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http_redirection.go
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http_redirection.go
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package http_client
import (
"errors"
"fmt"
"net"
"net/http"
"strings"
)
type (
HttpRedirectionPolicy interface {
Apply(req *http.Request, via []*http.Request) error
}
HttpRedirectionPolicyFunc func(*http.Request, []*http.Request) error
)
func (f HttpRedirectionPolicyFunc) Apply(req *http.Request, via []*http.Request) error {
return f(req, via)
}
func NoRedirectPolicy() HttpRedirectionPolicy {
return HttpRedirectionPolicyFunc(func(req *http.Request, via []*http.Request) error {
return errors.New("auto redirect is disabled")
})
}
func FlexibleRedirectPolicy(noOfRedirect int) HttpRedirectionPolicy {
return HttpRedirectionPolicyFunc(func(req *http.Request, via []*http.Request) error {
if len(via) >= noOfRedirect {
return fmt.Errorf("stopped after %d redirects", noOfRedirect)
}
checkHostAndAddHeaders(req, via[0])
return nil
})
}
func DomainCheckRedirectPolicy(hostnames ...string) HttpRedirectionPolicy {
hosts := make(map[string]bool)
for _, h := range hostnames {
hosts[strings.ToLower(h)] = true
}
fn := HttpRedirectionPolicyFunc(func(req *http.Request, via []*http.Request) error {
if ok := hosts[getHostname(req.URL.Host)]; !ok {
return errors.New("redirect is not allowed as per DomainCheckRedirectPolicy")
}
return nil
})
return fn
}
func getHostname(host string) (hostname string) {
if strings.Index(host, ":") > 0 {
host, _, _ = net.SplitHostPort(host)
}
hostname = strings.ToLower(host)
return
}
func checkHostAndAddHeaders(cur *http.Request, pre *http.Request) {
curHostname := getHostname(cur.URL.Host)
preHostname := getHostname(pre.URL.Host)
if strings.EqualFold(curHostname, preHostname) {
for key, val := range pre.Header {
cur.Header[key] = val
}
}
}