gecko-dev/netwerk/protocol/http/nsHttpHeaderArray.cpp
Patrick McManus cb8d9416e8 bug 957093 - namespace consistency for netwerk/protocol/http r=sworkman
--HG--
extra : rebase_source : f5b1a5e92239003020e75019efbe78a636150b34
2014-01-07 17:05:56 -05:00

221 lines
6.4 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 ci et: */
/* 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/. */
// HttpLog.h should generally be included first
#include "HttpLog.h"
#include "nsHttpHeaderArray.h"
#include "nsURLHelper.h"
#include "nsIHttpHeaderVisitor.h"
namespace mozilla {
namespace net {
//-----------------------------------------------------------------------------
// nsHttpHeaderArray <public>
//-----------------------------------------------------------------------------
nsresult
nsHttpHeaderArray::SetHeader(nsHttpAtom header,
const nsACString &value,
bool merge)
{
nsEntry *entry = nullptr;
int32_t 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 = nullptr;
LookupEntry(header, &entry);
if (!entry) {
if (value.IsEmpty()) {
if (!TrackEmptyHeader(header)) {
LOG(("Ignoring Empty Header: %s\n", header.get()));
return NS_OK; // ignore empty headers by default
}
}
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) const
{
const nsEntry *entry = nullptr;
LookupEntry(header, &entry);
return entry ? entry->value.get() : nullptr;
}
nsresult
nsHttpHeaderArray::GetHeader(nsHttpAtom header, nsACString &result) const
{
const nsEntry *entry = nullptr;
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);
uint32_t 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)
{
uint32_t 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(uint32_t index, nsHttpAtom &header) const
{
const nsEntry &entry = mHeaders[index];
header = entry.header;
return entry.value.get();
}
void
nsHttpHeaderArray::Clear()
{
mHeaders.Clear();
}
} // namespace mozilla::net
} // namespace mozilla