Allow fetching releases from multiple sources

internal/feed/dockerhub.go

@@ -0,0 +1,58 @@
+package feed
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+type dockerHubRepositoryTagsResponse struct {
+	Results []struct {
+		Name       string `json:"name"`
+		LastPushed string `json:"tag_last_pushed"`
+	} `json:"results"`
+}
+
+const dockerHubReleaseNotesURLFormat = "https://hub.docker.com/r/%s/tags?name=%s"
+
+func fetchLatestDockerHubRelease(request *ReleaseRequest) (*AppRelease, error) {
+	parts := strings.Split(request.Repository, "/")
+
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("invalid repository name: %s", request.Repository)
+	}
+
+	httpRequest, err := http.NewRequest(
+		"GET",
+		fmt.Sprintf("https://hub.docker.com/v2/namespaces/%s/repositories/%s/tags", parts[0], parts[1]),
+		nil,
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if request.Token != nil {
+		httpRequest.Header.Add("Authorization", "Bearer "+(*request.Token))
+	}
+
+	response, err := decodeJsonFromRequest[dockerHubRepositoryTagsResponse](defaultClient, httpRequest)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if len(response.Results) == 0 {
+		return nil, fmt.Errorf("no tags found for repository: %s", request.Repository)
+	}
+
+	tag := response.Results[0]
+
+	return &AppRelease{
+		Source:       ReleaseSourceDockerHub,
+		NotesUrl:     fmt.Sprintf(dockerHubReleaseNotesURLFormat, request.Repository, tag.Name),
+		Name:         request.Repository,
+		Version:      tag.Name,
+		TimeReleased: parseRFC3339Time(tag.LastPushed),
+	}, nil
+}