37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package cookiebanner
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import "net"
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// AnonymizeIP truncates an IP address for GDPR compliance.
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// IPv4: zeroes the last octet (e.g. 192.168.1.123 -> 192.168.1.0).
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// IPv6: zeroes the last 80 bits (/48 mask, e.g. 2001:db8:1:2:3:4:5:6 -> 2001:db8:1::).
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func AnonymizeIP(raw string) string {
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ip := net.ParseIP(raw)
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if ip == nil {
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return raw
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}
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if v4 := ip.To4(); v4 != nil {
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v4[3] = 0
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return v4.String()
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}
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mask := net.CIDRMask(48, 128)
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return ip.Mask(mask).String()
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}
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