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app.go
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app.go
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package htmlhouse
import (
"database/sql"
"fmt"
"github.com/writeas/web-core/log"
"html/template"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"strings"
"github.com/gorilla/mux"
"github.com/writeas/impart"
)
type app struct {
cfg *config
router *mux.Router
db *sql.DB
session sessionManager
templates map[string]*template.Template
}
func newApp() (*app, error) {
var err error
app := &app{}
app.cfg, err = newConfig()
if err != nil {
return app, err
}
app.session, err = newSessionManager(app.cfg)
if err != nil {
return app, err
}
if !app.cfg.WFMode {
err = app.initDatabase()
if err != nil {
return app, err
}
}
app.initTemplates()
app.initRouter()
return app, nil
}
func (app *app) close() {
app.db.Close()
}
func (app *app) initRouter() {
app.router = mux.NewRouter()
api := app.router.PathPrefix("/⌂/").Subrouter()
if app.cfg.AllowPublish {
api.HandleFunc("/create", app.handler(createHouse)).Methods("POST").Name("create")
}
api.HandleFunc("/{house:[A-Za-z0-9.-]{8}}", app.handler(renovateHouse)).Methods("POST").Name("update")
api.HandleFunc("/public", app.handler(getPublicHousesData)).Methods("GET").Name("browse-api")
if app.cfg.WFMode {
horseAPI := app.router.PathPrefix("/🐴/").Subrouter()
horseAPI.HandleFunc("/stable", app.handler(redirectToStable))
}
admin := app.router.PathPrefix("/admin/").Subrouter()
admin.HandleFunc("/unpublish", app.handler(banHouse)).Methods("POST").Name("unpublish")
admin.HandleFunc("/republish", app.handler(unbanHouse)).Methods("POST").Name("republish")
app.router.HandleFunc("/", app.handler(getEditor)).Methods("GET").Name("index")
app.router.HandleFunc("/edit/{house:[A-Za-z0-9.-]{8}}.html", app.handler(getEditor)).Methods("GET").Name("edit")
app.router.HandleFunc("/stats/{house:[A-Za-z0-9.-]{8}}.html", app.handler(viewHouseStats)).Methods("GET").Name("stats")
if app.cfg.WFMode {
app.router.HandleFunc("/about.html", app.handler(handleHorseFile))
app.router.HandleFunc("/contact.html", app.handler(handleHorseFile))
app.router.PathPrefix("/js/").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.PathPrefix("/css/").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.PathPrefix("/img/").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.PathPrefix("/favicon.ico").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.PathPrefix("/404.html").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.PathPrefix("/browse").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
app.router.HandleFunc("/{house:[A-Za-z0-9.\\-/]+}", app.handler(getEditor)).Methods("GET").Name("edit")
} else {
app.router.HandleFunc("/{house:[A-Za-z0-9.-]{8}}.html", app.handler(getHouse)).Methods("GET").Name("get")
}
app.router.HandleFunc("/browse", app.handler(viewHouses)).Methods("GET").Name("browse")
app.router.PathPrefix("/").Handler(http.FileServer(http.Dir(app.cfg.StaticDir)))
}
func renderNotFound(app *app, w http.ResponseWriter, isHorse bool) error {
p := "404.html"
if isHorse {
p = "404-css.html"
}
page, err := ioutil.ReadFile(filepath.Join(app.cfg.StaticDir, p))
if err != nil {
page = []byte("<!DOCTYPE html><html><body>HTMLlot.</body></html>")
}
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "%s", page)
return err
}
type EditorPage struct {
ID string
Content string
Public bool
AllowPublish bool
SiteURL string
}
func getEditor(app *app, w http.ResponseWriter, r *http.Request) error {
vars := mux.Vars(r)
house := vars["house"]
editor := "editor"
if app.cfg.WFMode {
editor = "wf-editor"
}
if house == "" {
var defaultPage []byte
var err error
if app.cfg.WFMode {
return handleHorseFile(app, w, r)
} else {
defaultPage, err = ioutil.ReadFile(app.cfg.StaticDir + "/default.html")
if err != nil {
fmt.Printf("\n%s\n", err)
defaultPage = []byte("<!DOCTYPE html>\n<html>\n</html>")
}
}
app.templates[editor].ExecuteTemplate(w, "editor", &EditorPage{
Content: string(defaultPage),
AllowPublish: app.cfg.AllowPublish,
})
return nil
}
d := &EditorPage{
ID: house,
AllowPublish: app.cfg.AllowPublish,
}
var err error
if app.cfg.WFMode {
if strings.IndexRune(house, '.') == -1 {
return renderNotFound(app, w, true)
}
u, err := url.Parse("https://" + house)
if err != nil {
fmt.Fprintf(w, "Unable to parse '%s': %s", house, err)
return err
}
log.Info("Fetching %+v", u)
resp, err := http.Get(u.String())
if err != nil {
fmt.Fprintf(w, "Unable to fetch '%s': %s", u.String(), err)
return err
}
defer resp.Body.Close()
htmlBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
d.Content = string(htmlBytes)
// Change internal links to stay on designer
d.Content = strings.Replace(d.Content, `<a href="`+u.String(), `<a href="/`+u.Host+u.Path, -1)
d.Content = strings.Replace(d.Content, `href="/css/write.css"`, `href="`+u.Scheme+`://`+u.Host+`/css/write.css"`, -1)
d.Content = strings.Replace(d.Content, "<a ", `<a target="_parent" `, -1)
d.SiteURL = u.String()
} else {
d.Content, err = getHouseHTML(app, house)
if err != nil {
return err
}
d.Public = isHousePublic(app, house)
}
app.templates[editor].ExecuteTemplate(w, "editor", d)
return nil
}
type handlerFunc func(app *app, w http.ResponseWriter, r *http.Request) error
func (app *app) handler(h handlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
handleError(w, r, func() error {
return h(app, w, r)
}())
}
}
func handleError(w http.ResponseWriter, r *http.Request, err error) {
if err == nil {
return
}
if err, ok := err.(impart.HTTPError); ok {
if err.Status > 300 && err.Status <= 399 {
w.Header().Set("Location", err.Message)
w.WriteHeader(err.Status)
return
}
impart.WriteError(w, err)
return
}
impart.WriteError(w, impart.HTTPError{http.StatusInternalServerError, "This is an unhelpful error message for a miscellaneous internal error."})
}