porter/api/server/handlers/porter_app/get.go

package porter_app

import (
	"fmt"
	"net/http"

	"github.com/porter-dev/porter/api/server/authz"
	"github.com/porter-dev/porter/api/server/handlers"
	"github.com/porter-dev/porter/api/server/shared"
	"github.com/porter-dev/porter/api/server/shared/apierrors"
	"github.com/porter-dev/porter/api/server/shared/config"
	"github.com/porter-dev/porter/api/server/shared/requestutils"
	"github.com/porter-dev/porter/api/types"
	"github.com/porter-dev/porter/internal/models"
	"github.com/porter-dev/porter/internal/telemetry"
)

type GetPorterAppHandler struct {
	handlers.PorterHandlerReadWriter
	authz.KubernetesAgentGetter
}

func NewGetPorterAppHandler(
	config *config.Config,
	writer shared.ResultWriter,
) *GetPorterAppHandler {
	return &GetPorterAppHandler{
		PorterHandlerReadWriter: handlers.NewDefaultPorterHandler(config, nil, writer),
		KubernetesAgentGetter:   authz.NewOutOfClusterAgentGetter(config),
	}
}

// ServeHTTP handles the get porter app API endpoint
//
// NOTE: This endpoint is still in use as of 2024-04-15.
func (c *GetPorterAppHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	ctx, span := telemetry.NewSpan(ctx, "serve-get-porter-app")
	defer span.End()

	cluster, _ := ctx.Value(types.ClusterScope).(*models.Cluster)

	appName, reqErr := requestutils.GetURLParamString(r, types.URLParamPorterAppName)
	if reqErr != nil {
		err := telemetry.Error(ctx, span, nil, "error parsing porter app name")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusBadRequest))
		return
	}
	telemetry.WithAttributes(span, telemetry.AttributeKV{Key: "application-name", Value: appName})

	app, err := c.Repo().PorterApp().ReadPorterAppByName(cluster.ID, appName)
	if err != nil {
		err = telemetry.Error(ctx, span, err, "error reading porter app by name")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}
	if app == nil || app.ID == 0 {
		err = telemetry.Error(ctx, span, nil, "app with name does not exist in project")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusBadRequest))
		return
	}

	namespace := fmt.Sprintf("app-%s", app.Name)
	helmAgent, err := c.GetHelmAgent(ctx, r, cluster, namespace)
	if err != nil {
		err = telemetry.Error(ctx, span, err, "error getting helm agent")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}
	helmRelease, err := helmAgent.GetRelease(ctx, appName, 0, false)
	if err != nil {
		err = telemetry.Error(ctx, span, err, "error getting helm release for app")
		c.HandleAPIError(w, r, apierrors.NewErrPassThroughToClient(err, http.StatusInternalServerError))
		return
	}

	c.WriteResult(w, r, app.ToPorterAppTypeWithRevision(helmRelease.Version))
}