diff options
Diffstat (limited to 'plugins/omemo/src/ui/util.vala')
| -rw-r--r-- | plugins/omemo/src/ui/util.vala | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/plugins/omemo/src/ui/util.vala b/plugins/omemo/src/ui/util.vala new file mode 100644 index 00000000..88d30b3b --- /dev/null +++ b/plugins/omemo/src/ui/util.vala @@ -0,0 +1,60 @@ +namespace Dino.Plugins.Omemo { + +public static string fingerprint_from_base64(string b64) { + uint8[] arr = Base64.decode(b64); + + arr = arr[1:arr.length]; + string s = ""; + foreach (uint8 i in arr) { + string tmp = i.to_string("%x"); + if (tmp.length == 1) tmp = "0" + tmp; + s = s + tmp; + } + + return s; +} + +public static string fingerprint_markup(string s) { + string markup = ""; + for (int i = 0; i < s.length; i += 4) { + string four_chars = s.substring(i, 4).down(); + + int raw = (int) four_chars.to_long(null, 16); + uint8[] bytes = {(uint8) ((raw >> 8) & 0xff - 128), (uint8) (raw & 0xff - 128)}; + + Checksum checksum = new Checksum(ChecksumType.SHA1); + checksum.update(bytes, bytes.length); + uint8[] digest = new uint8[20]; + size_t len = 20; + checksum.get_digest(digest, ref len); + + uint8 r = digest[0]; + uint8 g = digest[1]; + uint8 b = digest[2]; + + if (r == 0 && g == 0 && b == 0) r = g = b = 1; + + double brightness = 0.2126 * r + 0.7152 * g + 0.0722 * b; + + if (brightness < 80) { + double factor = 80.0 / brightness; + r = uint8.min(255, (uint8) (r * factor)); + g = uint8.min(255, (uint8) (g * factor)); + b = uint8.min(255, (uint8) (b * factor)); + + } else if (brightness > 180) { + double factor = 180.0 / brightness; + r = (uint8) (r * factor); + g = (uint8) (g * factor); + b = (uint8) (b * factor); + } + + if (i % 32 == 0 && i != 0) markup += "\n"; + markup += @"<span foreground=\"$("#%02x%02x%02x".printf(r, g, b))\">$four_chars</span>"; + if (i % 8 == 4 && i % 32 != 28) markup += " "; + } + + return "<span font_family='monospace' font='8'>" + markup + "</span>"; +} + +}
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