Rss-Bridge/lib/Exceptions.php

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2013-08-11 13:30:41 +02:00
<?php
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/**
* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
* Atom feeds for websites that don't have one.
*
* For the full license information, please view the UNLICENSE file distributed
* with this source code.
*
* @package Core
* @license http://unlicense.org/ UNLICENSE
* @link https://github.com/rss-bridge/rss-bridge
*/
/**
* Implements a RSS-Bridge specific exception class
*
* @todo This class serves no purpose, remove it!
*/
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class HttpException extends \Exception{}
/**
* Returns an URL that automatically populates a new issue on GitHub based
* on the information provided
*
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* @param string $title string Sets the title of the issue
* @param string $body string Sets the body of the issue (GitHub markdown applies)
* @param string $labels mixed (optional) Specifies labels to add to the issue
* @param string $maintainer string (optional) Specifies the maintainer for the issue.
* The maintainer only applies if part of the development team!
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* @return string|null A qualified URL to a new issue with populated conent or null.
*
* @todo This function belongs inside a class
*/
function buildGitHubIssueQuery($title, $body, $labels = null, $maintainer = null){
if(!isset($title) || !isset($body) || empty($title) || empty($body)) {
return null;
}
// Add title and body
$uri = REPOSITORY
. 'issues/new?title='
. urlencode($title)
. '&body='
. urlencode($body);
// Add labels
if(!is_null($labels) && is_array($labels) && count($labels) > 0) {
if(count($lables) === 1) {
$uri .= '&labels=' . urlencode($labels[0]);
} else {
foreach($labels as $label) {
$uri .= '&labels[]=' . urlencode($label);
}
}
} elseif(!is_null($labels) && is_string($labels)) {
$uri .= '&labels=' . urlencode($labels);
}
// Add maintainer
if(!empty($maintainer)) {
$uri .= '&assignee=' . urlencode($maintainer);
}
return $uri;
}
/**
* Returns the exception message as HTML string
*
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* @param object $e Exception The exception to show
* @param object $bridge object The bridge object
* @return string|null Returns the exception as HTML string or null.
*
* @todo This function belongs inside a class
*/
function buildBridgeException($e, $bridge){
if(( !($e instanceof \Exception) && !($e instanceof \Error)) || !($bridge instanceof \BridgeInterface)) {
return null;
}
$title = $bridge->getName() . ' failed with error ' . $e->getCode();
// Build a GitHub compatible message
$body = 'Error message: `'
. $e->getMessage()
. "`\nQuery string: `"
. $_SERVER['QUERY_STRING']
. "`\nVersion: `"
. Configuration::getVersion()
. '`';
Return exceptions in requested feed formats (#841) * [Exceptions] Don't return header for bridge exceptions * [Exceptions] Add link to list in exception message This is an alternative when the button is not rendered for some reason. * [index] Don't return bridge exception for formats * [index] Return feed item for bridge exceptions * [BridgeAbstract] Rename 'getCacheTime' to 'getModifiedTime' * [BridgeAbstract] Move caching to index.php to separate concerns index.php needs more control over caching behavior in order to cache exceptions. This cannot be done in a bridge, as the bridge might be broken, thus preventing caching from working. This also (and more importantly) separates concerns. The bridge should not even care if caching is involved or not. Its purpose is to collect and provide data. Response times should be faster, as more complex bridge functions like 'setDatas' (evaluates all input parameters to predict the current context) and 'collectData' (collects data from sites) can be skipped entirely. Notice: In its current form, index.php takes care of caching. This could, however, be moved into a separate class (i.e. CacheAbstract) in order to make implementation details cache specific. * [index] Add '_error_time' parameter to $item['uri'] This ensures that error messages are recognized by feed readers as new errors after 24 hours. During that time the same item is returned no matter how often the cache is cleared. References https://github.com/RSS-Bridge/rss-bridge/issues/814#issuecomment-420876162 * [index] Include '_error_time' in the title for errors This prevents feed readers from "updating" feeds based on the title * [index] Handle "HTTP_IF_MODIFIED_SINCE" client requests Implementation is based on `BridgeAbstract::dieIfNotModified()`, introduced in 422c125d8e25b9ac5209580b1976fb5d75dab8f8 and simplified based on https://stackoverflow.com/a/10847262 Basically, before returning cached data we check if the client send the "HTTP_IF_MODIFIED_SINCE" header. If the modification time is more recent or equal to the cache time, we reply with "HTTP/1.1 304 Not Modified" (same as before). Otherwise send the cached data. * [index] Don't encode exception message with `htmlspecialchars` * [Exceptions] Include error message in exception * [index] Show different error message for error code 0
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$body_html = nl2br($body);
$link = buildGitHubIssueQuery($title, $body, 'bug report', $bridge->getMaintainer());
$header = buildHeader($e, $bridge);
Return exceptions in requested feed formats (#841) * [Exceptions] Don't return header for bridge exceptions * [Exceptions] Add link to list in exception message This is an alternative when the button is not rendered for some reason. * [index] Don't return bridge exception for formats * [index] Return feed item for bridge exceptions * [BridgeAbstract] Rename 'getCacheTime' to 'getModifiedTime' * [BridgeAbstract] Move caching to index.php to separate concerns index.php needs more control over caching behavior in order to cache exceptions. This cannot be done in a bridge, as the bridge might be broken, thus preventing caching from working. This also (and more importantly) separates concerns. The bridge should not even care if caching is involved or not. Its purpose is to collect and provide data. Response times should be faster, as more complex bridge functions like 'setDatas' (evaluates all input parameters to predict the current context) and 'collectData' (collects data from sites) can be skipped entirely. Notice: In its current form, index.php takes care of caching. This could, however, be moved into a separate class (i.e. CacheAbstract) in order to make implementation details cache specific. * [index] Add '_error_time' parameter to $item['uri'] This ensures that error messages are recognized by feed readers as new errors after 24 hours. During that time the same item is returned no matter how often the cache is cleared. References https://github.com/RSS-Bridge/rss-bridge/issues/814#issuecomment-420876162 * [index] Include '_error_time' in the title for errors This prevents feed readers from "updating" feeds based on the title * [index] Handle "HTTP_IF_MODIFIED_SINCE" client requests Implementation is based on `BridgeAbstract::dieIfNotModified()`, introduced in 422c125d8e25b9ac5209580b1976fb5d75dab8f8 and simplified based on https://stackoverflow.com/a/10847262 Basically, before returning cached data we check if the client send the "HTTP_IF_MODIFIED_SINCE" header. If the modification time is more recent or equal to the cache time, we reply with "HTTP/1.1 304 Not Modified" (same as before). Otherwise send the cached data. * [index] Don't encode exception message with `htmlspecialchars` * [Exceptions] Include error message in exception * [index] Show different error message for error code 0
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$message = <<<EOD
<strong>{$bridge->getName()}</strong> was unable to receive or process the
remote website's content!<br>
{$body_html}
EOD;
$section = buildSection($e, $bridge, $message, $link);
Return exceptions in requested feed formats (#841) * [Exceptions] Don't return header for bridge exceptions * [Exceptions] Add link to list in exception message This is an alternative when the button is not rendered for some reason. * [index] Don't return bridge exception for formats * [index] Return feed item for bridge exceptions * [BridgeAbstract] Rename 'getCacheTime' to 'getModifiedTime' * [BridgeAbstract] Move caching to index.php to separate concerns index.php needs more control over caching behavior in order to cache exceptions. This cannot be done in a bridge, as the bridge might be broken, thus preventing caching from working. This also (and more importantly) separates concerns. The bridge should not even care if caching is involved or not. Its purpose is to collect and provide data. Response times should be faster, as more complex bridge functions like 'setDatas' (evaluates all input parameters to predict the current context) and 'collectData' (collects data from sites) can be skipped entirely. Notice: In its current form, index.php takes care of caching. This could, however, be moved into a separate class (i.e. CacheAbstract) in order to make implementation details cache specific. * [index] Add '_error_time' parameter to $item['uri'] This ensures that error messages are recognized by feed readers as new errors after 24 hours. During that time the same item is returned no matter how often the cache is cleared. References https://github.com/RSS-Bridge/rss-bridge/issues/814#issuecomment-420876162 * [index] Include '_error_time' in the title for errors This prevents feed readers from "updating" feeds based on the title * [index] Handle "HTTP_IF_MODIFIED_SINCE" client requests Implementation is based on `BridgeAbstract::dieIfNotModified()`, introduced in 422c125d8e25b9ac5209580b1976fb5d75dab8f8 and simplified based on https://stackoverflow.com/a/10847262 Basically, before returning cached data we check if the client send the "HTTP_IF_MODIFIED_SINCE" header. If the modification time is more recent or equal to the cache time, we reply with "HTTP/1.1 304 Not Modified" (same as before). Otherwise send the cached data. * [index] Don't encode exception message with `htmlspecialchars` * [Exceptions] Include error message in exception * [index] Show different error message for error code 0
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return $section;
}
/**
* Returns the exception message as HTML string
*
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* @param object $e Exception The exception to show
* @param object $bridge object The bridge object
* @return string|null Returns the exception as HTML string or null.
*
* @todo This function belongs inside a class
*/
function buildTransformException($e, $bridge){
if(( !($e instanceof \Exception) && !($e instanceof \Error)) || !($bridge instanceof \BridgeInterface)) {
return null;
}
$title = $bridge->getName() . ' failed with error ' . $e->getCode();
// Build a GitHub compatible message
$body = 'Error message: `'
. $e->getMessage()
. "`\nQuery string: `"
. $_SERVER['QUERY_STRING'] . '`';
$link = buildGitHubIssueQuery($title, $body, 'bug report', $bridge->getMaintainer());
$header = buildHeader($e, $bridge);
$message = "RSS-Bridge was unable to transform the contents returned by
<strong>{$bridge->getName()}</strong>!";
$section = buildSection($e, $bridge, $message, $link);
return buildPage($title, $header, $section);
}
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/**
* Builds a new HTML header with data from a exception an a bridge
*
* @param object $e The exception object
* @param object $bridge The bridge object
* @return string The HTML header
*
* @todo This function belongs inside a class
*/
function buildHeader($e, $bridge){
return <<<EOD
<header>
<h1>Error {$e->getCode()}</h1>
<h2>{$e->getMessage()}</h2>
<p class="status">{$bridge->getName()}</p>
</header>
EOD;
}
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/**
* Builds a new HTML section
*
* @param object $e The exception object
* @param object $bridge The bridge object
* @param string $message The message to display
* @param string $link The link to include in the anchor
* @return string The HTML section
*
* @todo This function belongs inside a class
*/
function buildSection($e, $bridge, $message, $link){
return <<<EOD
<section>
<p class="exception-message">{$message}</p>
<div class="advice">
<ul class="advice">
<li>Press Return to check your input parameters</li>
<li>Press F5 to retry</li>
Return exceptions in requested feed formats (#841) * [Exceptions] Don't return header for bridge exceptions * [Exceptions] Add link to list in exception message This is an alternative when the button is not rendered for some reason. * [index] Don't return bridge exception for formats * [index] Return feed item for bridge exceptions * [BridgeAbstract] Rename 'getCacheTime' to 'getModifiedTime' * [BridgeAbstract] Move caching to index.php to separate concerns index.php needs more control over caching behavior in order to cache exceptions. This cannot be done in a bridge, as the bridge might be broken, thus preventing caching from working. This also (and more importantly) separates concerns. The bridge should not even care if caching is involved or not. Its purpose is to collect and provide data. Response times should be faster, as more complex bridge functions like 'setDatas' (evaluates all input parameters to predict the current context) and 'collectData' (collects data from sites) can be skipped entirely. Notice: In its current form, index.php takes care of caching. This could, however, be moved into a separate class (i.e. CacheAbstract) in order to make implementation details cache specific. * [index] Add '_error_time' parameter to $item['uri'] This ensures that error messages are recognized by feed readers as new errors after 24 hours. During that time the same item is returned no matter how often the cache is cleared. References https://github.com/RSS-Bridge/rss-bridge/issues/814#issuecomment-420876162 * [index] Include '_error_time' in the title for errors This prevents feed readers from "updating" feeds based on the title * [index] Handle "HTTP_IF_MODIFIED_SINCE" client requests Implementation is based on `BridgeAbstract::dieIfNotModified()`, introduced in 422c125d8e25b9ac5209580b1976fb5d75dab8f8 and simplified based on https://stackoverflow.com/a/10847262 Basically, before returning cached data we check if the client send the "HTTP_IF_MODIFIED_SINCE" header. If the modification time is more recent or equal to the cache time, we reply with "HTTP/1.1 304 Not Modified" (same as before). Otherwise send the cached data. * [index] Don't encode exception message with `htmlspecialchars` * [Exceptions] Include error message in exception * [index] Show different error message for error code 0
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<li>Open a <a href="{$link}">GitHub Issue</a> if this error persists</li>
</ul>
</div>
<a href="{$link}" title="After clicking this button you can review
the issue before submitting it"><button>Open GitHub Issue</button></a>
<p class="maintainer">{$bridge->getMaintainer()}</p>
</section>
EOD;
}
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/**
* Builds a new HTML page
*
* @param string $title The HTML title
* @param string $header The HTML header
* @param string $section The HTML section
* @return string The HTML page
*
* @todo This function belongs inside a class
*/
function buildPage($title, $header, $section){
return <<<EOD
<!DOCTYPE html>
<html lang="en">
<head>
<title>{$title}</title>
<link href="static/style.css" rel="stylesheet">
</head>
<body>
{$header}
{$section}
</body>
</html>
EOD;
}