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encoding/openapi: detect cycles when expanding references
Fixes #915 Change-Id: Ie781ee316e8675da66f7ca3bea4c841acaaa8a5b Reviewed-on: https://cue-review.googlesource.com/c/cue/+/9603 Reviewed-by: CUE cueckoo <cueckoo@gmail.com> Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| // Copyright 2021 CUE Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package openapi | ||
|
|
||
| import ( | ||
| "cuelang.org/go/cue" | ||
| "cuelang.org/go/cue/errors" | ||
| "cuelang.org/go/cue/token" | ||
| "cuelang.org/go/internal/core/dep" | ||
| "cuelang.org/go/internal/core/eval" | ||
| internalvalue "cuelang.org/go/internal/value" | ||
| ) | ||
|
|
||
| func (b *builder) pushNode(v cue.Value) { | ||
| _, n := internalvalue.ToInternal(v) | ||
| b.ctx.cycleNodes = append(b.ctx.cycleNodes, n) | ||
| } | ||
|
|
||
| func (b *builder) popNode() { | ||
| b.ctx.cycleNodes = b.ctx.cycleNodes[:len(b.ctx.cycleNodes)-1] | ||
| } | ||
|
|
||
| func (b *builder) checkCycle(v cue.Value) bool { | ||
| if !b.ctx.expandRefs { | ||
| return true | ||
| } | ||
| r, n := internalvalue.ToInternal(v) | ||
| ctx := eval.NewContext(r, n) | ||
|
|
||
| err := dep.Visit(ctx, n, func(d dep.Dependency) error { | ||
| for _, m := range b.ctx.cycleNodes { | ||
| if m == d.Node { | ||
| var p token.Pos | ||
| if src := d.Node.Source(); src != nil { | ||
| p = src.Pos() | ||
| } | ||
| err := errors.Newf(p, | ||
| "cycle in reference at %v: cyclic structures not allowed when reference expansion is requested", v.Path()) | ||
| b.ctx.errs = errors.Append(b.ctx.errs, err) | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| }) | ||
|
|
||
| return err == nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| // Issue #915 | ||
| #Foo: [string]: #Foo |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| { | ||
| "openapi": "3.0.0", | ||
| "info": { | ||
| "title": "test", | ||
| "version": "v1" | ||
| }, | ||
| "paths": {}, | ||
| "components": { | ||
| "schemas": { | ||
| "Foo": { | ||
| "description": "Issue #915", | ||
| "type": "object", | ||
| "additionalProperties": { | ||
| "$ref": "#/components/schemas/Foo" | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |