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
29const InternalServerErrorMsg = "500: Internal Server Error"
30
31func renderError(w http.ResponseWriter, errorMsg string, statusCode int) {
32 data := struct {
33 PageTitle string
34 ErrorMsg string
35 }{"Error!", errorMsg}
36 err := t.ExecuteTemplate(w, "error.html", data)
37 if err != nil { // shouldn't happen probably
38 http.Error(w, errorMsg, statusCode)
39 }
40}
41
42func rootHandler(w http.ResponseWriter, r *http.Request) {
43 // serve everything inside static directory
44 if r.URL.Path != "/" {
45 fileName := path.Join(c.TemplatesDirectory, "static", filepath.Clean(r.URL.Path))
46 http.ServeFile(w, r, fileName)
47 return
48 }
49 authd, _, isAdmin := getAuthUser(r)
50 indexFiles, err := getIndexFiles()
51 if err != nil {
52 log.Println(err)
53 renderError(w, InternalServerErrorMsg, 500)
54 return
55 }
56 allUsers, err := getActiveUserNames()
57 if err != nil {
58 log.Println(err)
59 renderError(w, InternalServerErrorMsg, 500)
60 return
61 }
62 data := struct {
63 Host string
64 PageTitle string
65 Files []*File
66 Users []string
67 LoggedIn bool
68 IsAdmin bool
69 }{c.Host, c.SiteTitle, indexFiles, allUsers, authd, isAdmin}
70 err = t.ExecuteTemplate(w, "index.html", data)
71 if err != nil {
72 log.Println(err)
73 renderError(w, InternalServerErrorMsg, 500)
74 return
75 }
76}
77
78func editFileHandler(w http.ResponseWriter, r *http.Request) {
79 session, _ := SessionStore.Get(r, "cookie-session")
80 authUser, ok := session.Values["auth_user"].(string)
81 if !ok {
82 renderError(w, "403: Forbidden", 403)
83 return
84 }
85 fileName := filepath.Clean(r.URL.Path[len("/edit/"):])
86 isText := strings.HasPrefix(mime.TypeByExtension(path.Ext(fileName)), "text")
87 if !isText {
88 renderError(w, "Not a text file, cannot be edited here", 400) // correct status code?
89 return
90 }
91 filePath := path.Join(c.FilesDirectory, authUser, fileName)
92
93 if r.Method == "GET" {
94 err := checkIfValidFile(filePath, nil)
95 if err != nil {
96 log.Println(err)
97 renderError(w, err.Error(), 400)
98 return
99 }
100 // create directories if dne
101 os.MkdirAll(path.Dir(filePath), os.ModePerm)
102 f, err := os.OpenFile(filePath, os.O_RDONLY|os.O_CREATE, 0644)
103 defer f.Close()
104 fileBytes, err := ioutil.ReadAll(f)
105 if err != nil {
106 log.Println(err)
107 renderError(w, InternalServerErrorMsg, 500)
108 return
109 }
110 data := struct {
111 FileName string
112 FileText string
113 PageTitle string
114 }{fileName, string(fileBytes), c.SiteTitle}
115 err = t.ExecuteTemplate(w, "edit_file.html", data)
116 if err != nil {
117 log.Println(err)
118 renderError(w, InternalServerErrorMsg, 500)
119 return
120 }
121 } else if r.Method == "POST" {
122 // get post body
123 r.ParseForm()
124 fileBytes := []byte(r.Form.Get("file_text"))
125 err := checkIfValidFile(filePath, fileBytes)
126 if err != nil {
127 log.Println(err)
128 renderError(w, err.Error(), 400)
129 return
130 }
131 // create directories if dne
132 os.MkdirAll(path.Dir(filePath), os.ModePerm)
133 err = ioutil.WriteFile(filePath, fileBytes, 0644)
134 if err != nil {
135 log.Println(err)
136 renderError(w, InternalServerErrorMsg, 500)
137 return
138 }
139 http.Redirect(w, r, "/my_site", 303)
140 }
141}
142
143func uploadFilesHandler(w http.ResponseWriter, r *http.Request) {
144 if r.Method == "POST" {
145 session, _ := SessionStore.Get(r, "cookie-session")
146 authUser, ok := session.Values["auth_user"].(string)
147 if !ok {
148 renderError(w, "403: Forbidden", 403)
149 return
150 }
151 r.ParseMultipartForm(10 << 6) // why does this not work
152 file, fileHeader, err := r.FormFile("file")
153 fileName := filepath.Clean(fileHeader.Filename)
154 defer file.Close()
155 if err != nil {
156 log.Println(err)
157 renderError(w, err.Error(), 400)
158 return
159 }
160 dest, _ := ioutil.ReadAll(file)
161 err = checkIfValidFile(fileName, dest)
162 if err != nil {
163 log.Println(err)
164 renderError(w, err.Error(), 400)
165 return
166 }
167 destPath := path.Join(c.FilesDirectory, authUser, fileName)
168
169 f, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE, 0644)
170 if err != nil {
171 log.Println(err)
172 renderError(w, InternalServerErrorMsg, 500)
173 return
174 }
175 defer f.Close()
176 io.Copy(f, bytes.NewReader(dest))
177 }
178 http.Redirect(w, r, "/my_site", 303)
179}
180
181// bool whether auth'd, string is auth user
182func getAuthUser(r *http.Request) (bool, string, bool) {
183 session, _ := SessionStore.Get(r, "cookie-session")
184 user, ok := session.Values["auth_user"].(string)
185 isAdmin, _ := session.Values["admin"].(bool)
186 return ok, user, isAdmin
187}
188func deleteFileHandler(w http.ResponseWriter, r *http.Request) {
189 authd, authUser, _ := getAuthUser(r)
190 if !authd {
191 renderError(w, "403: Forbidden", 403)
192 return
193 }
194 fileName := filepath.Clean(r.URL.Path[len("/delete/"):])
195 filePath := path.Join(c.FilesDirectory, authUser, fileName)
196 if r.Method == "POST" {
197 os.Remove(filePath) // suppress error
198 }
199 http.Redirect(w, r, "/my_site", 303)
200}
201
202func mySiteHandler(w http.ResponseWriter, r *http.Request) {
203 authd, authUser, isAdmin := getAuthUser(r)
204 if !authd {
205 renderError(w, "403: Forbidden", 403)
206 return
207 }
208 // check auth
209 userFolder := path.Join(c.FilesDirectory, authUser)
210 files, _ := getMyFilesRecursive(userFolder, authUser)
211 data := struct {
212 Host string
213 PageTitle string
214 AuthUser string
215 Files []*File
216 LoggedIn bool
217 IsAdmin bool
218 }{c.Host, c.SiteTitle, authUser, files, authd, isAdmin}
219 _ = t.ExecuteTemplate(w, "my_site.html", data)
220}
221
222func archiveHandler(w http.ResponseWriter, r *http.Request) {
223 authd, authUser, _ := getAuthUser(r)
224 if !authd {
225 renderError(w, "403: Forbidden", 403)
226 return
227 }
228 if r.Method == "GET" {
229 userFolder := filepath.Join(c.FilesDirectory, filepath.Clean(authUser))
230 err := zipit(userFolder, w)
231 if err != nil {
232 log.Println(err)
233 renderError(w, InternalServerErrorMsg, 500)
234 return
235 }
236
237 }
238}
239func loginHandler(w http.ResponseWriter, r *http.Request) {
240 if r.Method == "GET" {
241 // show page
242 data := struct {
243 Error string
244 PageTitle string
245 }{"", "Login"}
246 err := t.ExecuteTemplate(w, "login.html", data)
247 if err != nil {
248 log.Println(err)
249 renderError(w, InternalServerErrorMsg, 500)
250 return
251 }
252 } else if r.Method == "POST" {
253 r.ParseForm()
254 name := r.Form.Get("username")
255 password := r.Form.Get("password")
256 row := DB.QueryRow("SELECT username, password_hash, active, admin FROM user where username = $1 OR email = $1", name)
257 var db_password []byte
258 var username string
259 var active bool
260 var isAdmin bool
261 _ = row.Scan(&username, &db_password, &active, &isAdmin)
262 if db_password != nil && !active {
263 data := struct {
264 Error string
265 PageTitle string
266 }{"Your account is not active yet. Pending admin approval", c.SiteTitle}
267 t.ExecuteTemplate(w, "login.html", data)
268 return
269 }
270 if bcrypt.CompareHashAndPassword(db_password, []byte(password)) == nil {
271 log.Println("logged in")
272 session, _ := SessionStore.Get(r, "cookie-session")
273 session.Values["auth_user"] = username
274 session.Values["admin"] = isAdmin
275 session.Save(r, w)
276 http.Redirect(w, r, "/my_site", 303)
277 } else {
278 data := struct {
279 Error string
280 PageTitle string
281 }{"Invalid login or password", c.SiteTitle}
282 err := t.ExecuteTemplate(w, "login.html", data)
283 if err != nil {
284 log.Println(err)
285 renderError(w, InternalServerErrorMsg, 500)
286 return
287 }
288 }
289 }
290}
291
292func logoutHandler(w http.ResponseWriter, r *http.Request) {
293 session, _ := SessionStore.Get(r, "cookie-session")
294 session.Options.MaxAge = -1
295 session.Save(r, w)
296 http.Redirect(w, r, "/", 303)
297}
298
299const ok = "-0123456789abcdefghijklmnopqrstuvwxyz"
300
301func isOkUsername(s string) bool {
302 if len(s) < 1 {
303 return false
304 }
305 if len(s) > 31 {
306 return false
307 }
308 for _, char := range s {
309 if !strings.Contains(ok, strings.ToLower(string(char))) {
310 return false
311 }
312 }
313 return true
314}
315func registerHandler(w http.ResponseWriter, r *http.Request) {
316 if r.Method == "GET" {
317 data := struct {
318 Host string
319 Errors []string
320 PageTitle string
321 }{c.Host, nil, "Register"}
322 err := t.ExecuteTemplate(w, "register.html", data)
323 if err != nil {
324 log.Println(err)
325 renderError(w, InternalServerErrorMsg, 500)
326 return
327 }
328 } else if r.Method == "POST" {
329 r.ParseForm()
330 email := r.Form.Get("email")
331 password := r.Form.Get("password")
332 errors := []string{}
333 if !strings.Contains(email, "@") {
334 errors = append(errors, "Invalid Email")
335 }
336 if r.Form.Get("password") != r.Form.Get("password2") {
337 errors = append(errors, "Passwords don't match")
338 }
339 if len(password) < 6 {
340 errors = append(errors, "Password is too short")
341 }
342 username := strings.ToLower(r.Form.Get("username"))
343 if !isOkUsername(username) {
344 errors = append(errors, "Username is invalid: can only contain letters, numbers and hypens. Maximum 32 characters.")
345 }
346 hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 8) // TODO handle error
347 if len(errors) == 0 {
348 _, err = DB.Exec("insert into user (username, email, password_hash) values ($1, $2, $3)", username, email, string(hashedPassword))
349 if err != nil {
350 log.Println(err)
351 errors = append(errors, "Username or email is already used")
352 }
353 }
354 if len(errors) > 0 {
355 data := struct {
356 Host string
357 Errors []string
358 PageTitle string
359 }{c.Host, errors, "Register"}
360 t.ExecuteTemplate(w, "register.html", data)
361 } else {
362 data := struct {
363 Host string
364 Message string
365 PageTitle string
366 }{c.Host, "Registration complete! The server admin will approve your request before you can log in.", "Registration Complete"}
367 t.ExecuteTemplate(w, "message.html", data)
368 }
369 }
370}
371
372func adminHandler(w http.ResponseWriter, r *http.Request) {
373 _, _, isAdmin := getAuthUser(r)
374 if !isAdmin {
375 renderError(w, "403: Forbidden", 403)
376 return
377 }
378 allUsers, err := getUsers()
379 if err != nil {
380 log.Println(err)
381 renderError(w, InternalServerErrorMsg, 500)
382 return
383 }
384 data := struct {
385 Users []User
386 LoggedIn bool
387 IsAdmin bool
388 PageTitle string
389 Host string
390 }{allUsers, true, true, "Admin", c.Host}
391 err = t.ExecuteTemplate(w, "admin.html", data)
392 if err != nil {
393 log.Println(err)
394 renderError(w, InternalServerErrorMsg, 500)
395 return
396 }
397}
398
399func getFavicon(user string) string {
400 faviconPath := path.Join(c.FilesDirectory, filepath.Clean(user), "favicon.txt")
401 content, err := ioutil.ReadFile(faviconPath)
402 if err != nil {
403 return ""
404 }
405 strcontent := []rune(string(content))
406 if len(strcontent) > 0 {
407 return string(strcontent[0])
408 }
409 return ""
410}
411
412// Server a user's file
413func userFile(w http.ResponseWriter, r *http.Request) {
414 userName := filepath.Clean(strings.Split(r.Host, ".")[0]) // clean probably unnecessary
415 p := filepath.Clean(r.URL.Path)
416 if p == "/" {
417 p = "index.gmi"
418 }
419 fileName := path.Join(c.FilesDirectory, userName, p)
420 extension := path.Ext(fileName)
421 if r.URL.Path == "/style.css" {
422 http.ServeFile(w, r, path.Join(c.TemplatesDirectory, "static/style.css"))
423 }
424 query := r.URL.Query()
425 _, raw := query["raw"]
426 // dumb content negotiation
427 acceptsGemini := strings.Contains(r.Header.Get("Accept"), "text/gemini")
428 if !raw && !acceptsGemini && (extension == ".gmi" || extension == ".gemini") {
429 _, err := os.Stat(fileName)
430 if err != nil {
431 renderError(w, "404: file not found", 404)
432 return
433 }
434 file, _ := os.Open(fileName)
435
436 htmlString := textToHTML(gmi.ParseText(file))
437 favicon := getFavicon(userName)
438 log.Println(favicon)
439 data := struct {
440 SiteBody template.HTML
441 Favicon string
442 PageTitle string
443 }{template.HTML(htmlString), favicon, userName}
444 t.ExecuteTemplate(w, "user_page.html", data)
445 } else {
446 http.ServeFile(w, r, fileName)
447 }
448}
449
450func adminUserHandler(w http.ResponseWriter, r *http.Request) {
451 _, _, isAdmin := getAuthUser(r)
452 if r.Method == "POST" {
453 if !isAdmin {
454 renderError(w, "403: Forbidden", 403)
455 return
456 }
457 components := strings.Split(r.URL.Path, "/")
458 if len(components) < 5 {
459 renderError(w, "Invalid action", 400)
460 return
461 }
462 userName := components[3]
463 action := components[4]
464 var err error
465 if action == "activate" {
466 err = activateUser(userName)
467 } else if action == "delete" {
468 err = deleteUser(userName)
469 }
470 if err != nil {
471 log.Println(err)
472 renderError(w, InternalServerErrorMsg, 500)
473 return
474 }
475 http.Redirect(w, r, "/admin", 303)
476 }
477}
478
479func runHTTPServer() {
480 log.Printf("Running http server with hostname %s on port %d. TLS enabled: %t", c.Host, c.HttpPort, c.HttpsEnabled)
481 var err error
482 t, err = template.ParseGlob(path.Join(c.TemplatesDirectory, "*.html"))
483 if err != nil {
484 log.Fatal(err)
485 }
486 serveMux := http.NewServeMux()
487
488 s := strings.SplitN(c.Host, ":", 2)
489 hostname := s[0]
490 port := c.HttpPort
491
492 serveMux.HandleFunc(hostname+"/", rootHandler)
493 serveMux.HandleFunc(hostname+"/my_site", mySiteHandler)
494 serveMux.HandleFunc(hostname+"/my_site/flounder-archive.zip", archiveHandler)
495 serveMux.HandleFunc(hostname+"/admin", adminHandler)
496 serveMux.HandleFunc(hostname+"/edit/", editFileHandler)
497 serveMux.HandleFunc(hostname+"/upload", uploadFilesHandler)
498 serveMux.HandleFunc(hostname+"/login", loginHandler)
499 serveMux.HandleFunc(hostname+"/logout", logoutHandler)
500 serveMux.HandleFunc(hostname+"/register", registerHandler)
501 serveMux.HandleFunc(hostname+"/delete/", deleteFileHandler)
502
503 // admin commands
504 serveMux.HandleFunc(hostname+"/admin/user/", adminUserHandler)
505
506 // TODO rate limit login https://github.com/ulule/limiter
507
508 wrapped := handlers.LoggingHandler(log.Writer(), serveMux)
509
510 // handle user files based on subdomain
511 serveMux.HandleFunc("/", userFile)
512 // login+register functions
513 srv := &http.Server{
514 ReadTimeout: 5 * time.Second,
515 WriteTimeout: 10 * time.Second,
516 IdleTimeout: 120 * time.Second,
517 Addr: fmt.Sprintf(":%d", port),
518 // TLSConfig: tlsConfig,
519 Handler: wrapped,
520 }
521 if c.HttpsEnabled {
522 log.Fatal(srv.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile))
523 } else {
524 log.Fatal(srv.ListenAndServe())
525 }
526}