := s.reaper.SortFeedItemsByDate(s.reaper.GetUserFeeds(username)) data := struct { User string Items []*rss.Item }{ User: username, Items: items, } s.renderPage(w, r, "user", data) } func (s *Site) settingsHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "GET") { return } if !s.loggedIn(r) { s.renderErr(w, "", http.StatusUnauthorized) return } var feeds []*rss.Feed feeds = s.reaper.GetUserFeeds(s.username(r)) s.renderPage(w, r, "feeds", feeds) } // TODO: // // show diff before submission (like tf plan) // check if feed exists in db already? // validate that title exists func (s *Site) feedsSubmitHandler(w http.ResponseWriter, r *http.Request) { if !s.methodAllowed(w, r, "POST") { return } if !s.loggedIn(r) { s.renderErr(w, "", http.StatusUnauthorized) return } // validate user input var validatedURLs []string for _, inputURL := range strings.Split(r.FormValue("submit"), "\r\n") { inputURL = strings.TrimSpace(inputURL) if inputURL == "" { continue } // if the entry is already in reaper, don't validate if s.reaper.HasFeed(inputURL) { validatedURLs = append(validatedURLs, inputURL) continue } if _, err := url.ParseRequestURI(inputURL); err != nil { e := fmt.Sprintf("can't parse url '%s': %s", inputURL, err) s.renderErr(w, e, http.StatusBadRequest) return } validatedURLs = append(validatedURLs, inputURL) } // write to reaper + db for _, u := range validatedURLs { // if it's in reaper, it's in the db, safe to skip if s.reaper.HasFeed(u) { continue } err := s.reaper.Fetch(u) if err != nil { e := fmt.Sprintf("reaper: can't fetch '%s' %s", u, err) s.renderErr(w, e, http.StatusBadRequest) return } s.db.WriteFeed(u) } // subscribe to all listed feeds exclusively s.db.UnsubscribeAll(s.username(r)) for _, url := range validatedURLs { s.db.Subscribe(s.username(r), url) } http.Redirect(w, r, "/feeds", http.StatusSeeOther) } // username fetches a client's username based // on the sessionToken that user has set. username // will return "" if there is no sessionToken. func (s *Site) username(r *http.Request) string { cookie, err := r.Cookie("session_token") if err == http.ErrNoCookie { return "" } if err != nil { log.Println(err) } username := s.db.GetUsernameBySessionToken(cookie.Value) return username } func (s *Site) loggedIn(r *http.Request) bool { if s.username(r) == "" { return false } return true } // login compares the sqlite password field against the user supplied password and // sets a session token against the supplied writer. func (s *Site) login(w http.ResponseWriter, username string, password string) error { if username == "" { return fmt.Errorf("username cannot be empty") } if password == "" { return fmt.Errorf("password cannot be empty") } if !s.db.UserExists(username) { return fmt.Errorf("user '%s' does not exist", username) } storedPassword := s.db.GetPassword(username) err := bcrypt.CompareHashAndPassword([]byte(storedPassword), []byte(password)) if err != nil { return fmt.Errorf("invalid password") } sessionToken := lib.GenerateSessionToken() err = s.db.SetSessionToken(username, sessionToken) if err != nil { log.Println(err) } http.SetCookie(w, &http.Cookie{ Name: "session_token", // 18 years Expires: time.Now().Add(time.Hour * 24 * 365 * 18), Value: sessionToken, }) return nil } func (s *Site) register(username string, password string) error { if s.db.UserExists(username) { return fmt.Errorf("user '%s' already exists", username) } hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost) if err != nil { return err } err = s.db.AddUser(username, string(hashedPassword)) if err != nil { return err } return nil } // renderPage renders the given page and passes data to the // template execution engine. it's normally the last thing a // handler should do tbh. func (s *Site) renderPage(w http.ResponseWriter, r *http.Request, page string, data any) { funcMap := template.FuncMap{ "printDomain": s.printDomain, "timeSince": s.timeSince, "trimSpace": strings.TrimSpace, } tmplFiles := filepath.Join("files", "*.tmpl.html") tmpl := template.Must(template.New("whatever").Funcs(funcMap).ParseGlob(tmplFiles)) // we read the stylesheet in order to render it inline cssFile := filepath.Join("files", "style.css") stylesheet, err := ioutil.ReadFile(cssFile) if err != nil { panic(err) } // fields on this anon struct are generally // pulled out of Data when they're globally required // callers should jam anything they want into Data pageData := struct { Title string Username string LoggedIn bool StyleSheet string CutePhrase string Data any }{ Title: page + " | " + s.title, Username: s.username(r), LoggedIn: s.loggedIn(r), StyleSheet: string(stylesheet), CutePhrase: s.randomCutePhrase(), Data: data, } err = tmpl.ExecuteTemplate(w, page, pageData) if err != nil { s.renderErr(w, err.Error(), http.StatusInternalServerError) return } } // printDomain does a best-effort uri parse and // prints the base domain, otherwise returning the // unmodified string func (s *Site) printDomain(rawURL string) string { parsedURL, err := url.Parse(rawURL) if err == nil { return parsedURL.Hostname() } // do our best to trim it manually if url parsing fails trimmedStr := strings.TrimSpace(rawURL) trimmedStr = strings.TrimPrefix(trimmedStr, "http://") trimmedStr = strings.TrimPrefix(trimmedStr, "https://") return strings.Split(trimmedStr, "/")[0] } func (s *Site) timeSince(t time.Time) string { now := time.Now() duration := now.Sub(t) minutes := int(duration.Minutes()) hours := int(duration.Hours()) days := int(duration.Hours() / 24) weeks := int(duration.Hours() / (24 * 7)) months := int(duration.Hours() / (24 * 7 * 4)) years := int(duration.Hours() / (24 * 7 * 4 * 12)) if years > 100 { return fmt.Sprintf("over 100 years ago ಠ_ಠ") } else if years > 1 { return fmt.Sprintf("%d years ago", years) } else if months > 1 { return fmt.Sprintf("%d months ago", months) } else if weeks > 1 { return fmt.Sprintf("%d weeks ago", weeks) } else if days > 1 { return fmt.Sprintf("%d days ago", days) } else if hours > 1 { return fmt.Sprintf("%d hours ago", hours) } else if minutes > 1 { return fmt.Sprintf("%d mins ago", minutes) } else { return fmt.Sprintf("just now") } } // renderErr sets the correct http status in the header, // optionally decorates certain errors, then renders the err page func (s *Site) renderErr(w http.ResponseWriter, error string, code int) { var prefix string switch code { case http.StatusBadRequest: prefix = "400 bad request\n" case http.StatusUnauthorized: prefix = "401 unauthorized\n" case http.StatusMethodNotAllowed: prefix = "405 method not allowed\n" prefix += "request method: " case http.StatusInternalServerError: prefix = "(╥﹏╥) oopsie woopsie, uwu\n" prefix += "we made a fucky wucky (╥﹏╥)\n\n" prefix += "500 internal server error\n" } log.Println(prefix + error) http.Error(w, prefix+error, code) } // methodAllowed takes an http w/r, and returns true if the // http requests method is in teh allowedMethods list. // if methodNotAllowed returns false, it has already // written a request & it's on the caller to close it. func (s *Site) methodAllowed(w http.ResponseWriter, r *http.Request, allowedMethods ...string) bool { allowed := false for _, m := range allowedMethods { if m == r.Method { allowed = true } } if allowed == false { w.Header().Set("Allow", strings.Join(allowedMethods, ", ")) s.renderErr(w, r.Method, http.StatusMethodNotAllowed) } return allowed }