-
Notifications
You must be signed in to change notification settings - Fork 0
/
images.go
148 lines (123 loc) · 3.07 KB
/
images.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
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
package util
import (
"errors"
"image"
"image/jpeg"
"image/png"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/gocraft/web"
"github.com/nfnt/resize"
)
func DeleteImagesWithPrefix(prefix string) error {
pathS := "./data/images/"
filepath.Walk(pathS, func(path string, f os.FileInfo, _ error) error {
if !f.IsDir() {
if strings.Contains(f.Name(), prefix) {
err := os.Remove(path)
if err != nil {
return err
}
}
}
return nil
})
return nil
}
func SaveImage(r *web.Request, field string, maxWidth uint, uuid string) error {
file, handler, _ := r.FormFile(field)
if file == nil {
return errors.New("No file provided")
}
defer file.Close()
var image image.Image
mimeType := handler.Header["Content-Type"][0]
switch mimeType {
case "image/jpeg", "image/jpg":
image, _ = jpeg.Decode(file)
case "image/png":
image, _ = png.Decode(file)
default:
return errors.New("Wrong image extension")
}
DeleteImagesWithPrefix(uuid)
out, _ := os.Create("./data/images/" + uuid + ".jpeg")
defer out.Close()
resized := resize.Resize(maxWidth, 0, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
return nil
}
func ResizeImage(infilename, outfilename string, size string) error {
file, err := os.Open(infilename)
defer file.Close()
if err != nil {
return err
}
image, err := jpeg.Decode(file)
if err != nil {
return err
}
out, err := os.Create(outfilename)
defer out.Close()
if err != nil {
return err
}
switch size {
case "small":
resized := resize.Resize(32, 32, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
case "728x90":
resized := resize.Resize(728, 0, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
case "200x200":
resized := resize.Resize(200, 0, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
case "230x230":
resized := resize.Resize(230, 230, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
case "300x300":
resized := resize.Resize(300, 0, image, resize.Bilinear)
jpeg.Encode(out, resized, nil)
}
return nil
}
func ServeImage(filename, size string, w web.ResponseWriter, r *web.Request) error {
w.Header().Set("Content-type", "image/jpeg")
w.Header().Set("Cache-control", "public, max-age=259200")
originalFilename := "./data/images/" + filename + ".jpeg"
resizedFilename := "./data/images/" + filename + "_" + size + ".jpeg"
file := &os.File{}
switch size {
case "normal":
f, err := os.Open(originalFilename)
defer f.Close()
if err != nil {
return err
}
file = f
case "200x200", "728x90", "small", "300x300", "230x230":
resizedFile, err := os.Open(resizedFilename)
defer resizedFile.Close()
if err != nil { // image does not exist. resize
ResizeImage(originalFilename, resizedFilename, size)
newlyResizedFile, err := os.Open(resizedFilename)
defer newlyResizedFile.Close()
if err != nil {
return err
}
file = newlyResizedFile
} else {
file = resizedFile
}
}
fi, err := file.Stat()
if err != nil {
return err
}
w.Header().Set("Content-Length", strconv.FormatInt(fi.Size(), 10))
io.Copy(w, file)
return nil
}