3 Things You May Not Know About The Go Template Engine

Ee191858f0d96ad93098694537f71998?s=47 Sau Sheong Chang
March 03, 2015
Technology
0
83

3 Things You May Not Know About The Go Template Engine

A short introduction to the Go template engine

Ee191858f0d96ad93098694537f71998?s=128

Sau Sheong Chang

March 03, 2015
Tweet

More Decks by Sau Sheong Chang

See All by Sau Sheong Chang
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
52
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
350
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
190
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
42
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
25
Ee191858f0d96ad93098694537f71998?s=48 sausheong
7
590
Ee191858f0d96ad93098694537f71998?s=48 sausheong
1
50
Ee191858f0d96ad93098694537f71998?s=48 sausheong
0
55
Ee191858f0d96ad93098694537f71998?s=48 sausheong
3
260

Other Decks in Technology

See All in Technology
0ced4f52ccc9e9b2644b4dd7f475e545?s=48 kkojima
1
210
703c34db2db0e609fddec6a5585ceccc?s=48 kenta_sato3
2
160
53e2d354b3299d64a54af680865516d5?s=48 satotakeshi
3
670
8065fe5a0d33908c6f71c5ae28939dcd?s=48 ayatokura
0
100
61a68b2172503ecdf7a7f7757df56071?s=48 toyship
1
380
C786d7772602b488a7972c38c143f61c?s=48 con_mame
3
1.8k
C58d9fc209cfdc0b822f851911110fa6?s=48 coe
14
6.2k
Cd341135f01e6abaf3e9906ca8977256?s=48 emory
0
130
C422cc033079e005fd1aa1b845b099da?s=48 meow_noisy
0
110
88f4e84b94fe07cddbd9e6479d689192?s=48 soudai
1
370
F274f2fd3531a606f0a5766c9052b5d8?s=48 miyamotok
0
510
C3c921c8ae5f684bf046937bd162f322?s=48 kawagoi
6
1.3k

Featured

See All Featured
F68cb25ae3e5c2106997454b13b7737d?s=48 brad_frost
154
6.2k
9fa239b3154a0169d99ab7bf1422dd12?s=48 marcelosomers
220
14k
E4f5d494ebdc9e7cce1aecf3ce3e8bc1?s=48 shpigford
164
18k
E6c6e133e74c3b83f04d2861deaa1c20?s=48 searls
202
35k
C35e01544a0dd94a2cf1619ee8a42ebb?s=48 clairelew
10
1.2k
Bfd6b681ec6e8c9bef82ff0521c364f7?s=48 kastner
52
1.8k
245cee81a9c424266e5e401d844ea881?s=48 lara
169
9.2k
E43f8dfd01057f8304f5f8fb9a294d7d?s=48 jeffersonlam
325
14k
E76911cbe088e5b850d966de3fc7435b?s=48 robhawkes
52
2.7k
5ce91fa49a613cbc3e20d5f96856473f?s=48 edds
55
9.2k
Dad095ea7038f89f760419ce475d5d14?s=48 michaelherold
224
8.3k
Ded01cdab114abe4ec13511e4c25b9bb?s=48 andyhume
60
2.4k

Transcript

  1. 3  Things  You  May  Not   Know  About  The  Go

      Template  Engine   Chang  Sau  Sheong   Feb  2015  

  2. Obligatory  stuff  

  3. What  is  a  template   engine?  

  4. None
  5. None

  6. Where’s  Go  template  engine?   Logic-­‐less   Go   template

      engine   Embedded   logic   Mustache,  Handlebars  etc   JSP,  Haml,  Jade  etc  

  7. How  does  the  Go  template   engine  work?  

  8. text/template   html/template  

  9. Parse   template   Execute   template  

  10. <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web

    Programming</title> </head> <body> {{ . }} </body> </html>

  11. package main import ( "net/http" "html/template" ) func process(w http.ResponseWriter,

    r *http.Request) { t, _ := template.ParseFiles("tmpl.html") t.Execute(w, "Hello World!") } func main() { server := http.Server{ Addr: "127.0.0.1:8080", } http.HandleFunc("/process", process) server.ListenAndServe() }

  12. The  Go  template  engine  is   kinda  cool  

  13. 1.  Pipelines  

  14. {{ p1 | p2 | p3 }}

  15. <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/ html; charset=utf-8"> <title>Go

    Web Programming</title> </head> <body> {{ 12.3456 | printf "%.2f" }} </body> </html>

  16. 2.  FuncTons  

  17. func formatDate(t time.Time) string { layout := "2006-01-02" return t.Format(layout)

    } func process(w http.ResponseWriter, r *http.Request) { funcMap := template.FuncMap { "fdate": formatDate } t := template.New("tmpl.html").Funcs(funcMap) t, _ = t.ParseFiles("tmpl.html") t.Execute(w, time.Now()) }

  18. <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web Programming</title> </head>

    <body> <div>The date/time is {{ fdate . }}</div> </body> </html>

  19. <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web Programming</title> </head>

    <body> <div>The date/time is {{ . | fdate }}</div> </body> </html>

  20. 3.  Context  aware  

  21. func process(w http.ResponseWriter, r *http.Request) { t, _ := template.ParseFiles("tmpl.html")

    content := `I asked: <i>"What's up?"</i>` t.Execute(w, content) }

  22. <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web Programming</title> </head>

    <body> <div>{{ . }}</div> <div><a href="/{{ . }}">Path</a></div> <div><a href="/?q={{ . }}">Query</a></div> <div><a onclick="f('{{ . }}')">Onclick</a></div> </body> </html>

  23. <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Go Web Programming</title> </head>

    <body> <div>I asked: &lt;i&gt;&#34;What&#39;s up?&#34;&lt;/ i&gt;</div> <div><a href="/I%20asked:%20%3ci%3e%22What%27s%20up? %22%3c/i%3e">Path</a></div> <div><a href="/?q=I%20asked%3a%20%3ci%3e%22What%27s %20up%3f%22%3c%2fi%3e">Query</a></div> <div><a onclick="f('I asked: \x3ci\x3e\x22What\x27s up?\x22\x3c\/i\x3e')">Onclick</a></div> </body> </html>

  24. Context Content Original text I asked: <i>"What's up?"</i> {{ .

    }} I asked: &lt;i&gt;&#34;What&#39;s up?&#34;&lt;/i&gt; <a href="/{{ . }}"> I%20asked:%20%3ci%3e%22What%27s%20up?%22%3c/i%3e <a href="/?q={{ . }}"> I%20asked%3a%20%3ci%3e%22What%27s%20up%3f%22%3c %2fi%3e <a onclick="{{ . }}"> I asked: \x3ci\x3e\x22What\x27s up?\x22\x3c\/i\x3e

  25. XSS  

  26. XSS  Demo    

  27. hWp://manning.com/chang  

  28. Thank  you   sausheong@gmail.com   @sausheong