binding: identity: read vin and user token from nfc tag

Original idea and rework from Scott Murray for CES 2019 (funky flounder).
This is a simplified version to match agl-service-nfc which in master is
not providing all tag record fields but just the content value.
To test an nfc tag must be programmed with a text record with value
vin:uid.

Bug-AGL: SPEC-2158

Change-Id: I12fb8e6b3f9e8259bc3c13829e44f7f0e0159f0a
Signed-off-by: Raquel Medina <raquel.medina@konsulko.com>
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
(cherry picked from commit b2676e6e8aae3c6002e9ed3f2c0fa68176051d96)

1 files changed, 45 insertions, 12 deletions

diff --git a/src/agl-identity-binding.c b/src/agl-identity-binding.c
index f246ea9..bac7b90 100644
--- a/src/agl-identity-binding.c
+++ b/src/agl-identity-binding.c
@@ -234,6 +234,41 @@ out:
 	return ret;
 }
 
+static void parse_nfc_tag_record(struct json_object *object)
+{
+	const char *tag_uid;
+	const char *tag_vin;
+	const char *value;
+	char *tmp;
+
+	value = json_object_get_string(object);
+	if (!value) {
+		AFB_API_ERROR(this_api, "ignore tag - empty content value");
+		goto out;
+	}
+
+	tag_vin = strtok_r(value,":", &tmp);
+	if (!tag_vin) {
+		AFB_API_ERROR(this_api, "ignore tag - missing vin value");
+		goto out;
+	}
+
+	tag_uid = strtok_r(NULL, ":", &tmp);
+	if (!tag_uid) {
+		AFB_API_ERROR(this_api, "ignore tag - missing uid value");
+		goto out;
+	}
+
+	if (!strcmp(tag_vin, vin)) {
+		AFB_API_NOTICE(this_api, "tag record: vin=%s, key=%s", tag_vin, tag_uid);
+		agl_forgerock_download_request(vin, "nfc", tag_uid);
+	}
+
+out:
+	return;
+
+}
+
 static void on_nfc_target_add(struct json_object *object)
 {
 	struct json_object *json_status;
@@ -246,6 +281,10 @@ static void on_nfc_target_add(struct json_object *object)
 		goto out;
 	}
 
+	AFB_API_DEBUG(this_api,
+		      "nfc/presence debug: %s",
+			      json_object_to_json_string(object));
+
 	if (!json_object_object_get_ex(object, "status", &json_status)) {
 		AFB_API_ERROR(this_api, "nfc/presence missing status");
 		goto out;
@@ -256,19 +295,13 @@ static void on_nfc_target_add(struct json_object *object)
 		goto out;
 	}
 
-	if (json_object_object_get_ex(object, "uid", &json_uid))
-	{
-		uid = json_object_get_string(json_uid);
-		AFB_API_NOTICE(this_api,
-			       "nfc tag detected, call forgerock with vincode=%s and key=%s",
-			       vin ? vin : default_vin, uid);
-
-		agl_forgerock_download_request(vin ? vin : default_vin, "nfc", uid);
+	if (!json_object_object_get_ex(object, "uid", &json_uid)) {
+		AFB_API_ERROR(this_api, "nfc/presence missing uid");
+		goto out;
 	}
-	else
-		AFB_API_ERROR(this_api,
-			      "nfc tag detected event but no UID found: %s",
-			      json_object_to_json_string(object));
+
+	parse_nfc_tag_record(json_uid);
+
 out:
 	return;
 }