openapi3filter: fix crash when given arrays of objects as query param…

…eters (#664)

openapi3filter/issue625_test.go

@@ -0,0 +1,123 @@
+package openapi3filter_test
+
+import (
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/getkin/kin-openapi/openapi3"
+	"github.com/getkin/kin-openapi/openapi3filter"
+	"github.com/getkin/kin-openapi/routers/gorillamux"
+)
+
+func TestIssue625(t *testing.T) {
+
+	anyOfArraySpec := `
+openapi: 3.0.0
+info:
+  version: 1.0.0
+  title: Sample API
+paths:
+ /items:
+  get:
+    description: Returns a list of stuff
+    parameters:
+    - description: test object
+      explode: false
+      in: query
+      name: test
+      required: false
+      schema:
+        type: array
+        items:
+         anyOf:
+          - type: integer
+          - type: boolean
+    responses:
+      '200':
+        description: Successful response
+`[1:]
+
+	oneOfArraySpec := strings.ReplaceAll(anyOfArraySpec, "anyOf", "oneOf")
+
+	allOfArraySpec := strings.ReplaceAll(strings.ReplaceAll(anyOfArraySpec, "anyOf", "allOf"),
+		"type: boolean", "type: number")
+
+	tests := []struct {
+		name   string
+		spec   string
+		req    string
+		errStr string
+	}{
+		{
+			name: "success anyof object array",
+			spec: anyOfArraySpec,
+			req:  "/items?test=3,7",
+		},
+		{
+			name:   "failed anyof object array",
+			spec:   anyOfArraySpec,
+			req:    "/items?test=s1,s2",
+			errStr: `parameter "test" in query has an error: path 0: value s1: an invalid boolean: invalid syntax`,
+		},
+
+		{
+			name: "success allof object array",
+			spec: allOfArraySpec,
+			req:  `/items?test=1,3`,
+		},
+		{
+			name:   "failed allof object array",
+			spec:   allOfArraySpec,
+			req:    `/items?test=1.2,3.1`,
+			errStr: `parameter "test" in query has an error: Value must be an integer`,
+		},
+		{
+			name: "success oneof object array",
+			spec: oneOfArraySpec,
+			req:  `/items?test=true,3`,
+		},
+		{
+			name:   "faled oneof object array",
+			spec:   oneOfArraySpec,
+			req:    `/items?test="val1","val2"`,
+			errStr: `parameter "test" in query has an error: item 0: decoding oneOf failed: 0 schemas matched`,
+		},
+	}
+
+	for _, testcase := range tests {
+		t.Run(testcase.name, func(t *testing.T) {
+			loader := openapi3.NewLoader()
+			ctx := loader.Context
+
+			doc, err := loader.LoadFromData([]byte(testcase.spec))
+			require.NoError(t, err)
+
+			err = doc.Validate(ctx)
+			require.NoError(t, err)
+
+			router, err := gorillamux.NewRouter(doc)
+			require.NoError(t, err)
+			httpReq, err := http.NewRequest(http.MethodGet, testcase.req, nil)
+			require.NoError(t, err)
+
+			route, pathParams, err := router.FindRoute(httpReq)
+			require.NoError(t, err)
+
+			requestValidationInput := &openapi3filter.RequestValidationInput{
+				Request:    httpReq,
+				PathParams: pathParams,
+				Route:      route,
+			}
+			err = openapi3filter.ValidateRequest(ctx, requestValidationInput)
+			if testcase.errStr == "" {
+				require.NoError(t, err)
+			} else {
+				require.Contains(t, err.Error(), testcase.errStr)
+			}
+		},
+		)
+	}
+}

openapi3filter/req_resp_decoder.go

@@ -526,10 +526,92 @@ func (d *urlValuesDecoder) DecodeArray(param string, sm *openapi3.SerializationM
 		}
 		values = strings.Split(values[0], delim)
 	}
-	val, err := parseArray(values, schema)
+	val, err := d.parseArray(values, sm, schema)
 	return val, ok, err
 }
 
+// parseArray returns an array that contains items from a raw array.
+// Every item is parsed as a primitive value.
+// The function returns an error when an error happened while parse array's items.
+func (d *urlValuesDecoder) parseArray(raw []string, sm *openapi3.SerializationMethod, schemaRef *openapi3.SchemaRef) ([]interface{}, error) {
+	var value []interface{}
+
+	for i, v := range raw {
+		item, err := d.parseValue(v, schemaRef.Value.Items)
+		if err != nil {
+			if v, ok := err.(*ParseError); ok {
+				return nil, &ParseError{path: []interface{}{i}, Cause: v}
+			}
+			return nil, fmt.Errorf("item %d: %w", i, err)
+		}
+
+		// If the items are nil, then the array is nil. There shouldn't be case where some values are actual primitive
+		// values and some are nil values.
+		if item == nil {
+			return nil, nil
+		}
+		value = append(value, item)
+	}
+	return value, nil
+}
+
+func (d *urlValuesDecoder) parseValue(v string, schema *openapi3.SchemaRef) (interface{}, error) {
+	if len(schema.Value.AllOf) > 0 {
+		var value interface{}
+		var err error
+		for _, sr := range schema.Value.AllOf {
+			value, err = d.parseValue(v, sr)
+			if value == nil || err != nil {
+				break
+			}
+		}
+		return value, err
+	}
+
+	if len(schema.Value.AnyOf) > 0 {
+		var value interface{}
+		var err error
+		for _, sr := range schema.Value.AnyOf {
+			value, err = d.parseValue(v, sr)
+			if err == nil {
+				return value, nil
+			}
+		}
+
+		return nil, err
+	}
+
+	if len(schema.Value.OneOf) > 0 {
+		isMatched := 0
+		var value interface{}
+		var err error
+		for _, sr := range schema.Value.OneOf {
+			result, err := d.parseValue(v, sr)
+			if err == nil {
+				value = result
+				isMatched++
+			}
+		}
+		if isMatched == 1 {
+			return value, nil
+		} else if isMatched > 1 {
+			return nil, fmt.Errorf("decoding oneOf failed: %d schemas matched", isMatched)
+		} else if isMatched == 0 {
+			return nil, fmt.Errorf("decoding oneOf failed: %d schemas matched", isMatched)
+		}
+
+		return nil, err
+	}
+
+	if schema.Value.Not != nil {
+		// TODO(decode not): handle decoding "not" JSON Schema
+		return nil, errors.New("not implemented: decoding 'not'")
+	}
+
+	return parsePrimitive(v, schema)
+
+}
+
 func (d *urlValuesDecoder) DecodeObject(param string, sm *openapi3.SerializationMethod, schema *openapi3.SchemaRef) (map[string]interface{}, bool, error) {
 	var propsFn func(url.Values) (map[string]string, error)
 	switch sm.Style {