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resolver.go
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resolver.go
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// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package namespace
import (
"net"
"net/http"
"strings"
"golang.org/x/net/publicsuffix"
log "github.com/vine-io/vine/lib/logger"
)
func NewResolver(svcType, namespace string) *Resolver {
return &Resolver{svcType, namespace}
}
// Resolver determines the namespace for a request
type Resolver struct {
svcType string
namespace string
}
func (r Resolver) String() string {
return "internal/namespace"
}
func (r Resolver) ResolveWithType(req *http.Request) string {
return r.Resolve(req) + "." + r.svcType
}
func (r Resolver) Resolve(req *http.Request) string {
// check to see what the provided namespace is, we only do
// domain mapping if the namespace is set to 'domain'
if r.namespace != "domain" {
return r.namespace
}
// determine the host, e.g. dev.vine.mu:8080
host := req.URL.Hostname()
if len(host) == 0 {
if h, _, err := net.SplitHostPort(req.Host); err == nil {
host = h // host does contain a port
} else if strings.Contains(err.Error(), "missing port in address") {
host = string(req.Host) // host does not contain a port
}
}
// check for an ip address
if net.ParseIP(host) != nil {
return DefaultNamespace
}
// check for dev enviroment
if host == "localhost" || host == "127.0.0.1" {
return DefaultNamespace
}
// extract the top level domain plus one (e.g. 'myapp.com')
domain, err := publicsuffix.EffectiveTLDPlusOne(host)
if err != nil {
log.Debugf("Unable to extract domain from %v", host)
return DefaultNamespace
}
// check to see if the domain matches the host of vine.mu, in
// these cases we return the default namespace
if domain == host || domain == "vine.mu" {
return DefaultNamespace
}
// remove the domain from the host, leaving the subdomain
subdomain := strings.TrimSuffix(host, "."+domain)
// return the reversed subdomain as the namespace
comps := strings.Split(subdomain, ".")
for i := len(comps)/2 - 1; i >= 0; i-- {
opp := len(comps) - 1 - i
comps[i], comps[opp] = comps[opp], comps[i]
}
return strings.Join(comps, ".")
}