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

internal/provider/protonvpn/updater/api.go

@@ -0,0 +1,65 @@
+package protonvpn
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+)
+
+var (
+	ErrHTTPStatusCodeNotOK = errors.New("HTTP status code not OK")
+)
+
+type apiData struct {
+	LogicalServers []logicalServer
+}
+
+type logicalServer struct {
+	Name        string
+	ExitCountry string
+	Region      *string
+	City        *string
+	Servers     []physicalServer
+}
+
+type physicalServer struct {
+	EntryIP net.IP
+	ExitIP  net.IP
+	Domain  string
+	Status  uint8
+}
+
+func fetchAPI(ctx context.Context, client *http.Client) (
+	data apiData, err error) {
+	const url = "https://api.protonmail.ch/vpn/logicals"
+
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return data, err
+	}
+
+	response, err := client.Do(request)
+	if err != nil {
+		return data, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return data, fmt.Errorf("%w: %d %s", ErrHTTPStatusCodeNotOK,
+			response.StatusCode, response.Status)
+	}
+
+	decoder := json.NewDecoder(response.Body)
+	if err := decoder.Decode(&data); err != nil {
+		return data, fmt.Errorf("failed unmarshaling response body: %w", err)
+	}
+
+	if err := response.Body.Close(); err != nil {
+		return data, err
+	}
+
+	return data, nil
+}