AddSignup adds a signup with the given verification code to the datastore, returning the key of the newly created entity.

AddSite adds a site with the given verification code to the datastore, returning the key of the newly created entity.

CheckErr is a utility function for killing the app on the event of a non-nil error.

ComposeVerificationEmail builds the verification email, ready to be sent.

CreateHandler creates my mux.Router.

CreateSignupEndpoint handles POST /signup/{email}.

EmailVerificationCode composes and sends a verification code email.

Given a code, return the datastore key and signup.

GetSignupCode gets the signup code matching the given email address.

Given a code, return the datastore key and signup.

IsCodeAvailable checks the database to see if a code is unique (true)/already used (false).

IsSignupVerified checks the database to see if an email address exits and is verified.

IsSignupVerifiedEndpoint handles GET /signup/{email}.

MarkVerified marks the signup as verified with the given ID.

RandToken generates a random token, for use in verification codes.

VerifyCodeEndpoint handles GET /verify/{code}.

Config : the configuration file format.

Email holds our JSON response for GET and POST /signup/{email}.

Signup is used to hold signup entries going into/coming out of the datastore.

Site : stores each site we verify emails for.

Verification holds our JSON response for GET /verify/{code}.