Add zero experimental tool

cmd/zero/DOCUMENTATION.md

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+# Zero
+
+Simple API management without a gateway. Instead of using a gateway, we will
+make direct calls to service control APIs from within our API server.
+
+Is this a good idea?
+
+Pros:
+
+- simple (no proxies to set up and manage)
+- inexpensive (no additional sidecars to operate)
+- runs anywhere (even when you run your server locally)
+
+Cons:
+
+- requires changes to your application
+- hard to govern, there may be uncontrolled APIs that leak information
+
+## Demonstration
+
+### Preparation
+
+#### You need a domain
+
+To register a service with service manager, a domain is required.
+
+##### Use a domain you control
+
+We can register a domain with a registrar and prove to Google that we own it,
+and then we can create services on that domain or any subdomain.
+“example1.timbx.me”
+
+##### Get a domain from App Engine
+
+Alternately, we can use Google App Engine to get a domain that we can use. App
+Engine apps are hosted at <appname>.appspot.com, where <appname> is usually the
+project id.
+
+- create an app engine app for your project
+- this will give you “appname.appspot.com”. For example, for my project, named
+  “nerdvana”, my domain name is “nerdvana.appspot.com”
+- we can use this for our service name.
+- we can also use subdomains of this domain.
+
+#### Create OAuth credentials
+
+These will be used to call the servicemanagement API
+
+store them in ~/.config/zero/credentials.json
+
+We could also use a service account for this.
+
+#### Set up the CLI
+
+create ~/.config/zero/zero.yaml for general configuration
+
+```
+serviceName: nerdvana.appspot.com
+serviceConfig: 2023-10-06r1
+apiKey: XXX-REDACTED-XXX
+producerProject: nerdvana
+consumerProject: nerdvana
+summary: "Namaste"
+title: "Nerdvana"
+```
+
+### Service Management
+
+#### Create your service
+
+Create your service with a call to the service management API
+
+View the service in the endpoints console
+
+#### Configure your service
+
+Create your service config -- notice that we want to specify some things:
+
+- name / version
+- description
+- operations
+
+#### Rollout your configuration
+
+Rollout your service config
+
+Verify the rollout in the endpoints console
+
+### Service Control
+
+Create a service account to call the servicecontrol API
+
+Call the check service
+
+Call the check/allocatequota/report methods
+
+### The Sample API
+
+TODO
+
+## Capabilities and Limitations
+
+TODO
+
+## Using the Service Management API to build an API Catalog
+
+Get a list of managed services and the configurations for each. Each
+configuration includes the list of operations that the API supports. These
+lists can be used to build an index of APIs being provided by your Google
+project.
+
+Not all APIs -- these are just the formally registered ones. Other indicators
+of APIs are Load Balancers, Cloud Run endpoints, and GKE ingresses.

cmd/zero/README.md

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+# zero
+
+This directory contains an experimental command-line tool that explores the
+[Google Service Infrastructure](https://cloud.google.com/service-infrastructure/docs/overview).
+
+This tool is temporarily named `zero` to indicate that this is a minimalist
+effort to explore the Service Infrastructure APIs out of the context of an API
+gateway.
+
+Areas to explore include:
+
+- Automatically creating managed services and manage service configurations for
+  APIs in an API registry.
+- Automatically importing information into an API registry from the
+  [Service Management API](https://cloud.google.com/service-infrastructure/docs/service-management/getting-started).
+- Directly calling the
+  [Service Control API](https://cloud.google.com/service-infrastructure/docs/service-control/getting-started)
+  as an alternative to using an API proxy for the most basic API management
+  needs.
+
+Custom components used by the tool are in the `pkg` directory. Implementations
+of CLI subcommands are in the `cmd` directory.
+
+Code is published for transparency and community review with no promises of
+support or continued existence.

cmd/zero/cmd/apikeys/cmd.go

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+// Copyright 2023 Google LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package apikeys
+
+import (
+	"github.com/apigee/registry-experimental/cmd/zero/cmd/apikeys/operations"
+	"github.com/spf13/cobra"
+)
+
+func Cmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "api-keys",
+		Short: "API key management",
+	}
+	cmd.AddCommand(createCmd())
+	cmd.AddCommand(deleteCmd())
+	cmd.AddCommand(getCmd())
+	cmd.AddCommand(getKeyStringCmd())
+	cmd.AddCommand(listCmd())
+	cmd.AddCommand(operations.Cmd())
+	return cmd
+}

cmd/zero/cmd/apikeys/create.go

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+// Copyright 2023 Google LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package apikeys
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/config"
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/patch"
+	"github.com/spf13/cobra"
+	"google.golang.org/api/apikeys/v2"
+	"google.golang.org/api/option"
+)
+
+func createCmd() *cobra.Command {
+	var output string
+	var producerProject string
+	cmd := &cobra.Command{
+		Use:  "create KEYID SERVICE",
+		Args: cobra.ExactArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+			client, err := config.GetClient(ctx)
+			if err != nil {
+				return err
+			}
+			apikey := &apikeys.V2Key{
+				Restrictions: &apikeys.V2Restrictions{
+					ApiTargets: []*apikeys.V2ApiTarget{
+						{Service: args[1]},
+					},
+				},
+			}
+			srv, err := apikeys.NewService(ctx, option.WithHTTPClient(client))
+			if err != nil {
+				return err
+			}
+			parent := fmt.Sprintf("projects/%s/locations/global", producerProject)
+			keyId := args[0]
+			item, err := apikeys.NewProjectsLocationsKeysService(srv).
+				Create(parent, apikey).
+				KeyId(keyId).
+				Do()
+			if err != nil {
+				return err
+			}
+			bytes, err := patch.MarshalAndWrap(item, "Operation", item.Name, output)
+			if err != nil {
+				return err
+			}
+			if _, err := cmd.OutOrStdout().Write(bytes); err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+	cmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format. One of: (yaml, json).")
+	cmd.Flags().StringVarP(&producerProject, "project", "p", "", "Producer project.")
+	return cmd
+}

cmd/zero/cmd/apikeys/delete.go

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+// Copyright 2023 Google LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package apikeys
+
+import (
+	"context"
+
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/config"
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/patch"
+	"google.golang.org/api/apikeys/v2"
+	"google.golang.org/api/option"
+
+	"github.com/spf13/cobra"
+)
+
+func deleteCmd() *cobra.Command {
+	var output string
+	cmd := &cobra.Command{
+		Use:  "delete APIKEY",
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+			client, err := config.GetClient(ctx)
+			if err != nil {
+				return err
+			}
+			apikey := args[0]
+			srv, err := apikeys.NewService(ctx, option.WithHTTPClient(client))
+			if err != nil {
+				return err
+			}
+			item, err := apikeys.NewProjectsLocationsKeysService(srv).
+				Delete(apikey).
+				Do()
+			if err != nil {
+				return err
+			}
+			bytes, err := patch.MarshalAndWrap(item, "Operation", item.Name, output)
+			if err != nil {
+				return err
+			}
+			if _, err := cmd.OutOrStdout().Write(bytes); err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+	cmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format. One of: (yaml, json).")
+	return cmd
+}

cmd/zero/cmd/apikeys/get.go

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+// Copyright 2023 Google LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package apikeys
+
+import (
+	"context"
+
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/config"
+	"github.com/apigee/registry-experimental/cmd/zero/pkg/patch"
+	"google.golang.org/api/apikeys/v2"
+	"google.golang.org/api/option"
+
+	"github.com/spf13/cobra"
+)
+
+func getCmd() *cobra.Command {
+	var output string
+	cmd := &cobra.Command{
+		Use:  "get APIKEY",
+		Args: cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+			client, err := config.GetClient(ctx)
+			if err != nil {
+				return err
+			}
+			apikey := args[0]
+			srv, err := apikeys.NewService(ctx, option.WithHTTPClient(client))
+			if err != nil {
+				return err
+			}
+			item, err := apikeys.NewProjectsLocationsKeysService(srv).
+				Get(apikey).
+				Do()
+			if err != nil {
+				return err
+			}
+			bytes, err := patch.MarshalAndWrap(item, "ApiKey", item.Name, output)
+			if err != nil {
+				return err
+			}
+			if _, err := cmd.OutOrStdout().Write(bytes); err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+	cmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format. One of: (yaml, json).")
+	return cmd
+}