Doorkeeper integration

1 files changed, 41 insertions, 0 deletions

diff --git a/app/services/oauth2/access_token_validation_service.rb b/app/services/oauth2/access_token_validation_service.rb
new file mode 100644
index 00000000000..95283489753
--- /dev/null
+++ b/app/services/oauth2/access_token_validation_service.rb
@@ -0,0 +1,41 @@
+module Oauth2::AccessTokenValidationService
+  # Results:
+  VALID = :valid
+  EXPIRED = :expired
+  REVOKED = :revoked
+  INSUFFICIENT_SCOPE = :insufficient_scope
+
+  class << self
+    def validate(token, scopes: [])
+      if token.expired?
+        return EXPIRED
+
+      elsif token.revoked?
+        return REVOKED
+
+      elsif !self.sufficent_scope?(token, scopes)
+        return INSUFFICIENT_SCOPE
+
+      else
+        return VALID
+      end
+    end
+
+    protected
+    # True if the token's scope is a superset of required scopes,
+    # or the required scopes is empty.
+    def sufficent_scope?(token, scopes)
+      if scopes.blank?
+        # if no any scopes required, the scopes of token is sufficient.
+        return true
+      else
+        # If there are scopes required, then check whether
+        # the set of authorized scopes is a superset of the set of required scopes
+        required_scopes = Set.new(scopes)
+        authorized_scopes = Set.new(token.scopes)
+
+        return authorized_scopes >= required_scopes
+      end
+    end
+  end
+end
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