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482 lines
19 KiB
C++
482 lines
19 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
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//
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// (C) Copyright IBM Corporation 2021
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//
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// Licensed under the MIT License (the "License"); you may not use this file except
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// in compliance with the License. You may obtain a copy of the License at
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//
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// http://opensource.org/licenses/MIT
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//
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#ifndef RAPIDJSON_URI_H_
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#define RAPIDJSON_URI_H_
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#include "internal/strfunc.h"
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#if defined(__clang__)
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RAPIDJSON_DIAG_PUSH
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RAPIDJSON_DIAG_OFF(c++98-compat)
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#elif defined(_MSC_VER)
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RAPIDJSON_DIAG_OFF(4512) // assignment operator could not be generated
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#endif
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RAPIDJSON_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////////
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// GenericUri
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template <typename ValueType, typename Allocator=CrtAllocator>
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class GenericUri {
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public:
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typedef typename ValueType::Ch Ch;
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#if RAPIDJSON_HAS_STDSTRING
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typedef std::basic_string<Ch> String;
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#endif
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//! Constructors
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GenericUri(Allocator* allocator = 0) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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}
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GenericUri(const Ch* uri, SizeType len, Allocator* allocator = 0) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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Parse(uri, len);
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}
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GenericUri(const Ch* uri, Allocator* allocator = 0) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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Parse(uri, internal::StrLen<Ch>(uri));
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}
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// Use with specializations of GenericValue
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template<typename T> GenericUri(const T& uri, Allocator* allocator = 0) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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const Ch* u = uri.template Get<const Ch*>(); // TypeHelper from document.h
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Parse(u, internal::StrLen<Ch>(u));
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}
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#if RAPIDJSON_HAS_STDSTRING
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GenericUri(const String& uri, Allocator* allocator = 0) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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Parse(uri.c_str(), internal::StrLen<Ch>(uri.c_str()));
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}
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#endif
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//! Copy constructor
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GenericUri(const GenericUri& rhs) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(), ownAllocator_() {
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*this = rhs;
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}
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//! Copy constructor
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GenericUri(const GenericUri& rhs, Allocator* allocator) : uri_(), base_(), scheme_(), auth_(), path_(), query_(), frag_(), allocator_(allocator), ownAllocator_() {
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*this = rhs;
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}
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//! Destructor.
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~GenericUri() {
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Free();
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RAPIDJSON_DELETE(ownAllocator_);
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}
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//! Assignment operator
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GenericUri& operator=(const GenericUri& rhs) {
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if (this != &rhs) {
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// Do not delete ownAllocator
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Free();
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Allocate(rhs.GetStringLength());
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auth_ = CopyPart(scheme_, rhs.scheme_, rhs.GetSchemeStringLength());
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path_ = CopyPart(auth_, rhs.auth_, rhs.GetAuthStringLength());
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query_ = CopyPart(path_, rhs.path_, rhs.GetPathStringLength());
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frag_ = CopyPart(query_, rhs.query_, rhs.GetQueryStringLength());
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base_ = CopyPart(frag_, rhs.frag_, rhs.GetFragStringLength());
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uri_ = CopyPart(base_, rhs.base_, rhs.GetBaseStringLength());
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CopyPart(uri_, rhs.uri_, rhs.GetStringLength());
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}
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return *this;
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}
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//! Getters
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// Use with specializations of GenericValue
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template<typename T> void Get(T& uri, Allocator& allocator) {
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uri.template Set<const Ch*>(this->GetString(), allocator); // TypeHelper from document.h
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}
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const Ch* GetString() const { return uri_; }
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SizeType GetStringLength() const { return uri_ == 0 ? 0 : internal::StrLen<Ch>(uri_); }
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const Ch* GetBaseString() const { return base_; }
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SizeType GetBaseStringLength() const { return base_ == 0 ? 0 : internal::StrLen<Ch>(base_); }
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const Ch* GetSchemeString() const { return scheme_; }
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SizeType GetSchemeStringLength() const { return scheme_ == 0 ? 0 : internal::StrLen<Ch>(scheme_); }
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const Ch* GetAuthString() const { return auth_; }
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SizeType GetAuthStringLength() const { return auth_ == 0 ? 0 : internal::StrLen<Ch>(auth_); }
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const Ch* GetPathString() const { return path_; }
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SizeType GetPathStringLength() const { return path_ == 0 ? 0 : internal::StrLen<Ch>(path_); }
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const Ch* GetQueryString() const { return query_; }
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SizeType GetQueryStringLength() const { return query_ == 0 ? 0 : internal::StrLen<Ch>(query_); }
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const Ch* GetFragString() const { return frag_; }
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SizeType GetFragStringLength() const { return frag_ == 0 ? 0 : internal::StrLen<Ch>(frag_); }
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#if RAPIDJSON_HAS_STDSTRING
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static String Get(const GenericUri& uri) { return String(uri.GetString(), uri.GetStringLength()); }
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static String GetBase(const GenericUri& uri) { return String(uri.GetBaseString(), uri.GetBaseStringLength()); }
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static String GetScheme(const GenericUri& uri) { return String(uri.GetSchemeString(), uri.GetSchemeStringLength()); }
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static String GetAuth(const GenericUri& uri) { return String(uri.GetAuthString(), uri.GetAuthStringLength()); }
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static String GetPath(const GenericUri& uri) { return String(uri.GetPathString(), uri.GetPathStringLength()); }
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static String GetQuery(const GenericUri& uri) { return String(uri.GetQueryString(), uri.GetQueryStringLength()); }
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static String GetFrag(const GenericUri& uri) { return String(uri.GetFragString(), uri.GetFragStringLength()); }
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#endif
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//! Equality operators
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bool operator==(const GenericUri& rhs) const {
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return Match(rhs, true);
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}
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bool operator!=(const GenericUri& rhs) const {
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return !Match(rhs, true);
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}
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bool Match(const GenericUri& uri, bool full = true) const {
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Ch* s1;
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Ch* s2;
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if (full) {
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s1 = uri_;
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s2 = uri.uri_;
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} else {
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s1 = base_;
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s2 = uri.base_;
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}
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if (s1 == s2) return true;
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if (s1 == 0 || s2 == 0) return false;
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return internal::StrCmp<Ch>(s1, s2) == 0;
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}
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//! Resolve this URI against another (base) URI in accordance with URI resolution rules.
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// See https://tools.ietf.org/html/rfc3986
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// Use for resolving an id or $ref with an in-scope id.
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// Returns a new GenericUri for the resolved URI.
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GenericUri Resolve(const GenericUri& baseuri, Allocator* allocator = 0) {
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GenericUri resuri;
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resuri.allocator_ = allocator;
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// Ensure enough space for combining paths
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resuri.Allocate(GetStringLength() + baseuri.GetStringLength() + 1); // + 1 for joining slash
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if (!(GetSchemeStringLength() == 0)) {
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// Use all of this URI
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resuri.auth_ = CopyPart(resuri.scheme_, scheme_, GetSchemeStringLength());
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resuri.path_ = CopyPart(resuri.auth_, auth_, GetAuthStringLength());
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resuri.query_ = CopyPart(resuri.path_, path_, GetPathStringLength());
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resuri.frag_ = CopyPart(resuri.query_, query_, GetQueryStringLength());
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resuri.RemoveDotSegments();
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} else {
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// Use the base scheme
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resuri.auth_ = CopyPart(resuri.scheme_, baseuri.scheme_, baseuri.GetSchemeStringLength());
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if (!(GetAuthStringLength() == 0)) {
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// Use this auth, path, query
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resuri.path_ = CopyPart(resuri.auth_, auth_, GetAuthStringLength());
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resuri.query_ = CopyPart(resuri.path_, path_, GetPathStringLength());
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resuri.frag_ = CopyPart(resuri.query_, query_, GetQueryStringLength());
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resuri.RemoveDotSegments();
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} else {
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// Use the base auth
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resuri.path_ = CopyPart(resuri.auth_, baseuri.auth_, baseuri.GetAuthStringLength());
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if (GetPathStringLength() == 0) {
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// Use the base path
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resuri.query_ = CopyPart(resuri.path_, baseuri.path_, baseuri.GetPathStringLength());
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if (GetQueryStringLength() == 0) {
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// Use the base query
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resuri.frag_ = CopyPart(resuri.query_, baseuri.query_, baseuri.GetQueryStringLength());
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} else {
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// Use this query
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resuri.frag_ = CopyPart(resuri.query_, query_, GetQueryStringLength());
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}
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} else {
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if (path_[0] == '/') {
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// Absolute path - use all of this path
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resuri.query_ = CopyPart(resuri.path_, path_, GetPathStringLength());
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resuri.RemoveDotSegments();
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} else {
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// Relative path - append this path to base path after base path's last slash
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size_t pos = 0;
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if (!(baseuri.GetAuthStringLength() == 0) && baseuri.GetPathStringLength() == 0) {
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resuri.path_[pos] = '/';
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pos++;
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}
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size_t lastslashpos = baseuri.GetPathStringLength();
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while (lastslashpos > 0) {
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if (baseuri.path_[lastslashpos - 1] == '/') break;
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lastslashpos--;
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}
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std::memcpy(&resuri.path_[pos], baseuri.path_, lastslashpos * sizeof(Ch));
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pos += lastslashpos;
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resuri.query_ = CopyPart(&resuri.path_[pos], path_, GetPathStringLength());
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resuri.RemoveDotSegments();
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}
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// Use this query
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resuri.frag_ = CopyPart(resuri.query_, query_, GetQueryStringLength());
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}
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}
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}
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// Always use this frag
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resuri.base_ = CopyPart(resuri.frag_, frag_, GetFragStringLength());
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// Re-constitute base_ and uri_
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resuri.SetBase();
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resuri.uri_ = resuri.base_ + resuri.GetBaseStringLength() + 1;
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resuri.SetUri();
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return resuri;
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}
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//! Get the allocator of this GenericUri.
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Allocator& GetAllocator() { return *allocator_; }
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private:
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// Allocate memory for a URI
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// Returns total amount allocated
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std::size_t Allocate(std::size_t len) {
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// Create own allocator if user did not supply.
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if (!allocator_)
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ownAllocator_ = allocator_ = RAPIDJSON_NEW(Allocator)();
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// Allocate one block containing each part of the URI (5) plus base plus full URI, all null terminated.
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// Order: scheme, auth, path, query, frag, base, uri
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// Note need to set, increment, assign in 3 stages to avoid compiler warning bug.
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size_t total = (3 * len + 7) * sizeof(Ch);
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scheme_ = static_cast<Ch*>(allocator_->Malloc(total));
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*scheme_ = '\0';
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auth_ = scheme_;
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auth_++;
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*auth_ = '\0';
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path_ = auth_;
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path_++;
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*path_ = '\0';
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query_ = path_;
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query_++;
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*query_ = '\0';
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frag_ = query_;
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frag_++;
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*frag_ = '\0';
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base_ = frag_;
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base_++;
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*base_ = '\0';
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uri_ = base_;
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uri_++;
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*uri_ = '\0';
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return total;
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}
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// Free memory for a URI
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void Free() {
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if (scheme_) {
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Allocator::Free(scheme_);
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scheme_ = 0;
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}
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}
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// Parse a URI into constituent scheme, authority, path, query, & fragment parts
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// Supports URIs that match regex ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))? as per
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// https://tools.ietf.org/html/rfc3986
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void Parse(const Ch* uri, std::size_t len) {
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std::size_t start = 0, pos1 = 0, pos2 = 0;
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Allocate(len);
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// Look for scheme ([^:/?#]+):)?
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if (start < len) {
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while (pos1 < len) {
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if (uri[pos1] == ':') break;
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pos1++;
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}
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if (pos1 != len) {
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while (pos2 < len) {
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if (uri[pos2] == '/') break;
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if (uri[pos2] == '?') break;
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if (uri[pos2] == '#') break;
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pos2++;
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}
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if (pos1 < pos2) {
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pos1++;
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std::memcpy(scheme_, &uri[start], pos1 * sizeof(Ch));
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scheme_[pos1] = '\0';
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start = pos1;
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}
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}
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}
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// Look for auth (//([^/?#]*))?
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// Note need to set, increment, assign in 3 stages to avoid compiler warning bug.
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auth_ = scheme_ + GetSchemeStringLength();
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auth_++;
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*auth_ = '\0';
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if (start < len - 1 && uri[start] == '/' && uri[start + 1] == '/') {
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pos2 = start + 2;
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while (pos2 < len) {
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if (uri[pos2] == '/') break;
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if (uri[pos2] == '?') break;
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if (uri[pos2] == '#') break;
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pos2++;
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}
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std::memcpy(auth_, &uri[start], (pos2 - start) * sizeof(Ch));
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auth_[pos2 - start] = '\0';
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start = pos2;
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}
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// Look for path ([^?#]*)
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// Note need to set, increment, assign in 3 stages to avoid compiler warning bug.
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path_ = auth_ + GetAuthStringLength();
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path_++;
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*path_ = '\0';
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if (start < len) {
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pos2 = start;
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while (pos2 < len) {
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if (uri[pos2] == '?') break;
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if (uri[pos2] == '#') break;
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pos2++;
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}
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if (start != pos2) {
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std::memcpy(path_, &uri[start], (pos2 - start) * sizeof(Ch));
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path_[pos2 - start] = '\0';
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if (path_[0] == '/')
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RemoveDotSegments(); // absolute path - normalize
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start = pos2;
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}
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}
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// Look for query (\?([^#]*))?
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// Note need to set, increment, assign in 3 stages to avoid compiler warning bug.
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query_ = path_ + GetPathStringLength();
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query_++;
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*query_ = '\0';
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if (start < len && uri[start] == '?') {
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pos2 = start + 1;
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while (pos2 < len) {
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if (uri[pos2] == '#') break;
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pos2++;
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}
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if (start != pos2) {
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std::memcpy(query_, &uri[start], (pos2 - start) * sizeof(Ch));
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query_[pos2 - start] = '\0';
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start = pos2;
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}
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}
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// Look for fragment (#(.*))?
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// Note need to set, increment, assign in 3 stages to avoid compiler warning bug.
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frag_ = query_ + GetQueryStringLength();
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frag_++;
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*frag_ = '\0';
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if (start < len && uri[start] == '#') {
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std::memcpy(frag_, &uri[start], (len - start) * sizeof(Ch));
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frag_[len - start] = '\0';
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}
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// Re-constitute base_ and uri_
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base_ = frag_ + GetFragStringLength() + 1;
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SetBase();
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uri_ = base_ + GetBaseStringLength() + 1;
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SetUri();
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}
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// Reconstitute base
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void SetBase() {
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Ch* next = base_;
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std::memcpy(next, scheme_, GetSchemeStringLength() * sizeof(Ch));
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next+= GetSchemeStringLength();
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std::memcpy(next, auth_, GetAuthStringLength() * sizeof(Ch));
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next+= GetAuthStringLength();
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std::memcpy(next, path_, GetPathStringLength() * sizeof(Ch));
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next+= GetPathStringLength();
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std::memcpy(next, query_, GetQueryStringLength() * sizeof(Ch));
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next+= GetQueryStringLength();
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*next = '\0';
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}
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// Reconstitute uri
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void SetUri() {
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Ch* next = uri_;
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std::memcpy(next, base_, GetBaseStringLength() * sizeof(Ch));
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next+= GetBaseStringLength();
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std::memcpy(next, frag_, GetFragStringLength() * sizeof(Ch));
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next+= GetFragStringLength();
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*next = '\0';
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}
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// Copy a part from one GenericUri to another
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// Return the pointer to the next part to be copied to
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Ch* CopyPart(Ch* to, Ch* from, std::size_t len) {
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RAPIDJSON_ASSERT(to != 0);
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RAPIDJSON_ASSERT(from != 0);
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std::memcpy(to, from, len * sizeof(Ch));
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to[len] = '\0';
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Ch* next = to + len + 1;
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return next;
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}
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// Remove . and .. segments from the path_ member.
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// https://tools.ietf.org/html/rfc3986
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// This is done in place as we are only removing segments.
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void RemoveDotSegments() {
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std::size_t pathlen = GetPathStringLength();
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std::size_t pathpos = 0; // Position in path_
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std::size_t newpos = 0; // Position in new path_
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// Loop through each segment in original path_
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while (pathpos < pathlen) {
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// Get next segment, bounded by '/' or end
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size_t slashpos = 0;
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while ((pathpos + slashpos) < pathlen) {
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if (path_[pathpos + slashpos] == '/') break;
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slashpos++;
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}
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// Check for .. and . segments
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if (slashpos == 2 && path_[pathpos] == '.' && path_[pathpos + 1] == '.') {
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// Backup a .. segment in the new path_
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// We expect to find a previously added slash at the end or nothing
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RAPIDJSON_ASSERT(newpos == 0 || path_[newpos - 1] == '/');
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size_t lastslashpos = newpos;
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// Make sure we don't go beyond the start segment
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if (lastslashpos > 1) {
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// Find the next to last slash and back up to it
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lastslashpos--;
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while (lastslashpos > 0) {
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if (path_[lastslashpos - 1] == '/') break;
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lastslashpos--;
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}
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// Set the new path_ position
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newpos = lastslashpos;
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}
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} else if (slashpos == 1 && path_[pathpos] == '.') {
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// Discard . segment, leaves new path_ unchanged
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} else {
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// Move any other kind of segment to the new path_
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RAPIDJSON_ASSERT(newpos <= pathpos);
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std::memmove(&path_[newpos], &path_[pathpos], slashpos * sizeof(Ch));
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newpos += slashpos;
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// Add slash if not at end
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if ((pathpos + slashpos) < pathlen) {
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path_[newpos] = '/';
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newpos++;
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}
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}
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// Move to next segment
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pathpos += slashpos + 1;
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}
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path_[newpos] = '\0';
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}
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Ch* uri_; // Everything
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Ch* base_; // Everything except fragment
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Ch* scheme_; // Includes the :
|
|
Ch* auth_; // Includes the //
|
|
Ch* path_; // Absolute if starts with /
|
|
Ch* query_; // Includes the ?
|
|
Ch* frag_; // Includes the #
|
|
|
|
Allocator* allocator_; //!< The current allocator. It is either user-supplied or equal to ownAllocator_.
|
|
Allocator* ownAllocator_; //!< Allocator owned by this Uri.
|
|
};
|
|
|
|
//! GenericUri for Value (UTF-8, default allocator).
|
|
typedef GenericUri<Value> Uri;
|
|
|
|
RAPIDJSON_NAMESPACE_END
|
|
|
|
#if defined(__clang__)
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#endif // RAPIDJSON_URI_H_
|