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4fde58d57e
The RFC7239 is the standard way to define headers about reverse proxy redirections. It replaces all the X-Forwarded-* previous way of defining them. We let the previous implementations exist to avoid breaking existant installations.
95 lines
2.7 KiB
Go
95 lines
2.7 KiB
Go
package location
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import (
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"net/http"
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"strings"
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"github.com/gin-gonic/gin"
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)
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// Resolve is a middleware function that resolves the hostname
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// and scheme for the http.Request and adds to the context.
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func Resolve(c *gin.Context) {
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c.Set("host", resolveHost(c.Request))
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c.Set("scheme", resolveScheme(c.Request))
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c.Next()
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}
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// parseHeader parses non unique headers value
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// from a http.Request and return a slice of the values
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// queried from the header
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func parseHeader(r *http.Request, header string, token string) (val []string) {
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for _, v := range r.Header[header] {
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options := strings.Split(v, ";")
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for _, o := range options {
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keyvalue := strings.Split(o, "=")
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var key, value string
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if len(keyvalue) > 1 {
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key, value = strings.TrimSpace(keyvalue[0]), strings.TrimSpace(keyvalue[1])
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}
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key = strings.ToLower(key)
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if key == token {
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val = append(val, value)
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}
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}
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}
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return
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}
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// resolveScheme is a helper function that evaluates the http.Request
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// and returns the scheme, HTTP or HTTPS. It is able to detect,
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// using the X-Forwarded-Proto, if the original request was HTTPS
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// and routed through a reverse proxy with SSL termination.
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func resolveScheme(r *http.Request) string {
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switch {
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case r.URL.Scheme == "https":
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return "https"
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case r.TLS != nil:
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return "https"
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case strings.HasPrefix(r.Proto, "HTTPS"):
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return "https"
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case r.Header.Get("X-Forwarded-Proto") == "https":
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return "https"
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case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "proto")) != 0 && parseHeader(r, "Forwarded", "proto")[0] == "https":
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return "https"
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default:
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return "http"
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}
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}
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// resolveHost is a helper function that evaluates the http.Request
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// and returns the hostname. It is able to detect, using the
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// X-Forarded-For header, the original hostname when routed
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// through a reverse proxy.
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func resolveHost(r *http.Request) string {
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switch {
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case len(r.Host) != 0:
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return r.Host
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case len(r.URL.Host) != 0:
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return r.URL.Host
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case len(r.Header.Get("X-Forwarded-For")) != 0:
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return r.Header.Get("X-Forwarded-For")
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case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "for")) != 0:
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return parseHeader(r, "Forwarded", "for")[0]
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case len(r.Header.Get("X-Host")) != 0:
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return r.Header.Get("X-Host")
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case len(r.Header.Get("Forwarded")) != 0 && len(parseHeader(r, "Forwarded", "host")) != 0:
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return parseHeader(r, "Forwarded", "host")[0]
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case len(r.Header.Get("XFF")) != 0:
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return r.Header.Get("XFF")
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case len(r.Header.Get("X-Real-IP")) != 0:
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return r.Header.Get("X-Real-IP")
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default:
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return "localhost:8000"
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}
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}
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// Hostname returns the hostname associated with
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// the current context.
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func Hostname(c *gin.Context) (host string) {
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v, ok := c.Get("host")
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if ok {
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host = v.(string)
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}
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return
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}
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