[WIP] v0.7.0 fixes and changes to cache and remotefetcher

pkg/remotefetcher/http.go

@@ -0,0 +1,60 @@
+package remotefetcher
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"io"
+	"net/http"
+
+	"gopkg.in/yaml.v3"
+)
+
+type HTTPFetcher struct {
+	HTTPClient *http.Client
+	config     FetcherConfig
+}
+
+// NewHTTPFetcher creates a new instance of HTTPFetcher with the provided options.
+func NewHTTPFetcher(options ...Option) *HTTPFetcher {
+	cfg := &FetcherConfig{}
+	for _, opt := range options {
+		opt(cfg)
+	}
+
+	// Initialize HTTP client if not provided
+	if cfg.HTTPClient == nil {
+		cfg.HTTPClient = http.DefaultClient
+	}
+
+	return &HTTPFetcher{HTTPClient: cfg.HTTPClient, config: *cfg}
+}
+
+// Fetch retrieves the file from the specified source URL
+func (h *HTTPFetcher) Fetch(source string) ([]byte, error) {
+	resp, err := http.Get(source)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound && h.config.IgnoreFileNotFound {
+		return nil, ErrFileNotFound
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, errors.New("failed to fetch remote config: " + resp.Status)
+	}
+
+	return io.ReadAll(resp.Body)
+}
+
+// Parse decodes the raw data into the provided target structure
+func (h *HTTPFetcher) Parse(data []byte, target interface{}) error {
+	return yaml.Unmarshal(data, target)
+}
+
+func (h *HTTPFetcher) Hash(data []byte) string {
+	hash := sha256.Sum256(data)
+	return hex.EncodeToString(hash[:])
+}