LibCore+LibHTTP: Move out the HTTP handler and add HTTPS

Author: https://github.com/alimpfard
Commit: 7670e5ccf0
Pull-request: https://github.com/SerenityOS/serenity/pull/1661
Reviewed-by: https://github.com/Dexesttp
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/itamar8910

Libraries/LibHTTP/HttpRequest.cpp

@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/StringBuilder.h>
+#include <LibHTTP/HttpJob.h>
+#include <LibHTTP/HttpRequest.h>
+
+namespace HTTP {
+
+HttpRequest::HttpRequest()
+{
+}
+
+HttpRequest::~HttpRequest()
+{
+}
+
+RefPtr<Core::NetworkJob> HttpRequest::schedule()
+{
+    auto job = HttpJob::construct(*this);
+    job->start();
+    return job;
+}
+
+String HttpRequest::method_name() const
+{
+    switch (m_method) {
+    case Method::GET:
+        return "GET";
+    case Method::HEAD:
+        return "HEAD";
+    case Method::POST:
+        return "POST";
+    default:
+        ASSERT_NOT_REACHED();
+    }
+}
+
+ByteBuffer HttpRequest::to_raw_request() const
+{
+    StringBuilder builder;
+    builder.append(method_name());
+    builder.append(' ');
+    builder.append(m_url.path());
+    builder.append(" HTTP/1.1\r\nHost: ");
+    builder.append(m_url.host());
+    builder.append("\r\nConnection: close\r\n\r\n");
+    return builder.to_byte_buffer();
+}
+
+Optional<HttpRequest> HttpRequest::from_raw_request(const ByteBuffer& raw_request)
+{
+    enum class State {
+        InMethod,
+        InResource,
+        InProtocol,
+        InHeaderName,
+        InHeaderValue,
+    };
+
+    State state { State::InMethod };
+    size_t index = 0;
+
+    auto peek = [&](int offset = 0) -> u8 {
+        if (index + offset >= raw_request.size())
+            return 0;
+        return raw_request[index + offset];
+    };
+
+    auto consume = [&]() -> u8 {
+        ASSERT(index < raw_request.size());
+        return raw_request[index++];
+    };
+
+    Vector<u8, 256> buffer;
+
+    String method;
+    String resource;
+    String protocol;
+    Vector<Header> headers;
+    Header current_header;
+
+    auto commit_and_advance_to = [&](auto& output, State new_state) {
+        output = String::copy(buffer);
+        buffer.clear();
+        state = new_state;
+    };
+
+    while (index < raw_request.size()) {
+        // FIXME: Figure out what the appropriate limitations should be.
+        if (buffer.size() > 65536)
+            return {};
+        switch (state) {
+        case State::InMethod:
+            if (peek() == ' ') {
+                consume();
+                commit_and_advance_to(method, State::InResource);
+                break;
+            }
+            buffer.append(consume());
+            break;
+        case State::InResource:
+            if (peek() == ' ') {
+                consume();
+                commit_and_advance_to(resource, State::InProtocol);
+                break;
+            }
+            buffer.append(consume());
+            break;
+        case State::InProtocol:
+            if (peek(0) == '\r' && peek(1) == '\n') {
+                consume();
+                consume();
+                commit_and_advance_to(protocol, State::InHeaderName);
+                break;
+            }
+            buffer.append(consume());
+            break;
+        case State::InHeaderName:
+            if (peek(0) == ':' && peek(1) == ' ') {
+                consume();
+                consume();
+                commit_and_advance_to(current_header.name, State::InHeaderValue);
+                break;
+            }
+            buffer.append(consume());
+            break;
+        case State::InHeaderValue:
+            if (peek(0) == '\r' && peek(1) == '\n') {
+                consume();
+                consume();
+                commit_and_advance_to(current_header.value, State::InHeaderName);
+                headers.append(move(current_header));
+                break;
+            }
+            buffer.append(consume());
+            break;
+        }
+    }
+
+    HttpRequest request;
+    if (method == "GET")
+        request.m_method = Method::GET;
+    else if (method == "HEAD")
+        request.m_method = Method::HEAD;
+    else if (method == "POST")
+        request.m_method = Method::POST;
+    else
+        return {};
+
+    request.m_resource = resource;
+    request.m_headers = move(headers);
+
+    return request;
+}
+
+}