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
|
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"go/ast"
"go/token"
)
func init() {
register(httpFileSystemFix)
}
var httpFileSystemFix = fix{
"httpfs",
"2011-06-27",
httpfs,
`Adapt http FileServer to take a FileSystem.
http://codereview.appspot.com/4629047 http FileSystem interface
`,
}
func httpfs(f *ast.File) bool {
if !imports(f, "http") {
return false
}
fixed := false
walk(f, func(n interface{}) {
call, ok := n.(*ast.CallExpr)
if !ok || !isPkgDot(call.Fun, "http", "FileServer") {
return
}
if len(call.Args) != 2 {
return
}
dir, prefix := call.Args[0], call.Args[1]
call.Args = []ast.Expr{&ast.CallExpr{
Fun: &ast.SelectorExpr{
X: ast.NewIdent("http"),
Sel: ast.NewIdent("Dir"),
},
Args: []ast.Expr{dir},
}}
wrapInStripHandler := true
if prefixLit, ok := prefix.(*ast.BasicLit); ok {
if prefixLit.Kind == token.STRING && (prefixLit.Value == `"/"` || prefixLit.Value == `""`) {
wrapInStripHandler = false
}
}
if wrapInStripHandler {
call.Fun.(*ast.SelectorExpr).Sel = ast.NewIdent("StripPrefix")
call.Args = []ast.Expr{
prefix,
&ast.CallExpr{
Fun: &ast.SelectorExpr{
X: ast.NewIdent("http"),
Sel: ast.NewIdent("FileServer"),
},
Args: call.Args,
},
}
}
fixed = true
})
return fixed
}
|
