1 files changed, 32 insertions, 0 deletions
diff --git a/app/services/access_token_validation_service.rb b/app/services/access_token_validation_service.rb
new file mode 100644
index 00000000000..ddaaed90e5b
--- /dev/null
+++ b/app/services/access_token_validation_service.rb
@@ -0,0 +1,32 @@
+AccessTokenValidationService = Struct.new(:token) do
+  # Results:
+  VALID = :valid
+  EXPIRED = :expired
+  REVOKED = :revoked
+  INSUFFICIENT_SCOPE = :insufficient_scope
+
+  def validate(scopes: [])
+    if token.expired?
+      return EXPIRED
+
+    elsif token.revoked?
+      return REVOKED
+
+    elsif !self.include_any_scope?(scopes)
+      return INSUFFICIENT_SCOPE
+
+    else
+      return VALID
+    end
+  end
+
+  # True if the token's scope contains any of the passed scopes.
+  def include_any_scope?(scopes)
+    if scopes.blank?
+      true
+    else
+      # Check whether the token is allowed access to any of the required scopes.
+      Set.new(scopes).intersection(Set.new(token.scopes)).present?
+    end
+  end
+end