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 "net/http"
17 "os"
18 "path"
19 "path/filepath"
20 "strings"
21 "time"
22)
23
24var t *template.Template
25var DB *sql.DB
26var SessionStore *sessions.CookieStore
27
28const InternalServerErrorMsg = "500: Internal Server Error"
29
30func renderError(w http.ResponseWriter, errorMsg string, statusCode int) {
31 data := struct {
32 PageTitle string
33 ErrorMsg string
34 }{"Error!", errorMsg}
35 err := t.ExecuteTemplate(w, "error.html", data)
36 if err != nil { // shouldn't happen probably
37 http.Error(w, errorMsg, statusCode)
38 }
39}
40
41func rootHandler(w http.ResponseWriter, r *http.Request) {
42 // serve everything inside static directory
43 if r.URL.Path != "/" {
44 fileName := path.Join(c.TemplatesDirectory, "static", filepath.Clean(r.URL.Path))
45 http.ServeFile(w, r, fileName)
46 return
47 }
48 authd, _, isAdmin := getAuthUser(r)
49 indexFiles, err := getIndexFiles()
50 if err != nil {
51 log.Println(err)
52 renderError(w, InternalServerErrorMsg, 500)
53 return
54 }
55 allUsers, err := getUsers()
56 if err != nil {
57 log.Println(err)
58 renderError(w, InternalServerErrorMsg, 500)
59 return
60 }
61 data := struct {
62 Host string
63 PageTitle string
64 Files []*File
65 Users []string
66 LoggedIn bool
67 IsAdmin bool
68 }{c.Host, c.SiteTitle, indexFiles, allUsers, authd, isAdmin}
69 err = t.ExecuteTemplate(w, "index.html", data)
70 if err != nil {
71 log.Println(err)
72 renderError(w, InternalServerErrorMsg, 500)
73 return
74 }
75}
76
77func editFileHandler(w http.ResponseWriter, r *http.Request) {
78 session, _ := SessionStore.Get(r, "cookie-session")
79 authUser, ok := session.Values["auth_user"].(string)
80 if !ok {
81 renderError(w, "Forbidden", 403)
82 return
83 }
84 fileName := filepath.Clean(r.URL.Path[len("/edit/"):])
85 filePath := path.Join(c.FilesDirectory, authUser, fileName)
86 if r.Method == "GET" {
87 err := checkIfValidFile(filePath, nil)
88 if err != nil {
89 log.Println(err)
90 renderError(w, err.Error(), 400)
91 return
92 }
93 f, err := os.OpenFile(filePath, os.O_RDONLY|os.O_CREATE, 0644)
94 defer f.Close()
95 fileBytes, err := ioutil.ReadAll(f)
96 if err != nil {
97 log.Println(err)
98 renderError(w, InternalServerErrorMsg, 500)
99 return
100 }
101 data := struct {
102 FileName string
103 FileText string
104 PageTitle string
105 }{fileName, string(fileBytes), c.SiteTitle}
106 err = t.ExecuteTemplate(w, "edit_file.html", data)
107 if err != nil {
108 log.Println(err)
109 renderError(w, InternalServerErrorMsg, 500)
110 return
111 }
112 } else if r.Method == "POST" {
113 // get post body
114 r.ParseForm()
115 fileBytes := []byte(r.Form.Get("file_text"))
116 err := checkIfValidFile(filePath, fileBytes)
117 if err != nil {
118 log.Println(err)
119 renderError(w, err.Error(), 400)
120 return
121 }
122 err = ioutil.WriteFile(filePath, fileBytes, 0644)
123 if err != nil {
124 log.Println(err)
125 renderError(w, InternalServerErrorMsg, 500)
126 return
127 }
128 http.Redirect(w, r, "/my_site", 302)
129 }
130}
131
132func uploadFilesHandler(w http.ResponseWriter, r *http.Request) {
133 if r.Method == "POST" {
134 session, _ := SessionStore.Get(r, "cookie-session")
135 authUser, ok := session.Values["auth_user"].(string)
136 if !ok {
137 renderError(w, "Forbidden", 403)
138 return
139 }
140 r.ParseMultipartForm(10 << 6) // why does this not work
141 file, fileHeader, err := r.FormFile("file")
142 fileName := filepath.Clean(fileHeader.Filename)
143 defer file.Close()
144 if err != nil {
145 log.Println(err)
146 renderError(w, err.Error(), 400)
147 return
148 }
149 dest, _ := ioutil.ReadAll(file)
150 err = checkIfValidFile(fileName, dest)
151 if err != nil {
152 log.Println(err)
153 renderError(w, err.Error(), 400)
154 return
155 }
156 destPath := path.Join(c.FilesDirectory, authUser, fileName)
157
158 f, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE, 0644)
159 if err != nil {
160 log.Println(err)
161 renderError(w, InternalServerErrorMsg, 500)
162 return
163 }
164 defer f.Close()
165 io.Copy(f, bytes.NewReader(dest))
166 }
167 http.Redirect(w, r, "/my_site", 302)
168}
169
170// bool whether auth'd, string is auth user
171func getAuthUser(r *http.Request) (bool, string, bool) {
172 session, _ := SessionStore.Get(r, "cookie-session")
173 user, ok := session.Values["auth_user"].(string)
174 isAdmin, _ := session.Values["admin"].(bool)
175 return ok, user, isAdmin
176}
177func deleteFileHandler(w http.ResponseWriter, r *http.Request) {
178 authd, authUser, _ := getAuthUser(r)
179 if !authd {
180 renderError(w, "Forbidden", 403)
181 return
182 }
183 fileName := filepath.Clean(r.URL.Path[len("/delete/"):])
184 filePath := path.Join(c.FilesDirectory, authUser, fileName)
185 if r.Method == "POST" {
186 os.Remove(filePath) // suppress error
187 }
188 http.Redirect(w, r, "/my_site", 302)
189}
190
191func mySiteHandler(w http.ResponseWriter, r *http.Request) {
192 authd, authUser, _ := getAuthUser(r)
193 if !authd {
194 renderError(w, "Forbidden", 403)
195 return
196 }
197 // check auth
198 files, _ := getUserFiles(authUser)
199 data := struct {
200 Host string
201 PageTitle string
202 AuthUser string
203 Files []*File
204 LoggedIn bool
205 }{c.Host, c.SiteTitle, authUser, files, authd}
206 _ = t.ExecuteTemplate(w, "my_site.html", data)
207}
208
209func loginHandler(w http.ResponseWriter, r *http.Request) {
210 if r.Method == "GET" {
211 // show page
212 data := struct {
213 Error string
214 PageTitle string
215 }{"", "Login"}
216 err := t.ExecuteTemplate(w, "login.html", data)
217 if err != nil {
218 log.Println(err)
219 renderError(w, InternalServerErrorMsg, 500)
220 return
221 }
222 } else if r.Method == "POST" {
223 r.ParseForm()
224 name := r.Form.Get("username")
225 password := r.Form.Get("password")
226 row := DB.QueryRow("SELECT password_hash, active, admin FROM user where username = $1", name)
227 var db_password []byte
228 var active bool
229 var isAdmin bool
230 _ = row.Scan(&db_password, &active, &isAdmin)
231 if db_password != nil && !active {
232 data := struct {
233 Error string
234 PageTitle string
235 }{"Your account is not active yet. Pending admin approval", c.SiteTitle}
236 t.ExecuteTemplate(w, "login.html", data)
237 return
238 }
239 if bcrypt.CompareHashAndPassword(db_password, []byte(password)) == nil {
240 log.Println("logged in")
241 session, _ := SessionStore.Get(r, "cookie-session")
242 session.Values["auth_user"] = name
243 session.Values["admin"] = isAdmin
244 session.Save(r, w)
245 http.Redirect(w, r, "/my_site", 302)
246 } else {
247 data := struct {
248 Error string
249 PageTitle string
250 }{"Invalid login or password", c.SiteTitle}
251 err := t.ExecuteTemplate(w, "login.html", data)
252 if err != nil {
253 log.Println(err)
254 renderError(w, InternalServerErrorMsg, 500)
255 return
256 }
257 }
258 }
259}
260
261func logoutHandler(w http.ResponseWriter, r *http.Request) {
262 session, _ := SessionStore.Get(r, "cookie-session")
263 session.Options.MaxAge = -1
264 session.Save(r, w)
265 http.Redirect(w, r, "/", 302)
266}
267
268const ok = "-0123456789abcdefghijklmnopqrstuvwxyz"
269
270func isOkUsername(s string) bool {
271 if len(s) < 1 {
272 return false
273 }
274 if len(s) > 31 {
275 return false
276 }
277 for _, char := range s {
278 if !strings.Contains(ok, strings.ToLower(string(char))) {
279 return false
280 }
281 }
282 return true
283}
284func registerHandler(w http.ResponseWriter, r *http.Request) {
285 if r.Method == "GET" {
286 data := struct {
287 Host string
288 Errors []string
289 PageTitle string
290 }{c.Host, nil, "Register"}
291 err := t.ExecuteTemplate(w, "register.html", data)
292 if err != nil {
293 log.Println(err)
294 renderError(w, InternalServerErrorMsg, 500)
295 return
296 }
297 } else if r.Method == "POST" {
298 r.ParseForm()
299 email := r.Form.Get("email")
300 password := r.Form.Get("password")
301 errors := []string{}
302 if !strings.Contains(email, "@") {
303 errors = append(errors, "Invalid Email")
304 }
305 if r.Form.Get("password") != r.Form.Get("password2") {
306 errors = append(errors, "Passwords don't match")
307 }
308 if len(password) < 6 {
309 errors = append(errors, "Password is too short")
310 }
311 username := strings.ToLower(r.Form.Get("username"))
312 if !isOkUsername(username) {
313 errors = append(errors, "Username is invalid: can only contain letters, numbers and hypens. Maximum 32 characters.")
314 }
315 hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 8) // TODO handle error
316 if len(errors) == 0 {
317 _, err = DB.Exec("insert into user (username, email, password_hash) values ($1, $2, $3)", username, email, string(hashedPassword))
318 if err != nil {
319 log.Println(err)
320 errors = append(errors, "Username or email is already used")
321 }
322 }
323 if len(errors) > 0 {
324 data := struct {
325 Host string
326 Errors []string
327 PageTitle string
328 }{c.Host, errors, "Register"}
329 t.ExecuteTemplate(w, "register.html", data)
330 } else {
331 data := struct {
332 Host string
333 Message string
334 PageTitle string
335 }{c.Host, "Registration complete! The server admin will approve your request before you can log in.", "Registration Complete"}
336 t.ExecuteTemplate(w, "message.html", data)
337 }
338 }
339}
340
341type User struct {
342}
343
344func adminHandler(w http.ResponseWriter, r *http.Request) {
345 _, _, isAdmin := getAuthUser(r)
346 if !isAdmin {
347 renderError(w, "Forbidden", 403)
348 return
349 }
350 // LIST USERS
351 data := struct {
352 users []User
353 LoggedIn bool
354 IsAdmin bool
355 PageTitle string
356 }{[]User{}, true, true, "admin"}
357 t.ExecuteTemplate(w, "admin.html", data)
358}
359
360// Server a user's file
361func userFile(w http.ResponseWriter, r *http.Request) {
362 userName := strings.Split(r.Host, ".")[0]
363 p := filepath.Clean(r.URL.Path)
364 if p == "/" {
365 p = "index.gmi"
366 }
367 fileName := path.Join(c.FilesDirectory, userName, p)
368 extension := path.Ext(fileName)
369 if r.URL.Path == "/style.css" {
370 http.ServeFile(w, r, path.Join(c.TemplatesDirectory, "static/style.css"))
371 }
372 query := r.URL.Query()
373 _, raw := query["raw"]
374 if !raw && (extension == ".gmi" || extension == ".gemini") {
375 _, err := os.Stat(fileName)
376 if err != nil {
377 renderError(w, "404: file not found", 404)
378 return
379 }
380 file, _ := os.Open(fileName)
381
382 htmlString := textToHTML(gmi.Parse(file))
383 data := struct {
384 SiteBody template.HTML
385 PageTitle string
386 }{template.HTML(htmlString), userName}
387 t.ExecuteTemplate(w, "user_page.html", data)
388 } else {
389 http.ServeFile(w, r, fileName)
390 }
391}
392
393func runHTTPServer() {
394 log.Printf("Running http server with hostname %s on port %d. TLS enabled: %t", c.Host, c.HttpPort, c.HttpsEnabled)
395 var err error
396 t, err = template.ParseGlob(path.Join(c.TemplatesDirectory, "*.html"))
397 if err != nil {
398 log.Fatal(err)
399 }
400 serveMux := http.NewServeMux()
401
402 s := strings.SplitN(c.Host, ":", 2)
403 hostname := s[0]
404 port := c.HttpPort
405
406 serveMux.HandleFunc(hostname+"/", rootHandler)
407 serveMux.HandleFunc(hostname+"/my_site", mySiteHandler)
408 serveMux.HandleFunc(hostname+"/admin", adminHandler)
409 serveMux.HandleFunc(hostname+"/edit/", editFileHandler)
410 serveMux.HandleFunc(hostname+"/upload", uploadFilesHandler)
411 serveMux.HandleFunc(hostname+"/login", loginHandler)
412 serveMux.HandleFunc(hostname+"/logout", logoutHandler)
413 serveMux.HandleFunc(hostname+"/register", registerHandler)
414 serveMux.HandleFunc(hostname+"/delete/", deleteFileHandler)
415
416 // TODO rate limit login https://github.com/ulule/limiter
417
418 wrapped := handlers.LoggingHandler(log.Writer(), serveMux)
419
420 // handle user files based on subdomain
421 serveMux.HandleFunc("/", userFile)
422 // login+register functions
423 srv := &http.Server{
424 ReadTimeout: 5 * time.Second,
425 WriteTimeout: 10 * time.Second,
426 IdleTimeout: 120 * time.Second,
427 Addr: fmt.Sprintf(":%d", port),
428 // TLSConfig: tlsConfig,
429 Handler: wrapped,
430 }
431 if c.HttpsEnabled {
432 log.Fatal(srv.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile))
433 } else {
434 log.Fatal(srv.ListenAndServe())
435 }
436}