Cherry pick v1.7 into master

vendor/github.com/xenolf/lego/providers/dns/httpreq/httpreq.go

@@ -0,0 +1,193 @@
+// Package httpreq implements a DNS provider for solving the DNS-01 challenge through a HTTP server.
+package httpreq
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/platform/config/env"
+)
+
+type message struct {
+	FQDN  string `json:"fqdn"`
+	Value string `json:"value"`
+}
+
+type messageRaw struct {
+	Domain  string `json:"domain"`
+	Token   string `json:"token"`
+	KeyAuth string `json:"keyAuth"`
+}
+
+// Config is used to configure the creation of the DNSProvider
+type Config struct {
+	Endpoint           *url.URL
+	Mode               string
+	Username           string
+	Password           string
+	PropagationTimeout time.Duration
+	PollingInterval    time.Duration
+	HTTPClient         *http.Client
+}
+
+// NewDefaultConfig returns a default configuration for the DNSProvider
+func NewDefaultConfig() *Config {
+	return &Config{
+		PropagationTimeout: env.GetOrDefaultSecond("HTTPREQ_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
+		PollingInterval:    env.GetOrDefaultSecond("HTTPREQ_POLLING_INTERVAL", acme.DefaultPollingInterval),
+		HTTPClient: &http.Client{
+			Timeout: env.GetOrDefaultSecond("HTTPREQ_HTTP_TIMEOUT", 30*time.Second),
+		},
+	}
+}
+
+// DNSProvider describes a provider for acme-proxy
+type DNSProvider struct {
+	config *Config
+}
+
+// NewDNSProvider returns a DNSProvider instance.
+func NewDNSProvider() (*DNSProvider, error) {
+	values, err := env.Get("HTTPREQ_ENDPOINT")
+	if err != nil {
+		return nil, fmt.Errorf("httpreq: %v", err)
+	}
+
+	endpoint, err := url.Parse(values["HTTPREQ_ENDPOINT"])
+	if err != nil {
+		return nil, fmt.Errorf("httpreq: %v", err)
+	}
+
+	config := NewDefaultConfig()
+	config.Mode = os.Getenv("HTTPREQ_MODE")
+	config.Username = os.Getenv("HTTPREQ_USERNAME")
+	config.Password = os.Getenv("HTTPREQ_PASSWORD")
+	config.Endpoint = endpoint
+	return NewDNSProviderConfig(config)
+}
+
+// NewDNSProviderConfig return a DNSProvider .
+func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
+	if config == nil {
+		return nil, errors.New("httpreq: the configuration of the DNS provider is nil")
+	}
+
+	if config.Endpoint == nil {
+		return nil, errors.New("httpreq: the endpoint is missing")
+	}
+
+	return &DNSProvider{config: config}, nil
+}
+
+// Timeout returns the timeout and interval to use when checking for DNS propagation.
+// Adjusting here to cope with spikes in propagation times.
+func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
+	return d.config.PropagationTimeout, d.config.PollingInterval
+}
+
+// Present creates a TXT record to fulfill the dns-01 challenge
+func (d *DNSProvider) Present(domain, token, keyAuth string) error {
+	if d.config.Mode == "RAW" {
+		msg := &messageRaw{
+			Domain:  domain,
+			Token:   token,
+			KeyAuth: keyAuth,
+		}
+
+		err := d.doPost("/present", msg)
+		if err != nil {
+			return fmt.Errorf("httpreq: %v", err)
+		}
+		return nil
+	}
+
+	fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
+	msg := &message{
+		FQDN:  fqdn,
+		Value: value,
+	}
+
+	err := d.doPost("/present", msg)
+	if err != nil {
+		return fmt.Errorf("httpreq: %v", err)
+	}
+	return nil
+}
+
+// CleanUp removes the TXT record matching the specified parameters
+func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
+	if d.config.Mode == "RAW" {
+		msg := &messageRaw{
+			Domain:  domain,
+			Token:   token,
+			KeyAuth: keyAuth,
+		}
+
+		err := d.doPost("/cleanup", msg)
+		if err != nil {
+			return fmt.Errorf("httpreq: %v", err)
+		}
+		return nil
+	}
+
+	fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
+	msg := &message{
+		FQDN:  fqdn,
+		Value: value,
+	}
+
+	err := d.doPost("/cleanup", msg)
+	if err != nil {
+		return fmt.Errorf("httpreq: %v", err)
+	}
+	return nil
+}
+
+func (d *DNSProvider) doPost(uri string, msg interface{}) error {
+	reqBody := &bytes.Buffer{}
+	err := json.NewEncoder(reqBody).Encode(msg)
+	if err != nil {
+		return err
+	}
+
+	endpoint, err := d.config.Endpoint.Parse(uri)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest(http.MethodPost, endpoint.String(), reqBody)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	if len(d.config.Username) > 0 && len(d.config.Password) > 0 {
+		req.SetBasicAuth(d.config.Username, d.config.Password)
+	}
+
+	resp, err := d.config.HTTPClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= http.StatusBadRequest {
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return fmt.Errorf("%d: failed to read response body: %v", resp.StatusCode, err)
+		}
+
+		return fmt.Errorf("%d: request failed: %v", resp.StatusCode, string(body))
+	}
+
+	return nil
+}