116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
// Copyright 2015 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 ec2
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import (
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"bufio"
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"bytes"
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"fmt"
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"log"
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"net"
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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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"github.com/coreos/coreos-cloudinit/pkg"
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)
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const (
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DefaultAddress = "http://169.254.169.254/"
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apiVersion = "2009-04-04/"
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userdataPath = apiVersion + "user-data"
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metadataPath = apiVersion + "meta-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)}
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}
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func (ms metadataService) FetchMetadata() (datasource.Metadata, error) {
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metadata := datasource.Metadata{}
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if keynames, err := ms.fetchAttributes(fmt.Sprintf("%s/public-keys", ms.MetadataUrl())); err == nil {
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keyIDs := make(map[string]string)
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for _, keyname := range keynames {
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tokens := strings.SplitN(keyname, "=", 2)
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if len(tokens) != 2 {
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return metadata, fmt.Errorf("malformed public key: %q", keyname)
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}
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keyIDs[tokens[1]] = tokens[0]
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}
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metadata.SSHPublicKeys = map[string]string{}
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for name, id := range keyIDs {
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sshkey, err := ms.fetchAttribute(fmt.Sprintf("%s/public-keys/%s/openssh-key", ms.MetadataUrl(), id))
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if err != nil {
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return metadata, err
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}
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metadata.SSHPublicKeys[name] = sshkey
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log.Printf("Found SSH key for %q\n", name)
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}
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if hostname, err := ms.fetchAttribute(fmt.Sprintf("%s/hostname", ms.MetadataUrl())); err == nil {
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metadata.Hostname = strings.Split(hostname, " ")[0]
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if localAddr, err := ms.fetchAttribute(fmt.Sprintf("%s/local-ipv4", ms.MetadataUrl())); err == nil {
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metadata.PrivateIPv4 = net.ParseIP(localAddr)
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if publicAddr, err := ms.fetchAttribute(fmt.Sprintf("%s/public-ipv4", ms.MetadataUrl())); err == nil {
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metadata.PublicIPv4 = net.ParseIP(publicAddr)
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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return metadata, nil
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}
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func (ms metadataService) Type() string {
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return "ec2-metadata-service"
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}
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func (ms metadataService) fetchAttributes(url string) ([]string, error) {
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resp, err := ms.FetchData(url)
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if err != nil {
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return nil, err
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}
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scanner := bufio.NewScanner(bytes.NewBuffer(resp))
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data := make([]string, 0)
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for scanner.Scan() {
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data = append(data, scanner.Text())
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}
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return data, scanner.Err()
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}
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func (ms metadataService) fetchAttribute(url string) (string, error) {
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if attrs, err := ms.fetchAttributes(url); err == nil && len(attrs) > 0 {
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return attrs[0], nil
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} else {
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return "", err
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}
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}
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