http.go (view raw)
1package main
2
3import (
4 "bytes"
5 "database/sql"
6 "fmt"
7 gmi "git.sr.ht/~adnano/go-gemini"
8 "github.com/gorilla/handlers"
9 "github.com/gorilla/sessions"
10 _ "github.com/mattn/go-sqlite3"
11 "golang.org/x/crypto/bcrypt"
12 "html/template"
13 "io"
14 "io/ioutil"
15 "log"
16 "mime"
17 "net/http"
18 "os"
19 "path"
20 "path/filepath"
21 "strings"
22 "time"
23)
24
25var t *template.Template
26var DB *sql.DB
27var SessionStore *sessions.CookieStore
28
29func renderDefaultError(w http.ResponseWriter, statusCode int) {
30 errorMsg := http.StatusText(statusCode)
31 renderError(w, errorMsg, statusCode)
32}
33
34func renderError(w http.ResponseWriter, errorMsg string, statusCode int) {
35 data := struct {
36 PageTitle string
37 StatusCode int
38 ErrorMsg string
39 }{"Error!", statusCode, errorMsg}
40 err := t.ExecuteTemplate(w, "error.html", data)
41 if err != nil { // Shouldn't happen probably
42 http.Error(w, errorMsg, statusCode)
43 }
44}
45
46func rootHandler(w http.ResponseWriter, r *http.Request) {
47 // serve everything inside static directory
48 if r.URL.Path != "/" {
49 fileName := path.Join(c.TemplatesDirectory, "static", filepath.Clean(r.URL.Path))
50 _, err := os.Stat(fileName)
51 if err != nil {
52 renderDefaultError(w, http.StatusNotFound)
53 return
54 }
55 http.ServeFile(w, r, fileName) // TODO better error handling
56 return
57 }
58
59 user := newGetAuthUser(r)
60 indexFiles, err := getIndexFiles(user.IsAdmin)
61 if err != nil {
62 panic(err)
63 }
64 allUsers, err := getActiveUserNames()
65 if err != nil {
66 panic(err)
67 }
68 data := struct {
69 Host string
70 PageTitle string
71 Files []*File
72 Users []string
73 AuthUser AuthUser
74 }{c.Host, c.SiteTitle, indexFiles, allUsers, user}
75 err = t.ExecuteTemplate(w, "index.html", data)
76 if err != nil {
77 panic(err)
78 }
79}
80
81func editFileHandler(w http.ResponseWriter, r *http.Request) {
82 user := newGetAuthUser(r)
83 if !user.LoggedIn {
84 renderDefaultError(w, http.StatusForbidden)
85 return
86 }
87 fileName := filepath.Clean(r.URL.Path[len("/edit/"):])
88 isText := strings.HasPrefix(mime.TypeByExtension(path.Ext(fileName)), "text")
89 filePath := path.Join(c.FilesDirectory, user.Username, fileName)
90
91 if r.Method == "GET" {
92 err := checkIfValidFile(filePath, nil)
93 if err != nil {
94 log.Println(err)
95 renderError(w, err.Error(), http.StatusBadRequest)
96 return
97 }
98 // Create directories if dne
99 f, err := os.OpenFile(filePath, os.O_RDONLY, 0644)
100 var fileBytes []byte
101 if os.IsNotExist(err) || !isText {
102 fileBytes = []byte{}
103 err = nil
104 } else {
105 defer f.Close()
106 fileBytes, err = ioutil.ReadAll(f)
107 }
108 if err != nil {
109 panic(err)
110 }
111 data := struct {
112 FileName string
113 FileText string
114 PageTitle string
115 AuthUser AuthUser
116 Host string
117 IsText bool
118 }{fileName, string(fileBytes), c.SiteTitle, user, c.Host, isText}
119 err = t.ExecuteTemplate(w, "edit_file.html", data)
120 if err != nil {
121 panic(err)
122 }
123 } else if r.Method == "POST" {
124 // get post body
125 r.ParseForm()
126 fileText := r.Form.Get("file_text")
127 // Web form by default gives us CR LF newlines.
128 // Unix files use just LF
129 fileText = strings.ReplaceAll(fileText, "\r\n", "\n")
130 fileBytes := []byte(fileText)
131 err := checkIfValidFile(filePath, fileBytes)
132 if err != nil {
133 log.Println(err)
134 renderError(w, err.Error(), http.StatusBadRequest)
135 return
136 }
137 // create directories if dne
138 os.MkdirAll(path.Dir(filePath), os.ModePerm)
139 if userHasSpace(user.Username, len(fileBytes)) {
140 if isText { // Cant edit binary files here
141 err = ioutil.WriteFile(filePath, fileBytes, 0644)
142 }
143 } else {
144 renderError(w, fmt.Sprintf("Bad Request: Out of file space. Max space: %d.", c.MaxUserBytes), http.StatusBadRequest)
145 return
146 }
147 if err != nil {
148 panic(err)
149 }
150 newName := filepath.Clean(r.Form.Get("rename"))
151 err = checkIfValidFile(newName, fileBytes)
152 if err != nil {
153 log.Println(err)
154 renderError(w, err.Error(), http.StatusBadRequest)
155 return
156 }
157 if newName != fileName {
158 newPath := path.Join(c.FilesDirectory, user.Username, newName)
159 os.MkdirAll(path.Dir(newPath), os.ModePerm)
160 os.Rename(filePath, newPath)
161 fileName = newName
162 }
163 http.Redirect(w, r, path.Join("/edit", fileName), http.StatusSeeOther)
164 }
165}
166
167func uploadFilesHandler(w http.ResponseWriter, r *http.Request) {
168 if r.Method == "POST" {
169 user := newGetAuthUser(r)
170 if !user.LoggedIn {
171 renderDefaultError(w, http.StatusForbidden)
172 return
173 }
174 r.ParseMultipartForm(10 << 6) // why does this not work
175 file, fileHeader, err := r.FormFile("file")
176 fileName := filepath.Clean(fileHeader.Filename)
177 defer file.Close()
178 if err != nil {
179 log.Println(err)
180 renderError(w, err.Error(), http.StatusBadRequest)
181 return
182 }
183 dest, _ := ioutil.ReadAll(file)
184 err = checkIfValidFile(fileName, dest)
185 if err != nil {
186 log.Println(err)
187 renderError(w, err.Error(), http.StatusBadRequest)
188 return
189 }
190 destPath := path.Join(c.FilesDirectory, user.Username, fileName)
191
192 f, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE, 0644)
193 if err != nil {
194 panic(err)
195 }
196 defer f.Close()
197 if userHasSpace(user.Username, c.MaxFileBytes) { // Not quite right
198 io.Copy(f, bytes.NewReader(dest))
199 } else {
200 renderError(w, fmt.Sprintf("Bad Request: Out of file space. Max space: %d.", c.MaxUserBytes), http.StatusBadRequest)
201 return
202 }
203 }
204 http.Redirect(w, r, "/my_site", http.StatusSeeOther)
205}
206
207// TODO use this
208type AuthUser struct {
209 LoggedIn bool
210 Username string
211 IsAdmin bool
212 ImpersonatingUser string // used if impersonating
213}
214
215func newGetAuthUser(r *http.Request) AuthUser {
216 session, _ := SessionStore.Get(r, "cookie-session")
217 user, ok := session.Values["auth_user"].(string)
218 impers, _ := session.Values["impersonating_user"].(string)
219 isAdmin, _ := session.Values["admin"].(bool)
220 return AuthUser{
221 LoggedIn: ok,
222 Username: user,
223 IsAdmin: isAdmin,
224 ImpersonatingUser: impers,
225 }
226}
227
228func mySiteHandler(w http.ResponseWriter, r *http.Request) {
229 user := newGetAuthUser(r)
230 if !user.LoggedIn {
231 renderDefaultError(w, http.StatusForbidden)
232 return
233 }
234 // check auth
235 userFolder := getUserDirectory(user.Username)
236 files, _ := getMyFilesRecursive(userFolder, user.Username)
237 data := struct {
238 Host string
239 PageTitle string
240 Files []*File
241 AuthUser AuthUser
242 }{c.Host, c.SiteTitle, files, user}
243 _ = t.ExecuteTemplate(w, "my_site.html", data)
244}
245
246func myAccountHandler(w http.ResponseWriter, r *http.Request) {
247 user := newGetAuthUser(r)
248 authUser := user.Username
249 if !user.LoggedIn {
250 renderDefaultError(w, http.StatusForbidden)
251 return
252 }
253 me, _ := getUserByName(user.Username)
254 type pageData struct {
255 PageTitle string
256 AuthUser AuthUser
257 Email string
258 Errors []string
259 }
260 data := pageData{"My Account", user, me.Email, nil}
261
262 if r.Method == "GET" {
263 err := t.ExecuteTemplate(w, "me.html", data)
264 if err != nil {
265 panic(err)
266 }
267 } else if r.Method == "POST" {
268 r.ParseForm()
269 newUsername := r.Form.Get("username")
270 errors := []string{}
271 newEmail := r.Form.Get("email")
272 newUsername = strings.ToLower(newUsername)
273 var err error
274 if newEmail != me.Email {
275 _, err = DB.Exec("update user set email = ? where username = ?", newEmail, me.Email)
276 if err != nil {
277 // TODO better error not sql
278 errors = append(errors, err.Error())
279 } else {
280 log.Printf("Changed email for %s from %s to %s", authUser, me.Email, newEmail)
281 }
282 }
283 if newUsername != authUser {
284 // Rename User
285 err = renameUser(authUser, newUsername)
286 if err != nil {
287 errors = append(errors, err.Error())
288 } else {
289 session, _ := SessionStore.Get(r, "cookie-session")
290 session.Values["auth_user"] = newUsername
291 session.Save(r, w)
292 }
293 }
294 // reset auth
295 user = newGetAuthUser(r)
296 data.Errors = errors
297 data.AuthUser = user
298 data.Email = newEmail
299 _ = t.ExecuteTemplate(w, "me.html", data)
300 }
301}
302
303func archiveHandler(w http.ResponseWriter, r *http.Request) {
304 authUser := newGetAuthUser(r)
305 if !authUser.LoggedIn {
306 renderDefaultError(w, http.StatusForbidden)
307 return
308 }
309 if r.Method == "GET" {
310 userFolder := getUserDirectory(authUser.Username)
311 err := zipit(userFolder, w)
312 if err != nil {
313 panic(err)
314 }
315
316 }
317}
318func loginHandler(w http.ResponseWriter, r *http.Request) {
319 if r.Method == "GET" {
320 // show page
321 data := struct {
322 Error string
323 PageTitle string
324 }{"", "Login"}
325 err := t.ExecuteTemplate(w, "login.html", data)
326 if err != nil {
327 panic(err)
328 }
329 } else if r.Method == "POST" {
330 r.ParseForm()
331 name := r.Form.Get("username")
332 password := r.Form.Get("password")
333 row := DB.QueryRow("SELECT username, password_hash, active, admin FROM user where username = $1 OR email = $1", name)
334 var db_password []byte
335 var username string
336 var active bool
337 var isAdmin bool
338 _ = row.Scan(&username, &db_password, &active, &isAdmin)
339 if db_password != nil && !active {
340 data := struct {
341 Error string
342 PageTitle string
343 }{"Your account is not active yet. Pending admin approval", c.SiteTitle}
344 t.ExecuteTemplate(w, "login.html", data)
345 return
346 }
347 if bcrypt.CompareHashAndPassword(db_password, []byte(password)) == nil {
348 log.Println("logged in")
349 session, _ := SessionStore.Get(r, "cookie-session")
350 session.Values["auth_user"] = username
351 session.Values["admin"] = isAdmin
352 session.Save(r, w)
353 http.Redirect(w, r, "/my_site", http.StatusSeeOther)
354 } else {
355 data := struct {
356 Error string
357 PageTitle string
358 }{"Invalid login or password", c.SiteTitle}
359 err := t.ExecuteTemplate(w, "login.html", data)
360 if err != nil {
361 panic(err)
362 }
363 }
364 }
365}
366
367func logoutHandler(w http.ResponseWriter, r *http.Request) {
368 session, _ := SessionStore.Get(r, "cookie-session")
369 impers, ok := session.Values["impersonating_user"].(string)
370 if ok {
371 session.Values["auth_user"] = impers
372 session.Values["impersonating_user"] = nil // TODO expire this automatically
373 // session.Values["admin"] = nil // TODO fix admin
374 } else {
375 session.Options.MaxAge = -1
376 }
377 session.Save(r, w)
378 http.Redirect(w, r, "/", http.StatusSeeOther)
379}
380
381const ok = "-0123456789abcdefghijklmnopqrstuvwxyz"
382
383func isOkUsername(s string) error {
384 if len(s) < 1 {
385 return fmt.Errorf("Username is too short")
386 }
387 if len(s) > 32 {
388 return fmt.Errorf("Username is too long. 32 char max.")
389 }
390 for _, char := range s {
391 if !strings.Contains(ok, strings.ToLower(string(char))) {
392 return fmt.Errorf("Username contains invalid characters. Valid characters include lowercase letters, numbers, and hyphens.")
393 }
394 }
395 return nil
396}
397func registerHandler(w http.ResponseWriter, r *http.Request) {
398 if r.Method == "GET" {
399 data := struct {
400 Host string
401 Errors []string
402 PageTitle string
403 }{c.Host, nil, "Register"}
404 err := t.ExecuteTemplate(w, "register.html", data)
405 if err != nil {
406 panic(err)
407 }
408 } else if r.Method == "POST" {
409 r.ParseForm()
410 email := r.Form.Get("email")
411 password := r.Form.Get("password")
412 errors := []string{}
413 if r.Form.Get("password") != r.Form.Get("password2") {
414 errors = append(errors, "Passwords don't match")
415 }
416 if len(password) < 6 {
417 errors = append(errors, "Password is too short")
418 }
419 username := strings.ToLower(r.Form.Get("username"))
420 err := isOkUsername(username)
421 if err != nil {
422 errors = append(errors, err.Error())
423 }
424 hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 8) // TODO handle error
425 reference := r.Form.Get("reference")
426 if len(errors) == 0 {
427 _, err = DB.Exec("insert into user (username, email, password_hash, reference) values ($1, $2, $3, $4)", username, email, string(hashedPassword), reference)
428 if err != nil {
429 errors = append(errors, "Username or email is already used")
430 }
431 }
432 if len(errors) > 0 {
433 data := struct {
434 Host string
435 Errors []string
436 PageTitle string
437 }{c.Host, errors, "Register"}
438 t.ExecuteTemplate(w, "register.html", data)
439 } else {
440 data := struct {
441 Host string
442 Message string
443 PageTitle string
444 }{c.Host, "Registration complete! The server admin will approve your request before you can log in.", "Registration Complete"}
445 t.ExecuteTemplate(w, "message.html", data)
446 }
447 }
448}
449
450func deleteFileHandler(w http.ResponseWriter, r *http.Request) {
451 user := newGetAuthUser(r)
452 if !user.LoggedIn {
453 renderDefaultError(w, http.StatusForbidden)
454 return
455 }
456 filePath := safeGetFilePath(user.Username, r.URL.Path[len("/delete/"):])
457 if r.Method == "POST" {
458 os.Remove(filePath) // TODO handle error
459 }
460 http.Redirect(w, r, "/my_site", http.StatusSeeOther)
461}
462
463func adminHandler(w http.ResponseWriter, r *http.Request) {
464 user := newGetAuthUser(r)
465 if !user.IsAdmin {
466 renderDefaultError(w, http.StatusForbidden)
467 return
468 }
469 allUsers, err := getUsers()
470 if err != nil {
471 log.Println(err)
472 renderDefaultError(w, http.StatusInternalServerError)
473 return
474 }
475 data := struct {
476 Users []User
477 AuthUser AuthUser
478 PageTitle string
479 Host string
480 }{allUsers, user, "Admin", c.Host}
481 err = t.ExecuteTemplate(w, "admin.html", data)
482 if err != nil {
483 panic(err)
484 }
485}
486
487func getFavicon(user string) string {
488 faviconPath := path.Join(c.FilesDirectory, filepath.Clean(user), "favicon.txt")
489 content, err := ioutil.ReadFile(faviconPath)
490 if err != nil {
491 return ""
492 }
493 strcontent := []rune(string(content))
494 if len(strcontent) > 0 {
495 return string(strcontent[0])
496 }
497 return ""
498}
499
500// Server a user's file
501func userFile(w http.ResponseWriter, r *http.Request) {
502 userName := filepath.Clean(strings.Split(r.Host, ".")[0]) // Clean probably unnecessary
503 p := filepath.Clean(r.URL.Path)
504 var isDir bool
505 fileName := path.Join(c.FilesDirectory, userName, p)
506 stat, err := os.Stat(fileName)
507 if stat != nil {
508 isDir = stat.IsDir()
509 }
510 if p == "/" || isDir {
511 fileName = path.Join(fileName, "index.gmi")
512 }
513
514 if strings.HasPrefix(p, "/.hidden") {
515 renderDefaultError(w, http.StatusForbidden)
516 return
517 }
518 if r.URL.Path == "/style.css" {
519 http.ServeFile(w, r, path.Join(c.TemplatesDirectory, "static/style.css"))
520 return
521 }
522
523 _, err = os.Stat(fileName)
524 if os.IsNotExist(err) {
525 renderDefaultError(w, http.StatusNotFound)
526 return
527 }
528
529 // Dumb content negotiation
530 extension := path.Ext(fileName)
531 _, raw := r.URL.Query()["raw"]
532 acceptsGemini := strings.Contains(r.Header.Get("Accept"), "text/gemini")
533 if !raw && !acceptsGemini && (extension == ".gmi" || extension == ".gemini") {
534 file, _ := os.Open(fileName)
535 htmlString := textToHTML(gmi.ParseText(file))
536 favicon := getFavicon(userName)
537 data := struct {
538 SiteBody template.HTML
539 Favicon string
540 PageTitle string
541 }{template.HTML(htmlString), favicon, userName + p}
542 t.ExecuteTemplate(w, "user_page.html", data)
543 } else {
544 http.ServeFile(w, r, fileName)
545 }
546}
547
548func deleteAccountHandler(w http.ResponseWriter, r *http.Request) {
549 user := newGetAuthUser(r)
550 if r.Method == "POST" {
551 err := deleteUser(user.Username)
552 if err != nil {
553 log.Println(err)
554 renderDefaultError(w, http.StatusInternalServerError)
555 return
556 }
557 logoutHandler(w, r)
558 }
559}
560
561func resetPasswordHandler(w http.ResponseWriter, r *http.Request) {
562}
563
564func adminUserHandler(w http.ResponseWriter, r *http.Request) {
565 user := newGetAuthUser(r)
566 if r.Method == "POST" {
567 if !user.IsAdmin {
568 renderDefaultError(w, http.StatusForbidden)
569 return
570 }
571 components := strings.Split(r.URL.Path, "/")
572 if len(components) < 5 {
573 renderError(w, "Invalid action", http.StatusBadRequest)
574 return
575 }
576 userName := components[3]
577 action := components[4]
578 var err error
579 if action == "activate" {
580 err = activateUser(userName)
581 } else if action == "impersonate" {
582 session, _ := SessionStore.Get(r, "cookie-session")
583 session.Values["auth_user"] = userName
584 session.Values["impersonating_user"] = user.Username
585 session.Save(r, w)
586 log.Printf("User %s impersonated %s", user.Username, userName)
587 http.Redirect(w, r, "/", http.StatusSeeOther)
588 return
589 }
590 if err != nil {
591 log.Println(err)
592 renderDefaultError(w, http.StatusInternalServerError)
593 return
594 }
595 http.Redirect(w, r, "/admin", http.StatusSeeOther)
596 }
597}
598
599func runHTTPServer() {
600 log.Printf("Running http server with hostname %s on port %d. TLS enabled: %t", c.Host, c.HttpPort, c.HttpsEnabled)
601 var err error
602 t, err = template.ParseGlob(path.Join(c.TemplatesDirectory, "*.html"))
603 if err != nil {
604 log.Fatal(err)
605 }
606 serveMux := http.NewServeMux()
607
608 s := strings.SplitN(c.Host, ":", 2)
609 hostname := s[0]
610 port := c.HttpPort
611
612 serveMux.HandleFunc(hostname+"/", rootHandler)
613 serveMux.HandleFunc(hostname+"/my_site", mySiteHandler)
614 serveMux.HandleFunc(hostname+"/me", myAccountHandler)
615 serveMux.HandleFunc(hostname+"/my_site/flounder-archive.zip", archiveHandler)
616 serveMux.HandleFunc(hostname+"/admin", adminHandler)
617 serveMux.HandleFunc(hostname+"/edit/", editFileHandler)
618 serveMux.HandleFunc(hostname+"/upload", uploadFilesHandler)
619 serveMux.Handle(hostname+"/login", limit(http.HandlerFunc(loginHandler)))
620 serveMux.Handle(hostname+"/register", limit(http.HandlerFunc(registerHandler)))
621 serveMux.HandleFunc(hostname+"/logout", logoutHandler)
622 serveMux.HandleFunc(hostname+"/delete/", deleteFileHandler)
623 serveMux.HandleFunc(hostname+"/delete-account", deleteAccountHandler)
624 serveMux.HandleFunc(hostname+"/reset-password", resetPasswordHandler)
625
626 // admin commands
627 serveMux.HandleFunc(hostname+"/admin/user/", adminUserHandler)
628
629 // TODO rate limit login https://github.com/ulule/limiter
630
631 wrapped := (handlers.LoggingHandler(log.Writer(), handlers.RecoveryHandler()(serveMux)))
632
633 // handle user files based on subdomain
634 serveMux.HandleFunc("/", userFile)
635 // login+register functions
636 srv := &http.Server{
637 ReadTimeout: 5 * time.Second,
638 WriteTimeout: 10 * time.Second,
639 IdleTimeout: 120 * time.Second,
640 Addr: fmt.Sprintf(":%d", port),
641 // TLSConfig: tlsConfig,
642 Handler: wrapped,
643 }
644 if c.HttpsEnabled {
645 log.Fatal(srv.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile))
646 } else {
647 log.Fatal(srv.ListenAndServe())
648 }
649}