rengokantai/psbuiscaapiawsgatew

psbuiscaapiawsgatew

#####concept AWS API gateway settings->config per stage (reduce traffic, 0.5g-237g) #####grant user access ######create interpreting access policies

{
  "Version":"2012-10-17",
  "Statement":[
    {
      "Effect":"Allow",
      "Action":[
      "apigateway:GET",
      "apigateway:POST"
      ],
      "Resource":[
      ]
    }
  ]
}

format(resource)

arn:aws:apigateway:region::specifier   //more specific,
arn:aws:apigateway:region::api-id/stage-name/resource-path-specifier
arn:aws:apigateway:*::*:*  //anyresource ,any stage, any api, any aws region

#####using lambda first function

exports.handler = function(event,context){
    var input1 = (event.input1 === undefined?'k':event.input1);
     var input2 = (event.input2 === undefined?'e':event.input2);
     var response = input1+input2;
     context.done(null,{"response":response});
}

######basic policy create an IAM role, attach this policy

{
  "Version":"2012-10-17",
  "Statement":[
    {
      "Effect":"Allow",
      "Action":[
        "logs:CreateLogGroup",
        "logs:CreateLogStream",
        "logs:PutLogEvents"
      ],
      "Resource":"arn:aws:logs:*:*:*"
    }
  ]
}

invocation policy,as relationship policy

{
  "Statement":{
  "StatementId":"Id-1",
  "Action":"lambda:InvokeFunction",
  "Principal":"apigateway.amazonaws.com",
  "Sourcearn":"arn:aws:execute-api:apipath",
  "SourceAccount":"id"
}
}

#####build resource (name:api) go to api gateway, create resource add lambda function. test create new resource 's' select resource, actions->add method, select GET.
select (method response)
add response headers for 200,

Access-Control-Allow-Headers
Access-Control-Allow-Methods
Access-Control-Allow-Origin

select (Integration Response) arrow->Header Mappings

Access-Control-Allow-Headers -> 'Content-Type,X-Amz-Date,Authorzation'
Access-Control-Allow-Methods -> 'GET,POST'
Access-Control-Allow-Origin -> '*'

#####build second ######function

exports.handler = function(event,context){
    var o = {};
    o.id=event.id;
    o.name=(Math.floor(Math.random()*30)+10).toString();
    context.succeed(o);
}

go to api gateway, create resource add lambda function. test
create new resource 'o' select resource, actions->add method, select POST.
test: add body

{"id":1}

######Adding URL param

$context.apiId
$context.identity.accountOwner
$context.identity.sourceIp

$input.json(x)
$input.params()
$input.path(x)

Ex:

POST /x
{
"a":{
  "a1":"b1"
}
}

equalto

$input.path('$.a').size()

$util:using in mapping templates

$util.escapeJavascript()
$util.urlEncode()
$util.urlDecode()
$util.base64Encode()
$util.base64Decode()

Ex:

/o/{x}  -> {"id":"$input.params('x')"}

######building order map template create child resource under o.
resourcename:x
resourcepath: /o/{x} create new method GET,lambda function:b
Integration Request->add mapping templates,add

application/json ,template {"id":"$input.params('x')"}

Then test: type 1 to test ######deployment choose root->deploy api->[new stage]->name:stage
enable cloudwatch logs->loglevel:info,log full req/res,Enable CloudWatch Metrics
burstlimit=200 rate=500
donot forget to add cloudwatch arn to settting. see here ######postman Test s, using GET

https://z.us-east-1.amazonaws.com/stage/s

Test o using POST with body

https://z.us-east-1.amazonaws.com/stage/o

{"id":"1"}

or using curl: test post:

curl -XPOST https://z.us-east-1.amazonaws.com/stage/o -d '{"id":"1"}'

#####create api key

name:k, enabled,selectAPI:api stage:stage->add ######asso choose o/post(o/{x}/get), select method request->api key request:true

Test:
postman: test o/1, get, failed.
Add

x-api-key:xxxx  

to header. #####where ######publish to prod create a new stage prod,based on most recent deployment