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131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gce
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import (
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"fmt"
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"net"
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"net/http"
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"strconv"
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"strings"
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"github.com/coreos/coreos-cloudinit/datasource"
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"github.com/coreos/coreos-cloudinit/datasource/metadata"
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)
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const (
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apiVersion = "computeMetadata/v1/"
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metadataPath = apiVersion
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userdataPath = apiVersion + "instance/attributes/user-data"
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)
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type metadataService struct {
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metadata.MetadataService
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}
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func NewDatasource(root string) *metadataService {
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return &metadataService{metadata.NewDatasource(root, apiVersion, userdataPath, metadataPath, http.Header{"Metadata-Flavor": {"Google"}})}
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}
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func (ms metadataService) FetchMetadata() (datasource.Metadata, error) {
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public, err := ms.fetchIP("instance/network-interfaces/0/access-configs/0/external-ip")
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if err != nil {
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return datasource.Metadata{}, err
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}
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local, err := ms.fetchIP("instance/network-interfaces/0/ip")
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if err != nil {
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return datasource.Metadata{}, err
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}
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hostname, err := ms.fetchString("instance/hostname")
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if err != nil {
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return datasource.Metadata{}, err
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}
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projectSshKeys, err := ms.fetchString("project/attributes/sshKeys")
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if err != nil {
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return datasource.Metadata{}, err
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}
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instanceSshKeys, err := ms.fetchString("instance/attributes/sshKeys")
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if err != nil {
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return datasource.Metadata{}, err
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}
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keyStrings := strings.Split(projectSshKeys+"\n"+instanceSshKeys, "\n")
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sshPublicKeys := map[string]string{}
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i := 0
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for _, keyString := range keyStrings {
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keySlice := strings.SplitN(keyString, ":", 2)
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if len(keySlice) == 2 {
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key := strings.TrimSpace(keySlice[1])
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if key != "" {
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sshPublicKeys[strconv.Itoa(i)] = strings.TrimSpace(keySlice[1])
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i++
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}
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}
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}
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return datasource.Metadata{
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PublicIPv4: public,
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PrivateIPv4: local,
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Hostname: hostname,
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SSHPublicKeys: sshPublicKeys,
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}, nil
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}
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func (ms metadataService) Type() string {
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return "gce-metadata-service"
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}
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func (ms metadataService) fetchString(key string) (string, error) {
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data, err := ms.FetchData(ms.MetadataUrl() + key)
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if err != nil {
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return "", err
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}
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return string(data), nil
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}
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func (ms metadataService) fetchIP(key string) (net.IP, error) {
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str, err := ms.fetchString(key)
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if err != nil {
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return nil, err
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}
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if str == "" {
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return nil, nil
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}
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if ip := net.ParseIP(str); ip != nil {
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return ip, nil
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} else {
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return nil, fmt.Errorf("couldn't parse %q as IP address", str)
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}
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}
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func (ms metadataService) FetchUserdata() ([]byte, error) {
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data, err := ms.FetchData(ms.UserdataUrl())
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if err != nil {
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return nil, err
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}
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if len(data) == 0 {
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data, err = ms.FetchData(ms.MetadataUrl() + "instance/attributes/startup-script")
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if err != nil {
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return nil, err
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}
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}
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return data, nil
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}
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