87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package contenttype
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import (
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"strings"
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ceproto "github.com/cloudevents/sdk-go/binding/format/protobuf/v2"
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"github.com/cloudevents/sdk-go/v2/event"
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)
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const (
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// CloudEventContentType is the content type for cloud event.
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CloudEventContentType = "application/cloudevents+json"
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// JSONContentType is the content type for JSON.
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JSONContentType = "application/json"
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// ProtobufContentType is the MIME media type for Protobuf.
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ProtobufContentType = "application/x-protobuf"
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// This is the MIME media type for CloudEvent Protobuf.
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CloudEventProtobufContentType = "application/cloudevents+protobuf"
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)
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// IsCloudEventContentType checks for content type.
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func IsCloudEventContentType(contentType string) bool {
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return isContentType(contentType, CloudEventContentType)
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}
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// IsJSONContentType checks for content type.
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func IsJSONContentType(contentType string) bool {
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return isContentType(contentType, JSONContentType)
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}
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// IsStringContentType determines if content type is string.
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func IsStringContentType(contentType string) bool {
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if strings.HasPrefix(strings.ToLower(contentType), "text/") {
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return true
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}
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return isContentType(contentType, "application/xml")
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}
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// IsBinaryContentType determines if content type is byte[].
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func IsBinaryContentType(contentType string) bool {
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return isContentType(contentType, "application/octet-stream")
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}
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func isContentType(contentType string, expected string) bool {
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lowerContentType := strings.ToLower(contentType)
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if lowerContentType == expected {
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return true
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}
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semiColonPos := strings.Index(lowerContentType, ";")
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if semiColonPos >= 0 {
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return lowerContentType[0:semiColonPos] == expected
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}
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return false
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}
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func IsCloudEventProtobuf(contentType string, data []byte) bool {
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if isContentType(contentType, CloudEventProtobufContentType) {
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return true
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}
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// We need to verify that the protobuf is a valid CloudEvent.
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if isContentType(contentType, ProtobufContentType) {
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var e event.Event
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err := ceproto.Protobuf.Unmarshal(data, &e)
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if err != nil {
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return false
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}
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return true
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}
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return false
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}
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