AWS ApiGateway请求路径映射+lambda

Question

我知道有很多关于映射请求数据的问题，但这两个都帮不了我。所以，我试图实现的是一个映射到lambda的APIendpoint。当bucket触发404时，将转发到该endpoint的请求，并且参数通过请求路径传递给lambda，例如：/{image_name}/{width}/{height}。lambda的代码只调用context.succeed(event，context)；

在集成请求中，我创建了三个映射模板:plain/text、plain/html、application/json，其定义与Bellow相同：

#set($inputRoot = $input.path('$'))
{
    "name": $input.params('name'),
    "width" : $input.params('width'),
    "height" : $input.params('height'),
    "params": $input.params(),
    "resourcePath": $context.resourcePath,
}

当从chrome rest客户端调用时,我得到：

Execution log for request test-request
Tue Sep 08 09:10:20 UTC 2015 : Starting execution for request: test-invoke-request
Tue Sep 08 09:10:20 UTC 2015 : API Key: test-invoke-api-key
Tue Sep 08 09:10:20 UTC 2015 : Method request path: {name=name, width=100, height=100}
Tue Sep 08 09:10:20 UTC 2015 : Method request query string: {}
Tue Sep 08 09:10:20 UTC 2015 : Method request headers: {}
Tue Sep 08 09:10:20 UTC 2015 : Method request body before transformations: null
Tue Sep 08 09:10:20 UTC 2015 : Endpoint request URI: <endpoint>:function:Magic/invocations
Tue Sep 08 09:10:20 UTC 2015 : Endpoint request headers: {
    Authorization=<authorization> 
    Credential=<credential>, 
    SignedHeaders=accept;content-type;host;user-agent;x-amz-content-sha256;x-amz-date;x-amz-source-arn, 
    Signature=<signature>, 
    X-Amz-Date=20150908T091020Z, 
    X-Amz-Source-Arn=<ARN>/null/GET/image/{name}/{width}/{height}, 
    Accept=application/json, 
    User-Agent=AmazonAPIGateway_ebkkwbbpo0, 
    Host=lambda.us-east-1.amazonaws.com, 
    X-Amz-Content-Sha256=<key>, 
    Content-Type=application/json
}
Tue Sep 08 09:10:20 UTC 2015 : Endpoint request body after transformations: {
    "name": name,
    "width" : 100,
    "height" : 100,
    "params": {path={name=name, width=100, height=100}, querystring={}, header={}},
    "resourcePath": /image/{name}/{width}/{height},
}
Tue Sep 08 09:10:20 UTC 2015 : Endpoint response body before transformations: {"Type":"User","message":"Could not parse request body into json."}

Tue Sep 08 09:10:20 UTC 2015 : Endpoint response headers: {
    x-amzn-ErrorType=InvalidRequestContentException:http://internal.amazon.com/coral/com.amazonaws.awsgirapi/, 
    x-amzn-RequestId=<RequestId>, 
    Connection=keep-alive, 
    Content-Length=68, 
    Date=Tue, 08 Sep 2015 09:10:20 GMT, 
    Content-Type=application/json}
Tue Sep 08 09:10:20 UTC 2015 : Method response body after transformations: {"Type":"User","message":"Could not parse request body into json."}
Tue Sep 08 09:10:20 UTC 2015 : Method response headers: {Content-Type=application/json}
Tue Sep 08 09:10:20 UTC 2015 : Successfully completed execution

Answer 1

问题是集成请求映射模板。您应该在字符串类型的字段中加上双引号，这样以后就可以将它们转换为JSON。因此，在本例中，您应该这样写：

#set($inputRoot = $input.path('$'))
{
    "name": "$input.params('name')",
    "width" : $input.params('width'),
    "height" : $input.params('height'),
    "params": "$input.params()",
    "resourcePath": "$context.resourcePath",
}

我觉得很奇怪，但这就是解决办法。

此外，您不需要为此编写三个映射模板，您应该只保留application/json