ARI - implement allowMultiple for parameters

Swagger allows parameters to be specified as 'allowMultiple', meaning
that the parameter may be specified as a comma separated list of
values.

I had written some of the API docs using that, but promptly forgot
about implementing it. This patch finally fills in that gap.

The codegen template was updated to represent 'allowMultiple' fields
as array/size fields in the _args structs. It also parses the comma
separated list using ast_app_separate_args(), so quoted strings in the
argument will be handled properly.

Review: https://reviewboard.asterisk.org/r/2698/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@396122 65c4cc65-6c06-0410-ace0-fbb531ad65f3

rest-api-templates/ari_resource.h.mustache

@@ -43,10 +43,22 @@
 /*! \brief Argument struct for ast_ari_{{c_nickname}}() */
 struct ast_{{c_nickname}}_args {
 {{#parameters}}
+{{#description}}
+{{/description}}
+{{^allow_multiple}}
 {{#description}}
 	/*! \brief {{{description}}} */
 {{/description}}
 	{{c_data_type}}{{c_space}}{{c_name}};
+{{/allow_multiple}}
+{{#allow_multiple}}
+	/*! \brief Array of {{{description}}} */
+	{{c_data_type}}{{c_space}}*{{c_name}};
+	/*! \brief Length of {{c_name}} array. */
+	size_t {{c_name}}_count;
+	/*! \brief Parsing context for {{c_name}}. */
+	char *{{c_name}}_parse;
+{{/allow_multiple}}
 {{/parameters}}
 };
 {{#is_req}}

rest-api-templates/param_cleanup.mustache

@@ -0,0 +1,26 @@
+{{!
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013, Digium, Inc.
+ *
+ * David M. Lee, II <dlee@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+}}
+{{!
+ * Snippet for cleaning up an _args struct.
+}}
+{{#query_parameters}}
+{{#allow_multiple}}
+	ast_free(args.{{c_name}}_parse);
+	ast_free(args.{{c_name}});
+{{/allow_multiple}}
+{{/query_parameters}}

rest-api-templates/param_parsing.mustache

@@ -18,15 +18,48 @@
 {{!
  * Snippet for decoding parameters into an _args struct.
 }}
-	struct ast_{{c_nickname}}_args args = {};
-{{#has_parameters}}
-	struct ast_variable *i;
-
 {{#has_query_parameters}}
 	for (i = get_params; i; i = i->next) {
 {{#query_parameters}}
 		if (strcmp(i->name, "{{name}}") == 0) {
+{{^allow_multiple}}
 			args.{{c_name}} = {{c_convert}}(i->value);
+{{/allow_multiple}}
+{{#allow_multiple}}
+			/* Parse comma separated list */
+			char *vals[MAX_VALS];
+			size_t j;
+
+			args.{{c_name}}_parse = ast_strdup(i->value);
+			if (!args.{{c_name}}_parse) {
+				ast_ari_response_alloc_failed(response);
+				goto fin;
+			}
+
+			args.{{c_name}}_count = ast_app_separate_args(
+				args.{{c_name}}_parse, ',', vals, ARRAY_LEN(vals));
+			if (args.{{c_name}}_count == 0) {
+				ast_ari_response_alloc_failed(response);
+				goto fin;
+			}
+
+			if (args.{{c_name}}_count >= MAX_VALS) {
+				ast_ari_response_error(response, 400,
+					"Bad Request",
+					"Too many values for {{c_name}}");
+				goto fin;
+			}
+
+			args.{{c_name}} = ast_malloc(sizeof(*args.{{c_name}}) * args.{{c_name}}_count);
+			if (!args.{{c_name}}) {
+				ast_ari_response_alloc_failed(response);
+				goto fin;
+			}
+
+			for (j = 0; j < args.{{c_name}}_count; ++j) {
+				args.{{c_name}}[j] = {{c_convert}}(vals[j]);
+			}
+{{/allow_multiple}}
 		} else
 {{/query_parameters}}
 		{}
@@ -42,4 +75,3 @@
 		{}
 	}
 {{/has_path_parameters}}
-{{/has_parameters}}

rest-api-templates/res_ari_resource.c.mustache

@@ -46,6 +46,7 @@
 
 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 
+#include "asterisk/app.h"
 #include "asterisk/module.h"
 #include "asterisk/stasis_app.h"
 #include "ari/resource_{{name}}.h"
@@ -53,6 +54,8 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "ari/ari_model_validators.h"
 #endif
 
+#define MAX_VALS 128
+
 {{#apis}}
 {{#operations}}
 {{#is_req}}
@@ -67,6 +70,10 @@ static void ast_ari_{{c_nickname}}_cb(
 	struct ast_variable *get_params, struct ast_variable *path_vars,
 	struct ast_variable *headers, struct ast_ari_response *response)
 {
+	struct ast_{{c_nickname}}_args args = {};
+{{#has_parameters}}
+	struct ast_variable *i;
+{{/has_parameters}}
 #if defined(AST_DEVMODE)
 	int is_valid;
 	int code;
@@ -112,12 +119,21 @@ static void ast_ari_{{c_nickname}}_cb(
 			"Internal Server Error", "Response validation failed");
 	}
 #endif /* AST_DEVMODE */
+
+fin: __attribute__((unused))
+{{> param_cleanup}}
+	return;
 }
 {{/is_req}}
 {{#is_websocket}}
 static void ast_ari_{{c_nickname}}_ws_cb(struct ast_websocket *ws_session,
 	struct ast_variable *get_params, struct ast_variable *headers)
 {
+	struct ast_{{c_nickname}}_args args = {};
+{{#has_parameters}}
+	RAII_VAR(struct ast_ari_response *, response, NULL, ast_free);
+	struct ast_variable *i;
+{{/has_parameters}}
 	RAII_VAR(struct ast_websocket *, s, ws_session, ast_websocket_unref);
 	RAII_VAR(struct ast_ari_websocket_session *, session, NULL, ao2_cleanup);
 {{#has_path_parameters}}
@@ -126,7 +142,15 @@ static void ast_ari_{{c_nickname}}_ws_cb(struct ast_websocket *ws_session,
 	 * just punt. */
 	struct ast_variable *path_vars = NULL;
 {{/has_path_parameters}}
-{{> param_parsing}}
+
+{{#has_parameters}}
+	response = ast_calloc(1, sizeof(*response));
+	if (!response) {
+		ast_log(LOG_ERROR, "Failed to create response.\n");
+		goto fin;
+	}
+{{/has_parameters}}
+
 #if defined(AST_DEVMODE)
 	session = ast_ari_websocket_session_create(ws_session,
 		ast_ari_validate_{{response_class.c_name}}_fn());
@@ -135,9 +159,31 @@ static void ast_ari_{{c_nickname}}_ws_cb(struct ast_websocket *ws_session,
 #endif
 	if (!session) {
 		ast_log(LOG_ERROR, "Failed to create ARI session\n");
-		return;
+		goto fin;
 	}
+
+{{> param_parsing}}
+
 	ast_ari_websocket_{{c_nickname}}(session, headers, &args);
+
+fin: __attribute__((unused))
+	if (response && response->response_code != 0) {
+		/* Param parsing failure */
+		/* TODO - ideally, this would return the error code to the
+		 * HTTP client; but we've already done the WebSocket
+		 * negotiation. Param parsing should happen earlier, but we
+		 * need a way to pass it through the WebSocket code to the
+		 * callback */
+		RAII_VAR(char *, msg, NULL, ast_free);
+		if (response->message) {
+			msg = ast_json_dump_string(response->message);
+		} else {
+			msg = ast_strdup("?");
+		}
+		ast_websocket_write(ws_session, AST_WEBSOCKET_OPCODE_TEXT, msg,
+			strlen(msg));
+	}
+{{> param_cleanup}}
 }
 {{/is_websocket}}
 {{/operations}}