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Common Expression Language The Common Expression Language (CEL) is a non-Turing complete language designed for simplicity, speed, safety, and portability. CEL's C-like syntax looks nearly identical to equivalent expressions in C++, Go, Java, and TypeScript. // Check whether a resource name starts with a group name. resource.name.startsWith("/groups/" + auth.claims.group) // Determine whether the request is in the permitted time window. request.time - resource.age duration("24h") // Check whether all resource names in a list match a given filter. auth.claims.email_verified && resources.all(r...

Common Expression Language The Common Expression Language (CEL) implements common semantics for expression evaluation, enabling different applications to more easily interoperate. Key Applications Security policy: organization have complex infrastructure and need common tooling to reason about the system as a whole Protocols: expressions are a useful data type and require interoperability across programming languages and platforms. Guiding philosophy: Keep it small & fast. CEL evaluates in linear time, is mutation free, and not Turing-complete. This limitation is a feature of the language des...