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<title>[11782] sites/trunk/common/includes: API: Add helpers for Slack and profiles.w.org.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/11782">11782</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/11782","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>iandunn</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2022-04-22 19:27:09 +0000 (Fri, 22 Apr 2022)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>API: Add helpers for Slack and profiles.w.org.</pre>
<h3>Added Paths</h3>
<ul>
<li>sites/trunk/common/includes/profiles/</li>
<li><a href="#sitestrunkcommonincludesprofilesprofilesphp">sites/trunk/common/includes/profiles/profiles.php</a></li>
<li><a href="#sitestrunkcommonincludesslackhelpersphp">sites/trunk/common/includes/slack/helpers.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="sitestrunkcommonincludesprofilesprofilesphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: sites/trunk/common/includes/profiles/profiles.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/common/includes/profiles/profiles.php (rev 0)
+++ sites/trunk/common/includes/profiles/profiles.php 2022-04-22 19:27:09 UTC (rev 11782)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,76 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+namespace Dotorg\Profiles;
+use Requests, Requests_Exception;
+
+const HANDLER_URL = 'https://profiles.wordpress.org/wp-admin/admin-ajax.php';
+
+/**
+ * Send requests to Profiles and handle errors.
+ *
+ * `$request_args` should match what the handler expects for a particular request. See
+ * `wporg-profiles-activity-handler.php` and `wporg-profiles-association-handler.php`.
+ */
+function post( array $request_args ) : string {
+ init_requests();
+
+ $headers = array();
+ $options = array();
+ $error = false;
+ $return = '';
+
+ // Requests to w.org sandbox should also use profiles.w.org sandbox, for testing end to end.
+ if ( defined( 'WPORG_SANDBOXED' ) && WPORG_SANDBOXED ) {
+ $url = str_replace( 'profiles.wordpress.org', '127.0.0.1', HANDLER_URL );
+ $headers['Host'] = 'profiles.wordpress.org';
+
+ // Sandboxes don't have valid certs. It's safe since we're only connecting to `127.0.0.1`.
+ $options['verify'] = false;
+
+ } else {
+ $url = HANDLER_URL;
+ }
+
+ try {
+ $response = Requests::post( $url, $headers, $request_args, $options );
+
+ if ( $response->success ) {
+ $return = $response->body;
+
+ } else {
+ $error = sprintf(
+ 'Request to %s failed with code %d and body: %s',
+ $url,
+ $response->status_code,
+ $response->body
+ );
+ }
+
+ } catch ( Requests_Exception $exception ) {
+ $error = sprintf(
+ 'Request to %s failed with code %d and message: %s',
+ $url,
+ $exception->getCode(),
+ $exception->getMessage()
+ );
+
+ $return = '-1 HTTP error';
+
+ } finally {
+ if ( $error ) {
+ trigger_error( $error, E_USER_WARNING );
+ }
+ }
+
+ return $return;
+}
+
+function init_requests() {
+ if ( class_exists( 'Requests' ) ) {
+ return;
+ }
+
+ require_once WPORGPATH . '/wp-includes/class-requests.php';
+ Requests::register_autoloader();
+ Requests::set_certificate_path( WPORGPATH . '/wp-includes/certificates/ca-bundle.crt' );
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: sites/trunk/common/includes/profiles/profiles.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="sitestrunkcommonincludesslackhelpersphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: sites/trunk/common/includes/slack/helpers.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/common/includes/slack/helpers.php (rev 0)
+++ sites/trunk/common/includes/slack/helpers.php 2022-04-22 19:27:09 UTC (rev 11782)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,71 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+namespace Dotorg\Slack;
+use Exception;
+
+/**
+ * Validate that a request from Slack is:
+ *
+ * - intended for our workspace
+ * - from the expected app
+ * - has a valid signature
+ */
+function is_valid_request( string $app_id, string $app_signing_secret, array $request_headers, string $raw_request_body ) : bool {
+ $parsed_request = json_decode( $raw_request_body );
+
+ $valid_signature = is_valid_request_signature(
+ $request_headers['X-Slack-Signature'] ?? '',
+ (int) $request_headers['X-Slack-Request-Timestamp'] ?? 0,
+ $raw_request_body,
+ $app_signing_secret
+ );
+
+ // Challenges shouldn't have events, so one that does is probably from a pentester.
+ // They won't include the app/team IDs, though.
+ if ( isset( $parsed_request->challenge ) && empty( $parsed_request->event ) ) {
+ $valid_request = $valid_signature;
+ } else {
+ $valid_request = WORDPRESSORG_TEAM_ID === $parsed_request->team_id &&
+ $app_id === $parsed_request->api_app_id &&
+ $valid_signature;
+ }
+
+ if ( $valid_request ) {
+ return true;
+ } else {
+ throw new Exception( 'Invalid request' );
+ }
+}
+
+/**
+ * Validate the signature of a request.
+ *
+ * Slack signs each request using a shared secret, so we need to verify that signing the message w/ our copy of
+ * the secret results in the same hash as theirs. If it doesn't, then the message has been tampered with.
+ *
+ * See https://api.slack.com/authentication/verifying-requests-from-slack
+ *
+ * `$request_body` must be the raw string, not the deserialized object.
+ */
+function is_valid_request_signature( string $user_signature, int $timestamp, string $request_body, string $signing_secret ) : bool {
+ $version = 'v0';
+ $delay_seconds = time() - $timestamp;
+
+ // Prevent replay attacks.
+ if ( $delay_seconds > 30 ) {
+ throw new Exception( 'Possible replay attack' );
+ }
+
+ $message = sprintf( '%s:%s:%s', $version, $timestamp, $request_body );
+ $authentic_signature = sprintf( '%s=%s', $version, hash_hmac( 'sha256', $message, $signing_secret ) );
+
+ if ( ! hash_equals( $authentic_signature, $user_signature ) ) {
+ /*
+ * It's not safe to include the details, because they all contain tokens. Even `$user_signature` might
+ * contain a valid one if there's a bug on our end.
+ */
+ throw new Exception( 'Invalid request signature' );
+ }
+
+ return true;
+}
</ins><span class="cx" style="display: block; padding: 0 10px">Property changes on: sites/trunk/common/includes/slack/helpers.php
</span><span class="cx" style="display: block; padding: 0 10px">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: svn:eol-style</h4></div>
<ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+native
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span></div>
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