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support Enforce signed requests #3

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4 changes: 3 additions & 1 deletion lib/passport-instagram/strategy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
* Module dependencies.
*/
var util = require('util')
, crypto = require('crypto')
, OAuth2Strategy = require('passport-oauth').OAuth2Strategy
, InternalOAuthError = require('passport-oauth').InternalOAuthError;

Expand Down Expand Up @@ -76,7 +77,8 @@ Strategy.prototype.userProfile = function(accessToken, done) {
// the internal node-oauth module will have to be modified to support
// exposing this information.

this._oauth2.get('https://api.instagram.com/v1/users/self', accessToken, function (err, body, res) {
var sig = crypto.createHmac('sha256', this._oauth2._clientSecret).update('/users/self|access_token=' + accessToken).digest('hex');
this._oauth2.get('https://api.instagram.com/v1/users/self?sig=' + sig, accessToken, function (err, body, res) {
if (err) { return done(new InternalOAuthError('failed to fetch user profile', err)); }

try {
Expand Down