gecko/netwerk/protocol/http/nsHttpHeaderArray.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 ci et: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.
*
* The Initial Developer of the Original Code is
* Netscape Communications.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com> (original author)
* Patrick McManus <mcmanus@ducksong.com>
* Jason Duell <jduell.mcbugs@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsHttpHeaderArray.h"
#include "nsHttp.h"
//-----------------------------------------------------------------------------
// nsHttpHeaderArray <public>
//-----------------------------------------------------------------------------
nsresult
nsHttpHeaderArray::SetHeader(nsHttpAtom header,
const nsACString &value,
bool merge)
{
nsEntry *entry = nsnull;
PRInt32 index;
index = LookupEntry(header, &entry);
// If an empty value is passed in, then delete the header entry...
// unless we are merging, in which case this function becomes a NOP.
if (value.IsEmpty()) {
if (!merge && entry)
mHeaders.RemoveElementAt(index);
return NS_OK;
}
if (!entry) {
entry = mHeaders.AppendElement(); // new nsEntry()
if (!entry)
return NS_ERROR_OUT_OF_MEMORY;
entry->header = header;
entry->value = value;
} else if (merge && !IsSingletonHeader(header)) {
MergeHeader(header, entry, value);
} else {
// Replace the existing string with the new value
entry->value = value;
}
return NS_OK;
}
nsresult
nsHttpHeaderArray::SetHeaderFromNet(nsHttpAtom header, const nsACString &value)
{
nsEntry *entry = nsnull;
PRInt32 index;
index = LookupEntry(header, &entry);
if (!entry) {
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if (value.IsEmpty()) {
if (!TrackEmptyHeader(header)) {
LOG(("Ignoring Empty Header: %s\n", header.get()));
return NS_OK; // ignore empty headers by default
}
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}
entry = mHeaders.AppendElement(); //new nsEntry(header, value);
if (!entry)
return NS_ERROR_OUT_OF_MEMORY;
entry->header = header;
entry->value = value;
} else if (!IsSingletonHeader(header)) {
MergeHeader(header, entry, value);
} else {
// Multiple instances of non-mergeable header received from network
// - ignore if same value
if (!entry->value.Equals(value)) {
if (IsSuspectDuplicateHeader(header)) {
// reply may be corrupt/hacked (ex: CLRF injection attacks)
return NS_ERROR_CORRUPTED_CONTENT;
} // else silently drop value: keep value from 1st header seen
LOG(("Header %s silently dropped as non mergeable header\n",
header.get()));
}
}
return NS_OK;
}
void
nsHttpHeaderArray::ClearHeader(nsHttpAtom header)
{
mHeaders.RemoveElement(header, nsEntry::MatchHeader());
}
const char *
nsHttpHeaderArray::PeekHeader(nsHttpAtom header)
{
nsEntry *entry = nsnull;
LookupEntry(header, &entry);
return entry ? entry->value.get() : nsnull;
}
nsresult
nsHttpHeaderArray::GetHeader(nsHttpAtom header, nsACString &result)
{
nsEntry *entry = nsnull;
LookupEntry(header, &entry);
if (!entry)
return NS_ERROR_NOT_AVAILABLE;
result = entry->value;
return NS_OK;
}
nsresult
nsHttpHeaderArray::VisitHeaders(nsIHttpHeaderVisitor *visitor)
{
NS_ENSURE_ARG_POINTER(visitor);
PRUint32 i, count = mHeaders.Length();
for (i = 0; i < count; ++i) {
const nsEntry &entry = mHeaders[i];
if (NS_FAILED(visitor->VisitHeader(nsDependentCString(entry.header),
entry.value)))
break;
}
return NS_OK;
}
nsresult
nsHttpHeaderArray::ParseHeaderLine(const char *line,
nsHttpAtom *hdr,
char **val)
{
//
// BNF from section 4.2 of RFC 2616:
//
// message-header = field-name ":" [ field-value ]
// field-name = token
// field-value = *( field-content | LWS )
// field-content = <the OCTETs making up the field-value
// and consisting of either *TEXT or combinations
// of token, separators, and quoted-string>
//
// We skip over mal-formed headers in the hope that we'll still be able to
// do something useful with the response.
char *p = (char *) strchr(line, ':');
if (!p) {
LOG(("malformed header [%s]: no colon\n", line));
return NS_OK;
}
// make sure we have a valid token for the field-name
if (!nsHttp::IsValidToken(line, p)) {
LOG(("malformed header [%s]: field-name not a token\n", line));
return NS_OK;
}
*p = 0; // null terminate field-name
nsHttpAtom atom = nsHttp::ResolveAtom(line);
if (!atom) {
LOG(("failed to resolve atom [%s]\n", line));
return NS_OK;
}
// skip over whitespace
p = net_FindCharNotInSet(++p, HTTP_LWS);
// trim trailing whitespace - bug 86608
char *p2 = net_RFindCharNotInSet(p, HTTP_LWS);
*++p2 = 0; // null terminate header value; if all chars starting at |p|
// consisted of LWS, then p2 would have pointed at |p-1|, so
// the prefix increment is always valid.
// assign return values
if (hdr) *hdr = atom;
if (val) *val = p;
// assign response header
return SetHeaderFromNet(atom, nsDependentCString(p, p2 - p));
}
void
nsHttpHeaderArray::Flatten(nsACString &buf, bool pruneProxyHeaders)
{
PRUint32 i, count = mHeaders.Length();
for (i = 0; i < count; ++i) {
const nsEntry &entry = mHeaders[i];
// prune proxy headers if requested
if (pruneProxyHeaders && ((entry.header == nsHttp::Proxy_Authorization) ||
(entry.header == nsHttp::Proxy_Connection)))
continue;
buf.Append(entry.header);
buf.AppendLiteral(": ");
buf.Append(entry.value);
buf.AppendLiteral("\r\n");
}
}
const char *
nsHttpHeaderArray::PeekHeaderAt(PRUint32 index, nsHttpAtom &header)
{
const nsEntry &entry = mHeaders[index];
header = entry.header;
return entry.value.get();
}
void
nsHttpHeaderArray::Clear()
{
mHeaders.Clear();
}