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token_mock.go
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token_mock.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package test
import (
"bytes"
"fmt"
"github.com/hashicorp/go-azure-sdk/sdk/environments"
"io"
"net/http"
"net/url"
"regexp"
)
const (
uuidRegex = "[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}"
)
type AzureADAccessTokenMockClient struct {
Authorization environments.Authorization
}
func (c *AzureADAccessTokenMockClient) Do(r *http.Request) (resp *http.Response, err error) {
if r == nil {
return nil, fmt.Errorf("request was nil")
}
resp = &http.Response{
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
StatusCode: http.StatusOK,
Header: http.Header{
"Content-Type": []string{"application/json; charset=utf-8"},
},
Request: r,
}
if err = resp.Request.ParseForm(); err != nil {
return nil, err
}
u, err := url.Parse(c.Authorization.LoginEndpoint)
if err != nil {
return nil, err
}
loginHost := u.Host
if p := u.Port(); p != "" {
loginHost = fmt.Sprintf("%s:%s", loginHost, p)
}
metadataHost := "169.254.169.254"
switch r.Host {
case loginHost:
return c.tokenFromLoginEndpoint(resp)
case metadataHost:
return c.tokenFromInstanceMetadataService(resp)
}
return nil, fmt.Errorf("unexpected Host header, expected %q, received %q", u.Host, loginHost)
}
func (c *AzureADAccessTokenMockClient) tokenFromLoginEndpoint(resp *http.Response) (*http.Response, error) {
if resp.Request.Method != http.MethodPost {
return nil, fmt.Errorf("unexpected request method, should be POST, received %s", resp.Request.Method)
}
pathRegex := fmt.Sprintf(`^\/(%s)(\/oauth2\/v2.0\/token)$`, uuidRegex)
if m := regexp.MustCompile(pathRegex).FindStringSubmatch(resp.Request.URL.Path); len(m) != 3 {
return nil, fmt.Errorf("URL path did not match pattern %q: %q", pathRegex, resp.Request.URL.Path)
}
clientId := resp.Request.PostForm.Get("client_id")
if clientId == "" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing 'client_id' field"}`))
return resp, nil
}
scope := resp.Request.PostForm.Get("scope")
if scope == "" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing 'scope' field"}`))
return resp, nil
}
grantType := resp.Request.PostForm.Get("grant_type")
switch grantType {
case "client_credentials":
if clientSecret := resp.Request.PostForm.Get("client_secret"); clientSecret != "" {
return c.token(resp)
}
if clientAssertion := resp.Request.PostForm.Get("client_assertion"); clientAssertion != "" {
switch clientAssertionType := resp.Request.PostForm.Get("client_assertion_type"); clientAssertionType {
case "urn:ietf:params:oauth:client-assertion-type:jwt-bearer":
return c.token(resp)
}
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"unrecognised value for 'client_assertion_type' field"}`))
return resp, nil
}
default:
return nil, fmt.Errorf("grant type %q is not supported", grantType)
}
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"unsupported or unrecognised authentication parameters"}`))
return resp, nil
}
func (c *AzureADAccessTokenMockClient) tokenFromInstanceMetadataService(resp *http.Response) (*http.Response, error) {
if resp.Request.Method != http.MethodGet {
return nil, fmt.Errorf("unexpected request method, should be GET, received %s", resp.Request.Method)
}
if expected := "/metadata/identity/oauth2/token"; resp.Request.URL.Path != expected {
return nil, fmt.Errorf("unexpected URL path, expected %q, received %q", expected, resp.Request.URL.Path)
}
if resp.Request.Header.Get("Metadata") != "true" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing or invalid 'Metadata' header"}`))
return resp, nil
}
apiVersion := resp.Request.Form.Get("api-version")
if apiVersion == "" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing 'api-version' field"}`))
return resp, nil
}
clientId := resp.Request.Form.Get("client_id")
if clientId == "" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing 'client_id' field"}`))
return resp, nil
}
resource := resp.Request.Form.Get("resource")
if resource == "" {
resp.StatusCode = http.StatusBadRequest
resp.Body = io.NopCloser(bytes.NewBufferString(`{"error":"missing 'resource' field"}`))
return resp, nil
}
body := fmt.Sprintf(`{"access_token":"%s","client_id":"%s","expires_in":"86391","expires_on":"1611701390","ext_expires_in":"86399","not_before":"1611614690","resource":"%s","token_type":"Bearer"}`,
DummyAccessToken, clientId, resource)
resp.Body = io.NopCloser(bytes.NewBufferString(body))
return resp, nil
}
func (c *AzureADAccessTokenMockClient) token(resp *http.Response) (*http.Response, error) {
resp.Body = io.NopCloser(bytes.NewBufferString(fmt.Sprintf(`{"token_type":"Bearer","expires_in":3599,"ext_expires_in":3599,"access_token":"%s"}`, DummyAccessToken)))
return resp, nil
}