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August 29, 2015 14:08
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unwraps a url from shorteners. assumes request is available.
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| var unwrapUrl = function(input, callback) { | |
| var options = {}; | |
| if (typeof(input) === 'string') { | |
| options.url = input; | |
| } else if (typeof(input) === 'object') { | |
| options = input; | |
| } | |
| options._attempts = options._attempts || 0; | |
| options.maxAttempts = options.maxAttempts || 5; | |
| if (options._attempts > options.maxAttempts) { | |
| if (callback) { | |
| callback(new Error('Exceeded max redirect follow attempts (' + options.maxAttempts + ')')); | |
| return; | |
| } | |
| } | |
| request({ | |
| url: options.url, | |
| followRedirect: false | |
| }, function(err, response) { | |
| if (err) { | |
| var newErr = new Error("Error following redirects: " + err.message); | |
| newErr.innerError = err; | |
| if (callback) callback(newErr); | |
| } else { | |
| if (response.headers.location) { | |
| unwrapUrl({ | |
| url: response.headers.location, | |
| _attempts: options._attempts + 1, | |
| maxAttempts: options.maxAttempts | |
| }, callback); | |
| } else { | |
| if (callback) callback(null, options.url); | |
| } | |
| } | |
| }); | |
| }; |
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