1 files changed, 141 insertions, 0 deletions

diff --git a/src/HTTP/UrlClient.h b/src/HTTP/UrlClient.h
new file mode 100644
index 000000000..42086a4f1
--- /dev/null
+++ b/src/HTTP/UrlClient.h
@@ -0,0 +1,141 @@
+
+// UrlClient.h
+
+// Declares the cUrlClient class for high-level URL interaction
+
+/*
+Options that can be set via the Options parameter to the cUrlClient calls:
+"MaxRedirects": The maximum number of allowed redirects before the client refuses a redirect with an error
+
+Behavior:
+- If a redirect is received, and redirection is allowed, the redirection is reported via OnRedirecting() callback
+and the request is restarted at the redirect URL, without reporting any of the redirect's headers nor body
+- If a redirect is received and redirection is not allowed (maximum redirection attempts have been reached),
+the OnRedirecting() callback is called with the redirect URL and then the request terminates with an OnError() callback,
+without reporting the redirect's headers nor body.
+*/
+
+
+
+
+
+#pragma once
+
+#include "../OSSupport/Network.h"
+
+
+
+
+
+class cUrlClient
+{
+public:
+	/** Callbacks that are used for progress and result reporting. */
+	class cCallbacks
+	{
+	public:
+		/** Called when the TCP connection is established. */
+		virtual void OnConnected(cTCPLink & a_Link) {};
+
+		/** Called for TLS connections, when the server certificate is received.
+		Return true to continue with the request, false to abort.
+		The default implementation does nothing and continues with the request.
+		TODO: The certificate parameter needs a representation! */
+		virtual bool OnCertificateReceived() { return true; }
+
+		/** Called after the entire request has been sent to the remote peer. */
+		virtual void OnRequestSent() {};
+
+		/** Called after the first line of the response is parsed, unless the response is an allowed redirect. */
+		virtual void OnStatusLine(const AString & a_HttpVersion, int a_StatusCode, const AString & a_Rest) {}
+
+		/** Called when a single HTTP header is received and parsed, unless the response is an allowed redirect
+		Called once for each incoming header. */
+		virtual void OnHeader(const AString & a_Key, const AString & a_Value) {};
+
+		/** Called when the HTTP headers have been fully parsed, unless the response is an allowed redirect.
+		There will be no more OnHeader() calls. */
+		virtual void OnHeadersFinished() {};
+
+		/** Called when the next fragment of the response body is received, unless the response is an allowed redirect.
+		This can be called multiple times, as data arrives over the network. */
+		virtual void OnBodyData(const void * a_Data, size_t a_Size) {};
+
+		/** Called after the response body has been fully reported by OnBody() calls, unless the response is an allowed redirect.
+		There will be no more OnBody() calls. */
+		virtual void OnBodyFinished() {};
+
+		/** Called when an asynchronous error is encountered. */
+		virtual void OnError(const AString & a_ErrorMsg) {};
+
+		/** Called when a redirect is to be followed.
+		This is called even if the redirecting is prohibited by the options; in such an event, this call will be
+		followed by OnError().
+		If a response indicates a redirect (and the request allows redirecting), the regular callbacks
+		OnStatusLine(), OnHeader(), OnHeadersFinished(), OnBodyData() and OnBodyFinished() are not called
+		for such a response; instead, the redirect is silently attempted. */
+		virtual void OnRedirecting(const AString & a_NewLocation) {};
+	};
+
+
+	/** Used for HTTP status codes. */
+	enum eHTTPStatus
+	{
+		HTTP_STATUS_OK                 = 200,
+		HTTP_STATUS_MULTIPLE_CHOICES   = 300,  // MAY have a redirect using the "Location" header
+		HTTP_STATUS_MOVED_PERMANENTLY  = 301,  // redirect using the "Location" header
+		HTTP_STATUS_FOUND              = 302,  // redirect using the "Location" header
+		HTTP_STATUS_SEE_OTHER          = 303,  // redirect using the "Location" header
+		HTTP_STATUS_TEMPORARY_REDIRECT = 307,  // redirect using the "Location" header
+	};
+
+
+	/** Makes a network request to the specified URL, using the specified method (if applicable).
+	The response is reported via the a_ResponseCallback callback, in a single call.
+	The metadata about the response (HTTP headers) are reported via a_InfoCallback before the a_ResponseCallback call.
+	If there is an asynchronous error, it is reported in via the a_ErrorCallback.
+	If there is an immediate error (misformatted URL etc.), the function returns false and an error message.
+	a_Headers contains additional headers to use for the request.
+	a_Body specifies optional body to include with the request, if applicable.
+	a_Options contains various options for the request that govern the request behavior, but aren't sent to the server,
+	such as the proxy server, whether to follow redirects, and client certificate for TLS. */
+	static std::pair<bool, AString> Request(
+		const AString & a_Method,
+		const AString & a_URL,
+		cCallbacks & a_Callbacks,
+		AStringMap && a_Headers,
+		AString && a_Body,
+		AStringMap && a_Options
+	);
+
+	/** Alias for Request("GET", ...) */
+	static std::pair<bool, AString> Get(
+		const AString & a_URL,
+		cCallbacks & a_Callbacks,
+		AStringMap a_Headers = AStringMap(),
+		AString a_Body = AString(),
+		AStringMap a_Options = AStringMap()
+	);
+
+	/** Alias for Request("POST", ...) */
+	static std::pair<bool, AString> Post(
+		const AString & a_URL,
+		cCallbacks & a_Callbacks,
+		AStringMap && a_Headers,
+		AString && a_Body,
+		AStringMap && a_Options
+	);
+
+	/** Alias for Request("PUT", ...) */
+	static std::pair<bool, AString> Put(
+		const AString & a_URL,
+		cCallbacks & a_Callbacks,
+		AStringMap && a_Headers,
+		AString && a_Body,
+		AStringMap && a_Options
+	);
+};
+
+
+
+