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comparison backend/main.go @ 0:a17a4894f4bd draft default tip

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Initial commit converting git to mercurial
author Alfred Burgess <aburgess@ucc.asn.au>
date Sun, 14 Apr 2024 19:35:23 +0800
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-1:000000000000 0:a17a4894f4bd
1 package main
2
3 import (
4 "os"
5 "fmt"
6 "errors"
7 "html/template"
8 "log"
9 "net/http"
10 "regexp"
11 )
12
13 type ApiReq struct {
14 endpoint string
15 }
16
17 type Page struct {
18 Title string
19 Content []byte
20 }
21
22 func (p *Page) save() error {
23 filename := p.Title + ".txt"
24 return os.WriteFile(filename, p.Content, 0600)
25 }
26
27 func loadPage(title string) ( *Page, error ) {
28 filename := title + ".txt"
29 body, err := os.ReadFile(filename)
30 if err != nil {
31 return nil, err
32 }
33 return &Page{Title: title, Content: body}, nil
34 }
35
36 func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
37 t, err := template.ParseFiles( "views/" + tmpl + ".html" )
38 if err != nil {
39 http.Error( w, err.Error(), http.StatusInternalServerError )
40 return
41 }
42 err = t.Execute( w, p )
43 if err != nil {
44 http.Error( w, err.Error(), http.StatusInternalServerError )
45 return
46 }
47 }
48
49 func apiHandler(w http.ResponseWriter, r *http.Request) {
50 endpoint, _ := getTitle( w, r )
51 log.Printf(`API Request: %s`, endpoint )
52 }
53
54 func errorViewHandler(w http.ResponseWriter, r *http.Request) {
55 title, _ := getTitle( w, r )
56 log.Printf( `Rendering error page: %s`, title )
57 p := &Page{ Title: title }
58 renderTemplate( w, "error", p )
59 }
60 func viewHandler(w http.ResponseWriter, r *http.Request) {
61 title, err := getTitle( w, r )
62 if err != nil { title = "404" }
63 log.Printf( `Rendering page: %s`, title )
64 p, err := loadPage( title )
65 if err != nil {
66 http.Redirect( w, r, "/error/404", http.StatusFound )
67 return
68 }
69 renderTemplate( w, "test", p )
70 }
71
72 var validPath = regexp.MustCompile( "^/(view|error|api)/([a-zA-Z0-9]+)$" )
73 func getTitle( w http.ResponseWriter, r *http.Request ) ( string, error ) {
74 m := validPath.FindStringSubmatch( r.URL.Path )
75 if m == nil {
76 http.NotFound( w, r )
77 return "", errors.New("Unsupported Route")
78 }
79 return m[2], nil
80 }
81
82 func main() {
83 http.HandleFunc("/view/", viewHandler)
84 http.HandleFunc("/error/", errorViewHandler)
85 http.HandleFunc("/api/", apiHandler)
86
87 fmt.Printf("Server Running")
88
89 log.Fatal(http.ListenAndServe(":8080", nil))
90 }
91