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110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// data implementation
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#include "nsDataChannel.h"
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#include "mozilla/Base64.h"
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#include "nsDataHandler.h"
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#include "nsIInputStream.h"
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#include "nsEscape.h"
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#include "nsStringStream.h"
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using namespace mozilla;
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/**
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* Helper for performing a fallible unescape.
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*
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* @param aStr The string to unescape.
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* @param aBuffer Buffer to unescape into if necessary.
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* @param rv Out: nsresult indicating success or failure of unescaping.
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* @return Reference to the string containing the unescaped data.
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*/
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const nsACString& Unescape(const nsACString& aStr, nsACString& aBuffer,
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nsresult* rv) {
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MOZ_ASSERT(rv);
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bool appended = false;
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*rv = NS_UnescapeURL(aStr.Data(), aStr.Length(), /* aFlags = */ 0, aBuffer,
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appended, mozilla::fallible);
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if (NS_FAILED(*rv) || !appended) {
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return aStr;
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}
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return aBuffer;
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}
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nsresult nsDataChannel::OpenContentStream(bool async, nsIInputStream** result,
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nsIChannel** channel) {
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NS_ENSURE_TRUE(URI(), NS_ERROR_NOT_INITIALIZED);
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nsresult rv;
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// In order to avoid potentially building up a new path including the
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// ref portion of the URI, which we don't care about, we clone a version
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// of the URI that does not have a ref and in most cases should share
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// string buffers with the original URI.
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nsCOMPtr<nsIURI> uri;
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rv = NS_GetURIWithoutRef(URI(), getter_AddRefs(uri));
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if (NS_FAILED(rv)) return rv;
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nsAutoCString path;
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rv = uri->GetPathQueryRef(path);
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if (NS_FAILED(rv)) return rv;
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nsCString contentType, contentCharset;
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nsDependentCSubstring dataRange;
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bool lBase64;
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rv = nsDataHandler::ParsePathWithoutRef(path, contentType, &contentCharset,
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lBase64, &dataRange);
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if (NS_FAILED(rv)) return rv;
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// This will avoid a copy if nothing needs to be unescaped.
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nsAutoCString unescapedBuffer;
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const nsACString& data = Unescape(dataRange, unescapedBuffer, &rv);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (lBase64 && &data == &unescapedBuffer) {
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// Don't allow spaces in base64-encoded content. This is only
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// relevant for escaped spaces; other spaces are stripped in
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// NewURI. We know there were no escaped spaces if the data buffer
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// wasn't used in |Unescape|.
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unescapedBuffer.StripWhitespace();
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}
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nsCOMPtr<nsIInputStream> bufInStream;
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uint32_t contentLen;
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if (lBase64) {
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nsAutoCString decodedData;
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rv = Base64Decode(data, decodedData);
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if (NS_FAILED(rv)) {
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// Returning this error code instead of what Base64Decode returns
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// (NS_ERROR_ILLEGAL_VALUE) will prevent rendering of redirect response
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// content by HTTP channels. It's also more logical error to return.
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// Here we know the URL is actually corrupted.
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return NS_ERROR_MALFORMED_URI;
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}
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contentLen = decodedData.Length();
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rv = NS_NewCStringInputStream(getter_AddRefs(bufInStream), decodedData);
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} else {
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contentLen = data.Length();
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rv = NS_NewCStringInputStream(getter_AddRefs(bufInStream), data);
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}
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if (NS_FAILED(rv)) return rv;
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SetContentType(contentType);
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SetContentCharset(contentCharset);
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mContentLength = contentLen;
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bufInStream.forget(result);
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return NS_OK;
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}
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