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Methods to search for user accounts by email address in Firebase
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| /*************************************************** | |
| * Simple and elegant, no code complexity | |
| * Disadvantages: Requires warming all data into server memory (could take a long time for MBs of data or millions of records) | |
| * (This disadvantage should go away as we add optimizations to the core product) | |
| ***************************************************/ | |
| var fb = firebase.database.ref(); | |
| /** | |
| * @param {string} emailAddress | |
| * @return {Object} the object contains zero or more user records, the keys are the users' ids | |
| */ | |
| function findUsersMatchingEmail( emailAddress, callback ) { | |
| fb.child('user').orderByChild('emailAddress').equalTo(emailAddress).once('value', function(snap) { | |
| callback( snap.val() ); | |
| }); | |
| } |
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| /*************************************************** | |
| * Useful for MBs or more of data, or lists of thousands or more records | |
| * Disadvantages: Slight code complexity due to two queries (one for key, another for record); escaping emails is annoying | |
| ***************************************************/ | |
| var fb = firebase.database.ref(); | |
| /** | |
| * Looks up a user id by email address and invokes callback with the id or null if not found | |
| * @return {Object|null} the object contains the key/value hash for one user | |
| */ | |
| function getUserIdByEmail( emailAddress, callback ) { | |
| fb.child('emails_to_ids/'+emailToKey(emailAddress)).once('value', function(snap) { | |
| callback( snap.val() ); | |
| }); | |
| } | |
| /** | |
| * Creates a new user record and also updates the index | |
| */ | |
| function createNewUser( userRecord ) { | |
| var uid = fb.child('user').push().key(); | |
| // do a multi-path write! | |
| var mergedData = {}; | |
| mergedData['users/' + uid] = userRecord; | |
| mergedData['emails_to_ids/'+emailToKey(userRecord.email)] = uid; | |
| fb.update(mergedData); | |
| return id; | |
| } | |
| /** | |
| * Firebase keys cannot have a period (.) in them, so this converts the emails to valid keys | |
| */ | |
| function emailToKey(emailAddress) { | |
| return emailAddress.replace(/[.]/g, '%20'); | |
| } |
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