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40 lines
1.0 KiB
40 lines
1.0 KiB
package main
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import (
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"net/http"
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"net/url"
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)
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// Do a strict referrer check, matching against both the Origin header (if
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// present) and the Referrer header. If a list of headers is specified, then
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// Referrer checking will be skipped if any of those headers are present.
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func strictReferrerCheck(r *http.Request, prefix string, whitelistHeaders []string, allowBlank bool) bool {
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p, _ := url.Parse(prefix)
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// if there's an Origin header, check it and skip other checks
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if origin := r.Header.Get("Origin"); origin != "" {
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u, _ := url.Parse(origin)
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return sameOrigin(u, p)
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}
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for _, header := range whitelistHeaders {
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if r.Header.Get(header) != "" {
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return true
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}
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}
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referrer := r.Header.Get("Referer")
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if allowBlank && referrer == "" {
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return true
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}
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u, _ := url.Parse(referrer)
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return sameOrigin(u, p)
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}
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// Check if two URLs have the same origin
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func sameOrigin(u1, u2 *url.URL) bool {
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// host also contains the port if one was specified
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return (u1.Scheme == u2.Scheme && u1.Host == u2.Host)
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}
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