add tagging support to events

moto/utilities/tagging_service.py

@@ -0,0 +1,56 @@
+class TaggingService:
+    def __init__(self, tagName="Tags", keyName="Key", valueName="Value"):
+        self.tagName = tagName
+        self.keyName = keyName
+        self.valueName = valueName
+        self.tags = {}
+
+    def list_tags_for_resource(self, arn):
+        result = []
+        if arn in self.tags:
+            for k, v in self.tags[arn].items():
+                result.append({self.keyName: k, self.valueName: v})
+        return {self.tagName: result}
+
+    def tag_resource(self, arn, tags):
+        if arn not in self.tags:
+            self.tags[arn] = {}
+        for t in tags:
+            if self.valueName in t:
+                self.tags[arn][t[self.keyName]] = t[self.valueName]
+            else:
+                self.tags[arn][t[self.keyName]] = None
+
+    def untag_resource_using_names(self, arn, tag_names):
+        for name in tag_names:
+            if name in self.tags.get(arn, {}):
+                del self.tags[arn][name]
+
+    def untag_resource_using_tags(self, arn, tags):
+        m = self.tags.get(arn, {})
+        for t in tags:
+            if self.keyName in t:
+                if t[self.keyName] in m:
+                    if self.valueName in t:
+                        if m[t[self.keyName]] != t[self.valueName]:
+                            continue
+                    # If both key and value are provided, match both before deletion
+                    del m[t[self.keyName]]
+
+    def extract_tag_names(self, tags):
+        results = []
+        if len(tags) == 0:
+            return results
+        for tag in tags:
+            if self.keyName in tag:
+                results.append(tag[self.keyName])
+        return results
+
+    def flatten_tag_list(self, tags):
+        result = {}
+        for t in tags:
+            if self.valueName in t:
+                result[t[self.keyName]] = t[self.valueName]
+            else:
+                result[t[self.keyName]] = None
+        return result