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| -rw-r--r-- | netwerk/streamconv/converters/nsMultiMixedConv.h | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/netwerk/streamconv/converters/nsMultiMixedConv.h b/netwerk/streamconv/converters/nsMultiMixedConv.h new file mode 100644 index 0000000000..feb93ff360 --- /dev/null +++ b/netwerk/streamconv/converters/nsMultiMixedConv.h @@ -0,0 +1,256 @@ +/* -*- 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/. */ +#ifndef __nsmultimixedconv__h__ +#define __nsmultimixedconv__h__ + +#include "nsIStreamConverter.h" +#include "nsIChannel.h" +#include "nsString.h" +#include "nsCOMPtr.h" +#include "nsIByteRangeRequest.h" +#include "nsIMultiPartChannel.h" +#include "mozilla/Attributes.h" +#include "mozilla/IncrementalTokenizer.h" +#include "nsHttpResponseHead.h" + +#define NS_MULTIMIXEDCONVERTER_CID \ + { /* 7584CE90-5B25-11d3-A175-0050041CAF44 */ \ + 0x7584ce90, 0x5b25, 0x11d3, { \ + 0xa1, 0x75, 0x0, 0x50, 0x4, 0x1c, 0xaf, 0x44 \ + } \ + } + +// +// nsPartChannel is a "dummy" channel which represents an individual part of +// a multipart/mixed stream... +// +// Instances on this channel are passed out to the consumer through the +// nsIStreamListener interface. +// +class nsPartChannel final : public nsIChannel, + public nsIByteRangeRequest, + public nsIMultiPartChannel { + public: + nsPartChannel(nsIChannel* aMultipartChannel, uint32_t aPartID, + nsIStreamListener* aListener); + + void InitializeByteRange(int64_t aStart, int64_t aEnd); + void SetIsLastPart() { mIsLastPart = true; } + nsresult SendOnStartRequest(nsISupports* aContext); + nsresult SendOnDataAvailable(nsISupports* aContext, nsIInputStream* aStream, + uint64_t aOffset, uint32_t aLen); + nsresult SendOnStopRequest(nsISupports* aContext, nsresult aStatus); + /* SetContentDisposition expects the full value of the Content-Disposition + * header */ + void SetContentDisposition(const nsACString& aContentDispositionHeader); + // TODO(ER): This appears to be dead code + void SetResponseHead(mozilla::net::nsHttpResponseHead* head) { + mResponseHead.reset(head); + } + + NS_DECL_ISUPPORTS + NS_DECL_NSIREQUEST + NS_DECL_NSICHANNEL + NS_DECL_NSIBYTERANGEREQUEST + NS_DECL_NSIMULTIPARTCHANNEL + + protected: + ~nsPartChannel() = default; + + protected: + nsCOMPtr<nsIChannel> mMultipartChannel; + nsCOMPtr<nsIStreamListener> mListener; + UniquePtr<mozilla::net::nsHttpResponseHead> mResponseHead; + + nsresult mStatus; + nsLoadFlags mLoadFlags; + + nsCOMPtr<nsILoadGroup> mLoadGroup; + + nsCString mContentType; + nsCString mContentCharset; + uint32_t mContentDisposition; + nsString mContentDispositionFilename; + nsCString mContentDispositionHeader; + uint64_t mContentLength; + + bool mIsByteRangeRequest; + int64_t mByteRangeStart; + int64_t mByteRangeEnd; + + uint32_t mPartID; // unique ID that can be used to identify + // this part of the multipart document + bool mIsLastPart; +}; + +// The nsMultiMixedConv stream converter converts a stream of type +// "multipart/x-mixed-replace" to it's subparts. There was some debate as to +// whether or not the functionality desired when HTTP confronted this type +// required a stream converter. After all, this type really prompts various +// viewer related actions rather than stream conversion. There simply needs to +// be a piece in place that can strip out the multiple parts of a stream of this +// type, and "display" them accordingly. +// +// With that said, this "stream converter" spends more time packaging up the sub +// parts of the main stream and sending them off the destination stream +// listener, than doing any real stream parsing/converting. +// +// WARNING: This converter requires that it's destination stream listener be +// able to handle multiple OnStartRequest(), OnDataAvailable(), and +// OnStopRequest() call combinations. Each series represents the beginning, +// data production, and ending phase of each sub- part of the original +// stream. +// +// NOTE: this MIME-type is used by HTTP, *not* SMTP, or IMAP. +// +// NOTE: For reference, a general description of how this MIME type should be +// handled via HTTP, see +// http://home.netscape.com/assist/net_sites/pushpull.html . Note that real +// world server content deviates considerably from this overview. +// +// Implementation assumptions: +// Assumed structue: +// --BoundaryToken[\r]\n +// content-type: foo/bar[\r]\n +// ... (other headers if any) +// [\r]\n (second line feed to delimit end of headers) +// data +// --BoundaryToken-- (end delimited by final "--") +// +// linebreaks can be either CRLF or LFLF. linebreaks preceding +// boundary tokens are NOT considered part of the data. BoundaryToken +// is any opaque string. +// +// + +class nsMultiMixedConv : public nsIStreamConverter { + public: + NS_DECL_ISUPPORTS + NS_DECL_NSISTREAMCONVERTER + NS_DECL_NSISTREAMLISTENER + NS_DECL_NSIREQUESTOBSERVER + + explicit nsMultiMixedConv(); + + protected: + typedef mozilla::IncrementalTokenizer::Token Token; + + virtual ~nsMultiMixedConv() = default; + + nsresult SendStart(); + void AccumulateData(Token const& aToken); + nsresult SendData(); + nsresult SendStop(nsresult aStatus); + + // member data + nsCOMPtr<nsIStreamListener> mFinalListener; // this guy gets the converted + // data via his OnDataAvailable() + + nsCOMPtr<nsIChannel> + mChannel; // The channel as we get in in OnStartRequest call + RefPtr<nsPartChannel> mPartChannel; // the channel for the given part we're + // processing. one channel per part. + nsCOMPtr<nsISupports> mContext; + nsCString mContentType; + nsCString mContentDisposition; + nsCString mContentSecurityPolicy; + nsCString mRootContentSecurityPolicy; + uint64_t mContentLength; + uint64_t mTotalSent; + + // The following members are for tracking the byte ranges in + // multipart/mixed content which specified the 'Content-Range:' + // header... + int64_t mByteRangeStart; + int64_t mByteRangeEnd; + bool mIsByteRangeRequest; + // This flag is set first time we create a part channel. + // We use it to prevent duplicated OnStopRequest call on the listener + // when we fail from some reason to ever create a part channel that + // ensures correct notifications. + bool mRequestListenerNotified; + + uint32_t mCurrentPartID; + + // Flag preventing reenter of OnDataAvailable in case the target listener + // ends up spinning the event loop. + bool mInOnDataAvailable; + + // Current state of the incremental parser + enum EParserState { + PREAMBLE, + BOUNDARY_CRLF, + HEADER_NAME, + HEADER_SEP, + HEADER_VALUE, + BODY_INIT, + BODY, + TRAIL_DASH1, + TRAIL_DASH2, + EPILOGUE, + + INIT = PREAMBLE + } mParserState; + + // Response part header value, valid when we find a header name + // we recognize. + enum EHeader : uint32_t { + HEADER_FIRST, + HEADER_CONTENT_TYPE = HEADER_FIRST, + HEADER_CONTENT_LENGTH, + HEADER_CONTENT_DISPOSITION, + HEADER_SET_COOKIE, + HEADER_CONTENT_RANGE, + HEADER_RANGE, + HEADER_CONTENT_SECURITY_POLICY, + HEADER_UNKNOWN + } mResponseHeader; + // Cumulated value of a response header. + nsCString mResponseHeaderValue; + + nsCString mBoundary; + mozilla::IncrementalTokenizer mTokenizer; + + // When in the "body parsing" mode, see below, we cumulate raw data + // incrementally to mainly avoid any unnecessary granularity. + // mRawData points to the first byte in the tokenizer buffer where part + // body data begins or continues. mRawDataLength is a cumulated length + // of that data during a single tokenizer input feed. This is always + // flushed right after we fed the tokenizer. + nsACString::const_char_iterator mRawData; + nsACString::size_type mRawDataLength; + + // At the start we don't know if the server will be sending boundary with + // or without the leading dashes. + Token mBoundaryToken; + Token mBoundaryTokenWithDashes; + // We need these custom tokens to allow finding CRLF when in the binary mode. + // CRLF before boundary is considered part of the boundary and not part of + // the data. + Token mLFToken; + Token mCRLFToken; + // Custom tokens for each of the response headers we recognize. + Token mHeaderTokens[HEADER_UNKNOWN]; + + // Resets values driven by part headers, like content type, to their defaults, + // called at the start of every part processing. + void HeadersToDefault(); + // Processes captured value of mResponseHeader header. + nsresult ProcessHeader(); + // Switches the parser and tokenizer state to "binary mode" which only + // searches for the 'CRLF boundary' delimiter. + void SwitchToBodyParsing(); + // Switches to the default mode, we are in this mode when parsing headers and + // control data around the boundary delimiters. + void SwitchToControlParsing(); + // Turns on or off recognition of the headers we recognize in part heads. + void SetHeaderTokensEnabled(bool aEnable); + + // The main parser callback called by the IncrementalTokenizer + // instance from OnDataAvailable or OnStopRequest. + nsresult ConsumeToken(Token const& token); +}; + +#endif /* __nsmultimixedconv__h__ */ |