lightningd: add description field to offer related responces

Changelog-Added: Expose decoded offer description in `offer` and `listoffers` RPC responses.

Author: erdoganishe

lightningd/offer.c

@@ -25,6 +25,26 @@ static void json_populate_offer(struct json_stream *response,
 		json_add_escaped_string(response, "label", label);
 }
 
+static const char *offer_description_from_b12(const tal_t *ctx,
+					struct lightningd *ld,
+					const char *b12)
+{
+    struct tlv_offer *offer;
+    char *fail;
+
+	offer = offer_decode(ctx, b12, strlen(b12),
+                         NULL, NULL, &fail);
+    if (!offer) {
+        log_debug(ld->log, "Failed to decode BOLT12: %s", fail);
+        return NULL;
+    }
+
+    if (!offer->offer_description)
+        return NULL;
+
+    return offer->offer_description;
+}
+
 static struct command_result *param_b12_offer(struct command *cmd,
 					      const char *name,
 					      const char *buffer,
@@ -134,6 +154,7 @@ static struct command_result *json_listoffers(struct command *cmd,
 	struct json_stream *response;
 	struct wallet *wallet = cmd->ld->wallet;
 	const char *b12;
+	const char *description;
 	const struct json_escape *label;
 	bool *active_only;
 	enum offer_status status;
@@ -154,6 +175,9 @@ static struct command_result *json_listoffers(struct command *cmd,
 			json_populate_offer(response,
 					    offer_id, b12,
 					    label, status);
+			description = offer_description_from_b12(tmpctx, cmd->ld, b12);
+			if (description)
+				json_add_stringn(response, "description", description, tal_bytelen(description));
 			json_object_end(response);
 		}
 	} else {
@@ -170,6 +194,9 @@ static struct command_result *json_listoffers(struct command *cmd,
 				json_populate_offer(response,
 						    &id, b12,
 						    label, status);
+				description = offer_description_from_b12(tmpctx, cmd->ld, b12);
+				if (description)
+					json_add_stringn(response, "description", description, tal_bytelen(description));
 				json_object_end(response);
 			}
 		}
@@ -193,6 +220,7 @@ static struct command_result *json_disableoffer(struct command *cmd,
 	struct sha256 *offer_id;
 	struct wallet *wallet = cmd->ld->wallet;
 	const char *b12;
+	const char *description;
 	const struct json_escape *label;
 	enum offer_status status;
 
@@ -216,6 +244,9 @@ static struct command_result *json_disableoffer(struct command *cmd,
 
 	response = json_stream_success(cmd);
 	json_populate_offer(response, offer_id, b12, label, status);
+	description = offer_description_from_b12(tmpctx, cmd->ld, b12);
+	if (description)
+		json_add_stringn(response, "description", description, tal_bytelen(description));
 	return command_success(cmd, response);
 }
 
@@ -234,6 +265,7 @@ static struct command_result *json_enableoffer(struct command *cmd,
 	struct sha256 *offer_id;
 	struct wallet *wallet = cmd->ld->wallet;
 	const char *b12;
+	const char *description;
 	const struct json_escape *label;
 	enum offer_status status;
 
@@ -257,6 +289,9 @@ static struct command_result *json_enableoffer(struct command *cmd,
 
 	response = json_stream_success(cmd);
 	json_populate_offer(response, offer_id, b12, label, status);
+	description = offer_description_from_b12(tmpctx, cmd->ld, b12);
+	if (description)
+		json_add_stringn(response, "description", description, tal_bytelen(description));
 	return command_success(cmd, response);
 }