secret & url {un,}marshaling

Signed-off-by: Owen Diehl <ow.diehl@gmail.com>

config/config.go

@@ -16,15 +16,20 @@
 
 package config
 
-import "path/filepath"
+import (
+	"encoding/json"
+	"path/filepath"
+)
+
+const secretToken = "<secret>"
 
 // Secret special type for storing secrets.
 type Secret string
 
 // MarshalYAML implements the yaml.Marshaler interface for Secrets.
 func (s Secret) MarshalYAML() (interface{}, error) {
 	if s != "" {
-		return "<secret>", nil
+		return secretToken, nil
 	}
 	return nil, nil
 }
@@ -35,6 +40,11 @@ func (s *Secret) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return unmarshal((*plain)(s))
 }
 
+// MarshalJSON implements the json.Marshaler interface for Secret.
+func (s Secret) MarshalJSON() ([]byte, error) {
+	return json.Marshal(secretToken)
+}
+
 // DirectorySetter is a config type that contains file paths that may
 // be relative to the file containing the config.
 type DirectorySetter interface {

config/config_test.go

@@ -0,0 +1,40 @@
+// Copyright 2021 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.
+
+// +build go1.8
+
+package config
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestJSONMarshalSecret(t *testing.T) {
+	test := struct {
+		S Secret
+	}{
+		S: Secret("test"),
+	}
+
+	c, err := json.Marshal(test)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// u003c -> "<"
+	// u003e -> ">"
+	require.Equal(t, "{\"S\":\"\\u003csecret\\u003e\"}", string(c), "Secret not properly elided.")
+}

config/http_config.go

@@ -21,6 +21,7 @@ import (
 	"crypto/sha256"
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net"
@@ -110,6 +111,28 @@ func (u URL) MarshalYAML() (interface{}, error) {
 	return nil, nil
 }
 
+// UnmarshalJSON implements the json.Marshaler interface for URL.
+func (u *URL) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+	urlp, err := url.Parse(s)
+	if err != nil {
+		return err
+	}
+	u.URL = urlp
+	return nil
+}
+
+// MarshalJSON implements the json.Marshaler interface for URL.
+func (u URL) MarshalJSON() ([]byte, error) {
+	if u.URL != nil {
+		return json.Marshal(u.URL.String())
+	}
+	return nil, nil
+}
+
 // OAuth2 is the oauth2 client configuration.
 type OAuth2 struct {
 	ClientID         string            `yaml:"client_id" json:"client_id"`
@@ -236,6 +259,16 @@ func (c *HTTPClientConfig) UnmarshalYAML(unmarshal func(interface{}) error) erro
 	return c.Validate()
 }
 
+// UnmarshalJSON implements the json.Marshaler interface for URL.
+func (c *HTTPClientConfig) UnmarshalJSON(data []byte) error {
+	type plain HTTPClientConfig
+	*c = DefaultHTTPClientConfig
+	if err := json.Unmarshal(data, (*plain)(c)); err != nil {
+		return err
+	}
+	return c.Validate()
+}
+
 // UnmarshalYAML implements the yaml.Unmarshaler interface.
 func (a *BasicAuth) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	type plain BasicAuth

config/http_config_test.go

@@ -26,6 +26,7 @@ import (
 	"net"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -36,6 +37,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
 	yaml "gopkg.in/yaml.v2"
 )
 
@@ -1276,3 +1278,40 @@ endpoint_params:
 		t.Fatalf("Expected authorization header to be 'Bearer 12345', got '%s'", authorization)
 	}
 }
+
+func TestMarshalURL(t *testing.T) {
+	urlp, err := url.Parse("http://example.com/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	u := &URL{urlp}
+
+	c, err := json.Marshal(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	require.Equal(t, "\"http://example.com/\"", string(c), "URL not properly marshaled in JSON.")
+
+	c, err = yaml.Marshal(u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	require.Equal(t, "http://example.com/\n", string(c), "URL not properly marshaled in YAML.")
+}
+
+func TestUnmarshalURL(t *testing.T) {
+	b := []byte(`"http://example.com/a b"`)
+	var u URL
+
+	err := json.Unmarshal(b, &u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	require.Equal(t, "http://example.com/a%20b", u.String(), "URL not properly unmarshaled in JSON.")
+
+	err = yaml.Unmarshal(b, &u)
+	if err != nil {
+		t.Fatal(err)
+	}
+	require.Equal(t, "http://example.com/a%20b", u.String(), "URL not properly unmarshaled in YAML.")
+}

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/prometheus/client_golang v1.7.1
 	github.com/prometheus/client_model v0.2.0
 	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.7.0
 	golang.org/x/net v0.0.0-20200625001655-4c5254603344
 	golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421
 	golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae

go.sum

@@ -261,8 +261,9 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
@@ -409,6 +410,8 @@ gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=