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proxy.go
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proxy.go
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// Package header_pattern_proxy
package header_pattern_proxy
import (
"context"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"regexp"
)
// Config the plugin configuration.
type Config struct {
Header string `json:"headers,omitempty"` // target header
Mapping map[string]string `json:"mapping,omitempty"` // mapping holding (regex, target) pairs
}
// CreateConfig creates the default plugin configuration.
func CreateConfig() *Config {
return &Config{
Header: "",
Mapping: make(map[string]string),
}
}
type SiteProxy struct {
config *Config
next http.Handler
name string
}
// New created a new SiteProxy plugin.
func New(ctx context.Context, next http.Handler, config *Config, name string) (http.Handler, error) {
if len(config.Header) == 0 {
return nil, fmt.Errorf("header cannot be empty")
}
if len(config.Mapping) == 0 {
return nil, fmt.Errorf("mapping cannot be empty")
}
return &SiteProxy{
config: config,
next: next,
name: name,
}, nil
}
func (a *SiteProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
for pattern, destination := range a.config.Mapping {
matched, _ := regexp.MatchString(pattern, req.Header.Get(a.config.Header))
if matched {
destinationUrl, err := url.Parse(destination)
if err != nil {
continue
}
proxy := httputil.NewSingleHostReverseProxy(destinationUrl)
proxy.ServeHTTP(rw, req)
}
}
a.next.ServeHTTP(rw, req)
}