68 lines
1.7 KiB
Go
68 lines
1.7 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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// 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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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("X-Host")) != 0:
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return r.Header.Get("X-Host")
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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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