From ecb80678161d0fa54b4bc2df4348864fc90518d0 Mon Sep 17 00:00:00 2001
From: David Anderson <davea@ssl.berkeley.edu>
Date: Sun, 16 Jul 2023 14:58:42 -0700
Subject: [PATCH] web: add "Share on Facebook" and "Share on Twitter" buttons
 to certificates. Thanks to Delizald on github.

---
 html/inc/cert.inc       | 27 +++++++++++++++++++++++++++
 html/user/cert1.php     | 26 +++++++++++++++++---------
 html/user/cert_all.php  | 26 +++++++++++++++++---------
 html/user/cert_team.php | 29 +++++++++++++++++++----------
 4 files changed, 80 insertions(+), 28 deletions(-)

diff --git a/html/inc/cert.inc b/html/inc/cert.inc
index ec807a782a..76d7328f8b 100644
--- a/html/inc/cert.inc
+++ b/html/inc/cert.inc
@@ -52,6 +52,7 @@ function credit_string($credit, $bolden) {
 }
 
 // show button to download certificate as PNG
+//
 function show_download_button() {
     echo '
         <p>
@@ -79,4 +80,30 @@ function show_download_button() {
         </script>
     ';
 }
+
+// show buttons to share certificate on facebook and twitter
+// Note: the cert pages don't use bootstrap, so we can't use show_button()
+//
+function show_share_buttons() {
+    echo '<p>';
+    $current_url = (empty($_SERVER['HTTPS']) ? 'http' : 'https') . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
+    $cert_url = urlencode($current_url);
+
+    // Share on Facebook
+    $fb_url = 'https://www.facebook.com/sharer/sharer.php?u='.$cert_url;
+    echo sprintf(
+        '<button onclick="window.location.href=\'%s\';">%s</button>',
+        $fb_url,
+        tra('Share on Facebook')
+    );
+    echo '<p>';
+
+    // Share on Twitter
+    $twitter_text = urlencode("Check out my computation certificate from BOINC!");
+    $tw_url = 'https://twitter.com/intent/tweet?url='.$cert_url.'&text='.$twitter_text;
+    echo sprintf('<button onclick="window.location.href=\'%s\';">%s</button>',
+        $tw_url,
+        tra('Share on Twitter')
+    );
+}
 ?>
diff --git a/html/user/cert1.php b/html/user/cert1.php
index 7f63cfa3c6..df73f1832b 100644
--- a/html/user/cert1.php
+++ b/html/user/cert1.php
@@ -23,21 +23,28 @@
 require_once("../inc/util.inc");
 require_once("../inc/cert.inc");
 
-check_get_args(array("border"));
-
-$user = get_logged_in_user();
-
-$join = gmdate('j F Y', $user->create_time);
-$today = gmdate('j F Y', time());
-
 $border = get_str("border", true);
-
 if ($border=="no") {
-    $border = 0;
+    $border=0;
 } else {
     $border=8;
 }
 
+// Make sure user_id is in the URL so that share functions work
+//
+$user_id = get_int('user_id', true);
+if (!$user_id) {
+    $user = get_logged_in_user();
+    Header(sprintf('Location: %s/cert1.php?user_id=%d%s',
+        url_base(), $user->id, $border==0?'&border=no':''
+    ));
+    exit;
+}
+$user = BoincUser::lookup_id($user_id);
+
+$join = gmdate('j F Y', $user->create_time);
+$today = gmdate('j F Y', time());
+
 $credit = credit_string($user->total_credit, false);
 
 $font = "\"Optima,Lucida Bright,Times New Roman\"";
@@ -100,4 +107,5 @@ echo "
 </td><tr></table></table>
 ";
 show_download_button();
+show_share_buttons();
 ?>
diff --git a/html/user/cert_all.php b/html/user/cert_all.php
index dc9374d1af..5d70a8eac6 100644
--- a/html/user/cert_all.php
+++ b/html/user/cert_all.php
@@ -24,21 +24,28 @@ require_once("../inc/util.inc");
 require_once("../inc/cert.inc");
 require_once("../inc/user.inc");
 
-check_get_args(array("border"));
-
-$user = get_logged_in_user();
-
-$join = gmdate('j F Y', $user->create_time);
-$today = gmdate('j F Y', time());
-
 $border = get_str("border", true);
-
 if ($border=="no") {
-    $border = 0;
+    $border=0;
 } else {
     $border=8;
 }
 
+// Make sure user_id is in the URL so that share functions work
+//
+$user_id = get_int('user_id', true);
+if (!$user_id) {
+    $user = get_logged_in_user();
+    Header(sprintf('Location: %s/cert_all.php?user_id=%d%s',
+        url_base(), $user->id, $border==0?'&border=no':''
+    ));
+    exit;
+}
+$user = BoincUser::lookup_id($user_id);
+
+$join = gmdate('j F Y', $user->create_time);
+$today = gmdate('j F Y', time());
+
 $font = "\"Optima,Lucida Bright,Times New Roman\"";
 
 $user = get_other_projects($user);
@@ -99,4 +106,5 @@ echo "
 </td><tr></table></table>
 ";
 show_download_button();
+show_share_buttons();
 ?>
diff --git a/html/user/cert_team.php b/html/user/cert_team.php
index b20ce57a5a..e22ef3d323 100644
--- a/html/user/cert_team.php
+++ b/html/user/cert_team.php
@@ -26,9 +26,25 @@ require_once("../inc/cert.inc");
 
 if (DISABLE_TEAMS) error_page("Teams are disabled");
 
-check_get_args(array("border"));
+$border = get_str("border", true);
+if ($border=="no") {
+    $border=0;
+} else {
+    $border=8;
+}
 
-$user = get_logged_in_user();
+// Make sure user_id is in the URL so that share functions work
+//
+$user_id = get_int('user_id', true);
+if (!$user_id) {
+    $user = get_logged_in_user();
+    Header(sprintf('Location: %s/cert_team.php?user_id=%d%s',
+        url_base(), $user->id, $border==0?'&border=no':''
+    ));
+    exit;
+}
+
+$user = BoincUser::lookup_id($user_id);
 $team = BoincTeam::lookup_id($user->teamid);
 if (!$team) error_page("no team");
 
@@ -37,14 +53,6 @@ $today = gmdate('j F Y', time());
 
 credit_to_ops($team->total_credit, $ops, $unit);
 
-$border = get_str("border", true);
-
-if ($border=="no") {
-    $border = 0;
-} else {
-    $border=8;
-}
-
 $credit = credit_string($team->total_credit, false);
 
 $font = "\"Optima,Lucida Bright,Times New Roman\"";
@@ -107,4 +115,5 @@ echo "
 </td><tr></table></table>
 ";
 show_download_button();
+show_share_buttons();
 ?>