Tips & Tricks

Authenticate with Wut.Dev from a CLI Alias

Wut.Dev has a page, /auth, which accepts the URL parameter ?auth= containing base64-encoded JSON credential payload (the output of aws sts assume-role). You can create a local CLI alias to make re-authenticating super simple.

Be sure to replace AccountId in the command below.

alias wut-auth='open "http://wut.dev/auth?auth=$(aws sts assume-role --role-arn arn:aws:iam::{AccountId}:role/WutDotDev-Mgmt --role-session-name WutDotDev --output json --policy '\''{"Version": "2012-10-17","Statement": {"Effect": "Allow","Action": "*","Resource": "*","Condition": {"IpAddress": {"aws:SourceIp": "'\''$(curl -s http://checkip.amazonaws.com)'\''"}}}}'\'' | base64)"'

The above command:

Assumes the WutDotDev-Mgmt role
Passes a session policy locking the credentials to your IP address
Converts the output to base64
Passes this to the /auth?auth= Wut.Dev endpoint

You can then save the credentials and use Wut.Dev.

Send Errors from the CLI to Wut.Dev

If you are getting an error with an AWS command, like the following:

$ aws ecr create-repository --repository-name project-a/nginx-web-app

An error occurred (AccessDeniedException) when calling the CreateRepository operation: User: arn:aws:iam::123456789101:user/example is not authorized to perform: ecr:CreateRepository on resource: arn:aws:ecr:us-east-1:123456789101:repository/project-a/nginx-web-app because no permissions boundary allows the ecr:CreateRepository action

You can create a bash alias to pipe the error directly to Wut.Dev’s /error page.

Open ~/.bash_profile and add:

# Function to open wut with a search query
wut() {
    local query
    # Read from stdin if input is piped
    if [ -p /dev/stdin ]; then
        query=$(cat -)
    else
        query=$1
    fi
    # Open the URL in the default web browser
    open "https://wut.dev/error?error=$query"
}

# Alias to use the function
alias wut=wut

Then, you can re-run commands like the above, piping the error to wut:

aws ecr create-repository --repository-name project-a/nginx-web-app 2>&1 | wut