feat: "a" tag since NIP01 update (#33)

* Add a tag to filter

* Oops. wrong letter

* Add a tag to these test cases

---------

Co-authored-by: cm <c@m.com>

lib/src/filter.dart

@@ -12,6 +12,9 @@ class Filter {
   /// a list of event ids that are referenced in an "e" tag
   List<String>? e;
 
+  /// a list of event ids that are referenced in an "a" tag
+  List<String>? a;
+
   /// a list of pubkeys that are referenced in a "p" tag
   List<String>? p;
 
@@ -30,6 +33,7 @@ class Filter {
       this.authors,
       this.kinds,
       this.e,
+      this.a,
       this.p,
       this.since,
       this.until,
@@ -42,6 +46,7 @@ class Filter {
         json['authors'] == null ? null : List<String>.from(json['authors']);
     kinds = json['kinds'] == null ? null : List<int>.from(json['kinds']);
     e = json['#e'] == null ? null : List<String>.from(json['#e']);
+    a = json['#a'] == null ? null : List<String>.from(json['#a']);
     p = json['#p'] == null ? null : List<String>.from(json['#p']);
     since = json['since'];
     until = json['until'];
@@ -63,6 +68,9 @@ class Filter {
     if (e != null) {
       data['#e'] = e;
     }
+    if (a != null) {
+      data['#a'] = a;
+    }
     if (p != null) {
       data['#p'] = p;
     }

test/filter_test.dart

@@ -12,6 +12,7 @@ void main() {
       ];
       List<int> kinds = [0, 1, 2, 7];
       List<String> e = [];
+      List<String> a = [];
       List<String> p = [];
       int since = 1672477960;
       int until = 1674063680;
@@ -22,6 +23,7 @@ void main() {
         authors: authors,
         kinds: kinds,
         e: e,
+        a: a,
         p: p,
         since: since,
         until: until,
@@ -32,6 +34,7 @@ void main() {
       expect(filter.authors, authors);
       expect(filter.kinds, kinds);
       expect(filter.e, e);
+      expect(filter.e, e);
       expect(filter.p, p);
       expect(filter.since, since);
       expect(filter.until, until);
@@ -48,6 +51,7 @@ void main() {
         ],
         "kinds": [0, 1, 2, 7],
         "#e": [],
+        "#a": [],
         "#p": [],
         "since": 1672477960,
         "until": 1674063680,

test/request_test.dart

@@ -14,6 +14,7 @@ void main() {
         ],
         kinds: [0, 1, 2, 7],
         e: [],
+        a: [],
         p: [],
         since: 1672477960,
         until: 1674063680,
@@ -27,6 +28,7 @@ void main() {
       expect(req.filters[0].authors, myFilter.authors);
       expect(req.filters[0].kinds, myFilter.kinds);
       expect(req.filters[0].e, myFilter.e);
+      expect(req.filters[0].a, myFilter.a);
       expect(req.filters[0].p, myFilter.p);
       expect(req.filters[0].kinds, myFilter.kinds);
       expect(req.filters[0].since, myFilter.since);
@@ -36,7 +38,7 @@ void main() {
 
     test('Request.serialize', () {
       String serialized =
-          '["REQ","733209259899167",{"ids":["047663d895d56aefa3f528935c7ce7dc8939eb721a0ec76ef2e558a8257955d2"],"authors":["0ba0206887bd61579bf65ec09d7806bea32c64be1cf2c978cf031a811cd238db"],"kinds":[0,1,2,7],"#e":[],"#p":[],"since":1672477960,"until":1674063680,"limit":450},{"kinds":[0,1,2,7],"since":1673980547,"limit":450}]';
+          '["REQ","733209259899167",{"ids":["047663d895d56aefa3f528935c7ce7dc8939eb721a0ec76ef2e558a8257955d2"],"authors":["0ba0206887bd61579bf65ec09d7806bea32c64be1cf2c978cf031a811cd238db"],"kinds":[0,1,2,7],"#e":[],"#a":[],"#p":[],"since":1672477960,"until":1674063680,"limit":450},{"kinds":[0,1,2,7],"since":1673980547,"limit":450}]';
       var json = [
         "REQ",
         "733209259899167",
@@ -49,6 +51,7 @@ void main() {
           ],
           "kinds": [0, 1, 2, 7],
           "#e": [],
+          "#a": [],
           "#p": [],
           "since": 1672477960,
           "until": 1674063680,
@@ -77,6 +80,7 @@ void main() {
           ],
           "kinds": [0, 1, 2, 7],
           "#e": [],
+          "#a": [],
           "#p": [],
           "since": 1672477960,
           "until": 1674063680,
@@ -95,6 +99,7 @@ void main() {
       expect(req.filters[0].authors,
           ["0ba0206887bd61579bf65ec09d7806bea32c64be1cf2c978cf031a811cd238db"]);
       expect(req.filters[0].e, []);
+      expect(req.filters[0].a, []);
       expect(req.filters[0].p, []);
       expect(req.filters[0].kinds, [0, 1, 2, 7]);
       expect(req.filters[0].since, 1672477960);