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Code Issues Releases Wiki Activity

Move lingering "Aphront" classes to Phabricator

Browse source 
Summary: Ref T13395. Moves some Aphront classes from libphutil to Phabricator.

Test Plan: Grepped for symbols in libphutil and Arcanist.

Maniphest Tasks: T13395

Differential Revision: https://secure.phabricator.com/D20975
This commit is contained in:
epriestley 2020-02-12 11:45:41 -08:00
parent 2327578adc
commit af84f215f9
10 changed files with 1037 additions and 0 deletions
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16
src/__phutil_library_map__.php
View file

@ -224,6 +224,8 @@ phutil_register_library_map(array(
'AphrontFormView' => 'view/form/AphrontFormView.php',
'AphrontGlyphBarView' => 'view/widget/bars/AphrontGlyphBarView.php',
'AphrontHTMLResponse' => 'aphront/response/AphrontHTMLResponse.php',
'AphrontHTTPHeaderParser' => 'aphront/headerparser/AphrontHTTPHeaderParser.php',
'AphrontHTTPHeaderParserTestCase' => 'aphront/headerparser/__tests__/AphrontHTTPHeaderParserTestCase.php',
'AphrontHTTPParameterType' => 'aphront/httpparametertype/AphrontHTTPParameterType.php',
'AphrontHTTPProxyResponse' => 'aphront/response/AphrontHTTPProxyResponse.php',
'AphrontHTTPSink' => 'aphront/sink/AphrontHTTPSink.php',
@ -242,6 +244,9 @@ phutil_register_library_map(array(
'AphrontMalformedRequestException' => 'aphront/exception/AphrontMalformedRequestException.php',
'AphrontMoreView' => 'view/layout/AphrontMoreView.php',
'AphrontMultiColumnView' => 'view/layout/AphrontMultiColumnView.php',
'AphrontMultipartParser' => 'aphront/multipartparser/AphrontMultipartParser.php',
'AphrontMultipartParserTestCase' => 'aphront/multipartparser/__tests__/AphrontMultipartParserTestCase.php',
'AphrontMultipartPart' => 'aphront/multipartparser/AphrontMultipartPart.php',
'AphrontMySQLDatabaseConnection' => 'infrastructure/storage/connection/mysql/AphrontMySQLDatabaseConnection.php',
'AphrontMySQLDatabaseConnectionTestCase' => 'infrastructure/storage/__tests__/AphrontMySQLDatabaseConnectionTestCase.php',
'AphrontMySQLiDatabaseConnection' => 'infrastructure/storage/connection/mysql/AphrontMySQLiDatabaseConnection.php',
@ -265,12 +270,14 @@ phutil_register_library_map(array(
'AphrontReloadResponse' => 'aphront/response/AphrontReloadResponse.php',
'AphrontRequest' => 'aphront/AphrontRequest.php',
'AphrontRequestExceptionHandler' => 'aphront/handler/AphrontRequestExceptionHandler.php',
'AphrontRequestStream' => 'aphront/requeststream/AphrontRequestStream.php',
'AphrontRequestTestCase' => 'aphront/__tests__/AphrontRequestTestCase.php',
'AphrontResponse' => 'aphront/response/AphrontResponse.php',
'AphrontResponseProducerInterface' => 'aphront/interface/AphrontResponseProducerInterface.php',
'AphrontRoutingMap' => 'aphront/site/AphrontRoutingMap.php',
'AphrontRoutingResult' => 'aphront/site/AphrontRoutingResult.php',
'AphrontSchemaQueryException' => 'infrastructure/storage/exception/AphrontSchemaQueryException.php',
'AphrontScopedUnguardedWriteCapability' => 'aphront/writeguard/AphrontScopedUnguardedWriteCapability.php',
'AphrontSelectHTTPParameterType' => 'aphront/httpparametertype/AphrontSelectHTTPParameterType.php',
'AphrontSideNavFilterView' => 'view/layout/AphrontSideNavFilterView.php',
'AphrontSite' => 'aphront/site/AphrontSite.php',
@ -286,6 +293,7 @@ phutil_register_library_map(array(
'AphrontUserListHTTPParameterType' => 'aphront/httpparametertype/AphrontUserListHTTPParameterType.php',
'AphrontView' => 'view/AphrontView.php',
'AphrontWebpageResponse' => 'aphront/response/AphrontWebpageResponse.php',
'AphrontWriteGuard' => 'aphront/writeguard/AphrontWriteGuard.php',
'ArcanistConduitAPIMethod' => 'applications/arcanist/conduit/ArcanistConduitAPIMethod.php',
'AuditConduitAPIMethod' => 'applications/audit/conduit/AuditConduitAPIMethod.php',
'AuditQueryConduitAPIMethod' => 'applications/audit/conduit/AuditQueryConduitAPIMethod.php',
@ -6170,6 +6178,8 @@ phutil_register_library_map(array(
'AphrontFormView' => 'AphrontView',
'AphrontGlyphBarView' => 'AphrontBarView',
'AphrontHTMLResponse' => 'AphrontResponse',
'AphrontHTTPHeaderParser' => 'Phobject',
'AphrontHTTPHeaderParserTestCase' => 'PhutilTestCase',
'AphrontHTTPParameterType' => 'Phobject',
'AphrontHTTPProxyResponse' => 'AphrontResponse',
'AphrontHTTPSink' => 'Phobject',
@ -6188,6 +6198,9 @@ phutil_register_library_map(array(
'AphrontMalformedRequestException' => 'AphrontException',
'AphrontMoreView' => 'AphrontView',
'AphrontMultiColumnView' => 'AphrontView',
'AphrontMultipartParser' => 'Phobject',
'AphrontMultipartParserTestCase' => 'PhutilTestCase',
'AphrontMultipartPart' => 'Phobject',
'AphrontMySQLDatabaseConnection' => 'AphrontBaseMySQLDatabaseConnection',
'AphrontMySQLDatabaseConnectionTestCase' => 'PhabricatorTestCase',
'AphrontMySQLiDatabaseConnection' => 'AphrontBaseMySQLDatabaseConnection',
@ -6214,11 +6227,13 @@ phutil_register_library_map(array(
'AphrontReloadResponse' => 'AphrontRedirectResponse',
'AphrontRequest' => 'Phobject',
'AphrontRequestExceptionHandler' => 'Phobject',
'AphrontRequestStream' => 'Phobject',
'AphrontRequestTestCase' => 'PhabricatorTestCase',
'AphrontResponse' => 'Phobject',
'AphrontRoutingMap' => 'Phobject',
'AphrontRoutingResult' => 'Phobject',
'AphrontSchemaQueryException' => 'AphrontQueryException',
'AphrontScopedUnguardedWriteCapability' => 'Phobject',
'AphrontSelectHTTPParameterType' => 'AphrontHTTPParameterType',
'AphrontSideNavFilterView' => 'AphrontView',
'AphrontSite' => 'Phobject',
@ -6237,6 +6252,7 @@ phutil_register_library_map(array(
'PhutilSafeHTMLProducerInterface',
),
'AphrontWebpageResponse' => 'AphrontHTMLResponse',
'AphrontWriteGuard' => 'Phobject',
'ArcanistConduitAPIMethod' => 'ConduitAPIMethod',
'AuditConduitAPIMethod' => 'ConduitAPIMethod',
'AuditQueryConduitAPIMethod' => 'AuditConduitAPIMethod',

150
src/aphront/headerparser/AphrontHTTPHeaderParser.php Normal file
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@ -0,0 +1,150 @@
<?php
final class AphrontHTTPHeaderParser extends Phobject {
private $name;
private $content;
private $pairs;
public function parseRawHeader($raw_header) {
$this->name = null;
$this->content = null;
$parts = explode(':', $raw_header, 2);
$this->name = trim($parts[0]);
if (count($parts) > 1) {
$this->content = trim($parts[1]);
}
$this->pairs = null;
return $this;
}
public function getHeaderName() {
$this->requireParse();
return $this->name;
}
public function getHeaderContent() {
$this->requireParse();
return $this->content;
}
public function getHeaderContentAsPairs() {
$content = $this->getHeaderContent();
$state = 'prekey';
$length = strlen($content);
$pair_name = null;
$pair_value = null;
$pairs = array();
$ii = 0;
while ($ii < $length) {
$c = $content[$ii];
switch ($state) {
case 'prekey';
// We're eating space in front of a key.
if ($c == ' ') {
$ii++;
break;
}
$pair_name = '';
$state = 'key';
break;
case 'key';
// We're parsing a key name until we find "=" or ";".
if ($c == ';') {
$state = 'done';
break;
}
if ($c == '=') {
$ii++;
$state = 'value';
break;
}
$ii++;
$pair_name .= $c;
break;
case 'value':
// We found an "=", so now figure out if the value is quoted
// or not.
if ($c == '"') {
$ii++;
$state = 'quoted';
break;
}
$state = 'unquoted';
break;
case 'quoted':
// We're in a quoted string, parse until we find the closing quote.
if ($c == '"') {
$ii++;
$state = 'done';
break;
}
$ii++;
$pair_value .= $c;
break;
case 'unquoted':
// We're in an unquoted string, parse until we find a space or a
// semicolon.
if ($c == ' ' || $c == ';') {
$state = 'done';
break;
}
$ii++;
$pair_value .= $c;
break;
case 'done':
// We parsed something, so eat any trailing whitespace and semicolons
// and look for a new value.
if ($c == ' ' || $c == ';') {
$ii++;
break;
}
$pairs[] = array(
$pair_name,
$pair_value,
);
$pair_name = null;
$pair_value = null;
$state = 'prekey';
break;
}
}
if ($state == 'quoted') {
throw new Exception(
pht(
'Header has unterminated double quote for key "%s".',
$pair_name));
}
if ($pair_name !== null) {
$pairs[] = array(
$pair_name,
$pair_value,
);
}
return $pairs;
}
private function requireParse() {
if ($this->name === null) {
throw new PhutilInvalidStateException('parseRawHeader');
}
}
}

108
src/aphront/headerparser/__tests__/AphrontHTTPHeaderParserTestCase.php Normal file
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@ -0,0 +1,108 @@
<?php
final class AphrontHTTPHeaderParserTestCase extends PhutilTestCase {
public function testHeaderParser() {
$cases = array(
array(
'Key: x; y; z',
'Key',
'x; y; z',
array(
array('x', null),
array('y', null),
array('z', null),
),
),
array(
'Content-Disposition: form-data; name="label"',
'Content-Disposition',
'form-data; name="label"',
array(
array('form-data', null),
array('name', 'label'),
),
),
array(
'Content-Type: multipart/form-data; charset=utf-8',
'Content-Type',
'multipart/form-data; charset=utf-8',
array(
array('multipart/form-data', null),
array('charset', 'utf-8'),
),
),
array(
'Content-Type: application/octet-stream; charset="ut',
'Content-Type',
'application/octet-stream; charset="ut',
false,
),
array(
'Content-Type: multipart/form-data; boundary=ABCDEFG',
'Content-Type',
'multipart/form-data; boundary=ABCDEFG',
array(
array('multipart/form-data', null),
array('boundary', 'ABCDEFG'),
),
),
array(
'Content-Type: multipart/form-data; boundary="ABCDEFG"',
'Content-Type',
'multipart/form-data; boundary="ABCDEFG"',
array(
array('multipart/form-data', null),
array('boundary', 'ABCDEFG'),
),
),
);
foreach ($cases as $case) {
$input = $case[0];
$expect_name = $case[1];
$expect_content = $case[2];
$parser = id(new AphrontHTTPHeaderParser())
->parseRawHeader($input);
$actual_name = $parser->getHeaderName();
$actual_content = $parser->getHeaderContent();
$this->assertEqual(
$expect_name,
$actual_name,
pht('Header name for: %s', $input));
$this->assertEqual(
$expect_content,
$actual_content,
pht('Header content for: %s', $input));
if (isset($case[3])) {
$expect_pairs = $case[3];
$caught = null;
try {
$actual_pairs = $parser->getHeaderContentAsPairs();
} catch (Exception $ex) {
$caught = $ex;
}
if ($expect_pairs === false) {
$this->assertEqual(
true,
($caught instanceof Exception),
pht('Expect exception for header pairs of: %s', $input));
} else {
$this->assertEqual(
$expect_pairs,
$actual_pairs,
pht('Header pairs for: %s', $input));
}
}
}
}
}

249
src/aphront/multipartparser/AphrontMultipartParser.php Normal file
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@ -0,0 +1,249 @@
<?php
final class AphrontMultipartParser extends Phobject {
private $contentType;
private $boundary;
private $buffer;
private $body;
private $state;
private $part;
private $parts;
public function setContentType($content_type) {
$this->contentType = $content_type;
return $this;
}
public function getContentType() {
return $this->contentType;
}
public function beginParse() {
$content_type = $this->getContentType();
if ($content_type === null) {
throw new PhutilInvalidStateException('setContentType');
}
if (!preg_match('(^multipart/form-data)', $content_type)) {
throw new Exception(
pht(
'Expected "multipart/form-data" content type when executing a '.
'multipart body read.'));
}
$type_parts = preg_split('(\s*;\s*)', $content_type);
$boundary = null;
foreach ($type_parts as $type_part) {
$matches = null;
if (preg_match('(^boundary=(.*))', $type_part, $matches)) {
$boundary = $matches[1];
break;
}
}
if ($boundary === null) {
throw new Exception(
pht('Received "multipart/form-data" request with no "boundary".'));
}
$this->parts = array();
$this->part = null;
$this->buffer = '';
$this->boundary = $boundary;
// We're looking for a (usually empty) body before the first boundary.
$this->state = 'bodynewline';
}
public function continueParse($bytes) {
$this->buffer .= $bytes;
$continue = true;
while ($continue) {
switch ($this->state) {
case 'endboundary':
// We've just parsed a boundary. Next, we expect either "--" (which
// indicates we've reached the end of the parts) or "\r\n" (which
// indicates we should read the headers for the next part).
if (strlen($this->buffer) < 2) {
// We don't have enough bytes yet, so wait for more.
$continue = false;
break;
}
if (!strncmp($this->buffer, '--', 2)) {
// This is "--" after a boundary, so we're done. We'll read the
// rest of the body (the "epilogue") and discard it.
$this->buffer = substr($this->buffer, 2);
$this->state = 'epilogue';
$this->part = null;
break;
}
if (!strncmp($this->buffer, "\r\n", 2)) {
// This is "\r\n" after a boundary, so we're going to going to
// read the headers for a part.
$this->buffer = substr($this->buffer, 2);
$this->state = 'header';
// Create the object to hold the part we're about to read.
$part = new AphrontMultipartPart();
$this->parts[] = $part;
$this->part = $part;
break;
}
throw new Exception(
pht('Expected "\r\n" or "--" after multipart data boundary.'));
case 'header':
// We've just parsed a boundary, followed by "\r\n". We are going
// to read the headers for this part. They are in the form of HTTP
// headers and terminated by "\r\n". The section is terminated by
// a line with no header on it.
if (strlen($this->buffer) < 2) {
// We don't have enough data to find a "\r\n", so wait for more.
$continue = false;
break;
}
if (!strncmp("\r\n", $this->buffer, 2)) {
// This line immediately began "\r\n", so we're done with parsing
// headers. Start parsing the body.
$this->buffer = substr($this->buffer, 2);
$this->state = 'body';
break;
}
// This is an actual header, so look for the end of it.
$header_len = strpos($this->buffer, "\r\n");
if ($header_len === false) {
// We don't have a full header yet, so wait for more data.
$continue = false;
break;
}
$header_buf = substr($this->buffer, 0, $header_len);
$this->part->appendRawHeader($header_buf);
$this->buffer = substr($this->buffer, $header_len + 2);
break;
case 'body':
// We've parsed a boundary and headers, and are parsing the data for
// this part. The data is terminated by "\r\n--", then the boundary.
// We'll look for "\r\n", then switch to the "bodynewline" state if
// we find it.
$marker = "\r";
$marker_pos = strpos($this->buffer, $marker);
if ($marker_pos === false) {
// There's no "\r" anywhere in the buffer, so we can just read it
// as provided. Then, since we read all the data, we're done until
// we get more.
// Note that if we're in the preamble, we won't have a "part"
// object and will just discard the data.
if ($this->part) {
$this->part->appendData($this->buffer);
}
$this->buffer = '';
$continue = false;
break;
}
if ($marker_pos > 0) {
// If there are bytes before the "\r",
if ($this->part) {
$this->part->appendData(substr($this->buffer, 0, $marker_pos));
}
$this->buffer = substr($this->buffer, $marker_pos);
}
$expect = "\r\n";
$expect_len = strlen($expect);
if (strlen($this->buffer) < $expect_len) {
// We don't have enough bytes yet to know if this is "\r\n"
// or not.
$continue = false;
break;
}
if (strncmp($this->buffer, $expect, $expect_len)) {
// The next two bytes aren't "\r\n", so eat them and go looking
// for more newlines.
if ($this->part) {
$this->part->appendData(substr($this->buffer, 0, $expect_len));
}
$this->buffer = substr($this->buffer, $expect_len);
break;
}
// Eat the "\r\n".
$this->buffer = substr($this->buffer, $expect_len);
$this->state = 'bodynewline';
break;
case 'bodynewline':
// We've parsed a newline in a body, or we just started parsing the
// request. In either case, we're looking for "--", then the boundary.
// If we find it, this section is done. If we don't, we consume the
// bytes and move on.
$expect = '--'.$this->boundary;
$expect_len = strlen($expect);
if (strlen($this->buffer) < $expect_len) {
// We don't have enough bytes yet, so wait for more.
$continue = false;
break;
}
if (strncmp($this->buffer, $expect, $expect_len)) {
// This wasn't the boundary, so return to the "body" state and
// consume it. (But first, we need to append the "\r\n" which we
// ate earlier.)
if ($this->part) {
$this->part->appendData("\r\n");
}
$this->state = 'body';
break;
}
// This is the boundary, so toss it and move on.
$this->buffer = substr($this->buffer, $expect_len);
$this->state = 'endboundary';
break;
case 'epilogue':
// We just discard any epilogue.
$this->buffer = '';
$continue = false;
break;
default:
throw new Exception(
pht(
'Unknown parser state "%s".\n',
$this->state));
}
}
}
public function endParse() {
if ($this->state !== 'epilogue') {
throw new Exception(
pht(
'Expected "multipart/form-data" parse to end '.
'in state "epilogue".'));
}
return $this->parts;
}
}

96
src/aphront/multipartparser/AphrontMultipartPart.php Normal file
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@ -0,0 +1,96 @@
<?php
final class AphrontMultipartPart extends Phobject {
private $headers = array();
private $value = '';
private $name;
private $filename;
private $tempFile;
private $byteSize = 0;
public function appendRawHeader($bytes) {
$parser = id(new AphrontHTTPHeaderParser())
->parseRawHeader($bytes);
$header_name = $parser->getHeaderName();
$this->headers[] = array(
$header_name,
$parser->getHeaderContent(),
);
if (strtolower($header_name) === 'content-disposition') {
$pairs = $parser->getHeaderContentAsPairs();
foreach ($pairs as $pair) {
list($key, $value) = $pair;
switch ($key) {
case 'filename':
$this->filename = $value;
break;
case 'name':
$this->name = $value;
break;
}
}
}
return $this;
}
public function appendData($bytes) {
$this->byteSize += strlen($bytes);
if ($this->isVariable()) {
$this->value .= $bytes;
} else {
if (!$this->tempFile) {
$this->tempFile = new TempFile(getmypid().'.upload');
}
Filesystem::appendFile($this->tempFile, $bytes);
}
return $this;
}
public function isVariable() {
return ($this->filename === null);
}
public function getName() {
return $this->name;
}
public function getVariableValue() {
if (!$this->isVariable()) {
throw new Exception(pht('This part is not a variable!'));
}
return $this->value;
}
public function getPHPFileDictionary() {
if (!$this->tempFile) {
$this->appendData('');
}
$mime_type = 'application/octet-stream';
foreach ($this->headers as $header) {
list($name, $value) = $header;
if (strtolower($name) == 'content-type') {
$mime_type = $value;
break;
}
}
return array(
'name' => $this->filename,
'type' => $mime_type,
'tmp_name' => (string)$this->tempFile,
'error' => 0,
'size' => $this->byteSize,
);
}
}

45
src/aphront/multipartparser/__tests__/AphrontMultipartParserTestCase.php Normal file
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@ -0,0 +1,45 @@
<?php
final class AphrontMultipartParserTestCase extends PhutilTestCase {
public function testParser() {
$map = array(
array(
'data' => 'simple.txt',
'variables' => array(
array('a', 'b'),
),
),
);
$data_dir = dirname(__FILE__).'/data/';
foreach ($map as $test_case) {
$data = Filesystem::readFile($data_dir.$test_case['data']);
$data = str_replace("\n", "\r\n", $data);
$parser = id(new AphrontMultipartParser())
->setContentType('multipart/form-data; boundary=ABCDEFG');
$parser->beginParse();
$parser->continueParse($data);
$parts = $parser->endParse();
$variables = array();
foreach ($parts as $part) {
if (!$part->isVariable()) {
continue;
}
$variables[] = array(
$part->getName(),
$part->getVariableValue(),
);
}
$expect_variables = idx($test_case, 'variables', array());
$this->assertEqual($expect_variables, $variables);
}
}
}

5
src/aphront/multipartparser/__tests__/data/simple.txt Normal file
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@ -0,0 +1,5 @@
--ABCDEFG
Content-Disposition: form-data; name="a"
b
--ABCDEFG--

92
src/aphront/requeststream/AphrontRequestStream.php Normal file
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@ -0,0 +1,92 @@
<?php
final class AphrontRequestStream extends Phobject {
private $encoding;
private $stream;
private $closed;
private $iterator;
public function setEncoding($encoding) {
$this->encoding = $encoding;
return $this;
}
public function getEncoding() {
return $this->encoding;
}
public function getIterator() {
if (!$this->iterator) {
$this->iterator = new PhutilStreamIterator($this->getStream());
}
return $this->iterator;
}
public function readData() {
if (!$this->iterator) {
$iterator = $this->getIterator();
$iterator->rewind();
} else {
$iterator = $this->getIterator();
}
if (!$iterator->valid()) {
return null;
}
$data = $iterator->current();
$iterator->next();
return $data;
}
private function getStream() {
if (!$this->stream) {
$this->stream = $this->newStream();
}
return $this->stream;
}
private function newStream() {
$stream = fopen('php://input', 'rb');
if (!$stream) {
throw new Exception(
pht(
'Failed to open stream "%s" for reading.',
'php://input'));
}
$encoding = $this->getEncoding();
if ($encoding === 'gzip') {
// This parameter is magic. Values 0-15 express a time/memory tradeoff,
// but the largest value (15) corresponds to only 32KB of memory and
// data encoded with a smaller window size than the one we pass can not
// be decompressed. Always pass the maximum window size.
// Additionally, you can add 16 (to enable gzip) or 32 (to enable both
// gzip and zlib). Add 32 to support both.
$zlib_window = 15 + 32;
$ok = stream_filter_append(
$stream,
'zlib.inflate',
STREAM_FILTER_READ,
array(
'window' => $zlib_window,
));
if (!$ok) {
throw new Exception(
pht(
'Failed to append filter "%s" to input stream while processing '.
'a request with "%s" encoding.',
'zlib.inflate',
$encoding));
}
}
return $stream;
}
}

9
src/aphront/writeguard/AphrontScopedUnguardedWriteCapability.php Normal file
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@ -0,0 +1,9 @@
<?php
final class AphrontScopedUnguardedWriteCapability extends Phobject {
public function __destruct() {
AphrontWriteGuard::endUnguardedWrites();
}
}

267
src/aphront/writeguard/AphrontWriteGuard.php Normal file
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@ -0,0 +1,267 @@
<?php
/**
* Guard writes against CSRF. The Aphront structure takes care of most of this
* for you, you just need to call:
*
* AphrontWriteGuard::willWrite();
*
* ...before executing a write against any new kind of storage engine. MySQL
* databases and the default file storage engines are already covered, but if
* you introduce new types of datastores make sure their writes are guarded. If
* you don't guard writes and make a mistake doing CSRF checks in a controller,
* a CSRF vulnerability can escape undetected.
*
* If you need to execute writes on a page which doesn't have CSRF tokens (for
* example, because you need to do logging), you can temporarily disable the
* write guard by calling:
*
* AphrontWriteGuard::beginUnguardedWrites();
* do_logging_write();
* AphrontWriteGuard::endUnguardedWrites();
*
* This is dangerous, because it disables the backup layer of CSRF protection
* this class provides. You should need this only very, very rarely.
*
* @task protect Protecting Writes
* @task disable Disabling Protection
* @task manage Managing Write Guards
* @task internal Internals
*/
final class AphrontWriteGuard extends Phobject {
private static $instance;
private static $allowUnguardedWrites = false;
private $callback;
private $allowDepth = 0;
/* -( Managing Write Guards )---------------------------------------------- */
/**
* Construct a new write guard for a request. Only one write guard may be
* active at a time. You must explicitly call @{method:dispose} when you are
* done with a write guard:
*
* $guard = new AphrontWriteGuard($callback);
* // ...
* $guard->dispose();
*
* Normally, you do not need to manage guards yourself -- the Aphront stack
* handles it for you.
*
* This class accepts a callback, which will be invoked when a write is
* attempted. The callback should validate the presence of a CSRF token in
* the request, or abort the request (e.g., by throwing an exception) if a
* valid token isn't present.
*
* @param callable CSRF callback.
* @return this
* @task manage
*/
public function __construct($callback) {
if (self::$instance) {
throw new Exception(
pht(
'An %s already exists. Dispose of the previous guard '.
'before creating a new one.',
__CLASS__));
}
if (self::$allowUnguardedWrites) {
throw new Exception(
pht(
'An %s is being created in a context which permits '.
'unguarded writes unconditionally. This is not allowed and '.
'indicates a serious error.',
__CLASS__));
}
$this->callback = $callback;
self::$instance = $this;
}
/**
* Dispose of the active write guard. You must call this method when you are
* done with a write guard. You do not normally need to call this yourself.
*
* @return void
* @task manage
*/
public function dispose() {
if (!self::$instance) {
throw new Exception(pht(
'Attempting to dispose of write guard, but no write guard is active!'));
}
if ($this->allowDepth > 0) {
throw new Exception(
pht(
'Imbalanced %s: more %s calls than %s calls.',
__CLASS__,
'beginUnguardedWrites()',
'endUnguardedWrites()'));
}
self::$instance = null;
}
/**
* Determine if there is an active write guard.
*
* @return bool
* @task manage
*/
public static function isGuardActive() {
return (bool)self::$instance;
}
/**
* Return on instance of AphrontWriteGuard if it's active, or null
*
* @return AphrontWriteGuard|null
*/
public static function getInstance() {
return self::$instance;
}
/* -( Protecting Writes )-------------------------------------------------- */
/**
* Declare intention to perform a write, validating that writes are allowed.
* You should call this method before executing a write whenever you implement
* a new storage engine where information can be permanently kept.
*
* Writes are permitted if:
*
* - The request has valid CSRF tokens.
* - Unguarded writes have been temporarily enabled by a call to
* @{method:beginUnguardedWrites}.
* - All write guarding has been disabled with
* @{method:allowDangerousUnguardedWrites}.
*
* If none of these conditions are true, this method will throw and prevent
* the write.
*
* @return void
* @task protect
*/
public static function willWrite() {
if (!self::$instance) {
if (!self::$allowUnguardedWrites) {
throw new Exception(
pht(
'Unguarded write! There must be an active %s to perform writes.',
__CLASS__));
} else {
// Unguarded writes are being allowed unconditionally.
return;
}
}
$instance = self::$instance;
if ($instance->allowDepth == 0) {
call_user_func($instance->callback);
}
}
/* -( Disabling Write Protection )----------------------------------------- */
/**
* Enter a scope which permits unguarded writes. This works like
* @{method:beginUnguardedWrites} but returns an object which will end
* the unguarded write scope when its __destruct() method is called. This
* is useful to more easily handle exceptions correctly in unguarded write
* blocks:
*
* // Restores the guard even if do_logging() throws.
* function unguarded_scope() {
* $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
* do_logging();
* }
*
* @return AphrontScopedUnguardedWriteCapability Object which ends unguarded
* writes when it leaves scope.
* @task disable
*/
public static function beginScopedUnguardedWrites() {
self::beginUnguardedWrites();
return new AphrontScopedUnguardedWriteCapability();
}
/**
* Begin a block which permits unguarded writes. You should use this very
* sparingly, and only for things like logging where CSRF is not a concern.
*
* You must pair every call to @{method:beginUnguardedWrites} with a call to
* @{method:endUnguardedWrites}:
*
* AphrontWriteGuard::beginUnguardedWrites();
* do_logging();
* AphrontWriteGuard::endUnguardedWrites();
*
* @return void
* @task disable
*/
public static function beginUnguardedWrites() {
if (!self::$instance) {
return;
}
self::$instance->allowDepth++;
}
/**
* Declare that you have finished performing unguarded writes. You must
* call this exactly once for each call to @{method:beginUnguardedWrites}.
*
* @return void
* @task disable
*/
public static function endUnguardedWrites() {
if (!self::$instance) {
return;
}
if (self::$instance->allowDepth <= 0) {
throw new Exception(
pht(
'Imbalanced %s: more %s calls than %s calls.',
__CLASS__,
'endUnguardedWrites()',
'beginUnguardedWrites()'));
}
self::$instance->allowDepth--;
}
/**
* Allow execution of unguarded writes. This is ONLY appropriate for use in
* script contexts or other contexts where you are guaranteed to never be
* vulnerable to CSRF concerns. Calling this method is EXTREMELY DANGEROUS
* if you do not understand the consequences.
*
* If you need to perform unguarded writes on an otherwise guarded workflow
* which is vulnerable to CSRF, use @{method:beginUnguardedWrites}.
*
* @return void
* @task disable
*/
public static function allowDangerousUnguardedWrites($allow) {
if (self::$instance) {
throw new Exception(
pht(
'You can not unconditionally disable %s by calling %s while a write '.
'guard is active. Use %s to temporarily allow unguarded writes.',
__CLASS__,
__FUNCTION__.'()',
'beginUnguardedWrites()'));
}
self::$allowUnguardedWrites = true;
}
}