emissary/internal/proxy/host_rewrite.go

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package proxy
import (
"net/http"
"net/url"
"sort"
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"forge.cadoles.com/Cadoles/emissary/internal/proxy/wildcard"
"gitlab.com/wpetit/goweb/logger"
)
func RewriteHosts(mappings map[string]*url.URL) Middleware {
patterns := make([]string, len(mappings))
for p := range mappings {
patterns = append(patterns, p)
}
sort.Strings(patterns)
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reverse(patterns)
return func(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
var match *url.URL
for _, p := range patterns {
logger.Debug(ctx, "matching host to pattern", logger.F("host", r.Host), logger.F("pattern", p))
if matches := wildcard.Match(r.Host, p); !matches {
continue
}
match = mappings[p]
break
}
if match == nil {
h.ServeHTTP(w, r)
return
}
ctx = logger.With(ctx, logger.F("originalHost", r.Host))
r = r.WithContext(ctx)
originalURL := r.URL.String()
r.URL.Host = match.Host
r.URL.Scheme = match.Scheme
logger.Debug(ctx, "rewriting url", logger.F("from", originalURL), logger.F("to", r.URL.String()))
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
}
func WithRewriteHosts(mappings map[string]*url.URL) OptionFunc {
return func(o *Options) {
o.Middlewares = append(o.Middlewares, RewriteHosts(mappings))
}
}