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// Copyright 2019 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 discovery_v1
import (
"encoding/json"
"errors"
"strings"
"github.com/google/gnostic-models/compiler"
)
// APIsListServiceURL is the URL for the Google APIs Discovery Service
const APIsListServiceURL = "https://www.googleapis.com/discovery/v1/apis"
// A List represents the results of a call to the apis/list API.
// https://developers.google.com/discovery/v1/reference/apis/list
type List struct {
Kind string `json:"kind"`
DiscoveryVersion string `json:"discoveryVersion"`
APIs []*API `json:"items"`
}
func FetchListBytes() ([]byte, error) {
return compiler.FetchFile(APIsListServiceURL)
}
// Read the list of APIs from the apis/list service.
func FetchList() (*List, error) {
bytes, err := FetchListBytes()
if err != nil {
return nil, err
}
return ParseList(bytes)
}
// ParseList unmarshals the bytes into a Document.
func ParseList(bytes []byte) (*List, error) {
var listResponse List
err := json.Unmarshal(bytes, &listResponse)
return &listResponse, err
}
// An API represents an API description returned by the apis/list API.
type API struct {
Kind string `json:"kind"`
ID string `json:"id"`
Name string `json:"name"`
Version string `json:"version"`
Title string `json:"title"`
Description string `json:"description"`
DiscoveryRestURL string `json:"discoveryRestUrl"`
DiscoveryLink string `json:"discoveryLink"`
Icons map[string]string `json:"icons"`
DocumentationLink string `json:"documentationLink"`
Labels []string `json:"labels"`
Preferred bool `json:"preferred"`
}
// APIWithNameAndVersion returns the API with a specified name and version.
// If version is the empty string, the API name must be unique.
func (a *List) APIWithNameAndVersion(name string, version string) (*API, error) {
var api *API // the API to return
versions := make([]string, 0) // the matching version names
// Scan the list for matching APIs and versions.
for _, item := range a.APIs {
if item.Name == name {
if version == "" || version == item.Version {
api = item
versions = append(versions, item.Version)
}
}
}
switch {
case len(versions) == 0:
return nil, errors.New(name + " was not found.")
case len(versions) > 1:
return nil, errors.New(name + " has multiple versions: " + strings.Join(versions, ", "))
default:
return api, nil
}
}
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