QHttpServerResponse: Extend the API

Add new API for HTTP headers manipulations.
Add QHttpServerResponse::write function which will
allow to write custom response objects in a future.

Fixes: QTBUG-76933
Change-Id: I744303be1b517c07f698c4a3dd2c4296f77e3b03
Reviewed-by: Tasuku Suzuki <tasuku.suzuki@tqcs.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

4 files changed, 264 insertions, 17 deletions

diff --git a/src/httpserver/qhttpserver.cpp b/src/httpserver/qhttpserver.cpp
index 5b9ed05..7cc91db 100644
--- a/src/httpserver/qhttpserver.cpp
+++ b/src/httpserver/qhttpserver.cpp
@@ -126,10 +126,7 @@ void QHttpServer::sendResponse(const QHttpServerResponse &response,
                                const QHttpServerRequest &request,
                                QTcpSocket *socket)
 {
-    auto responder = makeResponder(request, socket);
-    responder.write(response.data(),
-                    response.mimeType(),
-                    response.statusCode());
+    response.write(makeResponder(request, socket));
 }
 
 /*!
diff --git a/src/httpserver/qhttpserverresponse.cpp b/src/httpserver/qhttpserverresponse.cpp
index ca2e657..a7ba006 100644
--- a/src/httpserver/qhttpserverresponse.cpp
+++ b/src/httpserver/qhttpserverresponse.cpp
@@ -29,8 +29,9 @@
 
 #include <QtHttpServer/qhttpserverresponse.h>
 
-#include <private/qhttpserverresponse_p.h>
 #include <private/qhttpserverliterals_p.h>
+#include <private/qhttpserverresponse_p.h>
+#include <private/qhttpserverresponder_p.h>
 
 #include <QtCore/qfile.h>
 #include <QtCore/qjsondocument.h>
@@ -89,15 +90,16 @@ QHttpServerResponse::QHttpServerResponse(const QJsonArray &data)
 QHttpServerResponse::QHttpServerResponse(const QByteArray &mimeType,
                                          const QByteArray &data,
                                          const StatusCode status)
-    : QHttpServerResponse(new QHttpServerResponsePrivate{mimeType, data, status})
+    : QHttpServerResponse(mimeType,
+                          new QHttpServerResponsePrivate{data, status, {}})
 {
 }
 
 QHttpServerResponse::QHttpServerResponse(QByteArray &&mimeType,
                                          const QByteArray &data,
                                          const StatusCode status)
-    : QHttpServerResponse(
-            new QHttpServerResponsePrivate{std::move(mimeType), data, status})
+    : QHttpServerResponse(std::move(mimeType),
+                          new QHttpServerResponsePrivate{data, status, {}})
 {
 }
 
@@ -105,7 +107,8 @@ QHttpServerResponse::QHttpServerResponse(const QByteArray &mimeType,
                                          QByteArray &&data,
                                          const StatusCode status)
     : QHttpServerResponse(
-            new QHttpServerResponsePrivate{mimeType, std::move(data), status})
+            mimeType,
+            new QHttpServerResponsePrivate{std::move(data), status, {}})
 {
 }
 
@@ -113,8 +116,8 @@ QHttpServerResponse::QHttpServerResponse(QByteArray &&mimeType,
                                          QByteArray &&data,
                                          const StatusCode status)
     : QHttpServerResponse(
-            new QHttpServerResponsePrivate{std::move(mimeType), std::move(data),
-                                           status})
+            std::move(mimeType),
+            new QHttpServerResponsePrivate{std::move(data), status, {}})
 {
 }
 
@@ -133,27 +136,227 @@ QHttpServerResponse QHttpServerResponse::fromFile(const QString &fileName)
     return QHttpServerResponse(mimeType, data);
 }
 
-QHttpServerResponse::QHttpServerResponse(QHttpServerResponsePrivate *d)
+QHttpServerResponse::QHttpServerResponse(const QByteArray &mimeType,
+                                         QHttpServerResponsePrivate *d)
+    : d_ptr(d)
+{
+    setHeader(QHttpServerLiterals::contentTypeHeader(), mimeType);
+}
+
+QHttpServerResponse::QHttpServerResponse(QByteArray &&mimeType,
+                                         QHttpServerResponsePrivate *d)
     : d_ptr(d)
 {
+    setHeader(QHttpServerLiterals::contentTypeHeader(),
+              std::move(mimeType));
 }
 
+/*!
+    Returns response body.
+*/
 QByteArray QHttpServerResponse::data() const
 {
     Q_D(const QHttpServerResponse);
     return d->data;
 }
 
+QHttpServerResponse::StatusCode QHttpServerResponse::statusCode() const
+{
+    Q_D(const QHttpServerResponse);
+    return d->statusCode;
+}
+
+/*!
+    Returns HTTP "Content-Type" header.
+
+    \note Default value is "text/html"
+*/
 QByteArray QHttpServerResponse::mimeType() const
 {
     Q_D(const QHttpServerResponse);
-    return d->mimeType;
+    const auto res = d->headers.find(
+            QHttpServerLiterals::contentTypeHeader());
+    if (res == d->headers.end())
+        return QHttpServerLiterals::contentTypeTextHtml();
+
+    return res->second;
 }
 
-QHttpServerResponse::StatusCode QHttpServerResponse::statusCode() const
+/*!
+    Adds the HTTP header with name \a name and value \a value,
+    does not override any previously set headers.
+*/
+void QHttpServerResponse::addHeader(QByteArray &&name, QByteArray &&value)
+{
+    Q_D(QHttpServerResponse);
+    d->headers.emplace(std::move(name), std::move(value));
+}
+
+/*!
+    Adds the HTTP header with name \a name and value \a value,
+    does not override any previously set headers.
+*/
+void QHttpServerResponse::addHeader(QByteArray &&name, const QByteArray &value)
+{
+    Q_D(QHttpServerResponse);
+    d->headers.emplace(std::move(name), value);
+}
+
+/*!
+    Adds the HTTP header with name \a name and value \a value,
+    does not override any previously set headers.
+*/
+void QHttpServerResponse::addHeader(const QByteArray &name, QByteArray &&value)
+{
+    Q_D(QHttpServerResponse);
+    d->headers.emplace(name, std::move(value));
+}
+
+/*!
+    Adds the HTTP header with name \a name and value \a value,
+    does not override any previously set headers.
+*/
+void QHttpServerResponse::addHeader(const QByteArray &name, const QByteArray &value)
+{
+    Q_D(QHttpServerResponse);
+    d->headers.emplace(name, value);
+}
+
+void QHttpServerResponse::addHeaders(QHttpServerResponder::HeaderList headers)
+{
+    for (auto &&header : headers)
+        addHeader(header.first, header.second);
+}
+
+/*!
+    Removes the HTTP header with name \a name.
+*/
+void QHttpServerResponse::clearHeader(const QByteArray &name)
+{
+    Q_D(QHttpServerResponse);
+    d->headers.erase(name);
+}
+
+/*!
+    Removes all HTTP headers.
+*/
+void QHttpServerResponse::clearHeaders()
+{
+    Q_D(QHttpServerResponse);
+    d->headers.clear();
+}
+
+/*!
+    Sets the HTTP header with name \a name and value \a value,
+    overriding any previously set headers.
+*/
+void QHttpServerResponse::setHeader(QByteArray &&name, QByteArray &&value)
+{
+    Q_D(QHttpServerResponse);
+    clearHeader(name);
+    addHeader(std::move(name), std::move(value));
+}
+
+/*!
+    Sets the HTTP header with name \a name and value \a value,
+    overriding any previously set headers.
+*/
+void QHttpServerResponse::setHeader(QByteArray &&name, const QByteArray &value)
+{
+    Q_D(QHttpServerResponse);
+    clearHeader(name);
+    addHeader(std::move(name), value);
+}
+
+/*!
+    Sets the HTTP header with name \a name and value \a value,
+    overriding any previously set headers.
+*/
+void QHttpServerResponse::setHeader(const QByteArray &name, QByteArray &&value)
+{
+    Q_D(QHttpServerResponse);
+    clearHeader(name);
+    addHeader(name, std::move(value));
+}
+
+/*!
+    Sets the HTTP header with name \a name and value \a value,
+    overriding any previously set headers.
+*/
+void QHttpServerResponse::setHeader(const QByteArray &name, const QByteArray &value)
+{
+    Q_D(QHttpServerResponse);
+    clearHeader(name);
+    addHeader(name, value);
+}
+
+/*!
+    Sets the headers \a headers, overriding any previously set headers.
+*/
+void QHttpServerResponse::setHeaders(QHttpServerResponder::HeaderList headers)
+{
+    for (auto &&header : headers)
+        setHeader(header.first, header.second);
+}
+
+/*!
+    Returns true if the response contains an HTTP header with name \a name,
+    otherwise returns false.
+*/
+bool QHttpServerResponse::hasHeader(const QByteArray &header) const
 {
     Q_D(const QHttpServerResponse);
-    return d->statusCode;
+    return d->headers.find(header) != d->headers.end();
+}
+
+/*!
+    Returns true if the response contains an HTTP header with name \a name and
+    with value \a value, otherwise returns false.
+*/
+bool QHttpServerResponse::hasHeader(const QByteArray &name,
+                                    const QByteArray &value) const
+{
+    Q_D(const QHttpServerResponse);
+    auto range = d->headers.equal_range(name);
+
+    auto condition = [&value] (const std::pair<QByteArray, QByteArray> &pair) {
+        return pair.second == value;
+    };
+
+    return std::find_if(range.first, range.second, condition) != range.second;
+}
+
+/*!
+    Returns values of the HTTP header with name \a name
+*/
+QVector<QByteArray> QHttpServerResponse::headers(const QByteArray &name) const
+{
+    Q_D(const QHttpServerResponse);
+
+    QVector<QByteArray> results;
+    auto range = d->headers.equal_range(name);
+
+    for (auto it = range.first; it != range.second; ++it)
+        results.append(it->second);
+
+    return results;
+}
+
+/*!
+    Writes HTTP response into QHttpServerResponder \a responder.
+*/
+void QHttpServerResponse::write(QHttpServerResponder &&responder) const
+{
+    Q_D(const QHttpServerResponse);
+    responder.writeStatusLine(d->statusCode);
+
+    for (auto &&header : d->headers)
+        responder.writeHeader(header.first, header.second);
+
+    responder.writeHeader(QHttpServerLiterals::contentLengthHeader(),
+                          QByteArray::number(d->data.size()));
+
+    responder.writeBody(d->data);
 }
 
 QT_END_NAMESPACE
diff --git a/src/httpserver/qhttpserverresponse.h b/src/httpserver/qhttpserverresponse.h
index 73fa52d..9f5d3dd 100644
--- a/src/httpserver/qhttpserverresponse.h
+++ b/src/httpserver/qhttpserverresponse.h
@@ -86,8 +86,44 @@ public:
     QByteArray mimeType() const;
 
     StatusCode statusCode() const;
+
+    void addHeader(QByteArray &&name, QByteArray &&value);
+    void addHeader(QByteArray &&name, const QByteArray &value);
+    void addHeader(const QByteArray &name, QByteArray &&value);
+    void addHeader(const QByteArray &name, const QByteArray &value);
+
+    void addHeaders(QHttpServerResponder::HeaderList headers);
+
+    template<typename Container>
+    void addHeaders(const Container &headers)
+    {
+        for (const auto &header : headers)
+            addHeader(header.first, header.second);
+    }
+
+    void clearHeader(const QByteArray &name);
+    void clearHeaders();
+
+    void setHeader(QByteArray &&name, QByteArray &&value);
+    void setHeader(QByteArray &&name, const QByteArray &value);
+    void setHeader(const QByteArray &name, QByteArray &&value);
+    void setHeader(const QByteArray &name, const QByteArray &value);
+
+    void setHeaders(QHttpServerResponder::HeaderList headers);
+
+    bool hasHeader(const QByteArray &name) const;
+    bool hasHeader(const QByteArray &name, const QByteArray &value) const;
+
+    QVector<QByteArray> headers(const QByteArray &name) const;
+
+    virtual void write(QHttpServerResponder &&responder) const;
+
 private:
-    QHttpServerResponse(QHttpServerResponsePrivate *d);
+    QHttpServerResponse(const QByteArray &mimeType,
+                        QHttpServerResponsePrivate *d);
+
+    QHttpServerResponse(QByteArray &&mimeType,
+                        QHttpServerResponsePrivate *d);
 
     QScopedPointer<QHttpServerResponsePrivate> d_ptr;
 };
diff --git a/src/httpserver/qhttpserverresponse_p.h b/src/httpserver/qhttpserverresponse_p.h
index 021ed25..8b81ad0 100644
--- a/src/httpserver/qhttpserverresponse_p.h
+++ b/src/httpserver/qhttpserverresponse_p.h
@@ -44,14 +44,25 @@
 
 #include <QtHttpServer/qhttpserverresponse.h>
 
+#include <functional>
+#include <unordered_map>
+
 QT_BEGIN_NAMESPACE
 
 class QHttpServerResponsePrivate
 {
+    struct HashHelper {
+        std::size_t operator()(const QByteArray& key) const
+        {
+            return qHash(key.toLower());
+        }
+    };
+
 public:
-    QByteArray mimeType;
     QByteArray data;
     QHttpServerResponse::StatusCode statusCode;
+
+    std::unordered_multimap<QByteArray, QByteArray, HashHelper> headers;
 };
 
 QT_END_NAMESPACE