git - Check Bitbucket login credentials inside shell script

Question

I'm currently writing a shell/bash script to automate a workflow. This bash script can clone projects and create new repo's on Bitbucket, do composer install/update's and more of that stuff.

My first plan was to do this all over SSH, but there are some situations that I need HTTPS. For all thinks that go's over HTTPS I need to check the user credentials for Bitbucket first. The credentials consisting of a username and password.

Is this possible. If so, how?

Answer 1

As you suggested in comments, curl can do HTTP Basic Auth for you. For BitBucket, the response will be 401 Unauthorized or 200 OK, depending on the validity of username/password pair. You could test the output (or only headers) with grep, but a little bit more robust approach would be to use the -w/--write-out option, combined with a HEAD request and -silenced output:

http_status=$(curl -X HEAD -s -w '%{http_code}' 
              -u "username:password" -H "Content-Type: application/json" 
              https://api.bitbucket.org/2.0/repositories/$repo_owner)

Then, to test the status, you can use a simple conditional expression:

if [[ $http_status == 200 ]]; then
    echo "Credentials valid"
else
    if [[ $http_status == 401 ]]; then
        echo "Credentials INVALID"
    else
        echo "Unexpected HTTP status code: $http_status"
    fi
fi

Or, if you plan on testing multiple status codes, you can use the case command, for example:

case $http_status in
    200) echo "Credentials valid";;
    301|302) echo "API endpoint changed";;
    401) echo "Credentials INVALID";;
    5*) echo "BitBucket Internal server error";;
    *) echo "Unexpected HTTP status code: $http_status";;
esac