portainer/api/http/handler/helm/helm_show.go

package helm

import (
	"fmt"
	"net/http"
	"net/url"

	"github.com/portainer/portainer/pkg/libhelm/options"
	httperror "github.com/portainer/portainer/pkg/libhttp/error"
	"github.com/portainer/portainer/pkg/libhttp/request"

	"github.com/pkg/errors"
	"github.com/rs/zerolog/log"
)

// @id HelmShow
// @summary Show Helm Chart Information
// @description
// @description **Access policy**: authenticated
// @tags helm
// @param repo query string true "Helm repository URL"
// @param chart query string true "Chart name"
// @param version query string true "Chart version"
// @param command path string true "chart/values/readme"
// @security ApiKeyAuth
// @security jwt
// @accept json
// @produce text/plain
// @success 200 {object} string "Success"
// @failure 401 "Unauthorized"
// @failure 404 "Environment(Endpoint) or ServiceAccount not found"
// @failure 500 "Server error"
// @router /templates/helm/{command} [get]
func (handler *Handler) helmShow(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
	repo := r.URL.Query().Get("repo")
	if repo == "" {
		return httperror.BadRequest("Bad request", errors.New("missing `repo` query parameter"))
	}
	_, err := url.ParseRequestURI(repo)
	if err != nil {
		return httperror.BadRequest("Bad request", errors.Wrap(err, fmt.Sprintf("provided URL %q is not valid", repo)))
	}

	chart := r.URL.Query().Get("chart")
	if chart == "" {
		return httperror.BadRequest("Bad request", errors.New("missing `chart` query parameter"))
	}

	version, err := request.RetrieveQueryParameter(r, "version", true)
	if err != nil {
		return httperror.BadRequest("Bad request", errors.Wrap(err, fmt.Sprintf("provided version %q is not valid", version)))
	}

	cmd, err := request.RetrieveRouteVariableValue(r, "command")
	if err != nil {
		cmd = "all"
		log.Debug().Str("default_command", cmd).Msg("command not provided, using default")
	}

	showOptions := options.ShowOptions{
		OutputFormat: options.ShowOutputFormat(cmd),
		Chart:        chart,
		Repo:         repo,
		Version:      version,
	}
	result, err := handler.helmPackageManager.Show(showOptions)
	if err != nil {
		return httperror.InternalServerError("Unable to show chart", err)
	}

	w.Header().Set("Content-Type", "text/plain")
	w.Write(result)

	return nil
}