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Added cloud.id and cloud.auth config settings (elastic#4964)
* Added cloud.id and cloud.auth config settings This adds two new configuration settings: `cloud.id` and `cloud.auth`. They can be used in the configuration file, or from the CLI like this: ``` ./metricbeat -e -E cloud.id=<cloud-id> -E cloud.auth=<cloud-auth> ``` The ES/KB settings are changed via overwritting, but we display an INFO level message that the settings are changed by the cloud-id. Closes elastic#4959. * goimports fix * aded more tests * added basic docs * changelog * addressed comments * Check that we're not enabling a second output * remove unused var * Addressed comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // package cloudid contains functions for parsing the cloud.id and cloud.auth | ||
| // settings and modifying the configuration to take them into account. | ||
| package cloudid | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "fmt" | ||
| "net/url" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
|
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| "github.com/elastic/beats/libbeat/common" | ||
| "github.com/elastic/beats/libbeat/logp" | ||
| ) | ||
|
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||
| // OverwriteSettings modifies the received config object by overwriting the | ||
| // output.elasticsearch.hosts, output.elasticsearch.username, output.elasticsearch.password, | ||
| // setup.kibana.host settings based on values derived from the cloud.id and cloud.auth | ||
| // settings. | ||
| func OverwriteSettings(cfg *common.Config) error { | ||
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| cloudID, _ := cfg.String("cloud.id", -1) | ||
| cloudAuth, _ := cfg.String("cloud.auth", -1) | ||
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| if cloudID == "" && cloudAuth == "" { | ||
| // nothing to hack | ||
| return nil | ||
| } | ||
|
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| logp.Debug("cloudid", "cloud.id: %s, cloud.auth: %s", cloudID, cloudAuth) | ||
| if cloudID == "" { | ||
| return errors.New("cloud.auth specified but cloud.id is empty. Please specify both.") | ||
| } | ||
|
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||
| // cloudID overwrites | ||
| esURL, kibanaURL, err := decodeCloudID(cloudID) | ||
| if err != nil { | ||
| return errors.Errorf("Error decoding cloud.id: %v", err) | ||
| } | ||
|
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| logp.Info("Setting Elasticsearch and Kibana URLs based on the cloud id: output.elasticsearch.hosts=%s and setup.kibana.host=%s", esURL, kibanaURL) | ||
|
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| esURLConfig, err := common.NewConfigFrom([]string{esURL}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| // Before enabling the ES output, check that no other output is enabled | ||
| tmp := struct { | ||
| Output common.ConfigNamespace `config:"output"` | ||
| }{} | ||
| if err := cfg.Unpack(&tmp); err != nil { | ||
| return err | ||
| } | ||
| if out := tmp.Output; out.IsSet() && out.Name() != "elasticsearch" { | ||
| return errors.Errorf("The cloud.id setting enables the Elasticsearch output, but you already have the %s output enabled in the config", out.Name()) | ||
| } | ||
|
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| err = cfg.SetChild("output.elasticsearch.hosts", -1, esURLConfig) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| err = cfg.SetString("setup.kibana.host", -1, kibanaURL) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| if cloudAuth != "" { | ||
| // cloudAuth overwrites | ||
| username, password, err := decodeCloudAuth(cloudAuth) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| err = cfg.SetString("output.elasticsearch.username", -1, username) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| err = cfg.SetString("output.elasticsearch.password", -1, password) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| // decodeCloudID decodes the cloud.id into elasticsearch-URL and kibana-URL | ||
| func decodeCloudID(cloudID string) (string, string, error) { | ||
|
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| // 1. Ignore anything before `:`. | ||
| idx := strings.LastIndex(cloudID, ":") | ||
| if idx >= 0 { | ||
| cloudID = cloudID[idx+1:] | ||
| } | ||
|
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| // 2. base64 decode | ||
| decoded, err := base64.StdEncoding.DecodeString(cloudID) | ||
| if err != nil { | ||
| return "", "", errors.Wrapf(err, "base64 decoding failed on %s", cloudID) | ||
| } | ||
|
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| // 3. separate based on `$` | ||
| words := strings.Split(string(decoded), "$") | ||
| if len(words) < 3 { | ||
| return "", "", errors.Errorf("Expected at least 3 parts in %s", string(decoded)) | ||
| } | ||
|
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| // 4. form the URLs | ||
| esURL := url.URL{Scheme: "https", Host: fmt.Sprintf("%s.%s:443", words[1], words[0])} | ||
| kibanaURL := url.URL{Scheme: "https", Host: fmt.Sprintf("%s.%s:443", words[2], words[0])} | ||
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| return esURL.String(), kibanaURL.String(), nil | ||
| } | ||
|
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| // decodeCloudAuth splits the cloud.auth into username and password. | ||
| func decodeCloudAuth(cloudAuth string) (string, string, error) { | ||
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| idx := strings.Index(cloudAuth, ":") | ||
| if idx < 0 { | ||
| return "", "", errors.New("cloud.auth setting doesn't contain `:` to split between username and password") | ||
| } | ||
|
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| return cloudAuth[0:idx], cloudAuth[idx+1:], nil | ||
| } |
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