我无法在本地堆栈上使用带有Terraform的API网关来启用二进制支持。
该示例很简单:Lambda生成类似于Github的化身,并将图像返回为PNG。
Lambda(代理)与API网关集成(想法是:GET /avatars/{username}
-> image / png)
当我调用发布的URL时(我正在Localstack上执行此操作),API始终返回Base64编码的图像,而不应用CONVERT_TO_BINARY
。
这是基本步骤...
resource "aws_api_gateway_rest_api" "api" {
name = var.api_name
# enable support for 'image/png'
binary_media_types = [
"image/png",
]
}
GET /avatars/{username}
端点:# ReST API endpoint 'avatars'
resource "aws_api_gateway_resource" "avatars" {
rest_api_id = aws_api_gateway_rest_api.api.id
parent_id = aws_api_gateway_rest_api.api.root_resource_id
path_part = "avatars"
}
# 'avatars' endpoint resource path parameter.
resource "aws_api_gateway_resource" "resource" {
rest_api_id = aws_api_gateway_rest_api.api.id
parent_id = aws_api_gateway_resource.avatars.id
path_part = "{username}"
}
# Defines the resource HTTP method (verb or action).
resource "aws_api_gateway_method" "get-avatar" {
rest_api_id = aws_api_gateway_rest_api.api.id
resource_id = aws_api_gateway_resource.resource.id
http_method = "GET"
authorization = "NONE"
request_parameters = {
"method.request.path.username" = true
}
}
GET /avatars/{username}
端点集成到ReST API中:resource "aws_api_gateway_integration" "resource_integration" {
rest_api_id = aws_api_gateway_rest_api.api.id
resource_id = aws_api_gateway_resource.resource.id
http_method = aws_api_gateway_method.get-avatar.http_method
type = "AWS_PROXY"
integration_http_method = "POST"
uri = aws_lambda_function.lambda.invoke_arn
passthrough_behavior = "WHEN_NO_MATCH"
request_parameters = {
"integration.request.path.id" = "method.request.path.username"
}
}
resource "aws_api_gateway_integration_response" "get-avatar-response" {
rest_api_id = aws_api_gateway_rest_api.api.id
resource_id = aws_api_gateway_resource.resource.id
http_method = aws_api_gateway_method.get-avatar.http_method
status_code = "200"
content_handling = "CONVERT_TO_BINARY"
}
resource "aws_api_gateway_deployment" "deployment" {
rest_api_id = aws_api_gateway_rest_api.api.id
stage_name = "stage"
depends_on = [aws_api_gateway_method.get-avatar, aws_api_gateway_integration.resource_integration]
}
API网关假定文本数据是base64编码的字符串,并将二进制数据输出为base64编码的blob。
这里是简单的Lambda处理程序(当然,在Go很棒!:-)中)
func handler(ctx context.Context, evt events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
log.Printf("Processing request data for request %s.\n", evt.RequestContext.RequestID)
username := evt.PathParameters["username"]
if len(username) == 0 {
code := http.StatusBadRequest
msg := http.StatusText(code)
return events.APIGatewayProxyResponse{Body: msg, StatusCode: code}, nil
}
key := []byte{0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF}
icon := identicon.New7x7(key)
log.Printf("creating identicon for '%s'\n", username)
pngdata := icon.Render([]byte(username))
body := base64.StdEncoding.EncodeToString(pngdata) // <= Base64 Encoded Response
return events.APIGatewayProxyResponse{
Body: body,
Headers: map[string]string{
"Content-Type": "image/png",
},
IsBase64Encoded: true, // <= Is Base64 Encoded? Yes!
StatusCode: 200,
}, nil
}
使用curl调用端点(例如):
curl 'http://localhost:4566/restapis/8nilx7bu49/stage/_user_request_/avatars/type-a-username-here'
...它以Base64编码的图像作为响应。实际上,如果我将输出通过管道传递到base64 -d
以保存内容,则图像是正确的:
curl 'http://localhost:4566/restapis/8nilx7bu49/stage/_user_request_/avatars/type-a-username-here' -s | base64 -d > test.png
有人可以指出我的缺失或困惑吗?
祝一切顺利, 路卡
答案 0 :(得分:0)
我通过使用“ * / *”作为binary_media_types使其正常工作。我在某处读到,如果您指定某些内容,则客户端需要发送相同的接受内容标头。
我也没有aws_api_gateway_integration_response资源。
最后,我以ByteArray的形式返回原始图像字节。我正在使用Kotlin来实现我的lambda,但是下面的内容应该可以让您了解如何做到这一点。
@Get("/{id}/avatar")
fun getImage(id: Long): HttpResponse<ByteArray> {
logger.info { "AvatarController.getImage($id)" }
val image = avatarService.getImage(id)
val bytes: ByteArray = IOUtils.toByteArray(image)
return HttpResponse.ok(bytes).contentType(MediaType.APPLICATION_OCTET_STREAM_TYPE)
不对Base64进行编码,也不使用APIGatewayProxyResponse。