Source code

Revision control

Other Tools

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsAboutCacheEntry.h"
#include "mozilla/Sprintf.h"
#include "nsAboutCache.h"
#include "nsICacheStorage.h"
#include "CacheObserver.h"
#include "nsNetUtil.h"
#include "nsEscape.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsIPipe.h"
#include "nsAboutProtocolUtils.h"
#include "nsContentUtils.h"
#include "nsInputStreamPump.h"
#include "CacheFileUtils.h"
#include <algorithm>
using namespace mozilla::net;
#define HEXDUMP_MAX_ROWS 16
static void HexDump(uint32_t* state, const char* buf, int32_t n,
nsCString& result) {
char temp[16];
const unsigned char* p;
while (n) {
SprintfLiteral(temp, "%08x: ", *state);
result.Append(temp);
*state += HEXDUMP_MAX_ROWS;
p = (const unsigned char*)buf;
int32_t i, row_max = std::min(HEXDUMP_MAX_ROWS, n);
// print hex codes:
for (i = 0; i < row_max; ++i) {
SprintfLiteral(temp, "%02x ", *p++);
result.Append(temp);
}
for (i = row_max; i < HEXDUMP_MAX_ROWS; ++i) {
result.AppendLiteral(" ");
}
// print ASCII glyphs if possible:
p = (const unsigned char*)buf;
for (i = 0; i < row_max; ++i, ++p) {
switch (*p) {
case '<':
result.AppendLiteral("&lt;");
break;
case '>':
result.AppendLiteral("&gt;");
break;
case '&':
result.AppendLiteral("&amp;");
break;
default:
if (*p < 0x7F && *p > 0x1F) {
result.Append(*p);
} else {
result.Append('.');
}
}
}
result.Append('\n');
buf += row_max;
n -= row_max;
}
}
//-----------------------------------------------------------------------------
// nsAboutCacheEntry::nsISupports
NS_IMPL_ISUPPORTS(nsAboutCacheEntry, nsIAboutModule)
NS_IMPL_ISUPPORTS(nsAboutCacheEntry::Channel, nsICacheEntryOpenCallback,
nsICacheEntryMetaDataVisitor, nsIStreamListener, nsIRequest,
nsIChannel)
//-----------------------------------------------------------------------------
// nsAboutCacheEntry::nsIAboutModule
NS_IMETHODIMP
nsAboutCacheEntry::NewChannel(nsIURI* uri, nsILoadInfo* aLoadInfo,
nsIChannel** result) {
NS_ENSURE_ARG_POINTER(uri);
nsresult rv;
RefPtr<Channel> channel = new Channel();
rv = channel->Init(uri, aLoadInfo);
if (NS_FAILED(rv)) return rv;
channel.forget(result);
return NS_OK;
}
NS_IMETHODIMP
nsAboutCacheEntry::GetURIFlags(nsIURI* aURI, uint32_t* result) {
*result = nsIAboutModule::HIDE_FROM_ABOUTABOUT |
nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT;
return NS_OK;
}
NS_IMETHODIMP
nsAboutCacheEntry::GetChromeURI(nsIURI* aURI, nsIURI** chromeURI) {
return NS_ERROR_ILLEGAL_VALUE;
}
//-----------------------------------------------------------------------------
// nsAboutCacheEntry::Channel
nsresult nsAboutCacheEntry::Channel::Init(nsIURI* uri, nsILoadInfo* aLoadInfo) {
nsresult rv;
nsCOMPtr<nsIInputStream> stream;
rv = GetContentStream(uri, getter_AddRefs(stream));
if (NS_FAILED(rv)) return rv;
rv = NS_NewInputStreamChannelInternal(getter_AddRefs(mChannel), uri,
stream.forget(), "text/html"_ns,
"utf-8"_ns, aLoadInfo);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult nsAboutCacheEntry::Channel::GetContentStream(nsIURI* uri,
nsIInputStream** result) {
nsresult rv;
// Init: (block size, maximum length)
nsCOMPtr<nsIAsyncInputStream> inputStream;
rv = NS_NewPipe2(getter_AddRefs(inputStream), getter_AddRefs(mOutputStream),
true, false, 256, UINT32_MAX);
if (NS_FAILED(rv)) return rv;
constexpr auto buffer =
"<!DOCTYPE html>\n"
"<html>\n"
"<head>\n"
" <meta http-equiv=\"Content-Security-Policy\" content=\"default-src "
"chrome:; object-src 'none'\" />\n"
" <meta name=\"color-scheme\" content=\"light dark\" />\n"
" <title>Cache entry information</title>\n"
" <link rel=\"stylesheet\" "
"type=\"text/css\"/>\n"
" <link rel=\"stylesheet\" "
"href=\"chrome://global/skin/aboutCacheEntry.css\" type=\"text/css\"/>\n"
"</head>\n"
"<body>\n"
"<h1>Cache entry information</h1>\n"_ns;
uint32_t n;
rv = mOutputStream->Write(buffer.get(), buffer.Length(), &n);
if (NS_FAILED(rv)) return rv;
if (n != buffer.Length()) return NS_ERROR_UNEXPECTED;
rv = OpenCacheEntry(uri);
if (NS_FAILED(rv)) return rv;
inputStream.forget(result);
return NS_OK;
}
nsresult nsAboutCacheEntry::Channel::OpenCacheEntry(nsIURI* uri) {
nsresult rv;
rv = ParseURI(uri, mStorageName, getter_AddRefs(mLoadInfo), mEnhanceId,
getter_AddRefs(mCacheURI));
if (NS_FAILED(rv)) return rv;
return OpenCacheEntry();
}
nsresult nsAboutCacheEntry::Channel::OpenCacheEntry() {
nsresult rv;
nsCOMPtr<nsICacheStorage> storage;
rv = nsAboutCache::GetStorage(mStorageName, mLoadInfo,
getter_AddRefs(storage));
if (NS_FAILED(rv)) return rv;
// Invokes OnCacheEntryAvailable()
rv = storage->AsyncOpenURI(
mCacheURI, mEnhanceId,
nsICacheStorage::OPEN_READONLY | nsICacheStorage::OPEN_SECRETLY, this);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
nsresult nsAboutCacheEntry::Channel::ParseURI(nsIURI* uri,
nsACString& storageName,
nsILoadContextInfo** loadInfo,
nsCString& enahnceID,
nsIURI** cacheUri) {
//
// about:cache-entry?storage=[string]&contenxt=[string]&eid=[string]&uri=[string]
//
nsresult rv;
nsAutoCString path;
rv = uri->GetPathQueryRef(path);
if (NS_FAILED(rv)) return rv;
nsACString::const_iterator keyBegin, keyEnd, valBegin, begin, end;
path.BeginReading(begin);
path.EndReading(end);
keyBegin = begin;
keyEnd = end;
if (!FindInReadable("?storage="_ns, keyBegin, keyEnd)) {
return NS_ERROR_FAILURE;
}
valBegin = keyEnd; // the value of the storage key starts after the key
keyBegin = keyEnd;
keyEnd = end;
if (!FindInReadable("&context="_ns, keyBegin, keyEnd)) {
return NS_ERROR_FAILURE;
}
storageName.Assign(Substring(valBegin, keyBegin));
valBegin = keyEnd; // the value of the context key starts after the key
keyBegin = keyEnd;
keyEnd = end;
if (!FindInReadable("&eid="_ns, keyBegin, keyEnd)) return NS_ERROR_FAILURE;
nsAutoCString contextKey(Substring(valBegin, keyBegin));
valBegin = keyEnd; // the value of the eid key starts after the key
keyBegin = keyEnd;
keyEnd = end;
if (!FindInReadable("&uri="_ns, keyBegin, keyEnd)) return NS_ERROR_FAILURE;
enahnceID.Assign(Substring(valBegin, keyBegin));
valBegin = keyEnd; // the value of the uri key starts after the key
nsAutoCString uriSpec(Substring(valBegin, end)); // uri is the last one
// Uf... parsing done, now get some objects from it...
nsCOMPtr<nsILoadContextInfo> info = CacheFileUtils::ParseKey(contextKey);
if (!info) return NS_ERROR_FAILURE;
info.forget(loadInfo);
rv = NS_NewURI(cacheUri, uriSpec);
if (NS_FAILED(rv)) return rv;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsICacheEntryOpenCallback implementation
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnCacheEntryCheck(nsICacheEntry* aEntry,
uint32_t* result) {
*result = nsICacheEntryOpenCallback::ENTRY_WANTED;
return NS_OK;
}
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnCacheEntryAvailable(nsICacheEntry* entry,
bool isNew, nsresult status) {
nsresult rv;
mWaitingForData = false;
if (entry) {
rv = WriteCacheEntryDescription(entry);
} else {
rv = WriteCacheEntryUnavailable();
}
if (NS_FAILED(rv)) return rv;
if (!mWaitingForData) {
// Data is not expected, close the output of content now.
CloseContent();
}
return NS_OK;
}
//-----------------------------------------------------------------------------
// Print-out helper methods
//-----------------------------------------------------------------------------
#define APPEND_ROW(label, value) \
PR_BEGIN_MACRO \
buffer.AppendLiteral( \
" <tr>\n" \
" <th>"); \
buffer.AppendLiteral(label); \
buffer.AppendLiteral( \
":</th>\n" \
" <td>"); \
buffer.Append(value); \
buffer.AppendLiteral( \
"</td>\n" \
" </tr>\n"); \
PR_END_MACRO
nsresult nsAboutCacheEntry::Channel::WriteCacheEntryDescription(
nsICacheEntry* entry) {
nsresult rv;
// This method appears to run in a situation where the run-time stack
// should have plenty of space, so allocating a large string on the
// stack is OK.
nsAutoCStringN<4097> buffer;
uint32_t n;
nsAutoCString str;
rv = entry->GetKey(str);
if (NS_FAILED(rv)) return rv;
buffer.AssignLiteral(
"<table>\n"
" <tr>\n"
" <th>key:</th>\n"
" <td id=\"td-key\">");
// Test if the key is actually a URI
nsCOMPtr<nsIURI> uri;
rv = NS_NewURI(getter_AddRefs(uri), str);
nsAutoCString escapedStr;
nsAppendEscapedHTML(str, escapedStr);
// javascript: and data: URLs should not be linkified
// since clicking them can cause scripts to run - bug 162584
if (NS_SUCCEEDED(rv) &&
!(uri->SchemeIs("javascript") || uri->SchemeIs("data"))) {
buffer.AppendLiteral("<a href=\"");
buffer.Append(escapedStr);
buffer.AppendLiteral("\">");
buffer.Append(escapedStr);
buffer.AppendLiteral("</a>");
uri = nullptr;
} else {
buffer.Append(escapedStr);
}
buffer.AppendLiteral(
"</td>\n"
" </tr>\n");
// temp vars for reporting
char timeBuf[255];
uint32_t u = 0;
int32_t i = 0;
nsAutoCString s;
// Fetch Count
s.Truncate();
entry->GetFetchCount(&i);
s.AppendInt(i);
APPEND_ROW("fetch count", s);
// Last Fetched
entry->GetLastFetched(&u);
if (u) {
PrintTimeString(timeBuf, sizeof(timeBuf), u);
APPEND_ROW("last fetched", timeBuf);
} else {
APPEND_ROW("last fetched", "No last fetch time (bug 1000338)");
}
// Last Modified
entry->GetLastModified(&u);
if (u) {
PrintTimeString(timeBuf, sizeof(timeBuf), u);
APPEND_ROW("last modified", timeBuf);
} else {
APPEND_ROW("last modified", "No last modified time (bug 1000338)");
}
// Expiration Time
entry->GetExpirationTime(&u);
// Bug - 633747.
// When expiration time is 0, we show 1970-01-01 01:00:00 which is confusing.
// So we check if time is 0, then we show a message, "Expired Immediately"
if (u == 0) {
APPEND_ROW("expires", "Expired Immediately");
} else if (u < 0xFFFFFFFF) {
PrintTimeString(timeBuf, sizeof(timeBuf), u);
APPEND_ROW("expires", timeBuf);
} else {
APPEND_ROW("expires", "No expiration time");
}
// Data Size
s.Truncate();
uint32_t dataSize;
if (NS_FAILED(entry->GetStorageDataSize(&dataSize))) dataSize = 0;
s.AppendInt(
(int32_t)dataSize); // XXX nsICacheEntryInfo interfaces should be fixed.
s.AppendLiteral(" B");
APPEND_ROW("Data size", s);
// TODO - mayhemer
// Here used to be a link to the disk file (in the old cache for entries that
// did not fit any of the block files, in the new cache every time).
// I'd rather have a small set of buttons here to action on the entry:
// 1. save the content
// 2. save as a complete HTTP response (response head, headers, content)
// 3. doom the entry
// A new bug(s) should be filed here.
// Security Info
nsCOMPtr<nsISupports> securityInfo;
entry->GetSecurityInfo(getter_AddRefs(securityInfo));
if (securityInfo) {
APPEND_ROW("Security", "This is a secure document.");
} else {
APPEND_ROW(
"Security",
"This document does not have any security info associated with it.");
}
buffer.AppendLiteral(
"</table>\n"
"<hr/>\n"
"<table>\n");
mBuffer = &buffer; // make it available for OnMetaDataElement().
entry->VisitMetaData(this);
mBuffer = nullptr;
buffer.AppendLiteral("</table>\n");
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
buffer.Truncate();
// Provide a hexdump of the data
if (!dataSize) {
return NS_OK;
}
nsCOMPtr<nsIInputStream> stream;
entry->OpenInputStream(0, getter_AddRefs(stream));
if (!stream) {
return NS_OK;
}
RefPtr<nsInputStreamPump> pump;
rv = nsInputStreamPump::Create(getter_AddRefs(pump), stream);
if (NS_FAILED(rv)) {
return NS_OK; // just ignore
}
rv = pump->AsyncRead(this);
if (NS_FAILED(rv)) {
return NS_OK; // just ignore
}
mWaitingForData = true;
return NS_OK;
}
nsresult nsAboutCacheEntry::Channel::WriteCacheEntryUnavailable() {
uint32_t n;
constexpr auto buffer = "The cache entry you selected is not available."_ns;
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsICacheEntryMetaDataVisitor implementation
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnMetaDataElement(char const* key,
char const* value) {
mBuffer->AppendLiteral(
" <tr>\n"
" <th>");
mBuffer->Append(key);
mBuffer->AppendLiteral(
":</th>\n"
" <td>");
nsAppendEscapedHTML(nsDependentCString(value), *mBuffer);
mBuffer->AppendLiteral(
"</td>\n"
" </tr>\n");
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsIStreamListener implementation
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnStartRequest(nsIRequest* request) {
mHexDumpState = 0;
constexpr auto buffer = "<hr/>\n<pre>"_ns;
uint32_t n;
return mOutputStream->Write(buffer.get(), buffer.Length(), &n);
}
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnDataAvailable(nsIRequest* request,
nsIInputStream* aInputStream,
uint64_t aOffset, uint32_t aCount) {
uint32_t n;
return aInputStream->ReadSegments(&nsAboutCacheEntry::Channel::PrintCacheData,
this, aCount, &n);
}
/* static */
nsresult nsAboutCacheEntry::Channel::PrintCacheData(
nsIInputStream* aInStream, void* aClosure, const char* aFromSegment,
uint32_t aToOffset, uint32_t aCount, uint32_t* aWriteCount) {
nsAboutCacheEntry::Channel* a =
static_cast<nsAboutCacheEntry::Channel*>(aClosure);
nsCString buffer;
HexDump(&a->mHexDumpState, aFromSegment, aCount, buffer);
uint32_t n;
a->mOutputStream->Write(buffer.get(), buffer.Length(), &n);
*aWriteCount = aCount;
return NS_OK;
}
NS_IMETHODIMP
nsAboutCacheEntry::Channel::OnStopRequest(nsIRequest* request,
nsresult result) {
constexpr auto buffer = "</pre>\n"_ns;
uint32_t n;
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
CloseContent();
return NS_OK;
}
void nsAboutCacheEntry::Channel::CloseContent() {
constexpr auto buffer = "</body>\n</html>\n"_ns;
uint32_t n;
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
mOutputStream->Close();
mOutputStream = nullptr;
}