Password hashing and encoding

Service to support requesting a password hash that can be retrieved on a separate http call.

Getting Started

Get the source with go get github.com/jakepearson/jcpassword
Run the service with go build main.go && main or go run main.go
- The service should now be running on your machine. The endpoints are defined below.
To override the default port of 8080, set the PORT environment variable
All commits trigger a build job on CircleCI
If all tests pass, the source is pushed to Heroku for deployment to the production instance (https://jakepearson-password.herokuapp.com/)
Run the tests with go test ./...

/hash (POST): Request that a string is hashed with SHA512 and base64 encoded. To use, call to the endpoint with a body of the format password=<your-password>A HashID is returned that can be used to lookup the final result.
/hash/<HashID> (GET): Request for the final result of the hash and encode operation. If the operation is complete, a status code of 200 will be returned with the hashed and encoded string in the body of the response. If the operation is not yet complete, a status code of 400 (Bad request) will return with a message.
/shutdown (GET): Request for the service to shutdown. The service will stop accepting requests, complete any open requests, and finally shutdown the process after 5 seconds.
/metrics (GET): Request for simple metrics about the service. Returns a json string with fields for total and average in milliseconds.

Change /hash endpoint to return the full url or uri to get the hash instead of just an id
Replace in memory hash database with a DB that can survive restarts. We could then run multiple service instances and do rolling deploys
Replace homegrown metrics system with something like Prometheus
Switch from Heroku logging to a different SaaS service with better performance and search capabilities
Render output into JUnit format in CircleCI
Implement a Swagger document and UI to make the service easier to discover and understand