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server.go
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// Copyright (C) 2013 Andras Belicza. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// Implementation of the GUI server which handles sessions,
// renders the windows and handles event dispatching.
package gwu
import (
"errors"
"fmt"
"log"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
)
// Internal path constants.
const (
pathStatic = "_gwu_static/" // App path-relative path for GWU static contents.
pathSessCheck = "_sess_ch" // App path-relative path for checking session (without registering access)
pathEvent = "e" // Window-relative path for sending events
pathRenderComp = "rc" // Window-relative path for rendering a component
)
// Parameters passed between the browser and the server.
const (
paramEventType = "et" // Event type parameter name
paramCompID = "cid" // Component id parameter name
paramCompValue = "cval" // Component value parameter name
paramFocusedCompID = "fcid" // Focused component id parameter name
paramMouseWX = "mwx" // Mouse x pixel coordinate (inside window)
paramMouseWY = "mwy" // Mouse y pixel coordinate (inside window)
paramMouseX = "mx" // Mouse x pixel coordinate (relative to source component)
paramMouseY = "my" // Mouse y pixel coordinate (relative to source component)
paramMouseBtn = "mb" // Mouse button
paramModKeys = "mk" // Modifier key states
paramKeyCode = "kc" // Key code
)
// Event response actions (client actions to take after processing an event).
const (
eraNoAction = iota // Event processing OK and no action required
eraReloadWin // Window name to be reloaded
eraDirtyComps // There are dirty components which needs to be refreshed
eraFocusComp // Focus a compnent
)
// GWU session id cookie name
const gwuSessidCookie = "gwu-sessid"
// SessionHandler interface defines a callback to get notified
// for certain events related to session life-cycles.
type SessionHandler interface {
// Created is called when a new session is created.
// At this time the client does not yet know about the session.
Created(sess Session)
// Removed is called when a session is being removed
// from the server. After removal, the session id will become
// an invalid session id.
Removed(sess Session)
}
// AppRootHandlerFunc is the function type that handles the application root (when no window name is specified).
// sess is the shared, public session if no private session is created.
type AppRootHandlerFunc func(w http.ResponseWriter, r *http.Request, sess Session)
// Server interface defines the GUI server which handles sessions,
// renders the windows, components and handles event dispatching.
type Server interface {
// The Server implements the Session interface:
// there is one public session which is shared between
// the "sessionless" requests.
// This is to maintain windows without a session.
Session
// A server has text which will be used as the title
// of the server.
HasText
// Secure returns if the server is configured to run
// in secure (HTTPS) mode or in HTTP mode.
Secure() bool
// AppURL returns the application URL string.
AppURL() string
// AppPath returns the application path string.
AppPath() string
// AddSessCreatorName registers a nonexistent window name
// whose path auto-creates a new session.
//
// Normally sessions are created from event handlers during
// event dispatching by calling Event.NewSession(). This
// requires a public window and an event source component
// (e.g. a Button) to create a session.
// With AddSessCreatorName you can register nonexistent (meaning
// not-yet added) window names whose path will trigger an automatic
// session creation (if the current session is not private), and
// with a registered SessionHandler you can build the window and
// add it to the auto-created new session prior to it being served.
//
// The text linking to the name will be included in the window list
// if text is a non-empty string.
//
// Tip: You can use this to pre-register a login window for example.
// You can call
// AddSessCreatorName("login", "Login Window")
// and in the Created() method of a registered SessionHandler:
// func (h MySessHanlder) Created(s gwu.Session) {
// win := gwu.NewWindow("login", "Login Window")
// // ...add content to the login window...
// s.AddWindow(win)
// }
AddSessCreatorName(name, text string)
// AddSHandler adds a new session handler.
AddSHandler(handler SessionHandler)
// SetHeaders sets extra HTTP response headers that are added to all responses.
// Supplied values are copied, so changes to the passed map afterwards have no effect.
//
// For example to add an extra "Gowut-Server" header whose value is the Gowut version:
// server.SetHeaders(map[string][]string{
// "Gowut-Server": {gwu.GowutVersion},
// })
SetHeaders(headers map[string][]string)
// Headers returns the extra HTTP response headers that are added to all repsonses.
// A copy is returned, so changes to the returned map afterwards have no effect.
Headers() map[string][]string
// AddStaticDir registers a directory whose content (files) recursively
// will be served by the server when requested.
// path is an app-path relative path to address a file, dir is the root directory
// to search in.
// Note that the app name must be included in absolute request paths,
// and it may be omitted if you want to use relative paths.
// Extra headers set by SetHeaders() will also be included in responses serving the static files.
//
// Example:
// AddStaticDir("img", "/tmp/myimg")
// Then request for absolute path "/appname/img/faces/happy.gif" will serve
// "/tmp/myimg/faces/happy.gif", just as the the request for relative path "img/faces/happy.gif".
AddStaticDir(path, dir string) error
// Theme returns the default CSS theme of the server.
Theme() string
// SetTheme sets the default CSS theme of the server.
SetTheme(theme string)
// SetLogger sets the logger to be used
// to log incoming requests.
// Pass nil to disable logging. This is the default.
SetLogger(logger *log.Logger)
// Logger returns the logger that is used to log incoming requests.
Logger() *log.Logger
// AddRootHeadHTML adds an HTML text which will be included
// in the HTML <head> section of the window list page (the app root).
// Note that these will be ignored if you take over the app root
// (by calling SetAppRootHandler).
AddRootHeadHTML(html string)
// RemoveRootHeadHTML removes an HTML head text
// that was previously added with AddRootHeadHTML().
RemoveRootHeadHTML(html string)
// SetAppRootHandler sets a function that is called when the app root is requested.
// The default function renders the window list, including authenticated windows
// and session creators - with clickable links.
// By setting your own hander, you will completely take over the app root.
SetAppRootHandler(f AppRootHandlerFunc)
// Start starts the GUI server and waits for incoming connections.
//
// Sessionless window names may be specified as optional parameters
// that will be opened in the default browser.
// Tip: Pass an empty string to open the window list.
// Tip: Not passing any window names will start the server silently
// without opening any windows.
Start(openWins ...string) error
}
// Server implementation.
type serverImpl struct {
sessionImpl // Single public session implementation
hasTextImpl // Has text implementation
appName string // Application name (part of the application path)
addr string // Server address
secure bool // Tells if the server is configured to run in secure (HTTPS) mode
appPath string // Application path
appURLString string // Application URL string
appURL *url.URL // Application URL, parsed
sessions map[string]Session // Sessions
certFile, keyFile string // Certificate and key files for secure (HTTPS) mode
sessCreatorNames map[string]string // Session creator names
sessionHandlers []SessionHandler // Registered session handlers
theme string // Default CSS theme of the server
logger *log.Logger // Logger.
headers http.Header // Extra headers that will be added to all responses.
rootHeads []string // Additional head HTML texts of the window list page (app root)
appRootHandlerFunc AppRootHandlerFunc // App root handler function
}
// NewServer creates a new GUI server in HTTP mode.
// The specified app name will be part of the application path (the first part).
// If addr is empty string, "localhost:3434" will be used.
//
// Tip: Pass an empty string as appName to place the GUI server to the root path ("/").
func NewServer(appName, addr string) Server {
return newServerImpl(appName, addr, "", "")
}
// NewServerTLS creates a new GUI server in secure (HTTPS) mode.
// The specified app name will be part of the application path (the first part).
// If addr is empty string, "localhost:3434" will be used.
//
// Tip: Pass an empty string as appName to place the GUI server to the root path ("/").
// Tip: You can use generate_cert.go in crypto/tls to generate
// a test certificate and key file (cert.pem andkey.pem).
func NewServerTLS(appName, addr, certFile, keyFile string) Server {
return newServerImpl(appName, addr, certFile, keyFile)
}
// newServerImpl creates a new serverImpl.
func newServerImpl(appName, addr, certFile, keyFile string) *serverImpl {
if addr == "" {
addr = "localhost:3434"
}
s := &serverImpl{sessionImpl: newSessionImpl(false), appName: appName, addr: addr, sessions: make(map[string]Session),
sessCreatorNames: make(map[string]string), theme: ThemeDefault}
if s.appName == "" {
s.appPath = "/"
} else {
s.appPath = "/" + s.appName + "/"
}
if certFile == "" || keyFile == "" {
s.secure = false
s.appURLString = "http://" + addr + s.appPath
} else {
s.secure = true
s.appURLString = "https://" + addr + s.appPath
s.certFile = certFile
s.keyFile = keyFile
}
var err error
if s.appURL, err = url.Parse(s.appURLString); err != nil {
panic(fmt.Sprintf("Parse %q: %+v", s.appURLString, err))
}
s.appRootHandlerFunc = s.renderWinList
return s
}
func (s *serverImpl) Secure() bool {
return s.secure
}
func (s *serverImpl) AppURL() string {
return s.appURLString
}
func (s *serverImpl) AppPath() string {
return s.appPath
}
func (s *serverImpl) AddSessCreatorName(name, text string) {
if len(name) > 0 {
s.sessCreatorNames[name] = text
}
}
func (s *serverImpl) AddSHandler(handler SessionHandler) {
s.sessionHandlers = append(s.sessionHandlers, handler)
}
// newSession creates a new (private) Session.
// The event is optional. If specified and the current session
// (as returned by Event.Session()) is private, it will be removed first.
// The new session is set to the event, and also returned.
func (s *serverImpl) newSession(e *eventImpl) Session {
if e != nil {
// First remove old session
s.removeSess(e)
}
sessImpl := newSessionImpl(true)
sess := &sessImpl
if e != nil {
e.shared.session = sess
}
// Store new session
s.sessions[sess.ID()] = sess
if s.logger != nil {
s.logger.Println("SESSION created:", sess.ID())
} else {
log.Println("SESSION created:", sess.ID())
}
// Notify session handlers
for _, handler := range s.sessionHandlers {
handler.Created(sess)
}
return sess
}
// removeSess removes (invalidates) the current session of the specified event.
// Only private sessions can be removed, calling this
// when the current session (as returned by Event.Session()) is public is a no-op.
// After this method Event.Session() will return the shared public session.
func (s *serverImpl) removeSess(e *eventImpl) {
if e.shared.session.Private() {
s.removeSess2(e.shared.session)
e.shared.session = &s.sessionImpl
}
}
// removeSess2 removes (invalidates) the specified session.
// Only private sessions can be removed, calling this with the
// public session is a no-op.
func (s *serverImpl) removeSess2(sess Session) {
if sess.Private() {
if s.logger != nil {
s.logger.Println("SESSION removed:", sess.ID())
} else {
log.Println("SESSION removed:", sess.ID())
}
// Notify session handlers
for _, handler := range s.sessionHandlers {
handler.Removed(sess)
}
delete(s.sessions, sess.ID())
}
}
// addSessCookie lets the client know about the specified (new) session
// by setting the GWU session id cookie.
// Also clears the new flag of the session.
func (s *serverImpl) addSessCookie(sess Session, w http.ResponseWriter) {
// HttpOnly: do not allow non-HTTP access to it (like javascript) to prevent stealing it...
// Secure: only send it over HTTPS
// MaxAge: to specify the max age of the cookie in seconds, else it's a session cookie and gets deleted after the browser is closed.
c := http.Cookie{
Name: gwuSessidCookie, Value: sess.ID(),
Path: s.appURL.EscapedPath(),
HttpOnly: true, Secure: s.secure,
MaxAge: 72 * 60 * 60, // 72 hours max age
}
http.SetCookie(w, &c)
sess.clearNew()
}
// sessCleaner periodically checks whether private sessions has timed out
// in an endless loop. If a session has timed out, removes it.
// This method is to start as a new go routine.
func (s *serverImpl) sessCleaner() {
sleep := 10 * time.Second
for {
now := time.Now()
// TODO synchronization?
for _, sess := range s.sessions {
if now.Sub(sess.Accessed()) > sess.Timeout() {
s.removeSess2(sess)
}
}
time.Sleep(sleep)
}
}
func (s *serverImpl) SetHeaders(headers map[string][]string) {
s.headers = make(map[string][]string, len(headers))
for k, v := range headers {
// Also copy value which is a slice
s.headers[k] = append(make([]string, 0, len(v)), v...)
}
}
func (s *serverImpl) Headers() map[string][]string {
headers := make(map[string][]string, len(s.headers))
for k, v := range s.headers {
// Also copy value which is a slice
headers[k] = append(make([]string, 0, len(v)), v...)
}
return headers
}
// addHeaders adds the extra headers to the specified response.
func (s *serverImpl) addHeaders(w http.ResponseWriter) {
header := w.Header()
for k, v := range s.headers {
for _, v2 := range v {
header.Add(k, v2)
}
}
}
func (s *serverImpl) AddStaticDir(path, dir string) error {
if strings.HasPrefix(path, "/") {
path = path[1:]
}
if path == "" {
return errors.New("path cannot be empty string")
}
if !strings.HasSuffix(path, "/") {
path += "/"
}
origPath := path
path = s.appPath + path
// pathEvent and pathRenderComp are window-relative so no need to check with those
if path == s.appPath+pathStatic || path == s.appPath+pathSessCheck {
return errors.New("Path cannot be '" + origPath + "' (reserved)!")
}
handler := http.StripPrefix(path, http.FileServer(http.Dir(dir)))
// To include extra headers in the response of static handler:
http.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
s.addHeaders(w)
handler.ServeHTTP(w, r)
})
return nil
}
func (s *serverImpl) Theme() string {
return s.theme
}
func (s *serverImpl) SetTheme(theme string) {
s.theme = theme
}
func (s *serverImpl) SetLogger(logger *log.Logger) {
s.logger = logger
}
func (s *serverImpl) Logger() *log.Logger {
return s.logger
}
func (s *serverImpl) AddRootHeadHTML(html string) {
s.rootHeads = append(s.rootHeads, html)
}
func (s *serverImpl) RemoveRootHeadHTML(html string) {
for i, v := range s.rootHeads {
if v == html {
old := s.rootHeads
s.rootHeads = append(s.rootHeads[:i], s.rootHeads[i+1:]...)
old[len(old)-1] = ""
return
}
}
}
func (s *serverImpl) SetAppRootHandler(f AppRootHandlerFunc) {
s.appRootHandlerFunc = f
}
// serveStatic handles the static contents of GWU.
func (s *serverImpl) serveStatic(w http.ResponseWriter, r *http.Request) {
s.addHeaders(w)
// Parts example: "/appname/_gwu_static/gwu-0.8.0.js" => {"", "appname", "_gwu_static", "gwu-0.8.0.js"}
parts := strings.Split(r.URL.Path, "/")
if s.appName == "" {
// No app name, gui server resides in root
if len(parts) < 2 {
// This should never happen. Path is always at least a slash ("/").
http.NotFound(w, r)
return
}
// Omit the first empty string and pathStatic
parts = parts[2:]
} else {
// We have app name
if len(parts) < 3 {
// Missing app name from path
http.NotFound(w, r)
return
}
// Omit the first empty string, app name and pathStatic
parts = parts[3:]
}
res := parts[0]
if res == resNameStaticJs {
w.Header().Set("Expires", time.Now().UTC().Add(72*time.Hour).Format(http.TimeFormat)) // Set 72 hours caching
w.Header().Set("Content-Type", "application/x-javascript; charset=utf-8")
w.Write(staticJs)
return
}
if strings.HasSuffix(res, ".css") {
cssCode := staticCSS[res]
if cssCode != nil {
w.Header().Set("Expires", time.Now().UTC().Add(72*time.Hour).Format(http.TimeFormat)) // Set 72 hours caching
w.Header().Set("Content-Type", "text/css; charset=utf-8")
w.Write(cssCode)
return
}
}
http.NotFound(w, r)
}
// serveHTTP handles the incoming requests.
// Renders of the URL-selected window,
// and also handles event dispatching.
func (s *serverImpl) serveHTTP(w http.ResponseWriter, r *http.Request) {
if s.logger != nil {
s.logger.Println("Incoming:", r.URL.Path)
}
s.addHeaders(w)
// Check session
var sess Session
c, err := r.Cookie(gwuSessidCookie)
if err == nil {
sess = s.sessions[c.Value]
}
if sess == nil {
sess = &s.sessionImpl
}
// Parts example: "/appname/winname/e?et=0&cid=1" => {"", "appname", "winname", "e"}
parts := strings.Split(r.URL.Path, "/")
if s.appName == "" {
// No app name, gui server resides in root
if len(parts) < 1 {
// This should never happen. Path is always at least a slash ("/").
http.NotFound(w, r)
return
}
// Omit the first empty string
parts = parts[1:]
} else {
// We have app name
if len(parts) < 2 {
// Missing app name from path
http.NotFound(w, r)
return
}
// Omit the first empty string and the app name
parts = parts[2:]
}
if len(parts) >= 1 && parts[0] == pathSessCheck {
// Session check. Must not call sess.acess()
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
sess.rwMutex().RLock()
remaining := sess.Timeout() - time.Now().Sub(sess.Accessed())
sess.rwMutex().RUnlock()
fmt.Fprintf(w, "%f", remaining.Seconds())
return
}
if len(parts) < 1 || parts[0] == "" {
// Missing window name, render window list
s.appRootHandlerFunc(w, r, sess)
return
}
winName := parts[0]
win := sess.WinByName(winName)
// If not found and we're on an authenticated session, try the public window list
if win == nil && sess.Private() {
win = s.WinByName(winName) // Server is a Session, the public session
if win != nil {
// We're serving a public window, switch to public session here entirely
sess = &s.sessionImpl
}
}
// If still not found and no private session, try the session creator names
if win == nil && !sess.Private() {
if _, found := s.sessCreatorNames[winName]; found {
sess = s.newSession(nil)
s.addSessCookie(sess, w)
// Search again in the new session as SessionHandlers may have added windows.
win = sess.WinByName(winName)
}
}
if win == nil {
// Invalid window name, render an error message with a link to the window list
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusNotFound)
NewWriter(w).Writess("<html><body>Window for name <b>'", winName, `'</b> not found. See the <a href="`, s.appPath, `">Window list</a>.</body></html>`)
return
}
sess.access()
var path string
if len(parts) >= 2 {
path = parts[1]
}
rwMutex := sess.rwMutex()
switch path {
case pathEvent:
rwMutex.Lock()
defer rwMutex.Unlock()
s.handleEvent(sess, win, w, r)
case pathRenderComp:
rwMutex.RLock()
defer rwMutex.RUnlock()
// Render just a component
s.renderComp(win, w, r)
default:
rwMutex.RLock()
defer rwMutex.RUnlock()
// Render the whole window
win.RenderWin(NewWriter(w), s)
}
}
// renderWinList builds a temporary Window, adds links to the windows of
// a session, and renders the Window.
func (s *serverImpl) renderWinList(wr http.ResponseWriter, r *http.Request, sess Session) {
if s.logger != nil {
s.logger.Println("\tRendering windows list.")
}
win := NewWindow("windowList", s.text+" - Window List")
titleLabel := NewLabel(s.text + " - Window List")
titleLabel.Style().SetFontWeight(FontWeightBold).SetFontSize("1.3em")
win.Add(titleLabel)
addLinks := func(title string, nameTexts [][2]string) {
if len(nameTexts) == 0 {
return
}
win.AddVSpace(10)
win.Add(NewLabel(title))
for _, nameText := range nameTexts {
link := NewLink(nameText[1], path.Join(s.appPath, nameText[0]))
link.Style().SetPaddingLeftPx(20)
win.Add(link)
}
}
// Render both private and public session windows
sessions := make([]Session, 1, 2)
sessions[0] = sess
nameTexts := make([][2]string, 0, len(s.sessCreatorNames)+1)
if sess.Private() {
sessions = append(sessions, &s.sessionImpl)
} else if len(s.sessCreatorNames) > 0 {
// No private session yet, render session creators:
nameTexts = nameTexts[:0]
for name, text := range s.sessCreatorNames {
nameTexts = append(nameTexts, [2]string{name, text})
}
addLinks("Session creators:", nameTexts)
}
for _, session := range sessions {
text := "Public windows:"
if session.Private() {
text = "Authenticated windows:"
}
nameTexts = nameTexts[:0]
for _, win := range session.SortedWins() {
nameTexts = append(nameTexts, [2]string{win.Name(), win.Text()})
}
addLinks(text, nameTexts)
}
win.RenderWin(NewWriter(wr), s)
}
// renderComp renders just a component.
func (s *serverImpl) renderComp(win Window, w http.ResponseWriter, r *http.Request) {
id, err := AtoID(r.FormValue(paramCompID))
if err != nil {
http.Error(w, "Invalid component id!", http.StatusBadRequest)
return
}
if s.logger != nil {
s.logger.Println("\tRendering comp:", id)
}
comp := win.ByID(id)
if comp == nil {
http.Error(w, fmt.Sprint("Component not found: ", id), http.StatusBadRequest)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8") // We send it as text!
comp.Render(NewWriter(w))
}
// handleEvent handles the event dispatching.
func (s *serverImpl) handleEvent(sess Session, win Window, wr http.ResponseWriter, r *http.Request) {
focCompID, err := AtoID(r.FormValue(paramFocusedCompID))
if err == nil {
win.SetFocusedCompID(focCompID)
}
id, err := AtoID(r.FormValue(paramCompID))
if err != nil {
http.Error(wr, "Invalid component id!", http.StatusBadRequest)
return
}
comp := win.ByID(id)
if comp == nil {
if s.logger != nil {
s.logger.Println("\tComp not found:", id)
}
http.Error(wr, fmt.Sprint("Component not found: ", id), http.StatusBadRequest)
return
}
etype := parseIntParam(r, paramEventType)
if etype < 0 {
http.Error(wr, "Invalid event type!", http.StatusBadRequest)
return
}
if s.logger != nil {
s.logger.Println("\tEvent from comp:", id, " event:", etype)
}
event := newEventImpl(EventType(etype), comp, s, sess, wr, r)
shared := event.shared
event.x = parseIntParam(r, paramMouseX)
if event.x >= 0 {
event.y = parseIntParam(r, paramMouseY)
shared.wx = parseIntParam(r, paramMouseWX)
shared.wy = parseIntParam(r, paramMouseWY)
shared.mbtn = MouseBtn(parseIntParam(r, paramMouseBtn))
} else {
event.y, shared.wx, shared.wy, shared.mbtn = -1, -1, -1, -1
}
shared.modKeys = parseIntParam(r, paramModKeys)
shared.keyCode = Key(parseIntParam(r, paramKeyCode))
comp.preprocessEvent(event, r)
// Dispatch event...
comp.dispatchEvent(event)
// Check if a new session was created during event dispatching
if shared.session.New() {
s.addSessCookie(shared.session, wr)
}
// ...and send back the result
wr.Header().Set("Content-Type", "text/plain; charset=utf-8") // We send it as text
w := NewWriter(wr)
hasAction := false
// If we reload, nothing else matters
if shared.reload {
hasAction = true
w.Writevs(eraReloadWin, strComma, shared.reloadWin)
} else {
if len(shared.dirtyComps) > 0 {
hasAction = true
w.Writev(eraDirtyComps)
for id := range shared.dirtyComps {
w.Write(strComma)
w.Writev(int(id))
}
}
if shared.focusedComp != nil {
if hasAction {
w.Write(strSemicol)
} else {
hasAction = true
}
w.Writevs(eraFocusComp, strComma, int(shared.focusedComp.ID()))
// Also register focusable comp at window
win.SetFocusedCompID(shared.focusedComp.ID())
}
}
if !hasAction {
w.Writev(eraNoAction)
}
}
// parseIntParam parses an int param.
// If error occurs, -1 will be returned.
func parseIntParam(r *http.Request, paramName string) int {
if num, err := strconv.Atoi(r.FormValue(paramName)); err == nil {
return num
}
return -1
}