chore(all): move sub-packages to internal/provider

internal/provider/surfshark/updater/api.go

@@ -0,0 +1,76 @@
+package surfshark
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/qdm12/gluetun/internal/provider/surfshark/servers"
+)
+
+// Note: no multi-hop and some servers are missing from their API.
+func addServersFromAPI(ctx context.Context, client *http.Client,
+	hts hostToServer) (err error) {
+	data, err := fetchAPI(ctx, client)
+	if err != nil {
+		return err
+	}
+
+	locationData := servers.LocationData()
+	hostToLocation := hostToLocation(locationData)
+
+	const tcp, udp = true, true
+	for _, serverData := range data {
+		locationData := hostToLocation[serverData.Host] // TODO remove in v4
+		retroLoc := locationData.RetroLoc               // empty string if the host has no retro-compatible region
+		hts.add(serverData.Host, serverData.Region, serverData.Country,
+			serverData.Location, retroLoc, tcp, udp)
+	}
+
+	return nil
+}
+
+var (
+	ErrHTTPStatusCodeNotOK = errors.New("HTTP status code not OK")
+)
+
+type serverData struct {
+	Host     string `json:"connectionName"`
+	Region   string `json:"region"`
+	Country  string `json:"country"`
+	Location string `json:"location"`
+}
+
+func fetchAPI(ctx context.Context, client *http.Client) (
+	servers []serverData, err error) {
+	const url = "https://my.surfshark.com/vpn/api/v4/server/clusters"
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	response, err := client.Do(request)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%w: %d %s", ErrHTTPStatusCodeNotOK,
+			response.StatusCode, response.Status)
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&servers); err != nil {
+		return nil, fmt.Errorf("failed unmarshaling response body: %w", err)
+	}
+
+	if err := response.Body.Close(); err != nil {
+		return nil, err
+	}
+
+	return servers, nil
+}