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 archiveHandler(w http.ResponseWriter, r *http.Request) {
264 authd, authUser, _ := getAuthUser(r)
265 if !authd {
266 renderDefaultError(w, http.StatusForbidden)
267 return
268 }
269 if r.Method == "GET" {
270 userFolder := filepath.Join(c.FilesDirectory, filepath.Clean(authUser))
271 err := zipit(userFolder, w)
272 if err != nil {
273 log.Println(err)
274 renderDefaultError(w, http.StatusInternalServerError)
275 return
276 }
277
278 }
279}
280func loginHandler(w http.ResponseWriter, r *http.Request) {
281 if r.Method == "GET" {
282 // show page
283 data := struct {
284 Error string
285 PageTitle string
286 }{"", "Login"}
287 err := t.ExecuteTemplate(w, "login.html", data)
288 if err != nil {
289 log.Println(err)
290 renderDefaultError(w, http.StatusInternalServerError)
291 return
292 }
293 } else if r.Method == "POST" {
294 r.ParseForm()
295 name := r.Form.Get("username")
296 password := r.Form.Get("password")
297 row := DB.QueryRow("SELECT username, password_hash, active, admin FROM user where username = $1 OR email = $1", name)
298 var db_password []byte
299 var username string
300 var active bool
301 var isAdmin bool
302 _ = row.Scan(&username, &db_password, &active, &isAdmin)
303 if db_password != nil && !active {
304 data := struct {
305 Error string
306 PageTitle string
307 }{"Your account is not active yet. Pending admin approval", c.SiteTitle}
308 t.ExecuteTemplate(w, "login.html", data)
309 return
310 }
311 if bcrypt.CompareHashAndPassword(db_password, []byte(password)) == nil {
312 log.Println("logged in")
313 session, _ := SessionStore.Get(r, "cookie-session")
314 session.Values["auth_user"] = username
315 session.Values["admin"] = isAdmin
316 session.Save(r, w)
317 http.Redirect(w, r, "/my_site", http.StatusSeeOther)
318 } else {
319 data := struct {
320 Error string
321 PageTitle string
322 }{"Invalid login or password", c.SiteTitle}
323 err := t.ExecuteTemplate(w, "login.html", data)
324 if err != nil {
325 log.Println(err)
326 renderDefaultError(w, http.StatusInternalServerError)
327 return
328 }
329 }
330 }
331}
332
333func logoutHandler(w http.ResponseWriter, r *http.Request) {
334 session, _ := SessionStore.Get(r, "cookie-session")
335 session.Options.MaxAge = -1
336 session.Save(r, w)
337 http.Redirect(w, r, "/", http.StatusSeeOther)
338}
339
340const ok = "-0123456789abcdefghijklmnopqrstuvwxyz"
341
342func isOkUsername(s string) bool {
343 if len(s) < 1 {
344 return false
345 }
346 if len(s) > 31 {
347 return false
348 }
349 for _, char := range s {
350 if !strings.Contains(ok, strings.ToLower(string(char))) {
351 return false
352 }
353 }
354 return true
355}
356func registerHandler(w http.ResponseWriter, r *http.Request) {
357 if r.Method == "GET" {
358 data := struct {
359 Host string
360 Errors []string
361 PageTitle string
362 }{c.Host, nil, "Register"}
363 err := t.ExecuteTemplate(w, "register.html", data)
364 if err != nil {
365 log.Println(err)
366 renderDefaultError(w, http.StatusInternalServerError)
367 return
368 }
369 } else if r.Method == "POST" {
370 r.ParseForm()
371 email := r.Form.Get("email")
372 password := r.Form.Get("password")
373 errors := []string{}
374 if !strings.Contains(email, "@") {
375 errors = append(errors, "Invalid Email")
376 }
377 if r.Form.Get("password") != r.Form.Get("password2") {
378 errors = append(errors, "Passwords don't match")
379 }
380 if len(password) < 6 {
381 errors = append(errors, "Password is too short")
382 }
383 username := strings.ToLower(r.Form.Get("username"))
384 if !isOkUsername(username) {
385 errors = append(errors, "Username is invalid: can only contain letters, numbers and hypens. Maximum 32 characters.")
386 }
387 hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 8) // TODO handle error
388 reference := r.Form.Get("reference")
389 if len(errors) == 0 {
390 _, err = DB.Exec("insert into user (username, email, password_hash, reference) values ($1, $2, $3, $4)", username, email, string(hashedPassword), reference)
391 if err != nil {
392 log.Println(err)
393 errors = append(errors, "Username or email is already used")
394 }
395 }
396 if len(errors) > 0 {
397 data := struct {
398 Host string
399 Errors []string
400 PageTitle string
401 }{c.Host, errors, "Register"}
402 t.ExecuteTemplate(w, "register.html", data)
403 } else {
404 data := struct {
405 Host string
406 Message string
407 PageTitle string
408 }{c.Host, "Registration complete! The server admin will approve your request before you can log in.", "Registration Complete"}
409 t.ExecuteTemplate(w, "message.html", data)
410 }
411 }
412}
413
414func adminHandler(w http.ResponseWriter, r *http.Request) {
415 _, _, isAdmin := getAuthUser(r)
416 if !isAdmin {
417 renderDefaultError(w, http.StatusForbidden)
418 return
419 }
420 allUsers, err := getUsers()
421 if err != nil {
422 log.Println(err)
423 renderDefaultError(w, http.StatusInternalServerError)
424 return
425 }
426 data := struct {
427 Users []User
428 LoggedIn bool
429 IsAdmin bool
430 PageTitle string
431 Host string
432 }{allUsers, true, true, "Admin", c.Host}
433 err = t.ExecuteTemplate(w, "admin.html", data)
434 if err != nil {
435 log.Println(err)
436 renderDefaultError(w, http.StatusInternalServerError)
437 return
438 }
439}
440
441func getFavicon(user string) string {
442 faviconPath := path.Join(c.FilesDirectory, filepath.Clean(user), "favicon.txt")
443 content, err := ioutil.ReadFile(faviconPath)
444 if err != nil {
445 return ""
446 }
447 strcontent := []rune(string(content))
448 if len(strcontent) > 0 {
449 return string(strcontent[0])
450 }
451 return ""
452}
453
454// Server a user's file
455func userFile(w http.ResponseWriter, r *http.Request) {
456 userName := filepath.Clean(strings.Split(r.Host, ".")[0]) // Clean probably unnecessary
457 p := filepath.Clean(r.URL.Path)
458 var isDir bool
459 fileName := path.Join(c.FilesDirectory, userName, p)
460 stat, err := os.Stat(fileName)
461 if stat != nil {
462 isDir = stat.IsDir()
463 }
464 if p == "/" || isDir {
465 fileName = path.Join(fileName, "index.gmi")
466 }
467
468 if strings.HasPrefix(p, "/.hidden") {
469 renderDefaultError(w, http.StatusForbidden)
470 return
471 }
472 if r.URL.Path == "/style.css" {
473 http.ServeFile(w, r, path.Join(c.TemplatesDirectory, "static/style.css"))
474 return
475 }
476
477 _, err = os.Stat(fileName)
478 if os.IsNotExist(err) {
479 renderDefaultError(w, http.StatusNotFound)
480 return
481 }
482
483 // Dumb content negotiation
484 extension := path.Ext(fileName)
485 _, raw := r.URL.Query()["raw"]
486 acceptsGemini := strings.Contains(r.Header.Get("Accept"), "text/gemini")
487 if !raw && !acceptsGemini && (extension == ".gmi" || extension == ".gemini") {
488 file, _ := os.Open(fileName)
489 htmlString := textToHTML(gmi.ParseText(file))
490 favicon := getFavicon(userName)
491 data := struct {
492 SiteBody template.HTML
493 Favicon string
494 PageTitle string
495 }{template.HTML(htmlString), favicon, userName + p}
496 t.ExecuteTemplate(w, "user_page.html", data)
497 } else {
498 http.ServeFile(w, r, fileName)
499 }
500}
501
502func adminUserHandler(w http.ResponseWriter, r *http.Request) {
503 _, _, isAdmin := getAuthUser(r)
504 if r.Method == "POST" {
505 if !isAdmin {
506 renderDefaultError(w, http.StatusForbidden)
507 return
508 }
509 components := strings.Split(r.URL.Path, "/")
510 if len(components) < 5 {
511 renderError(w, "Invalid action", http.StatusBadRequest)
512 return
513 }
514 userName := components[3]
515 action := components[4]
516 var err error
517 if action == "activate" {
518 err = activateUser(userName)
519 } else if action == "delete" {
520 err = deleteUser(userName)
521 }
522 if err != nil {
523 log.Println(err)
524 renderDefaultError(w, http.StatusInternalServerError)
525 return
526 }
527 http.Redirect(w, r, "/admin", http.StatusSeeOther)
528 }
529}
530
531func runHTTPServer() {
532 log.Printf("Running http server with hostname %s on port %d. TLS enabled: %t", c.Host, c.HttpPort, c.HttpsEnabled)
533 var err error
534 t, err = template.ParseGlob(path.Join(c.TemplatesDirectory, "*.html"))
535 if err != nil {
536 log.Fatal(err)
537 }
538 serveMux := http.NewServeMux()
539
540 s := strings.SplitN(c.Host, ":", 2)
541 hostname := s[0]
542 port := c.HttpPort
543
544 serveMux.HandleFunc(hostname+"/", rootHandler)
545 serveMux.HandleFunc(hostname+"/my_site", mySiteHandler)
546 serveMux.HandleFunc(hostname+"/my_site/flounder-archive.zip", archiveHandler)
547 serveMux.HandleFunc(hostname+"/admin", adminHandler)
548 serveMux.HandleFunc(hostname+"/edit/", editFileHandler)
549 serveMux.HandleFunc(hostname+"/upload", uploadFilesHandler)
550 serveMux.HandleFunc(hostname+"/login", loginHandler)
551 serveMux.HandleFunc(hostname+"/logout", logoutHandler)
552 serveMux.HandleFunc(hostname+"/register", registerHandler)
553 serveMux.HandleFunc(hostname+"/delete/", deleteFileHandler)
554
555 // admin commands
556 serveMux.HandleFunc(hostname+"/admin/user/", adminUserHandler)
557
558 // TODO rate limit login https://github.com/ulule/limiter
559
560 wrapped := handlers.LoggingHandler(log.Writer(), serveMux)
561
562 // handle user files based on subdomain
563 serveMux.HandleFunc("/", userFile)
564 // login+register functions
565 srv := &http.Server{
566 ReadTimeout: 5 * time.Second,
567 WriteTimeout: 10 * time.Second,
568 IdleTimeout: 120 * time.Second,
569 Addr: fmt.Sprintf(":%d", port),
570 // TLSConfig: tlsConfig,
571 Handler: wrapped,
572 }
573 if c.HttpsEnabled {
574 log.Fatal(srv.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile))
575 } else {
576 log.Fatal(srv.ListenAndServe())
577 }
578}