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-rw-r--r--netwerk/protocol/http/nsHttpResponseHead.cpp1359
1 files changed, 1359 insertions, 0 deletions
diff --git a/netwerk/protocol/http/nsHttpResponseHead.cpp b/netwerk/protocol/http/nsHttpResponseHead.cpp
new file mode 100644
index 0000000000..1ce51afd93
--- /dev/null
+++ b/netwerk/protocol/http/nsHttpResponseHead.cpp
@@ -0,0 +1,1359 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=4 sw=2 sts=2 et cin: */
+/* 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 "mozilla/Unused.h"
+#include "nsHttpResponseHead.h"
+#include "nsIHttpHeaderVisitor.h"
+#include "nsPrintfCString.h"
+#include "prtime.h"
+#include "nsCRT.h"
+#include "nsURLHelper.h"
+#include "CacheControlParser.h"
+#include <algorithm>
+
+namespace mozilla {
+namespace net {
+
+//-----------------------------------------------------------------------------
+// nsHttpResponseHead <public>
+//-----------------------------------------------------------------------------
+
+// Note that the code below MUST be synchronized with the IPC
+// serialization/deserialization in PHttpChannelParams.h.
+nsHttpResponseHead::nsHttpResponseHead(const nsHttpResponseHead& aOther) {
+ nsHttpResponseHead& other = const_cast<nsHttpResponseHead&>(aOther);
+ RecursiveMutexAutoLock monitor(other.mRecursiveMutex);
+
+ mHeaders = other.mHeaders;
+ mVersion = other.mVersion;
+ mStatus = other.mStatus;
+ mStatusText = other.mStatusText;
+ mContentLength = other.mContentLength;
+ mContentType = other.mContentType;
+ mContentCharset = other.mContentCharset;
+ mHasCacheControl = other.mHasCacheControl;
+ mCacheControlPublic = other.mCacheControlPublic;
+ mCacheControlPrivate = other.mCacheControlPrivate;
+ mCacheControlNoStore = other.mCacheControlNoStore;
+ mCacheControlNoCache = other.mCacheControlNoCache;
+ mCacheControlImmutable = other.mCacheControlImmutable;
+ mCacheControlStaleWhileRevalidateSet =
+ other.mCacheControlStaleWhileRevalidateSet;
+ mCacheControlStaleWhileRevalidate = other.mCacheControlStaleWhileRevalidate;
+ mCacheControlMaxAgeSet = other.mCacheControlMaxAgeSet;
+ mCacheControlMaxAge = other.mCacheControlMaxAge;
+ mPragmaNoCache = other.mPragmaNoCache;
+}
+
+nsHttpResponseHead& nsHttpResponseHead::operator=(
+ const nsHttpResponseHead& aOther) {
+ nsHttpResponseHead& other = const_cast<nsHttpResponseHead&>(aOther);
+ RecursiveMutexAutoLock monitorOther(other.mRecursiveMutex);
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ mHeaders = other.mHeaders;
+ mVersion = other.mVersion;
+ mStatus = other.mStatus;
+ mStatusText = other.mStatusText;
+ mContentLength = other.mContentLength;
+ mContentType = other.mContentType;
+ mContentCharset = other.mContentCharset;
+ mHasCacheControl = other.mHasCacheControl;
+ mCacheControlPublic = other.mCacheControlPublic;
+ mCacheControlPrivate = other.mCacheControlPrivate;
+ mCacheControlNoStore = other.mCacheControlNoStore;
+ mCacheControlNoCache = other.mCacheControlNoCache;
+ mCacheControlImmutable = other.mCacheControlImmutable;
+ mCacheControlStaleWhileRevalidateSet =
+ other.mCacheControlStaleWhileRevalidateSet;
+ mCacheControlStaleWhileRevalidate = other.mCacheControlStaleWhileRevalidate;
+ mCacheControlMaxAgeSet = other.mCacheControlMaxAgeSet;
+ mCacheControlMaxAge = other.mCacheControlMaxAge;
+ mPragmaNoCache = other.mPragmaNoCache;
+
+ return *this;
+}
+
+HttpVersion nsHttpResponseHead::Version() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mVersion;
+}
+
+uint16_t nsHttpResponseHead::Status() const {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mStatus;
+}
+
+void nsHttpResponseHead::StatusText(nsACString& aStatusText) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ aStatusText = mStatusText;
+}
+
+int64_t nsHttpResponseHead::ContentLength() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mContentLength;
+}
+
+void nsHttpResponseHead::ContentType(nsACString& aContentType) const {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ aContentType = mContentType;
+}
+
+void nsHttpResponseHead::ContentCharset(nsACString& aContentCharset) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ aContentCharset = mContentCharset;
+}
+
+bool nsHttpResponseHead::Public() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mCacheControlPublic;
+}
+
+bool nsHttpResponseHead::Private() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mCacheControlPrivate;
+}
+
+bool nsHttpResponseHead::NoStore() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mCacheControlNoStore;
+}
+
+bool nsHttpResponseHead::NoCache() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return NoCache_locked();
+}
+
+bool nsHttpResponseHead::Immutable() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mCacheControlImmutable;
+}
+
+nsresult nsHttpResponseHead::SetHeader(const nsACString& hdr,
+ const nsACString& val, bool merge) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ if (mInVisitHeaders) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsHttpAtom atom = nsHttp::ResolveAtom(hdr);
+ if (!atom) {
+ NS_WARNING("failed to resolve atom");
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ return SetHeader_locked(atom, hdr, val, merge);
+}
+
+nsresult nsHttpResponseHead::SetHeader(const nsHttpAtom& hdr,
+ const nsACString& val, bool merge) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ if (mInVisitHeaders) {
+ return NS_ERROR_FAILURE;
+ }
+
+ return SetHeader_locked(hdr, ""_ns, val, merge);
+}
+
+nsresult nsHttpResponseHead::SetHeader_locked(const nsHttpAtom& atom,
+ const nsACString& hdr,
+ const nsACString& val,
+ bool merge) {
+ nsresult rv = mHeaders.SetHeader(atom, hdr, val, merge,
+ nsHttpHeaderArray::eVarietyResponse);
+ if (NS_FAILED(rv)) return rv;
+
+ // respond to changes in these headers. we need to reparse the entire
+ // header since the change may have merged in additional values.
+ if (atom == nsHttp::Cache_Control) {
+ ParseCacheControl(mHeaders.PeekHeader(atom));
+ } else if (atom == nsHttp::Pragma) {
+ ParsePragma(mHeaders.PeekHeader(atom));
+ }
+
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::GetHeader(const nsHttpAtom& h,
+ nsACString& v) const {
+ v.Truncate();
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mHeaders.GetHeader(h, v);
+}
+
+void nsHttpResponseHead::ClearHeader(const nsHttpAtom& h) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mHeaders.ClearHeader(h);
+}
+
+void nsHttpResponseHead::ClearHeaders() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mHeaders.Clear();
+}
+
+bool nsHttpResponseHead::HasHeaderValue(const nsHttpAtom& h, const char* v) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mHeaders.HasHeaderValue(h, v);
+}
+
+bool nsHttpResponseHead::HasHeader(const nsHttpAtom& h) const {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return mHeaders.HasHeader(h);
+}
+
+void nsHttpResponseHead::SetContentType(const nsACString& s) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mContentType = s;
+}
+
+void nsHttpResponseHead::SetContentCharset(const nsACString& s) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mContentCharset = s;
+}
+
+void nsHttpResponseHead::SetContentLength(int64_t len) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ mContentLength = len;
+ if (len < 0) {
+ mHeaders.ClearHeader(nsHttp::Content_Length);
+ } else {
+ DebugOnly<nsresult> rv = mHeaders.SetHeader(
+ nsHttp::Content_Length, nsPrintfCString("%" PRId64, len), false,
+ nsHttpHeaderArray::eVarietyResponse);
+ MOZ_ASSERT(NS_SUCCEEDED(rv));
+ }
+}
+
+void nsHttpResponseHead::Flatten(nsACString& buf, bool pruneTransients) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ if (mVersion == HttpVersion::v0_9) return;
+
+ buf.AppendLiteral("HTTP/");
+ if (mVersion == HttpVersion::v3_0) {
+ buf.AppendLiteral("3 ");
+ } else if (mVersion == HttpVersion::v2_0) {
+ buf.AppendLiteral("2 ");
+ } else if (mVersion == HttpVersion::v1_1) {
+ buf.AppendLiteral("1.1 ");
+ } else {
+ buf.AppendLiteral("1.0 ");
+ }
+
+ buf.Append(nsPrintfCString("%u", unsigned(mStatus)) + " "_ns + mStatusText +
+ "\r\n"_ns);
+
+ mHeaders.Flatten(buf, false, pruneTransients);
+}
+
+void nsHttpResponseHead::FlattenNetworkOriginalHeaders(nsACString& buf) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ if (mVersion == HttpVersion::v0_9) {
+ return;
+ }
+
+ mHeaders.FlattenOriginalHeader(buf);
+}
+
+nsresult nsHttpResponseHead::ParseCachedHead(const char* block) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ LOG(("nsHttpResponseHead::ParseCachedHead [this=%p]\n", this));
+
+ // this command works on a buffer as prepared by Flatten, as such it is
+ // not very forgiving ;-)
+
+ const char* p = strstr(block, "\r\n");
+ if (!p) return NS_ERROR_UNEXPECTED;
+
+ ParseStatusLine_locked(nsDependentCSubstring(block, p - block));
+
+ do {
+ block = p + 2;
+
+ if (*block == 0) break;
+
+ p = strstr(block, "\r\n");
+ if (!p) return NS_ERROR_UNEXPECTED;
+
+ Unused << ParseHeaderLine_locked(nsDependentCSubstring(block, p - block),
+ false);
+
+ } while (true);
+
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::ParseCachedOriginalHeaders(char* block) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ LOG(("nsHttpResponseHead::ParseCachedOriginalHeader [this=%p]\n", this));
+
+ // this command works on a buffer as prepared by FlattenOriginalHeader,
+ // as such it is not very forgiving ;-)
+
+ if (!block) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ char* p = block;
+ nsHttpAtom hdr;
+ nsAutoCString headerNameOriginal;
+ nsAutoCString val;
+ nsresult rv;
+
+ do {
+ block = p;
+
+ if (*block == 0) break;
+
+ p = strstr(block, "\r\n");
+ if (!p) return NS_ERROR_UNEXPECTED;
+
+ *p = 0;
+ if (NS_FAILED(nsHttpHeaderArray::ParseHeaderLine(
+ nsDependentCString(block, p - block), &hdr, &headerNameOriginal,
+ &val))) {
+ return NS_OK;
+ }
+
+ rv = mHeaders.SetResponseHeaderFromCache(
+ hdr, headerNameOriginal, val,
+ nsHttpHeaderArray::eVarietyResponseNetOriginal);
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ p = p + 2;
+ } while (true);
+
+ return NS_OK;
+}
+
+void nsHttpResponseHead::AssignDefaultStatusText() {
+ LOG(("response status line needs default reason phrase\n"));
+
+ // if a http response doesn't contain a reason phrase, put one in based
+ // on the status code. The reason phrase is totally meaningless so its
+ // ok to have a default catch all here - but this makes debuggers and addons
+ // a little saner to use if we don't map things to "404 OK" or other nonsense.
+ // In particular, HTTP/2 does not use reason phrases at all so they need to
+ // always be injected.
+
+ switch (mStatus) {
+ // start with the most common
+ case 200:
+ mStatusText.AssignLiteral("OK");
+ break;
+ case 404:
+ mStatusText.AssignLiteral("Not Found");
+ break;
+ case 301:
+ mStatusText.AssignLiteral("Moved Permanently");
+ break;
+ case 304:
+ mStatusText.AssignLiteral("Not Modified");
+ break;
+ case 307:
+ mStatusText.AssignLiteral("Temporary Redirect");
+ break;
+ case 500:
+ mStatusText.AssignLiteral("Internal Server Error");
+ break;
+
+ // also well known
+ case 100:
+ mStatusText.AssignLiteral("Continue");
+ break;
+ case 101:
+ mStatusText.AssignLiteral("Switching Protocols");
+ break;
+ case 201:
+ mStatusText.AssignLiteral("Created");
+ break;
+ case 202:
+ mStatusText.AssignLiteral("Accepted");
+ break;
+ case 203:
+ mStatusText.AssignLiteral("Non Authoritative");
+ break;
+ case 204:
+ mStatusText.AssignLiteral("No Content");
+ break;
+ case 205:
+ mStatusText.AssignLiteral("Reset Content");
+ break;
+ case 206:
+ mStatusText.AssignLiteral("Partial Content");
+ break;
+ case 207:
+ mStatusText.AssignLiteral("Multi-Status");
+ break;
+ case 208:
+ mStatusText.AssignLiteral("Already Reported");
+ break;
+ case 300:
+ mStatusText.AssignLiteral("Multiple Choices");
+ break;
+ case 302:
+ mStatusText.AssignLiteral("Found");
+ break;
+ case 303:
+ mStatusText.AssignLiteral("See Other");
+ break;
+ case 305:
+ mStatusText.AssignLiteral("Use Proxy");
+ break;
+ case 308:
+ mStatusText.AssignLiteral("Permanent Redirect");
+ break;
+ case 400:
+ mStatusText.AssignLiteral("Bad Request");
+ break;
+ case 401:
+ mStatusText.AssignLiteral("Unauthorized");
+ break;
+ case 402:
+ mStatusText.AssignLiteral("Payment Required");
+ break;
+ case 403:
+ mStatusText.AssignLiteral("Forbidden");
+ break;
+ case 405:
+ mStatusText.AssignLiteral("Method Not Allowed");
+ break;
+ case 406:
+ mStatusText.AssignLiteral("Not Acceptable");
+ break;
+ case 407:
+ mStatusText.AssignLiteral("Proxy Authentication Required");
+ break;
+ case 408:
+ mStatusText.AssignLiteral("Request Timeout");
+ break;
+ case 409:
+ mStatusText.AssignLiteral("Conflict");
+ break;
+ case 410:
+ mStatusText.AssignLiteral("Gone");
+ break;
+ case 411:
+ mStatusText.AssignLiteral("Length Required");
+ break;
+ case 412:
+ mStatusText.AssignLiteral("Precondition Failed");
+ break;
+ case 413:
+ mStatusText.AssignLiteral("Request Entity Too Large");
+ break;
+ case 414:
+ mStatusText.AssignLiteral("Request URI Too Long");
+ break;
+ case 415:
+ mStatusText.AssignLiteral("Unsupported Media Type");
+ break;
+ case 416:
+ mStatusText.AssignLiteral("Requested Range Not Satisfiable");
+ break;
+ case 417:
+ mStatusText.AssignLiteral("Expectation Failed");
+ break;
+ case 418:
+ mStatusText.AssignLiteral("I'm a teapot");
+ break;
+ case 421:
+ mStatusText.AssignLiteral("Misdirected Request");
+ break;
+ case 422:
+ mStatusText.AssignLiteral("Unprocessable Entity");
+ break;
+ case 423:
+ mStatusText.AssignLiteral("Locked");
+ break;
+ case 424:
+ mStatusText.AssignLiteral("Failed Dependency");
+ break;
+ case 425:
+ mStatusText.AssignLiteral("Too Early");
+ break;
+ case 426:
+ mStatusText.AssignLiteral("Upgrade Required");
+ break;
+ case 428:
+ mStatusText.AssignLiteral("Precondition Required");
+ break;
+ case 429:
+ mStatusText.AssignLiteral("Too Many Requests");
+ break;
+ case 431:
+ mStatusText.AssignLiteral("Request Header Fields Too Large");
+ break;
+ case 451:
+ mStatusText.AssignLiteral("Unavailable For Legal Reasons");
+ break;
+ case 501:
+ mStatusText.AssignLiteral("Not Implemented");
+ break;
+ case 502:
+ mStatusText.AssignLiteral("Bad Gateway");
+ break;
+ case 503:
+ mStatusText.AssignLiteral("Service Unavailable");
+ break;
+ case 504:
+ mStatusText.AssignLiteral("Gateway Timeout");
+ break;
+ case 505:
+ mStatusText.AssignLiteral("HTTP Version Unsupported");
+ break;
+ case 506:
+ mStatusText.AssignLiteral("Variant Also Negotiates");
+ break;
+ case 507:
+ mStatusText.AssignLiteral("Insufficient Storage ");
+ break;
+ case 508:
+ mStatusText.AssignLiteral("Loop Detected");
+ break;
+ case 510:
+ mStatusText.AssignLiteral("Not Extended");
+ break;
+ case 511:
+ mStatusText.AssignLiteral("Network Authentication Required");
+ break;
+ default:
+ mStatusText.AssignLiteral("No Reason Phrase");
+ break;
+ }
+}
+
+void nsHttpResponseHead::ParseStatusLine(const nsACString& line) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ ParseStatusLine_locked(line);
+}
+
+void nsHttpResponseHead::ParseStatusLine_locked(const nsACString& line) {
+ //
+ // Parse Status-Line:: HTTP-Version SP Status-Code SP Reason-Phrase CRLF
+ //
+
+ const char* start = line.BeginReading();
+ const char* end = line.EndReading();
+ const char* p = start;
+
+ // HTTP-Version
+ ParseVersion(start);
+
+ int32_t index = line.FindChar(' ');
+
+ if ((mVersion == HttpVersion::v0_9) || (index == -1)) {
+ mStatus = 200;
+ AssignDefaultStatusText();
+ } else {
+ // Status-Code
+ p += index + 1;
+ mStatus = (uint16_t)atoi(p);
+ if (mStatus == 0) {
+ LOG(("mal-formed response status; assuming status = 200\n"));
+ mStatus = 200;
+ }
+
+ // Reason-Phrase is whatever is remaining of the line
+ index = line.FindChar(' ', p - start);
+ if (index == -1) {
+ AssignDefaultStatusText();
+ } else {
+ p = start + index + 1;
+ mStatusText = nsDependentCSubstring(p, end - p);
+ }
+ }
+
+ LOG1(("Have status line [version=%u status=%u statusText=%s]\n",
+ unsigned(mVersion), unsigned(mStatus), mStatusText.get()));
+}
+
+nsresult nsHttpResponseHead::ParseHeaderLine(const nsACString& line) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return ParseHeaderLine_locked(line, true);
+}
+
+nsresult nsHttpResponseHead::ParseHeaderLine_locked(
+ const nsACString& line, bool originalFromNetHeaders) {
+ nsHttpAtom hdr;
+ nsAutoCString headerNameOriginal;
+ nsAutoCString val;
+
+ if (NS_FAILED(nsHttpHeaderArray::ParseHeaderLine(
+ line, &hdr, &headerNameOriginal, &val))) {
+ return NS_OK;
+ }
+ nsresult rv;
+ if (originalFromNetHeaders) {
+ rv = mHeaders.SetHeaderFromNet(hdr, headerNameOriginal, val, true);
+ } else {
+ rv = mHeaders.SetResponseHeaderFromCache(
+ hdr, headerNameOriginal, val, nsHttpHeaderArray::eVarietyResponse);
+ }
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // leading and trailing LWS has been removed from |val|
+
+ // handle some special case headers...
+ if (hdr == nsHttp::Content_Length) {
+ rv = ParseResponseContentLength(val);
+ if (rv == NS_ERROR_ILLEGAL_VALUE) {
+ LOG(("illegal content-length! %s\n", val.get()));
+ return rv;
+ }
+
+ if (rv == NS_ERROR_NOT_AVAILABLE) {
+ LOG(("content-length value ignored! %s\n", val.get()));
+ }
+
+ } else if (hdr == nsHttp::Content_Type) {
+ LOG(("ParseContentType [type=%s]\n", val.get()));
+ bool dummy;
+ net_ParseContentType(val, mContentType, mContentCharset, &dummy);
+ } else if (hdr == nsHttp::Cache_Control) {
+ ParseCacheControl(val.get());
+ } else if (hdr == nsHttp::Pragma) {
+ ParsePragma(val.get());
+ }
+ return NS_OK;
+}
+
+// From section 13.2.3 of RFC2616, we compute the current age of a cached
+// response as follows:
+//
+// currentAge = max(max(0, responseTime - dateValue), ageValue)
+// + now - requestTime
+//
+// where responseTime == now
+//
+// This is typically a very small number.
+//
+nsresult nsHttpResponseHead::ComputeCurrentAge(uint32_t now,
+ uint32_t requestTime,
+ uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ uint32_t dateValue;
+ uint32_t ageValue;
+
+ *result = 0;
+
+ if (requestTime > now) {
+ // for calculation purposes lets not allow the request to happen in the
+ // future
+ requestTime = now;
+ }
+
+ if (NS_FAILED(GetDateValue_locked(&dateValue))) {
+ LOG(
+ ("nsHttpResponseHead::ComputeCurrentAge [this=%p] "
+ "Date response header not set!\n",
+ this));
+ // Assume we have a fast connection and that our clock
+ // is in sync with the server.
+ dateValue = now;
+ }
+
+ // Compute apparent age
+ if (now > dateValue) *result = now - dateValue;
+
+ // Compute corrected received age
+ if (NS_SUCCEEDED(GetAgeValue_locked(&ageValue))) {
+ *result = std::max(*result, ageValue);
+ }
+
+ // Compute current age
+ *result += (now - requestTime);
+ return NS_OK;
+}
+
+// From section 13.2.4 of RFC2616, we compute the freshness lifetime of a cached
+// response as follows:
+//
+// freshnessLifetime = max_age_value
+// <or>
+// freshnessLifetime = expires_value - date_value
+// <or>
+// freshnessLifetime = min(one-week,
+// (date_value - last_modified_value) * 0.10)
+// <or>
+// freshnessLifetime = 0
+//
+nsresult nsHttpResponseHead::ComputeFreshnessLifetime(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ *result = 0;
+
+ // Try HTTP/1.1 style max-age directive...
+ if (NS_SUCCEEDED(GetMaxAgeValue_locked(result))) return NS_OK;
+
+ *result = 0;
+
+ uint32_t date = 0, date2 = 0;
+ if (NS_FAILED(GetDateValue_locked(&date))) {
+ date = NowInSeconds(); // synthesize a date header if none exists
+ }
+
+ // Try HTTP/1.0 style expires header...
+ if (NS_SUCCEEDED(GetExpiresValue_locked(&date2))) {
+ if (date2 > date) *result = date2 - date;
+ // the Expires header can specify a date in the past.
+ return NS_OK;
+ }
+
+ // These responses can be cached indefinitely.
+ if ((mStatus == 300) || (mStatus == 410) ||
+ nsHttp::IsPermanentRedirect(mStatus)) {
+ LOG(
+ ("nsHttpResponseHead::ComputeFreshnessLifetime [this = %p] "
+ "Assign an infinite heuristic lifetime\n",
+ this));
+ *result = uint32_t(-1);
+ return NS_OK;
+ }
+
+ if (mStatus >= 400) {
+ LOG(
+ ("nsHttpResponseHead::ComputeFreshnessLifetime [this = %p] "
+ "Do not calculate heuristic max-age for most responses >= 400\n",
+ this));
+ return NS_OK;
+ }
+
+ // From RFC 7234 Section 4.2.2, heuristics can only be used on responses
+ // without explicit freshness whose status codes are defined as cacheable
+ // by default, and those responses without explicit freshness that have been
+ // marked as explicitly cacheable.
+ // Note that |MustValidate| handled most of non-cacheable status codes.
+ if ((mStatus == 302 || mStatus == 304 || mStatus == 307) &&
+ !mCacheControlPublic && !mCacheControlPrivate) {
+ LOG((
+ "nsHttpResponseHead::ComputeFreshnessLifetime [this = %p] "
+ "Do not calculate heuristic max-age for non-cacheable status code %u\n",
+ this, unsigned(mStatus)));
+ return NS_OK;
+ }
+
+ // Fallback on heuristic using last modified header...
+ if (NS_SUCCEEDED(GetLastModifiedValue_locked(&date2))) {
+ LOG(("using last-modified to determine freshness-lifetime\n"));
+ LOG(("last-modified = %u, date = %u\n", date2, date));
+ if (date2 <= date) {
+ // this only makes sense if last-modified is actually in the past
+ *result = (date - date2) / 10;
+ const uint32_t kOneWeek = 60 * 60 * 24 * 7;
+ *result = std::min(kOneWeek, *result);
+ return NS_OK;
+ }
+ }
+
+ LOG(
+ ("nsHttpResponseHead::ComputeFreshnessLifetime [this = %p] "
+ "Insufficient information to compute a non-zero freshness "
+ "lifetime!\n",
+ this));
+
+ return NS_OK;
+}
+
+bool nsHttpResponseHead::MustValidate() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ LOG(("nsHttpResponseHead::MustValidate ??\n"));
+
+ // Some response codes are cacheable, but the rest are not. This switch should
+ // stay in sync with the list in nsHttpChannel::ContinueProcessResponse3
+ switch (mStatus) {
+ // Success codes
+ case 200:
+ case 203:
+ case 204:
+ case 206:
+ // Cacheable redirects
+ case 300:
+ case 301:
+ case 302:
+ case 304:
+ case 307:
+ case 308:
+ // Gone forever
+ case 410:
+ break;
+ // Uncacheable redirects
+ case 303:
+ case 305:
+ // Other known errors
+ case 401:
+ case 407:
+ case 412:
+ case 416:
+ case 425:
+ case 429:
+ default: // revalidate unknown error pages
+ LOG(("Must validate since response is an uncacheable error page\n"));
+ return true;
+ }
+
+ // The no-cache response header indicates that we must validate this
+ // cached response before reusing.
+ if (NoCache_locked()) {
+ LOG(("Must validate since response contains 'no-cache' header\n"));
+ return true;
+ }
+
+ // Likewise, if the response is no-store, then we must validate this
+ // cached response before reusing. NOTE: it may seem odd that a no-store
+ // response may be cached, but indeed all responses are cached in order
+ // to support File->SaveAs, View->PageSource, and other browser features.
+ if (mCacheControlNoStore) {
+ LOG(("Must validate since response contains 'no-store' header\n"));
+ return true;
+ }
+
+ // Compare the Expires header to the Date header. If the server sent an
+ // Expires header with a timestamp in the past, then we must validate this
+ // cached response before reusing.
+ if (ExpiresInPast_locked()) {
+ LOG(("Must validate since Expires < Date\n"));
+ return true;
+ }
+
+ LOG(("no mandatory validation requirement\n"));
+ return false;
+}
+
+bool nsHttpResponseHead::MustValidateIfExpired() {
+ // according to RFC2616, section 14.9.4:
+ //
+ // When the must-revalidate directive is present in a response received by a
+ // cache, that cache MUST NOT use the entry after it becomes stale to respond
+ // to a subsequent request without first revalidating it with the origin
+ // server.
+ //
+ return HasHeaderValue(nsHttp::Cache_Control, "must-revalidate");
+}
+
+bool nsHttpResponseHead::StaleWhileRevalidate(uint32_t now,
+ uint32_t expiration) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ if (expiration <= 0 || !mCacheControlStaleWhileRevalidateSet) {
+ return false;
+ }
+
+ // 'expiration' is the expiration time (an absolute unit), the swr window
+ // extends the expiration time.
+ CheckedInt<uint32_t> stallValidUntil = expiration;
+ stallValidUntil += mCacheControlStaleWhileRevalidate;
+ if (!stallValidUntil.isValid()) {
+ // overflow means an indefinite stale window
+ return true;
+ }
+
+ return now <= stallValidUntil.value();
+}
+
+bool nsHttpResponseHead::IsResumable() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ // even though some HTTP/1.0 servers may support byte range requests, we're
+ // not going to bother with them, since those servers wouldn't understand
+ // If-Range. Also, while in theory it may be possible to resume when the
+ // status code is not 200, it is unlikely to be worth the trouble, especially
+ // for non-2xx responses.
+ return mStatus == 200 && mVersion >= HttpVersion::v1_1 &&
+ mHeaders.PeekHeader(nsHttp::Content_Length) &&
+ (mHeaders.PeekHeader(nsHttp::ETag) ||
+ mHeaders.PeekHeader(nsHttp::Last_Modified)) &&
+ mHeaders.HasHeaderValue(nsHttp::Accept_Ranges, "bytes");
+}
+
+bool nsHttpResponseHead::ExpiresInPast() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return ExpiresInPast_locked();
+}
+
+bool nsHttpResponseHead::ExpiresInPast_locked() const {
+ uint32_t maxAgeVal, expiresVal, dateVal;
+
+ // Bug #203271. Ensure max-age directive takes precedence over Expires
+ if (NS_SUCCEEDED(GetMaxAgeValue_locked(&maxAgeVal))) {
+ return false;
+ }
+
+ return NS_SUCCEEDED(GetExpiresValue_locked(&expiresVal)) &&
+ NS_SUCCEEDED(GetDateValue_locked(&dateVal)) && expiresVal < dateVal;
+}
+
+void nsHttpResponseHead::UpdateHeaders(nsHttpResponseHead* aOther) {
+ LOG(("nsHttpResponseHead::UpdateHeaders [this=%p]\n", this));
+
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ RecursiveMutexAutoLock monitorOther(aOther->mRecursiveMutex);
+
+ uint32_t i, count = aOther->mHeaders.Count();
+ for (i = 0; i < count; ++i) {
+ nsHttpAtom header;
+ nsAutoCString headerNameOriginal;
+
+ if (!aOther->mHeaders.PeekHeaderAt(i, header, headerNameOriginal)) {
+ continue;
+ }
+
+ nsAutoCString val;
+ if (NS_FAILED(aOther->GetHeader(header, val))) {
+ continue;
+ }
+
+ // Ignore any hop-by-hop headers...
+ if (header == nsHttp::Connection || header == nsHttp::Proxy_Connection ||
+ header == nsHttp::Keep_Alive || header == nsHttp::Proxy_Authenticate ||
+ header == nsHttp::Proxy_Authorization || // not a response header!
+ header == nsHttp::TE || header == nsHttp::Trailer ||
+ header == nsHttp::Transfer_Encoding || header == nsHttp::Upgrade ||
+ // Ignore any non-modifiable headers...
+ header == nsHttp::Content_Location || header == nsHttp::Content_MD5 ||
+ header == nsHttp::ETag ||
+ // Assume Cache-Control: "no-transform"
+ header == nsHttp::Content_Encoding || header == nsHttp::Content_Range ||
+ header == nsHttp::Content_Type ||
+ // Ignore wacky headers too...
+ // this one is for MS servers that send "Content-Length: 0"
+ // on 304 responses
+ header == nsHttp::Content_Length) {
+ LOG(("ignoring response header [%s: %s]\n", header.get(), val.get()));
+ } else {
+ LOG(("new response header [%s: %s]\n", header.get(), val.get()));
+
+ // overwrite the current header value with the new value...
+ DebugOnly<nsresult> rv =
+ SetHeader_locked(header, headerNameOriginal, val);
+ MOZ_ASSERT(NS_SUCCEEDED(rv));
+ }
+ }
+}
+
+void nsHttpResponseHead::Reset() {
+ LOG(("nsHttpResponseHead::Reset\n"));
+
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+
+ mHeaders.Clear();
+
+ mVersion = HttpVersion::v1_1;
+ mStatus = 200;
+ mContentLength = -1;
+ mHasCacheControl = false;
+ mCacheControlPublic = false;
+ mCacheControlPrivate = false;
+ mCacheControlNoStore = false;
+ mCacheControlNoCache = false;
+ mCacheControlImmutable = false;
+ mCacheControlStaleWhileRevalidateSet = false;
+ mCacheControlStaleWhileRevalidate = 0;
+ mCacheControlMaxAgeSet = false;
+ mCacheControlMaxAge = 0;
+ mPragmaNoCache = false;
+ mStatusText.Truncate();
+ mContentType.Truncate();
+ mContentCharset.Truncate();
+}
+
+nsresult nsHttpResponseHead::ParseDateHeader(const nsHttpAtom& header,
+ uint32_t* result) const {
+ const char* val = mHeaders.PeekHeader(header);
+ if (!val) return NS_ERROR_NOT_AVAILABLE;
+
+ PRTime time;
+ PRStatus st = PR_ParseTimeString(val, true, &time);
+ if (st != PR_SUCCESS) return NS_ERROR_NOT_AVAILABLE;
+
+ *result = PRTimeToSeconds(time);
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::GetAgeValue(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return GetAgeValue_locked(result);
+}
+
+nsresult nsHttpResponseHead::GetAgeValue_locked(uint32_t* result) const {
+ const char* val = mHeaders.PeekHeader(nsHttp::Age);
+ if (!val) return NS_ERROR_NOT_AVAILABLE;
+
+ *result = (uint32_t)atoi(val);
+ return NS_OK;
+}
+
+// Return the value of the (HTTP 1.1) max-age directive, which itself is a
+// component of the Cache-Control response header
+nsresult nsHttpResponseHead::GetMaxAgeValue(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return GetMaxAgeValue_locked(result);
+}
+
+nsresult nsHttpResponseHead::GetMaxAgeValue_locked(uint32_t* result) const {
+ if (!mCacheControlMaxAgeSet) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ *result = mCacheControlMaxAge;
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::GetDateValue(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return GetDateValue_locked(result);
+}
+
+nsresult nsHttpResponseHead::GetExpiresValue(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return GetExpiresValue_locked(result);
+}
+
+nsresult nsHttpResponseHead::GetExpiresValue_locked(uint32_t* result) const {
+ const char* val = mHeaders.PeekHeader(nsHttp::Expires);
+ if (!val) return NS_ERROR_NOT_AVAILABLE;
+
+ PRTime time;
+ PRStatus st = PR_ParseTimeString(val, true, &time);
+ if (st != PR_SUCCESS) {
+ // parsing failed... RFC 2616 section 14.21 says we should treat this
+ // as an expiration time in the past.
+ *result = 0;
+ return NS_OK;
+ }
+
+ if (time < 0) {
+ *result = 0;
+ } else {
+ *result = PRTimeToSeconds(time);
+ }
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::GetLastModifiedValue(uint32_t* result) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return ParseDateHeader(nsHttp::Last_Modified, result);
+}
+
+bool nsHttpResponseHead::operator==(const nsHttpResponseHead& aOther) const
+ MOZ_NO_THREAD_SAFETY_ANALYSIS {
+ nsHttpResponseHead& curr = const_cast<nsHttpResponseHead&>(*this);
+ nsHttpResponseHead& other = const_cast<nsHttpResponseHead&>(aOther);
+ RecursiveMutexAutoLock monitorOther(other.mRecursiveMutex);
+ RecursiveMutexAutoLock monitor(curr.mRecursiveMutex);
+
+ return mHeaders == aOther.mHeaders && mVersion == aOther.mVersion &&
+ mStatus == aOther.mStatus && mStatusText == aOther.mStatusText &&
+ mContentLength == aOther.mContentLength &&
+ mContentType == aOther.mContentType &&
+ mContentCharset == aOther.mContentCharset &&
+ mHasCacheControl == aOther.mHasCacheControl &&
+ mCacheControlPublic == aOther.mCacheControlPublic &&
+ mCacheControlPrivate == aOther.mCacheControlPrivate &&
+ mCacheControlNoCache == aOther.mCacheControlNoCache &&
+ mCacheControlNoStore == aOther.mCacheControlNoStore &&
+ mCacheControlImmutable == aOther.mCacheControlImmutable &&
+ mCacheControlStaleWhileRevalidateSet ==
+ aOther.mCacheControlStaleWhileRevalidateSet &&
+ mCacheControlStaleWhileRevalidate ==
+ aOther.mCacheControlStaleWhileRevalidate &&
+ mCacheControlMaxAgeSet == aOther.mCacheControlMaxAgeSet &&
+ mCacheControlMaxAge == aOther.mCacheControlMaxAge &&
+ mPragmaNoCache == aOther.mPragmaNoCache;
+}
+
+int64_t nsHttpResponseHead::TotalEntitySize() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ const char* contentRange = mHeaders.PeekHeader(nsHttp::Content_Range);
+ if (!contentRange) return mContentLength;
+
+ // Total length is after a slash
+ const char* slash = strrchr(contentRange, '/');
+ if (!slash) return -1; // No idea what the length is
+
+ slash++;
+ if (*slash == '*') { // Server doesn't know the length
+ return -1;
+ }
+
+ int64_t size;
+ if (!nsHttp::ParseInt64(slash, &size)) size = UINT64_MAX;
+ return size;
+}
+
+//-----------------------------------------------------------------------------
+// nsHttpResponseHead <private>
+//-----------------------------------------------------------------------------
+
+void nsHttpResponseHead::ParseVersion(const char* str) {
+ // Parse HTTP-Version:: "HTTP" "/" 1*DIGIT "." 1*DIGIT
+
+ LOG(("nsHttpResponseHead::ParseVersion [version=%s]\n", str));
+
+ Tokenizer t(str, nullptr, "");
+ // make sure we have HTTP at the beginning
+ if (!t.CheckWord("HTTP")) {
+ if (nsCRT::strncasecmp(str, "ICY ", 4) == 0) {
+ // ShoutCast ICY is HTTP/1.0-like. Assume it is HTTP/1.0.
+ LOG(("Treating ICY as HTTP 1.0\n"));
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+ LOG(("looks like a HTTP/0.9 response\n"));
+ mVersion = HttpVersion::v0_9;
+ return;
+ }
+
+ if (!t.CheckChar('/')) {
+ LOG(("server did not send a version number; assuming HTTP/1.0\n"));
+ // NCSA/1.5.2 has a bug in which it fails to send a version number
+ // if the request version is HTTP/1.1, so we fall back on HTTP/1.0
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+
+ uint32_t major;
+ if (!t.ReadInteger(&major)) {
+ LOG(("server did not send a correct version number; assuming HTTP/1.0"));
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+
+ if (major == 3) {
+ mVersion = HttpVersion::v3_0;
+ return;
+ }
+
+ if (major == 2) {
+ mVersion = HttpVersion::v2_0;
+ return;
+ }
+
+ if (major != 1) {
+ LOG(("server did not send a correct version number; assuming HTTP/1.0"));
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+
+ if (!t.CheckChar('.')) {
+ LOG(("mal-formed server version; assuming HTTP/1.0\n"));
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+
+ uint32_t minor;
+ if (!t.ReadInteger(&minor)) {
+ LOG(("server did not send a correct version number; assuming HTTP/1.0"));
+ mVersion = HttpVersion::v1_0;
+ return;
+ }
+
+ if (minor >= 1) {
+ // at least HTTP/1.1
+ mVersion = HttpVersion::v1_1;
+ } else {
+ // treat anything else as version 1.0
+ mVersion = HttpVersion::v1_0;
+ }
+}
+
+void nsHttpResponseHead::ParseCacheControl(const char* val) {
+ if (!(val && *val)) {
+ // clear flags
+ mHasCacheControl = false;
+ mCacheControlPublic = false;
+ mCacheControlPrivate = false;
+ mCacheControlNoCache = false;
+ mCacheControlNoStore = false;
+ mCacheControlImmutable = false;
+ mCacheControlStaleWhileRevalidateSet = false;
+ mCacheControlStaleWhileRevalidate = 0;
+ mCacheControlMaxAgeSet = false;
+ mCacheControlMaxAge = 0;
+ return;
+ }
+
+ nsDependentCString cacheControlRequestHeader(val);
+ CacheControlParser cacheControlRequest(cacheControlRequestHeader);
+
+ mHasCacheControl = true;
+ mCacheControlPublic = cacheControlRequest.Public();
+ mCacheControlPrivate = cacheControlRequest.Private();
+ mCacheControlNoCache = cacheControlRequest.NoCache();
+ mCacheControlNoStore = cacheControlRequest.NoStore();
+ mCacheControlImmutable = cacheControlRequest.Immutable();
+ mCacheControlStaleWhileRevalidateSet =
+ cacheControlRequest.StaleWhileRevalidate(
+ &mCacheControlStaleWhileRevalidate);
+ mCacheControlMaxAgeSet = cacheControlRequest.MaxAge(&mCacheControlMaxAge);
+}
+
+void nsHttpResponseHead::ParsePragma(const char* val) {
+ LOG(("nsHttpResponseHead::ParsePragma [val=%s]\n", val));
+
+ if (!(val && *val)) {
+ // clear no-cache flag
+ mPragmaNoCache = false;
+ return;
+ }
+
+ // Although 'Pragma: no-cache' is not a standard HTTP response header (it's a
+ // request header), caching is inhibited when this header is present so as to
+ // match existing Navigator behavior.
+ mPragmaNoCache = nsHttp::FindToken(val, "no-cache", HTTP_HEADER_VALUE_SEPS);
+}
+
+nsresult nsHttpResponseHead::ParseResponseContentLength(
+ const nsACString& aHeaderStr) {
+ int64_t contentLength = 0;
+ // Ref: https://fetch.spec.whatwg.org/#content-length-header
+ // Step 1. Let values be the result of getting, decoding, and splitting
+ // `Content - Length` from headers.
+ // Step 1 is done by the caller
+ // Step 2. If values is null, then return null.
+ if (aHeaderStr.IsEmpty()) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // Step 3 Let candidateValue be null.
+ Maybe<nsAutoCString> candidateValue;
+ // Step 4 For each value of values
+ for (const nsACString& token :
+ nsCCharSeparatedTokenizerTemplate<
+ NS_IsAsciiWhitespace, nsTokenizerFlags::IncludeEmptyTokenAtEnd>(
+ aHeaderStr, ',')
+ .ToRange()) {
+ // Step 4.1 If candidateValue is null, then set candidateValue to value.
+ if (candidateValue.isNothing()) {
+ candidateValue.emplace(token);
+ }
+ // Step 4.2 Otherwise, if value is not candidateValue, return failure.
+ if (candidateValue.value() != token) {
+ return NS_ERROR_ILLEGAL_VALUE;
+ }
+ }
+ // Step 5 If candidateValue is the empty string or has a code point that is
+ // not an ASCII digit, then return null.
+ if (candidateValue.isNothing()) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ // Step 6 Return candidateValue, interpreted as decimal number contentLength
+ const char* end = nullptr;
+ if (!net::nsHttp::ParseInt64(candidateValue->get(), &end, &contentLength)) {
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ if (*end != '\0') {
+ // a number was parsed by ParseInt64 but candidateValue contains non-numeric
+ // characters
+ return NS_ERROR_NOT_AVAILABLE;
+ }
+
+ mContentLength = contentLength;
+ return NS_OK;
+}
+
+nsresult nsHttpResponseHead::VisitHeaders(
+ nsIHttpHeaderVisitor* visitor, nsHttpHeaderArray::VisitorFilter filter) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mInVisitHeaders = true;
+ nsresult rv = mHeaders.VisitHeaders(visitor, filter);
+ mInVisitHeaders = false;
+ return rv;
+}
+
+namespace {
+class ContentTypeOptionsVisitor final : public nsIHttpHeaderVisitor {
+ public:
+ NS_DECL_ISUPPORTS
+
+ ContentTypeOptionsVisitor() = default;
+
+ NS_IMETHOD
+ VisitHeader(const nsACString& aHeader, const nsACString& aValue) override {
+ if (!mHeaderPresent) {
+ mHeaderPresent = true;
+ } else {
+ // multiple XCTO headers in response, merge them
+ mContentTypeOptionsHeader.Append(", "_ns);
+ }
+ mContentTypeOptionsHeader.Append(aValue);
+ return NS_OK;
+ }
+
+ void GetMergedHeader(nsACString& aValue) {
+ aValue = mContentTypeOptionsHeader;
+ }
+
+ private:
+ ~ContentTypeOptionsVisitor() = default;
+ bool mHeaderPresent{false};
+ nsAutoCString mContentTypeOptionsHeader;
+};
+
+NS_IMPL_ISUPPORTS(ContentTypeOptionsVisitor, nsIHttpHeaderVisitor)
+} // namespace
+
+nsresult nsHttpResponseHead::GetOriginalHeader(const nsHttpAtom& aHeader,
+ nsIHttpHeaderVisitor* aVisitor) {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ mInVisitHeaders = true;
+ nsresult rv = mHeaders.GetOriginalHeader(aHeader, aVisitor);
+ mInVisitHeaders = false;
+ return rv;
+}
+
+bool nsHttpResponseHead::HasContentType() const {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return !mContentType.IsEmpty();
+}
+
+bool nsHttpResponseHead::HasContentCharset() {
+ RecursiveMutexAutoLock monitor(mRecursiveMutex);
+ return !mContentCharset.IsEmpty();
+}
+
+bool nsHttpResponseHead::GetContentTypeOptionsHeader(nsACString& aOutput) {
+ aOutput.Truncate();
+
+ nsAutoCString contentTypeOptionsHeader;
+ // We need to fetch original headers and manually merge them because empty
+ // header values are not retrieved with GetHeader. Ref - Bug 1819642
+ RefPtr<ContentTypeOptionsVisitor> visitor = new ContentTypeOptionsVisitor();
+ Unused << GetOriginalHeader(nsHttp::X_Content_Type_Options, visitor);
+ visitor->GetMergedHeader(contentTypeOptionsHeader);
+ if (contentTypeOptionsHeader.IsEmpty()) {
+ // if there is no XCTO header, then there is nothing to do.
+ return false;
+ }
+
+ // XCTO header might contain multiple values which are comma separated, so:
+ // a) let's skip all subsequent values
+ // e.g. " NoSniFF , foo " will be " NoSniFF "
+ int32_t idx = contentTypeOptionsHeader.Find(",");
+ if (idx >= 0) {
+ contentTypeOptionsHeader = Substring(contentTypeOptionsHeader, 0, idx);
+ }
+ // b) let's trim all surrounding whitespace
+ // e.g. " NoSniFF " -> "NoSniFF"
+ nsHttp::TrimHTTPWhitespace(contentTypeOptionsHeader,
+ contentTypeOptionsHeader);
+
+ aOutput.Assign(contentTypeOptionsHeader);
+ return true;
+}
+
+} // namespace net
+} // namespace mozilla