-
Notifications
You must be signed in to change notification settings - Fork 0
/
view.go
93 lines (85 loc) · 2.37 KB
/
view.go
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
package file
import (
"bytes"
"io"
"path"
"path/filepath"
"strings"
"sync"
"time"
"github.com/webx-top/echo"
"github.com/admpub/nging/application/registry/upload"
"github.com/admpub/nging/application/registry/upload/convert"
"github.com/admpub/nging/application/registry/upload/driver/local"
"github.com/admpub/nging/application/registry/upload/helper"
)
var fileGeneratorLock = sync.RWMutex{}
func File(ctx echo.Context) error {
uploadType := ctx.Param(`type`)
typ, _, _ := upload.GetTableInfo(uploadType)
file := ctx.Param(`*`)
file = filepath.Join(helper.UploadDir, typ, file)
var (
convertFunc convert.Convert
ok bool
originalFile string
)
extension := ctx.Query(`ex`)
if len(extension) > 0 {
extension = `.` + extension
convertFunc, ok = convert.GetConverter(extension)
if !ok {
return ctx.File(file)
}
originalFile = file
} else {
originalExtension := filepath.Ext(file)
extension = strings.ToLower(originalExtension)
convertFunc, ok = convert.GetConverter(extension)
if !ok {
return ctx.File(file)
}
originalFile = strings.TrimSuffix(file, originalExtension)
index := strings.LastIndex(originalFile, `.`)
// 单扩展名或相同扩展名的情况下不转换格式
if index < 0 || strings.ToLower(originalFile[index:]) == extension {
return ctx.File(originalFile)
}
}
supported := strings.Contains(ctx.Header(echo.HeaderAccept), "image/"+strings.TrimPrefix(extension, `.`))
if !supported {
return ctx.File(originalFile)
}
fileGeneratorLock.RLock()
if err := ctx.File(file); err != echo.ErrNotFound {
fileGeneratorLock.RUnlock()
return err
}
fileGeneratorLock.RUnlock()
fileGeneratorLock.Lock()
defer fileGeneratorLock.Unlock()
return ctx.ServeCallbackContent(func(_ echo.Context) (io.Reader, error) {
storerName := local.Name
newStore := upload.StorerGet(storerName)
if newStore == nil {
return nil, ctx.E(`存储引擎“%s”未被登记`, storerName)
}
storer, err := newStore(ctx, typ)
if err != nil {
return nil, err
}
f, err := storer.Get(`/` + originalFile)
if err != nil {
return nil, echo.ErrNotFound
}
defer f.Close()
buf, err := convertFunc(f, 70)
if err != nil {
return nil, err
}
b := buf.Bytes()
saveFile := storer.URLToFile(`/` + file)
_, _, err = storer.Put(saveFile, buf, int64(len(b)))
return bytes.NewBuffer(b), err
}, path.Base(file), time.Now())
}