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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.jboss.org/browse/AGDROID" style="color: #3b73af; text-decoration: none">AeroGear Android</a> / <a href="https://issues.jboss.org/browse/AGDROID-751" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-3f10607b-4c68-45a2-b92d-af6985731660" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom"></a> <a href="https://issues.jboss.org/browse/AGDROID-751" style="color: #3b73af; text-decoration: none">AGDROID-751</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.jboss.org/browse/AGDROID-751" style="color: #3b73af; text-decoration: none">dynamic load the public key in order to verify the token</a> </span> </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 13/Feb/18 10:19 AM </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> team-service-1 </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="weil" id="email_weil" href="https://issues.jboss.org/secure/ViewProfile.jspa?name=weil" style="color:#3b73af;; color: #3b73af; text-decoration: none">Wei Li</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0"><b>What</b></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We have implemented token integrity check as part of <a href="https://issues.jboss.org/browse/AGDROID-686" title="Implement a function to check the Integrity of the Identity/Access Token" class="issue-link" data-issue-key="AGDROID-686" style="color: #3b73af; text-decoration: none"><del>AGDROID-686</del></a>. The implementation is based on the assumption that the public key of the realm will be available from mobile-services.json file.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">However, based on the research and this SO issue (<a href="https://stackoverflow.com/questions/40503697/keycloak-missing-realm-public-key" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://stackoverflow.com/questions/40503697/keycloak-missing-realm-public-key</a>), it is not recommended to hard code the realm public key into the configuration file as the admin user could rotate it in KC to improve security. We need to add support for that.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0"><b>How</b></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The proposed approach is this:</p>
<ul>
<li>check there is a `realm-public-key` in the config file for keycloak. If there is, use it.</li>
<li>If there isn't such value, load it dynamically
<ul>
<li>first check if there is a cached version of the public key. If there is, check if the cached key is still valid (there should a configurable value to specify how long a public key can be valid locally)</li>
<li>If there is no such cached key, or if the cached key is invalid, load it from the backend (use '/openid-connect/cert' endpoint). Save it in the local cache.</li>
</ul> </li>
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