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It works by using the Host of the request. When it receives something in the form of: `<node>.<session>.play-with-docker.com` it does a reverse proxy http request to `node`, validating that the `node` actually belongs to the `session`. If the node has a prefix `ip` and continues with a valid IP address where the dots where replaces by underscores (like `ip10_0_0_1`) then it will remove the `ip` prefix and and replace the underscores by dots, and assume it is an ip address.
38 lines
749 B
Go
38 lines
749 B
Go
package handlers
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import (
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"net"
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"net/http"
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"net/http/httputil"
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"strings"
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"github.com/gorilla/mux"
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)
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func NewMultipleHostReverseProxy() *httputil.ReverseProxy {
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director := func(req *http.Request) {
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v := mux.Vars(req)
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node := v["node"]
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if strings.HasPrefix(node, "ip") {
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// Node is actually an ip, need to convert underscores by dots.
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ip := strings.Replace(strings.TrimPrefix(node, "ip"), "_", ".", -1)
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if net.ParseIP(ip) == nil {
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// Not a valid IP, so treat this is a hostname.
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} else {
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node = ip
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}
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}
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// Validate that the node actually exists in the network
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// TODO:
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// Only proxy http for now
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req.URL.Scheme = "http"
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req.URL.Host = node
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}
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return &httputil.ReverseProxy{Director: director}
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}
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