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requestor.go
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requestor.go
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package internal
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
"github.com/krateoplatformops/authn-lib/auth"
)
// Requester sends an HTTP request to query
// an authorization server to determine the active state of an
// access token and to determine meta-information about this token.
type Requester struct {
Addr string
Endpoint string
Method string
// Keep Unmarshalling body for all given types, by default stop after the first match
KeepUnmarshalling bool
Client *http.Client
// AdditionalData add more data to http request
AdditionalData func(r *http.Request)
Unmarshal func(data []byte, v any) error
Marshal func(v any) ([]byte, error)
}
// Do sends the HTTP request and parse the HTTP response.
func (r *Requester) Do(ctx context.Context, data, review, status any) (*http.Response, error) {
f := func(*http.Request) {}
return r.do(ctx, f, data, review, status)
}
// DoWithf same as Do but it accepts f to add additional information to the request.
func (r *Requester) DoWithf(ctx context.Context, f func(*http.Request), data, review, status any) (*http.Response, error) { //nolint:lll
return r.do(ctx, f, data, review, status)
}
func (r *Requester) do(ctx context.Context, f func(r *http.Request), data, review, status any) (*http.Response, error) { //nolint:lll
url := r.Addr + r.Endpoint
reader, err := r.reader(data)
if err != nil {
return nil, err
}
req, err := http.NewRequestWithContext(ctx, r.Method, url, reader)
if err != nil {
return nil, fmt.Errorf("Failed to create new HTTP request, Method: %s, URL: %s, Err: %w", r.Method, url, err)
}
f(req)
if r.AdditionalData != nil {
r.AdditionalData(req)
}
resp, err := r.Client.Do(req)
if err != nil {
return nil, fmt.Errorf("Failed to send the HTTP request, Method: POST, URL: %s, Err: %w", url, err)
}
if resp.Body == http.NoBody {
return resp, nil
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("Failed to read the HTTP response, Method: POST, URL: %s, Err: %w", url, err)
}
defer resp.Body.Close()
if err := r.Unmarshal(body, status); err == nil && !r.KeepUnmarshalling {
return resp, nil
}
if err := r.Unmarshal(body, review); err != nil {
return nil, fmt.Errorf("Failed to unmarshal response body data, Type: %T Err: %w", review, err)
}
return resp, nil
}
func (r *Requester) reader(data any) (io.Reader, error) {
if data == nil {
return http.NoBody, nil
}
body, err := r.Marshal(data)
if err != nil {
return nil, fmt.Errorf("Failed to marshal request body data, Type: %T, Err: %w", data, err)
}
return bytes.NewBuffer(body), nil
}
// SetHeader for all outgoing request's.
func (r *Requester) SetHeader(key, value string) {
additionalData := r.AdditionalData
r.AdditionalData = func(r *http.Request) {
r.Header.Set(key, value)
if additionalData != nil {
additionalData(r)
}
}
}
// NewRequester returns new requester instance.
func NewRequester(addr string) *Requester {
r := new(Requester)
r.Method = http.MethodPost
r.Addr = addr
r.Endpoint = ""
r.Marshal = json.Marshal
r.Unmarshal = json.Unmarshal
r.Client = &http.Client{
Transport: &http.Transport{},
}
return r
}
// ----------------------------------------------------------------------------
// Auth Options
// ----------------------------------------------------------------------------
// SetRequesterMethod sets ruqester http method.
func SetRequesterMethod(method string) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Method = method
}
})
}
// SetRequesterBearerToken sets ruqester token.
func SetRequesterBearerToken(token string) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.SetHeader("Authorization", "Bearer "+token)
}
})
}
// SetRequesterBasicAuth sets ruqester basic auth.
func SetRequesterBasicAuth(username, password string) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
additionalData := r.AdditionalData
r.AdditionalData = func(r *http.Request) {
r.SetBasicAuth(username, password)
if additionalData != nil {
additionalData(r)
}
}
}
})
}
// SetRequesterHTTPClient sets underlying requester http client.
func SetRequesterHTTPClient(c *http.Client) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Client = c
}
})
}
// SetRequesterTLSConfig sets underlying requester http client tls config.
func SetRequesterTLSConfig(tls *tls.Config) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Client.Transport.(*http.Transport).TLSClientConfig = tls
}
})
}
// SetRequesterClientTransport sets underlying requester http client transport.
func SetRequesterClientTransport(rt http.RoundTripper) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Client.Transport = rt
}
})
}
// SetRequesterAddress sets requester origin server address
// e.g http://host:port or https://host:port.
func SetRequesterAddress(addr string) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Addr = strings.TrimSuffix(addr, "/")
}
})
}
// SetRequesterEndpoint sets requester origin server endpoint.
// e.g /api/v1/token
func SetRequesterEndpoint(endpoint string) auth.Option {
return auth.OptionFunc(func(v any) {
if r, ok := v.(*Requester); ok {
r.Addr = "/" + strings.TrimSuffix(endpoint, "/")
}
})
}