{"id":131,"date":"2020-05-21T18:23:50","date_gmt":"2020-05-21T18:23:50","guid":{"rendered":"https:\/\/engy.us\/blog\/?p=131"},"modified":"2020-05-21T18:23:54","modified_gmt":"2020-05-21T18:23:54","slug":"aws-appsync-resolvers-finding-what-youve-got-in-context","status":"publish","type":"post","link":"https:\/\/engy.us\/blog\/2020\/05\/21\/aws-appsync-resolvers-finding-what-youve-got-in-context\/","title":{"rendered":"AWS AppSync Resolvers – Finding what you’ve got in context"},"content":{"rendered":"\n

When you write your own Resolvers for AWS AppSync, you are given a $context<\/code> object that contains a lot of helpful things<\/a>. In my case I needed to grab a unique ID associated with the user from the Cognito User Pool I set up. But the $ctx.identity.cognitoIdentityId<\/code> just wasn’t there. I needed to find out what I could<\/em> use there.<\/p>\n\n\n\n

Normally my response template looks like this:<\/p>\n\n\n\n

#if($ctx.error)\n    $utils.error($ctx.error.message, $ctx.error.type)\n#end\n\n$utils.toJson($utils.rds.toJsonObject($ctx.result)[1][0])<\/code><\/pre>\n\n\n\n
In my case it was telling me that a value was required. So I changed the template to spit out the whole context object instead of just the message:<\/p>\n\n\n\n
#if($ctx.error)\n    $utils.error($utils.toJson($ctx), $ctx.error.type)\n#end<\/code><\/pre>\n\n\n\n
Then I went to Queries and ran it again, this time getting the whole context spat out as the “error”. A trip through a JSON unescape tool<\/a> and formatting with the JSON Viewer Notepad++ plugin gave me a complete picture of what’s available.<\/p>\n\n\n\n
Turns out I need to use sub<\/code> or username<\/code>, and the cognitoIdentityId<\/code> field is nowhere to be found.<\/p>\n","protected":false},"excerpt":{"rendered":"
When you write your own Resolvers for AWS AppSync, you are given a $context object that contains a lot of helpful things. In my case I needed to grab a unique ID associated with the user from the Cognito User Pool I set up. But the $ctx.identity.cognitoIdentityId just wasn’t there. I needed to find out … <\/p>\n
Continue reading “AWS AppSync Resolvers – Finding what you’ve got in context”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pahBcK-27","jetpack-related-posts":[{"id":174,"url":"https:\/\/engy.us\/blog\/2021\/12\/11\/aws-cognito-authentication-in-electron\/","url_meta":{"origin":131,"position":0},"title":"AWS Cognito Authentication in Electron","date":"December 11, 2021","format":false,"excerpt":"The AWS Cognito authentication service as of this writing does not officially support the Electron platform. But there is a Javascript SDK for Cognito, as part of AWS Amplify. Others have tried using it on Electron but have run into issues. I ran into several more than what are described\u2026","rel":"","context":"Similar post","img":{"alt_text":"","src":"https:\/\/i2.wp.com\/engy.us\/blog\/wp-content\/uploads\/2021\/12\/image.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":165,"url":"https:\/\/engy.us\/blog\/2021\/10\/03\/efficient-svg-icons-in-web-components-with-webpack-and-svgo\/","url_meta":{"origin":131,"position":1},"title":"Efficient SVG icons in Web Components with Webpack and SVGO","date":"October 3, 2021","format":false,"excerpt":"So many ways to load them There are a lot of different ways to show an SVG on a webpage: , , ,