Allow fetching releases from multiple sources

internal/feed/gitlab.go

@@ -0,0 +1,54 @@
+package feed
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+type gitlabReleaseResponseJson struct {
+	TagName    string `json:"tag_name"`
+	ReleasedAt string `json:"released_at"`
+	Links      struct {
+		Self string `json:"self"`
+	} `json:"_links"`
+}
+
+func fetchLatestGitLabRelease(request *ReleaseRequest) (*AppRelease, error) {
+	httpRequest, err := http.NewRequest(
+		"GET",
+		fmt.Sprintf(
+			"https://gitlab.com/api/v4/projects/%s/releases/permalink/latest",
+			url.QueryEscape(request.Repository),
+		),
+		nil,
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if request.Token != nil {
+		httpRequest.Header.Add("PRIVATE-TOKEN", *request.Token)
+	}
+
+	response, err := decodeJsonFromRequest[gitlabReleaseResponseJson](defaultClient, httpRequest)
+
+	if err != nil {
+		return nil, err
+	}
+
+	version := response.TagName
+
+	if len(version) > 0 && version[0] != 'v' {
+		version = "v" + version
+	}
+
+	return &AppRelease{
+		Source:       ReleaseSourceGitlab,
+		Name:         request.Repository,
+		Version:      version,
+		NotesUrl:     response.Links.Self,
+		TimeReleased: parseRFC3339Time(response.ReleasedAt),
+	}, nil
+}