Allow custom http.Client in credential providers.

pkg/credentials/assume_role.go

@@ -76,6 +76,10 @@ type AssumeRoleResult struct {
 type STSAssumeRole struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// STS endpoint to fetch STS credentials.
 	STSEndpoint string
 
@@ -219,7 +223,11 @@ func getAssumeRoleCredentials(clnt *http.Client, endpoint string, opts STSAssume
 // Retrieve retrieves credentials from the MinIO service.
 // Error will be returned if the request fails.
 func (m *STSAssumeRole) Retrieve(cc *CredContext) (Value, error) {
-	a, err := getAssumeRoleCredentials(cc.Client, m.STSEndpoint, m.Options)
+	client := m.Client
+	if client == nil {
+		client = cc.Client
+	}
+	a, err := getAssumeRoleCredentials(client, m.STSEndpoint, m.Options)
 	if err != nil {
 		return Value{}, err
 	}

pkg/credentials/iam_aws.go

@@ -49,6 +49,10 @@ const DefaultExpiryWindow = -1
 type IAM struct {
 	Expiry
 
+	// Optional http Client to use when connecting to IAM metadata service
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// Custom endpoint to fetch IAM role credentials.
 	Endpoint string
 
@@ -154,6 +158,7 @@ func (m *IAM) Retrieve(cc *CredContext) (Value, error) {
 		}
 
 		creds := &STSWebIdentity{
+			Client:      m.Client,
 			STSEndpoint: endpoint,
 			GetWebIDTokenExpiry: func() (*WebIdentityToken, error) {
 				token, err := os.ReadFile(identityFile)

pkg/credentials/sts_client_grants.go

@@ -72,6 +72,10 @@ type ClientGrantsToken struct {
 type STSClientGrants struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service.
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// MinIO endpoint to fetch STS credentials.
 	STSEndpoint string
 
@@ -159,7 +163,11 @@ func getClientGrantsCredentials(clnt *http.Client, endpoint string,
 // Retrieve retrieves credentials from the MinIO service.
 // Error will be returned if the request fails.
 func (m *STSClientGrants) Retrieve(cc *CredContext) (Value, error) {
-	a, err := getClientGrantsCredentials(cc.Client, m.STSEndpoint, m.GetClientGrantsTokenExpiry)
+	client := m.Client
+	if client == nil {
+		client = cc.Client
+	}
+	a, err := getClientGrantsCredentials(client, m.STSEndpoint, m.GetClientGrantsTokenExpiry)
 	if err != nil {
 		return Value{}, err
 	}

pkg/credentials/sts_custom_identity.go

@@ -53,6 +53,10 @@ type AssumeRoleWithCustomTokenResponse struct {
 type CustomTokenIdentity struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service.
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// MinIO server STS endpoint to fetch STS credentials.
 	STSEndpoint string
 
@@ -90,7 +94,12 @@ func (c *CustomTokenIdentity) Retrieve(cc *CredContext) (value Value, err error)
 		return value, err
 	}
 
-	resp, err := cc.Client.Do(req)
+	client := c.Client
+	if client == nil {
+		client = cc.Client
+	}
+
+	resp, err := client.Do(req)
 	if err != nil {
 		return value, err
 	}

pkg/credentials/sts_ldap_identity.go

@@ -55,6 +55,10 @@ type LDAPIdentityResult struct {
 type LDAPIdentity struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service.
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// Exported STS endpoint to fetch STS credentials.
 	STSEndpoint string
 
@@ -143,7 +147,12 @@ func (k *LDAPIdentity) Retrieve(cc *CredContext) (value Value, err error) {
 
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
-	resp, err := cc.Client.Do(req)
+	client := k.Client
+	if client == nil {
+		client = cc.Client
+	}
+
+	resp, err := client.Do(req)
 	if err != nil {
 		return value, err
 	}

pkg/credentials/sts_tls_identity.go

@@ -33,6 +33,12 @@ import (
 // livetime.
 type CertificateIdentityOption func(*STSCertificateIdentity)
 
+// CertificateIdentityWithTransport returns a CertificateIdentityOption that
+// customizes the STSCertificateIdentity with the given http.RoundTripper.
+func CertificateIdentityWithTransport(t http.RoundTripper) CertificateIdentityOption {
+	return CertificateIdentityOption(func(i *STSCertificateIdentity) { i.Client.Transport = t })
+}
+
 // CertificateIdentityWithExpiry returns a CertificateIdentityOption that
 // customizes the STSCertificateIdentity with the given livetime.
 //
@@ -47,6 +53,10 @@ func CertificateIdentityWithExpiry(livetime time.Duration) CertificateIdentityOp
 type STSCertificateIdentity struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service.
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// STSEndpoint is the base URL endpoint of the STS API.
 	// For example, https://minio.local:9000
 	STSEndpoint string
@@ -115,16 +125,24 @@ func (i *STSCertificateIdentity) Retrieve(cc *CredContext) (Value, error) {
 	}
 	req.Form.Add("DurationSeconds", strconv.FormatUint(uint64(livetime.Seconds()), 10))
 
-	tr, ok := cc.Client.Transport.(*http.Transport)
+	client := i.Client
+	if client == nil {
+		client = cc.Client
+	}
+
+	tr, ok := client.Transport.(*http.Transport)
 	if !ok {
 		return Value{}, fmt.Errorf("CredContext should contain an http.Transport value")
 	}
 
 	trCopy := tr.Clone()
 	trCopy.TLSClientConfig.Certificates = []tls.Certificate{i.Certificate}
 
-	client := http.Client{
-		Transport: trCopy,
+	client = &http.Client{
+		Transport:     trCopy,
+		CheckRedirect: client.CheckRedirect,
+		Jar:           client.Jar,
+		Timeout:       client.Timeout,
 	}
 
 	resp, err := client.Do(req)

pkg/credentials/sts_web_identity.go

@@ -69,6 +69,10 @@ type WebIdentityToken struct {
 type STSWebIdentity struct {
 	Expiry
 
+	// Optional http Client to use when connecting to MinIO STS service.
+	// (overrides default client in CredContext)
+	Client *http.Client
+
 	// Exported STS endpoint to fetch STS credentials.
 	STSEndpoint string
 
@@ -216,7 +220,12 @@ func getWebIdentityCredentials(clnt *http.Client, endpoint, roleARN, roleSession
 // Retrieve retrieves credentials from the MinIO service.
 // Error will be returned if the request fails.
 func (m *STSWebIdentity) Retrieve(cc *CredContext) (Value, error) {
-	a, err := getWebIdentityCredentials(cc.Client, m.STSEndpoint, m.RoleARN, m.roleSessionName, m.Policy, m.GetWebIDTokenExpiry)
+	client := m.Client
+	if client == nil {
+		client = cc.Client
+	}
+
+	a, err := getWebIdentityCredentials(client, m.STSEndpoint, m.RoleARN, m.roleSessionName, m.Policy, m.GetWebIDTokenExpiry)
 	if err != nil {
 		return Value{}, err
 	}