chore(release): v1.0.42

.github/dependabot.yml

@@ -0,0 +1,52 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore(deps)"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "github-actions"
+    reviewers:
+      - "lukaszraczylo"
+
+  # Maintain Go module dependencies
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore(deps)"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "go"
+    reviewers:
+      - "lukaszraczylo"
+    # Group patch updates together
+    groups:
+      patch-updates:
+        patterns:
+          - "*"
+        update-types:
+          - "patch"
+      minor-updates:
+        patterns:
+          - "*"
+        update-types:
+          - "minor"
+    # Ignore certain dependencies if needed
+    ignore:
+      # Example: ignore specific versions
+      # - dependency-name: "github.com/example/package"
+      #   versions: ["1.x", "2.x"]

.traefik.yml

@@ -72,13 +72,6 @@ testData:
       value: "{{.Claims.email}}"
     - name: Authorization
       value: "Bearer {{.AccessToken}}"
-    # Object/array claim as one JSON header; the claim must be whitelisted.
-    - name: X-Tenant
-      value: '{{get .Claims "tenant" | toJson}}'
-
-  # Extends the built-in claim whitelist for templated headers.
-  allowedClaims:
-    - tenant
 
   # Security headers (default profile is enabled out of the box)
   securityHeaders:

README.md

@@ -441,34 +441,8 @@ headers:
 Rendering the whole context (`{{.}}`, `{{$}}`), the whole claims map
 (`{{.Claims}}`), or any non-listed claim is rejected — this prevents a template
 from accidentally forwarding raw tokens or unlisted claims. `range`/`with` must
-target a specific listed claim (e.g. `{{range .Claims.groups}}`); `get`, `default`
-and `toJson` are the only functions allowed.
-
-### Forwarding an object claim as JSON
-
-`toJson` serializes a claim (object, array or scalar) to compact JSON, so a
-backend can parse the whole claim itself instead of the middleware flattening
-it into one header per key:
-
-```yaml
-allowedClaims:
-  - tenant
-headers:
-  - name: X-Tenant
-    value: '{{get .Claims "tenant" | toJson}}'   # {"id":"t-1","plan":"pro"}
-  - name: X-Groups
-    value: "{{toJson .Claims.groups}}"           # ["admin","users"]
-```
-
-- The claim must be on the whitelist (built-in or `allowedClaims`).
-  `{{toJson .Claims}}`, `{{toJson .}}` and non-listed claims are rejected.
-- An absent or empty claim skips the header instead of sending `""`.
-- Control characters are JSON-escaped, so a claim cannot inject extra header
-  lines.
-- A rendered value over 8192 bytes, or one with bidi-override characters, is
-  dropped. The oversize case is logged at error level (header name only, never
-  the value); keep the claim small, since proxies commonly cap headers at
-  8-16 KB.
+target a specific listed claim (e.g. `{{range .Claims.groups}}`); `get`/`default`
+are the only functions allowed.
 
 > **File-provider users: escape the braces.** Traefik's file provider runs
 > every dynamic configuration file through Go templating before the plugin

bearer_auth.go

@@ -223,9 +223,6 @@ func headerInjectionRuneReason(r rune) string {
 	return ""
 }
 
-// headerReasonTooLong is the headerValueReason result for an over-long value.
-const headerReasonTooLong = "exceeds max length"
-
 // headerValueReason reports why value is unsafe to forward as a free-form HTTP
 // header value, or "" if acceptable. It rejects values over maxLen (maxLen<=0
 // disables the check) and values containing control or bidi-override runes, but
@@ -233,7 +230,7 @@ const headerReasonTooLong = "exceeds max length"
 // never includes the value, so it is safe to log.
 func headerValueReason(value string, maxLen int) string {
 	if maxLen > 0 && len(value) > maxLen {
-		return headerReasonTooLong
+		return "exceeds max length"
 	}
 	for _, r := range value {
 		if reason := headerInjectionRuneReason(r); reason != "" {

cmd/yaegicheck/main.go

@@ -139,7 +139,6 @@ func main() {
 	runCheck("middleware-erraborthandler-aborts-under-yaegi", checkErrAbortHandlerAbortsUnderYaegi)
 	runCheck("fix17-setifabsent-claims-once", checkSetIfAbsentUnderYaegi)
 	runCheck("issue162-websocket-forwards-header-templates", checkIssue162WebSocketHeaderTemplates)
-	runCheck("tojson-header-template", checkToJsonHeaderTemplate)
 	runCheck("streaming-refresh-revoked-grant-rejected", checkStreamingRefreshRevokedGrant)
 	fmt.Println("OK: all yaegi regression checks passed")
 }
@@ -808,99 +807,6 @@ func checkIssue162WebSocketHeaderTemplates() (string, error) {
 	return "", nil
 }
 
-// checkToJsonHeaderTemplate pins the toJson template helper under the
-// interpreter: its (string, error) closure, json.Marshal of an object claim,
-// the nil/absent-claim skip and the validator's rejection of a whole-claims dump.
-func checkToJsonHeaderTemplate() (string, error) {
-	discovery := servers.NewOIDCServer(nil)
-	defer discovery.Close()
-
-	cfg := oidc.CreateConfig()
-	cfg.ProviderURL = discovery.URL
-	cfg.ClientID = "yaegi-check-tojson-client"
-	cfg.ClientSecret = "yaegi-check-tojson-secret"
-	cfg.CallbackURL = "/oauth2/callback"
-	cfg.SessionEncryptionKey = "0123456789abcdef0123456789abcdef"
-	cfg.AllowedClaims = []string{"tenant"}
-	cfg.Headers = []oidc.TemplatedHeader{
-		{Name: "X-Tenant", Value: `{{ get .Claims "tenant" | toJson }}`},
-		{Name: "X-Groups", Value: "{{ toJson .Claims.groups }}"},
-		{Name: "X-Missing", Value: "{{ toJson .Claims.department }}"},
-	}
-	if err := cfg.Validate(); err != nil {
-		return "", fmt.Errorf("toJson headers must validate: %w", err)
-	}
-
-	bad := oidc.CreateConfig()
-	*bad = *cfg
-	bad.Headers = []oidc.TemplatedHeader{{Name: "X-All", Value: "{{ toJson .Claims }}"}}
-	if err := bad.Validate(); err == nil {
-		return "", fmt.Errorf("toJson of the whole claims map must fail validation")
-	}
-
-	var seen http.Header
-	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		seen = r.Header.Clone()
-	})
-	h, err := oidc.New(context.Background(), next, cfg, "yaegi-check-tojson")
-	if err != nil {
-		return "", fmt.Errorf("New: %w", err)
-	}
-	if closer, ok := h.(interface{ Close() error }); ok {
-		defer closer.Close()
-	}
-
-	sm, err := oidc.NewSessionManager(cfg.SessionEncryptionKey, cfg.ForceHTTPS, cfg.CookieDomain, cfg.CookiePrefix, time.Duration(cfg.SessionMaxAge)*time.Second, oidc.NewLogger("error"))
-	if err != nil {
-		return "", fmt.Errorf("NewSessionManager: %w", err)
-	}
-	defer sm.Shutdown()
-
-	setupReq := httptest.NewRequest("GET", "/ws", nil)
-	session, err := sm.GetSession(setupReq)
-	if err != nil {
-		return "", fmt.Errorf("GetSession: %w", err)
-	}
-	if err := session.SetAuthenticated(true); err != nil {
-		return "", fmt.Errorf("SetAuthenticated: %w", err)
-	}
-	session.SetUserIdentifier("[email protected]")
-	b64 := base64.RawURLEncoding.EncodeToString
-	sig := make([]byte, 32)
-	for i := range sig {
-		sig[i] = byte(i + 1)
-	}
-	session.SetIDToken(b64([]byte(`{"alg":"RS256","typ":"JWT"}`)) + "." + b64([]byte(`{"tenant":{"id":"t-1","plan":"pro"},"groups":["a","b"]}`)) + "." + b64(sig))
-	rec := httptest.NewRecorder()
-	if err := session.Save(setupReq, rec); err != nil {
-		return "", fmt.Errorf("session.Save: %w", err)
-	}
-	session.ReturnToPool()
-
-	req := httptest.NewRequest("GET", "/ws", nil)
-	for _, c := range rec.Result().Cookies() {
-		req.AddCookie(c)
-	}
-	req.Header.Set("Upgrade", "websocket")
-	req.Header.Set("Connection", "Upgrade")
-	rw := httptest.NewRecorder()
-	h.ServeHTTP(rw, req)
-
-	if seen == nil {
-		return "", fmt.Errorf("next was not reached (status %d)", rw.Code)
-	}
-	if got, want := seen.Get("X-Tenant"), `{"id":"t-1","plan":"pro"}`; got != want {
-		return "", fmt.Errorf("X-Tenant = %q, want %q", got, want)
-	}
-	if got, want := seen.Get("X-Groups"), `["a","b"]`; got != want {
-		return "", fmt.Errorf("X-Groups = %q, want %q", got, want)
-	}
-	if got := seen.Get("X-Missing"); got != "" {
-		return "", fmt.Errorf("X-Missing = %q, want header skipped", got)
-	}
-	return "", nil
-}
-
 // checkStreamingRefreshRevokedGrant drives streamingRefresh under the
 // interpreter through the real RefreshCoordinator and token exchanger: an
 // expired session whose refresh the IdP answers with invalid_grant must get

docs/CONFIGURATION.md

@@ -571,7 +571,7 @@ be emitted — the standard OIDC claims plus common provider claims (`email`,
 `phone_number`, `email_verified`, `updated_at`; the authoritative list is
 `safeClaimsFields` in `template_validation.go`). Rejected: rendering the whole
 context (`{{.}}`, `{{$}}`) or the whole claims map (`{{.Claims}}`), any claim not
-on the list, functions other than `get`/`default`/`toJson`, and `range`/`with` that do not
+on the list, functions other than `get`/`default`, and `range`/`with` that do not
 target a specific listed claim (e.g. `{{range .Claims}}` is rejected; `{{range
 .Claims.groups}}` is allowed).
 
@@ -592,21 +592,6 @@ Listed names apply to both direct access (`{{.Claims.employee_id}}`) and
 claim (e.g. `realm_access.roles`) are already accessible without listing them
 individually.
 
-**`toJson`** forwards an object or array claim as one JSON header:
-
-```yaml
-allowedClaims:
-  - tenant
-headers:
-  - name: "X-Tenant"
-    value: "{{get .Claims \"tenant\" | toJson}}"
-```
-
-It only serializes values the template can already reach, so the whitelist
-still applies; `{{toJson .Claims}}` is rejected. Control characters are
-JSON-escaped, and values over 8192 bytes or with bidi-override characters are
-dropped; an oversize value is logged at error level (header name only).
-
 ---
 
 ## Security Headers

main.go

@@ -7,7 +7,6 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"net/http"
@@ -86,10 +85,8 @@ var defaultExcludedURLs = map[string]struct{}{
 
 // headerTemplateFuncMap returns the function map available to custom header
 // value templates, gated by the effective claims whitelist (built-in +
-// config.AllowedClaims). It exposes exactly three helpers:
+// config.AllowedClaims). It exposes exactly two helpers:
 //   - default: substitute a fallback when a value is nil/empty.
-//   - toJson: serialize a value (e.g. an object claim) to compact JSON; nil and
-//     "" yield "" so an absent claim skips the header instead of sending `""`.
 //   - get: safe map access RESTRICTED to whitelisted claim keys, so it cannot be
 //     used to read a non-whitelisted claim, a raw token, or the whole data map
 //     (issue #149 review). This is the sole runtime enforcement of the claims
@@ -105,16 +102,6 @@ func headerTemplateFuncMap(allowedClaims map[string]bool) template.FuncMap {
 			}
 			return val
 		},
-		"toJson": func(val interface{}) (string, error) {
-			if val == nil || val == "" {
-				return "", nil
-			}
-			b, err := json.Marshal(val)
-			if err != nil {
-				return "", err
-			}
-			return string(b), nil
-		},
 		"get": func(m interface{}, key string) interface{} {
 			if !allowedClaims[key] {
 				return ""

middleware.go

@@ -1371,11 +1371,7 @@ func (t *TraefikOidc) applyHeaderTemplates(req *http.Request, p *principal) {
 		// forwarding a tainted value. Do not log the value (it commonly
 		// carries the access token); log only name + reason.
 		if reason := headerValueReason(headerValue, headerTemplateMaxLen); reason != "" {
-			if reason == headerReasonTooLong {
-				t.logger.Errorf("Dropping templated header %s: rendered value exceeds %d bytes", headerName, headerTemplateMaxLen)
-			} else {
-				t.logger.Debugf("Dropping templated header %s: value failed sanitization (%s)", headerName, reason)
-			}
+			t.logger.Debugf("Dropping templated header %s: value failed sanitization (%s)", headerName, reason)
 			continue
 		}
 		req.Header.Set(headerName, headerValue)

template_validation.go

@@ -22,7 +22,6 @@ var allowedRootTokenFields = map[string]bool{
 var validateTemplateParseFuncs = map[string]any{
 	"get":     struct{}{},
 	"default": struct{}{},
-	"toJson":  struct{}{},
 }
 
 // claimsWhitelist returns the effective set of claim field names a header
@@ -184,14 +183,12 @@ func (v *templateValidator) validateCommand(cmd *parse.CommandNode, dotIsRoot bo
 	return nil
 }
 
-// validateFunctionCall allows only get/default/toJson. get's map argument must be a
+// validateFunctionCall allows only get/default. get's map argument must be a
 // claims reference (never the root) and default's arguments are validated as
 // values; the runtime get additionally enforces the key whitelist.
 func (v *templateValidator) validateFunctionCall(name string, args []parse.Node, dotIsRoot bool) error {
 	switch name {
-	case "default", "toJson":
-		// toJson only serializes what its (validated) arguments or piped input
-		// already expose; it cannot reach anything a direct reference could not.
+	case "default":
 		for _, arg := range args {
 			if err := v.validateValue(arg, dotIsRoot); err != nil {
 				return err

tojson_template_test.go

@@ -1,286 +0,0 @@
-package traefikoidc
-
-import (
-	"encoding/json"
-	"net/http/httptest"
-	"strings"
-	"testing"
-	"text/template"
-)
-
-// renderHeaderTemplate runs tmplStr through the same validator, funcMap and
-// applyHeaderTemplates path production uses. validateErr is the static-validation
-// error; got is the forwarded header value ("" when absent or dropped).
-func renderHeaderTemplate(t *testing.T, tmplStr string, extraClaims []string, claims map[string]interface{}) (got string, validateErr error) {
-	t.Helper()
-	allowed := claimsWhitelist(extraClaims)
-	if err := validateTemplateSecure(tmplStr, allowed); err != nil {
-		return "", err
-	}
-	tmpl, err := template.New("X-Test").Funcs(headerTemplateFuncMap(allowed)).Option("missingkey=zero").Parse(tmplStr)
-	if err != nil {
-		t.Fatalf("validated template failed to parse: %v", err)
-	}
-	o := &TraefikOidc{logger: NewLogger("error"), headerTemplates: map[string]*template.Template{"X-Test": tmpl}}
-	req := httptest.NewRequest("GET", "/", nil)
-	o.applyHeaderTemplates(req, &principal{Claims: claims, AccessToken: "AT-SECRET", IDToken: "IDT-SECRET", RefreshToken: "RT-SECRET"})
-	return req.Header.Get("X-Test"), nil
-}
-
-func TestToJson_ObjectClaimRoundTrips(t *testing.T) {
-	claims := map[string]interface{}{
-		"tenant": map[string]interface{}{"id": "t-1", "plan": "pro", "flags": []interface{}{"a", "b"}, "n": 3.0, "ok": true, "nil": nil},
-	}
-	for _, tmpl := range []string{
-		`{{ get .Claims "tenant" | toJson }}`,
-		`{{ toJson (get .Claims "tenant") }}`,
-		`{{ toJson .Claims.tenant }}`,
-		`{{ with .Claims.tenant }}{{ toJson . }}{{ end }}`,
-		`{{ $t := .Claims.tenant }}{{ toJson $t }}`,
-		`{{ toJson $.Claims.tenant }}`,
-	} {
-		got, err := renderHeaderTemplate(t, tmpl, []string{"tenant"}, claims)
-		if err != nil {
-			t.Fatalf("%s: unexpected validation error: %v", tmpl, err)
-		}
-		var back map[string]interface{}
-		if err := json.Unmarshal([]byte(got), &back); err != nil {
-			t.Fatalf("%s: output %q is not valid JSON: %v", tmpl, got, err)
-		}
-		if back["id"] != "t-1" || back["plan"] != "pro" || back["n"] != 3.0 || back["ok"] != true {
-			t.Fatalf("%s: round trip mismatch: %q", tmpl, got)
-		}
-	}
-}
-
-func TestToJson_ValueTypes(t *testing.T) {
-	claims := map[string]interface{}{
-		"groups": []interface{}{"admin", "users"},
-		"email":  "[email protected]",
-		"exp":    1700000000.0,
-		"role":   "",
-	}
-	cases := []struct{ name, tmpl, want string }{
-		{"array", `{{ toJson .Claims.groups }}`, `["admin","users"]`},
-		{"string", `{{ toJson .Claims.email }}`, `"[email protected]"`},
-		{"number", `{{ toJson .Claims.exp }}`, `1700000000`},
-		{"missing claim skips header", `{{ toJson .Claims.department }}`, ``},
-		{"missing via get skips header", `{{ get .Claims "department" | toJson }}`, ``},
-		{"empty string skips header", `{{ toJson .Claims.role }}`, ``},
-		{"literal string", `{{ toJson "x" }}`, `"x"`},
-		{"literal number", `{{ toJson 5 }}`, `5`},
-		{"composes with surrounding text", `v={{ toJson .Claims.groups }};`, `v=["admin","users"];`},
-	}
-	for _, c := range cases {
-		got, err := renderHeaderTemplate(t, c.tmpl, nil, claims)
-		if err != nil {
-			t.Fatalf("%s: unexpected validation error: %v", c.name, err)
-		}
-		if got != c.want {
-			t.Errorf("%s: got %q want %q", c.name, got, c.want)
-		}
-	}
-}
-
-func TestToJson_EmptyAndNilContainers(t *testing.T) {
-	claims := map[string]interface{}{
-		"realm_access": map[string]interface{}{},
-		"groups":       []interface{}{},
-	}
-	if got, _ := renderHeaderTemplate(t, `{{ toJson .Claims.realm_access }}`, nil, claims); got != `{}` {
-		t.Errorf("empty object: got %q", got)
-	}
-	if got, _ := renderHeaderTemplate(t, `{{ toJson .Claims.groups }}`, nil, claims); got != `[]` {
-		t.Errorf("empty array: got %q", got)
-	}
-	if got, _ := renderHeaderTemplate(t, `{{ toJson .Claims.groups }}`, nil, nil); got != `` {
-		t.Errorf("nil claims: got %q", got)
-	}
-}
-
-func TestToJson_UnmarshalableValueDropsHeader(t *testing.T) {
-	fn := headerTemplateFuncMap(nil)["toJson"].(func(interface{}) (string, error))
-	if _, err := fn(make(chan int)); err == nil {
-		t.Fatal("expected error for unmarshalable value")
-	}
-	// A non-finite float is the only way a claim map could carry one in.
-	if _, err := fn(map[string]interface{}{"x": func() {}}); err == nil {
-		t.Fatal("expected error for func value")
-	}
-}
-
-// Security: toJson must not widen what a template can reach.
-func TestToJson_SecurityBoundary(t *testing.T) {
-	claims := map[string]interface{}{
-		"email":  "[email protected]",
-		"secret": "NOT-WHITELISTED",
-		"tenant": map[string]interface{}{"id": "t"},
-	}
-	rejected := []string{
-		`{{ toJson . }}`,
-		`{{ toJson $ }}`,
-		`{{ toJson .Claims }}`,
-		`{{ toJson $.Claims }}`,
-		`{{ .Claims | toJson }}`,
-		`{{ toJson .Claims.secret }}`,
-		`{{ toJson $.Claims.secret }}`,
-		`{{ toJson .AccessToken }}{{ toJson .Claims }}`,
-		`{{ get .Claims "secret" | toJson }}`,
-		`{{ toJson (get . "AccessToken") }}`,
-		`{{ get . "Claims" | toJson }}`,
-		`{{ with .Claims }}{{ toJson . }}{{ end }}`,
-		`{{ range .Claims }}{{ toJson . }}{{ end }}`,
-		`{{ toJson (index .Claims "secret") }}`,
-		`{{ toJson (printf "%v" .Claims) }}`,
-		`{{ toJson (call .Claims) }}`,
-		`{{ tojson .Claims.email }}`,
-		`{{ toJSON .Claims.email }}`,
-		`{{ toJson | js }}`,
-	}
-	for _, tmpl := range rejected {
-		if got, err := renderHeaderTemplate(t, tmpl, nil, claims); err == nil {
-			t.Errorf("%s: must be rejected by validation, rendered %q", tmpl, got)
-		}
-	}
-
-	// Dynamic key: static validation cannot see it, the runtime whitelist must.
-	dyn := `{{ get .Claims .Claims.email | toJson }}`
-	if got, err := renderHeaderTemplate(t, dyn, nil, map[string]interface{}{"email": "secret", "secret": "LEAK"}); err != nil || strings.Contains(got, "LEAK") {
-		t.Errorf("dynamic key leaked a non-whitelisted claim: err=%v got=%q", err, got)
-	}
-}
-
-// Security: tokens and the claims map never appear in output, even from a
-// validated template that serializes a whitelisted claim.
-func TestToJson_NoTokenLeak(t *testing.T) {
-	claims := map[string]interface{}{"tenant": map[string]interface{}{"id": "t"}}
-	got, err := renderHeaderTemplate(t, `{{ toJson .Claims.tenant }}`, []string{"tenant"}, claims)
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, s := range []string{"AT-SECRET", "IDT-SECRET", "RT-SECRET"} {
-		if strings.Contains(got, s) {
-			t.Fatalf("token %s leaked into %q", s, got)
-		}
-	}
-}
-
-// Security: a non-whitelisted claim stays unreachable until the operator opts
-// in via allowedClaims, with or without toJson.
-func TestToJson_RequiresAllowedClaims(t *testing.T) {
-	claims := map[string]interface{}{"tenant": map[string]interface{}{"id": "t"}}
-	if _, err := renderHeaderTemplate(t, `{{ toJson .Claims.tenant }}`, nil, claims); err == nil {
-		t.Error("direct reference to non-whitelisted claim must be rejected")
-	}
-	got, err := renderHeaderTemplate(t, `{{ get .Claims "tenant" | toJson }}`, nil, claims)
-	if err == nil {
-		t.Errorf("literal get key outside whitelist must be rejected, rendered %q", got)
-	}
-}
-
-// Security: hostile claim content must not produce header injection.
-func TestToJson_HeaderInjectionHardening(t *testing.T) {
-	cases := []struct {
-		name  string
-		value interface{}
-		// forwarded reports whether the header is expected to reach upstream.
-		forwarded bool
-	}{
-		{"CRLF is escaped to \\r\\n", map[string]interface{}{"x": "a\r\nX-Evil: 1"}, true},
-		{"NUL and control chars escaped", map[string]interface{}{"x": "a\x00\x07b"}, true},
-		{"LS/PS escaped", map[string]interface{}{"x": "a

b"}, true},
-		{"HTML chars escaped", map[string]interface{}{"x": "<script>&"}, true},
-		{"quote and backslash escaped", map[string]interface{}{"x": `"\`}, true},
-		{"bidi override dropped by sanitizer", map[string]interface{}{"x": "a\u202Eb"}, false},
-		{"bidi isolate dropped by sanitizer", map[string]interface{}{"x": "a\u2066b"}, false},
-		{"oversize dropped by sanitizer", map[string]interface{}{"x": strings.Repeat("A", headerTemplateMaxLen)}, false},
-	}
-	for _, c := range cases {
-		got, err := renderHeaderTemplate(t, `{{ toJson .Claims.realm_access }}`, nil, map[string]interface{}{"realm_access": c.value})
-		if err != nil {
-			t.Fatalf("%s: %v", c.name, err)
-		}
-		if !c.forwarded {
-			if got != "" {
-				t.Errorf("%s: tainted value must be dropped, got %d bytes", c.name, len(got))
-			}
-			continue
-		}
-		if got == "" {
-			t.Errorf("%s: safe escaped JSON must be forwarded", c.name)
-			continue
-		}
-		for _, r := range got {
-			if r < 0x20 || r == 0x7f || r == 0x2028 || r == 0x2029 {
-				t.Errorf("%s: raw control rune %U in %q", c.name, r, got)
-			}
-		}
-		if strings.ContainsAny(got, "<>&") {
-			t.Errorf("%s: unescaped HTML char in %q", c.name, got)
-		}
-		var back map[string]interface{}
-		if err := json.Unmarshal([]byte(got), &back); err != nil {
-			t.Errorf("%s: not valid JSON: %v", c.name, err)
-		}
-	}
-}
-
-// Default-preserving: existing templates are unaffected and toJson is not
-// available to anything but validated header templates.
-func TestToJson_ExistingTemplatesUnchanged(t *testing.T) {
-	claims := map[string]interface{}{"email": "[email protected]", "groups": []interface{}{"x", "y"}}
-	got, err := renderHeaderTemplate(t, `{{ .Claims.email }}|{{range $i, $e := .Claims.groups}}{{if $i}},{{end}}{{$e}}{{end}}|{{ default "d" .Claims.role }}`, nil, claims)
-	if err != nil || got != "[email protected]|x,y|d" {
-		t.Fatalf("got %q err=%v", got, err)
-	}
-	if _, ok := headerTemplateFuncMap(nil)["toJson"]; !ok {
-		t.Fatal("toJson missing from func map")
-	}
-	for _, name := range []string{"env", "expandenv", "printf", "call", "index", "js"} {
-		if _, ok := headerTemplateFuncMap(nil)[name]; ok {
-			t.Errorf("%s must not be exposed", name)
-		}
-	}
-}
-
-func TestToJson_ConfigValidate(t *testing.T) {
-	cfg := issue149BaseConfig()
-	cfg.AllowedClaims = []string{"tenant"}
-	cfg.Headers = []TemplatedHeader{{Name: "X-Tenant", Value: `{{ get .Claims "tenant" | toJson }}`}}
-	if err := cfg.Validate(); err != nil {
-		t.Fatalf("toJson header must validate: %v", err)
-	}
-	cfg.Headers = []TemplatedHeader{{Name: "X-All", Value: `{{ toJson .Claims }}`}}
-	if err := cfg.Validate(); err == nil {
-		t.Fatal("toJson of whole Claims must fail validation")
-	}
-}
-
-// Oversize output is operator-actionable, so it logs at error level (name and
-// size limit only, never the value); other sanitizer drops stay at debug.
-func TestToJson_OversizeLogsError(t *testing.T) {
-	run := func(claim map[string]interface{}) string {
-		var buf strings.Builder
-		logger := NewLogger("debug")
-		logger.logError.SetOutput(&buf)
-		tmpl := template.Must(template.New("X-Test").Funcs(headerTemplateFuncMap(nil)).Parse(`{{ toJson .Claims.realm_access }}`))
-		o := &TraefikOidc{logger: logger, headerTemplates: map[string]*template.Template{"X-Test": tmpl}}
-		req := httptest.NewRequest("GET", "/", nil)
-		o.applyHeaderTemplates(req, &principal{Claims: map[string]interface{}{"realm_access": claim}})
-		if req.Header.Get("X-Test") != "" {
-			t.Fatal("tainted header must be dropped")
-		}
-		return buf.String()
-	}
-	big := strings.Repeat("S3CRET", headerTemplateMaxLen)
-	out := run(map[string]interface{}{"x": big})
-	if !strings.Contains(out, "X-Test") || !strings.Contains(out, "exceeds") {
-		t.Errorf("oversize must log an error naming the header, got %q", out)
-	}
-	if strings.Contains(out, "S3CRET") {
-		t.Error("error log must not contain the value")
-	}
-	if out := run(map[string]interface{}{"x": "a\u202Eb"}); out != "" {
-		t.Errorf("non-length sanitizer drop must not log at error level, got %q", out)
-	}
-}

version.go

@@ -14,4 +14,4 @@ const devPluginVersion = "0.0.0-dev"
 // from build info at runtime (debug.ReadBuildInfo sees Traefik's build graph,
 // not the interpreted plugin). This build-stamped constant is therefore the
 // single source of truth for the version reported by anonymous usage telemetry.
-const traefikoidcPluginVersion = "1.0.44"
+const traefikoidcPluginVersion = "1.0.42"