bsw@211: local alphabet = {
bsw@211:   "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
bsw@211:   "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
bsw@211:   "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
bsw@211:   "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
bsw@211:   "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/"
bsw@211: }
bsw@211: 
bsw@211: local function encode_base64(str)
bsw@211:   local parts = {}
bsw@211:   local pos = 1
bsw@211:   local block_count = 0
bsw@211:   while pos <= #str do
bsw@211:     local s = string.sub(str, pos, pos + 2)
bsw@211:     local n = 0
bsw@211:     for i = 1, 3 do
bsw@211:       n = n * 256
bsw@211:       if i <= #s then
bsw@211:         n = n + string.byte(string.sub(s, i, i))
bsw@211:       end
bsw@211:     end
bsw@211:     parts[#parts+1] = alphabet[math.floor(n / 262144) + 1]
bsw@211:     parts[#parts+1] = alphabet[math.floor(n / 4096) % 64 + 1]
bsw@211:     if #s > 1 then
bsw@211:       parts[#parts+1] = alphabet[math.floor(n / 64) % 64 + 1]
bsw@211:     else
bsw@211:       parts[#parts+1] = "="
bsw@211:     end
bsw@211:     if #s > 2 then
bsw@211:       parts[#parts+1] = alphabet[n % 64 + 1]
bsw@211:     else
bsw@211:       parts[#parts+1] = "="
bsw@211:     end
bsw@211:     block_count = block_count + 1
bsw@211:     if block_count == 19 then
bsw@211:       --parts[#parts+1] = "\r\n"
bsw@211:       block_count = 0
bsw@211:     end
bsw@211:     pos = pos + #s
bsw@211:   end
bsw@211:   if block_count > 0 then
bsw@211:     --parts[#parts+1] = "\r\n"
bsw@211:   end
bsw@211:   return table.concat(parts)
bsw@211: end
bsw@211: 
bsw@211: function ui.avatar(member, size)
bsw@211:   local base64_string
bsw@211:   
bsw@211:   if member.avatar_base64 then
bsw@211:     base64_string = member.avatar_base64
bsw@211:   else
bsw@211:     local member_image = MemberImage:by_pk(member.id, "avatar", true)
bsw@211:     if member_image then
bsw@211:       base64_string = encode_base64(member_image.data)
bsw@211:     else
bsw@211:       base64_string = "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"
bsw@211:     end
bsw@211:     member.avatar_base64 = base64_string
bsw@211:     member:save()
bsw@211:   end
bsw@211: 
bsw@216:   ui.tag{ tag = "img", attr = { class = "avatar_image", src = "data:image/jpeg;base64," .. base64_string } }
bsw@211:   
bsw@211: end
bsw@211: