4c57d201a4
The source headers, LICENSE files, and license metadata had drifted apart. Align the entire project to MIT: - Convert every source-file header to the MIT text across all comment styles (Go, TS, TSX, JS, MJS, SQL, CSS, GraphQL, shell), including SPDX-License-Identifier tags - Set the root and cookie-banner LICENSE files to the MIT text with a "MIT License" title line - Switch the package.json license fields, Docker image label, and cookie-banner README to MIT - Update docs and the genmodels header generator accordingly - Normalize copyright lines to a single format (Copyright (c) <year(s)> Probo Inc <hello@probo.com>.): unify the hello@getprobo.com and hello@probo.inc emails to hello@probo.com and the comma-separated years to a hyphenated range Genuine third-party references are intentionally left untouched: the Lucide icon attributions (Lucide is ISC) and the trivy dependency license allowlist. Signed-off-by: Sacha Al Himdani <sacha@probo.com>
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package clientip
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import (
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"net"
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"net/http"
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"strings"
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)
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// Extract resolves the client IP address from standard proxy headers
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// in priority order: RFC 7239 Forwarded, then X-Forwarded-For, then
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// the connection's remote address. It takes the rightmost (last)
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// entry from multi-value headers — the one appended by the trusted
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// load balancer closest to us.
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func Extract(r *http.Request) string {
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if fwd := r.Header.Get("Forwarded"); fwd != "" {
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if ip := parseForwardedFor(fwd); net.ParseIP(ip) != nil {
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return ip
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}
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}
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if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
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if ip := parseXForwardedFor(xff); net.ParseIP(ip) != nil {
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return ip
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}
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}
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return extractRemoteAddr(r.RemoteAddr)
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}
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func parseXForwardedFor(xff string) string {
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if i := strings.LastIndexByte(xff, ','); i != -1 {
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xff = xff[i+1:]
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}
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xff = strings.TrimSpace(xff)
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if ip, _, err := net.SplitHostPort(xff); err == nil {
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return ip
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}
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return xff
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}
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func extractRemoteAddr(remoteAddr string) string {
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ip, _, err := net.SplitHostPort(remoteAddr)
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if err != nil {
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return remoteAddr
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}
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return ip
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}
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// parseForwardedFor extracts the client IP from the last "for=" directive
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// of an RFC 7239 Forwarded header value.
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func parseForwardedFor(header string) string {
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if i := strings.LastIndexByte(header, ','); i != -1 {
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header = header[i+1:]
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}
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for part := range strings.SplitSeq(header, ";") {
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part = strings.TrimSpace(part)
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if !strings.HasPrefix(strings.ToLower(part), "for=") {
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continue
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}
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val := part[4:]
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val = strings.Trim(val, "\"")
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if strings.HasPrefix(val, "[") {
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if end := strings.IndexByte(val, ']'); end != -1 {
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return val[1:end]
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}
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}
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if ip, _, err := net.SplitHostPort(val); err == nil {
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return ip
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}
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return val
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}
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return ""
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}
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