341 lines
10 KiB
Go
341 lines
10 KiB
Go
package main
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import (
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"github.com/gorilla/mux"
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"github.com/gorilla/sessions"
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"net/http"
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"github.com/dballard/transmet/user"
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"fmt"
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"time"
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"io/ioutil"
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"regexp"
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"strings"
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"strconv"
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"github.com/dballard/transmet/categories"
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"github.com/dballard/transmet/news"
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"bytes"
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txtTemplate "text/template"
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"path"
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)
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func GetFlashes(session *sessions.Session) map[string]interface{} {
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var flashes = make(map[string]interface{})
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flashes["error"] = session.Flashes(flash_err)
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flashes["info"] = session.Flashes(flash_info)
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return flashes
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}
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func sessionWipe(session *sessions.Session) {
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session.Values = make(map[interface{}]interface{})
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}
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func initSessionUser(r *http.Request) (*user.User, *sessions.Session) {
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session, _ := store.Get(r, "c_user")
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if session.Values["username"] == nil {
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return nil, session
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}
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return user.NewUserFromUsername(db, session.Values["username"].(string)), session
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}
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// wrapper for handlers requiring a User
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func userHandler(next func(http.ResponseWriter, *http.Request, *user.User)) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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user, _ := initSessionUser(r)
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if user == nil {
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http.Redirect(w, r, "/login", http.StatusFound)
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} else {
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next(w, r, user)
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}
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}
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}
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// wrapper for handlers forking on GET and POST
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// r.HandleFunc("/login", getPostHandler(LoginFormHandler, LoginPostHandler))
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func getPostHandler(getFn, postFn func(http.ResponseWriter, *http.Request)) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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if r.Method == "GET" {
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getFn(w, r)
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} else { // POST
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postFn(w, r)
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}
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}
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}
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// Log in page handler
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func LoginFormHandler(w http.ResponseWriter, r *http.Request) {
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session, _ := store.Get(r, "c_user")
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flashes := GetFlashes(session)
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session.Save(r, w)
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ShowTemplate("login", w, map[string]interface{}{"flashes": flashes})
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}
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// handler for login POST
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// TODO: proper per account and client flood control rate limiting
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// currently weak per call slow down is by-passable at scale
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func LoginPostHandler(w http.ResponseWriter, r *http.Request) {
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time.Sleep(500 * time.Millisecond) // WEAK poor mans rate limiting for logins
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r.ParseForm()
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username := r.PostFormValue("username")
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// lookup user
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password := r.PostFormValue("password")
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user := user.NewUserFromAuth(db, username, password)
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if user != nil {
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session, _ := store.Get(r, "c_user")
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session.Values["username"] = user.Username
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session.Save(r, w)
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if r.URL.Query().Get("url") != "" {
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http.Redirect(w, r, "/add?" + r.URL.RawQuery, http.StatusFound)
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}
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http.Redirect(w, r, "/", http.StatusFound)
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} else {
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time.Sleep(500 * time.Millisecond) // WEAK bypassable poor mans rate limiting for failed logins
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session, _ := store.Get(r, "c_user")
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session.AddFlash("Username or password", flash_err)
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session.Save(r, w)
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http.Redirect(w, r, "/login?"+r.URL.RawQuery, http.StatusFound)
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}
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}
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// logout POST handler
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func LogoutHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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//session.Options = &sessions.Options{MaxAge: -1}
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sessionWipe(session)
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session.Save(r, w)
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http.Redirect(w, r, "/", http.StatusFound)
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}
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func getUrlTitle(url string) string {
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resp, err := http.Get(url)
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if err != nil {
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fmt.Println("Error looking up link", url, ":", err)
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} else {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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fmt.Println("Error reading link", url, ":", err)
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} else {
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re := regexp.MustCompile("< *[Tt][Ii][Tt][Ll][Ee] *>(.*)</ *[Tt][Ii][Tt][Ll][Ee] *>")
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title := re.FindStringSubmatch(string(body))
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if title != nil {
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return strings.TrimSpace(title[1])
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}
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}
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}
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return ""
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}
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// ?url=
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func addFormHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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categories.LoadCategories(db)
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session, _ := store.Get(r, "c_user")
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flashes := GetFlashes(session)
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popup := session.Values["popup"]
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delete(session.Values, "popup")
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title := session.Values["title"]
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delete(session.Values, "title")
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link := session.Values["link"]
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delete(session.Values, "link")
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description := session.Values["description"]
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delete(session.Values, "description")
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session.Save(r, w)
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if link != nil {
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//TODO category_id
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ShowTemplate("add", w, map[string]interface{}{"user": user, "flashes": flashes, "categories": categories.CategoriesTree, "link": link, "title": title, "description": description, "popup": popup})
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return
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}
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var url = r.URL.Query().Get("url")
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reHttp := regexp.MustCompile("^https?://")
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if url != "" && ! reHttp.Match([]byte(url)) {
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url = "http://" + url
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}
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title = r.URL.Query().Get("title")
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if title == "" && url != "" {
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title = getUrlTitle(url)
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}
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popup = r.URL.Query().Get("popup")
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ShowTemplate("add", w, map[string]interface{}{"user": user, "flashes": flashes, "link": url, "categories": categories.CategoriesTree, "title": title, "popup": popup})
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}
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func addPostHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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var news news.News
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news.Title = r.FormValue("title")
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news.Notes = r.FormValue("notes")
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news.Url = r.FormValue("link")
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popup := r.FormValue("popup")
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category_id, err := strconv.Atoi(r.FormValue("category"))
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if err != nil {
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category_id = -1
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}
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news.Category_id = category_id
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err = (&news).Insert(db)
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if err != nil {
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session.AddFlash("Error saving news: " + err.Error(), flash_err)
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session.Values["title"] = news.Title
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session.Values["link"] = news.Url
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session.Values["notes"] = news.Notes
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session.Values["popup"] = popup
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session.Save(r, w)
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http.Redirect(w, r, "/add", http.StatusFound)
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} else {
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// TODO auto close? redirect
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session.AddFlash("Added news \""+news.Title+"\"", flash_info)
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session.Save(r, w)
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if popup == "1" {
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http.Redirect(w, r, "/added", http.StatusFound)
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} else {
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http.Redirect(w, r, "/", http.StatusFound)
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}
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}
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}
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func templateFormHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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flashes := GetFlashes(session)
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session.Save(r, w)
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news, count, err := news.Unexported(db)
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if err != nil {
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return
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}
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var templateBuf bytes.Buffer
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template, err := txtTemplate.ParseFiles("templates/html_template.txt")
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if err != nil {
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fmt.Println("Error processing html_tempalte:" , err)
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}
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err = template.Execute(&templateBuf, map[string]interface{}{"news": news})
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if err != nil {
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fmt.Println("Exec err: ", err)
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}
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ShowTemplate("list", w, map[string]interface{}{"user": user, "flashes": flashes, "template": &templateBuf, "count": count, "url": config.Url})
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}
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func exportHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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err := news.MarkExported(db)
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if err != nil {
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session.AddFlash("Error marking last batch of news exported", flash_err)
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} else {
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session.AddFlash("Last batch of news marked exported", flash_info)
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}
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session.Save(r, w)
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http.Redirect(w, r, "/", http.StatusFound)
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}
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func addedHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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flashes := GetFlashes(session)
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session.Save(r, w)
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ShowTemplate("added", w, map[string]interface{}{"user": user, "flashes": flashes})
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}
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func categoriesFormHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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flashes := GetFlashes(session)
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session.Save(r, w)
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categories.LoadCategories(db)
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ShowTemplate("categories", w, map[string]interface{}{"user": user, "flashes": flashes, "categories": categories.CategoriesTree})
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}
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func categoriesPostHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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http.Redirect(w, r, "/categories", http.StatusFound)
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}
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func categoryFromReqArg(arg string) *categories.Category {
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if cid, err := strconv.Atoi(arg); err != nil {
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return nil
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} else if category, ok := categories.CategoriesFlat[cid]; !ok {
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return nil
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} else {
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return category
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}
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}
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func categoryChangeParentHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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categories.LoadCategories(db)
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category := categoryFromReqArg(r.FormValue("cid"))
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parent := categoryFromReqArg(r.FormValue("parent"))
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if category == nil {
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session.AddFlash("Invalid category", flash_err)
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} else {
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err := category.ChangeParent(db, parent)
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if err != nil {
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session.AddFlash("Error commiting to Database", flash_err)
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} else {
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session.AddFlash("Changed category parent", flash_info)
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}
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}
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session.Save(r, w)
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http.Redirect(w, r, "/categories", http.StatusFound)
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}
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func categoryAddHandler(w http.ResponseWriter, r *http.Request, user *user.User) {
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session, _ := store.Get(r, "c_user")
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name := categoryFromReqArg(r.FormValue("name"))
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parent := categoryFromReqArg(r.FormValue("parent"))
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if name == nil {
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session.AddFlash("Invalid category name", flash_err)
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} else {
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err := category.Add(db, name, parent)
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if err != nil {
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session.AddFlash("Error commiting to Database", flash_err)
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} else {
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session.AddFlash("Added category", flash_info)
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}
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}
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session.Save(r, w)
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http.Redirect(w, r, "/categories", http.StatusFound)
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}
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func ServeFileHandler(res http.ResponseWriter, req *http.Request) {
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fname := path.Base(req.URL.Path)
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http.ServeFile(res, req, "./"+fname)
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}
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func init_route_handlers() {
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http.Handle("/js/", http.StripPrefix("/js/", http.FileServer(http.Dir("js/"))))
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http.Handle("/css/", http.StripPrefix("/css/", http.FileServer(http.Dir("css/"))))
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http.Handle("/fonts/", http.StripPrefix("/fonts", http.FileServer(http.Dir("fonts/"))))
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http.HandleFunc("/favicon.ico", ServeFileHandler)
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r := mux.NewRouter()
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r.HandleFunc("/login", getPostHandler(LoginFormHandler, LoginPostHandler))
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r.HandleFunc("/logout", userHandler(LogoutHandler))
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r.HandleFunc("/add", getPostHandler(userHandler(addFormHandler), userHandler(addPostHandler)))
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r.HandleFunc("/", userHandler(templateFormHandler))
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r.HandleFunc("/export", userHandler(exportHandler))
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r.HandleFunc("/added", userHandler(addedHandler))
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r.HandleFunc("/categories", getPostHandler(userHandler(categoriesFormHandler), userHandler(categoriesPostHandler)))
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r.HandleFunc("/categories/change-parent", userHandler(categoryChangeParentHandler))
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r.HandleFunc("/categories/add", userHandler(categoryAddHandler))
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http.Handle("/", r)
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}
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