docs(authentication): use mo:core/CallerAttributes for the Motoko backend example#207
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marc0olo merged 1 commit intodfinity:mainfrom May 6, 2026
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The Motoko side now uses CallerAttributes.getAttributes<system>() from mo:core (>= 2.5.0). The wrapper bakes in the trusted-signer check via the canister's trusted_attribute_signers env var, so the example no longer hardcodes the II principal in code: it moves to icp.yaml as deploy-time config. Notable changes: - Drops the mo:prim import on the Motoko path. The wrapper handles the caller-info primitive calls and the signer comparison. - Splits the prose intro into a per-language list, since the Rust path is unchanged (no ic-cdk wrapper for the trusted-signer check yet). - Adds an icp.yaml settings.environment_variables snippet showing how to declare trusted_attribute_signers. - Updates the "common mistakes" bullet to describe both paths.
marc0olo
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May 6, 2026
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Summary
Companion to dfinity/icskills#182. Updates the Motoko backend example on the Internet Identity guide to use
mo:core/CallerAttributes(motoko-core v2.5.0+) instead of the manualPrim.callerInfoSigner/Prim.callerInfoDatadance.CallerAttributes.getAttributes<system>() : ?Blobreturns the bundle and traps when the signer isn't listed in the canister'strusted_attribute_signersenv var. The hardcoded II principal moves out of code and into deploy config.mo:primimport on the Motoko path (the wrapper handles primitives + signer comparison).icp.yamlsettings.environment_variablessnippet for declaringtrusted_attribute_signers.msg_caller_info_signer()check, no CDK wrapper yet) stays distinct from Motoko.npm run buildpasses; no new agent-docs warnings on the affected file.Sync recommendation
informed by caffeinelabs/motoko-core (
src/CallerAttributes.mo); dfinity/icp-cli (docs/reference/canister-settings.md#environment_variables); dfinity/icskills (skills/internet-identity/SKILL.mdcompanion PR #182)