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package sync
import (
"encoding/json"
"fmt"
"io"
"net/http"
"time"
"vpnem/internal/models"
)
// Fetcher pulls configuration from the vpnem server API.
type Fetcher struct {
baseURL string
client *http.Client
}
// NewFetcher creates a new Fetcher.
func NewFetcher(baseURL string) *Fetcher {
return &Fetcher{
baseURL: baseURL,
client: &http.Client{
Timeout: 15 * time.Second,
},
}
}
// FetchServers retrieves the server list from the API.
func (f *Fetcher) FetchServers() (*models.ServersResponse, error) {
var resp models.ServersResponse
if err := f.getJSON("/api/v1/servers", &resp); err != nil {
return nil, fmt.Errorf("fetch servers: %w", err)
}
return &resp, nil
}
// FetchRuleSets retrieves the rule-set manifest from the API.
func (f *Fetcher) FetchRuleSets() (*models.RuleSetManifest, error) {
var resp models.RuleSetManifest
if err := f.getJSON("/api/v1/ruleset/manifest", &resp); err != nil {
return nil, fmt.Errorf("fetch rulesets: %w", err)
}
return &resp, nil
}
// FetchVersion retrieves the latest client version info.
func (f *Fetcher) FetchVersion() (*models.VersionResponse, error) {
var resp models.VersionResponse
if err := f.getJSON("/api/v1/version", &resp); err != nil {
return nil, fmt.Errorf("fetch version: %w", err)
}
return &resp, nil
}
// ServerIPs extracts all unique server IPs from the server list.
func ServerIPs(servers []models.Server) []string {
seen := make(map[string]bool)
var ips []string
for _, s := range servers {
if !seen[s.Server] {
seen[s.Server] = true
ips = append(ips, s.Server)
}
}
return ips
}
func (f *Fetcher) getJSON(path string, v any) error {
resp, err := f.client.Get(f.baseURL + path)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, _ := io.ReadAll(resp.Body)
return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
}
return json.NewDecoder(resp.Body).Decode(v)
}
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