Vendoring with Glide and delete function handler

gateway/vendor/github.com/prometheus/common/config/tls_config.go

@@ -0,0 +1,79 @@
+// Copyright 2016 The Prometheus 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.
+
+package config
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+)
+
+// TLSConfig configures the options for TLS connections.
+type TLSConfig struct {
+	// The CA cert to use for the targets.
+	CAFile string `yaml:"ca_file,omitempty"`
+	// The client cert file for the targets.
+	CertFile string `yaml:"cert_file,omitempty"`
+	// The client key file for the targets.
+	KeyFile string `yaml:"key_file,omitempty"`
+	// Disable target certificate validation.
+	InsecureSkipVerify bool `yaml:"insecure_skip_verify"`
+
+	// Catches all undefined fields and must be empty after parsing.
+	XXX map[string]interface{} `yaml:",inline"`
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *TLSConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type plain TLSConfig
+	if err := unmarshal((*plain)(c)); err != nil {
+		return err
+	}
+	return checkOverflow(c.XXX, "TLS config")
+}
+
+// GenerateConfig produces a tls.Config based on TLS connection options.
+// It loads certificate files from disk if they are defined.
+func (c *TLSConfig) GenerateConfig() (*tls.Config, error) {
+	tlsConfig := &tls.Config{InsecureSkipVerify: c.InsecureSkipVerify}
+
+	// If a CA cert is provided then let's read it in so we can validate the
+	// scrape target's certificate properly.
+	if len(c.CAFile) > 0 {
+		caCertPool := x509.NewCertPool()
+		// Load CA cert.
+		caCert, err := ioutil.ReadFile(c.CAFile)
+		if err != nil {
+			return nil, fmt.Errorf("unable to use specified CA cert %s: %s", c.CAFile, err)
+		}
+		caCertPool.AppendCertsFromPEM(caCert)
+		tlsConfig.RootCAs = caCertPool
+	}
+
+	if len(c.CertFile) > 0 && len(c.KeyFile) == 0 {
+		return nil, fmt.Errorf("client cert file %q specified without client key file", c.CertFile)
+	} else if len(c.KeyFile) > 0 && len(c.CertFile) == 0 {
+		return nil, fmt.Errorf("client key file %q specified without client cert file", c.KeyFile)
+	} else if len(c.CertFile) > 0 && len(c.KeyFile) > 0 {
+		cert, err := tls.LoadX509KeyPair(c.CertFile, c.KeyFile)
+		if err != nil {
+			return nil, fmt.Errorf("unable to use specified client cert (%s) & key (%s): %s", c.CertFile, c.KeyFile, err)
+		}
+		tlsConfig.Certificates = []tls.Certificate{cert}
+	}
+	tlsConfig.BuildNameToCertificate()
+
+	return tlsConfig, nil
+}