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http.go
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http.go
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package hosts
import (
"bytes"
"context"
"encoding/json"
"net"
"net/http"
"github.com/dolfly/core/hosts"
"github.com/dolfly/core/logger"
ctxvalue "github.com/dolfly/x/ctx"
"github.com/dolfly/x/internal/plugin"
)
type httpPluginRequest struct {
Network string `json:"network"`
Host string `json:"host"`
Client string `json:"client"`
}
type httpPluginResponse struct {
IPs []string `json:"ips"`
OK bool `json:"ok"`
}
type httpPlugin struct {
url string
client *http.Client
header http.Header
log logger.Logger
}
// NewHTTPPlugin creates an HostMapper plugin based on HTTP.
func NewHTTPPlugin(name string, url string, opts ...plugin.Option) hosts.HostMapper {
var options plugin.Options
for _, opt := range opts {
opt(&options)
}
return &httpPlugin{
url: url,
client: plugin.NewHTTPClient(&options),
header: options.Header,
log: logger.Default().WithFields(map[string]any{
"kind": "hosts",
"hosts": name,
}),
}
}
func (p *httpPlugin) Lookup(ctx context.Context, network, host string, opts ...hosts.Option) (ips []net.IP, ok bool) {
p.log.Debugf("lookup %s/%s", host, network)
if p.client == nil {
return
}
rb := httpPluginRequest{
Network: network,
Host: host,
Client: string(ctxvalue.ClientIDFromContext(ctx)),
}
v, err := json.Marshal(&rb)
if err != nil {
return
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, p.url, bytes.NewReader(v))
if err != nil {
return
}
if p.header != nil {
req.Header = p.header.Clone()
}
req.Header.Set("Content-Type", "application/json")
resp, err := p.client.Do(req)
if err != nil {
return
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return
}
res := httpPluginResponse{}
if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
return
}
for _, s := range res.IPs {
if ip := net.ParseIP(s); ip != nil {
ips = append(ips, ip)
}
}
return ips, res.OK
}