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transport: add ValidateSecureEndpoints
goes through all endpoints checking if they abide by given tls info
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Anthony Romano
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Aug 3, 2016
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// Copyright 2016 The etcd Authors | ||
// | ||
// 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. | ||
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package transport | ||
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import ( | ||
"fmt" | ||
"strings" | ||
"time" | ||
) | ||
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// ValidateSecureEndpoints scans the given endpoints against tls info, returning only those | ||
// endpoints that could be validated as secure. | ||
func ValidateSecureEndpoints(tlsInfo TLSInfo, eps []string) ([]string, error) { | ||
t, err := NewTransport(tlsInfo, 5*time.Second) | ||
if err != nil { | ||
return nil, err | ||
} | ||
var errs []string | ||
var endpoints []string | ||
for _, ep := range eps { | ||
if !strings.HasPrefix(ep, "https://") { | ||
errs = append(errs, fmt.Sprintf("%q is insecure", ep)) | ||
continue | ||
} | ||
conn, cerr := t.Dial("tcp", ep[len("https://"):]) | ||
if cerr != nil { | ||
errs = append(errs, fmt.Sprintf("%q failed to dial (%v)", ep, cerr)) | ||
continue | ||
} | ||
conn.Close() | ||
endpoints = append(endpoints, ep) | ||
} | ||
if len(errs) != 0 { | ||
err = fmt.Errorf("%s", strings.Join(errs, ",")) | ||
} | ||
return endpoints, err | ||
} |