Add before send option

api/admin/api.go

@@ -198,6 +198,9 @@ func (a *API) executeRequest(ctx context.Context, method string, path interface{
 
 	req = req.WithContext(ctx)
 
+	if a.Config.API.BeforeSend != nil {
+		a.Config.API.BeforeSend(req)
+	}
 	resp, err := a.Client.Do(req)
 	if err != nil {
 		return nil, err

api/admin/api_acceptance_test.go

@@ -5,12 +5,14 @@ package admin_test
 import (
 	"context"
 	"fmt"
+	"net/http"
+	"reflect"
+	"testing"
+
 	"github.com/cloudinary/cloudinary-go/v2/api"
 	"github.com/cloudinary/cloudinary-go/v2/api/admin"
 	"github.com/cloudinary/cloudinary-go/v2/config"
 	"github.com/cloudinary/cloudinary-go/v2/internal/cldtest"
-	"reflect"
-	"testing"
 )
 
 var oAuthTokenConfig, _ = config.NewFromOAuthToken(cldtest.CloudName, "MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
@@ -148,10 +150,34 @@ func getAuthorizationTestCases() []AdminAPIAcceptanceTestCase {
 	}
 }
 
+// Acceptance test cases for before send
+func getBeforeSendTestCases() []AdminAPIAcceptanceTestCase {
+	return []AdminAPIAcceptanceTestCase{
+		{
+			Name: "Ping Test Before Send",
+			RequestTest: func(api *admin.API, ctx context.Context) (interface{}, error) {
+				api.Config.API.BeforeSend = func(req *http.Request) {
+					req.Header.Set("X-Test-Header", "test")
+				}
+				return api.Ping(ctx)
+			},
+			ResponseTest: func(response interface{}, t *testing.T) {},
+			ExpectedRequest: cldtest.ExpectedRequestParams{
+				Method:  "GET",
+				URI:     "/ping",
+				Headers: &map[string]string{"X-Test-Header": "test"},
+			},
+			JsonResponse:      "{\"status\": \"OK\"}",
+			ExpectedCallCount: 1,
+		},
+	}
+}
+
 // Run tests
 func TestAdminAPI_Acceptance(t *testing.T) {
 	t.Parallel()
 	testAdminAPIByTestCases(getPingTestCases(), t)
 	testAdminAPIByTestCases(getUserAgentTestCases(), t)
 	testAdminAPIByTestCases(getAuthorizationTestCases(), t)
+	testAdminAPIByTestCases(getBeforeSendTestCases(), t)
 }

api/uploader/upload.go

@@ -350,6 +350,9 @@ func (u *API) postBody(ctx context.Context, urlPath interface{}, bodyReader io.R
 
 	req = req.WithContext(ctx)
 
+	if u.Config.API.BeforeSend != nil {
+		u.Config.API.BeforeSend(req)
+	}
 	resp, err := u.Client.Do(req)
 	if err != nil {
 		return nil, err

api/uploader/upload_acceptance_test.go

@@ -5,12 +5,14 @@ package uploader_test
 import (
 	"context"
 	"fmt"
+	"net/http"
+	"testing"
+
 	"github.com/cloudinary/cloudinary-go/v2/api"
 	"github.com/cloudinary/cloudinary-go/v2/api/uploader"
 	"github.com/cloudinary/cloudinary-go/v2/config"
 	"github.com/cloudinary/cloudinary-go/v2/internal/cldtest"
 	"github.com/cloudinary/cloudinary-go/v2/internal/signature"
-	"testing"
 )
 
 var oAuthTokenConfig, _ = config.NewFromOAuthToken(cldtest.CloudName, "MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
@@ -186,6 +188,35 @@ func getUploadConfigTestCases() []UploadAPIAcceptanceTestCase {
 	}
 }
 
+// Acceptance test cases for before send
+func getBeforeSendTestCases() []UploadAPIAcceptanceTestCase {
+	body := "file=data%3Aimage%2Fgif%3Bbase64%2CR0lGODlhAQABAIAAAAAAAP%2F%2F%2FyH5BAEAAAAALAAAAAABAAEAAAIBRAA7" +
+		"&timestamp=123456789&unsigned=true"
+
+	return []UploadAPIAcceptanceTestCase{
+		{
+			Name: "Upload Test Before Send",
+			RequestTest: func(uploadAPI *uploader.API, ctx context.Context) (interface{}, error) {
+				uploadAPI.Config.API.BeforeSend = func(req *http.Request) {
+					req.Header.Set("X-Test-Header", "test")
+				}
+				return uploadAPI.Upload(ctx, cldtest.Base64Image, uploader.UploadParams{
+					Timestamp: 123456789,
+					Unsigned:  api.Bool(true),
+				})
+			},
+			ResponseTest: func(response interface{}, t *testing.T) {},
+			ExpectedRequest: cldtest.ExpectedRequestParams{
+				Method:  "POST",
+				URI:     "/auto/upload",
+				Body:    &body,
+				Headers: &map[string]string{"X-Test-Header": "test"},
+			},
+			ExpectedCallCount: 1,
+		},
+	}
+}
+
 // Run tests
 func TestUploadAPI_Acceptance(t *testing.T) {
 	t.Parallel()
@@ -195,4 +226,5 @@ func TestUploadAPI_Acceptance(t *testing.T) {
 	testUploadAPIByTestCases(getBooleanValuesTestCases(), t)
 	testUploadAPIByTestCases(getVariousValuesTestCases(), t)
 	testUploadAPIByTestCases(getUploadConfigTestCases(), t)
+	testUploadAPIByTestCases(getBeforeSendTestCases(), t)
 }

config/api.go

@@ -1,9 +1,12 @@
 package config
 
+import "net/http"
+
 // API defines the configuration for making requests to the Cloudinary API.
 type API struct {
 	UploadPrefix  string `schema:"upload_prefix" default:"https://api.cloudinary.com"`
 	Timeout       int64  `schema:"timeout" default:"60"` // seconds
 	UploadTimeout int64  `schema:"upload_timeout"`
 	ChunkSize     int64  `schema:"chunk_size" default:"20000000"` // bytes
+	BeforeSend    func(req *http.Request)
 }