http.go (view raw)
1package main
2
3import (
4 "bytes"
5 "database/sql"
6 gmi "git.sr.ht/~adnano/go-gemini"
7 "github.com/gorilla/handlers"
8 "github.com/gorilla/sessions"
9 _ "github.com/mattn/go-sqlite3"
10 "golang.org/x/crypto/bcrypt"
11 "html/template"
12 "io"
13 "io/ioutil"
14 "log"
15 "net/http"
16 "os"
17 "path"
18 "path/filepath"
19 "strings"
20 "time"
21)
22
23var t *template.Template
24var DB *sql.DB
25var SessionStore *sessions.CookieStore
26
27const InternalServerErrorMsg = "500: Internal Server Error"
28
29func renderError(w http.ResponseWriter, errorMsg string, statusCode int) {
30 data := struct {
31 PageTitle string
32 ErrorMsg string
33 }{"Error!", errorMsg}
34 err := t.ExecuteTemplate(w, "error.html", data)
35 if err != nil { // shouldn't happen probably
36 http.Error(w, errorMsg, statusCode)
37 }
38}
39
40func rootHandler(w http.ResponseWriter, r *http.Request) {
41 // serve everything inside static directory
42 if r.URL.Path != "/" {
43 fileName := path.Join(c.TemplatesDirectory, "static", filepath.Clean(r.URL.Path))
44 http.ServeFile(w, r, fileName)
45 return
46 }
47 _, authd := getAuthUser(r)
48 indexFiles, err := getIndexFiles()
49 if err != nil {
50 log.Println(err)
51 renderError(w, InternalServerErrorMsg, 500)
52 return
53 }
54 allUsers, err := getUsers()
55 if err != nil {
56 log.Println(err)
57 renderError(w, InternalServerErrorMsg, 500)
58 return
59 }
60 data := struct {
61 Host string
62 PageTitle string
63 Files []*File
64 Users []string
65 LoggedIn bool
66 }{c.Host, c.SiteTitle, indexFiles, allUsers, authd}
67 err = t.ExecuteTemplate(w, "index.html", data)
68 if err != nil {
69 log.Println(err)
70 renderError(w, InternalServerErrorMsg, 500)
71 return
72 }
73}
74
75func editFileHandler(w http.ResponseWriter, r *http.Request) {
76 session, _ := SessionStore.Get(r, "cookie-session")
77 authUser, ok := session.Values["auth_user"].(string)
78 if !ok {
79 renderError(w, "Forbidden", 403)
80 return
81 }
82 fileName := filepath.Clean(r.URL.Path[len("/edit/"):])
83 filePath := path.Join(c.FilesDirectory, authUser, fileName)
84 if r.Method == "GET" {
85 err := checkIfValidFile(filePath, nil)
86 if err != nil {
87 log.Println(err)
88 renderError(w, err.Error(), 400)
89 return
90 }
91 f, err := os.OpenFile(filePath, os.O_RDONLY|os.O_CREATE, 0644)
92 defer f.Close()
93 fileBytes, err := ioutil.ReadAll(f)
94 if err != nil {
95 log.Println(err)
96 renderError(w, InternalServerErrorMsg, 500)
97 return
98 }
99 data := struct {
100 FileName string
101 FileText string
102 PageTitle string
103 }{fileName, string(fileBytes), c.SiteTitle}
104 err = t.ExecuteTemplate(w, "edit_file.html", data)
105 if err != nil {
106 log.Println(err)
107 renderError(w, InternalServerErrorMsg, 500)
108 return
109 }
110 } else if r.Method == "POST" {
111 // get post body
112 r.ParseForm()
113 fileBytes := []byte(r.Form.Get("file_text"))
114 err := checkIfValidFile(filePath, fileBytes)
115 if err != nil {
116 log.Println(err)
117 renderError(w, err.Error(), 400)
118 return
119 }
120 err = ioutil.WriteFile(filePath, fileBytes, 0644)
121 if err != nil {
122 log.Println(err)
123 renderError(w, InternalServerErrorMsg, 500)
124 return
125 }
126 http.Redirect(w, r, "/my_site", 302)
127 }
128}
129
130func uploadFilesHandler(w http.ResponseWriter, r *http.Request) {
131 if r.Method == "POST" {
132 session, _ := SessionStore.Get(r, "cookie-session")
133 authUser, ok := session.Values["auth_user"].(string)
134 if !ok {
135 renderError(w, "Forbidden", 403)
136 return
137 }
138 r.ParseMultipartForm(10 << 6) // why does this not work
139 file, fileHeader, err := r.FormFile("file")
140 fileName := filepath.Clean(fileHeader.Filename)
141 defer file.Close()
142 if err != nil {
143 log.Println(err)
144 renderError(w, err.Error(), 400)
145 return
146 }
147 dest, _ := ioutil.ReadAll(file)
148 err = checkIfValidFile(fileName, dest)
149 if err != nil {
150 log.Println(err)
151 renderError(w, err.Error(), 400)
152 return
153 }
154 destPath := path.Join(c.FilesDirectory, authUser, fileName)
155
156 f, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE, 0644)
157 if err != nil {
158 log.Println(err)
159 renderError(w, InternalServerErrorMsg, 500)
160 return
161 }
162 defer f.Close()
163 io.Copy(f, bytes.NewReader(dest))
164 }
165 http.Redirect(w, r, "/my_site", 302)
166}
167
168// bool whether auth'd, string is auth user
169func getAuthUser(r *http.Request) (string, bool) {
170 session, _ := SessionStore.Get(r, "cookie-session")
171 user, ok := session.Values["auth_user"].(string)
172 return user, ok
173}
174func deleteFileHandler(w http.ResponseWriter, r *http.Request) {
175 authUser, authd := getAuthUser(r)
176 if !authd {
177 renderError(w, "Forbidden", 403)
178 return
179 }
180 fileName := filepath.Clean(r.URL.Path[len("/delete/"):])
181 filePath := path.Join(c.FilesDirectory, authUser, fileName)
182 if r.Method == "POST" {
183 os.Remove(filePath) // suppress error
184 }
185 http.Redirect(w, r, "/my_site", 302)
186}
187
188func mySiteHandler(w http.ResponseWriter, r *http.Request) {
189 authUser, authd := getAuthUser(r)
190 if !authd {
191 renderError(w, "Forbidden", 403)
192 return
193 }
194 // check auth
195 files, _ := getUserFiles(authUser)
196 data := struct {
197 Host string
198 PageTitle string
199 AuthUser string
200 Files []*File
201 LoggedIn bool
202 }{c.Host, c.SiteTitle, authUser, files, authd}
203 _ = t.ExecuteTemplate(w, "my_site.html", data)
204}
205
206func loginHandler(w http.ResponseWriter, r *http.Request) {
207 if r.Method == "GET" {
208 // show page
209 data := struct {
210 Error string
211 PageTitle string
212 }{"", "Login"}
213 err := t.ExecuteTemplate(w, "login.html", data)
214 if err != nil {
215 log.Println(err)
216 renderError(w, InternalServerErrorMsg, 500)
217 return
218 }
219 } else if r.Method == "POST" {
220 r.ParseForm()
221 name := r.Form.Get("username")
222 password := r.Form.Get("password")
223 row := DB.QueryRow("SELECT password_hash, active FROM user where username = $1", name)
224 var db_password []byte
225 var active bool
226 _ = row.Scan(&db_password, &active)
227 if db_password != nil && !active {
228 data := struct {
229 Error string
230 PageTitle string
231 }{"Your account is not active yet. Pending admin approval", c.SiteTitle}
232 t.ExecuteTemplate(w, "login.html", data)
233 return
234 }
235 if bcrypt.CompareHashAndPassword(db_password, []byte(password)) == nil {
236 log.Println("logged in")
237 session, _ := SessionStore.Get(r, "cookie-session")
238 session.Values["auth_user"] = name
239 session.Save(r, w)
240 http.Redirect(w, r, "/", 302)
241 } else {
242 data := struct {
243 Error string
244 PageTitle string
245 }{"Invalid login or password", c.SiteTitle}
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 }
253 }
254}
255
256func logoutHandler(w http.ResponseWriter, r *http.Request) {
257 session, _ := SessionStore.Get(r, "cookie-session")
258 session.Options.MaxAge = -1
259 session.Save(r, w)
260 http.Redirect(w, r, "/", 302)
261}
262
263const ok = "-0123456789abcdefghijklmnopqrstuvwxyz"
264
265func isOkUsername(s string) bool {
266 if len(s) < 1 {
267 return false
268 }
269 if len(s) > 31 {
270 return false
271 }
272 for _, char := range s {
273 if !strings.Contains(ok, strings.ToLower(string(char))) {
274 return false
275 }
276 }
277 return true
278}
279func registerHandler(w http.ResponseWriter, r *http.Request) {
280 if r.Method == "GET" {
281 data := struct {
282 Host string
283 Errors []string
284 PageTitle string
285 }{c.Host, nil, "Register"}
286 err := t.ExecuteTemplate(w, "register.html", data)
287 if err != nil {
288 log.Println(err)
289 renderError(w, InternalServerErrorMsg, 500)
290 return
291 }
292 } else if r.Method == "POST" {
293 r.ParseForm()
294 email := r.Form.Get("email")
295 password := r.Form.Get("password")
296 errors := []string{}
297 if !strings.Contains(email, "@") {
298 errors = append(errors, "Invalid Email")
299 }
300 if r.Form.Get("password") != r.Form.Get("password2") {
301 errors = append(errors, "Passwords don't match")
302 }
303 if len(password) < 6 {
304 errors = append(errors, "Password is too short")
305 }
306 username := strings.ToLower(r.Form.Get("username"))
307 if !isOkUsername(username) {
308 errors = append(errors, "Username is invalid: can only contain letters, numbers and hypens. Maximum 32 characters.")
309 }
310 hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), 8) // TODO handle error
311 if len(errors) == 0 {
312 _, err = DB.Exec("insert into user (username, email, password_hash) values ($1, $2, $3)", username, email, string(hashedPassword))
313 if err != nil {
314 log.Println(err)
315 errors = append(errors, "Username or email is already used")
316 }
317 }
318 if len(errors) > 0 {
319 data := struct {
320 Host string
321 Errors []string
322 PageTitle string
323 }{c.Host, errors, "Register"}
324 t.ExecuteTemplate(w, "register.html", data)
325 } else {
326 data := struct {
327 Host string
328 Message string
329 PageTitle string
330 }{c.Host, "Registration complete! The server admin will approve your request before you can log in.", "Registration Complete"}
331 t.ExecuteTemplate(w, "message.html", data)
332 }
333 }
334}
335
336// Server a user's file
337func userFile(w http.ResponseWriter, r *http.Request) {
338 userName := strings.Split(r.Host, ".")[0]
339 p := filepath.Clean(r.URL.Path)
340 if p == "/" {
341 p = "index.gmi"
342 }
343 fileName := path.Join(c.FilesDirectory, userName, p)
344 extension := path.Ext(fileName)
345 if r.URL.Path == "/style.css" {
346 http.ServeFile(w, r, path.Join(c.TemplatesDirectory, "static/style.css"))
347 }
348 query := r.URL.Query()
349 _, raw := query["raw"]
350 if !raw && (extension == ".gmi" || extension == ".gemini") {
351 _, err := os.Stat(fileName)
352 if err != nil {
353 renderError(w, "404: file not found", 404)
354 return
355 }
356 file, _ := os.Open(fileName)
357
358 htmlString := textToHTML(gmi.Parse(file))
359 data := struct {
360 SiteBody template.HTML
361 PageTitle string
362 }{template.HTML(htmlString), userName}
363 t.ExecuteTemplate(w, "user_page.html", data)
364 } else {
365 http.ServeFile(w, r, fileName)
366 }
367}
368
369func runHTTPServer() {
370 log.Printf("Running http server on %s", c.Host)
371 var err error
372 t, err = template.ParseGlob(path.Join(c.TemplatesDirectory, "*.html"))
373 if err != nil {
374 log.Fatal(err)
375 }
376 serveMux := http.NewServeMux()
377
378 s := strings.SplitN(c.Host, ":", 2)
379 hostname := s[0]
380 var port string
381 if len(s) > 1 {
382 port = s[1]
383 } else {
384 port = "443"
385 }
386 serveMux.HandleFunc(hostname+"/", rootHandler)
387 serveMux.HandleFunc(hostname+"/my_site", mySiteHandler)
388 serveMux.HandleFunc(hostname+"/edit/", editFileHandler)
389 serveMux.HandleFunc(hostname+"/upload", uploadFilesHandler)
390 serveMux.HandleFunc(hostname+"/login", loginHandler)
391 serveMux.HandleFunc(hostname+"/logout", logoutHandler)
392 serveMux.HandleFunc(hostname+"/register", registerHandler)
393 serveMux.HandleFunc(hostname+"/delete/", deleteFileHandler)
394
395 // TODO rate limit login https://github.com/ulule/limiter
396
397 wrapped := handlers.LoggingHandler(log.Writer(), serveMux)
398
399 // handle user files based on subdomain
400 serveMux.HandleFunc("/", userFile)
401 // login+register functions
402 srv := &http.Server{
403 ReadTimeout: 5 * time.Second,
404 WriteTimeout: 10 * time.Second,
405 IdleTimeout: 120 * time.Second,
406 Addr: ":" + port,
407 // TLSConfig: tlsConfig,
408 Handler: wrapped,
409 }
410 log.Fatal(srv.ListenAndServeTLS(c.TLSCertFile, c.TLSKeyFile))
411}