1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84

// Copyright 2014 The Gogs Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package avatar

import (
	"bytes"
	"fmt"
	"image"
	"image/color"

	_ "image/gif"  // for processing gif images
	_ "image/jpeg" // for processing jpeg images
	_ "image/png"  // for processing png images

	"code.gitea.io/gitea/modules/avatar/identicon"
	"code.gitea.io/gitea/modules/setting"

	"github.com/nfnt/resize"
	"github.com/oliamb/cutter"
)

// AvatarSize returns avatar's size
const AvatarSize = 290

// RandomImageSize generates and returns a random avatar image unique to input data
// in custom size (height and width).
func RandomImageSize(size int, data []byte) (image.Image, error) {
	// we use white as background, and use dark colors to draw blocks
	imgMaker, err := identicon.New(size, color.White, identicon.DarkColors...)
	if err != nil {
		return nil, fmt.Errorf("identicon.New: %w", err)
	}
	return imgMaker.Make(data), nil
}

// RandomImage generates and returns a random avatar image unique to input data
// in default size (height and width).
func RandomImage(data []byte) (image.Image, error) {
	return RandomImageSize(AvatarSize, data)
}

// Prepare accepts a byte slice as input, validates it contains an image of an
// acceptable format, and crops and resizes it appropriately.
func Prepare(data []byte) (*image.Image, error) {
	imgCfg, _, err := image.DecodeConfig(bytes.NewReader(data))
	if err != nil {
		return nil, fmt.Errorf("DecodeConfig: %w", err)
	}
	if imgCfg.Width > setting.Avatar.MaxWidth {
		return nil, fmt.Errorf("Image width is too large: %d > %d", imgCfg.Width, setting.Avatar.MaxWidth)
	}
	if imgCfg.Height > setting.Avatar.MaxHeight {
		return nil, fmt.Errorf("Image height is too large: %d > %d", imgCfg.Height, setting.Avatar.MaxHeight)
	}

	img, _, err := image.Decode(bytes.NewReader(data))
	if err != nil {
		return nil, fmt.Errorf("Decode: %w", err)
	}

	if imgCfg.Width != imgCfg.Height {
		var newSize, ax, ay int
		if imgCfg.Width > imgCfg.Height {
			newSize = imgCfg.Height
			ax = (imgCfg.Width - imgCfg.Height) / 2
		} else {
			newSize = imgCfg.Width
			ay = (imgCfg.Height - imgCfg.Width) / 2
		}

		img, err = cutter.Crop(img, cutter.Config{
			Width:  newSize,
			Height: newSize,
			Anchor: image.Point{ax, ay},
		})
		if err != nil {
			return nil, err
		}
	}

	img = resize.Resize(AvatarSize, AvatarSize, img, resize.Bilinear)
	return &img, nil
}