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return and show in browser JSON parsing errors maybe caused by network problems

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server sends HTTP status "400 Bad Request" with JSON payload with "error" and "errno" attributes.
error is json_last_error_msg() prefixed with "JSON ".
Not yet implemented is resending the request (max. twice) for JSON parsing errors to try to work around network problems
This commit is contained in:
Ralf Becker 2018-11-01 11:59:31 +01:00
parent a635ac34b4
commit 2f1333a116
3 changed files with 46 additions and 12 deletions
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14
api/js/jsapi/egw_json.js
View File

@ -149,9 +149,19 @@ egw.extend('json', egw.MODULE_WND_LOCAL, function(_app, _wnd)
this.egw.message.call(this.egw, this.egw.lang('A request to the EGroupware server returned with an error')+': '+_xmlhttp.statusText+' ('+_xmlhttp.status+
")\n\n"+this.egw.lang('Please reload the EGroupware desktop (F5 / Cmd+r).')+"\n"+
this.egw.lang('If the error persists, contact your administrator for help and ask to check the error-log of the webserver.')+
"\n\nURL: "+this.url+"\n"+(_xmlhttp.getAllResponseHeaders() ? _xmlhttp.getAllResponseHeaders().match(/^Date:.*$/m)[0]:''));
"\n\nURL: "+this.url+"\n"+(_xmlhttp.getAllResponseHeaders() ? _xmlhttp.getAllResponseHeaders().match(/^Date:.*$/mi)[0]:'')+
// if EGroupware send JSON payload with error, errno show it here too
(_err === 'error' && _xmlhttp.status === 400 && typeof _xmlhttp.responseJSON === 'object' && _xmlhttp.responseJSON.error ?
"\nError: "+_xmlhttp.responseJSON.error+' ('+_xmlhttp.responseJSON.errno+')' : ''));
this.egw.debug('error', 'Ajax request to', this.url, ' failed: ', _err, _xmlhttp.status, _xmlhttp.statusText);
this.egw.debug('error', 'Ajax request to', this.url, ' failed: ', _err, _xmlhttp.status, _xmlhttp.statusText, _xmlhttp.responseJSON);
// check of unparsable JSON on server-side, which might be caused by some network problem --> resend max. twice
if (_err === 'error' && _xmlhttp.status === 400 && typeof _xmlhttp.responseJSON === 'object' &&
_xmlhttp.responseJSON.errno && _xmlhttp.responseJSON.error.substr(0, 5) === 'JSON ')
{
// ToDo: resend request max. twice
}
}
};

27
api/src/Json/Request.php
View File

@ -54,23 +54,36 @@ class Request
*
* @param string menuaction to call
* @param string $input_data is the RAW input data as it was received from the client
* @throws \InvalidArgumentException if JSON can not be parsed (json_last_error())
* or did not contain request[parameters] array (999)
*/
public function parseRequest($menuaction, $input_data)
{
// Remember that we currently are in a JSON request - e.g. used in the redirect code
self::$_hadJSONRequest = true;
if (get_magic_quotes_gpc()) $input_data = stripslashes($input_data);
$json_data = json_decode($input_data,true);
if (is_array($json_data) && isset($json_data['request']) && isset($json_data['request']['parameters']) && is_array($json_data['request']['parameters']))
// no or empty payload is eg. used by dynamicly loading tree nodes (uses just GET parameters)
if (!isset($input_data) || $input_data === '')
{
//error_log(__METHOD__.__LINE__.array2string($json_data['request']).function_backtrace());
$parameters =& $json_data['request']['parameters'];
$parameters = array();
}
else
{
$parameters = array();
if (get_magic_quotes_gpc()) $input_data = stripslashes($input_data);
if (($json_data = json_decode($input_data,true)) === null && json_last_error() !== JSON_ERROR_NONE)
{
throw new \InvalidArgumentException('JSON '.json_last_error_msg(), json_last_error());
}
elseif (is_array($json_data) && isset($json_data['request']) && isset($json_data['request']['parameters']) && is_array($json_data['request']['parameters']))
{
//error_log(__METHOD__.__LINE__.array2string($json_data['request']).function_backtrace());
$parameters =& $json_data['request']['parameters'];
}
else
{
throw new \InvalidArgumentException('Missing request:parameters object', 999);
}
}
// do we have a single request or an array of queued requests
if ($menuaction == 'api.queue')

17
json.php
View File

@ -70,8 +70,11 @@ function ajax_exception_handler($e)
// set our own exception handler, to not get the html from eGW's default one
set_exception_handler('ajax_exception_handler');
if (isset($_GET['menuaction']))
{
try {
if (!isset($_GET['menuaction']))
{
throw new InvalidArgumentException('Missing menuaction GET parameter', 998);
}
if (strpos($_GET['menuaction'],'::') !== false && strpos($_GET['menuaction'],'.') === false) // static method name app_something::method
{
@list($className,$functionName,$handler) = explode('::',$_GET['menuaction']);
@ -127,5 +130,13 @@ if (isset($_GET['menuaction']))
Json\Response::get();
exit();
}
// missing menuaction GET parameter or request:parameters object or unparsable JSON
catch (\InvalidArgumentException $e) {
if (isset($json)) $json->isJSONRequest(false); // no regular json request processing
throw new Json\Exception($_SERVER['PHP_SELF'] . ' Invalid AJAX JSON Request');
// give a proper HTTP status 400 Bad Request with some JSON payload explaining the problem
http_response_code(400);
header('Content-Type: application/json');
echo json_encode(array('error' => $e->getMessage(), 'errno' => $e->getCode()));
}
// other exceptions are handled by our ajax_exception_handler sending them back as alerts to client-side