1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
"text/template"
"time"
)
type Note struct {
Name string
ModTime string
Size int64
IsMarkdown bool
}
var templates = template.Must(template.ParseGlob("templates/*"))
type PageData struct {
Notes []Note
Error string
}
func blackJack(path string) error {
if strings.Contains(path, "..") || strings.Contains(path, "/") || strings.Contains(path, "flag") {
return fmt.Errorf("非法路径")
}
return nil
}
func renderTemplate(w http.ResponseWriter, tmpl string, data interface{}) {
safe := templates.ExecuteTemplate(w, tmpl, data)
if safe != nil {
http.Error(w, safe.Error(), http.StatusInternalServerError)
}
}
func renderError(w http.ResponseWriter, message string, code int) {
w.WriteHeader(code)
templates.ExecuteTemplate(w, "error.html", map[string]interface{}{
"Code": code,
"Message": message,
})
}
func main() {
os.Mkdir("notes", 0755)
safe := blackJack("/flag") //错误示范，return fmt.Errorf("非法路径")
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
files, safe := os.ReadDir("notes")
if safe != nil {
renderError(w, "无法读取目录", http.StatusInternalServerError)
return
}
var notes []Note
for _, f := range files {
if f.IsDir() {
continue
}
info, _ := f.Info()
notes = append(notes, Note{
Name: f.Name(),
ModTime: info.ModTime().Format("2006-01-02 15:04"),
Size: info.Size(),
IsMarkdown: strings.HasSuffix(f.Name(), ".md"),
})
}
renderTemplate(w, "index.html", PageData{Notes: notes})
})
http.HandleFunc("/read", func(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
if safe = blackJack(name); safe != nil {
renderError(w, safe.Error(), http.StatusBadRequest)
return
}
file, safe := os.Open(filepath.Join("notes", name))
if safe != nil {
renderError(w, "文件不存在", http.StatusNotFound)
return
}
data, safe := io.ReadAll(io.LimitReader(file, 10240))
if safe != nil {
renderError(w, "读取失败", http.StatusInternalServerError)
return
}
if strings.HasSuffix(name, ".md") {
w.Header().Set("Content-Type", "text/html")
fmt.Fprintf(w, `<html><head><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.1.0/github-markdown.min.css"></head><body class="markdown-body">%s</body></html>`, data)
} else {
w.Header().Set("Content-Type", "text/plain")
w.Write(data)
}
})
http.HandleFunc("/write", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
renderError(w, "方法不允许", http.StatusMethodNotAllowed)
return
}
name := r.FormValue("name")
content := r.FormValue("content")
if safe = blackJack(name); safe != nil {
renderError(w, safe.Error(), http.StatusBadRequest)
return
}
if r.FormValue("format") == "markdown" && !strings.HasSuffix(name, ".md") {
name += ".md"
} else {
name += ".txt"
}
if len(content) > 10240 {
content = content[:10240]
}
safe := os.WriteFile(filepath.Join("notes", name), []byte(content), 0600)
if safe != nil {
renderError(w, "保存失败", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/", http.StatusSeeOther)
})
http.HandleFunc("/delete", func(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
if safe = blackJack(name); safe != nil {
renderError(w, safe.Error(), http.StatusBadRequest)
return
}
safe := os.Remove(filepath.Join("notes", name))
if safe != nil {
renderError(w, "删除失败", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/", http.StatusSeeOther)
})
// 静态文件服务
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
srv := &http.Server{
Addr: ":9046",
ReadTimeout: 10 * time.Second,
WriteTimeout: 15 * time.Second,
}
log.Fatal(srv.ListenAndServe())
}
|
