1 local alphabet = {

2 "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",

3 "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",

4 "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",

5 "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",

6 "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/"

7 }

8

9 local function encode_base64(str)

10 local parts = {}

11 local pos = 1

12 local block_count = 0

13 while pos <= #str do

14 local s = string.sub(str, pos, pos + 2)

15 local n = 0

16 for i = 1, 3 do

17 n = n * 256

18 if i <= #s then

19 n = n + string.byte(string.sub(s, i, i))

20 end

21 end

22 parts[#parts+1] = alphabet[math.floor(n / 262144) + 1]

23 parts[#parts+1] = alphabet[math.floor(n / 4096) % 64 + 1]

24 if #s > 1 then

25 parts[#parts+1] = alphabet[math.floor(n / 64) % 64 + 1]

26 else

27 parts[#parts+1] = "="

28 end

29 if #s > 2 then

30 parts[#parts+1] = alphabet[n % 64 + 1]

31 else

32 parts[#parts+1] = "="

33 end

34 block_count = block_count + 1

35 if block_count == 19 then

36 --parts[#parts+1] = "\r\n"

37 block_count = 0

38 end

39 pos = pos + #s

40 end

41 if block_count > 0 then

42 --parts[#parts+1] = "\r\n"

43 end

44 return table.concat(parts)

45 end

46

47 function ui.avatar(member, size)

48 local base64_string

49

50 if member.avatar_base64 then

51 base64_string = member.avatar_base64

52 else

53 local member_image = MemberImage:by_pk(member.id, "avatar", true)

54 if member_image then

55 base64_string = encode_base64(member_image.data)

56 else

57 base64_string = "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"

58 end

59 member.avatar_base64 = base64_string

60 member:save()

61 end

62

63 ui.tag{ tag = "img", attr = { class = "avatar_image", src = "data:image/jpeg;base64," .. base64_string } }

64

65 end

66