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gecko/netwerk/protocol/about/nsAboutCacheEntry.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsICacheService.h"
#include "nsICacheSession.h"
#include "nsNetUtil.h"
#include "prprf.h"
#include "nsEscape.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsAboutProtocolUtils.h"
#include <algorithm>
#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) {
PR_snprintf(temp, sizeof(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) {
PR_snprintf(temp, sizeof(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,
nsICacheMetaDataVisitor)
//-----------------------------------------------------------------------------
// nsAboutCacheEntry::nsIAboutModule
NS_IMETHODIMP
nsAboutCacheEntry::NewChannel(nsIURI *uri, nsIChannel **result)
{
NS_ENSURE_ARG_POINTER(uri);
nsresult rv;
nsCOMPtr<nsIInputStream> stream;
rv = GetContentStream(uri, getter_AddRefs(stream));
if (NS_FAILED(rv)) return rv;
return NS_NewInputStreamChannel(result, uri, stream,
NS_LITERAL_CSTRING("text/html"),
NS_LITERAL_CSTRING("utf-8"));
}
NS_IMETHODIMP
nsAboutCacheEntry::GetURIFlags(nsIURI *aURI, uint32_t *result)
{
*result = nsIAboutModule::HIDE_FROM_ABOUTABOUT;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsAboutCacheEntry
nsresult
nsAboutCacheEntry::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;
NS_NAMED_LITERAL_CSTRING(
buffer,
"<!DOCTYPE html>\n"
"<html>\n"
"<head>\n"
" <title>Cache entry information</title>\n"
" <link rel=\"stylesheet\" "
"href=\"chrome://global/skin/about.css\" 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");
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::OpenCacheEntry(nsIURI *uri)
{
nsresult rv;
nsAutoCString clientID, key;
bool streamBased = true;
rv = ParseURI(uri, clientID, streamBased, key);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsICacheService> serv =
do_GetService(NS_CACHESERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
nsCOMPtr<nsICacheSession> session;
rv = serv->CreateSession(clientID.get(),
nsICache::STORE_ANYWHERE,
streamBased,
getter_AddRefs(session));
if (NS_FAILED(rv)) return rv;
rv = session->SetDoomEntriesIfExpired(false);
if (NS_FAILED(rv)) return rv;
return session->AsyncOpenCacheEntry(key, nsICache::ACCESS_READ, this, true);
}
//-----------------------------------------------------------------------------
// 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::WriteCacheEntryDescription(nsICacheEntryDescriptor *descriptor)
{
nsresult rv;
nsCString buffer;
uint32_t n;
nsAutoCString str;
rv = descriptor->GetKey(str);
if (NS_FAILED(rv)) return rv;
buffer.SetCapacity(4096);
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;
bool isJS = false;
bool isData = false;
rv = NS_NewURI(getter_AddRefs(uri), str);
// 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", &isJS);
uri->SchemeIs("data", &isData);
}
char* escapedStr = nsEscapeHTML(str.get());
if (NS_SUCCEEDED(rv) && !(isJS || isData)) {
buffer.AppendLiteral("<a href=\"");
buffer.Append(escapedStr);
buffer.AppendLiteral("\">");
buffer.Append(escapedStr);
buffer.AppendLiteral("</a>");
uri = 0;
}
else
buffer.Append(escapedStr);
nsMemory::Free(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();
descriptor->GetFetchCount(&i);
s.AppendInt(i);
APPEND_ROW("fetch count", s);
// Last Fetched
descriptor->GetLastFetched(&u);
if (u) {
PrintTimeString(timeBuf, sizeof(timeBuf), u);
APPEND_ROW("last fetched", timeBuf);
} else {
APPEND_ROW("last fetched", "No last fetch time");
}
// Last Modified
descriptor->GetLastModified(&u);
if (u) {
PrintTimeString(timeBuf, sizeof(timeBuf), u);
APPEND_ROW("last modified", timeBuf);
} else {
APPEND_ROW("last modified", "No last modified time");
}
// Expiration Time
descriptor->GetExpirationTime(&u);
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;
descriptor->GetStorageDataSize(&dataSize);
s.AppendInt((int32_t)dataSize); // XXX nsICacheEntryInfo interfaces should be fixed.
APPEND_ROW("Data size", s);
// Storage Policy
// XXX Stream Based?
// XXX Cache Device
// File on disk
nsCOMPtr<nsIFile> cacheFile;
rv = descriptor->GetFile(getter_AddRefs(cacheFile));
if (NS_SUCCEEDED(rv)) {
nsAutoString filePath;
cacheFile->GetPath(filePath);
APPEND_ROW("file on disk", NS_ConvertUTF16toUTF8(filePath));
}
else
APPEND_ROW("file on disk", "none");
// Security Info
nsCOMPtr<nsISupports> securityInfo;
descriptor->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");
// Meta Data
// let's just look for some well known (HTTP) meta data tags, for now.
// Client ID
nsXPIDLCString str2;
descriptor->GetClientID(getter_Copies(str2));
if (!str2.IsEmpty()) APPEND_ROW("Client", str2);
mBuffer = &buffer; // make it available for VisitMetaDataElement().
// nsCacheEntryDescriptor::VisitMetaData calls
// nsCacheEntry.h VisitMetaDataElements, which returns
// nsCacheMetaData::VisitElements, which calls
// nsAboutCacheEntry::VisitMetaDataElement (below) in a loop.
descriptor->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) { // don't draw an <hr> if the Data Size is 0.
nsCOMPtr<nsIInputStream> stream;
descriptor->OpenInputStream(0, getter_AddRefs(stream));
if (stream) {
buffer.AssignLiteral("<hr/>\n"
"<pre>");
uint32_t hexDumpState = 0;
char chunk[4096];
while(NS_SUCCEEDED(stream->Read(chunk, sizeof(chunk), &n)) &&
n > 0) {
HexDump(&hexDumpState, chunk, n, buffer);
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
buffer.Truncate();
}
buffer.AssignLiteral("</pre>\n");
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
}
}
return NS_OK;
}
nsresult
nsAboutCacheEntry::WriteCacheEntryUnavailable()
{
uint32_t n;
NS_NAMED_LITERAL_CSTRING(buffer,
"The cache entry you selected is not available.");
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
return NS_OK;
}
nsresult
nsAboutCacheEntry::ParseURI(nsIURI *uri, nsCString &clientID,
bool &streamBased, nsCString &key)
{
//
// about:cache-entry?client=[string]&sb=[boolean]&key=[string]
//
nsresult rv;
nsAutoCString path;
rv = uri->GetPath(path);
if (NS_FAILED(rv)) return rv;
nsACString::const_iterator i1, i2, i3, end;
path.BeginReading(i1);
path.EndReading(end);
i2 = end;
if (!FindInReadable(NS_LITERAL_CSTRING("?client="), i1, i2))
return NS_ERROR_FAILURE;
// i2 points to the start of clientID
i1 = i2;
i3 = end;
if (!FindInReadable(NS_LITERAL_CSTRING("&sb="), i1, i3))
return NS_ERROR_FAILURE;
// i1 points to the end of clientID
// i3 points to the start of isStreamBased
clientID.Assign(Substring(i2, i1));
i1 = i3;
i2 = end;
if (!FindInReadable(NS_LITERAL_CSTRING("&key="), i1, i2))
return NS_ERROR_FAILURE;
// i1 points to the end of isStreamBased
// i2 points to the start of key
streamBased = FindCharInReadable('1', i3, i1);
key.Assign(Substring(i2, end));
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsICacheMetaDataVisitor implementation
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsAboutCacheEntry::VisitMetaDataElement(const char * key,
const char * value,
bool * keepGoing)
{
mBuffer->AppendLiteral(" <tr>\n"
" <th>");
mBuffer->Append(key);
mBuffer->AppendLiteral(":</th>\n"
" <td>");
char* escapedValue = nsEscapeHTML(value);
mBuffer->Append(escapedValue);
nsMemory::Free(escapedValue);
mBuffer->AppendLiteral("</td>\n"
" </tr>\n");
*keepGoing = true;
return NS_OK;
}
//-----------------------------------------------------------------------------
// nsICacheListener implementation
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsAboutCacheEntry::OnCacheEntryAvailable(nsICacheEntryDescriptor *entry,
nsCacheAccessMode access,
nsresult status)
{
nsresult rv;
if (entry)
rv = WriteCacheEntryDescription(entry);
else
rv = WriteCacheEntryUnavailable();
if (NS_FAILED(rv)) return rv;
uint32_t n;
NS_NAMED_LITERAL_CSTRING(buffer, "</body>\n</html>\n");
mOutputStream->Write(buffer.get(), buffer.Length(), &n);
mOutputStream->Close();
mOutputStream = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsAboutCacheEntry::OnCacheEntryDoomed(nsresult status)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
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