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allow anonymous objects in secureResolve

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Hazelnoot 2025-05-26 11:33:53 -04:00
parent 02787f75ef
commit facedd3646
1 changed files with 13 additions and 3 deletions
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16
packages/backend/src/core/activitypub/ApResolverService.ts
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@ -151,16 +151,26 @@ export class Resolver {
* Securely resolves an AP object or URL that has been sent from another instance.
* An input object is trusted if and only if its ID matches the authority of sentFromUri.
* In all other cases, the object is re-fetched from remote by input string or object ID.
* @param input The input object or URL to resolve
* @param sentFromUri The URL where this object originated. This MUST be accurate - all security checks depend on this value!
* @param allowAnonymous If true, anonymous objects are allowed and will have their ID set to sentFromUri. If false (default) then anonymous objects will be rejected with an error.
*/
@bindThis
public async secureResolve(input: ApObject, sentFromUri: string): Promise<IObjectWithId> {
public async secureResolve(input: ApObject, sentFromUri: string, allowAnonymous?: boolean): Promise<IObjectWithId> {
// Unpack arrays to get the value element.
const value = fromTuple(input);
if (value == null) {
throw new IdentifiableError('20058164-9de1-4573-8715-425753a21c1d', 'Cannot resolve null input');
}
// This will throw if the input has no ID, which is good because we can't verify an anonymous object anyway.
// If anonymous input is allowed, then any object is automatically valid if we set the ID.
// We can short-circuit here and avoid un-necessary checks.
if (allowAnonymous && typeof(value) === 'object' && value.id == null) {
value.id = sentFromUri;
return value as IObjectWithId;
}
// This ensures the input has a string ID, protecting against type confusion and rejecting anonymous objects.
const id = getApId(value);
// Check if we can use the provided object as-is.
@ -171,7 +181,7 @@ export class Resolver {
}
// If the checks didn't pass, then we must fetch the object and use that.
return await this.resolve(id);
return await this.resolve(id, allowAnonymous);
}
public async resolve(value: string | [string], allowAnonymous?: boolean): Promise<IObjectWithId>;