Query ArtifactHub for repo suggestion (#225)

* Query ArtifactHub for repo suggestion

* Refactor & improve

* Add notice on local chart support

pkg/dashboard/objects/artifacthub.go

@@ -0,0 +1,90 @@
+package objects
+
+import (
+	"encoding/json"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	neturl "net/url"
+	"os"
+	"sync"
+)
+
+var mxArtifactHub sync.Mutex
+
+func QueryArtifactHub(chartName string) ([]*ArtifactHubResult, error) {
+	mxArtifactHub.Lock() // to avoid parallel request spike
+	defer mxArtifactHub.Unlock()
+
+	url := os.Getenv("HD_ARTIFACT_HUB_URL")
+	if url == "" {
+		url = "https://artifacthub.io/api/v1/packages/search"
+	}
+
+	p, err := neturl.Parse(url)
+	if err != nil {
+		return nil, err
+	}
+
+	p.RawQuery = "offset=0&limit=5&facets=false&kind=0&deprecated=false&sort=relevance&ts_query_web=" + neturl.QueryEscape(chartName)
+
+	req, err := http.NewRequest("GET", p.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("User-Agent", "Komodor Helm Dashboard/"+os.Getenv("HD_VERSION")) // TODO
+
+	log.Debugf("Making HTTP request: %v", req)
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	if res.StatusCode != 200 {
+		return nil, fmt.Errorf("failed to fetch %s : %s", p.String(), res.Status)
+	}
+
+	result := ArtifactHubResults{}
+
+	err = json.NewDecoder(res.Body).Decode(&result)
+	if err != nil {
+		return nil, err
+	}
+
+	return result.Packages, nil
+}
+
+type ArtifactHubResults struct {
+	Packages []*ArtifactHubResult `json:"packages"`
+}
+
+type ArtifactHubResult struct {
+	PackageId                    string          `json:"package_id"`
+	Name                         string          `json:"name"`
+	NormalizedName               string          `json:"normalized_name"`
+	LogoImageId                  string          `json:"logo_image_id"`
+	Stars                        int             `json:"stars"`
+	Description                  string          `json:"description"`
+	Version                      string          `json:"version"`
+	AppVersion                   string          `json:"app_version"`
+	Deprecated                   bool            `json:"deprecated"`
+	Signed                       bool            `json:"signed"`
+	ProductionOrganizationsCount int             `json:"production_organizations_count"`
+	Ts                           int             `json:"ts"`
+	Repository                   ArtifactHubRepo `json:"repository"`
+}
+
+type ArtifactHubRepo struct {
+	Url                     string `json:"url"`
+	Kind                    int    `json:"kind"`
+	Name                    string `json:"name"`
+	Official                bool   `json:"official"`
+	DisplayName             string `json:"display_name"`
+	RepositoryId            string `json:"repository_id"`
+	ScannerDisabled         bool   `json:"scanner_disabled"`
+	OrganizationName        string `json:"organization_name"`
+	VerifiedPublisher       bool   `json:"verified_publisher"`
+	OrganizationDisplayName string `json:"organization_display_name"`
+}