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91 lines
2.7 KiB
Go
91 lines
2.7 KiB
Go
// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
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// SPDX-License-Identifier: MIT
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package v3
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import (
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"crypto/sha256"
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"fmt"
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"github.com/pb33f/libopenapi/datamodel/low"
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"github.com/pb33f/libopenapi/index"
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"gopkg.in/yaml.v3"
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"sort"
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"strings"
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)
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// Callback represents a low-level Callback object for OpenAPI 3+.
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//
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// A map of possible out-of band callbacks related to the parent operation. Each value in the map is a
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// PathItem Object that describes a set of requests that may be initiated by the API provider and the expected
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// responses. The key value used to identify the path item object is an expression, evaluated at runtime,
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// that identifies a URL to use for the callback operation.
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// - https://spec.openapis.org/oas/v3.1.0#callback-object
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type Callback struct {
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Expression low.ValueReference[map[low.KeyReference[string]]low.ValueReference[*PathItem]]
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Extensions map[low.KeyReference[string]]low.ValueReference[any]
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}
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// FindExpression will locate a string expression and return a ValueReference containing the located PathItem
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func (cb *Callback) FindExpression(exp string) *low.ValueReference[*PathItem] {
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return low.FindItemInMap[*PathItem](exp, cb.Expression.Value)
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}
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// Build will extract extensions, expressions and PathItem objects for Callback
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func (cb *Callback) Build(root *yaml.Node, idx *index.SpecIndex) error {
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cb.Extensions = low.ExtractExtensions(root)
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// handle callback
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var currentCB *yaml.Node
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callbacks := make(map[low.KeyReference[string]]low.ValueReference[*PathItem])
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for i, callbackNode := range root.Content {
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if i%2 == 0 {
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currentCB = callbackNode
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continue
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}
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callback, eErr := low.ExtractObjectRaw[*PathItem](callbackNode, idx)
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if eErr != nil {
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return eErr
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}
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callbacks[low.KeyReference[string]{
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Value: currentCB.Value,
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KeyNode: currentCB,
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}] = low.ValueReference[*PathItem]{
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Value: callback,
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ValueNode: callbackNode,
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}
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}
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if len(callbacks) > 0 {
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cb.Expression = low.ValueReference[map[low.KeyReference[string]]low.ValueReference[*PathItem]]{
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Value: callbacks,
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ValueNode: root,
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}
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}
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return nil
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}
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// Hash will return a consistent SHA256 Hash of the Callback object
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func (cb *Callback) Hash() [32]byte {
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var f []string
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var keys []string
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keys = make([]string, len(cb.Expression.Value))
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z := 0
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for k := range cb.Expression.Value {
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keys[z] = low.GenerateHashString(cb.Expression.Value[k].Value)
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z++
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}
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sort.Strings(keys)
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f = append(f, keys...)
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keys = make([]string, len(cb.Extensions))
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z = 0
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for k := range cb.Extensions {
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keys[z] = fmt.Sprintf("%s-%x", k.Value, sha256.Sum256([]byte(fmt.Sprint(cb.Extensions[k].Value))))
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z++
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}
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sort.Strings(keys)
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f = append(f, keys...)
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return sha256.Sum256([]byte(strings.Join(f, "|")))
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}
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