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