reproduce and fix issue getkin#382

Signed-off-by: Pierre Fenoll <pierrefenoll@gmail.com>

openapi3/issue382_test.go

@@ -0,0 +1,15 @@
+package openapi3
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOverridingGlobalParametersValidation(t *testing.T) {
+	loader := NewLoader()
+	doc, err := loader.LoadFromFile("testdata/Test_param_override.yml")
+	require.NoError(t, err)
+	err = doc.Validate(loader.Context)
+	require.NoError(t, err)
+}

openapi3/paths.go

@@ -21,31 +21,43 @@ func (value Paths) Validate(ctx context.Context) error {
 			pathItem = value[path]
 		}
 
-		normalizedPath, pathParamsCount := normalizeTemplatedPath(path)
+		normalizedPath, _, varsInPath := normalizeTemplatedPath(path)
 		if oldPath, ok := normalizedPaths[normalizedPath]; ok {
 			return fmt.Errorf("conflicting paths %q and %q", path, oldPath)
 		}
 		normalizedPaths[path] = path
 
-		var globalCount uint
+		var commonParams []string
 		for _, parameterRef := range pathItem.Parameters {
 			if parameterRef != nil {
 				if parameter := parameterRef.Value; parameter != nil && parameter.In == ParameterInPath {
-					globalCount++
+					commonParams = append(commonParams, parameter.Name)
 				}
 			}
 		}
 		for method, operation := range pathItem.Operations() {
-			var count uint
+			var setParams []string
 			for _, parameterRef := range operation.Parameters {
 				if parameterRef != nil {
 					if parameter := parameterRef.Value; parameter != nil && parameter.In == ParameterInPath {
-						count++
+						setParams = append(setParams, parameter.Name)
 					}
 				}
 			}
-			if count+globalCount != pathParamsCount {
-				return fmt.Errorf("operation %s %s must define exactly all path parameters", method, path)
+			if expected := len(setParams) + len(commonParams); expected != len(varsInPath) {
+				expected -= len(varsInPath)
+				if expected < 0 {
+					expected *= -1
+				}
+				missing := make(map[string]struct{}, expected)
+				for _, name := range append(setParams, commonParams...) {
+					if _, ok := varsInPath[name]; !ok {
+						missing[name] = struct{}{}
+					}
+				}
+				if len(missing) != 0 {
+					return fmt.Errorf("operation %s %s must define exactly all path parameters (missing: %v)", method, path, missing)
+				}
 			}
 		}
 
@@ -75,53 +87,61 @@ func (paths Paths) Find(key string) *PathItem {
 		return pathItem
 	}
 
-	normalizedPath, expected := normalizeTemplatedPath(key)
+	normalizedPath, expected, _ := normalizeTemplatedPath(key)
 	for path, pathItem := range paths {
-		pathNormalized, got := normalizeTemplatedPath(path)
+		pathNormalized, got, _ := normalizeTemplatedPath(path)
 		if got == expected && pathNormalized == normalizedPath {
 			return pathItem
 		}
 	}
 	return nil
 }
 
-func normalizeTemplatedPath(path string) (string, uint) {
+func normalizeTemplatedPath(path string) (string, uint, map[string]struct{}) {
 	if strings.IndexByte(path, '{') < 0 {
-		return path, 0
+		return path, 0, nil
 	}
 
-	var buf strings.Builder
-	buf.Grow(len(path))
+	var buffTpl strings.Builder
+	buffTpl.Grow(len(path))
 
 	var (
 		cc         rune
 		count      uint
 		isVariable bool
+		vars       = make(map[string]struct{})
+		buffVar    strings.Builder
 	)
 	for i, c := range path {
 		if isVariable {
 			if c == '}' {
-				// End path variables
+				// End path variable
+				isVariable = false
+
+				vars[buffVar.String()] = struct{}{}
+				buffVar = strings.Builder{}
+
 				// First append possible '*' before this character
 				// The character '}' will be appended
 				if i > 0 && cc == '*' {
-					buf.WriteRune(cc)
+					buffTpl.WriteRune(cc)
 				}
-				isVariable = false
 			} else {
-				// Skip this character
+				buffVar.WriteRune(c)
 				continue
 			}
+
 		} else if c == '{' {
 			// Begin path variable
-			// The character '{' will be appended
 			isVariable = true
+
+			// The character '{' will be appended
 			count++
 		}
 
 		// Append the character
-		buf.WriteRune(c)
+		buffTpl.WriteRune(c)
 		cc = c
 	}
-	return buf.String(), count
+	return buffTpl.String(), count, vars
 }

openapi3/testdata/Test_param_override.yml

@@ -0,0 +1,40 @@
+openapi: 3.0.0
+info:
+  title: customer
+  version: '1.0'
+servers:
+  - url: 'httpbin.kwaf-demo.test'
+paths:
+  '/customers/{customer_id}':
+    parameters:
+      - schema:
+          type: integer
+        name: customer_id
+        in: path
+        required: true
+    get:
+      parameters:
+      - schema:
+          type: integer
+          maximum: 100
+        name: customer_id
+        in: path
+        required: true
+      summary: customer
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  customer_id:
+                    type: integer
+                  customer_name:
+                    type: string
+      operationId: get-customers-customer_id
+      description: Retrieve a specific customer by ID
+components:
+  schemas: {}