add code for kerberos strategy with user token as input(straight) & m…

include/aws/http/proxy_strategy.h

@@ -18,6 +18,29 @@ struct aws_http_header;
 struct aws_http_proxy_strategy;
 struct aws_http_proxy_strategy_factory;
 
+/*SA-Added Start*/
+
+/*enum defination for callback state*/
+enum proxy_strategy_callback_state {
+    AWS_KERB_TOKEN,
+    AWS_NTLM_CRED,
+    AWS_NTLM_RESP,
+};
+
+/**
+ * User-supplied callback function that send data to user 
+ *(example NTLM challenge received from proxy server)
+ */
+typedef void (*aws_http_proxy_send_user_data_callback_fn)(size_t data_length, uint8_t *data, void *userdata);
+
+/**
+ * User-supplied callback function that gets user data depending on callback state
+ *(example NTLM credentials/response)
+ */
+typedef char* (*aws_http_proxy_get_user_data_callback_fn)(int callback_state, void *userdata);
+
+/*SA-Added End*/
+
 /**
  * Proxy strategy logic must call this function to indicate an unsuccessful outcome
  */
@@ -185,12 +208,37 @@ struct aws_http_proxy_strategy_factory_tunneling_adaptive_test_options {
  */
 struct aws_http_proxy_strategy_factory_tunneling_kerberos_options {
     bool placeholder;
+    aws_http_proxy_send_user_data_callback_fn func_1;
+    aws_http_proxy_get_user_data_callback_fn func_2;
+    void *userData;
 };
 
 struct aws_http_proxy_strategy_factory_tunneling_adaptive_kerberos_options {
     struct aws_http_proxy_strategy_factory_tunneling_kerberos_options kerberos_options;
+ };
+
+/*SA-Added Start*/
+ struct aws_http_proxy_strategy_factory_kerberos_auth_config {
+
+     /* type of proxy connection being established, must be forwarding or tunnel */
+     enum aws_http_proxy_connection_type proxy_connection_type;
+
+     /* user token to use in kerberos authentication which is base64 encoded and provided by user*/
+     struct aws_byte_cursor user_token;
+ };
+
+struct aws_http_proxy_strategy_factory_tunneling_ntlm_options {
+    bool placeholder;
+    aws_http_proxy_send_user_data_callback_fn func_1;
+    aws_http_proxy_get_user_data_callback_fn func_2;
+    void *userData;
 };
 
+struct aws_http_proxy_strategy_factory_tunneling_adaptive_ntlm_options {
+    struct aws_http_proxy_strategy_factory_tunneling_ntlm_options ntlm_options;
+};
+
+/*SA-Added End*/
 AWS_EXTERN_C_BEGIN
 
 /**
@@ -302,16 +350,65 @@ struct aws_http_proxy_strategy_factory *aws_http_proxy_strategy_factory_new_tunn
  * This is an experimental API.
  *
  * Constructor for a WIP adaptive tunneling proxy strategy.  This strategy attempts a vanilla CONNECT and if that
- * fails it attempts a kerberos-oriented CONNECT (if applicable).
+ * fails it attempts a kerberos-oriented CONNECT request followed by a NTLM-oriented CONNECT request (if applicable).
+ *
+ * @param allocator memory allocator to use
+ * @param config configuration options for the strategy factory
+ * @return a new proxy strategy factory if successfully constructed, otherwise NULL
+ */
+AWS_HTTP_API
+struct aws_http_proxy_strategy_factory *aws_http_proxy_strategy_factory_new_tunneling_adaptive_kerberos_ntlm(
+    struct aws_allocator *allocator,
+    struct aws_http_proxy_strategy_factory_tunneling_adaptive_kerberos_options *kerberos_config,
+    struct aws_http_proxy_strategy_factory_tunneling_adaptive_ntlm_options *ntlm_config);
+
+/*SA-Added Start*/
+
+/**
+ * A constructor for a proxy strategy factory that performs kerberos authentication by adding the appropriate
+ * header and header value to requests or CONNECT requests.
+ *
+ * @param allocator memory allocator to use
+ * @param config kerberos authentication configuration info
+ * @return a new proxy strategy factory if successfully constructed, otherwise NULL
+ */
+AWS_HTTP_API
+struct aws_http_proxy_strategy_factory *aws_http_proxy_strategy_factory_new_kerberos_auth(
+    struct aws_allocator *allocator,
+    struct aws_http_proxy_strategy_factory_kerberos_auth_config *config);
+
+/**
+ * This is an experimental API.
+ *
+ * Constructor for a WIP adaptive tunneling NTLM proxy strategy.  This strategy attempts a vanilla CONNECT and if that
+ * fails it attempts a ntlm-oriented CONNECT (if applicable).
  *
  * @param allocator memory allocator to use
  * @param config configuration options for the strategy factory
  * @return a new proxy strategy factory if successfully constructed, otherwise NULL
  */
 AWS_HTTP_API
-struct aws_http_proxy_strategy_factory *aws_http_proxy_strategy_factory_new_tunneling_adaptive_kerberos(
+struct aws_http_proxy_strategy_factory *aws_http_proxy_strategy_factory_new_tunneling_adaptive_ntlm(
     struct aws_allocator *allocator,
-    struct aws_http_proxy_strategy_factory_tunneling_adaptive_kerberos_options *config);
+    struct aws_http_proxy_strategy_factory_tunneling_adaptive_ntlm_options *config);
+
+/**
+ * This is an experimental API.
+ *
+ * Constructor for callback functions
+ *
+ * @param callback function for sending user data to user, example - NTLM chalenge 
+ * @param callback function for getting user data, example - NTLM Cred,NTLM Response, Kerberos Token
+ * @return NULL
+ */
+/*
+AWS_HTTP_API
+int aws_http_proxy_connection_configure_callback(
+    aws_http_proxy_send_user_data_callback_fn func_1,
+    aws_http_proxy_get_user_data_callback_fn func_2,
+    void *userdata);
+*/
+/*SA-Added End*/
 
 AWS_EXTERN_C_END