/
driver.go
135 lines (94 loc) · 2.7 KB
/
driver.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
package native
import (
"bytes"
"context"
"fmt"
"image"
_ "log"
"github.com/aaronland/go-image-rotate"
iiifcache "github.com/go-iiif/go-iiif/v6/cache"
iiifconfig "github.com/go-iiif/go-iiif/v6/config"
iiifdriver "github.com/go-iiif/go-iiif/v6/driver"
iiifimage "github.com/go-iiif/go-iiif/v6/image"
iiifsource "github.com/go-iiif/go-iiif/v6/source"
"github.com/rwcarlsen/goexif/exif"
)
func init() {
dr, err := NewNativeDriver()
if err != nil {
panic(err)
}
iiifdriver.RegisterDriver("native", dr)
}
type NativeDriver struct {
iiifdriver.Driver
}
func NewNativeDriver() (iiifdriver.Driver, error) {
dr := &NativeDriver{}
return dr, nil
}
func (dr *NativeDriver) NewImageFromConfigWithSource(config *iiifconfig.Config, src iiifsource.Source, id string) (iiifimage.Image, error) {
body, err := src.Read(id)
if err != nil {
return nil, fmt.Errorf("Failed to read body for '%s', %w", id, err)
}
buf := bytes.NewBuffer(body)
img, img_fmt, err := image.Decode(buf)
if err != nil {
return nil, err
}
if img_fmt == "jpeg" {
ctx := context.Background()
br := bytes.NewReader(body)
o, err := rotate.GetImageOrientation(ctx, br)
if err != nil && !exif.IsCriticalError(err) {
return nil, fmt.Errorf("Failed to derive image orientation for '%s', %w", id, err)
}
if o != "0" {
new_img, err := rotate.RotateImageWithOrientation(ctx, img, o)
if err != nil {
return nil, fmt.Errorf("Failed to rotate image with orientation '%s' for '%s', %w", o, id, err)
}
img = new_img
}
}
im := NativeImage{
config: config,
source: src,
source_id: id,
id: id,
img: img,
format: img_fmt,
}
return &im, nil
}
func (dr *NativeDriver) NewImageFromConfigWithCache(config *iiifconfig.Config, cache iiifcache.Cache, id string) (iiifimage.Image, error) {
var image iiifimage.Image
body, err := cache.Get(id)
if err == nil {
source, err := iiifsource.NewMemorySource(body)
if err != nil {
return nil, fmt.Errorf("Failed to derive memory source for '%s', %w", id, err)
}
image, err = dr.NewImageFromConfigWithSource(config, source, id)
if err != nil {
return nil, fmt.Errorf("Failed to derive image from source for '%s', %w", id, err)
}
} else {
image, err = dr.NewImageFromConfig(config, id)
if err != nil {
return nil, fmt.Errorf("Failed to derive image from config for '%s', %w", id, err)
}
go func() {
cache.Set(id, image.Body())
}()
}
return image, nil
}
func (dr *NativeDriver) NewImageFromConfig(config *iiifconfig.Config, id string) (iiifimage.Image, error) {
source, err := iiifsource.NewSourceFromConfig(config)
if err != nil {
return nil, err
}
return dr.NewImageFromConfigWithSource(config, source, id)
}