telebit/internal/http01/http01.go

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package http01
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path"
"time"
"github.com/mholt/acmez/acme"
)
// Config is used to configure the creation of the HTTP-01 Solver.
type Config struct {
Endpoint *url.URL
Token string
HTTPClient *http.Client
}
// Solver implements the challenge.Provider interface.
type Solver struct {
config *Config
}
// Challenge is an ACME http-01 challenge
type Challenge struct {
Type string `json:"type"`
Token string `json:"token"`
KeyAuthorization string `json:"key_authorization"`
Identifier Identifier `json:"identifier"`
}
// Identifier is restricted to DNS Domain Names for now
type Identifier struct {
Type string `json:"type"`
Value string `json:"value"`
}
// NewSolver return a new HTTP-01 Solver.
func NewSolver(config *Config) (*Solver, error) {
if config == nil {
return nil, errors.New("api: the configuration of the DNS provider is nil")
}
if config.Endpoint == nil {
return nil, errors.New("api: the endpoint is missing")
}
if nil == config.HTTPClient {
config.HTTPClient = &http.Client{
Timeout: 5 * time.Second,
}
}
return &Solver{config: config}, nil
}
// Present creates a DNS-01 Challenge Token
func (s *Solver) Present(ctx context.Context, ch acme.Challenge) error {
msg := &Challenge{
Type: "http-01",
Token: ch.Token,
KeyAuthorization: ch.KeyAuthorization,
Identifier: Identifier{
Type: ch.Identifier.Type,
Value: ch.Identifier.Value,
},
}
err := s.doRequest(http.MethodPost, fmt.Sprintf("/%s", msg.Identifier.Value), msg)
if err != nil {
return fmt.Errorf("api: %w", err)
}
return nil
}
// CleanUp deletes an HTTP-01 Challenge Token
func (s *Solver) CleanUp(ctx context.Context, ch acme.Challenge) error {
msg := &Challenge{
Type: "http-01",
Token: ch.Token,
KeyAuthorization: ch.KeyAuthorization,
Identifier: Identifier{
Type: ch.Identifier.Type,
Value: ch.Identifier.Value,
},
}
err := s.doRequest(
http.MethodDelete,
fmt.Sprintf("/%s/%s/%s/%s", msg.Identifier.Value, msg.Token, msg.KeyAuthorization, msg.Type),
nil,
)
if err != nil {
return fmt.Errorf("api: %w", err)
}
return nil
}
func (s *Solver) doRequest(method, uri string, msg interface{}) error {
data, _ := json.MarshalIndent(msg, "", " ")
reqBody := bytes.NewBuffer(data)
newURI := path.Join(s.config.Endpoint.EscapedPath(), uri)
endpoint, err := s.config.Endpoint.Parse(newURI)
if err != nil {
return err
}
req, err := http.NewRequest(method, endpoint.String(), reqBody)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
if len(s.config.Token) > 0 {
req.Header.Set("Authorization", "Bearer "+s.config.Token)
}
resp, err := s.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: %w", resp.StatusCode, err)
}
return fmt.Errorf("%d: request failed: %v", resp.StatusCode, string(body))
}
return nil
}